JP4769349B2 - Resin cap for gas beverage container - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resin cap for a gas beverage container. More specifically, the present invention relates to a resin cap for a gas beverage container that can be easily degassed when the cap is opened.
[0002]
[Prior art]
Resin caps of the type that are fitted into and installed in a container mouth and are pulled out from the container mouth and opened when the contents of the container are taken out are widely applied to containers such as various beverages.
[0003]
[Problems to be solved by the invention]
By the way, this type of resin cap has a problem to be improved when applied to a container filled with a so-called gas beverage typified by carbonated beverages such as cola.
That is, in a container filled with a gas beverage, gas pressure is generated in the container. Therefore, when the resin cap fitted in the container mouth is pulled out of the container mouth, the resin cap is caused by the gas pressure in the container. May cause inconveniences such as flying away. This is because the engaging force between the resin cap and the container mouth portion gradually decreases as the resin cap is pulled out from the container mouth portion. Such inconvenience is called cap blow-off.
[0004]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a resin cap for a gas beverage container of a type that is fitted in and attached to a container mouth portion, and is pulled out from the container mouth portion and opened to effectively prevent the cap from being blown off. There is to do.
Another object of the present invention is to provide a resin cap for a gas beverage container capable of degassing the container by an extremely simple means prior to opening the cap from the container mouth.
[0005]
[Means for Solving the Problems]
According to the invention of the present application, the top surface, a fitting portion of the container mouth portion formed on the periphery of the top surface, and an outer band formed so as to surround the fitting portion and provided with an opening tab, The fitting portion includes a circumferential inner wall that is continuous with the top surface and stands upright from the periphery of the top surface, a circumferential outer wall that is positioned outside the circumferential inner wall, and the circumferential inner wall. And a connecting wall that connects the upper ends of the outer circumferential wall and the outer band is connected to the outer circumferential wall of the fitting portion via a non-breakable connecting portion and a breakable bridge. In a resin cap for a gas beverage container that is attached to a container mouth by fitting the container mouth in a space between the circumferential inner wall and the circumferential outer wall of the fitting portion,
The top surface is formed with a score breaking protrusion standing upright and a score with a line end,
The score breaking protrusion is formed at a position at least crossing a straight line connecting the center of the top surface and the center of the opening tab when viewed from above, and the opening tab side from the top surface center. And extends in a direction substantially perpendicular to a straight line connecting the center of the top surface and the center of the opening tab,
The end-like linear score extends along the root of the score breaking protrusion on the opening tab side, and further from the opposite ends along the root of the score breaking protrusion, opposite to the opening tab. The score rupture piece is pushed down in the direction opposite to the opening tab, whereby the score is broken and the container is degassed. A resin cap for a gas beverage container is provided.
[0006]
That is, according to the resin cap for gas beverages of the present invention, the score formed on the top surface is also lowered by pushing down the score breaking protrusion formed on the top surface prior to opening or simultaneously with the opening operation. Since the (gas venting score) is broken and the gas is degassed in the container, the cap is repelled by the gas pressure, that is, the blow-off of the cap is effectively prevented.
Further, in the present invention, it is important that the degassing score to be broken by pushing down the score breaking protrusion is in the form of an end line. That is, since the degassing score is broken by pushing down the score breaking protrusion, it is provided at or near the base of the protrusion. Therefore, when the degassing score is formed in a ring shape, the score breaking protrusion may fall into the container due to the breakage. Therefore, it is necessary to make this score into the end line shape.
In the present invention, the score breaking protrusion is formed at a position at least crossing with respect to a straight line connecting the center of the top surface and the center of the opening tab as viewed from above. That is, the opening of the cap is started by breaking the bridge that connects the outer band and the circumferential outer wall by lifting the outer band upward with the opening tab, and then the outer band. This is done by lifting up the unbreakable connecting portion connecting the outer circumferential wall and the outer peripheral wall. Therefore, it is easiest to perform the operations of raising the outer band with the opening tab and raising the unbreakable connecting portion with a finger at the center of the top surface. For this reason, the score breaking protrusion is formed while performing the opening operation by forming the score breaking protrusion at a position that intersects the straight line connecting the center of the top surface and the center of the opening tab. This is because it is possible to easily push down, that is, perform a gas venting operation. Therefore, in order to easily perform the gas venting operation while performing the opening operation, the score breaking projection piece extends substantially vertically with respect to a straight line connecting the center of the top surface and the center of the opening tab. Most preferably.
[0007]
Further, in the present invention, in order to easily perform the degassing operation at the initial stage of raising the outer band with the opening tab, the score breaking protrusion is closer to the opening tab than the center of the cap. In addition, it is preferable that the degassing score (end line score) extends along the opening tab side of the base of the score breaking protrusion. By forming the score breaking protrusion or degassing score at such a position, for example, hold the lower side of the opening tab with the thumb and use the index finger or the like to place the score breaking protrusion opposite the opening tab. By pulling up the opening tab while pushing down, the degassing operation can be performed very easily simultaneously with the opening of the cap.
That is, when the degassing score is formed on the side opposite to the opening tab at the base of the score breaking protrusion, the circumferential outer wall is positioned near the side where the score breaking protrusion is pushed down. For this reason, there is a possibility that it becomes difficult to effectively push down the score breaking projection piece because the circumferential outer wall gets in the way.
Also, if the degassing score is formed on the side opposite to the opening tab at the base of the score breaking protrusion, when the score breaking protrusion is pushed down to the opposite side of the opening tab, This is because the tension generated by pushing down does not sufficiently affect the score, and the score may not be effectively broken.
[0008]
In the present invention, it is preferable that the height of the above-described score breaking protrusion is lower than the circumferential inner wall constituting the fitting portion.
In other words, if the protruding piece is higher than the circumferential inner wall, there is a risk that an external force will accidentally act on the protruding piece and the degassing score may break during the flow of the cap. Such a trouble can be effectively prevented by making the height of the piece lower than the circumferential inner side wall.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on specific examples shown in the accompanying drawings.
FIG. 1 is a side cross-sectional view showing an example of a degassing resin cap of the present invention together with a container mouth part,
FIG. 2 is a bottom view of the cap of FIG.
FIG. 3 is a diagram showing a process of opening the cap of FIG.
FIG. 4 is a diagram showing a process of degassing the cap of FIG.
FIG. 5 is a diagram showing an example of manual work for opening the cap of FIG.
[0010]
1 and 2, the resin cap for a gas beverage container according to the present invention includes a top surface 1 and a fitting portion 2.
As clearly shown in FIG. 1, the fitting portion 2 includes a circumferential inner wall 5 that is spaced apart from the circumferential inner wall 5 that is erected upward from the peripheral edge of the top surface, and the circumferential inner wall 5. The outer peripheral wall 6 is provided on the outer side of the outer peripheral wall 6, and the connecting wall 7 connects the upper end of the inner peripheral wall 5 and the upper end of the outer peripheral wall 6.
That is, as apparent from FIG. 1, the container mouth portion 50 is fitted into the space between the circumferential inner side wall 5 and the circumferential outer wall 6, whereby the resin cap is attached to the container mouth portion 50. The A circumferential projection 8 that engages with the container mouth portion 50 is formed below the inner surface of the circumferential outer wall 6, and the resin cap is formed by the engagement between the circumferential projection 8 and the container mouth portion 50. Is firmly fixed to the container mouth portion 50.
[0011]
In addition, a plurality of slits 10 extending upward from the lower end are formed at appropriate intervals at the lower portion of the circumferential outer wall 6, and such slits 10 form a tag that is an outer band described below. When the opening operation is performed by raising the fastening band 15, the outer circumferential wall 6 is easily opened to the outside so that the cap can be easily detached from the container mouth portion 50.
[0012]
A tag fastening band 15 is connected to the lower outer surface of the outer circumferential wall 6 by a strong connecting portion 11 and a plurality of breakable bridges 12 provided at appropriate intervals. The fastening band 15 is provided with a tab 16 for opening at a position opposite to the strong connecting portion 11.
Further, as is apparent from FIGS. 1 and 2, the inner surface of the tag fastening band 15 and the outer surface of the circumferential outer wall 6 are a cutter or the like except for a portion where the connecting portion 11 and the bridge 12 are formed. The cut surface 20 is formed by post-processing (cutting processing) or the like using.
[0013]
That is, in the resin cap of FIGS. 1 and 2, when the container cap 50 is plugged, the container mouth 50 is inserted into the space between the circumferential outer wall 6 and the circumferential inner wall 5. Therefore, although the outer circumferential wall 6 spreads outward, it is protected by the above-described tag fastening band 15, so there is no possibility that the circumferential outer wall 6 spreads outside more than necessary. Inconveniences such as deformation of the wall 6 are effectively prevented.
In particular, as described above, when the band 15 is cut by post-processing using a cutter or the like, the band 15 and the circumferential outer wall 6 are in close contact with each other, so that the container after the stopper is tightened. It becomes strong and sealability is maintained.
[0014]
The resin cap described above can be easily pulled out from the container mouth portion 50 as shown in FIG.
That is, holding the opening tab 16 of the tag fastening band 15 and raising it upward, the bridge 12 connecting the tag fastening band 15 and the circumferential outer wall 6 is broken and raised up. The band 15 is connected to the outer circumferential wall 6 by the connecting portion 11.
As a result, the circumferential outer wall 6 is released from the tagging force, and the engagement force between the circumferential outer wall 6 and the container mouth portion 50 is reduced. Therefore, the resin cap can be easily pulled out from the container mouth 50 by holding the raised band 15 and pulling the circumferential outer wall 6 upward with the connecting portion 11 as a fulcrum. .
[0015]
By the way, in the above-mentioned resin cap applied to the gas beverage container, as shown in FIG. 3, when the band 12 for scooping up is lifted and the bridge 12 is broken, the circumferential outer wall 6 is released from the tag fastening force, Since the engagement force between the circumferential outer wall 6 and the container mouth portion 50 is reduced, the resin cap is in a state where it can be easily removed from the container mouth portion 50. Therefore, when the gas pressure in the container becomes abnormally high, there is a possibility that the blow-off problem that the resin cap is bounced off may occur.
However, according to the present invention, as shown in FIG. 1 and FIG. 2, the score breaking projection 30 standing upright on the top surface 1, and the degassing score at the root of the projection 30. By providing 31, it is possible to easily degas the container prior to opening the resin cap, and it is possible to effectively prevent blow-off of the cap that occurs when the resin cap is opened.
[0016]
That is, as shown in FIG. 4 showing the degassing process using the protrusion 30 and the score 31, the protrusion 30 is pushed down with the finger in the direction opposite to the opening tab 16, The score 31 is broken, and as a result, degassing of the container is performed. Therefore, simultaneously with the pulling-up of the opening tab 16 as shown in FIG. 3, the gas can be easily vented by pushing down the protruding piece 30 as shown in FIG. 4 with a finger.
[0017]
In the present invention, the above-described score breaking protrusion 30 is located closer to the opening tab 16 than the top surface center X as clearly shown in FIG. It is preferable to extend in a substantially vertical direction with respect to a straight line L connecting the center Y. That is, by disposing the score breaking protrusion 30 at such a position, the protrusion 30 can be easily pushed down at the same time as the opening operation for pushing up the opening tab 16 with a finger. For example, when the projecting piece 30 is located on the opposite side of the top surface center X from the opening tab 16, the gap between the projecting piece 30 and the opening tab 16 becomes large. There is a possibility that it is difficult to break the degassing score 31 by pushing down the protruding piece 30 in the initial stage (that is, degassing the container). Further, even when the directing direction of the projecting piece 30 does not extend in the direction perpendicular to the straight line L, it may be difficult to push down the projecting piece 30 while lifting the opening tab 16.
[0018]
In the present invention, the score breaking protrusion 30 is preferably located closer to the opening tab 16 than the top surface center X. However, if it is provided closer to the opening tab 16 than necessary. The circumferential inner wall 5 becomes an obstacle, and it is difficult to push down the protruding piece 30 with a finger. Therefore, it is preferable to provide an interval between the projecting piece 30 and the circumferential inner wall 5 on the opening tab 16 side so that a finger can be inserted.
[0019]
In the present invention, it is most preferable that the degassing score 31 extends along the root of the score breaking protrusion 30 on the opening tab 16 side, as is apparent from FIG.
That is, when the score 31 extends along such a base portion, the score 31 is surely broken and degassing is performed by pushing down the projecting piece 30 to the side opposite to the opening tab 16. . For example, if the score 31 extends along the base on the side opposite to the opening tab 16, the tension is sufficiently applied to the score 31 when the projecting piece 30 is pushed down in the direction opposite to the opening tab 16. Otherwise, a breakage failure of the score 31 may occur.
[0020]
In the above-described embodiment, the score breaking protrusion 30 is described as being located closer to the opening tab 16 than the top surface center X. However, the present invention is not limited to this. When the fastening band 15 is lifted to break the bridge 12, and then the band 15 is further lifted and the circumferential outer wall 6 is removed from the container mouth portion 50, when the opening tab 16 is pushed down, the score breaks. The projecting piece 30 is provided on the connecting portion 11 side of the top surface center X, and extends in a substantially vertical direction with respect to a straight line L connecting the top surface center X and the center Y of the opening tab 16. It is preferable.
In this case, it is preferable that the score 31 is provided along the base portion on the connecting portion 11 side of the projecting piece 30 in order to easily break the score 31.
The removal of the cap from the container mouth portion 50 with the band 15 lifted by breaking the bridge 12 differs depending on the size of the cap, but for example, as shown in FIG. It can be performed by pulling up the connecting portion 11 through the band 15 while hooking and pressing the upper end of the fitting portion 2 opposite to the connecting portion 11 side with the thumb. Therefore, when the score breaking protrusion 30 or the score 31 is formed at the position as described above, the score 31 can be easily broken by pushing the protrusion 30 to the connecting portion 11 side with a thumb or the like during the manual operation. Can be done.
[0021]
Further, in the present invention, the score breaking score 31 is also required to be end-lined. That is, if the score 31 is endless (that is, ring-shaped), even if the score 31 extends along the root portion on the opening tab 16 side of the protruding piece 30 as described above, The protrusion 30 may fall into the container, or the strength of the portion surrounded by the score 31 may decrease, and the score 31 may be broken by the gas pressure in the container to impair the sealing performance.
[0022]
Further, in the present invention, in order to facilitate the breaking of the score 31, as shown in FIGS. 1 and 2, a thick wall is formed in the central portion of the projecting piece 30 (particularly on the opening tab 16 side). It is preferable to form the part 30a. By forming such a thick portion 30a, stress concentrates on the portion of the score 31 corresponding to the thick portion 30a, and the score 31 can be easily broken.
[0023]
The above-described resin cap of the present invention uses various plastics, for example, low-, medium- or high-density polyethylene, linear low-density polyethylene, polypropylene, thermoplastic polyester, polyamide, styrenic resin, ABS resin, and the like. It can be easily manufactured by integral molding such as injection molding or compression molding. In addition, although the above-described tag fastening band 15 is formed by forming the cut surface 20 by cutting using a cutting blade after integral molding, when a sufficient tag fastening force is not required, The band 15 can be simultaneously formed by integral molding.
[0024]
【The invention's effect】
According to the present invention, in a resin cap for a gas beverage container of a type that is fitted in and attached to a container mouth portion, and is pulled out from the container mouth portion and opened, a score breaking piece at a predetermined position on the top surface In addition, by providing the end-lined degassing score extending along the base of the projecting piece, the degassing of the container can be easily performed simultaneously with the opening operation of the cap container. Can be effectively prevented.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an example of a degassing resin cap according to the present invention together with a container mouth portion.
2 is a bottom view of the cap of FIG. 1. FIG.
FIG. 3 is a diagram showing a process of opening the cap of FIG. 1;
4 is a view showing a process of degassing the cap of FIG. 1;
FIG. 5 is a diagram showing an example of manual work for opening the cap of FIG. 1;
[Explanation of symbols]
1: Top surface 2: Fitting part 5: Circumferential inner wall 6: Circumferential outer wall 10: Slit 11: Strong connection part 12: Bridge 15: Hook band 16: Opening tab 20: Cut surface 30: Score breaking protrusion 31: Degassing score

Claims (2)

A top part, and a fitting part between the container mouth part formed on the periphery of the top part, and an outer band formed to surround the fitting part and provided with a tab for opening,
The fitting portion includes a circumferential inner wall that is continuous with the top surface and stands upright from the periphery of the top surface, a circumferential outer wall that is positioned outside the circumferential inner wall, and the circumferential inner wall. And a connecting wall connecting the upper ends of the circumferential outer wall and
The outer band is provided on the circumferential outer wall of the fitting portion via a non-breakable connecting portion and a breakable bridge,
In the resin cap for a gas beverage container to be attached to the container mouth by fitting the container mouth into the space between the circumferential inner side wall and the circumferential outer wall of the fitting portion,
The top surface is formed with a score breaking protrusion standing upright and a score with a line end,
The score breaking protrusion is formed at a position at least crossing a straight line connecting the center of the top surface and the center of the opening tab when viewed from above, and the opening tab side from the top surface center. And extends in a direction substantially perpendicular to a straight line connecting the center of the top surface and the center of the opening tab,
The end-like linear score extends along the root of the score breaking protrusion on the opening tab side, and further from the opposite ends along the root of the score breaking protrusion, opposite to the opening tab. The score rupture piece is pushed down in the direction opposite to the opening tab, whereby the score is broken and the container is degassed. Resin cap for gas beverage containers.   The resin cap for a gas beverage container according to claim 1, wherein a height of the score breaking protrusion is set lower than the circumferential inner wall.

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