JP6964457B2 - Cap and bottle with cap - Google Patents

Description

The present invention relates to a cap attached to the mouth of a bottle such as a bottle can, and a capped bottle to which the cap is attached.

As such a cap and a bottle with a cap, Patent Document 1 includes a top plate portion arranged above and a cylindrical portion substantially hung from the peripheral edge of the top plate portion, and is provided on the inner surface of the top plate portion. A metal cap that seals the mouth of the bottle after the liner is inserted in a non-adhesive state. It has a vent hole and an upper protrusion and a lower protrusion formed by bending the upper opening end and the lower opening end of the vent hole inward in the radial direction of the cylindrical portion, and the tip of the upper protrusion has a vent hole. , A metal cap that is located radially inward from the outer peripheral edge of the liner when inserted, and is located at the same position in the radial direction as the tip of the lower protrusion or radially outward from the tip. , And a capped bottle with such a metal cap attached to the mouth of the bottle body.

Japanese Unexamined Patent Publication No. 2011-240937

However, in the cap described in Patent Document 1, the tip of the lower protrusion separated from the inner surface of the top plate into which the liner is inserted in a non-adhesive state is at the same position in the radial direction as the tip of the upper protrusion, or the upper part. Since it is located radially inward from the tip of the protrusion, even if the tip of the upper protrusion is located radially inward from the outer peripheral edge of the liner, the upper protrusion securely locks the liner. This can be difficult and the liner may come off the cap. On the other hand, on the contrary, if, for example, the tips of all the upper protrusions are located radially outward from the tips of the lower protrusions, the liner will be removed when the non-adhesive liner is inserted. The peripheral edge may be caught by the tip of the upper protrusion and not hooked, resulting in incomplete insertion.

Further, when the cap is opened, the internal pressure of the gas in the bottle is released from the vent hole as described above, but at this time, the tip of the upper protrusion of the vent hole is lower as in the cap described in Patent Document 1. If it is located radially outside the tip of the protrusion, the contents of the bottle such as beverages discharged together with the gas in the bottle whose internal pressure is released pass through the vent hole from the inner surface of the lower protrusion. It may leak out as droplets and stain the hands of the person who opened the bottle.

Further, when the bottle is a bottle can with a screw having a male screw portion formed in the mouth portion and the cap has a female screw portion screwed to the male screw portion, the contents to the bottle Even if you try to wash the beverage etc. that adhered to the male screw part at the time of filling with the washing water injected from the vent hole after attaching the cap, the tip of the upper protrusion is located radially outside the tip of the lower protrusion. Therefore, it is also difficult to inject the washing water from the inner surface of the lower protrusion into the male thread through the vent hole.

The present invention is made under such a background, the liner can be securely locked to prevent the liner from coming off from the cap, and the liner can be inserted even when the liner is inserted in a non-adhesive state. It will not be incomplete, and even if the internal pressure inside the bottle is released when the cap is opened, it will not stain your hands due to the leakage of droplets of the contents, and the contents will be in a bottle can with screws. It is an object of the present invention to provide a cap and a bottle with a cap that can be reliably washed with the washing water injected from the vent hole even if an object adheres to the male screw portion.

In order to solve the above problems and achieve such an object, the cap of the present invention has a disk-shaped top plate portion centered on the cap center line and the cap center line from the outer periphery of the top plate portion. A cap having a cap body integrally formed with a peripheral wall portion extending in a cylindrical shape around the center, and a disk-shaped liner disposed on the inner surface of the top plate portion of the cap body. In the portion of the peripheral wall portion of the cap body near the top plate portion, a vent hole extending in a circumferential direction to release the internal pressure of the gas in the bottle body when the cap is opened, and the vent hole of the vent hole. A plurality of hook portions having an upper hook and a lower hook in which the upper opening and the lower opening are bent in the radial inner peripheral side with respect to the cap center line are formed at intervals in the circumferential direction. Is an upper hook projecting portion in which the inner peripheral end of the upper hook is located on the inner peripheral side in the radial direction from the outer peripheral edge of the liner and is located on the inner peripheral side in the radial direction from the inner peripheral end of the lower hook. The inner peripheral end of the lower hook is located on the inner peripheral side in the radial direction from the outer peripheral edge of the liner, and the lower hook protruding portion is provided on the inner peripheral side in the radial direction from the inner peripheral end of the upper hook. The hook portion is characterized in that a plurality of the upper hook protruding portions and the lower hook protruding portions are alternately provided one by one in the circumferential direction .

Further, the bottle with a cap of the present invention is characterized in that such a cap is attached to a cap attachment portion of the bottle body.

In the cap and the bottle with a cap configured as described above, in the hook portion of the cap, the protruding portion of the lower hook has the inner peripheral end of the lower hook of the upper hook as in the case of the bottle with the cap and the cap described in Patent Document 1. While it is located on the inner peripheral side in the radial direction with respect to the center line of the cap from the inner peripheral end, the upper hook protruding portion is the inner peripheral end of the upper hook, contrary to the cap and the bottle with a cap described in Patent Document 1. Projects to the inner peripheral side in the radial direction from the inner peripheral end of the lower hook.

Since the inner peripheral end of the upper hook of the upper hook protruding portion is located on the inner peripheral side in the radial direction from the outer peripheral edge of the liner, the liner is locked and prevented from coming off by the upper hook protruding portion. Therefore, since the liner can be locked at a position closer to the top plate of the cap body on which the liner is arranged, it is possible to securely lock the liner and prevent it from coming off from the cap body. Become.

On the other hand, when the liner in the non-adhesive state is inserted, the inner peripheral end of the lower hook protrudes toward the inner peripheral end in the radial direction from the inner peripheral end of the upper hook at the lower hook protruding portion. The lower hook elastically deforms the outer peripheral edge of the liner and guides it so that it can be inserted so as to get over the inner peripheral end of the upper hook of the upper hook protrusion, and the liner can be reliably and smoothly placed on the top plate without being caught. It can be arranged on the inner surface of the portion.

Further, since the inner peripheral end of the upper hook is located on the inner peripheral side of the inner peripheral end of the lower hook at the protruding portion of the upper hook, the inner peripheral surface of the upper hook is also included in the cross section along the center line of the cap. At the lower end, it is located on the inner peripheral side in the radial direction from the inner peripheral end of the lower hook. Therefore, when the internal pressure of the gas in the bottle is released from the vent hole when the cap is opened, the gas is discharged from the vent hole, while the contents to be discharged together with the gas protrude from the upper hook. The inner peripheral surface of the upper hook of the part and the inner peripheral surface of the lower hook of the lower hook protrusion can be guided and stayed in the cap body, and the contents are splashed with gas and leak from the vent hole. It is possible to prevent the hand of the person who opened the bottle from becoming dirty.

Further, since the inner peripheral end of the upper hook is located on the inner peripheral side of the inner peripheral end of the lower hook in the protruding portion of the upper hook, the cap is attached to the cap attachment portion of the bottle body such as a bottle can with a screw. In this state, when the cleaning water is sprayed toward the vent hole, the cleaning water travels along the outer peripheral surface of the upper hook of the upper hook protruding portion bent in the radial inward direction, and from the vent hole to the cap mounting portion of the bottle body. It is injected into the male thread part. Therefore, it is possible to reliably wash the beverage or the like adhering to the male screw portion with the washing water when the contents of the bottle are filled.

In the above hook portion, one upper hook protrusion and a plurality of lower hook protrusions are lined up in the circumferential direction of the cap body, or conversely, a plurality of upper hook protrusions and one lower hook protrusion are arranged. The upper hook protrusions and the lower hook protrusions may be arranged side by side, or a plurality of upper hook protrusions and a plurality of lower hook protrusions may be arranged side by side. It is desirable that the hook protrusions and the lower hook protrusions are alternately provided one by one in the circumferential direction.

Further, in the hook portion, the radius from the cap center line to the inner peripheral end of the lower hook in the lower hook protruding portion is larger than the radius from the cap center line to the inner peripheral end of the upper hook in the upper hook protruding portion. By making the size smaller, when the liner is inserted, the outer peripheral edge of the liner is elastically deformed to a greater extent to prevent the liner from being caught in the protruding portion of the upper hook, and it is possible to promote smoother insertion.

As described above, according to the present invention, the liner can be reliably locked to the cap body at the upper hook protruding portion of the hook portion to prevent the liner from coming off, and the liner can be smoothly inserted by the lower hook protruding portion. Furthermore, even if the internal pressure inside the bottle is released when the cap is opened, the contents can be prevented from leaking as droplets along with the gas and the hands of the person who opened the bottle can be prevented from becoming dirty, and with screws. Even if the contents adhere to the male screw portion at the time of filling in the bottle can, etc., it is possible to reliably wash the contents by injecting cleaning water from the vent hole.

It is a partial fracture side sectional view of the cap body which shows one Embodiment of the cap of this invention. FIG. 5 is a bottom view of the embodiment shown in FIG. 1 as viewed from the inner surface (lower surface) side of the top plate portion. FIG. 5 is an enlarged cross-sectional view of the V portion in FIG. 1 (or a ZZ cross-sectional view in FIG. 4). It is an enlarged bottom view of the W part in FIG. It is an enlarged cross-sectional view (or ZZ cross-sectional view in FIG. 6) of the XX part in FIG. It is an enlarged bottom view of the Y part in FIG.

1 to 6 show an embodiment of the cap of the present invention. The cap of the present embodiment is a cap for a screwed bottle can having a cap mounting portion on which a male screw portion is formed, and is formed of a metal material such as aluminum or an aluminum alloy and has a cap center line O as a center. It is provided with a bottomed cylindrical cap body 1. That is, in the cap main body 1, the disk-shaped top plate portion 2 and the outer periphery of the top plate portion 2 toward the lower end side of the cap main body 1 (lower side in FIGS. 1 and 3 and 5) are described above. A peripheral wall portion 3 extending in a cylindrical shape centered on the cap center line O is integrally formed.

Further, a resin disk-shaped liner 4 is arranged on the inner surface (lower surface) 2a of the top plate portion 2. The liner 4 is made of a hard resin mainly made of polyethylene or polypropylene, and has a large-diameter sliding layer 4a arranged on the top plate portion 2 side in a non-adhesive state with the inner surface 2a, and the top plate portion of the sliding layer 4a. It has a multi-layer structure provided with a sealing layer 4b made of a resin softer than the sliding layer 4a of the elastomer resin and having a small diameter, which is arranged directly on the opposite side of 2 or via an intermediate layer such as a barrier layer. The sliding layer 4a has a flat plate shape having a substantially uniform thickness, while the sealing layer 4b has a thick outer peripheral edge and a thin inner peripheral portion recessed toward the top plate portion 2. The stepped portion between the outer peripheral edge portion and the outer peripheral edge portion has a tapered surface shape toward the top plate portion 2 side toward the inner peripheral side.

The peripheral wall portion 3 of the cap body 1 is connected to the upper end portion side closer to the top plate portion 2 and the knurl 5 that swells toward the lower end side toward the outer peripheral side with respect to the cap center line O, and the lower end portion of the nar 5. A groove 6 having a smaller outer diameter than that of the groove 6 is formed. On the other hand, on the lower end side of the peripheral wall portion 3 on the opposite side of the top plate portion 2, a bead 7 that also swells toward the outer peripheral side in order from the upper end side to the lower end side, and an outer diameter larger than this bead 7 A fragile portion 8 having a small diameter and a cylindrical flare (open end portion) 9 having an outer diameter larger than that of the fragile portion 8 and extending to the lower end of the cap body 1 are formed.

In the fragile portion 8, a plurality of slit portions 8a extending in the circumferential direction in the side view and recessing on the inner peripheral side in the radial direction with respect to the cap center line O are formed at equal intervals in the circumferential direction, and these slit portions 8a are formed. The portion between them is a bridge portion 8b. In the slit portion 8a, a slit 8c penetrating the peripheral wall portion 3 is formed on the long side of the slit portion 8a on the upper end side. Further, when capping the bottle can to the cap mounting portion, the flare 9 is hem-wound around the lower end portion of the bulging portion formed on the lower end side of the male screw portion of the cap mounting portion.

Further, the portion between the groove 6 on the upper end side and the bead 7 on the lower end side of the peripheral wall portion 3 is screwed into the male screw portion of the cap mounting portion when the bottle can is capped to the cap mounting portion. The female screw forming planned portion 10 is set so that the female screw portion is formed. The outer diameter of the female screw forming portion 10 is set to be a substantially constant outer diameter that is larger than the outer diameter of the groove 6 and smaller than the outer diameter of the bead 7.

On the other hand, in the knurl 5, a plurality of knurl recesses 5a formed so that the peripheral wall portion 3 of the cap body 1 is recessed in the inner peripheral side are formed at equal intervals in the circumferential direction (12 in the present embodiment). There is. These knurled recesses 5a are for increasing the frictional resistance between the cap body 1 and the finger gripping the cap body 1 when the cap body 1 capped in the bottle can is opened, thereby slipping the hand. The cap can be easily opened without being squeezed.

Further, in the circumferential direction, between these knurl recesses 5a, a teardrop shape, a circular shape or an elliptical shape as shown in FIG. 1 when viewed from the outer peripheral side is formed, and the cap body 1 is also recessed on the inner peripheral side. Then, the vent hole 11 extending in the circumferential direction in a slit shape and penetrating the peripheral wall portion 3 as shown in FIG. 3, and the upper opening and the lower opening of the vent hole 11 are radially inner circumferences with respect to the cap center line O. A plurality of hook portions 14 (12 in this embodiment) having an upper hook 12 and a lower hook 13 bent on the side (right side in FIG. 3) are formed. In the present embodiment, the hook portions 14 are also formed at equal intervals in the circumferential direction, and a plurality of hook portions 14 are alternately formed at equal intervals in the circumferential direction with the knurl recesses 5a.

Then, in these hook portions 14, as shown in FIGS. 3 and 4, the inner peripheral end 12a of the upper hook 12 is outside the liner 4 in a state where the liner 4 is arranged coaxially with the cap center line O. The upper hook projecting portion 14A located on the inner peripheral side in the radial direction from the peripheral edge (outer peripheral edge of the sliding layer 4a) and on the inner peripheral side in the radial direction from the inner peripheral end 13a of the lower hook 13 and FIG. And as shown in FIG. 6, in the same state where the liner 4 is arranged coaxially with the cap center line O, the inner peripheral end 13a of the lower hook 13 is located on the inner peripheral side in the radial direction from the outer peripheral edge of the liner 4, and is on the upper side. A lower hook projecting portion 14B located on the inner peripheral side in the radial direction with respect to the inner peripheral end 12a of the hook 12 is provided.

Here, in the present embodiment, a plurality of (six) upper hook protrusions 14A and lower hook protrusions 14B are alternately provided one by one with a knurl recess 5a in between in the circumferential direction. Further, the radius RB from the cap center line O to the inner peripheral end 13a of the lower hook 13 protruding in the radial inner peripheral side in the lower hook protruding portion 14B is the radial inner circumference in the upper hook protruding portion 14A from the cap center line O. The radius RA of the upper hook 12 protruding to the side to the inner peripheral end 12a is smaller than the radius RA, that is, the inner peripheral end 13a of the lower hook 13 in the lower hook protruding portion 14B is inside the upper hook 12 in the upper hook protruding portion 14A. It protrudes more toward the inner peripheral side in the radial direction than the peripheral end 12a.

In the present embodiment, the inner peripheral end 13a of the lower hook 13 of the upper hook protruding portion 14A and the inner peripheral end 12a of the upper hook 12 of the lower hook protruding portion 14B are also the outer peripheral edge of the liner 4 (the outer peripheral edge of the sliding layer 4a). ) Is located on the inner circumference side in the radial direction. Further, the inner peripheral end 12a of the upper hook 12 of the upper hook protruding portion 14A projecting to the inner peripheral side in the radial direction and the inner peripheral end 13a of the lower hook 13 of the lower hook protruding portion 14B are the sealing layer 4b of the liner 4. It is located on the outer peripheral side in the radial direction from the outer peripheral edge.

Further, in the present embodiment, as shown in FIGS. 3 and 5, the lower hook 13 is only bent to the inner peripheral side in the radial direction so that the lower opening of the vent hole 11 is convex toward the outer peripheral side. On the other hand, the upper hook 12 bends the upper opening of the vent hole 11 to the inner peripheral side in the radial direction so as to be convex to the outer peripheral side, and then bends the lower end portion to the outer peripheral side with respect to the upper end portion. It is formed so as to extend toward the inner peripheral side in the radial direction toward the lower end side while being bent downward.

Furthermore, as also shown in FIGS. 3 and 5, in the present embodiment, the radius of the upper hook protruding portion 14A and the lower hook protruding portion 14B from the cap center line O to the inner peripheral end 12a of the upper hook 12 The RAs are equal to each other, and the radius RB from the cap center line O to the inner peripheral end 13a of the lower hook 13 has a different size. The inner peripheral end 13a of the lower hook 13 projects to the inner peripheral side in the radial direction from the inner peripheral end 13a of the hook 13, and the inner peripheral end 13a of the lower hook 13 projects to the inner peripheral side in the radial direction from the inner peripheral end 12a of the upper hook 12 in the lower hook protruding portion 14B. I have to.

However, contrary to this, the upper hook protruding portion 14A and the lower hook protruding portion 14B make the radius RB from the cap center line O to the inner peripheral end 13a of the lower hook 13 equal to each other, and are above the cap center line O. The radius RA up to the inner peripheral end 12a of the hook 12 may have different sizes. Further, the radius RA from the cap center line O to the inner peripheral end 12a of the upper hook 12 and the radius RB from the cap center line O to the inner peripheral end 13a of the lower hook 13 are formed by the upper hook protrusion 14A and the lower hook protrusion. The sizes of the parts 14B may be different from each other.

In order to manufacture the cap body 1 of such a cap for a bottle can, first, a rolled plate material having a predetermined original plate thickness made of a metal material such as aluminum or an aluminum alloy is punched into a disk-shaped blank material, and this blank material is used. The outer peripheral portion of the die is arranged on the upper surface of the die having a circular hole and is sandwiched and supported between the circular hole and the presser having a coaxial circular hole, and the circular hole of the presser is cylindrical to the circular hole of the die. It is narrowed down by inserting a punch to form a bottomed cylindrical cap shell.

At this time, the thickness of the top plate portion of the cap shell, which is the top plate portion 2 of the cap body 1, is substantially equal to the original plate thickness of the rolled plate material. Further, when molding the cap shell, at the same time, the open end portion of the cap shell is trimmed to align the height in the O direction of the cap center line. After that, a knurl 5 having a knurl recess 5a and a hook portion 14, a fragile portion 8 having a groove 6, a bead 7, and a slit portion 8a, a flare 9, and a female screw will be formed on the peripheral wall portion of the cap shell. By molding the portion 10, the cap body 1 as described above is manufactured.

Further, in order to dispose the liner 4 on the inner surface 2a of the top plate portion 2 of the cap body 1, for example, the liner 4 which has a multilayer structure as described above and is cut into a disk shape is elastically deformed. While doing so, the hook portion 14 is inserted between the inner peripheral end 12a of the upper hook 12 and the inner peripheral end 13a of the lower hook 13 and inserted into the inner surface 2a side of the top plate portion 2 in the cap body 1. Alternatively, as described in Patent Document 1, the sliding layer 4a of the liner 4 cut into a disk shape is inserted into the inner surface 2a side of the top plate portion 2 in the cap body 1 and then molded. A mold is inserted into the cap body 1, and the sealing layer 4b is molded by this mold. Alternatively, for example, as described in Japanese Patent Application Laid-Open No. 2015-003325, the sliding layer 4a and the sealing layer 4b of the liner 4 may be molded in this order using a mold for molding, respectively. ..

Further, in order to cap the cap body 1 on which the liner 4 is arranged in this way on a bottle body such as a bottle can to produce a bottle with a cap according to an embodiment of the present invention, the contents such as a beverage are filled. The cap body 1 is put on the cap mounting portion of the bottle body, and the outer peripheral portion of the upper surface of the top plate portion 2 is pressed against the opening edge of the cap mounting portion by the pusher block of the capping device to draw the liner 4. The thick outer peripheral edge of the sealing layer 4b is crimped to the opening edge.

Then, in this state, the flare 9 of the cap body 1 is hem-wound around the lower end of the bulging portion of the cap mounting portion by the hem winding roller of the capping device, and the bottle body has a male screw portion in the cap mounting portion. In the case of a screwed bottle can or the like, the thread cutting roller is spirally moved along the thread valley portion of the male thread portion to spirally move the female thread to the female thread forming portion 10 of the cap body 1. Mold the part. As a result, the cap body 1 is screwed to the cap mounting portion to seal the inside of the bottle body, and the bottle with a cap according to the embodiment of the present invention is manufactured.

In the cap having the above configuration and the bottle with a cap to which the cap is attached to the cap attachment portion of the bottle body as described above, the upper opening of the vent hole 11 is centered on the cap at the upper hook protrusion 14A of the hook portion 14 in the cap. The inner peripheral end 12a of the upper hook 12 bent in the radial inner peripheral side with respect to the line O is located on the inner peripheral side of the inner peripheral end 13a of the lower hook 13 in which the lower opening is bent in the radial inner peripheral side. The upper hook 12 protrudes from the lower hook 13 toward the inner peripheral side in the radial direction. The inner peripheral end 12a of the upper hook 12 is located on the inner peripheral side in the radial direction from the outer peripheral edge of the liner 4 arranged between the upper hook 12 and the inner surface 2a of the top plate portion 2 of the cap body 1. Therefore, the liner 4 is locked by the upper hook 12 and is prevented from coming off.

Therefore, the liner 4 is arranged as compared with the case where the tip of the upper protrusion is located at the same position in the radial direction as the tip of the lower protrusion or on the outer peripheral side in the radial direction as in the cap described in Patent Document 1. The liner 4 can be securely locked at a position closer to the top plate portion 2 of the cap body 1 to be provided. Therefore, it is possible to prevent the liner 4 from coming off from the cap body 1 when capping or opening the capped cap, and when manufacturing a bottle with a cap or when opening the cap again, the cap is capped again. When the bottle is attached to the attachment portion and resealed (closed), the inside of the bottle body can be reliably sealed.

Further, as the inner peripheral end 12a of the upper hook 12 in the upper hook protruding portion 14A is located on the inner peripheral side of the inner peripheral end 13a of the lower hook 13 in this way, the upper hook connected to the inner peripheral end 12a is connected. On the inner peripheral end 12a side of the lower end of the inner peripheral surface 12b of 12, as shown in FIG. 3 in the cross section along the cap center line O, the inner peripheral side in the radial direction from the inner peripheral end 13a of the lower hook 13 Will be located in.

Therefore, when the internal pressure of the gas in the bottle body is released from the opening edge through the vent hole 11 by releasing the crimping between the liner 4 and the opening edge of the cap mounting portion when the cap is opened, the gas itself is released. While the contents such as beverages that are to be discharged together with the gas are discharged from the vent hole 11, the contents such as beverages can be guided by the inner peripheral surface 12b of the upper hook 12 and stay in the cap main body 1. It is possible to prevent the hand of the person who opened the cap from becoming dirty due to splashing together with the gas and leaking from the vent hole 11.

Further, when such a cap is attached to the cap attachment portion of the bottle body of the bottle can with a screw as described above, when the contents such as beverages are filled in the bottle body before the cap attachment, the contents are capped. It may adhere from the outer periphery of the opening of the mounting portion to the upper end of the male screw portion. In such a case, in the cleaning step of the manufactured bottle with a cap, cleaning water is sprayed and injected from the vent hole 11 to clean the adhered contents and then dry them.

Here, even in such a case, in the cap and the bottle with a cap having the above configuration, the inner peripheral end 12a of the upper hook 12 has a radius larger than the inner peripheral end 13a of the lower hook 13 in the upper hook protruding portion 14A of the hook portion 14. Since it is located on the inner peripheral side in the direction, when the washing water is sprayed toward the vent hole 11 with the cap attached to the cap mounting portion, the washing water is bent toward the inner peripheral side in the radial direction. It is easy to be injected from the vent hole 11 between the peripheral wall portion 3 of the cap body 1 and the male screw portion of the cap mounting portion along the outer peripheral surface 12c of the above. Therefore, even if the contents such as beverages adhere to the cap mounting portion as described above, it can be reliably washed with the washing water.

On the other hand, in the cap and the bottle can with a cap having the above configuration, in the lower hook protruding portion 14B, the inner peripheral end 13a of the lower hook 13 is from the inner peripheral end 12a of the upper hook 12, contrary to the upper hook protruding portion 14A. Also protrudes toward the inner circumference in the radial direction. Therefore, when the liner 4 in the non-adhesive state is inserted and arranged on the inner surface 2a of the top plate portion 2 as described above, the lower hook protruding portion 14B protrudes on the inner peripheral side in the radial direction from the upper hook 12. The lower hook 13 can guide the outer peripheral edge of the liner 4 (outer peripheral edge of the sliding layer 4a) while elastically deforming it, and can be inserted so as to get over the inner peripheral end 12a of the upper hook 12 of the upper hook protruding portion. The liner 4 can be arranged reliably and smoothly without being caught.

In the present embodiment, the hook portion 14 is provided with a plurality of upper hook protrusions 14A and lower hook protrusions 14B alternately one by one in the circumferential direction. For example, in the hook portion 14, a cap is provided. One upper hook protrusion 14A and a plurality of lower hook protrusions 14B are alternately arranged in the circumferential direction of the main body 1, and conversely, a plurality of upper hook protrusions 14A and one lower hook protrusion 14B are alternately arranged. The upper hook protrusions 14A and the lower hook protrusions 14B may be arranged side by side, or a plurality of upper hook protrusions 14A and lower hook protrusions 14B may be arranged alternately.

However, when a plurality of upper hook protrusions 14A and lower hook protrusions 14B are arranged in this way, if the number of upper hook protrusions 14A is too large as the number of lower hook protrusions 14B, the liner When inserting 4, there is a possibility that the lower hook protrusion 14B may be caught in the portion where the lower hook protrusion 14B is not provided. On the other hand, if the number of the lower hook protrusion 14B is larger than that of the upper hook protrusion 14A, the lower hook There is a risk that the liner 4 cannot be securely locked at the portion where the protruding portion 14B is large. Therefore, in the hook portion 14, it is desirable that a plurality of upper hook protrusions 14A and lower hook protrusions 14B having the same number of each other are alternately provided one by one in the circumferential direction as in the present embodiment.

Further, in the present embodiment, in the hook portion 14, the radius RB from the cap center line O to the inner peripheral end 13a of the lower hook 13 in the lower hook protruding portion 14B is set to the radius RB from the cap center line O to the upper hook protruding portion 14A. It is made smaller than the radius RA up to the inner peripheral end 12a of 12. Therefore, when the liner 4 is inserted, the outer peripheral edge of the liner 4 (in the present embodiment, the outer peripheral edge of the sliding layer 4a) can be greatly elastically deformed so that the upper hook 12 of the upper hook protruding portion 14A can be overcome. , The liner 4 can be reliably prevented from being caught in the upper hook protruding portion 14A, and the liner 4 can be inserted more smoothly.

In the present embodiment, the knurl recesses 5a and the hook portions 14 are formed in the knurl 5 on the peripheral wall portion 3 of the cap body 1 alternately and at equal intervals in the circumferential direction. A non-forming region that is not formed is provided in the knurl 5, and a weakening slit or weakening score that is longer in the circumferential direction than the slit 5b or the vent hole 11 is formed in this non-forming region, and the weakening slit or weakening score is thinned by a recess. An opening base point portion that is further weakened than the surroundings may be provided by being formed or slitted. By providing such a weakening slit and weakening score, even when the contents in the bottle rot or ferment and the internal pressure rises after the cap is opened and then closed, the weakening slit and weakening score are provided. The cap body 1 can be provided with an explosion-proof function that releases the gas inside when the cap body 1 is expanded.

Next, an example of the present invention will be given to demonstrate the effect of the present invention. In this embodiment, a cap shell having an outer diameter of 38 mm is formed from a blank material obtained by punching a rolled plate material made of an aluminum alloy having an original plate thickness of 0.25 mm into a disk shape, and a knurl recess 5a is formed on the peripheral wall portion of the cap shell. A cap body based on the above embodiment by molding a knurl 5 having a hook portion 14, a fragile portion 8 having a groove 6, a bead 7, a slit portion 8a, a flare 9, and a female screw forming planned portion 10. 1 was manufactured.

At this time, in the first embodiment, as shown in FIGS. 1 to 6, a plurality (six) upper hook protrusions 14A and lower hook protrusions 14B are alternately formed one by one in the circumferential direction. The cap body 1 was molded. Further, as the second embodiment, a cap body 1 in which one upper hook protruding portion 14A and two lower hook protruding portions 14B are alternately formed in the circumferential direction out of a total of 12 hook portions 14 is formed, and further carried out. As an example 3, a cap body 1 in which two upper hook protrusions 14A and one lower hook protrusion 14B out of a total of 12 hook portions 14 are alternately formed in the circumferential direction is formed. Further, as Comparative Example 1 with respect to Examples 1 to 3, all the hook portions 14 of 12 are the lower hook protruding portion 14B, and as Comparative Example 2, all the hook portions 14 of 12 are the upper hook protruding portion 14A. The cap body 1 was also molded.

In Examples 1 to 3 and Comparative Examples 1 and 2, the radius RA from the cap center line O in the upper hook protruding portion 14A to the inner peripheral end 12a of the upper hook 12 and the inner peripheral end 13a of the lower hook 13 are reached. The difference from the radius RB is 0.2 mm, and the radius RA from the cap center line O in the lower hook protrusion 14B to the inner peripheral end 12a of the upper hook 12 and the radius RB to the inner peripheral end 13a of the lower hook 13 The difference was also 0.2 mm. Further, in Examples 1 to 3 and Comparative Examples 1 and 2, as shown in FIGS. 3 and 5, the upper hook protruding portion 14A and the lower hook protruding portion 14B form the inner circumference of the upper hook 12 from the cap center line O. The radius RA to the end 12a is the same, and the radius RB from the cap center line O to the inner peripheral end 13a of the lower hook 13 is different.

Then, 100 cap bodies 1 of Examples 1 to 3 and Comparative Examples 1 and 2 are formed, and between the inner surface 2a of the top plate portion 2 of the cap body 1 and the upper hook 12 in the hook portion 14. A liner 4 in which the sliding layer 4a and the sealing layer 4b are laminated in a multilayer structure is inserted in advance to manufacture a cap, and the liner insertability at that time is determined. The liner 4 is arranged coaxially with the cap center line O, and the outer peripheral edge of the sliding layer 4a is located at a position of 0.4 mm on the outer peripheral side in the radial direction from the inner peripheral end 12a of the upper hook 12. Met. Here, the liner insertability was determined by the number of caps in which the liner 4 was not locked to even one of the 12 hook portions 14 of the 100 caps manufactured. The result (the number of caps in which the liner 4 was not locked) is shown in Table 1.

Next, among the caps manufactured by inserting the liner 4 in this way, those in which the liner 4 is locked to all the hook portions 14 are actually capped to the cap attachment portions in the bottle body of the screwed bottle can. The ease of disconnection of the liner 4 from the hook portion 14 after opening the cap was compared using an index called the hook detachment frequency to determine the quality. Here, the hook disengagement frequency is the same as that described in Patent Document 1, in which the liner 4 of the 12 hook portions 14 in one cap body 1 is disengaged by visually observing the opened cap. The sum of the products of the number of parts 14 and the number of caps (number of cans) is divided by the total number of evaluated caps (total number of cans), that is, the number of hook parts with one cap on average. It indicates whether 14 has come off. This result is also shown in Table 1.

From the results of Table 1, regarding the liner insertability, in Examples 1 to 3 and Comparative Example 1, the liner 4 is not locked even in one of the 12 hook portions 14 in the 100 cap bodies 1. In Comparative Example 2, in which the inner peripheral end 12a of the upper hook 12 protruded radially inward from the inner peripheral end 13a of the lower hook 13 in all the hook portions 14, 10 caps were used. In some cases, the liner 4 was not locked to the hook portion 14, and it was confirmed that the liner 4 was incompletely inserted.

Further, the hook disengagement frequency indicating the ease of disengagement of the liner 4 from the hook portion 14 after opening is 0.1 or less in Examples 1 to 3, and the liner 4 is still disengaged from the hook portion 14 after opening. Although it was difficult to remove, it was 0.5 in Comparative Example 2 and 0.7 in Comparative Example 1, and even if it was locked to the hook portion 14 at the time of manufacturing the cap, it was compared with Examples 1 to 3 after opening. It was found that the liner 4 was several times easier to come off.

1 Cap body 2 Top plate 2a Inner surface of top plate 2 3 Peripheral wall 4 Liner 4a Sliding layer 4b Sealing layer 5 Nar 5a Nar recess 6 Groove 7 Bead 8 Breakable part 9 Flare 10 Female screw formation part 11 Vent hole 12 Upper hook 12a Inner peripheral end of upper hook 12 13 Lower hook 13a Inner peripheral end of lower hook 13 14 Hook part 14A Upper hook protruding part 14B Lower hook protruding part O Cap center line RA Cap center line O to inner hook 12 Radius to peripheral end 12a Radius from RB cap center line O to inner peripheral end 13a of lower hook 13

Claims (3)

A cap body in which a disk-shaped top plate portion centered on the cap center line and a peripheral wall portion extending cylindrically from the outer periphery of the top plate portion centering on the cap center line are integrally formed.
A cap for capping the bottle body, which is provided with a disk-shaped liner arranged on the inner surface of the top plate of the cap body.
A vent hole extending in the circumferential direction toward the top plate portion of the peripheral wall portion of the cap body and releasing the internal pressure of the gas in the bottle body when the cap is opened, and the vent hole. A plurality of hook portions having an upper hook and a lower hook in which the upper opening and the lower opening of the cap are bent radially inward with respect to the center line of the cap are formed at intervals in the circumferential direction.
In the hook portion, the inner peripheral end of the upper hook is located on the inner peripheral side in the radial direction from the outer peripheral edge of the liner, and the upper hook is located on the inner peripheral side in the radial direction from the inner peripheral end of the lower hook. The protruding portion and the inner peripheral end of the lower hook are located on the inner peripheral side in the radial direction from the outer peripheral edge of the liner, and the protruding portion of the lower hook is located on the inner peripheral side in the radial direction from the inner peripheral end of the upper hook. And are provided ,
The cap is characterized in that a plurality of the upper hook protrusions and the lower hook protrusions are alternately provided one by one in the circumferential direction. In the hook portion, the radius from the cap center line to the inner peripheral end of the lower hook in the lower hook protruding portion is larger than the radius from the cap center line to the inner peripheral end of the upper hook in the upper hook protruding portion. The cap according to claim 1, wherein the cap is small. A bottle with a cap, wherein the cap according to claim 1 or 2 is attached to a cap attachment portion of the bottle body.

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