JP2005138852A - Easily-openable can lid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make the breakage of a score part by operating a tab stop at the end of the sore without fail to prevent the rupture of a nonscore part on an easily-openable can lid, which has an opening piece, which occupies 50% or more to less than 99% of the area of a can lid panel and is opened by operating the tab as it is kept connected to the can (can lid). <P>SOLUTION: On the easily-openable can lid 1, the area of the opening piece enclosed with the score part 14 occupies 50% or more to less than 99% of the whole of the panel 2, and the opening tab 6 is fixed at a position that is opposite to the nonscore part (a part where the score part 14 is not formed) in the opening piece area and is near the score part 14. The score part 14 is formed in such a way that its break-resistant strength increases gradually (a residual thickness on the score part 14 increases gradually to expand a score width gradually) toward its end within a prescribed area near the nonscore part in the score part 14 formed along the outer edge of the panel 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an easy-to-open can lid (easy open end) that is fastened and secured to a can body as an end wall on the top plate side of the can container, and in particular, has an area of 50% or more and less than 99% of the panel portion of the can lid. The present invention relates to an easy-to-open can lid in which a portion of the opening piece of the panel portion is connected to a can (can lid) by operating a tab as an opening piece.

  It is a can lid that is fastened and fastened to the can body as an end wall on the top plate side of the can container, and it is easy to break the score part by operation with a tab without separately requiring tools such as a can opener About the so-called easy-open can lid that can be opened (easy open end), in the case of canned foods that contain liquids such as various beverages, a part of the panel portion of the can lid is partially used as a drinking mouth. An open easy can lid of the steion tab type that opens without disconnecting the tab or opening piece from the can (can lid) has been commonly used in the past. On the other hand, fruit, vegetables, fish In the case of canned foods containing solids (including gel-like ones) such as meat, jelly, water sheep pudding, pudding, etc., it is a fully open type that fully opens the panel of the can lid, Use the tab to Easy-to-open can lid as completely disconnected from the can (the can lid) is generally used conventionally substantially the entire panel section as mouthpiece with.

In addition, as for the fully open type easy opening lid, if the panel part is separated from the can and thrown away, there will be a problem in resource recovery and environmental beautification. In the easy can lid, by forming the score part long on the outer edge of the panel part so as to leave a non-score part on a part of the outer edge of the panel part without forming the score part on the entire periphery of the outer edge of the panel part, It has been conventionally known from the following Patent Document 1 that the panel portion is opened almost entirely with a part thereof connected to a can (can lid).
Japanese Utility Model Publication No. 6-47128

  By the way, in recent years, for example, there are several types of canned foods, such as canned fruit juice, which are mostly liquid but contain a small amount of small solids (including gels). For canned foods with such solids, a partial open type easy-to-open can lid that opens a part of the panel part has been conventionally used in the same manner as in the case of normal canned beverages (content is liquid only). In such a partial open type easy opening can lid, it is difficult to take out the solid content of the contents because the area of the opening is small. Since it remains in the vicinity of the opening in the can, the opening piece becomes an obstacle, making it more difficult to take out the solid content.

  For such problems, use a full-open type easy-to-open can lid that opens almost the entire surface of the panel part, or the full-open type has an opening that is too large and spills liquid during the opening operation. Considering that it becomes difficult, it is considered to use a half-open type easy opening can lid that opens approximately half of the panel part, but more than half of the entire panel part of the can lid (such as For example, the above-mentioned patent may be used so that the panel portion (portion corresponding to the opening) that becomes the opening piece is not separated from the can and discarded even when the region of 50% or more and less than 99% is opened. As described in Document 1, it is necessary to open the can lid in a state where the portion to be the opening piece is connected to the can (can lid).

  However, in the easy opening can lid that opens more than half of the panel portion of the can lid, even when the non-score portion is left on the outer edge of the panel portion, when the score portion is broken by the operation of the tab, that is, When a part of the score part is initially broken by pulling up the tab and then the remaining score part is broken by pulling the tab backward and upward, the score part breaks at an accelerated rate. The end of the part may not stop breaking and may reach the non-score part, and as a result, the non-score part will tear, and the opening of the can lid opens more than expected, depending on the case There is also a possibility that the panel portion is completely separated from the can (can lid).

  An object of the present invention is to solve the above-described problems. Specifically, an area of 50% or more and less than 99% of the panel portion of the can lid is used as an opening piece, and the panel portion is operated by tab operation. For easy-to-open can lids that open in a state where the opening piece is connected to the can (can lid), the score portion breakage due to the tab operation is securely stopped at the end of the score portion, and the non-score It is an object to prevent tearing at the portion.

  In order to solve the above-mentioned problems, the present invention is formed so that the score part along the outer edge of the panel part is formed over a half circumference of the outer edge of the annular panel part so as to leave a non-score part on the outer edge of the panel part. Therefore, the area of the opening piece surrounded by the score part occupies 50% or more and less than 99% of the entire panel part, and the position close to the score part on the opposite side of the non-score part of the area of the opening piece In the easy-to-open can lid to which the opening operation tab is fixed, the score portion is gradually moved toward the end portion in a predetermined range close to the non-score portion of the score portion along the outer edge of the panel portion. Further, it is formed so as to increase the breaking strength.

  According to the easy opening can lid of the present invention as described above, even if the score portion formed continuously over half the circumference of the outer edge of the annular panel portion is continuously broken during the opening operation with the tab, the end of the score portion As the score part gradually becomes difficult to break as it approaches the part, the momentum at which the breaking of the score part progresses is weakened, so the breaking of the score part can be reliably stopped at the end of the score part. Thus, it is possible to reliably prevent the non-score portion from tearing following the breaking of the score portion. As a result, in the easy opening can lid that opens more than half the area of the panel portion of the can lid, the opening portion of the can lid can be accurately opened as planned, and the portion that becomes the opening piece of the panel portion can be ( (Can lid) can be securely connected.

  Easy-to-open can lid such that the area of 50% or more and less than 99% of the panel portion of the can lid is an opening piece, and the portion of the opening piece of the panel portion is connected to the can (can lid) by operating the tab The following embodiment is the best mode for the purpose of ensuring that the breaking of the score part due to the tab operation stops at the end of the score part and that no tearing occurs in the non-score part. As specifically shown, the score portion is formed in a predetermined range close to the non-score portion of the score portion along the outer edge of the panel portion so that the breaking resistance gradually increases toward the end portion. It was realized by doing.

  The easy opening can lid 1 of this embodiment is press-formed from a thin plate of aluminum alloy, and as shown in FIGS. 1 (A) and 2, a panel portion 2, an annular edge portion 3, and a counter sink portion. A tab 6 for opening operation formed separately from the main body portion in which the body 4 and the flange portion 5 are integrally formed is formed in the vicinity of the periphery of the substantially disk-shaped panel portion 2. The rivet portion 7 is fixed. Moreover, although not shown in figure, the sealing agent made from an organic polymer is apply | coated and attached to the back surface side of the flange part 5 used as a winding fastening adhering part with a can body.

  The substantially disc-shaped panel portion 2 that is the central portion of such a can lid 1 is provided with a recess 8 having a large area so as to give rigidity to the panel portion 2 and make it easy to grip the tab 6. Ribbed recesses 9 and 10 for imparting rigidity to the portion 2 are formed, a pair of hemispherical protrusions 11 that are in contact with the lower surface of the tab 6 are formed, and the panel portion is raised when the tab 6 is raised. In order to make it easier to bend the portion close to the tab tip portion 6a of 2 downward, the vent score portion 12 consisting of a breakable main score line 12a and a non-breakable sub-score line 12b sandwiches the rivet portion 7 and the tab tip It is formed in the vicinity of the rivet portion 7 on the side opposite to the portion 6a.

  Moreover, the multilayer part 13 which folded the metal plate in multiple is formed over the outer edge of the substantially disk-shaped panel part 2, and the inner edge of the annular edge part 3 surrounding the outer side. That is, between the panel part 2 and the annular edge part 3, as shown in FIG. 3, the metal plate has an S-shaped cross section on the upper surface side at the outer end of the panel part 2, as shown in FIG. In addition, a metal plate is formed at the inner end of the annular edge portion 3 at the inner end of the annular edge portion 3 and formed at the lower layer side into a multilayer portion 13b having a S-shaped cross section. The end portions of the folded portions are in a continuous state, and the outer edge of the panel portion 2 and the inner edge of the annular edge portion 3 are annular multilayer portions 13a and 13b in which metal plates overlap each other in a S-shaped cross section. It has become.

  Further, as shown in FIG. 1 (A), the boundary portion between the outer edge of the panel portion 2 and the inner edge of the annular edge portion 3 (that is, a continuous portion of both the multilayer portions 13a and 13b) can be broken by engraving. The score part 14 (shown by a broken line for easy identification in the drawing but actually a continuous score line) is a non-score part (in the circumferential direction) along the outer edge of the panel part 2 ( It is formed in an arc shape over most of the circumferential direction so as to leave a portion where the score portion is not formed.

  In addition, a bending guide line 15 that is not broken is formed as an engraved line so as to connect both ends of the score portion 14, and in the vicinity of the bending guide line 15, Rib-shaped bead portions 16 and 17 are formed in order to increase the rigidity of both sides and ensure the bending at the bending guide wire 15. The bead portions 16 and 17 may be convex beads or concave beads, but the bead length is 10 to 20 mm, the bead height and R are 0.2 to 1.0 mm. It is preferable to form as follows.

  And in the area | region (part used as opening piece) enclosed by such a score part 14 and the bending guide line 15, in the position close | similar to the score part 14 on the opposite side of a non-score part (bending guide line 15). The tab 6 is fixed to the panel portion 2 by the rivet portion 7, and the tip portion 6 a of the tab 6 is close to a part of the score portion 14, and the tab tip portion 6 a is sandwiched by the rivet portion 7. A bent score portion 12 composed of a main score line 12a and a secondary score line 12b is formed so as to extend from the state along the rivet portion 7 to the both sides on the opposite side to the rivet side.

  By the way, about the score part 14 formed along the outer edge of the panel part 2 of the above can lids 1, in a present Example, it is a non-score part of the area | region of the opening piece enclosed by the score part 14 The groove depth (score remaining thickness) and the width (score at the opening of the groove) of the score portion 14 formed in a substantially V-shaped cross section in a substantially half region opposite to the (bending guide line 15). (Width) is formed to be constant, but after entering a substantially half region close to the non-score part (bending guide line 15), the score part 14 is as shown in FIG. As the end portion is approached (closer to the non-score portion), the remaining score thickness is gradually increased (that is, the depth of the score groove is gradually decreased) and the score width is gradually increased. Accordingly, the breaking strength of the score portion 14 (the resistance when the score portion 14 is broken) Force) is adapted to increase gradually.

  That is, in this embodiment, in the can lid 1 whose opening area (opening piece region) is 90% of the panel portion 2, the tab fixing portion (rivet portion 7) and the non-score portion (bending guide line 15) are provided. With the half position of the can lid as the two poles as a boundary, the score remaining thickness and the score width of the score portion 14 are constant in the half on the tab fixing portion (rivet portion 7) side, whereas the non-score portion (folding) In the half of the curve guiding line 15), as the end of the score portion 14 is approached, the remaining score thickness gradually increases (the depth of the score groove gradually decreases), and the score width gradually increases. ing. Specifically, with respect to the score remaining thickness, the taper step finally becomes 50 to 70 μm (preferably 55 to 65 μm) at the end of the score portion 14 as compared with the score remaining thickness up to the half position of the can lid. Thus, the score remaining thickness gradually increases, and the score width was 25 μm up to the half position of the can lid 1, but finally 30-50 μm ( It is gradually widened to preferably be 35 to 45 μm).

  The can lid 1 of the present embodiment having the structure as described above is configured such that the flange portion 5 is connected to the upper end opening edge of the can body with respect to the can body (can body) whose upper end is opened after the contents are filled. The use state of the can lid 1 which becomes the upper end wall of the can container by being fastened and fixed to the upper end wall of the can container is as described below.

  That is, when the unopened can lid 1 is opened, first, the main score of the vent score portion 12 is raised by lifting the tab 6 with a finger placed on the grip portion (rear end portion) 6b of the tab 6. Since the line 12a is broken and the panel portion 2 is easily bent in the vicinity of both ends of the vent score portion 12, the vicinity of the rivet portion 7 (on both sides of the vent score portion 12) is formed as shown in FIG. As a fulcrum, the rivet portion 7 is rotated approximately 90 ° so that the rivet portion 7 stands, and the tip portion 6a of the tab 6 fixed by the rivet portion 7 is pushed downward. As a result, the score portion 14 is formed at the tip portion 6a of the tab 6. The tab 6 is raised while initially breaking. When the tab 6 is raised as described above, the non-score portion of the score portion 14 formed along the outer edge of the panel portion 2 with the gripping portion 6b of the tab 6 as a force point and the tip portion 6a of the tab 6 as an action point. The part farthest from the (bending guide line 15) is initially broken by the tip 6 a of the tab 6.

  Next, by pulling up the tab 6 from such a state, the score portion 14 formed along the outer edge of the panel portion 2 is broken to a position where it is connected to the bending guide lines 15 at both ends thereof, and then bent. As shown in FIG. 4 (B), the panel portion 2 is bent at the portion of the guide wire 15 and the portion surrounded by the score portion 14 and the bending guide wire 15 is used as an opening piece. The area is opened. In such a state, by further pressing the tab 6 with a finger, the opening piece that occupies most of the panel portion 2 has a large opening as shown in FIG. 4C. It is folded back to the rear, and the opening of the can lid is completed.

  According to the can lid 1 of the present embodiment opened as described above, the score portion 14 is broken by breaking the score portion 14 by the operation of the tab 6 and folding the panel portion 2 at the bending guide line 15 portion. Even if the portion surrounded by the bending guide line 15 is used as an opening piece and a large portion of the panel portion 2 can be opened largely, and the contents in the can contain solids, Minutes can be easily removed without leaving them in the can.

  Moreover, at the time of opening the can lid 1, the score portion 14 along the outer edge of the panel portion 2 enters an approximately half region close to the non-score portion of the opening piece, and the score remaining thickness gradually increases. Since it is formed so that the width is gradually increased and the breaking strength (resistance force when breaking the score portion 14) is gradually increased, the outermost edge of the annular panel portion is covered. Even if the formed score portion 14 continues to be broken, the score portion 14 becomes difficult to break gradually as it approaches the end portion of the score portion 14, and the momentum at which the breaking of the score portion 14 proceeds is weakened. Therefore, the breakage of the score portion 14 can be reliably stopped at the end portion of the score portion 14, and it is possible to reliably prevent the non-score portion from tearing following the breakage of the score portion 14.

  In this embodiment, the bending guide line 15 is engraved so as to connect both ends of the score portion 14, and the bead portions 16 and 17 are rigid in the vicinity (parts on both sides) of the bending guide line 15. Therefore, when the portion of the opening piece of the panel portion 2 is folded back to the rear of the opening portion by the operation of the tab 6, it can be reliably folded at the portion of the bending guide line 15. The opening piece of the panel unit 2 can be easily folded back. Then, the bending of the panel portion 2 is reliably performed at a fixed position connecting both ends of the score portion 14, so that the breaking of the score portion 14 can be stopped more reliably at the end portion of the score portion 14.

  In addition, in the can lid 1 of the present embodiment, the opening piece portion is folded back to the rear of the opening portion even though the opening piece portion is largely opened in a state of being securely connected. When the consumer drinks the contents in the can directly from the opening, the opening piece does not get in the way of touching the consumer's nose or mouth. Even if the user touches the opening piece or the consumer's hand touches the opening piece, the multi-layer part 13a having an S-shaped cross section is formed on the edge part of the opening piece (the edge part of the panel part 2 where the score part 14 is broken). As a result, the outer bent portion of the S-shaped multi-layered portion 13a prevents the consumer from damaging the nose, mouth, hand, etc. due to the sharply broken end caused by the breaking of the score portion 14. be able to.

  Furthermore, in the state where the contents are left in the can, when the consumer simply tries to temporarily cover the opening of the can lid 1 with the opening piece, as shown in FIG. After the opening is completed, the tab 6 is picked with a finger and lifted in substantially parallel to first return to the state shown in FIG. 4 (B), and further maintain the posture of the tab 6 as it is. In this state, the tab 6 is pushed forward with a finger, and the tab 6 is moved substantially parallel to the diagonally forward and downward direction so that the portion of the opening piece folded back to the rear of the opening covers the opening from above. The opening portion is stretched forward so as to be substantially the same plane as the remaining portion of the panel portion 2, and the opening portion is almost completely covered by the opening piece portion.

  In such a case of temporarily covering with the opening piece, the multilayer portion 13a is formed at the edge portion of the panel portion 2 that becomes the opening piece (the edge portion of the panel portion 2 where the score portion 14 is broken). , The portion is reinforced by the multi-layer portion 13a and becomes highly rigid. As a result, the opening piece portion does not warp upward at the time of opening. Therefore, when the cover is temporarily covered so as to cover the opening portion with the opening piece after opening. In addition, by returning the folding at the bending guide line 15 to the original, the opening can be satisfactorily covered with the opening piece.

  As mentioned above, although one Example of the easy opening lid | cover of this invention was demonstrated, this invention is not limited only to the specific structure shown in said Example, For example, the opening area of a can lid | cover Regarding the size, in the embodiment, 90% of the entire panel portion is opened as an opening piece. However, the size can be appropriately changed in a range of 50% to less than 99% of the entire panel portion. The length of the score portion (and the length of the non-score portion) along the outer edge of the portion can also be appropriately changed according to the size of the opening area.

  In addition, the structure for gradually increasing the breaking strength of the score part is not limited to the structure in which both the score remaining thickness and the score width of the score part are gradually increased, and either the score remaining thickness or the score width is used. The structure may be such that only one is gradually increased, or the starting point or range (the starting point or range where the score remaining thickness or the score width is gradually increased) that gradually increases the breaking strength of the score part. Is not limited to the half on the non-score side from the half position of the can lid having the fixed portion of the tab and the non-score portion as both poles, but to an appropriate position (range) depending on the difference in the size of the opening area of the can lid It can be set.

  Furthermore, the bending guide line formed between the ends of the score part does not necessarily have to be formed as a score line, and also the bead part formed on both sides of the bending guide line, One side of the bending guide line may be used, or may be omitted at all in some cases. Furthermore, the S-shaped multi-layered portion formed at the edge of the opening portion can be implemented as a can lid without such a multi-layered portion, and the design can be changed as appropriate. Needless to say, it is a good thing.

About one Example of the easy opening lid | cover of this invention, (A) The top view which shows the can lid before winding and adhering to a can body, (B) From the initial stage fracture | rupture position of the score part along the panel part outer edge Explanatory drawing which shows typically the state of the score width and score remaining thickness until it reaches an edge part. Sectional drawing which shows the cross-sectional shape of the whole can lid which passes along the center of a can lid from the front-end | tip part of a tab about the can lid shown in FIG. The partial expanded sectional view which expands and shows a part of can lid shown in FIG. Sectional explanatory drawing which respectively shows the state (A), (B), (C) in each step when opening a can lid | cover about the can lid | cover shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Can lid 2 Panel part 3 Annular edge 6 Tab 13 Multilayer part 13a Multilayer part 13b (on the outer edge side of a panel part) Multilayer part 14 (Score part 15) Bending part 16 Bending part 17 Bead part

Claims (6)

  The score part along the outer edge of the panel part is formed over a half circumference of the outer edge of the annular panel part so as to leave a non-score part on the outer edge of the panel part, so that the area of the opening piece surrounded by the score part is An easy opening can lid that occupies 50% or more and less than 99% of the entire panel portion, and a tab for opening operation is fixed at a position close to the score portion on the side opposite to the non-score portion of the region of the opening piece In the predetermined range close to the non-score portion of the score portion along the outer edge of the panel portion, the score portion is formed so that the breaking strength gradually increases toward the end portion. Easy-to-open can lid.   The easy-open can lid according to claim 1, wherein the remaining thickness of the score portion is gradually increased as a structure for gradually increasing the breaking strength of the score portion.   The easy opening can lid according to claim 1 or 2, wherein the width of the score portion is gradually widened as a structure for gradually increasing the breaking strength of the score portion.   The easy opening according to any one of claims 1 to 3, wherein a bead portion is formed in the vicinity of a line connecting both ends of the score portion to ensure folding of the opening piece at the line. Can lid.   The easy opening can lid according to any one of claims 1 to 4, wherein at least a portion along the score portion of the opening piece is formed as a multi-layered portion in which the metal plates of the panel portion are folded in multiple layers.   Over the entire circumference of the panel part surrounded by the annular edge part, a multilayer part in which metal plates are folded in multiple is formed on each of the inner edge side of the annular edge part and the outer edge side of the panel part. The easy-to-open can lid according to claim 5.

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