JP2000264334A - Highly safe can lid after opening - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the safety of a torn portion left behind in the vicinity of an opening part on a can body side after a stay-on type easy-open lid provided with an opening guide line is opened by providing an undulation on a can body side of the inside of a can at an opening portion in the can lid which is provided with the opening portion in the can lid, and the lid is opened along the opening portion. SOLUTION: In order to improve the safety when a hand, a finger, etc., is inserted from an opening part 3, an undulated portion 4 is provided on a body side inside a can of an opening guide line 2. In this undulated portion 4, the distance L from the center line of the opening guide line 2 to the starting position 5 of the undulated portion 4 is preferably 1.5 mm or under, and its depth D is preferably 1.5 mm or over. The angle α formed by a line to connect the center of the opening guide line 2 to an apex 6 of the undulated portion 4 and an inner surface of a can lid is preferably at least 45 deg.. This undulated portion 4 is unnecessary for a C portion where an opening piece is still left behind, and a portion where the can body portion is close thereto and the similar role to that of the undulated portion 4 is played by the can body portion. The opening guide line 2 is formed by the trapezoidal scoring, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stay-on type easy-open lid for opening a container along a guide line using a tab, and more particularly to an easy-open easy-open lid around an opening remaining on the can body side after opening. It is about the lid.

[0002]

2. Description of the Related Art A lid made of a metal plate provided with an opening using a tab is used for beverage cans and general food cans. The lid is provided with an opening guide line, and a tab is used to cut the metal plate along the opening guide line. This method includes a pull-open type in which the tab is opened by pulling the tab and a stay-on type in which the tab is not separated from the lid even after the opening. In either of these methods, after being cut along the opening guide line,
It has been pointed out that there is a risk that the periphery of the opening remaining on the can body side becomes a sharp blade, which may cause injury to fingers. It has also been pointed out that this danger is particularly pronounced when steel is used as the lid material, since the steel has a feature that the cut is easily sharpened.

Japanese Patent Application Laid-Open No. 62-64729 proposes a method for securing the safety of a cut portion of a cut-off opening piece with respect to a pull-open lid. It is difficult to apply to the opening of the container lid.

Japanese Patent Application Laid-Open No. Hei 10-216874 discloses a method of forming a score portion by performing preliminary shearing in one direction and returning shearing in the opposite direction to form a burr caused by ductility of metal when the opening guide line is torn. Methods for suppressing generation have been proposed. However, in this method, since the shearing is performed, the workability is deteriorated, and there is a concern that the processing of the rivet portion for attaching the tab becomes difficult.

[0005]

SUMMARY OF THE INVENTION In view of such circumstances, an object of the present invention is to provide a safe container lid around a can body side opening after the opening of a stained easy-open lid provided with an opening guide line. With the goal.

[0006]

Means for Solving the Problems The present inventors have conducted basic studies to solve the above-mentioned problems. as a result,
We have found that safety can be drastically improved by appropriately controlling the shape near the opening of the easy-open lid.

That is, the gist of the present invention is as follows. (1) A can lid which is provided with a scheduled opening portion in the can lid and which is opened along the scheduled portion in use, wherein a undulation is provided on the can inner can body side of the scheduled opening portion. Highly safe can lid. (2) The can lid with high safety after opening according to the above (1), wherein the undulation starts within 1.5 mm from the end of the scheduled opening portion and the undulation depth is 1.5 mm or more. . (3) The safety after opening according to the above (1) or (2), wherein an angle between a straight line connecting an apex of the undulation from the center of the scheduled opening portion and a horizontal line of the can lid is 45 degrees or more. Highly capable can lid. (4) The highly safe can lid after opening according to the above (1), (2) or (3), wherein the material of the lid provided with the scheduled opening portion is an aluminum plate. (5) The highly safe can lid after opening according to the above (1), (2) or (3), wherein the material of the lid provided with the opening opening portion is an aluminum plate having a film adhered to the surface. . (6) The highly safe can lid after opening according to the above (1), (2) or (3), wherein the material of the lid provided with the opening scheduled portion is a cold rolled steel plate. (7) The highly safe can lid after opening according to (1), (2) or (3), wherein the material of the lid provided with the opening scheduled portion is a surface-treated steel plate. (8) The highly safe can after opening according to (1), (2) or (3), wherein the material of the lid provided with the opening scheduled portion is a cold-rolled steel sheet having a film adhered to the surface. lid. (9) A highly safe can after opening according to the above (1), (2) or (3), wherein the material of the lid provided with the opening scheduled portion is a surface-treated steel sheet having a film adhered to the surface. lid.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The present inventors conducted various studies on the shape near the opening after the opening of the easy-open lid, and provided undulations on the trunk side of the opening without making the vicinity of the opening particularly complicated. It has been found that when a hand, a finger, or the like is inserted, the safety can be dramatically improved by controlling the angle between the finger and the undulation. This avoids situations where inserting a hand, finger, etc. through the opening and pulling out the hand, finger, etc., could cause the hand, finger, etc. to catch on the edge of the opening or cause a cut. This is because it can be done.

FIGS. 1 and 2 show the basic shape of the present invention assuming a stainless steel can lid. FIG. 1 is a perspective view from above the can lid, and FIG. 2 is an enlarged cross-sectional view of an opening guide line portion when a cross section of a portion A in FIG. In the case of the easy-open lid of the stay-ion type, when the opening piece is pushed into the inside of the can by the tab 1, it breaks along the opening guide line 2, but after the break, the portion that was originally the opening guide line has a tip. Become sharp. This portion is easily caught by the hand or finger when trying to pull out after inserting the hand or finger through the opening 3, and it easily leads to the occurrence of scratches.

However, as shown in FIGS. 1 and 2, by providing the undulating portion 4 inside the can, the direction in which the hand or finger is pulled out is limited, so that the periphery of the opening to the hand or finger can be reduced. It is possible to reduce the force applied to the hands and fingers and reduce the occurrence of scratches.

In order to exhibit such a function, the distance L from the center of the scheduled opening portion (opening guide line) to the starting position 5 of the undulating portion is 1.5 mm or less, and the depth D is 1.5 mm. The above is desirable.

It is desirable that the angle α between the line connecting the vertex 6 of the undulating portion 4 from the center of the opening guide line 2 and the inner surface of the can lid is 45 degrees or more.

If these ranges are satisfied, the shape of the undulating portion 4, for example, the values of the curvatures R1, R2 and R3 shown in FIG. 2 may be any value, and a more complicated shape, for example, with a curvature. It may have a trapezoidal shape. The undulating portion is not required for the portion C in FIG. 1 where the opening piece remains, or for a portion where the can body portion is close and the can body portion plays a role equivalent to the undulating portion of the present invention.

There are various types of forming methods of the opening guide line. For example, scoring a trapezoidal shape, changing the width of the tip of the trapezoidal shape, changing the angle of the trapezoidal shape, etc.
Although the curvature may be added to the corner, the present invention can be applied to any shape of the opening guide line, and the safety can be improved.

Although the can lid is manufactured from a steel plate or an aluminum alloy plate, the present invention is applicable to any metal can lid material.
Steel sheet without surface treatment, steel sheet with surface treatment,
There is no problem even if it is used for an aluminum alloy plate or a metal plate having a resin film adhered to the surface thereof. Further, the type of surface treatment, the type of film, the method of attaching a film, and the like are not limited, and the present invention can also be used when various other types of surface treatment are performed.

[0016]

Embodiments of the present invention will be described below. FIGS. 3 to 5 show cross-sectional shapes near the opening guide line of a typical can lid to which the present invention is applied. Table 1 shows the evaluation results of the can lids to which the present invention is applied and the can lids that do not satisfy the conditions of the present invention. With respect to safety, a finger was inserted from the opening after the opening, and evaluation was made on a three-point scale of △, Δ, and × from the feeling when the finger was pulled out. Shapes A to E and H and I satisfy the conditions of the present invention and have no problem in safety, but shape F has undulations near the opening but the shape of the undulations does not satisfy the conditions of the present invention. There is a problem in safety, and shape G has no problem in the vicinity of the opening because there is no undulation and the present invention is not applied. As can be seen from these examples,
By applying the present invention, a can lid excellent in safety can be obtained.

[0017]

[Table 1]

[Brief description of the drawings]

FIG. 1 is a top view of a can lid of the present invention.

FIG. 2 is an explanatory cross-sectional view of the can lid of the present invention as viewed from a direction B.

FIG. 3 is a view near an opening guide line of a typical can lid to which the present invention is applied.

FIG. 4 is a view near the opening guide line of a typical can lid to which the present invention is applied.

FIG. 5 is a view near an opening guide line of a typical can lid to which the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tab 2 Opening guide line 3 Opening 4 Undulating part 5 Starting position 6 Vertex

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Ekuni Murakami 1-1, Tobata-cho, Tobata-ku, Kitakyushu-shi Nippon Steel Corporation Yawata Works F-term (reference) 3E093 AA13 BB01 CC01 EE01

Claims (9)

[Claims] An opening which is provided on a can lid, and which is opened along the scheduled portion when the can is used. Later high safety can lid. 2. The can with high safety after opening according to claim 1, wherein the undulation starts within 1.5 mm from the end of the portion to be opened and the depth of undulation is 1.5 mm or more. lid. 3. The post-opening safety according to claim 1, wherein an angle between a straight line connecting the center of the scheduled opening to the top of the undulation and a horizontal line of the can lid is 45 degrees or more. Tall can lid. 4. The highly safe can lid after opening according to claim 1, wherein the material of the lid provided with the opening scheduled portion is an aluminum plate. 5. The can lid having high safety after opening according to claim 1, wherein the material of the lid provided with the portion to be opened is an aluminum plate having a film adhered to the surface. 6. The can lid with high safety after opening according to claim 1, wherein the material of the lid provided with the opening scheduled portion is a cold rolled steel plate. 7. The can lid with high safety after opening according to claim 1, wherein the material of the lid provided with the opening scheduled portion is a surface-treated steel plate. 8. The can lid having high safety after opening according to claim 1, wherein a material of a lid provided with a portion to be opened is a cold-rolled steel sheet having a film adhered to a surface thereof. 9. The can lid having high safety after opening according to claim 1, wherein the material of the lid provided with the opening to be opened is a surface-treated steel sheet having a film adhered to the surface.