JP2009173297A - Easily openable can lid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily openable can lid having a simple structure, which has a panel part capable of being easily opened over a wide range to facilitate taking-out of the content, and a tab-panel capable of being utilized safely as a handle, and surely prevented from being separated from the can lid. <P>SOLUTION: In the easily openable can lid, a score along the outer edge of the panel part 4 is formed into an approximately round by leaving partly a non-score part on the outer edge of the panel part, and the plane shape of the score at the end edge of the score is formed so as to be a small circular arc. Cutting of the score is advanced by taking up a tab 20, and a folding line for determining the final position where the opening piece 12 is bent at the final stage of opening, is provided. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to an easy-open can lid that is wound on the top plate side of a can container, and more particularly to a can lid that opens a wide area of a can-lid panel portion by a tab operation so that the contents can be easily taken out.

Canned food is made up by filling the contents of the can body with the top open, and then tightening and attaching the can lid and closing the can body opening. When taking out the contents, pull the tab on the can lid to Open the lid by tearing it off the score. In easy-to-open lids for cans that contain solids such as meat, fish, and fruits, the opening area is preferably as large as possible so that the contents can be taken out easily. When the pieces are scattered, it is dangerous and it is difficult to recover the resources. Therefore, a can lid of a type that does not separate the tab and the lid from the can body has been developed. On the other hand, the tab part is used as a handle to take out the contents, or it is heated outdoors and eats the contents directly. For example, in ramen, oden, yakitori, etc. To eat, tabs are very useful.
For these reasons, a can lid that uses the tab portion as a handle has been developed. Such can lids are disclosed in the following Patent Documents 1 and 2.

JP 2004-155480 A JP 2005-138852

However, the can lid shown in Patent Document 1 has an easy opening score that is only formed up to about half of the can lid panel, and a fold line that folds back with the opened panel portion as a handle is formed at the center of the panel portion. Eventually, only half of the can lid panel part can be opened, and it is inconvenient to take out the solid contents. Therefore, the can lid shown in Patent Document 2 has been developed as a technique for opening the can lid to a state almost close to full open.
However, the can lid of Patent Document 2 can open 50% to 99% of the score almost around the outer periphery of the panel, but the end of the score is connected to the fold line that folds back the panel. Therefore, there is a possibility that the panel is separated from the can lid by cutting the crease line due to the power of cutting the score. In order to prevent this separation, the breaking strength of the score part is increased, or beads are provided before and after the bending guide line, which causes the shape of the can lid to be complicated.
The present invention has been made in view of the above circumstances, and the panel portion of the can lid can be easily opened over a wide range, the contents can be easily taken out, and the tab can be used as a handle safely. An object of the present invention is to provide an easy-to-open can lid that can be used, can reliably prevent the tab panel from being separated from the can lid, and has a simple structure.

Corresponding to this purpose, the easy-open can lid of the present invention is a partial open type can lid having a panel portion on the inner side of an annular edge continuous to the winding flange, and the outside of the panel portion to which the tab is attached. An easy opening score that allows separation of the panel portion and the annular edge on the periphery is formed leaving a non-score portion that maintains continuity due to non-separation with the annular edge,
The radius of the end portion of the easy opening score near the non-score part is a curve smaller than the radius of the other part of the easy opening score,
It has a crease line that guides the folding of the panel portion formed in the non-score portion and separated by the easy opening score.

    According to the first aspect of the present invention, the opening area of the panel portion becomes a large portion of the panel portion, and by pulling up the tab, almost the entire area of the panel is opened, so that the contents can be taken out very easily. .

  Since the end of the score has a small radius curve or arc, the cutting of the easy opening score is surely stopped at this part, thus preventing separation of the tab and the opening piece from the can lid. Can do.

    According to the second aspect of the present invention, since the tab material is made of a material having a low thermal conductivity, the tab material does not reach a high temperature even when the contents are taken out from the heated canned food. Can be used as

    According to the invention of claim 3, since the end portion of the easy opening score is not connected to the crease line and separated, even if the cutting of the easy opening score proceeds, it is not transmitted to the crease line, Since the crease line is not cut, the tab and the opening piece are not separated from the can, and the crease line is kept in a healthy state, so it can be used as a guide for turning the panel part back to form a handle. Function.

    According to the invention described in claim 4, since the resistance to the incision is changed by gradually increasing the remaining thickness of the easy opening score at the end portion of the easy opening score, the user sets the end position of the easy opening score. The opening operation can be easily and reliably performed.

    According to the fifth aspect of the present invention, since the direction is reversed at the end portion of the easy opening score, the cutting of the easy opening score can be reliably stopped.

    According to the sixth aspect of the present invention, 99% or more of the panel portion of the can lid is opened by the easy opening score, so that a wide opening can be formed and the contents can be easily taken out.

    According to the seventh aspect of the present invention, since the remaining thickness of the score of the crease line is 0.15 to 0.25 mm, the panel for forming the handle can be easily folded.

The details of the present invention will be described below with reference to the drawings.
In FIG. 1, 1 is a can, and the can 1 has a can body 2 with an open top and a can lid 3 that closes the top open portion of the can 2 and is filled with the contents. It is manufactured by winding the curl 6 of the can lid 3 around the flange portion of the body 2 and closing the upper end open portion.

As shown in FIG. 2, the can lid 3 has a generally disc shape as a whole, and has a disc-shaped panel portion 4 perpendicular to the center line 10 of the can body at the center portion. An annular plate-like annular edge 5 is provided at the periphery, and a curl 6 rises at the outer periphery of the annular edge 5. The panel part 4 of FIG. 2 is the object of opening. An easy opening score 8 is provided at the boundary between the panel portion 4 and the annular edge portion 5. That is, the inside of the annular line portion 5 constitutes the panel portion 4.

The panel portion 4 is rotated substantially once around the panel portion 4 leaving the non-easy opening score portion 9 from the opening start region 13 to the opening end region 14 in the pulling direction 21 forming a straight line in a plan view of the tab 13 described later. An easy opening score 8 is formed, and a secondary score 11 is formed along the easy opening score 8 inside the easy opening score 8. The part inside the easy opening score 8 of the panel part 4 is a part which becomes a panel part which is a part separated by the easy opening score, that is, the opening piece 12. A wide opening can be obtained when the area of the opening piece 12 as the panel portion is 99% or more of the area of the panel portion 4. FIG. 5 shows a numerical example when the area of the opening piece 12 as the panel portion is 99% of the area of the panel portion 4.

As described above, the easy opening score 8 is formed in an arc shape having a radius R along the outer peripheral edge on the opposite side of the panel portion 4 together with the left score 8a and the right score 8b divided into two left and right hands in the opening start region 13. In the opening end region 14, the end portions 15 of the left and right scores 8 a and 8 b (in FIG. 2, the end portion 15 is surrounded by a two-dot chain line) are located facing the non-easy opening score portion 9. .
The end portion 15 having the radius r of both the left and right scores 8a and 8b starts at the end entrance portion 16 and reverses its direction at the center inversion portion 17 and then ends at the end 18. The radius r of the terminal portion 15 of both the left and right scores 8a and 8b is smaller than the radius R of the other portions.
The non-easy opening score portion 9 is located between both ends 15 of the left and right scores 8a and 8b facing each other, and the non-easy opening score portion 9 has a crease line score 22 orthogonal to the pulling direction 21 of the tab 20. Is formed.

The end portion 15 of the easy opening score 8 and the crease line score 22 are not connected and are discontinuous. It should be noted that the resistance of the end portion 15 is not constant over the entire length, and the resistance to cutting gradually increases from the end entrance 16 to the end 18.
In this example, the remaining thickness of the score is gradually increased in each portion in order to change the resistance value against the cutting. In this embodiment, as shown in FIG. 0.09 to 0.11 mm, preferably 0.10 mm, the reversing portion 17 is 0.17 to 0.19 mm, preferably 0.18 mm, and the end 18 is 0.24 to 0.26 mm, preferably 0.25 mm.

The remaining thickness of the score is processed to be almost constant so that the easy opening score 8 can be easily opened until just before the end portion 15.ス コ ア, the score remaining thickness of the small-diameter r portion at the end of the score is gradually increased so that the cutting of the easy opening score 8 is surely stopped at the end portion 15 and the non-easy opening score portion 9 is not cut. This is very important.

A tab 20 is attached to the panel portion 4 by a rivet 23 in the vicinity of the opening start region 13, and the front end portion of the tab 20 forms a pointed tip 27, just above the branch point of the left and right scores 8 a and 8 b of the easy opening score 8. It is arranged to be.
A vent main score 24 and a vent sub-score 25 are provided immediately below the rivet 23, and a concave panel 28 in which the panel portion 4 is recessed inward is provided immediately below the pull ring 26 of the tab 20. 26 provides a gap for inserting a finger. The pull ring 26 may be made of aluminum, but in this embodiment, the pull ring 26 is made of a material having low thermal conductivity, such as stainless steel.

When opening the can 1 configured as described above, when the pull ring 26 of the tab 20 is pulled up, the tip 27 rotates downward around the rivet 23 and pushes down the main score 8 in the opening start region 13 to open the initial opening. Form. If the tip 27 is pushed down as it is, the initial opening is enlarged. The bending of the panel portion 4 and the expansion of the initial opening by the depression of the tip 27 are smoothly performed because the vent main score 24 and the vent sub-score 25 guide.

When the opening of the initial opening is completed, when the pull ring 26 of the tab 20 is next lifted, the opening piece 12 of the panel portion 4 follows and is pulled up, and the left score 8a and the right score 8b of the easy opening score 8 are cut off and cut. . When this draw reaches the unsealing end area 14, the cutting resistance is gradually increased by gradually increasing the cutting resistance of the left end portion 8a of the easy opening score 8 and the end portion 15 of the right score 8b. 17 or end 18 is reached and the process ends. In this way, the can lid 3 is formed with a large opening from which the contents can be taken out.

Next, when the formed opening piece 12 is folded outward with the crease line score 22 as a guide, the tab 20 is positioned on the outermost side. Therefore, the outermost tab 20 is used as a handle to stabilize canning. Can take out the contents.

Even when the can is heated to warm the contents, there is an opening piece 12 that forms a long heat conduction path of the panel between the tab 20 and the can, and the amount of heat transfer is not so great, but the tab 20 is made of stainless steel or the like. If it is made of a material having a low thermal conductivity, it is possible to more easily prevent the tab 20 from reaching a high temperature.

(Example)
When a canned panel was implemented with the following configuration, the following results were obtained.

A Material of the can lid panel, plate thickness, remaining score 1 original plate thickness
Surface aluminum plate thickness 0.30mm
2 Score remaining thickness
Easy opening score 0.10 to 0.12 mm, preferably (0.105 mm)
Subscore 0.16-0.20 mm, preferably (0.18 mm)
Bent main score 0.08 to 0.11 mm, preferably (0.09 mm)
Vent minor score 0.15 to 0.20 mm, preferably (0.18 mm)
Crease line score 0.15 to 0.25 mm, preferably (0.19 mm)
When implemented with the above conditions,
3 Remaining thickness entrance portion (AA cross section) remaining thickness tA of the end of easy opening score 0.09 to 0.11 mm, preferably (0.10 mm)
Inversion part (BB cross section) remaining thickness tB 0.17 to 0.19 mm, preferably (0.18 mm)
Terminal (CC cross-section) remaining thickness tC 0.24 to 0.26 mm, preferably (0.25 mm)

B Implementation results When a can was made using the panel with the above conditions and an opening test was conducted,
(1) The score was easily cut to the end.
(2) Cutting was terminated at the terminal portion, and the cutting did not reach other portions.
(3) The cutting resistance gradually increased at the terminal portion, and the force could be adjusted by predicting that the cutting operation was almost finished.
(4) The opening piece could be correctly folded using the crease line score 22 as a guide, and the handle could be easily formed.

As is apparent from the above description, according to the present invention, the panel portion of the can lid can be easily opened over a wide range, the contents can be easily taken out, and the tab panel can be used safely as a handle. In addition, it is possible to reliably prevent the tab panel from being separated from the can lid and to obtain an easy-open can lid having a simple structure.

An explanatory perspective view showing a state where the can is opened. Top view of can lid Explanatory drawing which shows the main score and crease line score of a can lid panel part Explanatory drawing which shows the termination | terminus part of an easy opening score Explanatory drawing showing a numerical example of the panel part

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Canned food 2 Can barrel 3 Can lid 4 Panel part 5 Ring edge 6 Curl 8 Easy opening score 8a Left score 8b Right score 9 Non-easy opening score part 10 Centerline of can cylinder 11 Subscore 12 Opening piece 13 Opening start area 14 Opening end region 15 End portion 16 End entrance portion 17 Reversing portion 18 End portion 20 Tab 21 Pull direction 22 Crease line score 23 Rivet 24 Bent main score 25 Vent minor score 26 Pull ring 27 Point 28 Concave panel

Claims (7)

A partial open type can lid having a panel portion on the inner side of the annular edge portion, and having an easy opening score that enables separation of the panel portion and the annular edge portion on the outer peripheral edge of the panel portion to which a tab is attached. It is formed leaving a non-score part that maintains continuity by non-separation with the annular edge,
The radius of the end portion of the easy opening score near the non-score part is a curve smaller than the radius of the other part of the easy opening score,
An easy-open can lid characterized by having a crease line that guides the folding of the panel portion formed in the non-score portion and separated by the easy-open score.   The easy-open can lid according to claim 1, wherein the material of the tab is made of stainless steel.   The easy-open can lid according to claim 1 or 2, wherein the crease line is configured with a score separated from the score.   The easy-opening can lid according to any one of claims 1 to 3, wherein the easy-opening score is configured such that the remaining score increases in the end portion sequentially or stepwise toward the end of the score. .   The easy opening can lid according to any one of claims 1 to 4, wherein the easy opening score has a portion curled and inverted in direction at the end of the score.   6. The easy-open can lid according to claim 1, wherein an area of the panel portion is 99% or more of an area of the panel portion.   The easy-open can lid according to any one of claims 1 to 6, wherein the crease line is formed by forming a score with a remaining thickness of 0.15 to 0.25 mm on the panel portion.

Images