JP4447749B2 - Resin cap applied to gas beverage containers - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a resin cap applied to a gas beverage container, and more particularly to a resin cap for a gas beverage container that can easily degas the container 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 gas beverage, when the internal pressure rises abnormally due to storage conditions etc. There is a risk of inconvenience such as the resin cap popping off. 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]
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 and is pulled out from the container mouth to open the container prior to opening the cap from the container mouth. An object of the present invention is to provide a resin cap for a gas beverage container in which the gas can be vented by an extremely simple means and the blow-off of the cap is effectively prevented.
[0005]
[Means for Solving the Problems]
According to the present invention, it consists of a top wall and a fitting part with a container mouth formed on the periphery of the top wall,
The fitting portion includes a circumferential inner wall that is connected to the top wall and is erected upward from the periphery of the top surface, and a circumferential outer wall that is located outside and spaced apart from the circumferential inner wall and includes an opening tab. And a connecting wall that connects the upper ends of the circumferential inner wall and the circumferential outer wall,
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,
In the top wall, an opening sealed with a button member is formed, and a portion of the top wall forming the opening descends downward to form a circumferential foot.
The button member includes a ceiling wall, a cylindrical wall hanging from the periphery of the ceiling wall, and a flange wall extending radially outward from the lower end of the cylindrical wall and having a tip portion extending upwardly. A recessed portion for fitting is formed by the lower portion of the cylindrical wall and the flange wall, and the button member seals the opening of the top surface wall by fitting the circumferential foot portion of the top wall into the recessed portion for fitting. And is fixed to
In the state of sealing the opening of the top wall, the ceiling wall of the button member is located at a position lower than the upper end of the circumferential inner wall,
At least one degassing small protrusion is formed on the outer surface of the cylindrical wall and at a position where the length from the lower end of the cylindrical wall is larger than the length of the circumferential leg portion of the top wall. By pressing the ceiling wall of the button member fixed so as to seal the opening of the face wall, the small vent for gas venting comes into contact with the inner surface of the circumferential foot portion to form a gas vent passage. A resin cap for a gas beverage container is provided.
[0006]
That is, according to the resin cap for gas beverage of the present invention, degassing can be easily performed by pushing the button member sealing the opening formed in the ceiling wall of the cap prior to opening. . That is, the button member is lowered by pushing the ceiling wall of the button member with a finger, and at this time, the small vent for gas venting formed on the outer surface of the cylindrical wall is formed in the circumferential shape of the top wall. Abutting on the inner surface of the foot portion, as a result, a gas vent passage is formed, and gas is vented from the container. Therefore, when the cap is subsequently removed from the container mouth, the cap is repelled by the gas pressure, that is, the blow-off of the cap is effectively prevented.
[0007]
In the present invention, in the state where the opening of the top wall is sealed, the ceiling wall of the button member needs to be positioned at a position lower than the upper end of the circumferential inner wall. That is, if the ceiling wall of the button member is positioned higher than the circumferential inner wall, an external force will accidentally act on the ceiling wall of the button member during the cap distribution process, and the button member will be pushed in. This is because a gas vent passage is formed and the sealing performance of the cap is impaired.
[0008]
According to the present invention, it is preferable to form a circumferential recess on the inner surface of the circumferential foot. In particular, when the button member is pushed to a position where the ceiling wall is approximately the same height as the top wall, the circumferential recess may be formed so that the small venting projection is engaged with the circumferential recess. preferable. That is, by forming such a circumferential recess, when the button member that seals the opening of the top wall is pushed in, the degassing projection provided on the outer surface of the cylindrical side wall of the button member This is because it engages with the circumferential recess, and as a result, the button member is fixed in position without falling into the container.
[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 sectional view showing an example of a resin cap for a gas beverage container according to the present invention together with a container mouth portion,
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 degassing operation process of the cap of FIG.
FIG. 5 is a view showing a main part of a preferred example of the cap of the present invention.
[0010]
1 and 2, the resin cap for a gas beverage container according to the present invention includes a top wall 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 periphery of the top wall 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 the outer band 15 described below is wound by such slits 10. When performing the unsealing operation, the outer circumferential wall 6 is easily opened to the outside so that the cap can be easily removed from the container mouth portion 50.
[0012]
An outer band 15 is connected to the lower outer surface of the circumferential outer wall 6 by a strong connecting portion 11 and a plurality of breakable bridges 12 provided at appropriate intervals. Is provided with a tab 16 for opening at a position opposite to the strong connecting portion 11.
1 and 2, the inner surface of the outer band 15 and the outer surface of the circumferential outer wall 6 use a cutter or the like except for the 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.
[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 outside, the circumferential outer wall 6 is protected by the outer band 15 described above, so there is no possibility that the circumferential outer wall 6 spreads outside more than necessary. Inconveniences such as deformation are effectively prevented.
In particular, as described above, when the band 15 is formed by post-processing (cutting) 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 plugging The tightening with respect to becomes stronger and the sealing performance is improved.
[0014]
The resin cap described above can be easily pulled out from the container mouth portion 50 as shown in FIG.
That is, when holding the opening tab 16 of the band 15 and raising it upward, the bridge 12 connecting the band 15 and the circumferential outer wall 6 is broken, and the band 15 raised upward is connected to the band 15. The portion 11 is connected to the circumferential outer wall 6.
As a result, the circumferential outer wall 6 is released from the tightening force (tagging force) by the band 15, 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 band 15 that has been swung up and pulling the circumferential outer wall 6 upward with the connecting portion 11 as a fulcrum.
[0015]
By the way, in said resin cap applied to a gas beverage container, as shown in FIG. 3, when the band 15 is raised and the bridge 12 is broken, the circumferential side wall 6 is released from the tagging force, and the circumferential outer wall Since the engaging force between 6 and the container mouth portion 50 is reduced, the resin cap is in a state where it is very easily removed from the container mouth portion 50. Therefore, when the gas pressure in the container becomes abnormally high, there is a risk of causing a blow-off problem that the resin cap is bounced off.
However, according to the present invention, as shown in FIGS. 1 and 2, the opening 30 is formed in the top wall 1, and the button member 31 is provided so as to seal the opening 30. This is a solution to this problem.
[0016]
That is, in the present invention, a circumferential foot portion 32 is formed on the top wall 1, and an opening 30 is formed by the circumferential foot portion 32.
The button member 31 that seals the opening 30 includes a ceiling wall 35, a cylindrical wall 36 that hangs from the periphery of the ceiling wall 35, and a distal end that extends radially outward from the lower end of the cylindrical wall 36. The part consists of a flange wall 37 extending upward.
[0017]
In particular, as is apparent from FIG. 1, the upper surface of the ceiling wall 35 of the button member 31 is slightly recessed so that it can be easily pressed with a finger.
A fitting recess 40 is formed by the lower portion of the cylindrical wall 36 and the flange wall 37, and the button member 31 is formed by fitting the circumferential foot 32 of the top wall 1 into the fitting recess 40. Is fixed so as to seal the opening 30 of the top wall 1.
[0018]
On the outer surface of the cylindrical wall 36 of the button member 31, three small gas venting projections 41 are provided symmetrically at equal intervals, as is apparent from FIG. 2.
As shown in FIG. 1, the length D between the gas venting small projection 41 and the lower end of the cylindrical wall 36 is slightly longer than the length L of the circumferential foot portion 32, and thus the button member 31. In the state where the opening 30 is sealed, the small vent 41 for gas venting is located slightly above the top wall 1. By providing the gas venting small projection 41 at such a position, the button member 31 can be reliably held in the opening 30.
[0019]
Degassing using the button member 31 provided with such a small projection 41 for degassing is performed by pressing the ceiling wall 35 of the button member 31 with a finger as shown in FIG. It can be easily done by pushing it in.
That is, by pushing the button member 31, the gas venting small projection 41 descends and comes into contact with the inner surface of the circumferential foot portion 32. Accordingly, a gas vent passage is formed between the outer surface of the cylindrical wall 36 of the button member 31 and the inner surface of the circumferential foot portion 32, and the gas is vented from the container.
As a result, when the cap is removed from the container opening 50 by pulling up the opening tab 16 as shown in FIG. 3, the cap is effectively prevented from being blown off (blow-off) by the gas pressure in the container. It is.
[0020]
In the present invention described above, as clearly shown in FIG. 1, when the button member 31 seals the opening 30, the ceiling wall 35 of the button member 31 is positioned lower than the upper end of the circumferential inner wall 5. Should be large enough. That is, when the ceiling wall 35 is positioned higher than the upper end of the circumferential inner wall 5, the button member 31 is pushed in due to an accidental external force in the stage of the cap distribution process or the like, so that the gas vent passage is formed. This is because the sealing performance of the cap is impaired.
[0021]
In FIG. 5 showing a preferred example of the cap of the present invention, in the present invention, a circumferential recess 45 can be formed at an appropriate position on the inner surface of the circumferential foot 32 forming the opening 30. . In particular, when the button member is pushed to a position where the ceiling wall 35 is approximately the same height as the top wall 1, a circumferential recess is formed so that the gas venting small projection 41 engages with the circumferential recess 45. It is preferable to keep it.
By forming such a circumferential recess 45, when the button member 31 is pushed in, the lowered gas venting small projection 41 engages with the circumferential recess 45, and the button member 31 is fixed in position. Gas can be vented during this time. Therefore, it is possible to effectively prevent a trouble that the button member 31 falls into the container due to the pressing of the button member 31.
[0022]
In the present invention described above, the positions of the opening 30 formed in the top wall 1 and the button member closing the opening 30 are not particularly limited, but the appearance of the cap is not impaired and the button member 31 can be easily pushed. From the viewpoint of performing, it is preferable that these are located on a line connecting the center X of the top surface wall and the center Y of the opening tab 16. In particular, the center of the opening 30 and the button member 31 is the center X of the top surface wall 1. Preferably.
[0023]
The above-described resin cap of the present invention uses various plastics such as 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. The outer band 15 described above is formed by forming the cut surface 20 by a cutting process using a cutting blade (cutter) after integral molding, but when a sufficient tagging force is not required, The band 15 can also be formed simultaneously by integral molding.
[0024]
Further, in the example of the resin cap of the present invention described above, three gas venting small projections 41 are provided on the outer surface of the cylindrical wall 36, but the number of the small projections 41 is not limited to this. However, as long as the gas vent passage is reliably formed by contact with the inner surface of the circumferential foot portion 32, the number may be one or two, or may be three or more. Or the shape of this small protrusion 41 can also be made into the arc-shaped shape extended in the circumferential direction.
In the above-described example, the outer band 15 is formed at the lower end portion of the circumferential outer wall 6. However, such a band 15 is not formed, and the opening tab 16 is directly formed on the circumferential outer wall 6. It goes without saying that the present invention can be applied to a type of cap provided with.
[0025]
【The invention's effect】
According to the present invention, prior to pulling out the cap from the container mouth, the cap is blown off effectively by degassing the container by forming a gas vent passage by pushing the button member. Can do.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an example of a resin cap for a gas beverage container 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 view showing a main part of a preferred example of the resin cap of the present invention.
[Explanation of symbols]
1: Top wall 2: Fitting part 5: Circumferential inner wall 6: Circumferential outer wall 10: Slit 11: Strong connecting part 12: Bridge 15: Outer band 16: Opening tab 20: Cutting surface 30: Opening 31 : Button member 32: Circumferential foot 35: Ceiling wall 36: Cylindrical wall 37: Flange wall 40: Recess for fitting 41: Small protrusion for degassing

Claims (4)

It consists of a top wall and a fitting part with a container mouth formed on the top wall periphery,
The fitting portion includes a circumferential inner wall that is connected to the top wall and is erected upward from the periphery of the top surface, and a circumferential outer wall that is located outside and spaced apart from the circumferential inner wall and includes an opening tab. And a connecting wall that connects the upper ends of the circumferential inner wall and the circumferential outer wall,
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,
In the top wall, an opening sealed with a button member is formed, and a portion of the top wall forming the opening descends downward to form a circumferential foot.
The button member includes a ceiling wall, a cylindrical wall hanging from the periphery of the ceiling wall, and a flange wall extending radially outward from the lower end of the cylindrical wall and having a tip portion extending upwardly. A recessed portion for fitting is formed by the lower portion of the cylindrical wall and the flange wall, and the button member seals the opening of the top surface wall by fitting the circumferential foot portion of the top wall into the recessed portion for fitting. And is fixed to
In the state of sealing the opening of the top wall, the ceiling wall of the button member is located at a position lower than the upper end of the circumferential inner wall,
At least one degassing small protrusion is formed on the outer surface of the cylindrical wall and at a position where the length from the lower end of the cylindrical wall is larger than the length of the circumferential leg portion of the top wall. By pressing the ceiling wall of the button member fixed so as to seal the opening of the face wall, the small vent for gas venting comes into contact with the inner surface of the circumferential foot portion to form a gas vent passage. Resin cap for gas beverage containers. A circumferential recess is formed on the inner surface of the circumferential foot, and a button member pushed in to form a gas vent passage is formed by engagement of the circumferential recess and the gas vent small protrusion. The resin cap for gas beverage containers according to claim 1, which is fixed in position. 3. The resin cap for a gas beverage container according to claim 1, wherein the center of the button member is located on a line connecting the center of the top surface and the center of the opening tab when viewed from the upper surface of the top surface wall. An outer band is connected to the circumferential outer wall via a breakable bridge and a non-breakable connecting portion, and the opening tab is provided at a position opposite to the connecting portion of the outer band. The gas drink according to any one of claims 1 to 3, wherein the outer band is formed by cutting after injection or compression molding, leaving the connecting portion and the bridge using a cutting blade. Resin cap for containers.

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