WO2021241639A1

WO2021241639A1 - Can lid

Info

Publication number: WO2021241639A1
Application number: PCT/JP2021/020028
Authority: WO
Inventors: 正博塩谷; 理央宮下
Original assignee: 大和製罐株式会社
Priority date: 2020-05-28
Filing date: 2021-05-26
Publication date: 2021-12-02
Also published as: US20230082001A1; CN115697851A; TW202216545A; AU2021281838A1; EP4159636A1; JP2021187471A

Abstract

A can lid (1) is provided with: a score line (31) that is disposed on an outer circumferential edge side of a disk-shaped panel part (21); a rivet part (32) which is disposed in the panel part (21) and which is inwardly adjacent to the score line (31) in a radial direction of the score line (31); a tab (12) that has a mounting part (51) having a rivet hole (51a) and mounted to the rivet part (32), a tip part (52) contiguous to the mounting part (51), and a finger hook part (53) formed on an opposite side to the tip part (52) with the mounting part (51) therebetween; and an auxiliary score line (33) having a first portion (41a) that is formed in the panel part (21) and extends in a circular arc shape along the rivet part (32) inward the rivet part (32) in the radial direction of the panel part (21) and a second portion that is contiguous to the first portion, that, when a straight line passing the center of the rivet part and the tip of the tab is defined as a first straight line and a straight line passing the center of the rivet part and orthogonal to the first straight line is defined as a second straight line, extends in a direction along the second straight line, and that is located on the center side of the panel part relative to the second straight line.

Description

Can lid

The present invention relates to a can lid used for a can.

Conventionally, so-called fully open type can lids, which are fully open, are often used as can lids used for canning for food. For canned foods, the final product is formed by filling the can with the contents and then performing a retort treatment, and the internal pressure of the can becomes a negative pressure. However, as disclosed in Japanese Patent Application Laid-Open No. 2012-131518 and Japanese Patent Publication No. 2-502814, in recent years, even for cans having a positive internal pressure, a fully open type can lid can be used. Proposed.

Such a can lid is formed on the peripheral side of the panel portion and has an annular score line for partitioning the opening piece and an auxiliary score line formed around the rivet portion for attaching a tab for opening. There is. This auxiliary score line uses the tip of the tab as a fulcrum, the finger hook of the tab as the emphasis point, and the rivet part when the tab is lifted by hooking the finger on the finger hook of the tab in the initial stage of the tab opening operation. It breaks due to the second kind of rivet action as the point of action.

By breaking this auxiliary score line, the panel part around the rivet part is easily deformed, and the finger hook part of the tab is easily lifted. When the tab is further lifted from the state where the auxiliary score line is broken, the rivet is used as a fulcrum, the finger rest of the tab is used as the point of effort, and the tip of the tab is used as the point of action. The annular score line near the tip breaks. After that, as the finger hook portion of the tab is pulled upward, the annular score line is broken in the circumferential direction, and the opening piece is removed from the can lid.

Japanese Patent Application Laid-Open No. 2012-131518 Japan Special Table No. 2-502814 Gazette

In the case of a can with a positive internal pressure, the central part of the can lid swells like a dome due to the internal pressure of the container, and the tip of the tab is located on an inclined surface that inclines downward toward the outer peripheral side. There is a risk that the tip of the can will be displaced toward the outer periphery of the can lid and proper opening operation will not be performed.

Therefore, an object of the present invention is to provide a can lid having sufficient openness even when used for a positive pressure can.

According to one aspect of the present invention, the can lid is provided on the disk-shaped panel portion, the score line provided on the outer peripheral edge side of the panel portion, and the inside of the panel portion in the radial direction of the score line. A rivet portion adjacent to the rivet portion, a mounting portion having a rivet hole attached to the rivet portion, a tip portion continuous with the mounting portion, and a finger hook portion formed on the opposite side of the tip portion across the mounting portion. A tab having a Then, when the straight line passing through the center of the rivet portion and the tip of the tab is defined as the first straight line, and the straight line passing through the center of the rivet portion and orthogonal to the first straight line is defined as the second straight line, the second straight line is defined. It is provided with an auxiliary score line extending in a direction along the line and having a second portion located on the center side of the panel portion with respect to the second straight line.

According to the present invention, it is possible to provide a can lid having sufficient openness even when used for a positive pressure can.

FIG. 1 is a plan view showing the configuration of a can lid according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing the configuration of the can lid. FIG. 3 is a cross-sectional view showing a configuration of a main part of the can lid. FIG. 4 is a cross-sectional view showing the configuration of the panel portion used for the can lid. FIG. 5 is a cross-sectional view showing a configuration of a main part of a can in which the can lid is used and showing an example in which the can lid expands due to internal pressure. FIG. 6 is a cross-sectional view showing an example of a state when the tab is opened in an example in which the can lid expands due to internal pressure.

Hereinafter, the configuration of the can lid 1 having the tab 12 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 6.
FIG. 1 is a plan view showing the configuration of the can lid 1 according to the embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the configuration of the can lid 1. FIG. 3 is a cross-sectional view showing the configuration around the rivet portion 32 of the can lid 1, and FIG. 4 is a cross-sectional view showing the configuration of the auxiliary score line 33 provided on the panel portion 21. 5 and 6 are cross-sectional views showing the configuration of the can 100 in which the can lid 1 is used, and the panel portion 21 of the can lid 1 is in a dome-shaped bulging state. Note that FIG. 5 shows the configuration before the opening operation by the tab 12, and FIG. 6 shows the configuration at the time of the opening operation by the tab 12.

As shown in FIGS. 1, 2, 5, and 6, the can lid 1 is, for example, a so-called fully open type with a fully open surface. As shown in FIGS. 5 and 6, the can lid 1 discharges the contents of the can 100 containing beverages such as retort foods, carbonated drinks and alcoholic drinks as contents from the inside of the can 100 to the outside. It is a member constituting the opening for the purpose. The can lid 1 is integrally assembled with the can body 101 of the can 100 by winding. As a result, in the can 100, the can lid 1 and the can body 101 are airtightly fixed by the winding portion 100a.

The can 100 is, for example, a positive pressure can having a positive pressure inside. The can 100 may be a two-piece can or a three-piece can. The contents are not limited to foods and beverages, and may be other than foods and drinks. That is, various contents enclosed in the can 100 can be applied.

As shown in FIGS. 1 and 2, the can lid 1 includes a can lid main body 11 and a tab (can lid tab) 12. The can lid 1 is manufactured by pressing a metal plate to mold the can lid main body 11 and the tab 12 in a separate process, and then fixing the tab 12 to the panel portion 21. Examples of the metal plate for forming the can lid main body 11 include an aluminum alloy plate having a resin film formed on its surface, a surface-treated steel plate, and the like. Examples of the metal plate for forming the tab 12 include an aluminum alloy plate and the like.

As shown in FIGS. 1 to 3, 5 and 6, the can lid main body 11 has a panel portion 21, an annular groove portion 22 provided on the outer peripheral edge of the panel portion 21, and an outer peripheral edge of the annular groove portion 22. The flange portion 23 provided in the above is provided.

As shown in FIGS. 1 to 4, the panel portion 21 is configured in a disk shape. The panel portion 21 includes a score line 31, a rivet portion 32, an auxiliary score line 33, a protection portion 34, and a finger insertion recess 35. Further, the panel unit 21 may have a display unit 36 or the like in Braille or the like for displaying the contents of the can 100. Further, the panel portion 21 may have convex portions or concave portions for product identification, design, reinforcement, and the like.

As shown in FIG. 6, the score line 31 is broken by the opening operation of the tab 12. The score line 31 is broken to form an opening of the can lid 1 in the panel portion 21. In other words, the score line 31 surrounds a region that becomes an opening piece when the opening of the can lid 1 is formed. Since the can lid 1 in the present embodiment is a fully open type, the score line 31 is formed in a circular shape or a substantially circular shape, for example, as shown in FIG. Then, when the score line 31 is broken, as shown in FIG. 6, the score line 31 of the panel portion 21 is formed by using the portion inward in the radial direction of the score line 31 of the panel portion 21 as an opening piece together with the rivet portion 32. It can be removed from the outer part in the radial direction.

The score line 31 is a groove forming a fragile portion that breaks a part of the panel portion 21 in the shape of an opening by an external force. As shown in FIG. 3, the score line 31 is, for example, a wedge-shaped groove provided on the outer surface of the panel portion 21, and a part of the panel portion 21 is formed thinly by the score line 31. Here, the outer surface of the panel portion 21 is a main surface exposed to the outside when the can lid 1 is provided on the can body 101 of the can 100, that is, a surface constituting the upper surface of the can 100.

The score line 31 is arranged in the protection unit 34, for example. The score line 31 is not limited to a circular shape. For example, the score line 31 is formed in an arc shape that is partially intermittent, and most of the panel portion 21 is opened, and the opened opening piece is continuous with the panel portion 21. It may be configured to be used.

As shown in FIGS. 1 to 3, 5 and 6, the rivet portion 32 is provided on one main surface of the panel portion 21, specifically, on the outer surface of the panel portion 21. The rivet portion 32 is provided on the outer peripheral edge side of the panel portion 21 and on the central side of the score line 31. That is, the rivet portion 32 is provided adjacent to the score line 31 inward in the radial direction of the score line 31.

The rivet portion 32 is configured in a columnar shape protruding from one main surface of the panel portion 21. The rivet portion 32 is formed by drawing a part of the panel portion 21 into a cylindrical shape. Further, the rivet portion 32 fixes the tab 12 to the panel portion 21 by caulking after arranging the tab 12. In addition, in FIGS. 1 to 3, FIG. 5 and FIG. 6, the rivet portion 32 shows a state after caulking.

As shown in FIGS. 1 to 4, the auxiliary score line 33 is formed in the vicinity of the rivet portion 32 of the panel portion 21. The auxiliary score line 33 is partially broken when the tab 12 is opened. The auxiliary score line 33 includes, for example, a main score line 41 and a sub score line 42 parallel to the main score line 41 provided on the opposite side of the main score line 41 from the rivet portion 32.

The main score line 41 is a groove constituting a fragile portion that breaks a part of the panel portion 21 in the shape of an opening by an external force. The main score line 41 is, for example, a wedge-shaped groove provided on the outer surface of the panel portion 21. A part of the panel portion 21 is formed thinly by the main score line 41. As shown in FIG. 6, the main score line 41 breaks during the opening operation of the tab 12 to enable the rivet portion 32 to move upward.

As shown in FIG. 4, the main score line 41 is a pair of a first site 41a, a pair of second sites 41b continuous with the first site 41a, and a pair of third sites continuous with each of the pair of second sites 41b. 41c and. The main score line 41 is continuous with a first site 41a, a pair of second sites 41b, and a pair of third sites 41c.

As shown in FIG. 4, the first portion 41a extends inward in the radial direction of the panel portion 21 of the rivet portion 32 in an arc shape along the rivet portion 32. In the first portion 41a, the straight line passing through the center of the rivet portion 32 and the tip of the tab 12 is defined as the first straight line X, and the straight line passing through the center of the rivet portion 32 and orthogonal to the first straight line X is defined as the second straight line Y. , Is arranged inward in the radial direction of the can lid 1 from the second straight line Y. That is, the radius of curvature of the first portion 41a is set to have a larger diameter than the radius of the rivet portion 32 before caulking.

As shown in FIG. 4, the second part 41b is continuous with the first part 41a and extends in the direction along the second straight line Y, respectively. The second portion 41b is formed, for example, linearly. The continuous portions of the first portion 41a and the second portion 41b are formed, for example, in an arc shape having a predetermined radius of curvature. The second portion 41b is arranged inward in the radial direction of the can lid 1 with respect to the second straight line Y. Preferably, the distance between the second portion 41b and the second straight line Y in the first straight line X direction is in the range of 0.2 to 2.0 mm. As shown in FIG. 4, each of the third portion 41c is continuous with the second portion 41b and bends in a direction away from the second straight line Y. The third portion 41c is formed, for example, in the shape of a plurality of arcs having different radii of curvature having a center of curvature inward in the radial direction of the can lid 1 with respect to the second straight line Y. The third portion 41c is arranged inward in the radial direction of the can lid 1 with respect to the second straight line Y.

The sub-score line 42 is provided inward in the radial direction of the panel portion 21 with respect to the second straight line Y of the main score line 41. The sub-score line 42 is formed parallel to the main score line 41. The sub-score line 42 is, for example, a wedge-shaped groove provided on the outer surface of the panel portion 21. The sub-score line 42 is formed to be shallower than the depth of the main score line 41. That is, the thickness of the portion of the panel portion 21 where the sub-score line 42 is provided is formed to be thicker than the thickness of the portion of the panel portion 21 where the main score line 41 is provided. A part of the panel portion 21 is formed thinly by the sub-score line 42.

As shown in FIGS. 2 to 6, the protective portion 34 is formed by folding back the panel portion 21 in an annular shape. The protective portion 34 is formed, for example, by being bent inward in the radial direction from the outer peripheral edge of the panel portion 21 and being folded back four times in the radial direction from the rivet portion 32. That is, the protective portion 34 is formed by arranging the panel portions 21 in five layers. The score line 31 is formed on the third layer of the panel portion 21 which is the protection portion 34.

The protection unit 34 operates the tab 12 to open, and when the score line 31 breaks, the protection unit 34 has an outer protection unit 34a that protects the inner peripheral edge of the portion existing in the can body 101 of the panel unit 21 that has broken at the score line 31 and the score. It constitutes an inner protective portion 34b that protects the outer peripheral edge of a portion (opening piece) of the panel portion 21 broken by the wire 31 from the can body 101. The outer protective portion 34a is composed of a three-layer panel portion 21 and exists on the inner peripheral edge of the panel portion 21 in which the folded portion is open. The inner protective portion 34b is composed of a three-layer panel portion 21, and the folded portion is located on the outer peripheral edge of the portion away from the opening of the panel portion 21.

In other words, as shown in FIG. 3, the protective portion 34 includes the upper layer 34c formed by the folded first and second layer panel portions 21 located on the outer surface side of the can lid 1 and the can lid 1. The lower layer 34d formed by the folded fourth and fifth layer panel portions 21 located on the inner surface side of the above, and the folded third layer panel portion located between the upper layer 34c and the lower layer 34d. It has an intermediate layer 34e formed by 21. The outer protective portion 34a is formed by the upper layer 34c and a part of the intermediate layer 34e, and the upper layer 34c is located above the score line 31 and functions as a protective portion after the score line 31 is broken. The inner protective portion 34b is formed by a part of the intermediate layer 34e and the lower layer 34d, and the lower layer 34d is located below the score line 31 and functions as a protective portion after the score line 31 is broken.

The finger insertion recess 35 is located below the rear end on which the finger of the tab 12 is hung, and is recessed from the outer surface of the panel portion 21.

The groove portion 22 is an annular recess that is continuously provided on the outer peripheral edge of the panel portion 21 and protrudes toward the can body when fixed to the can body. The groove portion 22 has a function of improving the pressure resistance of the can lid 1.

The flange portion 23 is wound around the open end of the can body 101. The flange portion 23 is provided with a resin layer for sealing on the surface that comes into contact with the can body 101.

As shown in FIGS. 1 to 3, the tab 12 includes a mounting portion 51, a tip portion 52, and a finger hook portion 53. The tab 12 is integrally formed with a mounting portion 51, a tip portion 52, and a finger hook portion 53. The tab 12 is opened by a finger or the like hung on the finger hook portion 53, so that the tip portion 52 presses a portion radially inwardly adjacent to the score line 31 of the panel portion 21 so that the score line 31 is formed. Break.

As shown in FIG. 3, the mounting portion 51 is formed in a plate shape and has a rivet hole 51a. The mounting portion 51 is continuous with the tip portion 52 and the finger hook portion 53. The rivet hole 51a is formed to have an inner diameter into which the rivet portion 32 can be inserted. The rivet portion 32 inserted into the rivet hole 51a is caulked, so that the mounting portion 51 is fixed to the panel portion 21 by the rivet portion 32.

The tip portion 52 is formed on the tip side of the tab 12. The tip portion 52 is configured such that the shape of the tip is an arc shape or a polygonal shape. The tip portion 52 is formed, for example, by double bending the outer peripheral edge excluding the tip.

The finger hook portion 53 is a portion on which a finger is hung to lift the tab 12 when the tab 12 is opened. As shown in FIGS. 1 and 2, for example, the finger hook portion 53 includes the ring hole 53a and is formed in an annular shape. As a specific example, the finger hook portion 53 is configured in a rectangular frame shape having an arcuate corner portion. The finger hook portion 53 is formed on the opposite side of the tip portion 52 with the mounting portion 51 interposed therebetween. When the tab 12 is attached to the panel portion 21, the rear end of the finger hook portion 53 faces the finger insertion recess 35. The finger hook portion 53 is formed, for example, by being bent so that the outer peripheral edge and the inner peripheral edge of the ring hole 53a are doubled.

In the can lid 1 configured in this way, as shown in FIG. 4, the auxiliary score line 33 is located inward in the radial direction of the can lid 1 with respect to the second straight line Y passing through the center of the rivet portion 32. Therefore, even in a positive pressure state in which the can lid 1 swells in a dome shape with the central portion of the can lid 1 as the apex, the lever action when the tab 12 is lifted can be reliably applied. That is, it is possible to prevent the tip portion 52 of the tab 12 from being displaced toward the outer peripheral side of the can lid 1 when the tab 12 is opened. Therefore, when the tab 12 is opened, the tip of the tip 52 can press a portion adjacent inward in the radial direction of the score line 31 of the panel 21, and an appropriate opening operation by the tab 12 can be performed. It can be carried out. Therefore, the can lid 1 can improve the openness of the can even if it is a positive pressure can, depending on the shape of the auxiliary score line 33 and the positional relationship between the rivet portion 32 and the auxiliary score line 33.

As described above, according to the can lid 1 according to the embodiment of the present invention, the can lid 1 has sufficient openness even when used for a positive pressure can.

The present invention is not limited to the above-described embodiment. For example, in the above-mentioned example, the configuration in which the auxiliary score line 33 is formed linearly has been described as an example in which the second portion 41b of the main score line 41 extends in the direction along the second straight line Y. Not limited to. The second portion 41b may be curved rather than linear as long as it can be approximated to extend in the direction along the second straight line Y. When the second portion 41b is curved, the radius of curvature of the second portion 41b is set to be an arc shape larger than the radius of curvature of the first portion 41a and the third portion 41c.

Further, in the above-mentioned example, the can lid 1 has been described as an example of being used for a positive pressure can, but the present invention is not limited to this, and the can lid 1 may be used for a negative pressure can.

The present invention is not limited to the above embodiment, and can be variously modified at the implementation stage without departing from the gist thereof. In addition, each embodiment may be carried out in combination as appropriate, in which case the combined effect can be obtained. Further, the above-described embodiment includes various inventions, and various inventions can be extracted by a combination selected from a plurality of disclosed constituent requirements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, if the problem can be solved and the effect is obtained, the configuration in which the constituent elements are deleted can be extracted as an invention.

1 ... can lid, 11 ... can lid body, 12 ... tab (can lid tab), 21 ... panel part, 22 ... groove part, 23 ... flange part, 31 ... score line, 32 ... rivet part, 33 ... auxiliary score line , 34 ... Protective part, 34a ... Outer protective part, 34b ... Inner protective part, 34c ... Upper layer, 34d ... Lower layer, 34e ... Intermediate layer, 35 ... Finger insertion recess, 36 ... Display part, 41 ... Main score line, 41a ... 1st part, 41b ... 2nd part, 41c ... 3rd part, 42 ... Subscore line, 51 ... Mounting part, 51a ... Rivet hole, 52 ... Tip part, 53 ... Finger hook part, 53a ... Ring hole, 100 ... Can, 100a ... Winding part, 101 ... Can body.

Claims

With a disk-shaped panel
The score line provided on the outer peripheral edge side of the panel portion and
A rivet portion provided on the panel portion and adjacent inward in the radial direction of the score line, and a rivet portion.
A mounting portion having a rivet hole attached to the rivet portion, a tip portion continuous with the mounting portion, and a tab having a finger hook portion formed on the opposite side of the tip portion across the mounting portion.
A first portion formed in the panel portion and extending in an arc shape along the rivet portion in the radial direction of the panel portion of the rivet portion, and a rivet portion continuous with the first portion. When the straight line passing through the center of the tab and the tip of the tab is set as the first straight line and the straight line passing through the center of the rivet portion and orthogonal to the first straight line is set as the second straight line, the direction along the second straight line is set. An auxiliary score line that extends and has a second portion located on the center side of the panel portion with respect to the second straight line.
Can lid with.
The can lid according to claim 1, wherein the distance between the second portion and the second straight line in the extending direction of the first straight line is set in the range of 0.2 to 2 mm.