lid

Abstract

The cap (1) is equipped with: a cap main body (11) having a top plate portion (21) and a cylindrical side edge portion (22) provided at a peripheral portion of the top plate portion (21); a sealing member (12) provided at an inner face side of the top plate portion (21) and sealing a mouth portion of a container (100); a slit portion (32) extending in a circumferential direction of the side edge portion (22); and a processed portion (33) formed in at least a portion of the circumferential direction of the slit portion (32) and formed at least on the top plate portion (21) side of the slit portion (32).

Description

Technical Field

[0001] This invention relates to a lid for sealing cans containing beverages. Background Technology

[0002] Previously, caps with a top plate and side edges that seal the opening of a container were known. Additionally, Japanese Patent Application Publication No. 2008-056323 discloses a cap in which a slit is formed in the side edge to release internal pressure when the cap is opened. Such a cap, when pressed onto the opening of the container (installing the cap onto the opening of the container), is extruded to form a corner connecting the top plate and the side edge.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2008-056323 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] With such a cap, when the circumferential length of the slit is long, there is a risk of deformation at the upper end of the slit when the corner of the cap body is extruded and formed when the cap is pressed against the container opening.

[0008] Therefore, the object of the present invention is to provide a cover that can suppress deformation even when a circumferentially long slit is formed.

[0009] The means to solve the problem.

[0010] According to one aspect of the present invention, the lid is equipped with: a lid body having a top plate portion and a cylindrical side edge portion disposed at the periphery of the top plate portion; a sealing member disposed on the inner surface side of the top plate portion for sealing the container opening; a slit portion extending circumferentially in the side edge portion; and a processing portion formed in at least a portion of the circumferential direction of the slit portion, and formed at least on the top plate portion side of the slit portion.

[0011] The effects of the invention

[0012] According to the present invention, a cover can be provided that can suppress deformation even when a circumferentially long slit is formed. Attached Figure Description

[0013] Figure 1 This is a side view showing the structure of a lid and can container according to one embodiment of the present invention.

[0014] Figure 2This is a side view showing the structure of the cover.

[0015] Figure 3 This is a top view showing the structure of the cover.

[0016] Figure 4 This is a cross-sectional view showing the structure of the cover. Detailed Implementation

[0017] Below, using Figures 1 to 4 The cover 1 is described according to one embodiment of the present invention.

[0018] Figure 1 This is a side view schematically illustrating the structure of the lid 1 and the can container 100 according to an embodiment of the present invention. Figure 2 This is a side view showing the structure of the lid 1 before it is capped at the opening (container opening) of the can container 100. Figure 3 This is a top view showing the structure of cover 1. Figure 4 yes Figure 3 The cross-sectional view of the structure of cover 1 is shown at section IV-IV.

[0019] like Figure 1 As shown, the lid 1 is secured by a rolled edge seam when it is placed over the opening of the container 100, thereby sealing the opening. First, using... Figure 1 Description of container 100.

[0020] like Figure 1 As shown, the can container 100 is a so-called bottle-type container for holding beverages, etc. For example, the can container 100 is made of a metal material such as aluminum alloy with a resin film deposited on both sides or a surface-treated steel plate. One end of the can container 100 is tapered, forming a cylindrical shape with a different outer diameter. The can container 100 has an opening at one end for discharging the contained beverage. The opening has a jaw, a male threaded portion, and a rolled edge on its outer circumferential surface from the bottom side of the can container 100 toward the end.

[0021] The jaw is formed by protruding in a ring shape. The rolled edge is formed with a diameter smaller than that of the male threaded part. In addition, the rolled edge is formed with a diameter smaller than that of the inner diameter of the cap 1. The rolled edge is formed by bending the end of the opening more than once. The rolled edge forms an opening for discharging the beverage contained in the can container 100.

[0022] like Figures 1 to 4 As shown, the cover 1 is equipped with a cover body 11 and a sealing member 12, wherein the sealing member 12 is integrally or independently disposed within the cover body 11. In this embodiment, an example of a cover 1 in which the sealing member 12 is integrally disposed within the cover body 11 will be described.

[0023] The cover body 11 is made of a material on which a resin coating layer is formed on a metal material such as aluminum alloy. The cover body 11 is formed into a cover shape by various forming processes such as extrusion forming, knurling forming, roll forming and pressure forming of a thin, flat, suitable material.

[0024] like Figures 1 to 4 As shown, the cover body 11 is equipped with a circular plate-shaped top plate portion 21 and a cylindrical side edge portion 22 hanging down from the periphery of the top plate portion 21. The top plate portion 21 and the side edge portion 22 of the cover body 11 are integrally connected by annular, curved or straight corner portions 23.

[0025] The top plate 21 is configured as a circular plate. For example... Figure 1 and Figure 4 As shown, the main surface of the top plate portion 21 is formed as a plane. In addition, at least one of the embossing and debossing processes can be performed on a portion of the top plate portion 21.

[0026] The side edge 22 is configured such that one end is connected to the top plate 21 via the corner portion 23, and the other end is open. For example... Figure 1 , Figure 2 and Figure 4 As shown, the side edge portion 22 has multiple knurled portions 31, multiple slit portions 32, machined portions 33 provided in each slit portion 32, female threaded portions 34, and anti-disassembly strip portions 35. In the side edge portion 22, for example, multiple knurled portions 31, multiple slit portions 32, and multiple machined portions 33 are formed on the end side on the top plate portion 21 side, and female threaded portions 34 are formed on the central side, and anti-disassembly strip portions 35 are formed on the end side of the opening.

[0027] By performing knurling, roll forming, and other processes on a cap-shaped molded article consisting of a top plate portion 21, corner portions 23, and a cylindrical side edge portion 22 without knurled portions 31, slit portions 32, internal thread portions 34, and tamper-evident strip portions 35, multiple knurled portions 31, multiple slit portions 32, internal thread portions 34, and tamper-evident strip portions 35 are formed on the side edge portion 22. Furthermore, the internal thread portions 34 are formed so that when the cap 1 is pressed onto the can container 100, it is installed in the can container 100.

[0028] The knurled portion 31 is a recessed portion of the side edge portion 22 that is concave inward in the radial direction. For example, a plurality of knurled portions 31 are arranged at equal intervals in the circumferential direction, and the slit portion 32 is arranged between a plurality of knurled portion groups arranged at equal intervals.

[0029] like Figures 1 to 4As shown, the slit portion 32 extends circumferentially over the side edge portion 22. For example, the circumferential length of the slit portion 32 is longer than the circumferential length of one knurled portion 31. The slit portion 32 protrudes from the inner circumferential surface of the side edge portion 22. The slit portion 32 is a cut for venting gas from the can container 100 when it is opened. For example, a suitable circumferential length of the slit portion 32 is 5 mm to 20 mm. Multiple slit portions 32 may be provided, but a single slit portion may also be provided.

[0030] Such knurled portions 31 and slit portions 32 are arranged, for example, in the circumferential direction. For instance, in this embodiment, knurled portions 31 are provided at 21 locations and slit portions 32 are formed at 3 locations in the circumferential direction of the side edge 22. Furthermore, the seven knurled portions 31 are arranged at equal intervals, and the slit portions 32 are arranged at 120° intervals between the three groups of knurled portions formed by the seven knurled portions 31. Additionally, the three slit portions 32 are provided at equal or approximately equal intervals in the circumferential direction of the side edge 22.

[0031] The processing portion 33 is formed in at least a portion of the circumferential direction of the slit portion 32, and is formed on at least the top plate portion 21 side of the slit portion 32. That is, the processing portion 33 is on the top plate portion 21 side of the slit portion 32, and is formed at at least one portion of the side edge portion 22 between the two ends of the slit portion 32. The processing portion 33 is, for example, provided in a recess or a protrusion of the side edge portion 22.

[0032] As a preferred example, the processing portion 33 is provided at both ends or both ends of the slit portion 32, more preferably at two locations at both ends. Alternatively, as a preferred example, the processing portion 33 is provided only on the top plate portion 21 side of the slit portion 32. Here, the two ends of the slit portion 32 refer to portions extending 1mm to 2mm from the ends of the slit portion 32. Furthermore, in the case where the slit portion 32 has a circumferential length of 5mm, and has a length such that when the processing portion 33 is moved a predetermined distance from the ends of the slit portion 32, the two processing portions 33 are located at the center of the slit portion 32, it is preferable to form the processing portion 33 at the ends of the slit portion 32.

[0033] exist Figures 1 to 3 In the example of this embodiment shown, the processing portion 33 is a recessed portion connected to both ends of the slit portion 32 and recessed radially inward from the outer periphery of the side edge portion 22, and is formed to extend upward from the outer end of the slit portion 32 toward the axial direction of the cover 1 (side edge portion 22). In addition, in this example of the embodiment, the processing portion 33 is formed such that its length in the axial direction of the cover body 11 is longer than its length in the circumferential direction.

[0034] The female thread portion 34 is configured to thread into the male thread portion of the can container 100. The female thread portion 34 is formed together with the can container 100. That is, the female thread portion 34 is not formed in the finished product of the cover 1 before it is installed on the can container 100; the female thread portion 34 is formed when it is assembled with the can container 100.

[0035] The tamper-evident strip 35 engages with the jaw of the can container 100 in the direction in which the lid 1 separates from the can container 100 and in the axial direction of the lid 1. Furthermore, the tamper-evident strip 35 has a break portion 35a for breaking and detaching from the side edge portion 22 when the lid 1 is opened. That is, the tamper-evident strip 35 is formed by leaving a break portion 35a at the end of the side edge portion 22 and creating a slit. Like the female thread portion 34, the tamper-evident strip 35, when integrated with the can container 100, is given the shape of the jaw of the can container 100, thereby engaging with the jaw.

[0036] The sealing member 12 is integrally formed with or independently of the cover body 11. In this embodiment, such as Figure 4 As shown, the sealing member 12 is integrally formed with the cover body 11.

[0037] A sealing member 12 is disposed on the inner surface of the top plate portion 21 to seal the container opening. The sealing member 12 is disposed on the top plate portion 21 at least opposite the opening of the container 100 when the cap 1 is pressed onto the container 100. The sealing member 12 is formed, for example, in an annular or circular plate shape. Alternatively, the sealing member 12 may also have a structure having a rib formed in a downwardly cylindrical shape that abuts against the inner circumferential surface of the opening, or an annular recess with an area for ensuring tight contact with the opening.

[0038] Alternatively, for example, the sealing member 12 may be constructed separately from the cover body 11 and formed as a circular plate with a sliding layer on the cover body 11 side and a sealing layer on the opening side.

[0039] Next, the manufacturing method of the cover 1 with this structure will be explained.

[0040] First, sheet metal material is extruded using a shell pressure device to form a cap-shaped molded product. Next, a molding processing device is used to form multiple knurled portions 31, multiple slit portions 32, multiple processed portions 33, and anti-tamper strip portions 35 on the molded product.

[0041] Next, using a sealing member forming apparatus, a sealing member 12 is formed within a molded article having multiple knurled portions 31, multiple slit portions 32, and tamper-evident strip portions 35. Through these processes, the cover 1 is manufactured. In this embodiment, the sealing member is formed by injection molding of resin material.

[0042] Additionally, for example, the manufactured lids 1 are collected by the collection department. If a certain number of lids 1 are collected, they are sent to the inspection and packaging process as the next step for quality inspection and packaging.

[0043] The following describes a method for sealing the manufactured cap 1 onto the opening of the can container 100. For example, the cap 1 is placed over the opening of the can container 100 such that the end portion (i.e., the rolled edge portion) of the opening of the can container 100 contacts the sealing member 12. In this state, a load is applied to the top plate portion 21 of the cap body 11, and while pressing the corner portion 23 downwards, i.e., toward the can container 100 side, the side edge portion 22 is rolled and formed. Thus, as Figure 1 As shown, the corner portion 23 is extruded into a predetermined shape, and a female thread portion 34 is formed on the side edge portion 22 of the cap 1. The cap 1 is fixed to the opening of the can container 100 by a rolled edge seam. This capping method is performed while the can container 100 is filled with a beverage. Furthermore, for example, the can container 100 with the cap 1 sealed is subjected to distillation treatment according to the contents.

[0044] The lid 1 thus constructed has a machined portion 33 in at least a portion of the circumferential direction of the slit portion 32 and on at least the top plate portion 21 side of the slit portion 32. Therefore, even if the wall diameter of the upper part of the slit portion 32 is reduced by extruding the corner portion 23 of the lid body 11 when the lid 1 is pressed onto the can container 100, deformation in the upper part of the slit portion 32 can be suppressed.

[0045] Furthermore, for the cover 1, by providing machining portions 33 at two locations at both ends or on both sides of the slit portion 32, it is possible to prevent the component, which has circumferentially shrunk compared to the slit portion 32 due to extrusion molding, from moving between the machining portions 33 formed at the two locations of the slit portion 32. Therefore, for the cover 1, deformation above the slit portion 32 can be prevented. In addition, for the cover 1, by making the machining portions 33 concave or convex, the machining portions 33 of the slit portion 32 can be strengthened to make them less prone to deformation, and the excess of the wall surface of the peripheral portion at both ends of the slit portion 32 can be reduced, and tension can be created between the machining portions 33 at the two locations.

[0046] Furthermore, by making the processing portion 33 concave or convex, and by making the length of the cover 1 in the axial direction longer than the length of the cover 1 in the circumferential direction, it is possible to suppress the flow of metal material outside the circumferential direction of the slit portion 32 to the upper part of the slit portion 32 during extrusion molding, thus suppressing the deformation of the upper part of the slit portion 32.

[0047] Furthermore, the present invention is not limited to the embodiments described above. For example, although the above example illustrates one instance of the number of knurled portions 31 and slit portions 32, the number of knurled portions 31 and slit portions 32 can be appropriately set.

[0048] Furthermore, in the above example, regarding the processing section 33, as a specific example of having the processing section 33 in at least a portion of the circumferential direction of the slit section 32 and on at least the top plate portion 21 side of the slit section 32, a structure with two portions formed at both ends of the slit section 32 and on the top plate portion 21 side is described; however, it is not limited to this. For example, it may be a structure with three portions provided at both ends and the center of the slit section 32, or a structure with one portion provided at the center, or even a structure with four or more portions. Additionally, the processing section 33 may also be a structure provided not only on the top plate portion 21 side of the slit section 32 but also on the opening side of the side edge portion 22. However, the processing section 33 is preferably a structure with two portions provided at both ends or both ends of the slit section 32.

[0049] Furthermore, the machining section 33, whose length in the axial direction is longer than its length in the circumferential direction, is, for example, straight, but it can also be rectangular or elliptical. Additionally, as long as the machining section 33 has a shape that can suppress deformation, its length in the circumferential direction and its length in the axial direction can be the same.

[0050] Furthermore, in the examples described above, the processed portion 33 was shown to be either concave or convex. However, for example, the processed portion 33 could also be a slit. However, when the processed portion 33 is a slit, there is a risk of generating metal powder, and the reinforcing effect around the processed portion 33 is reduced. Therefore, it is preferable for the processed portion 33 to be concave or convex.

[0051] Furthermore, the present invention is not limited to the above-described embodiments, and various modifications can be made during implementation without departing from its spirit. Additionally, the embodiments can be appropriately combined, in which case the combined effect is obtained. Moreover, various inventions are included in the above embodiments, and various inventions can be extracted from combinations selected from a plurality of disclosed structural elements. For example, if the problem can be solved and the effect obtained even if some structural elements are removed from all the structural elements shown in the embodiments, the structure in which those structural elements are removed can be extracted as an invention.

[0052] Explanation of reference numerals in the attached figures

[0053] 1···Lid, 11···Lid body, 12···Sealing component, 21···Top plate, 22···Side edge, 23···Corner, 31···Knurled part, 32···Slit part, 33···Machined part, 34···Female threaded part, 35···Anti-disassembly strip part, 35a···Break-off part, 100···Tank container (container).

Claims

1. A cap equipped with: a cap main body having a top plate portion and a cylindrical side edge portion provided to a peripheral edge portion of the top plate portion; a sealing member provided to an inner face side of the top plate portion to seal a container mouth portion; a slit portion extending in a circumferential direction of the side edge portion; and a processed portion formed in at least a portion of the circumferential direction of the slit portion and formed at least on the top plate portion side of the slit portion, the processed portion being a recess or a protrusion provided to the side edge portion, whereby the processed portion is reinforced to be difficult to deform.

2. The cap according to claim 1, wherein the processed portion is provided at two positions of both end portions or both end sides of the slit portion.

3. The cap according to claim 1 or 2, wherein the processed portion is provided only on the top plate portion side of the slit portion.

4. The cap according to claim 1 or 2, wherein a length of the processed portion in an axial direction of the cap is made longer than a length in the circumferential direction.

5. The cap according to claim 3, wherein a length of the processed portion in the axial direction of the cap is made longer than a length in the circumferential direction. ​ ​ ​ ​ ​ ​

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