CN114030762B

CN114030762B - Sealing structure of packaging box, production process of sealing structure and packaging box

Info

Publication number: CN114030762B
Application number: CN202111348620.0A
Authority: CN
Inventors: 瀚森·毕
Original assignee: Hansen Hengye Beijing Commercial Co ltd
Current assignee: Hansen Hengye Beijing Commercial Co ltd
Priority date: 2021-11-15
Filing date: 2021-11-15
Publication date: 2025-09-12
Anticipated expiration: 2041-11-15
Also published as: WO2023083061A1; US20250011055A1; EP4434914A1; CN114030762A; JP2024542874A

Abstract

The invention discloses a sealing structure of a packaging box, a production process of the sealing structure and the packaging box. The sealing structure comprises a pull tab, an inner film and a sealing sheet, wherein the pull tab covers the outer side of an opening on the packaging box, the area of the pull tab is larger than the area of the opening, the sealing sheet is matched with the shape of the opening and corresponds to the position of the opening, the inner film covers the inner side of the opening, the area of the inner film is larger than the area of the opening, the pull tab can break the inner film at the opening under the action of external force to open the opening, and the sealing sheet can be embedded into the opening under the action of external force to close the opening. By arranging the sealing structure on the packing box, the opening of the packing box can be repeatedly opened and closed, the using amount of plastic is effectively reduced, the packing box is more environment-friendly, and the manufacturing cost is reduced.

Description

Sealing structure of packaging box, production process of sealing structure and packaging box

Technical Field

The invention belongs to the technical field of product packaging, and particularly relates to a sealing structure of a packaging box, a production process of the sealing structure and the packaging box.

Background

Non-carbonated liquid foods, such as drinking water, milk and yogurt, and semi-liquid foods, such as fruit juice, are widely packaged for sale in three-dimensional packaging boxes. The packaging box for liquid or semi-liquid food is usually made of a paper-based composite packaging material, and the paper-based composite packaging material is formed by compositing a paper base layer, a barrier layer (such as aluminum foil), a waterproof layer, an innermost layer and other multi-layer structures. After the production of the composite packaging material is finished, the composite packaging material is delivered to a food filling enterprise from a packaging material production enterprise, and the composite packaging material is filled in the filling enterprise to form the liquid food packaging box through a plurality of procedures such as filling, sealing, shaping and the like.

Liquid food packages are typically sealed with a disposable closure, or with a plastic package lid. The plastic packaging cover has higher production cost, can generate a large amount of plastic garbage which is difficult to degrade and brings heavy burden to the environment. The disposable seal adopted by the liquid food packaging box, such as the easy-to-open label, has the advantages of convenient opening, low cost and the like, is very suitable for liquid food packaging, especially for small-capacity liquid food packaging, but the easy-to-open label on the liquid food packaging box in the past can only realize disposable opening, can not seal the opening again after opening, can not be reused, so that the liquid food packaging box with the easy-to-open label can not be drunk immediately, and is inconvenient to carry.

Disclosure of Invention

In view of the above, the present invention discloses a sealing structure of a packaging box, a production process of the sealing structure and the packaging box, so as to overcome or at least partially solve the above problems.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

The application discloses a sealing structure of a packaging box, wherein the packaging box is made of a composite packaging material, the composite packaging material comprises a base layer, a barrier layer, a waterproof layer and an innermost layer, and the sealing structure comprises a pull tab, an inner film and a plugging sheet;

The pull tab covers the outer side of the opening on the packaging box, the area of the pull tab is larger than that of the opening, and the plugging sheet is matched with the shape of the opening and corresponds to the position of the opening;

Under the action of external force, the pull tab can break the inner film at the opening to realize opening of the opening;

the plugging sheet can be embedded into the opening under the action of external force, so that the opening is closed.

Further, the blocking sheet is positioned on the inner side surface of the pull tab, and the inner film is fixedly connected with the blocking sheet.

Further, the plugging sheet is positioned on the outer side surface of the pull tab, and the inner film is fixedly connected with the pull tab.

Further, the plugging sheet is positioned on the inner side surface of the inner membrane, and the pull tab is fixedly connected with the inner membrane.

Further, the sealing structure further comprises an outer film, the outer film is arranged on the outer side of the opening, and the pull tab is arranged on the outer side of the outer film.

Further, the area of the outer film is smaller than that of the pull tab or the length of the outer film is smaller than that of the pull tab, and the pull tab part is fixedly connected with the outer film.

Further, the plugging sheet is made of plastic, paper-plastic composite material or degradable biological material.

Further, the pull tab is a composite material comprising a barrier material and a fusible material, the barrier material is at least one of aluminum foil or barrier paper, and the fusible material is at least one selected from plastics, PLA or PBAT.

Further, the inner film is a PE film or a composite film.

Further, the edges of the plugging sheet are chamfered or provided with inclined surfaces.

Further, a plurality of arc-shaped bulges or arc-shaped grooves in the horizontal direction are arranged on the inclined plane.

Further, the thickness of the plugging sheet is 1/8-8 times of the thickness of the base layer of the composite packaging material.

Further, the thickness of the plugging sheet is 2-4 times of the thickness of the base layer of the composite packaging material.

Further, the thickness of one side of the occluding tab is less than the thickness of the other side, and the tab is pulled up from the side of the occluding tab having the lesser thickness.

Further, the sealing structure also comprises a connecting part, and the connecting part connects the composite packaging material with the pull tab or the plugging sheet.

Further, the sealing structure further comprises a connecting part, wherein the connecting part is an end part of the pull tab, and the end part of the pull tab is connected with the composite packaging material.

Further, the sealing structure also comprises a connecting part, one end of the connecting part is fixedly connected with the inner membrane or the innermost layer near the inner side of the opening, and the other end of the connecting part is fixedly connected with the sealing sheet.

Further, the blocking sheet is of a hollow structure and/or an opening is formed in the middle of the blocking sheet.

Further, the blocking sheet is recessed toward the opening side to form a recess.

Further, the recess of the blocking sheet has an opening.

The application also discloses a production process of the sealing structure of the packing box, which comprises the following steps:

s1, punching a composite packaging material to form an opening;

s2, respectively arranging an inner film and a pull tab on the inner side and the outer side of the opening, wherein the areas of the inner film and the pull tab are larger than the area of the opening;

s3, arranging a blocking sheet on the pull tab or the inner film, wherein the blocking sheet is matched with the shape of the opening and corresponds to the position of the opening;

and S4, fixedly connecting the inner film, the blocking sheet and the pull tab through a heat sealing process or an adhesive process, enabling the pull tab to break the inner film at the opening under the action of external force to open the opening, and enabling the blocking sheet to be embedded into the opening under the condition that the blocking sheet is pressed to close the opening.

Further, the production process further comprises:

An outer film is arranged outside the opening, or,

And arranging an outer film on the outer side of the composite packaging material, and punching in the area covered by the outer film to form an opening.

The application also discloses a sealing structure of the packaging box, wherein the packaging box is made of a composite packaging material, the composite packaging material comprises a base layer, a barrier layer, a waterproof layer and an innermost layer, the sealing structure comprises an inner film and a plugging sheet, and the inner film is fixedly connected with the plugging sheet;

The plugging sheet is matched with the shape of the opening and corresponds to the position of the opening, the inner film covers the inner side of the opening, and the area of the inner film is larger than that of the opening;

The plugging sheet can break the inner membrane at the opening under the action of external force to realize opening of the opening, and can be embedded into the opening under the action of external force to realize closing of the opening.

Further, the blocking sheet is recessed to the opening side to form a recess, and has a rim which is larger than the opening and parallel to the opening, and which is used for covering the outside of the opening on the package.

The application also discloses a sealing structure of a packaging box, which is made of a composite packaging material, wherein the composite packaging material comprises a base layer, a barrier layer, a waterproof layer and an innermost layer, and the sealing structure comprises an inner film and a plugging sheet, wherein the inner film is fixedly connected with the plugging sheet;

The sealing sheet is matched with the shape of the opening and corresponds to the position of the opening, the inner film covers the inner side of the opening, and the area of the inner film is larger than that of the opening;

the blocking sheet can enable the inner membrane to be broken at the opening under the action of external force, so that the opening is opened;

The plugging sheet can be embedded into the opening under the action of external force to realize the closing of the opening;

The blocking sheet is recessed toward the opening side to form a concave portion, and is provided with a rim which is larger than the opening and parallel to the opening, the rim is used for covering the outer side of the opening on the packaging box, and the concave portion is provided with an opening.

In a further aspect of the application, a package is disclosed, on which is provided a closure structure according to any one of the above.

The application has the advantages and beneficial effects that:

in the sealing structure, the sealing sheet matched with the opening shape is arranged at the opening position of the composite packaging material, and the pull tab or the sealing sheet arranged at the outer side of the opening is acted by external force, so that the inner film at the inner side of the opening position is broken at the opening of the packaging box to realize opening of the opening, and the sealing sheet can be embedded into the opening to realize closing of the opening under the action of the external force, so that the opening of the packaging box can be repeatedly opened and closed.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 is a longitudinal sectional view of a seal structure according to an embodiment 1 of the present application;

FIG. 2 is a longitudinal sectional view of another seal structure according to embodiment 1 of the present application;

FIG. 3 is a longitudinal sectional view of a seal structure in embodiment 2 of the present application;

FIG. 4 is a longitudinal sectional view of a seal structure in embodiment 3 of the present application;

FIG. 5 is a longitudinal sectional view of another seal structure according to embodiment 3 of the present application;

FIG. 6 is a longitudinal sectional view and a top view of a sealing structure according to still another embodiment 3 of the present application;

FIG. 7 is a longitudinal sectional view and a top view of a sealing structure according to still another embodiment 3 of the present application;

FIG. 8 is a longitudinal sectional view of a sealing structure in which both the upper and lower edges of a sealing sheet are provided with inclined surfaces in example 4 of the present application;

FIG. 9 is a longitudinal sectional view of a sealing structure in which both the upper and lower edges of the sealing sheet are chamfered in example 4 of the present application;

FIG. 10 is a longitudinal sectional view of a sealing structure with a slope on the upper edge of a sealing sheet according to embodiment 4 of the present application;

FIG. 11 is a longitudinal sectional view of a sealing structure with a slope on the upper edge of a sealing sheet according to another embodiment 4 of the present application;

FIG. 12 is a longitudinal sectional view showing a sealing structure with a connecting member on a sealing sheet in example 4 of the present application;

fig. 13 is a step diagram showing the production process of a package sealing structure in embodiment 5 of the present application;

fig. 14 is a step diagram showing the production process of another package sealing structure in embodiment 5 of the present application;

fig. 15 is a diagram showing the steps of the process for manufacturing the sealing structure of the package according to still another embodiment 5 of the present application.

FIG. 16 is a longitudinal sectional view of a seal structure according to embodiment 6 of the present application;

Fig. 17 is a longitudinal sectional view and a top view of another sealing structure in embodiment 6 of the present application.

The drawing comprises 1, a pull tab, 2, a plugging sheet, 3, a composite packaging material, 4, an opening, 5, an inner film, 6, an outer film, 7, an arc-shaped groove and 8, and a connecting part.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The following describes in detail the technical solutions provided by the embodiments of the present invention with reference to the accompanying drawings.

Example 1

The embodiment discloses a sealing structure of a packaging box, wherein the packaging box is made of a composite packaging material, and the composite packaging material comprises a base layer, a barrier layer, a waterproof layer and an innermost layer. The base layer of the composite packaging material is generally made of base paper, such as white base paper or cattle base paper, and can provide necessary stiffness for the composite packaging material, so that the packaging box can maintain a stable shape. Barrier layers are critical to composite packaging materials for liquid food packaging, which play a critical role in the shelf life of liquid food, oxygen permeation being a major cause of deterioration of the packaging contents of the food packaging, and the barrier layers extend the shelf life of the food by preventing oxygen permeation into the interior of the packaging container, aluminum foil being commonly used as a barrier layer in composite packaging materials. The water barrier layer is typically a thermoplastic resin, preferably a polyolefin, including but not limited to low density polyethylene (Low Density Polyethylene, LDPE), metallocene polyethylene (m-PE), or a mixture of both. The waterproof layer is positioned at the outermost side of the composite packaging material, can provide waterproof and dustproof performances, and can protect printed pictures and texts of the composite packaging material from being worn. The innermost layer of the composite packaging material is in direct contact with the packaging contents. The innermost layer is typically a thermoplastic resin, preferably comprising a polyolefin, such as Polyethylene (PE), including but not limited to linear low density Polyethylene (Linear Low Density Polyethylene, LLDPE), ultra low density Polyethylene, metallocene Polyethylene, or mixtures thereof. An adhesive layer is generally disposed between the base layer and the barrier layer, and between the barrier layer and the innermost layer, and serves to adhere adjacent layers, typically using an adhesive polymer layer, such as a modified polypropylene-based thermoplastic adhesive polymer. The packaging box is provided with an opening serving as an outlet for outflow or drinking of packaging contents, the opening is formed by punching on the composite packaging material through punching equipment, and a sealing structure is correspondingly arranged at the position of the opening for closing the opening.

As shown in fig. 1, the sealing structure of the present embodiment includes a pull tab 1, an inner film 5, and a sealing sheet 2.

The pull tab 1 covers the outside of the opening 4 in the composite packaging material 3, the outside being the side facing the outside air and the inside being the side facing the package contents, unless otherwise specified in the present application. The area of the pull tab 1 is larger than the area of the opening 4. The pull tab 1 is generally made of a composite material, and may be a composite material including a barrier material and a fusible material, wherein the barrier material is at least one of aluminum foil or barrier paper, and the fusible material is at least one selected from plastics, PLA or PBAT. For example, the pull tab 1 is a composite of barrier paper (such as nanocellulose paper) and PE or a composite of aluminum foil and PE. The barrier paper or aluminum foil can be replaced by LDPE (Low-density Polyethylene, low density Polyethylene), HDPE (HIGH DENSITY Polyethylene ), PP (Polypropylene), PA (Polyamide ), PLA (Polylactic Acid, polylactic acid) or PBAT (Butyleneadipate-co-terephthalate), paper and other materials. The pull tab 1 made of aluminum foil can be fixed by electric heating, PE in the pull tab 1 is melted during heating, the pull tab 1 is fixedly adhered to the composite packaging material 3, and the PE can be replaced by PP, PA, PLA or PBAT. The pull tab 1, which is made of a material that does not include aluminum foil, may be glued to the composite packaging material 3.

The inner film 5 covers the inner side of the opening 4, and the area of the inner film 5 is larger than the area of the opening 4. The inner film 5 may be a PE (Polyethylene) film or a composite film, such as a PE laminated on both sides of an EVOH (ETHYLENE VINYL alcohol copolymer, ethylene/vinyl alcohol copolymer) material, and the EVOH and PE are bonded with an adhesive to form a PE/adhesive/EVOH/adhesive/PE composite. The EVOH can be replaced by a vapor deposition film of metal oxides such as PVOH (Polyvinyl Alcohol ), PVDC (Poly-VINYLIDENE CHLORIDE, polyvinylidene chloride), PA (Polyamide ) or Al ₂O₃, so that the inner film 5 prepared from the composite material has a certain barrier property, and the shelf life of the package contents can be prolonged.

In this embodiment, as shown in fig. 1, the blocking sheet 2 is located at the inner side of the pull tab 1, the inner film 5 is attached to the innermost layer of the composite packaging material 3 at a portion other than the opening 4, the inner film 5 at the opening 4 is fixedly connected with the blocking sheet 2, that is, the blocking sheet 2 is located between the pull tab 1 and the inner film 5, an opening can be formed in the middle of the blocking sheet, the size of the opening is not limited, the blocking sheet can be embedded into the opening under the action of external force, and the blocking sheet and the pull tab jointly realize the closing of the opening.

The plugging sheet 2 is made of plastic, paper-plastic composite material or degradable biological material, the plugging sheet 2 can be made of injection-moldable material, such as plastic, specifically PE, preferably LDPE, HDPE, PP, PA, PLA, PBAT or any one or a combination of a plurality of PE/PLA, such as PE/PLA combination, and the prepared plugging sheet 2 can be solid or hollow, so long as the shape of the plugging sheet 2 is matched with the opening 4, and the material strength is enough to seal the opening 4. The hollow plugging sheet not only can further reduce the plastic, but also has better elasticity, and can better close the opening after being embedded. The plugging sheet 2 may be made of paper or a composite of paper and plastic, and of course, the plugging sheet 2 may be made of other materials, such as wood, bamboo, etc., and is within the scope of the present application. When the plugging sheet 2 is made of plastic or other injection-moldable material, the plugging sheet 2 can be made into a shape and then fixed on the inner side of the pull tab 1, the plugging sheet 2 can also be directly injection-molded on the inner side of the pull tab 1, and then the pull tab 1 with the plugging sheet 2 is fixed on the composite packaging material 3. In the production process, the pull tab 1, the plugging sheet 2 and the inner film can be respectively prepared from different materials and then combined together in a heat sealing or bonding mode, and the pull tab 1, the plugging sheet 2 and the inner film 5 can also be prepared from the same materials, so that the pull tab 1 and the plugging sheet 2 can be integrally prepared and molded in the embodiment.

Specifically, the plugging sheet 2 is fixed on the pull-tab 1, the shape of the plugging sheet 2 is matched with that of the opening 4, and corresponds to the position of the opening 4, one surface of the plugging sheet 2 is fixedly connected with the pull-tab 1, the other surface of the plugging sheet 2 is fixedly connected with the inner film 5, under the action of external force, the binding force between the plugging sheet 2 and the pull-tab 1 and the binding force between the plugging sheet 2 and the inner film 5 are larger than the tearing strength of the inner film 5 when the pull-tab 1 is lifted or the pull-tab 1 is pressed down, so that the inner film 5 at the position of the opening 4 is torn, the opening 4 is opened, and liquid can be poured out from the opening 4. Tear strength (TEAR STRENGTH) refers to the force required to tear the inner film 5. After opening, the closure foil 2 can be pulled out of the opening 4 and/or pushed back, for example by pressing the closure foil 2 into the opening 4, so that the opening 4 is closed. In order to enable the plugging sheet 2 to better close the opening 4, the whole size of the plugging sheet 2 can be slightly larger than the opening 4, or the local size of the plugging sheet 2 is slightly larger than the opening 4, so that the plugging sheet 2 is in contact with the edge of the opening 4 more tightly, and the liquid in the packaging box is effectively prevented from flowing out. The middle part of the plugging sheet 2 can be provided with an opening, and the opening can further reduce the plastic consumption of the plugging sheet 2, so that the plugging sheet meets the requirements of environmental protection and plastic reduction. If the opening is provided in the closure flap 2, the closure flap 2 essentially closes the opening 4 by a tight closure between its outer edge and the inner edge of the opening 4 before or after the opening 4 has been opened or again, while the opening is partially closed by a fixed connection of the closure flap 2 to the pull tab 1. The plugging sheet 2 may also be a hollow structure and an opening is provided in the middle of the plugging sheet 2. The hollow structure of the plugging sheet 2 and the open pores in the middle part can further reduce the plastic usage amount of the plugging sheet 2, and the plugging sheet has better elasticity, is tightly combined with the edge of the opening after being embedded, and can better close the opening.

As shown in fig. 1, the sealing structure may further include an outer film 6, the outer film 6 is disposed at the outer side of the opening 4, the pull tab 1 is disposed at the outer side of the outer film 6, the outer film 6 may be PE (Polyethylene), the outer film 6 may be made of a composite material of OPP (Oriented Polypropylene, stretched polypropylene) and PE, wherein the OPP may be replaced by a polyester material such as HDPE, PP, PET/PBT. The outer film 6 may be provided at the pre-punching position of the composite packaging material 3 before punching, and the area covered by the outer film 6 is punched to form the opening 4, where the area of the opening 4 is smaller than the area of the outer film 6, or the outer film 6 may be provided at the outer side of the composite packaging material 3 at the punching position, where the area of the outer film 6 is larger than the area of the opening 4, so that the outer film 6 completely covers the opening 4, and the specific structure is shown in fig. 2. When the pull tab 1 comprises aluminum foil, the pull tab 1 is heated by electric heating, so that the pull tab 1 is attached to the outer film 6 and fixed on the composite packaging material 3. The outer film 6 can avoid damaging the composite packaging material 3 when the pull tab 1 is pulled up due to the strong binding force between the pull tab 1 and the composite packaging material 3 when opening. If the outermost layer of the composite packaging material 3 is a material such as OPP, an outer film may not be required because the composite packaging material 3 is not torn by the force of separating the tab 1 from the material such as OPP after bonding. In addition, the width of the tab 1 may be set to be slightly narrower than the outer film 6 in consideration of positioning errors during the process.

Preferably, the tab 1 is only partially attached to the outer film 6, at least a portion of the tab 1 is not fixed to the composite packaging material 3, and the area of the outer film 6 may be smaller than the area of the tab 1, or the length of the outer film 6 may be smaller than the length of the tab 1, so that the portion of the tab 1 not fixed facilitates lifting the tab 1 during opening.

Further, the closure structure may further comprise a coupling means for preventing the pull tab 1 from being completely separated from the package after opening. The connecting part can be a connecting belt or a connecting strip, for example, the connecting part can be made of injection-moldable materials and the plugging sheet 2 through integral injection molding, the plugging sheet 2 is fixed on the pull tab 1, the connecting part is fixed on the composite packaging material 3, the plugging sheet 2 and the connecting part can be respectively prepared, one end of the connecting part is fixed with the pull tab 1 or the plugging sheet 2 in a gluing and hot melting mode, and the other end of the connecting part is fixed on the composite packaging material 3.

The end of the pull tab 1 can be set as a connecting part, one end of the pull tab 1 is adhered or fixed on the composite packaging material 3, and when the pull tab 1 is lifted from the other end, the pull tab 1 is still connected with the packaging box, so that the pull tab 1 is prevented from being completely separated from the packaging box, and the opened plugging sheet 2 is more convenient to store and install back on the opening 4.

The connecting part may also be a part of the composite packaging material 3, for example, when the composite packaging material 3 is perforated to form the opening 4, the composite packaging material 3 at the perforation position is not completely cut off, the cut composite packaging material 3 is lifted towards the outside of the opening and connected to the pull tab 1, for example, the sealing sheet 2 on the inner side of the pull tab 1 is connected to the inner film 5 to seal the opening 4, and the pull tab 1 can still be connected with the packaging box through the cut composite packaging material 3 after opening. In addition, the connecting component can also be a limiting mechanism or a buckling mechanism and the like which are formed by injection molding on the composite packaging material 3, and the connecting component enables the opened pull tab 1 to be still directly or indirectly connected with the packaging box, so that the repeated opening of the opening 4 by the plugging sheet 2 is more convenient to realize.

Example 2

The present embodiment discloses a sealing structure of a packaging box, unlike the foregoing embodiment 1, as shown in fig. 3, the sealing sheet 2 is located at the outer side of the pull tab 1, and the inner film 5 is fixedly connected with the pull tab 1, so as to seal the opening 4.

The pull tab 1 is attached to the position outside the opening 4 of the composite packaging material 3, so that the pull tab 1 is attached to the waterproof layer of the composite packaging material 3 outside the opening 4, and if the opening 4 is also provided with the outer film 6, the pull tab 1 is attached to the outer film 6 outside the opening 4. If the prepared tab 1 comprises aluminum foil, the tab 1 may be heated by electric heating to cause the inner film 5 to adhere to the tab 1 at the position of the opening 4, and the portion of the inner film 5 outside the opening 4 to adhere to the innermost layer of the composite packaging material 3 inside the opening 4, thereby sealing the opening 4.

The plugging sheet 2 is made of plastic, paper-plastic composite material or degradable biological material, and the plugging sheet 2 can be made of injection-moldable material, such as plastic, specifically PE, preferably LDPE, HDPE, or PP, PA, PLA or PBAT, or any one or a combination of a plurality of PE/PLA. The pull tab 1 may be fixed to the outside of the opening 4, and then the plugging sheet 2 is injection molded on the pull tab 1 or the plugging sheet 2 prepared in advance is bonded, or the plugging sheet 2 is fixed to the outside of the pull tab 1 in advance by injection molding or bonding, and then the inside of the pull tab 1 is bonded to the outside of the opening 4 of the composite packaging material 3. The prepared plugging sheet 2 can be solid or hollow, so long as the shape of the plugging sheet 2 is matched with that of the opening 4, and the material strength is enough to close the opening 4. In the production process, the pull tab 1, the plugging sheet 2 and the inner film 5 can be respectively prepared from different materials and then combined together in a heat sealing or bonding mode, and the pull tab 1, the plugging sheet 2 and the inner film 5 can also be prepared from the same materials, so that the pull tab 1 and the plugging sheet 2 can be integrally prepared in the embodiment. The middle part of the plugging sheet 2 can be provided with an opening, and the opening can further reduce the plastic consumption of the plugging sheet 2, so that the plugging sheet meets the requirements of environmental protection and plastic reduction. If the opening is provided in the closure flap 2, the closure flap 2 essentially closes the opening 4 by a tight closure between its outer edge and the inner edge of the opening 4 before or after the opening 4 has been opened or again, while the opening is partially closed by a fixed connection of the closure flap 2 to the pull tab 1. The plugging sheet 2 may also be a hollow structure and an opening is provided in the middle of the plugging sheet 2. The hollow structure of the plugging sheet 2 and the open pores in the middle part can further reduce the plastic usage amount of the plugging sheet 2, and the plugging sheet has better elasticity, is tightly combined with the edge of the opening after being embedded, and can better close the opening.

Under the action of external force, the opening 4 is realized by opening the pull-tab 1 or pressing the pull-tab 1 to break the inner film 5 at the opening 4. When the opening is carried out, the binding force between the plugging sheet 2 and the pull tab 1 and the binding force between the pull tab 1 and the inner film 5 are larger than the tearing strength of the inner film 5, so that the inner film 5 at the opening 4 is torn. After opening, the closure foil 2 can be pulled out of the opening 4 and/or pushed back, and the pressing can cause the closure foil 2 to be inserted into the opening 4, so that the opening 4 is closed.

Preferably, as shown in fig. 3, the sealing structure may further include an outer film 6, the outer film 6 is disposed at the outer side of the opening 4, and the pull tab 1 is disposed at the outer side of the outer film 6, the outer film 6 may be PE (Polyethylene), the outer film 6 may be made of a composite material of OPP (Oriented Polypropylene, stretched polypropylene) and PE, wherein the OPP may be replaced with a polyester material such as HDPE, PP, PET/PBT. The outer film 6 may be provided at a pre-punching position of the composite packaging material 3 before punching, and the opening 4 may be formed by punching in an area covered by the outer film 6, where the area of the opening 4 is smaller than the area of the outer film 6, or the outer film 6 may be provided at an outer side of the composite packaging material 3 at the punching position by punching, where the area of the outer film 6 is larger than the area of the opening 4, so that the outer film 6 completely covers the opening 4. When the pull tab 1 comprises aluminum foil, the pull tab 1 is heated by electric heating, so that the pull tab 1 is attached to the outer film 6 and fixed on the composite packaging material 3. The outer film 6 can avoid damaging the composite packaging material 3 when the pull tab 1 is pulled up due to the strong binding force between the pull tab 1 and the composite packaging material 3 when opening. In addition, the width of the tab 1 may be set to be slightly narrower than the outer film 6 in consideration of positioning errors during the process.

Further, the closure structure may further comprise a coupling means for preventing the pull tab 1 from being completely separated from the package after opening. The connecting part can be a connecting belt or a connecting strip, for example, the connecting part can be made of injection-molded materials and the plugging sheet 2 in an integral injection molding mode, the plugging sheet 2 is fixed on the pull tab 1, the connecting part is fixed on the composite packaging material 3, the pull tab 1 can be attached to the composite packaging material 3 or the outer film 6, the plugging sheet 2 and the connecting part are formed on the pull tab 1 in an injection molding mode, the connecting part is fixed on the composite packaging material 3, the plugging sheet 2 and the connecting part can be respectively prepared, one end of the connecting part is fixed with the pull tab 1 or the plugging sheet 2 in an adhesive and hot-melt mode, and the other end of the connecting part is fixed on the composite packaging material 3.

The end of the pull tab 1 can be set as a connecting component, one end of the pull tab 1 is adhered or fixed on the composite packaging material 3, and when the pull tab 1 is lifted from the other end which is not adhered or fixed on the composite packaging material 3, the pull tab 1 still remains connected with the packaging box, so that the pull tab 1 is prevented from being completely separated from the packaging box, and the opened sealing sheet 2 is convenient to store and install back on the opening 4.

The connecting member may be a part of the composite packaging material 3, for example, when the composite packaging material 3 is perforated to form the opening 4, the composite packaging material 3 at the perforation position is not completely cut and separated, the cut composite packaging material 3 is lifted and connected to the pull tab 1 or the sealing sheet 2 to the outside of the opening, the pull tab 1 is attached to the inner film 5 at the opening 4 to seal the opening 4, and the pull tab 1 or the sealing sheet 2 is connected to the packaging box through the cut composite packaging material 3 after opening. In addition, the connecting component can also be in the form of a limiting mechanism or a buckling mechanism formed on the composite packaging material 3 in an injection molding way, so that the structure that the opened pull tab 1 is still directly or indirectly connected with the packaging box can be regarded as the connecting component.

In summary, in the sealing structure of the foregoing embodiment, by arranging the pull tab 1 on the outer side of the opening 4 on the composite packaging material 3, and arranging the sealing sheet 2 matching with the shape of the opening 4 on the inner side or the outer side of the pull tab 1, the inner film 5 is ruptured at the opening 4 under the action of external force, so as to realize opening of the opening 4, and the sealing sheet 2 can be pulled out and/or pushed back from the opening 4 under the action of external force, so as to realize repeatedly opening and closing the opening 4 of the packaging box, thereby effectively reducing the usage amount of plastic, being more environment-friendly and reducing the manufacturing cost.

Example 3

In this embodiment, the area of the blocking sheet 2 is larger than the opening 4, the blocking sheet 2 completely covers the opening 4 and is recessed inwards at the opening 4 to form a concave part, and the blocking sheet has a border which is larger than the opening 4 and is parallel to the opening 4, and the border is used for covering the outer side of the opening 4 on the packing box. The closure tab 2 located on the inside of the pull tab 1 has an inwardly concave recess at the opening 4 as shown in fig. 4, and the closure tab 2 located on the outside of the pull tab 1 has an inwardly concave recess at the opening 4 as shown in fig. 5. The concave part of the plugging sheet 2 can reduce the volume of the plugging sheet 2, thereby greatly reducing the plastic consumption required by forming the plugging sheet 2 and meeting the requirements of environmental protection and plastic reduction. Further, the opening may be formed in the closure sheet 2 by punching or injection molding, and as shown in fig. 6, the closure sheet 2 located on the inner side of the pull tab 1 has a concave portion recessed inward and having an opening at the opening 4, and as shown in fig. 7, the closure sheet 2 located on the outer side of the pull tab 1 has a concave portion recessed inward and having an opening at the opening 4. The opening on the plugging sheet 2 can be used as a straw hole, and the straw can directly extend into the packaging box from the opening on the plugging sheet 2, when the straw is not used, the opening 4 can be directly opened through the pull tab 1, and after the opening, the plugging sheet 2 is pushed back, so that the concave part of the plugging sheet 2 is embedded into and seals the opening 4. The openings in the closure sheet 2 provide a more flexible way of opening the openings, while the amount of plastic used in the closure sheet 2 can be further reduced, the size of the openings being unlimited. If an opening is provided in the closure flap 2, the opening is partially closed by the fixed connection of the closure flap 2 to the pull tab 1 before or after the opening 4 has been opened. The closure structure may further comprise an outer film 6, the outer film 6 being arranged outside the opening 4 and inside the pull tab 1.

The prepared plugging sheet 2 can be solid or hollow, so long as the shape of the plugging sheet 2 is matched with that of the opening 4, and the material strength is enough to close the opening 4. The plugging sheet 2 is made of plastic, paper-plastic composite material or degradable biological material. In the production process, the pull tab 1, the plugging sheet 2 and the inner film 5 can be respectively prepared from different materials and then combined together in a heat sealing or bonding mode, and of course, the pull tab 1, the plugging sheet 2 and the inner film 5 can also be prepared from the same materials, and at the moment, the pull tab 1 and the plugging sheet 2 can also be integrally prepared.

Example 4

The present embodiment discloses a sealing structure of a packaging box, which is different from the above three embodiments in that, as shown in fig. 8 to 12, the sealing sheet 2 is located at the inner side of the inner film 5, and the inner side of the inner film 5 is the side facing the package content.

The inner film 5 is arranged inside the opening 4 of the composite packaging material 3, the inner film 5 is heated to make the inner film 5 be attached to the innermost layer inside the composite packaging material 3 at the position outside the opening 4, and then the prefabricated plugging sheet 2 is fixed at the position corresponding to the opening 4 inside the inner film 5 or the plugging sheet 2 is formed by injection molding at the position corresponding to the opening 4 inside the inner film 5.

The sealing sheet 2 may be fixed on the inner film 5, and then the inner film 5 is attached to the inner side of the opening 4 of the composite packaging material 3, specifically, for example, the sealing sheet 2 is formed by injection molding on one side of the inner film 5 or the sealing sheet 2 which is manufactured and formed in advance is fixed, the inner film 5 is heated, and the other side of the inner film 5 is attached to the inner side of the opening 4 of the composite packaging material 3 for sealing.

The plugging sheet 2 is made of plastic, paper-plastic composite material or degradable biological material. The sealing sheet 2 may be solid or hollow, so long as the shape of the sealing sheet 2 matches with the opening 4, and the material strength is enough to seal the opening 4. In the production process, the pull tab 1, the plugging sheet 2 and the inner film 5 can be respectively prepared from different materials and then combined together in a heat sealing or bonding mode, and of course, the pull tab 1, the plugging sheet 2 and the inner film 5 can also be prepared from the same materials, for example, the plugging sheet 2 and the inner film 5 can be integrally prepared in the embodiment.

When opened, the inner film 5 is ruptured and the tab 1, the ruptured portion of the inner film 5 and the closure tab 2 leave the opening 4 as a whole. An opening may be provided in the middle of the blocking sheet 2, and the size of the opening is not limited. If an opening is arranged in the plugging sheet 2, before the opening 4 is opened, the opening part is closed through the fixed connection between the inner film 5 and the pull tab 1, after the opening, the plugging sheet 2 is still fixedly connected with the pull tab 1 through the inner film 5, the plugging sheet 2 can be re-embedded into the opening 4 after being pulled out from the opening 4, and the opening part is closed by the pull tab 1 and the torn inner film 5.

As shown in fig. 8 to 12, the sealing structure may further include an outer film 6, the outer film 6 is disposed at the outer side of the opening 4, the pull tab 1 is disposed at the outer side of the outer film 6, the outer film 6 may be PE (Polyethylene), and the outer film 6 may be made of a composite material of OPP (Oriented Polypropylene, stretched polypropylene) and PE. Wherein OPP can be replaced by HDPE, PP, PET/PBT and other polyester materials. In the production process, the outer film 6 can be adhered to the composite packaging material 3 first, then the area covered by the outer film 6 is perforated to form the opening 4, or the composite packaging material 3 can be perforated to form the opening 4 first, then the outer film 6 is arranged outside the opening 4, and the area of the outer film 6 is larger than the area of the opening 4, so that the outer film 6 can completely cover the opening 4.

Preferably, the tab 1 is only partially attached to the outer film 6, and at least a portion of the tab 1 is not fixed to the composite packaging material 3, so that the outer film 6 may have an area smaller than that of the tab 1, or the length of the outer film 6 may be smaller than that of the tab 1, so as to facilitate lifting of the tab 1. The inner film 5 and the plugging sheet 2, the inner film 5 and the pull tab 1 and the outer film 6 and the pull tab 1 are fixedly connected through heat sealing, gluing, ultrasonic wave or inductance.

Further, the closure structure may further comprise a coupling means for preventing the pull tab 1 from being completely separated from the package after opening. Specifically, as shown in fig. 12, one end of the connecting member 8 is connected to the inner film 5 around the opening 4, one end of the connecting member 8 may be connected to the innermost layer of the composite packaging material 3 near the opening 4, and the other end of the connecting member 8 is fixedly connected to the sealing sheet 2. After the pull tab 1 is lifted, the blocking sheet 2 is still connected with the packaging box through the connecting component 8, so that the blocking sheet 2 is further prevented from being separated from the packaging box. For example, the connecting part 8 may be a connecting band or a connecting strip, and the connecting part 8 may be integrally injection-molded with the plugging sheet 2 by using an injection-moldable material.

As shown in fig. 8-12, the edges of the plugging sheet 2 are chamfered or provided with inclined planes, so that the plugging sheet 2 is easier to be embedded into the opening 4 under the action of external force, or the plugging sheet 2 is not easy to be separated from the opening 4 after being embedded into the opening 4, and the firmness of sealing the opening 4 is ensured.

In a preferred embodiment, as shown in fig. 11, the inclined surface is provided with a plurality of arc-shaped protrusions or arc-shaped grooves 7 in the horizontal direction. When the plugging sheet 2 is embedded into the opening 4, the edge of the opening 4 is just positioned at the joint of the two arc-shaped bulges or in the arc-shaped groove 7, so that the relative fixation of the plugging sheet 2 and the packaging box is realized, the plugging sheet 2 can be effectively prevented from being separated from the opening 4, and meanwhile, the liquid in the packaging box can be prevented from flowing out.

The composite packaging material 3 is formed by compounding a plurality of layers of structures such as a paper base layer, a barrier layer (such as aluminum foil), a waterproof layer, an innermost layer, an adhesive layer and the like. The thickness of the plugging sheet 2 is 1/8-8 times the thickness of the base layer of the composite packaging material 3. Preferably, the thickness of the closure sheet 2 is 2-4 times the thickness of the base layer of the composite packaging material 3. In one or some embodiments, as shown in fig. 12, the thickness of one side of the closure tab 2 is less than the thickness of the other side, and when the attachment means is provided on the side of the closure tab 2 where the thickness of the closure tab 2 is less or no attachment means is provided on the closure tab 2, the pull tab 1 is pulled up from the side of the closure tab 2 where the thickness is greater. More preferably, when the connecting member 8 is provided on the side of the closure sheet 2 where the thickness is larger, the pull tab 1 is pulled up from the side of the closure sheet 2 where the thickness is smaller.

Example 5

In one embodiment of the present application, a process for producing a package sealing structure is disclosed, as shown in fig. 13, the process comprising the steps of:

and S1, punching the composite packaging material to form an opening.

And S2, respectively arranging an inner film and a pull tab on the inner side and the outer side of the opening, wherein the areas of the inner film and the pull tab are larger than the area of the opening.

And S3, arranging a blocking sheet on the pull tab or the inner film, wherein the blocking sheet is matched with the shape of the opening and corresponds to the position of the opening.

In one embodiment, as shown in fig. 14, the process for producing the package sealing structure further includes:

an outer membrane is provided outside the opening.

In another embodiment, as shown in fig. 15, the process for producing the package sealing structure further includes:

The pull tab is arranged above the outer film, the pull tab is partially adhered to the outer film, at least part of the pull tab is not fixed on the composite packaging material, for example, the area of the outer film is smaller than that of the pull tab, or the length of the outer film is smaller than that of the pull tab, and the non-adhered part of the pull tab is convenient for lifting the pull tab when the pull tab is opened. The pull tab is typically made of a composite material, such as paper-PE or aluminum foil-PE, and the paper may be a barrier paper, such as nanocellulose paper. The paper or aluminum foil may be replaced by LDPE (low-density Polyethylene, low density Polyethylene), HDPE (HIGH DENSITY Polyethylene ), PP (Polypropylene), PA (polyamide), PLA (Polylactic Acid ) or PBAT (butyleneadipate-co-polybutylene adipate/terephthalate).

In one embodiment, the closure flap is secured to the inside of the pull tab, and the inner film is fixedly attached to the closure flap at the location of the opening in the composite packaging material to close the opening. One of the specific modes is that a punching device is used for punching holes on the composite packaging material to form openings, an inner film is adhered to the inner side of the openings, a plugging sheet is arranged on the pull tab and matched with the shapes of the openings, and if the plugging sheet is made of plastic materials such as plastics, the plugging sheet can be formed by injection molding on the inner side face of the pull tab through an injection molding process by the injection molding device. Or the plugging sheet can be manufactured and molded first and then fixed on the inner side of the pull tab. And arranging the surface of the plugging sheet, which is not fixed with the pull tab, at the opening position correspondingly, and fixedly connecting the plugging sheet with an inner film at the opening position through a heat sealing process or an adhesive process to close the opening.

Further, the sealing structure may further include a connection member for preventing the pull tab from being completely separated from the package after opening. The connecting part can be formed by integrally injection molding the injection-moldable material and the blocking sheet, for example, injection molding equipment simultaneously injection-molds the blocking sheet with the connecting part on one surface of the pull tab, or injection-molds the blocking sheet with the connecting part, then fixes the blocking sheet on the pull tab, and then heat-seals or glues the other end of the connecting part on the composite packaging material when the blocking sheet is fixedly connected with the inner film through heat sealing or gluing.

The end of the pull tab can be set as a connecting part, one end of the pull tab is adhered or fixed on the composite packaging material, and when the pull tab is not adhered or the other end of the pull tab is lifted off from the composite packaging material, the pull tab is still connected with the packaging box, and the pull tab is prevented from being completely separated from the packaging box, so that the opened sealing sheet is convenient to store and install back to the opening.

The connecting part can also be a part of the composite packaging material, namely, when the composite packaging material is perforated to form an opening, the composite packaging material at the perforation position is not completely cut off, one surface of the pull tab is fixedly connected with the blocking sheet, the cut composite packaging material is also connected to the pull tab, the blocking sheet is adhered with the inner film to close the opening, and the pull tab can still be connected with the packaging box through the cut composite packaging material after opening.

In another embodiment, the closure flap is secured to the outside of the pull tab and the inner film is fixedly attached to the pull tab at the location of the opening in the composite packaging material to close the opening.

One of the specific modes is that an outer film is arranged at a pre-punching position of the composite packaging material, a punching device punches a hole in the coverage area of the outer film to form an opening, or the outer film is arranged on the opening formed by the composite packaging material, an inner film is adhered to the inner side of the opening, a plugging sheet is arranged on the pull tab and matched with the shape of the opening, and if the plugging sheet is made of plastic material, such as plastic, the plugging sheet can be formed by injection molding on the outer side of the pull tab through injection molding equipment. Or the plugging sheet is firstly manufactured and molded, then the plugging sheet is fixed on the outer side of the pull tab, one surface of the pull tab, which is not provided with the plugging sheet, is fixedly connected with the inner film at the opening to close the opening through a heat sealing process or an adhesive process, and the plugging sheet corresponds to the opening after the sealing.

Further, the sealing structure may further include a connection member for preventing the pull tab from being completely separated from the package after opening. Specifically, the connecting part can be formed by integrally injection molding the injection-moldable material and the plugging sheet, for example, injection molding equipment simultaneously injection-molds the plugging sheet with the connecting part on one surface of the pull tab, or injection-molds the plugging sheet with the connecting part, then fixes the plugging sheet on the pull tab, and then heat-seals or glues the other end of the connecting part on the composite packaging material when the pull tab is fixedly connected with the inner film through heat sealing or gluing.

The end of the pull tab can be set as a connecting part, one end of the pull tab is adhered or fixed on the composite packaging material, and when the pull tab is not adhered or the other end of the pull tab is lifted off from the composite packaging material, the pull tab is still connected with the packaging box, and the pull tab is prevented from being completely separated from the packaging box, so that the opened plugging sheet is more convenient to store and install back to the opening.

The connecting part can also be a part of the composite packaging material, namely, when the composite packaging material is perforated to form an opening, the composite packaging material at the perforation position is not completely cut off, one surface of the pull tab is fixedly connected with the plugging sheet, the composite packaging material cut to form the opening is connected with the plugging sheet or the pull tab, the pull tab is adhered with the inner film to close the opening, and the pull tab can still be connected with the packaging box through the composite packaging material forming the opening after opening.

In a further embodiment, the closure flap is secured to the inner side of the inner film and fixedly connected thereto, and the inner film is bonded to the pull tab at the location of the opening in the composite packaging material to close the opening.

One of the specific modes is that an outer film is arranged at a preset position of the composite packaging material, a punching device punches holes in the coverage area of the outer film to form an opening, or the outer film is arranged on the opening formed by the composite packaging material, an inner film is adhered to the inner side of the opening, and then a plugging sheet is arranged on the inner side surface of the inner film, or a plugging sheet is arranged on one surface of the inner film, and then the inner film with the plugging sheet is arranged on the inner side of the opening. The shape of the plugging sheet is matched with that of the opening, the position corresponds to the opening. The pull tab and the inner film at the opening are fixedly connected together through a heat sealing process or an adhesive process to close the opening.

Further, the sealing structure may further include a connection member for preventing the pull tab from being completely separated from the package after opening. Specifically, the connecting part can be formed by injection molding of an injection-moldable material and the blocking sheet, for example, injection molding equipment is used for simultaneously injection molding the blocking sheet with the connecting part on the inner film, or the blocking sheet with the connecting part is formed by injection molding, then the blocking sheet is fixed on the inner film, and when the inner film is fixed at the opening position through heat sealing or gluing, the other end of the connecting part is fixed on the innermost layer of the composite packaging material near the opening or the inner film.

In one embodiment, the edges of the occlusion sheeting are beveled or beveled.

Further, a plurality of arc-shaped protrusions or arc-shaped grooves in the horizontal direction are formed on the inclined plane.

The composite packaging material comprises a base layer, a barrier layer, a waterproof layer, an innermost layer and an adhesive layer. The base layer of the composite packaging material is typically a base paper, such as white or bovine base paper.

In one embodiment, the thickness of the closure sheet is made 1/8-8 times the thickness of the base layer of the composite packaging material.

In a preferred embodiment, the thickness of the closure sheet is made 2-4 times the thickness of the base layer of the composite packaging material.

In one embodiment, the closure tab is made with a smaller thickness on one side of the closure tab than on the other side, preferably by pulling the tab from the side of the closure tab with the smaller thickness.

Example 6

The present embodiment discloses a sealing structure of a packing box, which is different from embodiment 1 in that the sealing structure of the present embodiment includes an inner film 5 and a blocking sheet 2, but does not include a pull tab. The packaging box is made of a composite packaging material 3, the composite packaging material 3 comprises a base layer, a barrier layer, a waterproof layer and an innermost layer, the sealing structure comprises an inner film 5 and a sealing sheet 2, the sealing sheet 2 is matched with the opening 4 in shape and corresponds to the opening 4 in position, the inner film 5 covers the inner side of the opening 4, the area of the inner film 5 is larger than that of the opening 4, the sealing sheet 2 can break the inner film 5 at the opening 4 under the action of external force to open the opening 4, and the sealing sheet 2 can be embedded into the opening 4 under the action of external force to close the opening 4.

The sealing structure may further comprise an outer membrane 6, the outer membrane 6 being arranged outside the opening 4. The sealing sheet 2 is connected with the composite packaging material 3 through the outer film 6, the area of the sealing sheet 2 can be slightly larger than that of the outer film 6, and external force can act on the part of the sealing sheet 2 beyond the outer film 6 to open the opening 4.

As shown in fig. 16, the area of the blocking sheet 2 is larger than the opening 4, the blocking sheet 2 completely covers the opening 4 and is recessed inward at the opening 4 to form a recess, and has a rim larger than the opening 4 and parallel to the opening 4, the rim being for covering the outside of the opening 4 on the package. As shown in fig. 17, the concave portion of the plugging sheet 2 may be perforated or injection-molded to form an opening, and the size of the opening is not limited. The opening of the concave part of the blocking sheet 2 can be used as a straw hole, and the straw can directly extend into the packaging box from the opening of the blocking sheet 2, when the straw is not used, the opening 4 can be directly opened through the blocking sheet 2, and after the opening, the blocking sheet 2 is pushed back, so that the concave part of the blocking sheet 2 is embedded into and seals the opening 4. If an opening is provided in the closure foil 2, the opening 4 is closed by the inner membrane 5 before the opening 4 is opened, and after opening the inner membrane 5 is ruptured, a re-closing of the opening 4 cannot be achieved. The openings in the closure foil 2 provide a more flexible way of opening the opening, while at the same time the amount of plastic used in the closure foil 2 can be further reduced.

Example 7

The application discloses a production process of a sealing structure of a packaging box, which comprises the following steps:

And punching the composite packaging material to form an opening.

An inner film is arranged on the inner side of the opening, and the area of the inner film is larger than that of the opening.

And a blocking sheet is arranged on the outer side of the inner membrane, is matched with the shape of the opening and corresponds to the position of the opening.

The inner film and the blocking sheet are fixedly connected through a heat sealing process or an adhesive process, the blocking sheet can be broken at the opening under the action of external force, the opening of the opening is realized, and the blocking sheet can be embedded into the opening under the condition that the blocking sheet is pressed, so that the opening is closed.

Those skilled in the art will appreciate that the order and proximity of the steps described above is not limiting, similar to example 5. For example, the opening may be formed by providing an outer film on the outside of the opening before punching to form the opening, that is, by providing an outer film on the outside of the composite packaging material and then punching in the area covered by the outer film. The outer film may be provided outside the opening after punching the opening and before the inner film is provided inside the opening. An outer membrane may be provided outside the opening after the inner membrane is provided inside the opening. In addition, a blocking sheet may be provided on the inner film, and then the combination of the inner film and the blocking sheet may be provided to the opening.

The bonding between the adjacent portions was similar to that of example 5. If an outer film is arranged, the blocking sheet is arranged outside the outer film, and the blocking sheet part is adhered to the outer film. Preferably, the area of the plugging sheet is larger than the opening, the plugging sheet completely covers the opening and is inwards recessed at the opening to form a concave part, the plugging sheet is provided with a border which is larger than the opening and is parallel to the opening, the border is used for covering the outer side of the opening on the packaging box, and the border is adhered with the outermost layer or the outer film of the composite packaging material.

An embodiment of the application discloses a packaging box, which is provided with the sealing structure in any embodiment, can repeatedly open and close the opening of the packaging box, is convenient to carry and is more environment-friendly.

The foregoing is merely a specific embodiment of the invention and other modifications and variations can be made by those skilled in the art in light of the above teachings. It is to be understood by persons skilled in the art that the foregoing detailed description is provided for the purpose of illustrating the invention more fully, and that the scope of the invention is defined by the appended claims.

Claims

1. A sealing structure for a packaging box, the packaging box being made of a composite packaging material comprising a base layer, a barrier layer, a waterproof layer, and an innermost layer, wherein the sealing structure comprises: a pull tab, an inner film, and a sealing sheet;

The pull tab covers the outer side of the opening on the packaging box, and the area of the pull tab is larger than the area of the opening. The blocking sheet matches the shape of the opening and corresponds to the position of the opening. The inner film covers the inner side of the opening, and the area of the inner film is larger than the area of the opening.

The pull tab can cause the inner membrane to rupture at the opening under the action of an external force, thereby opening the opening;

The blocking sheet can be embedded in the opening under the action of external force to achieve sealing of the opening;

The thickness of one side of the blocking sheet is smaller than the thickness of the other side, and the pull tab is pulled up from the side of the blocking sheet with the smaller thickness;

The overall size of the blocking sheet is slightly larger than the opening; and

The blocking sheet is a hollow structure and/or the middle portion of the blocking sheet has an opening.

2. The sealing structure according to claim 1, wherein the blocking sheet is located on the inner side of the pull tab, and the inner membrane is fixedly connected to the blocking sheet.

3 . The sealing structure according to claim 1 , wherein the sealing sheet is located on the outer side of the pull tab, and the inner film is fixedly connected to the pull tab.

4. The sealing structure according to claim 1, wherein the sealing sheet is located on the inner side of the inner membrane, and the pull tab is fixedly connected to the inner membrane.

5 . The sealing structure according to claim 1 , further comprising an outer film, wherein the outer film is arranged on the outside of the opening, and the pull tab is arranged on the outside of the outer film.

6. The sealing structure according to claim 5, characterized in that the area of the outer film is smaller than the area of the pull tab or the length of the outer film is smaller than the length of the pull tab, and the pull tab portion is fixedly connected to the outer film.

7. The sealing structure according to claim 1, wherein the sealing sheet is made of plastic, paper, or a paper-plastic composite material.

8. The sealing structure according to claim 1, wherein the pull tab is a composite material comprising a barrier material and a fusible material, the barrier material is at least one of aluminum foil and barrier paper, and the fusible material is plastic.

9. The sealing structure according to claim 1, wherein the inner film is a PE film or a composite film.

10. The sealing structure according to claim 1, wherein the edge of the sealing sheet is chamfered or provided with a slope.

11. The sealing structure according to claim 10, wherein the inclined surface is provided with a plurality of horizontal arc-shaped protrusions or arc-shaped grooves.

12. The sealing structure according to claim 1, wherein the thickness of the sealing sheet is 1/8 to 8 times the thickness of the base layer of the composite packaging material.

13 . The sealing structure according to claim 12 , wherein the thickness of the sealing sheet is 2-4 times the thickness of the base layer of the composite packaging material.

14 . The sealing structure according to claim 1 , further comprising a connecting component, wherein the connecting component connects the composite packaging material and the pull tab or the sealing sheet.

15. The sealing structure according to any one of claims 1 to 13, characterized in that the sealing structure further comprises a connecting component, wherein the connecting component is an end portion of the pull tab, and the end portion of the pull tab is connected to the composite packaging material.

16. The sealing structure according to claim 4 is characterized in that the sealing structure further comprises a connecting component, one end of which is fixedly connected to the inner membrane or the innermost layer near the inner side of the opening, and the other end of which is fixedly connected to the sealing sheet.

17. The sealing structure according to claim 2 or 3, wherein the sealing sheet is recessed toward the opening to form a recess.

The sealing structure according to claim 17 , wherein the recess has an opening.

19. A production process for a packaging box sealing structure, characterized in that the production process comprises the following steps:

Step S1: punching holes in the composite packaging material to form openings;

Step S2: providing an inner film and a pull tab on the inner side and the outer side of the opening respectively, wherein the areas of the inner film and the pull tab are both larger than the area of the opening;

Step S3: providing a blocking sheet on the pull tab or the inner membrane, wherein the blocking sheet matches the shape of the opening and corresponds to the position of the opening;

Step S4: The inner membrane, the blocking sheet and the pull tab are fixedly connected by a heat sealing process or an adhesive process, so that the pull tab can cause the inner membrane to rupture at the opening under the action of an external force, thereby opening the opening; when the blocking sheet is pressed, the blocking sheet can be embedded in the opening to close the opening; the thickness of one side of the blocking sheet is smaller than the thickness of the other side, and the pull tab is pulled up from the side of the blocking sheet with a smaller thickness; the overall size of the blocking sheet is slightly larger than the opening; and the blocking sheet is a hollow structure and/or the middle part of the blocking sheet has an opening.

20. The production process according to claim 19, characterized in that the production process further comprises:

Disposing an outer membrane outside the opening; or,

An outer film is arranged on the outer side of the composite packaging material, and holes are punched in the area covered by the outer film to form the opening.

21. A sealing structure for a packaging box, the packaging box being made of a composite packaging material, the composite packaging material comprising a base layer, a barrier layer, a waterproof layer, and an innermost layer, wherein the sealing structure comprises: an inner film and a sealing sheet, the inner film being fixedly connected to the sealing sheet;

The blocking sheet matches the shape of the opening on the packaging box and corresponds to the position of the opening; the inner film covers the inner side of the opening, and the area of the inner film is larger than the area of the opening;

The blocking sheet can cause the inner membrane to rupture at the opening under the action of external force, thereby opening the opening;

The thickness of one side of the blocking sheet is smaller than the thickness of the other side;

The overall size of the blocking sheet is slightly larger than the opening; and

22. The sealing structure according to claim 21 is characterized in that the sealing sheet is recessed toward the opening side to form a recess and has an edge that is larger than the opening and parallel to the opening, and the edge is used to cover the outer side of the opening on the packaging box.

23. A sealing structure for a packaging box, the packaging box being made of a composite packaging material, the composite packaging material comprising a base layer, a barrier layer, a waterproof layer, and an innermost layer, wherein the sealing structure comprises: an inner film and a sealing sheet, the inner film being fixedly connected to the sealing sheet;

The sealing sheet is recessed toward the opening to form a recess, and has an edge that is larger than the opening and parallel to the opening, the edge being used to cover the outer side of the opening on the packaging box, and the recess has an opening;

The overall size of the blocking sheet is slightly larger than the opening; and

24. A packaging box, characterized in that the packaging box is provided with a sealing structure according to any one of claims 1-18 and 21-23.