JP2009067407A - Easy-to-open can lid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a finger easily put on a tab by making the slant surface of a finger put-in recess have a steep slant as much as possible at the side of a tab finger-putting part without causing the deterioration of molding performance, related to an easy-to-open can lid in which the finger put-in recess is formed at a panel in the lower vicinity of the tab finger-putting part. <P>SOLUTION: In the slant surfaces 10b and 10c enclosing the bottom surface 10a of the finger insertion recess 10, the slant surface 10b at the tab finger hold part 6a side is slanted at a slant angle of 50°to 70° with respect to the bottom surface 10a, and the slant surface 10c at the opposite side of the tab finger hold part 6a is slanted at a slant angle of 5°to 40° with respect to the bottom surface 10a. The can lid has an approximately fan-like shape in a plan view expanding toward an outer circumferential margin of the panel at open angles α of both side margins of 45°to 120°. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a can lid that is fastened and fastened to a can body as an end wall on the top plate side of a can container such as a beverage can, and pulls up one end side of a tab riveted to the panel portion of the can lid as a finger-hanging portion. With regard to the easy opening can lid that performs the opening operation in the above, in particular, by forming a recess for inserting the finger in the panel portion in the vicinity of the lower portion of the tab finger-holding portion, it is easy to put the fingertip on the finger-holding portion of the tab during the opening operation. The present invention relates to an easy-to-open can lid.

Conventionally, in beverage can containers, tabs riveted to the panel portion of the can lid as an easy-to-open can lid (easy open end) that is fastened to the can body as an end wall on the top plate side of the can container By pulling up one end side of the can as a finger-hanging part, the part of the opening piece surrounded by the score line of the panel part of the can lid is pushed down into the can, and the panel of the can lid can be removed without separating the tab or the opening piece from the can lid. Steion tab-type can lids that partially open with a portion of the mouth as a drinking mouth are often used, and with such easy-to-open can lids, it is easy to hold the finger when pulling up the finger rest of the tab with the fingertip In order to achieve this, it is common practice to form a recess for inserting a finger in the panel portion below the vicinity of the finger-hook portion of the tab (see, for example, Patent Documents 1 and 2 below).
JP 2000-159228 A JP 2002-59928 A

  By the way, in the easy-to-open can lid having the above-mentioned concave portion for finger insertion, the depth of the finger insertion concave portion composed of the bottom surface and the inclined surface is increased, so that the space between the panel portion of the can lid and the finger hooking portion of the tab is increased. The larger the gap, the easier it is to put a finger on the tab hooking part. However, if the finger insertion recess is formed directly below the tab fingering part, the fingers of the upper lid can be When the insertion recess overlaps the finger hook of the tab on the lower can lid, the bottom surface of the finger insertion recess and the lower surface of the inclined surface are rubbed and damaged, and stackability (stackability) deteriorates. When the can lid is continuously supplied to the winding device, there is a possibility that trouble of cutting out the can lid may occur.

  Therefore, as disclosed in each of the above-mentioned patent documents, the gap between the panel portion of the can lid and the finger hook portion of the tab can be secured, and the finger insertion concave portion is not damaged so as not to impair the stackability. The depth is set within a predetermined range, and the finger rest of the tab is slightly overlapped with the inclined surface of the finger insertion recess. In such a case, if you try to hook the tab, When the finger comes into contact with the inclined surface of the finger insertion recess near the portion, it becomes difficult to place the finger on the tab.

  On the other hand, in order to keep the inclined surface of the finger insertion recess and the finger from coming into contact with each other as much as possible while keeping the depth of the finger insertion recess within a predetermined range, It is sufficient to make the inclination angle of the inclined surface of the insertion recess as steep as possible. However, if the inclination angle of the inclined surface of the finger insertion recess is made to be steep, the finger insertion recess will be reduced during press forming of the can lid. The formability in the vicinity of the connection portion between the inclined surface and the bottom surface of the steeply inclined surface may deteriorate, resulting in partial thinning or constriction at the portion, resulting in deterioration of the quality of the can lid. There is.

  An object of the present invention is to solve the above-described problems. Specifically, the easy-to-open can lid in which finger insertion recesses are formed in the panel portion near the lower part of the tab finger-holding portion. An object of the present invention is to form the inclined surface of the insertion recess on the side of the tab finger hanging portion as steeply as possible without deteriorating the formability so that the tab can be easily hooked.

  In order to solve the above-mentioned problems, the present invention has a tab for opening operation fixed to a panel portion of a can lid in which a score line for defining an opening piece is engraved, and a rivet portion. A finger insertion recess is formed in the panel near the lower end of the tab, away from the rivet, and an opening operation is performed by inserting the fingertip into the finger insertion recess in the panel and pulling up the tab. In the easy-to-open can lid, the inclined surface surrounding the periphery of the bottom surface of the finger insertion recess having a bottom surface substantially parallel to the panel surface, and the inclined surface on the tab finger hook side has an inclination angle of 50 with respect to the bottom surface. Inclined so as to be in the range of ° to 70 °, and the inclined surface opposite to the tab finger hanging portion is inclined so that the inclination angle with respect to the bottom surface is in the range of 5 ° to 40 °. The opening angle of both side edges of the surface is 45 ° to 120 ° And it is characterized in that it is formed in a substantially fan shape in a plan view such as to extend toward the panel outer periphery range.

  According to the easy opening can lid of the present invention as described above, the inclined surface on the side of the tab finger hanging portion is inclined at 50 ° to 70 ° with respect to the bottom surface in the finger insertion recess formed in the panel portion of the can lid. By making it relatively steep so as to be within the range, when placing a finger on the tab finger hanging part, the inclined surface of the finger insertion recess on the side of the tab finger hanging part is less likely to get in the way, Can be improved.

  Further, the inclined surface on the opposite side to the tab finger-hanging portion has a relatively gentle inclination so that the inclination angle with respect to the bottom surface is in the range of 5 ° to 40 °, and the opening angle of both side edges of the inclined surface is 45 °. Since it is formed in a substantially fan shape in a plan view so as to expand toward the outer peripheral edge of the panel portion in a range of ˜120 °, the panel portion on the opposite side of the tab finger hanging portion in the finger insertion recess when forming the can lid It is possible to smoothly transfer a lot of metal material from the outer periphery of the tab to the inclined surface on the tab finger hanging part side, and the metal at the connecting part between the inclined surface and the bottom surface that is steeply inclined on the tab finger hanging part side. The material can be secured, and it is possible to prevent the portion from being thinned or constricted.

  For the easy-to-open can lid where the finger insertion recess is formed in the panel near the tab finger rest, the inclined surface of the finger insert recess is as steep as possible on the tab finger rest side without degrading the formability. In order to make it easy to put a finger on a tab by forming it in an inclined manner, as specifically shown in the following embodiments as the best mode, a finger insertion recess having a bottom surface substantially parallel to the panel surface is provided. The inclined surface surrounding the periphery is inclined so that the inclined surface on the side of the tab finger hanging portion is in the range of 50 ° to 70 ° with respect to the bottom surface, and the inclined surface on the side opposite to the tab finger hanging portion is In a plan view in which the inclination angle with respect to the angle is 5 ° to 40 ° and the opening angle of both side edges of the inclined surface extends toward the outer peripheral edge of the panel portion in the range of 45 ° to 120 °. Realized by forming it in a fan-like shape .

  The easy-to-open can lid of the present embodiment is a steion tab type easy-to-open can lid used for a beverage can container. As shown in FIG. 1, the can lid 1 has a panel portion 2 and a counter sink portion. (The annular groove and the chuck wall following the outside) 3 and the flange portion 4 are integrally formed by pressing, and the opening operation tab 6 formed separately from the main body portion is substantially circular. The plate-like panel portion 2 is fixed by riveting at a rivet portion 5 integrally formed at substantially the center. Although not shown, an organic polymer sealing agent is applied and adhered to the back surface side of the flange portion 4 which is a portion to be fastened to the can body.

  The substantially disc-shaped panel portion 2 of the can lid 1 has a breakable score line 7 (in addition to the outer main score line 7 that breaks when opened, the inner sub-score line that does not break is a double line. Is partly engraved so as to be close to the rivet portion 5, and the region surrounded by the score line 7 (the main score line that breaks when opened) It is a part of the opening piece 8 pushed down inside, and the part between the both ends of the score line 7 becomes a hinge part which connects the panel part 2 and the opening piece 8 at the time of opening.

  With respect to the opening piece 8 of the panel part 2 surrounded by the score line 7, the opening operation tab 6 is located on the opposite side of the opening piece 8 with the rivet part 5 sandwiched between one end side thereof as a finger hanging part 6a, Riveted to the panel portion 2 by a rivet portion 5 formed substantially in the center of the panel portion 2 outside the area of the opening piece 8 so that the other end side is positioned above the opening piece 8 as a depressed portion 6b. Has been.

  In addition, the area | region containing the tab 6 and the opening piece 8 of the panel part 2 is formed in the surface dented one step shallower than the upper surface of the panel part 2 as the center panel part 9 enclosed by the low inclination wall, Thereby, the degree of protrusion of the tab 6 on the upper surface of the can lid is kept low, and the overall rigidity of the panel portion 2 is increased. Further, a reinforcing bead 8 a is formed in the portion that becomes the opening piece 8 by a concave bead that protrudes downward and a convex bead that protrudes upward inside the concave bead. Although not shown in the drawing, a reinforcing bead is formed by a concave bead that is recessed downward in a semicircular arc shape surrounding the rivet portion 5.

  In the center panel portion 9 of the panel portion 2, a finger insertion recess 10 for facilitating the gripping of the finger hanging portion 6 a is provided below the vicinity of the finger hanging portion 6 a of the tab 6 and a part of the inclined wall of the center panel portion 9. In a state of being connected, the center panel portion 9 is formed so as to be further recessed downward. The bottom surface 10a of the finger insertion recess 10 is a surface substantially parallel to the panel surface. In plan view, the bottom surface 10a is a horizontally long shape extending in a direction perpendicular to the central axis direction of the tab 6 and arc-shaped oval shapes (laces). Track shape).

  In the tab 6, the metal plate is bent to the lower surface side at the entire outer peripheral edge and the inner edge portion of the finger-hanging portion 6 a, and these portions are extremely rigid, but are riveted by the rivet portion 5. In the vicinity of the portion, it is easy to deform with only one metal plate. In addition, the tab 6a of the tab 6 protrudes slightly from the other outer peripheral portion of the tab 6 to provide a gap between the panel surface and the tab 6 in which the metal plate is bent to the lower surface side. Compared with the outer peripheral portion of the slab, the gap with the panel surface is further increased by being crushed so as to be thinner.

  By the way, in the can lid 1 as described above, a finger insertion recess 10 is formed in the center panel portion 9 of the panel portion 2 below the vicinity of the finger hanging portion 6a in order to make it easier to put a finger on the finger hanging portion 6a of the tab 6. However, in this embodiment, as shown in FIG. 2, the inclined surfaces 10b and 10c surrounding the periphery of the bottom surface 10a of the finger insertion recess 10 are steep on the inclined surface 10b on the tab finger hanging portion 6a side. As shown in FIG. 3, the inclined surface 10c opposite to the tab finger hanging portion 6a is a substantially fan-shaped gentle slope in a plan view that extends toward the outer peripheral edge of the panel portion 2, The inclined surfaces 10b and 10c are smoothly continuous.

  That is, in the can lid 1 of the present embodiment, the inclined surface 10b that is steeply inclined on the tab finger hanging portion 6a side has an inclination angle with respect to the bottom surface 10a in a range of 50 ° to 70 ° (specifically, 60 °). On the other hand, the inclined surface 10c which is a gentle inclined surface on the side opposite to the tab finger hanging portion 6a has an inclination angle with respect to the bottom surface 10a in a range of 5 ° to 40 ° (specifically 20 °). The opening angle α (opening angle of the fan) of both side edges of the inclined surface 10c that is substantially fan-shaped in plan view is 45 ° to 120 ° (specifically 60 °).

  In addition, about the finger insertion recessed part 10 of the can lid 1 of a present Example, specifically, the magnitude | size of the bottom face 10a is 2.6 mm in length (length of the center axis direction of the tab 6), and width (tab 6). The length in the direction perpendicular to the central axis direction) is 11.4 mm. Moreover, the size of the substantially fan-shaped gentle slope 10c on the side opposite to the tab finger hanging portion 6a is 8.8 mm in the vertical width (the length in the central axis direction of the tab 6), and the horizontal width (in the central axis direction of the tab 6). The maximum width in the direction orthogonal to the length of 23.9 mm.

  The depth of the finger insertion recess 10 (distance from the upper surface of the center panel portion 9 to the upper surface of the bottom surface 10a) is in a range of 1.1 to 1.5 mm (specifically, 1.45 mm). By doing so, it is possible to easily apply a finger to the finger-hanging portion 6a of the tab 6, and the moldability of the finger insertion recess 10 is not impaired. The radius of curvature of the connecting portion between the inclined surface 10b and the center panel portion 9 is in the range of 0.3 to 0.5 mm (specifically 0.4 mm), and the connecting portion between the inclined surface 10b and the bottom surface 10a. The curvature radius is set to a range of 0.7 to 0.9 mm (specifically, 0.8 mm).

  In addition, as for the arrangement relationship between the finger insertion recess 10 and the finger hooking portion 6a of the tab 6, the stackability when stacking the single can lids and the disconnectability when separating the stacked can lids are good, The finger insertion recess 10 and the tab finger hanging portion 6a are slightly overlapped so as to ensure sufficient finger gripping. For this purpose, the inclined surface 10b of the finger insertion recess 10 (with the center panel portion 9) The distance (the distance in the can lid radial direction) where the outer edge of the tab finger-hanging portion 6a overlaps with the outer edge (including the connection part) of the outer edge (the boundary between the center panel portion 9 and the connection) as a reference. The range is set to 2 to 0.8 mm (specifically, 0.4 mm).

  For example, as shown in FIG. 4, the finger insertion recess 10 is formed when the metal material is press-molded by the upper mold 21 and the lower mold 22 when the can lid is molded. Of the peripheral edge, the lower mold 22 is recessed only in a portion close to the gentle slope 10c on the side opposite to the tab finger-hanging portion 6a of the finger insertion recess 10, so that the restriction by the lower mold 22 is relaxed. The finger insertion recess 10 is formed by moving a portion of the metal material inward in the radial direction of the can lid.

  In the can lid 1 of the present embodiment, which is press-molded by such a method, as shown in FIG. 2, among the outer edge portions of the panel portion 2 extending in the circumferential direction, the tab finger hook portion of the finger insertion recess 10. A portion 2a adjacent to the inclined surface 10c opposite to 6a has a shape recessed downward (a shape recessed downward by a maximum of 0.4 mm) compared to the other portions.

  According to the easy opening can lid of the present embodiment as described above, the inclined surface 10b on the tab finger-hanging portion 6a side is formed by the finger insertion recess 10 formed in the panel portion 2 (center panel portion 9) of the can lid 1. When the finger is put on the finger rest portion 6a of the tab 6, the tab is inclined so that the inclination angle with respect to the bottom surface 10a is in a range of 50 ° to 70 ° (specifically, 60 °). The inclined surface 10b of the finger insertion recess 10 is less likely to get in the way on the finger-hanging portion 6a side, and the finger-holding property of the tab 6 can be improved.

  In this regard, if the inclination angle with respect to the bottom surface 10a is larger than 70 ° on the inclined surface 10b on the tab finger hanging portion 6a side, the moldability on the inclined surface 10b is deteriorated when the finger insertion recess 10 is formed. 10b and the bottom surface 10a may be thinned or constricted. On the other hand, if the angle of inclination with respect to the bottom surface 10a is less than 50 °, the inclined surface 10b may be formed when the finger 6 is hooked on the finger hook portion 6a of the tab 6. There is a risk of getting in the way.

  Further, according to the can lid 1 of the present embodiment, the inclined surface 10c on the opposite side of the tab finger-hanging portion 6a of the finger insertion recess is in the range of the inclination angle with respect to the bottom surface 10a of 5 ° to 40 ° (specifically 20 °). In order to achieve a relatively gentle inclination, and the opening angle α of both side edges of the inclined surface 10c is substantially fan-shaped so as to expand in the range of 45 ° to 120 ° (specifically 60 °). Therefore, at the time of molding the can lid 1, in the finger insertion recess 10, a large amount of metal material from the outer peripheral portion of the panel portion 2 on the side opposite to the tab finger hanging portion 6a is applied to the inclined surface 10b on the tab finger hanging portion 6a side. It is possible to make a smooth transition, and a sufficient metal material can be secured in the connecting portion between the inclined surface 10b and the bottom surface 10a that are steeply inclined on the tab finger hanging portion 6a side. Constriction or the like can be prevented from occurring.

  In this regard, when the inclination angle of the inclined surface 10c with respect to the bottom surface 10a is larger than 40 °, the metal material in the outer peripheral portion of the panel portion 2 is sufficiently transferred to the inclined surface 10b of the finger insertion recess 10 when the finger insertion recess 10 is formed. There is a risk that the connecting portion between the inclined surface 10b on the tab finger hanging portion 6a side and the bottom surface 10a may be thinned or constricted, while the inclined angle of the inclined surface 10c with respect to the bottom surface 10a is smaller than 5 °. However, similarly, there is a possibility that the metal material of the outer peripheral portion of the panel portion 2 cannot be sufficiently transferred to the inclined surface 10b of the finger insertion recess 10 when the finger insertion recess 10 is formed. There is a possibility that the connection between the inclined surface 10b and the bottom surface 10a may be thinned or constricted.

  Further, with respect to the opening angle α of both side edges of the inclined surface 10c, if the opening angle α is smaller than 45 °, there is a possibility that the amount of the metal material to be transferred to the inclined surface 10b on the tab finger hanging portion 6a side cannot be secured sufficiently. On the other hand, even if the opening angle α is larger than 120 °, it is difficult for the metal material to move near the side edge of the inclined surface 10c, and the metal material may not be effectively transferred.

  Further, in the can lid 1 of the present embodiment, a portion 2a of the outer edge portion of the panel portion 2 extending in the circumferential direction that is close to the inclined surface 10c on the opposite side of the tab finger hanging portion 6a of the finger insertion recess 10. Is recessed downward (up to 0.4 mm downward) compared to the other portions, but according to the can lid 1 of this embodiment, the finger insertion recess 10 The metal material of the outer peripheral portion of the panel portion 2 adjacent to the inclined surface 10c can be shifted inward in the can lid radial direction by the amount of the depression, and when the finger insertion recess 10 is formed, A sufficient metal material can be secured at the connecting portion between the inclined surface 10b and the bottom surface 10a, and the occurrence of thinning, constriction, or the like can be reliably prevented at that portion.

  As mentioned above, although one Example of the easy opening lid | cover of this invention was described, this invention is not limited only to said Example, For example, a steeon tub system as shown in said Example It is possible to change the design as appropriate, such as a full open type easy opening can lid as well as the easy opening can lid.

The top view which shows the whole can lid | cover about one Example of the easy opening can lid | cover of this invention. Sectional drawing along the can lid radial direction which expands and shows the outer-end part of the finger-hook part of a tab, and the vicinity of a finger insertion recessed part about the easy opening can lid shown in FIG. The top view which shows the state which looked at the part shown in FIG. 2 from upper direction. Explanatory drawing which shows an example of the shaping | molding state by the metal mold | die of a finger insertion recessed part.

Explanation of symbols

1 Can lid (easy opening can lid)
2 Panel portion 5 Rivet portion 6 Tab 6a (Tab) finger hook portion 7 Score line 8 Opening piece 10 Finger insertion recess 10a Bottom surface of finger insertion recess 10b Inclined surface 10c (of finger insertion recess) Inclination (of finger insertion recess) surface

Claims (2)

  A tab for opening operation is fixed to the panel portion of the can lid on which the score line for defining the opening piece is engraved with the rivet portion, and against the finger hook portion on one end side of the tab away from the rivet portion, Near the lower side, a finger insertion recess is formed in the panel part, and in an easy opening can lid where the finger is inserted into the finger insertion recess of the panel part and the finger hooking part of the tab is pulled up, the opening can can be opened substantially parallel to the panel surface. An inclined surface that surrounds the periphery of the bottom surface of the finger insertion recess having a simple bottom surface, and the inclined surface on the tab finger hanging portion side is inclined so that the inclination angle with respect to the bottom surface is in the range of 50 ° to 70 °. The inclined surface opposite to the tab finger hanging portion is inclined so that the inclination angle with respect to the bottom surface is in the range of 5 ° to 40 °, and the opening angle of both side edges of the inclined surface is in the range of 45 ° to 120 °. So that it expands toward the outer periphery of the panel Easy-to-open can lid, characterized in that it is formed in a substantially fan shape in terms view.   Of the outer peripheral edge portion of the panel portion of the can lid, a portion close to the inclined surface opposite to the tab finger hanging portion of the finger insertion recess is recessed downward compared to the other portions. Item 2. The easy-to-open can lid according to item 1.

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