JP2006176147A - Easily-unsealable can lid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily-unsealable can lid having a finger-inserting recess in a panel part in a vicinity of a lower side of a finger-hooking part of a tab which is capable of sufficiently ensuring the depth and the size of the finger-inserting recess without degrading the forming property of the can lid. <P>SOLUTION: In the easily-unsealable can lid to be opened by placing a finger tip in a finger-inserting recess 10 of a panel part 2 and pulling a finger-hooking part 6a of a tab 6 upwardly, inclined faces 10b, 10c to surround the circumference of a bottom face 10a of the finger-inserting recess 10 having the bottom face 10a substantially parallel to a panel surface are formed continuous to a plurality of stages of inclined faces 10b, 10c of different angles of inclination so that the inclination of a lower stage 10b is gentler than that of an upper stage 10c. <P>COPYRIGHT: (C)2006,JPO&NCIPI

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 opening piece from the can lid. Steion tab-type can lids that partially open as part of the mouth are often used, and with such easy-to-open can lids, it is easy to hold the finger when lifting 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 hooking portion of the tab (see, for example, Patent Documents 1 and 2 below).
JP 2000-159228 A JP 2002-59928 A

  By the way, with regard to the easy opening can lid having the above-mentioned recess for finger insertion, in recent years, the depth and size of the finger insertion recess have been increased more than ever in order to make it easy to place a finger on the tab not only with the index finger but also with the thumb. Increasing the size is also under consideration. However, when the size (area of a portion having a depth greater than or equal to the predetermined depth) is to be expanded in a state where the depth of the finger insertion recess formed in the panel portion of the can lid is sufficiently secured, The range that can be expanded is limited in view of stackability (stackability) and the like.

  That is, when trying to expand the width of the finger insertion recess in the radial direction of the can lid, if it is enlarged so as to be too close to the peripheral edge of the panel portion, the pressure resistance of the can lid will be reduced, while When enlarging so that it goes too far downward, when the can lids are overlapped with each other, the finger insertion recess of the upper can lid and the finger hooking portion of the tab of the lower can lid overlap, so that the bottom surface of the finger insertion recess Or the bottom surface of the inclined surface is rubbed and damaged, and stackability (stackability) deteriorates, causing troubles in cutting out the can lid when supplying a large number of can lids to the winding device continuously. There is a possibility.

  Therefore, when the width of the finger insertion recess is expanded in the circumferential direction of the can lid without expanding in the radial direction of the can lid, the recess has a planar shape and a long shape in the circumferential direction of the can lid. When trying to secure a sufficient depth in the wide range of the recess, the inclined surface that extends diagonally upward from the bottom surface of the recess becomes steep near the end of the recess in the circumferential direction of the can lid, and the bottom surface and the inclined surface of the recess The degree of bending at the connecting portion increases (the connecting R shape at the connecting portion has a small diameter). As a result, when the can lid is press-molded, the moldability in the vicinity of the connecting portion between the bottom surface of the finger insertion recess and the inclined surface may be deteriorated, resulting in partial thinning and deterioration of the inner surface of the can lid. There is.

  An object of the present invention is to solve the above-described problems. Specifically, a can can be provided for an easy-to-open can lid in which finger insertion recesses are formed in the panel portion in the vicinity of the lower part of the tab-fitting portion of the tab. It is an object to ensure sufficient depth and size of the finger insertion recess without deteriorating the moldability of the lid.

  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 inclination angle surrounding the periphery of the bottom surface of the finger insertion recess having a bottom surface substantially parallel to the panel surface is such that the inclination angle is lower at the lower stage than at the upper stage. It is characterized by being formed as a continuous series of different inclined surfaces.

  According to the easy opening can lid of the present invention as described above, the finger insertion concave portion of the panel portion is enlarged in the circumferential direction of the can lid so that the thumb can be easily hooked on the tab. Even if the depth can be sufficiently secured, by forming the inclined surfaces of the finger insertion recesses in a plurality of steps, the bottom surface and the inclined surface are compared with the case of one inclined surface continuous at the same inclination angle. The degree of bending at the connection portion (and the connection portion between the inclined surfaces) can be reduced. As a result, at the time of press molding of the can lid, molding damage at the connecting portion (and the connecting portion between the inclined surfaces) of the bottom surface of the finger insertion recess and the inclined surface can be kept low, and the partial thinness at that portion It is possible to prevent occurrence of deterioration and deterioration of inner surface quality.

  The easy-to-open can lid where the finger insertion recess is formed in the panel near the finger hook portion of the tab so that the depth and size of the finger insertion recess can be sufficiently secured without deteriorating the moldability of the can lid. As shown in the following embodiment as the best mode, the inclined surface surrounding the periphery of the bottom surface of the finger insertion recess having the bottom surface substantially parallel to the panel surface is lower than the upper level. This is realized by forming a plurality of inclined surfaces with different inclination angles so that the inclination becomes gentler.

  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. A tab 6 for opening operation formed separately from the main body portion in which the body 3 and the flange portion 4 are press-molded integrally is integrated with the substantially center of the substantially disk-shaped panel portion 2. It is fixed by riveting with a rivet portion 5 formed in a conventional manner. 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. In addition, a reinforcing projection 8a is formed on the portion that becomes the opening piece 8 in order to increase the rigidity of the portion.

  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 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 6c, it is easy to deform with only one metal plate. In addition, the finger-hanging portion 6a of the tab 6 is thinner than the other outer peripheral portion of the tab 6 in which the metal plate is bent to the lower surface side (for example, a thickness of about 1.0 mm). As a result, the clearance between the panel surface and the panel surface is made as large as possible to improve the finger grip.

  The panel portion 2 is formed with a wide and shallow panel recess 9 including a bottom surface 9a and an inclined surface 9b surrounding the tab 6 and the region of the opening piece 8 of the panel portion 2 so as to contain the region. As a result, 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, in the panel portion 2, a finger insertion concave portion 10 for facilitating the gripping of the finger hanging portion 6 a below the vicinity of the finger hanging portion 6 a of the tab 6 is connected to a part of the inclined surface 9 b of the panel concave portion 9. It is formed so as to be recessed further downward from the bottom surface 9 a of the panel recess 9.

  Further, the panel portion 2 has a pair of left and right projections 11 for preventing the tab 6 from rotating laterally with the rivet portion 5 as a pivot point, and a tab 11 on the lower side near the base portion of the finger hook portion 6a. 6 is formed so as to be fitted on the back side. In the can lid 1 of the present embodiment, the protrusion 11 has a two-stage structure of an upper part 11a and a lower part 11b, and the upper part 11a is fitted into a recessed part on the back side of the tab 6, and the lower part. The peripheral portion of 11b is an easily deformable portion that is deformed by the internal pressure of the can, and the upper surface of the lower portion 11b is a panel surface (panel recess) in a state where the can lid 1 is a single body (before being fastened and fixed to the can body). 9 and is in contact with the lower surface of the tab 6.

  According to the protruding part 11 having such an easily deformable part, when the can lid 1 is used for positive pressure beverage cans containing sparkling beverages such as carbonated drinks and beer, the contents are filled and sealed. Due to the internal pressure of the can of about 50 kPa to 300 kPa generated by the protrusion 11, the lower portion 11 b is deformed so that the peripheral portion bulges upward. However, the deformation of the lower portion 11 b of the protrusion 11 causes the tab 6 to deform. The finger-hanging portion 6a is lifted from the panel surface (the bottom surface 9a of the panel recess 9), and the finger-holding portion 6a of the tab 6 is easily hooked.

  By the way, in the can lid 1 as described above, in order to make it easy to put a finger on the finger-hanging portion 6a of the tab 6, the finger-insertion recess is formed in the lower panel portion 2 (the bottom surface 9a of the panel recess 9) in the vicinity of the finger-hanging portion 6a. In this case, the finger insertion recess 10 is formed so that its width is longer in the circumferential direction of the can lid than in the conventional case. The inclined surface surrounding the bottom surface 10a of the recess 10 substantially parallel to the panel surface (the bottom surface 9a of the panel recess 9) is formed from two successive inclined surfaces 10b and 10c as shown in FIGS. In addition, the lower inclined surface 10b is formed so that the inclination becomes gentler than the upper inclined surface 10c.

  In addition, with respect to such a finger insertion recess 10, the finger hooking portion 6 a of the tab 6 has an outer end portion (an end on the outer side in the can lid radial direction) of the inclined surface on the inner side in the can lid radial direction of the finger insertion recess 10. Thus, the upper inclined surface 10c of the two inclined surfaces 10b, 10c is positioned above the inclined surface 10c.

  According to such an easy opening can lid of this embodiment, the finger insertion concave portion 10 of the panel portion 2 is enlarged in the circumferential direction of the can lid, and the finger insertion concave portion as shown in FIGS. Since the depth is sufficiently secured in a wide range of 10, not only the fingertip of the index finger but also the fingertip of the thumb can be inserted into the fingering recess 10. By opening the fingertip 6a of the tab 6 with the fingertip inserted, the opening operation can be easily performed with a strong thumb.

  Moreover, even if the finger insertion recess 10 is sufficiently large and deep, the inclined surface following the bottom surface 10a of the finger insertion recess 10 is formed as the two inclined surfaces 10b and 10c, so that the same inclination is obtained. Compared with the case where the inclined surface is continuous at an angle, the degree of bending at the connecting portion between the bottom surface 10a and the inclined surface 10b (and the connecting portion between the inclined surfaces 10b and 10c) can be reduced. As a result, at the time of press molding of the can lid 1, molding damage at the bent portion of the finger insertion recess 10 (the connecting portion between the bottom surface 10a and the inclined surface 10b and the connecting portion between the inclined surfaces 10b and 10c) is kept low. Therefore, it is possible to prevent the occurrence of partial thinning or deterioration of the inner surface quality at the portion.

  Further, in this embodiment, the outer end portion (end portion on the outer side in the can lid radial direction) of the finger hanging portion 6 a of the tab 6 is the upper inclined surface 10 c of the inclined surfaces on the inner side in the can lid radial direction of the finger insertion recess 10. In other words, the finger hooking portion 6a of the tab 6 and the finger insertion recess 10 are arranged so as to slightly overlap each other when viewed from above (in plan view). Therefore, it is possible to secure a sufficient gap below the outer end portion of the finger-hanging portion 6a of the tab 6 to improve the finger-holding property, and when the can lids are overlapped with each other, The contact between the finger hook 6a of the tab 6 of the lower can lid and the finger insertion recess 10 of the upper can lid can be minimized, and the inner surface of the can lid can be damaged or the can lids can be stacked. Instability can be prevented.

  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, about the specific structure, in said Example, The inclined surface of the finger insertion recess has two upper and lower stages, but other multiple stages such as three stages may be used, and the can lid shown in the above embodiment has a protrusion 11 having a deformable part. Although it is for a positive pressure can equipped, it is not limited to such a thing and may be an easy opening can lid for a negative pressure can. The design can be changed as appropriate, such as a full open type easy opening 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. Sectional drawing along the can lid circumferential 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.

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 (lower stage of finger insertion recess) (Top) inclined 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 surrounding a periphery of the bottom surface of the finger insertion recess having a simple bottom surface is formed as a series of inclined surfaces having different inclination angles so that the inclination is gentler in the lower stage than in the upper stage. Easy-to-open can lid.   The outer end portion of the finger-holding portion of the tab is located above the uppermost inclined surface of the multiple-step inclined surfaces, with the inclined surface inside the can lid radial direction with respect to the finger insertion recess. The easy-to-open can lid according to claim 1.

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