JP2021024585A - Cap, tool and production device - Google Patents

Abstract

To provide a cap to which a seal member can be engaged and which can prevent damage of the seal member, a tool and a production device.SOLUTION: A cap 100 comprises: a cap body 111 comprising a top plate part 121, and a cylindrical skirt part 122 provided on a peripheral edge part of the top plate part 121; a seal member 112 provided in the cap body 111 so as to face the top plate part 121, separately from the cap body 111; and an engagement part comprising a plurality of recesses 135 provided in a circumferential direction of the skirt part 122 and recessed inward in a radial direction of the cap body 111, in which a primary side of a plug opening direction in the circumferential direction of the recesses 135 and at least one of the top plate part 121 side of the recesses 135 and a tip end side of the skirt part 122 on the recesses 135 are not continuous to the skirt part 122, and a secondary side of the plug opening direction in the circumferential direction of the recesses 135 is continuous to the skirt part 122, for supporting the seal member 112 by the plurality of recesses 135.SELECTED DRAWING: Figure 2

Description

The present invention relates to a cap having a vent slit, a tool for manufacturing the cap, and a manufacturing apparatus.

Conventionally, many caps for sealing the container mouth are provided with a resin sealing member in close contact with the container mouth on the inner surface of the cap body. Then, in such a cap, in order to reduce the opening torque at the time of opening the cap, a technique for making the cap body and the sealing member non-adhesive has been proposed. (See Patent Document 1 and Patent Document 2)

Japanese Unexamined Patent Publication No. 2004-217295 JP-A-2017-178421

In the above-mentioned cap, in order to prevent the sealing member from falling off from the cap body, it is conceivable to lock the sealing member in the recess having the vent slit. However, if the recess is formed to be deep in the radial direction of the cap body in order to sufficiently lock the sealing member, a crack may occur at the end of the vent slit.

Therefore, it is conceivable to form a vertical slit extending in the axial direction at the end of the vent slit extending in the circumferential direction so that the concave portion has a deep shape in the radial direction without causing a crack.

However, when this cap is used, since the cap body and the sealing member are not adhered to each other, the end of the vertical slit of the recess is formed when the cap body rotates when the cap is opened and the sealing member is stationary. The portion may come into contact with the outer peripheral edge of the sealing member, and the sealing member may be damaged.

Therefore, an object of the present invention is to provide a cap, a tool, and a manufacturing apparatus capable of locking the sealing member and preventing damage to the sealing member.

The cap according to one aspect of the present invention has a cap body having a top plate portion and a tubular skirt portion provided on the peripheral edge portion of the top plate portion, and a separate body from the cap body portion facing the top plate portion. It has a sealing member provided in the cap body and a plurality of recesses provided in the circumferential direction of the skirt portion and recessed inward in the radial direction of the cap body, in the circumferential direction of the recess. At least one of the primary side in the opening direction and the top plate side of the recess or the tip end side of the skirt portion of the recess is discontinuous with the skirt portion, and two of the opening directions in the circumferential direction of the recess. The next side is provided with a locking portion that supports the sealing member with the plurality of recesses that are continuous with the skirt portion.

The tool according to one aspect of the present invention has a disc-shaped first base portion arranged in a tubular skirt portion provided on the cap body and a first tool having a plurality of first protrusions formed on the outer peripheral surface in the radial direction. A second base portion that has an outer peripheral surface having a predetermined curvature and is provided so as to face each other and rotates relative to the first base portion, and a part of the skirt portion provided on the outer peripheral surface of the second base portion. The recess is formed by cutting at least one of the primary side in the opening direction of the cap body, the top plate side of the cap body, and the tip side of the skirt, and bending in the secondary side in the opening direction. By rotating the first base portion and the second base portion relatively, a plurality of second protrusions sequentially arranged between the adjacent first protrusions of the first tool are provided.

The manufacturing apparatus according to one aspect of the present invention includes a disk-shaped first base portion arranged in a tubular skirt portion provided on a cap body, and a plurality of first base portions formed on the outer peripheral surface of the first base portion. A first tool having a protrusion, a second base portion that is provided so as to face the first tool in the radial direction and has an outer peripheral surface having a predetermined curvature, and a second base portion that rotates relative to the first base portion, and the second base portion. A part of the skirt portion provided on the outer peripheral surface of the base portion is cut at least on the primary side in the opening direction of the cap body, the top plate portion side of the cap body, and the tip end side of the skirt portion. A plurality of second parts that are sequentially arranged between the adjacent first protrusions of the first tool by the relative rotation of the first base portion and the second base portion that are bent on the secondary side in the opening direction. A second tool having a protrusion and a drive device for rotating at least one of the first tool and the second tool are provided.

According to the present invention, it is possible to provide a cap, a tool, and a manufacturing apparatus capable of locking the sealing member and preventing damage to the sealing member.

A side view showing a structure of a cap and a can container provided with the cap according to the first embodiment of the present invention in a partial cross section. A side view showing the structure of the cap in a partial cross section. The cross-sectional view which shows the structure of the cap. The side view which shows the main part structure of the skirt part of the same cap. The cross-sectional view which shows the structure of the main part of the skirt part. The plan view which shows typically the structure of the manufacturing apparatus which manufactures the cap. The perspective view which shows the structure of the 2nd protrusion of the 2nd tool used in the manufacturing apparatus. The plan view which shows the structure of the 2nd protrusion. The side view which shows the structure of the 2nd protrusion. The explanatory view which shows an example of the evaluation test and the evaluation test result of the cap which concerns on Example and the cap which concerns on a comparative example manufactured by this manufacturing apparatus. The side view which shows the structure of the cap which concerns on 2nd Embodiment of this invention in a partial cross section. The cross-sectional view which shows the structure of the cap.

Hereinafter, the cap 100 and the manufacturing apparatus 1 for the cap 100 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 10.
FIG. 1 is a side view showing a configuration of a cap 100 and a can container 200 provided with the cap 100 according to the first embodiment of the present invention in a partial cross section. FIG. 2 is a side view showing the configuration of the cap 100 in a partial cross section. FIG. 3 is a cross-sectional view showing the configuration of the cap 100 in a cross section taken along line III-III in FIG. FIG. 4 is a side view showing the configuration of the recess 135 and the vent slit 136 of the skirt portion 122 of the cap 100, and FIG. 5 is a cross-sectional view showing the configuration of the recess 135 and the vent slit 136 of the skirt portion 122. FIG. 6 is a plan view schematically showing the configuration of the manufacturing apparatus 1 for manufacturing the cap 100. FIG. 7 is a perspective view showing the configuration of the second protrusion 32 of the second tool 12 used in the manufacturing apparatus 1. FIG. 8 is a plan view showing the configuration of the second protrusion 32, and FIG. 9 is a side view showing the configuration of the second protrusion 32. FIG. 10 is an explanatory diagram showing an example of an evaluation test and an evaluation test result of the cap 100 according to the example and the cap according to the comparative example manufactured by the manufacturing apparatus 1.

As shown in FIG. 1, the cap 100 is crowned on the can container 200. Here, as shown in FIG. 1, the can container 200 is a so-called bottle-type container for accommodating beverages and the like. For example, the can container 200 is made of a metal material such as an aluminum alloy or a surface-treated steel plate in which resin films are laminated on both sides. The can container 200 has a cylindrical shape having a different outer diameter with one end reduced in diameter. The can container 200 has a mouth portion 210 at one end for discharging the contained beverage. The mouth portion 210 has a jaw portion 211, a male screw portion 212, and a curl portion 213 on the outer peripheral surface thereof from the bottom surface side to the end portion of the can container 200.

The jaw portion 211 is configured to project in an annular shape. The curl portion 213 has a smaller diameter than the male screw portion 212. Further, the curl portion 213 is configured to be smaller than the inner diameter of the cap 100. The curl portion 213 is formed by bending the end portion of the mouth portion 210 one or more times. The curl portion 213 constitutes an opening for discharging the beverage stored in the can container 200.

As shown in FIGS. 1 to 3, the cap 100 includes a cap main body 111 and a sealing member 112 separately provided in the cap main body 111.

The cap body 111 is made of a material in which a resin film layer is formed on a metal material such as an aluminum alloy. The cap body 111 is formed into a cup shape by drawing the thin flat plate-shaped material.

The cap body 111 includes a disc-shaped top plate portion 121 and a cylindrical skirt portion 122 that hangs down from the peripheral edge portion of the top plate portion 121. In the cap body 111, the top plate portion 121 and the skirt portion 122 are integrally and continuously formed by an annular and curved corner portion 123.

The top plate portion 121 is formed in a disk shape. One end of the skirt portion 122 is continuous with the top plate portion 121 via the corner portion 123, and the other end is open. As shown in FIGS. 1 to 5, the skirt portion 122 includes a knurl portion 131, a female screw portion 132, and a tamper evidence band portion 133 from the end portion on the top plate portion 121 side to the opening end portion.

The knurled portion 131, the female screw portion 132, and the tamper evidence band portion 133 include a top plate portion 121, a cylindrical skirt portion 122 in which the knurled portion 131, the female screw portion 132, and the tamper evidence band portion 133 are not formed, and a corner. The cup-shaped molded product 111A composed of the portion 123 is molded by performing processing such as nerling molding or roll-on molding.

The knurled portion 131 has a plurality of recesses 135. The recess 135 projects from the inner peripheral surface of the skirt portion 122. The recess 135 is one of the end of the skirt portion 122 on the top plate portion 121 side and the opening end side of the skirt portion 122 in the axial direction of the skirt portion 122, and the primary side in the opening direction in the circumferential direction of the skirt portion 122. It has a vent slit 136 provided across the (upstream side) end. That is, the recess 135 is discontinuous with the skirt portion 122 on one side of the top plate portion 121 side and the opening tip side of the skirt portion 122 and the primary side in the opening direction, and the top plate portion 121 side and the tip end side of the skirt portion 122. On the other hand, the secondary side (downstream side) in the opening direction is continuous with the skirt portion 122. The plurality of recesses 135 in which the vent slit 136 is formed form a locking portion that locks the movement of the sealing member 112. In the present embodiment, the recess 135 has a vent slit 136 at the end of the top plate 121 side and the primary side of the skirt 122 in the opening direction.

As a specific example, as shown in FIGS. 3 to 5, the end portion 135a on the top plate portion 121 side in the axial direction of the recess 135 is discontinuous with the skirt portion 122 due to a part of the vent slit 136, and the skirt portion It is located inward in the radial direction of the skirt portion 122 with respect to the inner peripheral surface of the 122. The first end portion 135b on the primary side of the recess 135 in the opening direction is discontinuous with the skirt portion 122 due to a part of the vent slit 136. The second end 135c on the secondary side (downstream side) of the recess 135 in the opening direction is a bent portion in which a part of the skirt portion 122 is bent and is continuous with the skirt portion 122. The second end 135c is inclined or curved, for example, from the end 135a toward the opening end (tip) side of the skirt portion 122. The second end portion 135c is curved, for example, from the end portion 135a toward the tip end side of the skirt portion 122 so that the width of the recess 135 in the opening direction gradually decreases.

As shown in FIGS. 1 to 5, the vent slit 136 is a notch for discharging the gas in the can container 200 when the cap is opened. As shown in FIGS. 4 and 5, the vent slit 136 includes a lateral cutting portion 136a extending in the circumferential direction of the skirt portion 122 and a vertical cutting portion 136b extending in the axial direction of the skirt portion 122. The lateral cutting portion 136a is formed at the end of the skirt portion 122 of the recess 135 on the top plate portion 121 side. The vertical cutting portion 136b is formed on the first end portion 135b on the upstream side (primary side) of the skirt portion 122 of the recess 135 in the opening direction. For example, the vertical cutting portion 136b extends along the axial direction of the skirt portion 122.

In the vent slit 136, a plurality of recesses 135 can lock the sealing member 112, and the end portion of the vent slit 136 on the tip end side of the skirt portion 122 is more cap 100 than the end portion of the vent slit 136 on the top plate portion 121 side. It protrudes inward in the radial direction.

As shown in FIG. 1, the female screw portion 132 is configured to be screwable with the male screw portion 212 of the can container 200. The female screw portion 132 is formed together with the can container 200. That is, the female screw portion 132 is not molded in the finished product of the cap 100 before being attached to the can container 200, but is molded when integrally combined with the can container 200.

As shown in FIGS. 1 and 2, the tamper evidence band portion 133 engages with the jaw portion 211 of the can container 200 in the direction in which the cap 100 is separated from the can container 200 and in the axial direction of the cap 100. To do. Further, the tamper evidence band portion 133 has a broken portion 133a for breaking when the cap 100 is opened and detaching from the skirt portion 122. That is, the tamper evidence band portion 133 is configured by forming a slit leaving the broken portion 133a on the end side of the skirt portion 122, and is integrally combined with the can container 200 like the female screw portion 132. Occasionally, it engages with the jaw portion 211 by being shaped into the shape of the jaw portion 211 of the can container 200. The broken portion 133a is a weakened portion that breaks with a predetermined force.

As shown in FIG. 2, the sealing member 112 is configured separately from the cap body 111. As shown in FIGS. 2 and 3, the sealing member 112 has a diameter larger than the diameter of the inscribed circle of the end portions 135a of the plurality of recesses 135 having the vent slits 136 provided in the skirt portion 122 of the cap body 111. It is a disk shape with an outer diameter. As a result, the plurality of recesses 135 lock the non-adhesive sealing member 112 to the cap body 111 by the end 135a on the lateral cutting portion 136a side of the vent slit 136, and the sealing member 112 has a plurality of sealing members 112 in the cap body 111. It is held by the end of the recess 135. Therefore, although the sealing member 112 is not adhered to the cap body 111, it is provided integrally with the cap body 111.

As shown in FIGS. 1 and 2, the sealing member 112 includes a disk-shaped sliding layer 141 and a disk-shaped sealing layer 142 integrally laminated on the sliding layer 141. In the sealing member 112, the sliding layer 141 and the sealing layer 142 are made of different synthetic resins. In the sealing member 112, the sealing layer 142 is integrally laminated on the sliding layer 141. For example, as shown in FIG. 2, the sealing member 112 includes a flat plate portion 112a having a uniform thickness, a curved surface portion 112b in which the outer surface of the outer peripheral edge on the top plate portion 121 side is a curved surface, and the flat plate portion 112a. It has a thick portion 112c that is thicker than the flat plate portion 112a provided between the curved surface portions 112b. In other words, the sealing member 112 has a disk shape, and the ridge portion on the top plate portion 121 side is formed of a curved surface having a predetermined curvature. As shown in FIG. 2, the thick portion 112c exists in a region of contact with the mouth portion 210 on the outer peripheral side of the sealing member 112, and is a sealing layer rather than the flat plate portion 112a on the central side of the sealing member 112. The thickness of 142 is thick.

The sliding layer 141 is made of a resin material having a relatively higher hardness (harder) than the sealing layer 142. Further, the sliding layer 141 is made of a resin material having neither adhesiveness nor adhesiveness with the resin film layer of the cap body 111. That is, the sliding layer 141 is not adhered to the top plate portion 121, and slides on the top plate portion 121 in a state of being in contact with the top plate portion 121.

Examples of the resin material used for the sliding layer 141 include olefin resins such as polypropylene resin and polyethylene resin, polyester resins such as polyethylene terephthalate, styrene resins, and acrylic resins. In the present embodiment, the sliding layer 141 is made of, for example, polypropylene resin. Pigments, lubricants, softeners and the like can be appropriately added to the resin material used for the sliding layer 141. Further, in the example of the present embodiment, the hardness of the sliding layer 141 is D10 to D70 in terms of the durometer D hardness according to JIS-K7215.

As shown in FIGS. 1 and 2, the sliding layer 141 is provided separately from the cap body 111 so as to face the top plate portion 121 of the cap body 111. The sliding layer 141 is configured to be slidable with the top plate portion 121 of the cap body 111 depending on the resin material used. The sliding layer 141 is formed in a disk shape. The outer diameter of the sliding layer 141 is smaller than the inner diameter of the skirt portion 122, is substantially the same as the inscribed circle of the knurl portion 131, or is slightly smaller than the inscribed circle of the knurl portion 131, and is slightly smaller than the inscribed circle of the mouth portion 210. It is configured to have a larger diameter than the outer diameter.

The sealing layer 142 is made of a resin material having a hardness (softer) relatively lower than that of the sliding layer 141. Examples of the resin material used for the sealing layer 142 include olefin resin, polyester resin, styrene resin, acrylic resin and the like, and more preferably, a blend material of styrene elastomer and polypropylene resin, low density polyethylene and styrene resin. Examples thereof include a blend material of an elastomer and a polyester-based elastomer. The resin material used for the sealing layer 142 has adhesiveness with the resin material used for the sliding layer 141. In the present embodiment, the sealing layer 142 is composed of, for example, a blend material of a styrene-based elastomer and a polypropylene resin. Pigments, lubricants, softeners and the like can be appropriately added to the resin material used for the sealing layer 142.

The sealing layer 142 is integrally provided on the main surface of the sliding layer 141 on the side facing the mouth 210. The sealing layer 142 is formed in a disk shape. The outer diameter of the sealing layer 142 is smaller than the inner diameter of the skirt portion 122, substantially the same diameter as the inscribed circle of the knurl portion 131, or slightly larger than the inscribed circle of the knurl portion 131, and the curl portion 213 of the mouth portion 210. It is configured to have a larger diameter than the outer diameter of. That is, the outer diameter of the sealing layer 142 is the same as the outer diameter of the sliding layer 141, or is configured to be larger than the outer diameter of the sliding layer 141.

In the method of capping the cap 100 to the mouth 210 of the can container 200 configured in this manner, for example, the curl portion 213, which is the tip of the mouth 210 of the can container 200, and the sealing layer 142 of the sealing member 112 come into contact with each other. The cap 100 is put on the mouth 210 of the can container 200 so as to do so. In this state, a load is applied to the top plate portion 121 of the cap body 111, and the skirt portion 122 is roll-on molded while the corner portion 123 is drawn downward (can container 200). As a result, as shown in FIG. 1, a female screw portion 132 is formed on the skirt portion 122 of the cap 100, and the cap 100 is wound and fixed to the mouth portion 210 of the can container 200. In addition, such a capping method is performed in a state where the beverage is filled in the can container 200. Further, for example, the can container 200 in which the cap 100 is capped is subjected to, for example, retort processing.

Next, opening of the cap 100 configured in this way will be described.
First, when the cap 100 is opened, the user rotates the cap body 111 in the opening direction indicated by the arrow in FIGS. 1 to 4 while holding the cap body 111. Then, in the cap body 111, since the female screw portion 132 of the skirt portion 122 moves along the male screw portion 212 of the mouth portion 210, the cap body 111 moves in the axial direction as the rotation angle of the cap body 111 increases. Separate from the mouth 210.

When the sealing member 112 is not in close contact with the mouth portion 210, the sealing member 112 is locked by the end portions 135a of the plurality of recesses 135 of the cap body 111 on the top plate portion 121 side, and the shaft of the skirt portion 122. The sealing member 112 is held in the direction. Therefore, when the cap body 111 is separated from the mouth 210, the sealing member 112 is also separated from the mouth 210. Then, when the internal pressure in the can container 200 is higher than the atmospheric pressure, the gas in the can container 200 passes through the vent slit 136 of the recess 135 and is discharged to the outside.

Further, when the sealing member 112 is in close contact with the mouth portion 210, the sealing member 112 is locked by the end portions 135a on the top plate portion 121 side of the plurality of recesses 135 of the cap body 111, and the shaft of the skirt portion 122. The sealing member 112 is held in the direction. Therefore, a force is applied by the recess 135 of the cap body 111 in the direction in which the sealing member 112 is peeled from the mouth 210, and the sealing member 112 is peeled from the cap body 111, whereby the cap body 111 and the sealing member 112 are opened. Separate from the portion 210.

When the sealing member 112 is in close contact with the mouth portion 210, the recess 135 of the cap body 111 may come into contact with the outer peripheral edge of the sealing member 112 in the opening direction. However, since the first end 135b of the recess 135 is located on the primary side in the opening direction and the second end 135c is located on the secondary side in the opening direction, when the cap body 111 rotates during opening. The second end 135c is on the front end side in the opening direction, and the second end 135c is on the rear end side in the opening direction.

Therefore, when the cap body 111 is rotated in the opening direction while the sealing member 112 is in close contact with the mouth portion 210 and the recess 135 comes into contact with the outer peripheral edge of the sealing member 112 in the opening direction, the recess 135 becomes the skirt portion 122. The continuous second end 135c contacts the outer peripheral edge of the sealing member 112. That is, since the recess 135 comes into contact with the outer peripheral edge of the sealing member 112 on the inner surface of the curved or inclined second end portion 135c, the cap is suppressed from generating excessive stress on the outer peripheral edge of the sealing member 112. The main body 111 is separated from the mouth 210.

According to the cap 100 configured in this way, in the circumferential direction of the skirt portion 122, the first end portion 135b on one side of the recess 135 is discontinuous with the skirt portion 122, and the second end portion on the other side of the recess 135. 135c was made continuous with the skirt portion 122. As a result, even if the depth of the recess 135 from the outer peripheral surface of the skirt portion 122, in other words, the height of the recess 135 protruding from the inner peripheral surface of the skirt portion 122 is increased, a part of the recess 135 is broken. Can be suppressed. Therefore, the diameter of the inscribed circle of the end portion 135a of the plurality of recesses 135 can be made sufficiently smaller than the outer diameter of the sealing member 112, and the sealing member 112 can be more reliably locked by the plurality of recesses 135. Can be done. Therefore, the cap body 111 can be prevented from falling off from the cap body 111 due to the plurality of recesses 135.

Further, in the recess 135, the first end portion 135b discontinuous with the skirt portion 122 is arranged on the primary side in the opening direction of the cap body 111, and the second end portion 135c continuous with the skirt portion 122 is opened of the cap body 111. It was placed on the secondary side in the plug direction. Therefore, when the cap body 111 is rotated in the opening direction and the recess 135 comes into contact with the outer peripheral edge of the sealing member 112, the second end portion 135c of the recess 135 first comes into contact with the sealing member 112. Contact the outer periphery. Since the second end portion 135c is continuous with the skirt portion 122 and the inner surface is curved, the area of contact with the sealing member 112 on the surface and the region of gradual contact due to the inclined or curved surface is increased. Become. Therefore, when the second end portion 135c comes into contact with the outer peripheral edge of the sealing member 112, stress is reduced from being applied to the outer peripheral edge of the sealing member 112 as compared with the case where the first end portion 135b contacts first. it can. Further, since the end surface of the first end portion 135b is edge-shaped due to the vertical cutting portion 136b, even if the second end portion 135c comes into contact with the second end portion 135b, as compared with the case where such a first end portion 135b comes into contact with the end face. The outer peripheral edge of the sealing member 112 is not easily scratched. Therefore, even when the sealing member 112 comes into contact with the recess 135 when the cap 100 is opened, it is possible to prevent the outer peripheral edge of the sealing member 112 from being damaged by the second end portion 135c.

Further, since one end (second end) of the recess 135 is inclined or curved in the direction of the skirt portion 122, when the sealing member 112 is inserted into the cap body 111, it is inserted in the sealing member 112. I will guide you. Therefore, the plurality of recesses 135 can lock the sealing member 112, and even if the height of the recess 135 from the inner peripheral surface of the skirt portion 122 is set, the decrease in the insertability of the sealing member 112 into the cap body 111 is suppressed. it can.

Next, a manufacturing apparatus 1 for molding the knurled portion 131 having such a plurality of recesses 135 into the skirt portion 122 of the cap main body 111 (molded product 111A) will be described with reference to FIGS. 6 to 9.

As shown in FIG. 6, the manufacturing apparatus 1 includes a first tool 11, a second tool 12, and a driving device 13. The manufacturing apparatus 1 is an apparatus for forming a plurality of recesses 135 having vent slits 136 in the skirt portion 122 by performing a knurling process on the skirt portion 122 of the cap main body 111. The manufacturing apparatus 1 is recessed in a portion of the skirt portion 122 located between the first tool 11 and the second tool 12 by relatively rotating the first tool 11 and the second tool 12 by, for example, the driving device 13. Mold 135.

The first tool 11 includes a first base portion 21, a plurality of first protrusions 22, and a rotating shaft 23 provided on the first base portion 21. In the first tool 11, the first base portion 21 and the plurality of first protrusions 22 are arranged in the cap body 111.

The first base portion 21 is arranged in the skirt portion 122 of the cap body 111. The first base portion 21 has a disc shape having an outer diameter smaller than the inner diameter of the skirt portion 122. The first base 21 has, for example, a hole 21a into which the rotating shaft 23 is inserted. The hole 21a has, for example, a keyway.

The first protrusion 22 is, for example, a semi-cylindrical shape whose axial direction is along the axial direction of the first base portion 21. The plurality of first protrusions 22 have a predetermined distance in the circumferential direction from the adjacent first protrusions 22. Here, the predetermined interval is set to a width larger than the width in the circumferential direction of the second protrusion 32, which will be described later, of the second tool 12. The rotating shaft 23 is fixed to the first base portion 21.

The second tool is a tool for forming a recess 135 and a vent slit 136 in the skirt portion 122. As shown in FIGS. 6 to 9, the second tool 12 includes a second base portion 31 and a plurality of second protrusions 32. The second base 31 has, for example, a disk shape. The second base portion 31 is set to, for example, an outer diameter larger than the outer diameter of the first base portion 21 and the outer diameter of the skirt portion 122. The second base portion 31 is not a disk shape but a quarter circle shape or a semicircle shape as long as it has a structure having an outer peripheral surface having a curvature capable of suitably forming the recess 135 and the vent slit 136 together with the first tool 11. It may be arcuate or arcuate. Further, the second base portion 31 may be rotatable, and may not be rotatable when the first base portion 21 is rotated.

The second protrusion 32 forms a recess 135 having a vent slit 136 into the skirt portion 122. As shown in FIGS. 7 and 9, for example, the second protrusion 32 has a planar shape in which one end surface 32a is orthogonal to the axial direction in the axial direction, and the thickness in the axial direction is the smallest at the tip. The end surface 32b has an inclined surface shape that is inclined with respect to the axial direction. Further, as shown in FIGS. 7 and 8, the second protrusion 32 is formed on one side in the circumferential direction of the second base portion 31, and the first processed portion 32c for forming the first end portion 135b of the recess 135, and the first processed portion 32c. It has a second processed portion 32d formed on the other side in the circumferential direction of the second base portion 31 and forming the second end portion 135c of the recess 135.

The one end surface 32a of the second protrusion 32 forms a lateral cutting portion 136a of the vent slit 136 on the skirt portion 122. The other end surface 32b of the second protrusion 32 is formed with a recess 135 excluding the vent slit 136 by bending the skirt portion 122. The first processed portion 32c side of the other end surface 32b is, for example, flat, and the second processed portion 32d side of the other end surface 32b is, for example, curved. The one end surface 32a and the other end surface 32b of the second protrusion 32 are any of the ends of the second protrusion 32 in the axial direction of the second base portion 31, depending on the position of the lateral cutting portion 136a of the vent slit 136 with respect to the recess 135. It is placed in the crab.

The end face of the first processed portion 32c in the circumferential direction is flat. For example, the tip end side of the first processed portion 32c is inclined toward the center of the second protrusion 32 in the circumferential direction. The first processed portion 32c forms a vertical cutting portion 136b of the vent slit 136, which is the first end portion 135b of the recess 135, on the skirt portion 122 on the side surface 32c1 in the circumferential direction. The first processed portion 32c forms the first end portion 135b on the primary side in the skirt portion 122 in the opening direction of the recess 135.

The width of the second processed portion 32d gradually decreases from the side of the second base portion 31 toward the tip in the circumferential direction, and the end face in the circumferential direction is inclined or curved with respect to the axial direction. In the present embodiment, the second processed portion 32d will be described with reference to an example in which the end face in the circumferential direction is curved. The tip of the second processed portion 32d is a quarter circle in the plan view shown in FIG. In the second processed portion 32d, the side surface 32d1 in the circumferential direction bends the skirt portion 122 to form the second end portion 135c which is a part of the bent portion of the recess 135. The second processed portion 32d forms the second end portion 135c on the secondary side in the skirt portion 122 in the opening direction of the recess 135.

The drive device 13 is a drive source for relatively rotating the first tool 11 and the second tool 12. The drive device 13 rotates the rotating shaft 23, for example. The drive device 13 is, for example, a motor or a transmission mechanism that transmits the rotation of the motor to the rotation shaft 23. The drive device 13 rotates the first tool 11 in one direction. For example, as shown by the arrow in FIG. 6, the drive device 13 rotates the first tool 11 in the same direction as the opening direction of the cap 100.

The drive device 13 only needs to be able to rotate the first tool 11 and the second tool 12 relatively, and does not rotate the first base 21 via the rotation shaft 23 of the first tool 11, but the second tool 12 The second base portion 31 of the above may be rotated, or both the first base portion 21 and the second base portion 31 may be rotated. Further, in the drive device 13, for example, an initial position where the cap body 111 is arranged on the first tool 11 and a molding position where the first tool 11 and the second tool 12 are in a predetermined positional relationship and the cap body 111 is formed. It may be configured to be movable between.

In the manufacturing apparatus 1 configured as described above, the first tool 11 and the second tool 1 have the cap main body 111 arranged on the first tool 11 and the first tool 11 and the second tool 12 are in a predetermined positional relationship. The tool 12 is relatively rotated. At this time, since the diameter of the circumscribed circles of the first base portion 21 of the first tool 11 and the plurality of first protrusions 22 is smaller than the inner diameter of the skirt portion 122, the center of the cap body 111 is the rotation of the rotation shaft 23. It is eccentric with respect to the center, and a part of the skirt portion 122 is pressed toward the second tool 12.

When the first tool 11 and the second tool 12 are in the predetermined rotation positions, as shown in FIG. 6, one second protrusion of the second tool 12 is provided between the two adjacent first protrusions 22 of the first tool 11. 32 is located. Further, at this time, a part of the skirt portion 122 is sandwiched by two adjacent first protrusions 22 and one second protrusion 32 of the second tool 12.

Therefore, the two adjacent first protrusions 22 and a part of the inner peripheral surface of the skirt portion 122 are in close contact with each other, and a part of the outer peripheral surface of the skirt portion 122 is pressed by the second protrusion 32. As a result, the vent slit 136 is formed in the skirt portion 122 by the second protrusion 32, and the recess 135 excluding the vent slit 136 is bent. Then, by rotating the skirt portion 122 once in order to form the knurl portion 131 on the skirt portion 122, a plurality of recesses 135 having the vent slit 136 in the skirt portion 122 are formed.

According to such a manufacturing apparatus 1, the second protrusion 32 of the second tool 12 can process the vent slit 136 having the lateral cutting portion 136a and the vertical cutting portion 136b, and can bend the recess 135. As a result, the manufacturing apparatus 1 can easily form the recess 135 in the skirt portion 122, and can reduce the stress and stress applied to the recess 135 when the recess 135 is formed. Therefore, the manufacturing apparatus 1 can prevent the second tool 12 from causing unintended breakage of cracks or the like and burrs due to breakage at the end of the recess 135. Therefore, the manufacturing apparatus 1 can increase the bending amount of the recess 135, and can form the recess 135 having a size and shape that can lock the sealing member 112 on the skirt portion 122. That is, the cap 100 manufactured by the manufacturing apparatus 1 has the same effect as the cap 100 described above.

Further, the manufacturing apparatus 1 sets the opening direction of the cap 100 and the relative rotation directions of the first tool 11 and the second tool 12 in the same direction. As a result, the second processed portion 32d of the second protrusion 32 first abuts on the skirt portion 122 to process the lateral cutting portion 136a of the vent slit 136, and the concave portion 135 is bent from the second end portion 135c side. .. Then, as the rotation of the cap body 111 progresses, the lateral cutting portion 136a is gradually processed and the recess 135 is bent, and the vertical cutting portion 136b is processed at the final stage of molding the recess 135.

Therefore, the manufacturing apparatus 1 can cut the skirt portion 122 along the axial direction only on the side where the second protrusion 32 of the skirt portion 122 comes out. That is, in the initial stage of molding the recess 135, the manufacturing apparatus 1 first starts from the side of the second end 135c, which has a small amount of deformation due to the second processed portion 32d having the curved side surface 32d1, to the skirt portion 122 of the recess 135. Bend the tip side and bend the second end 135c. Then, when the molding of the recess 135 progresses in the skirt portion 122, the manufacturing apparatus 1 forms the vertical cutting portion 136b of the vent slit 136 by the first processed portion 32c.

Therefore, when the recess 135 is formed, the manufacturing apparatus 1 forms the vertical cutting portion 136b when the skirt portion 122 is deformed most and the stress is generated most in the recess 135, thereby forming the recess 135. It is possible to reduce the stress and stress that are sometimes applied to the skirt portion 122. As described above, the manufacturing apparatus 1 preferably intends the end portion of the recess 135 by setting the opening direction of the cap 100 and the relative rotation direction of the first tool 11 and the second tool 12 in the same direction. It is possible to prevent breakage and burrs due to breakage.

Further, since it is possible to prevent burrs from forming in the recess 135, it is possible to prevent defects caused by burrs, for example, burrs from peeling off and entering the can container 200, and the sealing member 112 is inserted into the cap body 111. This can prevent the sealing member 112 from being damaged.

As described above, according to the manufacturing apparatus 1 having the cap 100 and the second tool 12 according to the embodiment of the present invention, the sealing member 112 can be locked and the sealing member 112 can be prevented from being damaged.

Next, an evaluation test and an evaluation result for evaluating the features of the cap 100 and the manufacturing apparatus 1 configured in this way will be described with reference to FIG.

This evaluation test was carried out using Examples of the recess 135 formed by using the manufacturing apparatus 1 and Comparative Examples 1 to 3 as the cap 100 of the present embodiment. In addition, in FIG. 10, the target implementation with respect to the perspective model of the second protrusion in the Example and each Comparative Example, the shape in the plan view and the side view, and the diameter of the inscribed circle of the plurality of recesses of the conventional cap as a reference. The difference in the diameters of the inscribed circles of the plurality of recesses of the example and each comparative example, the plan view of the manufacturing apparatus, and the state of the recesses after molding are shown. Further, in Examples and Comparative Examples 1 to 3, the same manufacturing apparatus and cap main body 111 were used except that the shape of the second protrusion was different.

As an evaluation test, a concave portion was formed in the skirt portion 122 of the cap body 111, the formed concave portion was confirmed, and it was determined whether or not an unintended crack other than the vent slit was generated in the concave portion. In addition, the examples and each comparative example have the following configurations.

(Example)
The shape of the second protrusion 32 of the embodiment is the same as that of the second protrusion 32 of the second tool 12 according to the above-described embodiment. Further, the diameter of the inscribed circles of the plurality of recesses 135 formed by the second protrusion 32 of Example 1 was set to be 0.4 mm smaller than the diameter of the inscribed circles of the plurality of recesses of the conventional cap. That is, the height of one recess 135 from the inner peripheral surface of the skirt portion 122 was set 0.2 mm higher than the recess of the conventional cap.

(Comparative Example 1)
The shape of the second protrusion of Comparative Example 1 is such that one end surface of the second protrusion is a flat shape in which the lateral cutting portion 136a of the vent slit 136 is formed on the skirt portion 122, and the other end surface of the second protrusion has a predetermined curvature. It curves at a radius and inclines toward the tip of the second protrusion. The second protrusion of Comparative Example 1 does not form the vertically cut portion 136b of the vent slit 136. Further, the second protrusion is inclined at a predetermined angle from the outer peripheral surface of the second base portion 31, so that the width in the circumferential direction is gradually narrowed toward the tip, and the tip is semicircular with a predetermined radius of curvature.

Further, the diameter of the inscribed circles of the plurality of recesses 135 formed by the second protrusion of Comparative Example 1 was set to be 0.1 mm smaller than the diameter of the inscribed circles of the plurality of recesses of the conventional cap. That is, the height of the skirt portion 122 of one recess from the inner peripheral surface was set to be 0.05 mm higher than the recess of the conventional cap.

(Comparative Example 2)
The shape of the second protrusion of Comparative Example 2 is such that one end surface of the second protrusion is a flat surface for forming the lateral cutting portion 136a of the vent slit 136 on the skirt portion 122, and the other end surface of the second protrusion is a flat shape. Yes, it inclines toward the tip of the second protrusion. The second protrusion of Comparative Example 2 forms a vertical cutting portion 136b of the vent slit 136 at both ends in the circumferential direction. Further, the second protrusion is inclined at a predetermined angle from the outer peripheral surface of the second base portion 31, so that the width in the circumferential direction is gradually narrowed toward the tip, and the tip is in the tangential direction of the outer peripheral surface of the second base portion 31. Extend along.

Further, the diameter of the inscribed circles of the plurality of recesses 135 formed by the second protrusion of Comparative Example 2 was reduced by 0.3 mm with respect to the diameter of the inscribed circles of the plurality of recesses of the conventional cap. That is, the height of the skirt portion 122 of one recess from the inner peripheral surface was set 0.15 mm higher than the recess of the conventional cap.

(Comparative Example 3)
The shape of the second protrusion of Comparative Example 3 is such that one end surface of the second protrusion is a flat surface for forming the lateral cutting portion 136a of the vent slit 136 on the skirt portion 122, and the other end surface of the second protrusion is a flat shape. Yes, it inclines toward the tip of the second protrusion. The second protrusion of Comparative Example 3 forms a vertical cutting portion 136b of the vent slit 136 at both ends in the circumferential direction. Further, the width of the second protrusion in the circumferential direction is made constant from the outer peripheral surface of the second base portion 31 toward the tip end.

Further, the difference between the diameter of the inscribed circles of the plurality of recesses of the conventional cap and the diameter of the inscribed circles of the plurality of recesses 135 formed by the second protrusion of Comparative Example 3 was set to 0.2 mm. That is, the height of the skirt portion 122 of one recess from the inner peripheral surface was set 0.10 mm lower than the recess of the conventional cap.

(Evaluation test result)
As shown in FIG. 10, cracks other than the vent slit were formed in the recesses of Comparative Examples 1 to 3. On the other hand, no cracks other than the vent slit 136 were generated in the recess 135 of the example. In the examples, the height of the recessed skirt portion 122 from the inner peripheral surface is set higher than that of each comparative example. From this result, the height of the recessed skirt portion 122 from the inner peripheral surface is not related to the crack. I understand. Further, Comparative Example 2 and Comparative Example 3 have a configuration in which vertical cutting portions are provided at two locations as vent slits, but since cracks have occurred, it is possible to prevent cracks from occurring in the recesses simply by providing the vertical cutting portions. I also understand that I can't do it.

As is clear from these facts, according to the cap 100 and the manufacturing apparatus 1 of the present embodiment, the inner diameter of the inscribed circle of the plurality of recesses 135 is set to be smaller than the conventional diameter so that the sealing member 112 can be locked. However, it is possible to prevent damage such as cracks and burrs from occurring in the recesses.

The present invention is not limited to the above-described embodiment. For example, as shown in FIGS. 11 and 12, the cap 100 does not have the vent slit 136 in addition to the plurality of recesses 135 having the vent slit 136 in the knurled portion 131, for example, 3 or 4. It may be configured to have a second recess 137. Such a plurality of second recesses 137 lock the sealing member 112 together with or separately from the plurality of recesses 135. Further, as shown in FIG. 11, such a second recess 137 may be arranged on the top plate portion 121 side of the plurality of recesses 135 in the axial direction of the skirt portion 122, for example.

Further, the number of recesses 135 and the opening area of the vent slit 136 can be appropriately set depending on the shape of the cap 100 and the can container 200, the contents to be accommodated in the can container 200, the internal pressure inside the can container 200, and the like. Further, the sealing member 112 used for the cap 100 is non-adhesive to the cap body 111, and can be appropriately set as long as the mouth 210 of the can container 200 can be sealed.

Further, in the above-described example, the recess 135 has a configuration in which the vent slit 136 is provided at the end of the top plate portion 121 side and the end portion of the skirt portion 122 on the primary side in the opening direction, but the present invention is not limited thereto. For example, the recess 135 may have a vent slit 136 at the tip end side of the skirt portion 122 in the axial direction of the skirt portion 122 and at the end portion of the primary side in the opening direction in the circumferential direction of the skirt portion 122. As a result, the vertical cutting portion 136b is formed so as to extend from the horizontal cutting portion 136a toward the top plate portion 121 side, and the recess 135 is formed on the top plate portion 121 side of the horizontal cutting portion 136a. The sealing member 112 is locked by the wall surface of the recess 135 that is recessed in. Further, it goes without saying that the shape of the second tool 12 can be appropriately changed so that such a recess 135 can be formed. Further, the lateral cutting portion 136a may be formed on both the top plate portion 121 side of the recess 135 and the tip end side of the skirt portion 122. In the case of such a lateral cutting portion 136a, in order to form the lateral cutting portion 136a on both the top plate portion 121 side of the recess 135 and the tip end side of the skirt portion 122, for example, the second tool 12 second. The protrusion 32 may have a shape in which both end faces 32a and 32b are flat in the axial direction and the secondary side in the opening direction is bent.

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

1 ... Manufacturing equipment, 11 ... 1st tool, 12 ... 2nd tool, 13 ... Drive device, 21 ... 1st base, 21a ... Hole, 22 ... 1st protrusion, 23 ... Rotating shaft, 31 ... 2nd base, 32 ... second protrusion, 32a ... one end surface, 32b ... other end surface, 32c ... first processed portion, 32c1 ... side surface, 32d ... second processed portion, 32d1 ... side surface, 100 ... cap, 111 ... cap body, 111A ... molded product , 112 ... Sealing member, 112a ... Flat plate part, 112b ... Curved surface part, 112c ... Thick part, 121 ... Top plate part, 122 ... Skirt part, 123 ... Corner part, 131 ... Nar part, 132 ... Female screw part 133 ... Tamper evidence band part, 133a ... Breaking part, 135 ... Recessed part, 135a ... End part, 135b ... First end part, 135c ... Second end part, 136 ... Vent slit, 136a ... Horizontal cutting part, 136b ... Vertical cutting part , 137 ... Second recess, 141 ... Sliding layer, 142 ... Sealing layer, 200 ... Can container, 210 ... Mouth, 211 ... Jaw, 212 ... Male screw, 213 ... Curl.

Claims (9)

A cap body having a top plate portion and a tubular skirt portion provided on the peripheral portion of the top plate portion, and a cap body.
A sealing member provided in the cap body separately from the cap body and facing the top plate portion.
The skirt portion is provided in the circumferential direction and has a plurality of recesses recessed inward in the radial direction of the cap body, and the primary side in the opening direction in the circumferential direction of the recess and the top plate portion of the recess. In the plurality of recesses, at least one of the side or the tip end side of the skirt portion of the recess is discontinuous with the skirt portion, and the secondary side in the opening direction in the circumferential direction of the recess is continuous with the skirt portion. A locking portion that supports the sealing member and
Cap with. The locking portion extends in the axial direction of the skirt portion to the lateral cutting portion extending in the circumferential direction to the end portion of the recess on the top plate portion side and to the primary side end portion of the recess in the opening direction. The cap according to claim 1, which has a vertically cut portion. The cap according to claim 2, wherein the end portion of the concave portion on the secondary side in the opening direction is inclined or curved from the lateral cutting portion of the concave portion toward the tip end side of the skirt portion. .. The cap according to any one of claims 1 to 3, wherein the diameter of the inscribed circle at the end of the plurality of recesses on the top plate side is smaller than the outer diameter of the sealing member. A disc-shaped first base portion arranged in a tubular skirt portion provided on the cap body and a first tool having a plurality of first protrusions formed on the outer peripheral surface, and having a predetermined curvature provided so as to face each other in the radial direction. A second base having an outer peripheral surface and rotating relative to the first base,
A part of the skirt portion provided on the outer peripheral surface of the second base portion is cut at least on the primary side in the opening direction of the cap body, the top plate portion side of the cap body, and the tip end side of the skirt portion. At the same time, the first base portion and the second base portion, which are bent on the secondary side in the opening direction to form a concave portion, rotate relative to each other, so that the first protrusions of the first tool are sequentially adjacent to each other. With multiple second protrusions arranged in
Tools equipped with. The second protrusion cuts the top plate side of the cap body of the recess along the rotation direction of the first base or the second base, and the primary side of the recess in the opening direction is the first. Cut along the center of rotation of the base or the second base.
The tool according to claim 5. The tool according to claim 6, wherein the second protrusion is bent in an inclined or curved shape from the secondary side of the recess in the opening direction toward the tip of the skirt. The tool according to any one of claims 5 to 7, wherein the rotation direction of the first base portion or the second base portion is the same as the opening direction. A disc-shaped first base portion arranged in a tubular skirt portion provided on the cap body, and a first tool having a plurality of first protrusions formed on the outer peripheral surface of the first base portion.
A second base portion that is provided so as to face the first tool in the radial direction and has an outer peripheral surface having a predetermined curvature and that rotates relative to the first base portion, and an outer peripheral surface of the second base portion. A part of the skirt portion is cut on at least one of the primary side in the opening direction of the cap body, the top plate portion side of the cap body, and the tip end side of the skirt portion, and the secondary side in the opening direction. A second tool having a plurality of second protrusions sequentially arranged between the adjacent first protrusions of the first tool by rotating the first base portion and the second base portion relative to each other. ,
A drive device that rotates at least one of the first tool and the second tool, and
A manufacturing device.