JP3485563B1 - Resin lid for internal pressure adjustment of packaging containers - Google Patents

Abstract

An object of the present invention is to provide a resin lid for adjusting the internal pressure of a packaging container, which has a simple structure and a low production cost. SOLUTION: In a resin lid for adjusting internal pressure of a packaging container,
A resin base member having a function as a valve seat, which is pressure-bonded to a can opening fixed to an opening of a top plate of the packaging container, and a resin cap having a function as a valve placed on the resin base member; The resin base member has a central hole in the center of the bottom wall, inner and outer annular projections serving as valve seats on the inner bottom wall, a side wall rising from the outer periphery of the bottom wall, and the side wall. A side wall annular projection formed inside of the side wall portion, a horizontal flange portion extending horizontally outward from the upper end of the side wall portion, and an upper annular projection extending upward from above the horizontal flange portion, and the resin cap has a lower end. A hollow cylindrical portion that is open and closed at the upper end, a thin bottom wall portion extending horizontally from an outer side wall portion of the hollow cylindrical portion, a plurality of gas vent holes formed in the thin bottom wall portion, and the thin bottom wall Having a seal portion formed on the outer periphery of the portion, A lower portion of the hollow cylindrical portion of the resin cap is positioned in a central hole of the base member, and a plurality of gas vent holes of the thin bottom wall portion are positioned between the inner and outer annular projections. It is characterized in that it is engaged with the annular projection to form a passage communicating between the inside of the packaging container and an air vent hole located between the inner and outer annular projections of the resin base member due to an increase in the internal pressure of the packaging container.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin lid for adjusting an internal pressure used for a packaging container for storing a volatile liquid, a fermentable liquid and the like.

[0002]

2. Description of the Related Art Conventionally, in a packaging container containing a volatile liquid or a fermentable liquid, a small hole is formed in a lid of the packaging container,
A valve biased to a closed state by a biasing means such as a spring is provided in the small hole, and when the internal pressure of the packaging container rises, the valve opens against the biasing means to open the gas inside the packaging container to the outside. It is known that the internal pressure in the packaging container is maintained below a predetermined pressure by discharging the internal pressure to the inside. Also, the actual Kaihei 6-251
In JP-A-52-52, a linear notch is formed on the upper surface of a resin lid of a packaging container, and when the internal pressure of the packaging container rises, the gas in the packaging container opens the notch and is discharged to the outside. Things are disclosed.

[0003]

[Patent Document 1] Japanese Utility Model Laid-Open No. 6-25152

[0004]

However, in the internal pressure adjusting lid in which the lid is provided with the valve biased in the closing direction, the small hole is blocked by foreign matter or the coagulation of the content liquid, and the internal pressure adjusting function is sufficiently exerted. There is a problem that it is not carried out, a biasing means such as a spring is required, the structure is complicated, and the manufacturing cost is high. Further, in the internal pressure adjusting lid in which a linear cut is formed on the upper surface of the resin lid, there is a problem that when the packaging container is laid down, the sealing function is not sufficient and the content liquid leaks from the cut portion. It was a thing.

The present invention provides a resin lid for adjusting the internal pressure of a packaging container which solves the above-mentioned problems of the prior art, has a simple structure, is inexpensive in manufacturing cost, and does not leak the internal solution even when it is laid on its side. With the goal.

[0006]

In order to solve the above-mentioned problems, the present invention provides a resin lid for adjusting an internal pressure of a packaging container, which is crimped to a can opening fixed to an opening of a top plate of the packaging container. A resin base member having a function of a valve seat, and a resin cap having a function as a valve placed on the resin base member, and the resin base member is centered at the center of the bottom wall portion. A hole, inner and outer annular projections that serve as valve seats on the inner bottom wall surface, a side wall portion that rises from the outer periphery of the bottom wall portion, a side wall annular projection formed inside the side wall portion, and a horizontal surface from the upper end of the side wall portion. Has a horizontal flange portion that extends outwardly, and an upper annular protrusion that extends upward from above the horizontal flange portion, and the resin cap has a hollow cylindrical portion whose lower end is open and whose upper end is closed, and the outside of the hollow cylindrical portion. A thin bottom wall extending horizontally from the side wall And a plurality of gas vent holes formed in the thin bottom wall portion and an outer peripheral seal portion formed on the outer periphery of the thin bottom wall portion, wherein the resin cap is provided in the central hole of the resin base member. Position the lower part of the hollow cylinder,
A plurality of gas vent holes in the thin bottom wall portion are located between the inner and outer annular protrusions, the seal portion is engaged with the side wall annular protrusion, and the inner and outer annular protrusions of the resin base member are increased by increasing the internal pressure of the packaging container. It is characterized in that a passage communicating between the air vent hole and the inside of the packaging container is formed.

According to a second aspect of the present invention, in the resin lid for adjusting the internal pressure of the packaging container according to the first aspect of the present invention, a notch is formed in the horizontal flange portion of the resin base member to leave a plurality of connecting portions for adjusting the internal pressure. It is characterized in that it is a pull top for removing the resin lid from the can mouth.

The third invention is characterized in that in the resin lid for adjusting the internal pressure of the packaging container of the first or second invention, a cap with elastic claws is attached on the resin lid for adjusting the internal pressure of the packaging container.

[0009]

The resin lid for adjusting the internal pressure of the packaging container according to the present invention is crimped to the can opening fixed to the opening of the top plate of the packaging container, and has a resin base member having a valve seat function, and the resin base member. It has a double structure consisting of a resin cap that functions as a valve placed on top, has an excellent sealing function, and the internal solution does not leak even when the packaging container is laid down. In addition, the internal pressure adjusting function is provided between the inner and outer annular projections formed on the inner bottom wall surface of the resin base member and the plurality of gas vent holes formed on the thin bottom wall portion of the resin cap between the inner and outer ring-shaped projections. Since the valve mechanism is configured by positioning it, it is possible to provide a resin lid having a reliable internal pressure adjusting function with a simple configuration. A resin lid from the can mouth of the packaging container is constructed by forming a notch leaving a plurality of connecting parts in the horizontal flange portion of the resin base member and forming a pull top for removing the resin lid for internal pressure adjustment from the can mouth. Can be easily removed. Further, the structure in which the cap with the elastic claw is attached on the resin lid for adjusting the internal pressure of the packaging container enables the can mouth of the packaging container to be securely and safely closed while exhibiting the internal pressure adjusting function of the resin lid for adjusting the internal pressure.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a usage state of a resin lid for adjusting an internal pressure of a packaging container, FIG. 2 is a plan view, and FIG.
FIG.

Resin lid 1 for adjusting the internal pressure of the packaging container of the present invention
Is a resin-made base member 4 which is press-fitted to an opening formed in the top plate 2 of the packaging container and which is press-fitted to a can mouth 3 which is fixed by means such as caulking, and a resin-made base member 4 which is fitted on the resin-made base member 4. It is composed of the cap 5. The resin base member 4 is
An opening 7 is formed in the center of the bottom wall portion 6, and an inner annular protrusion 8 and an outer annular protrusion 9 are formed on the upper surface of the bottom wall portion 6. The side wall portion 10 is formed on the outer periphery of the bottom wall portion 6, and the side wall annular protrusion 11 is formed at a predetermined height position inside the side wall portion 10.
A horizontal flange portion 12 that horizontally extends outward from the upper end of the side wall portion 10.
Is formed, and an upper annular projection 13 in which vertical grooves are formed is formed from the horizontal flange portion 12 at a predetermined interval. The horizontal collar 12 has
The outer peripheral portion of the side wall portion 10 of the resin base member 4 forming the cut portion 14 leaving a plurality of connecting portions is pressure-bonded to the can mouth 3 of the packaging container to the position of the horizontal flange portion 12.

The resin cap 5 fitted on the resin base member 4 has a hollow bottom wall portion 15 in which a hollow cylindrical portion 16 having an open lower end and an upper end is formed in the central portion of the thin bottom wall portion 15. A plurality of air vent holes 17 are formed in the portion 15 so as to be located between the inner and outer annular projections 8 and 9 formed on the bottom wall portion 6 of the resin base member 4. A tip seal portion 18 is formed on the outer periphery of the thin bottom wall portion 15. An enlarged portion 19 having a diameter slightly larger than the opening 7 of the resin base member 4 is formed on the outer periphery of the lower end of the hollow cylindrical portion 16. The enlarged portion 19 at the lower end of the hollow cylindrical portion 16 of the resin cap 5 is pushed into the opening 7 of the resin base member 4, and the bottom surface of the thin bottom wall 15 and the inner and outer annular projections 8 and 9 of the resin base member 4 are inserted. The resin base member 4 and the resin cap 5 are sealed by engaging with each other and engaging the seal portion 18 on the outer periphery of the thin bottom wall portion 15 with the side wall annular projection 11 of the resin base member 4. The cap 20 with the elastic claw is attached thereon. The notch 14 formed on the horizontal flange 12 of the resin base member 4 functions as a pull-top for removing the resin lid 1 for internal pressure adjustment from the can mouth 3.

Resin lid 1 for adjusting the internal pressure of the packaging container of the present invention
The operating state of will be described. The resin lid 1 for internal pressure adjustment, which comprises a resin base member 4 and a resin cap 5 that are crimped to the canister 3 of the packaging container, includes an inner and outer annular projections 8 and 9 of the resin base member 4 and a resin cap 5. The seal by engaging with the bottom surface of the thin bottom wall portion 15 and the seal by engaging with the side wall annular projection 11 of the resin base member 4 and the outer peripheral seal portion 18 of the resin cap 5 allow the inside and outside of the packaging container to be separated from each other. It is sealed. Gas is generated from the volatile liquid or the fermentable liquid in the packaging container to increase the internal pressure in the packaging container. The rise of the internal pressure in the packaging container acts on the hollow cylindrical portion 16 of the resin cap 5 to push the thin bottom wall portion 15 slightly upward, and the thin bottom wall portion 1
5, the space between the bottom surface of the resin base member 4 and the inner and outer annular projections of the resin base member 4,
9, the passage between the opening 7 and the hollow cylindrical portion 16 and the passage between the bottom wall portion 6 and the thin bottom wall portion 15 are opened, and the gas in the packaging container is evacuated. It is discharged from the opening 17 and the internal pressure in the packaging container is kept below a predetermined level.

[0014]

The resin lid for adjusting the internal pressure of the packaging container of the present invention is crimped to the can opening fixed to the opening of the top plate of the packaging container, and has a resin base member having a valve seat function, and the resin lid. It has a double structure consisting of a resin cap that functions as a valve placed on the base member, has an excellent sealing function, and the internal solution does not leak even if the packaging container is laid sideways. . In addition, the internal pressure adjusting function is provided between the inner and outer annular projections formed on the inner bottom wall surface of the resin base member and the plurality of gas vent holes formed on the thin bottom wall portion of the resin cap between the inner and outer ring-shaped projections. Since the valve mechanism is configured by positioning it, it is possible to provide a resin lid having a reliable internal pressure adjusting function with a simple configuration. A resin lid from the can mouth of the packaging container is constructed by forming a notch leaving a plurality of connecting parts in the horizontal flange portion of the resin base member and forming a pull top for removing the resin lid for internal pressure adjustment from the can mouth. Can be easily removed. Further, the structure in which the cap with the elastic claw is attached on the resin lid for adjusting the internal pressure of the packaging container enables the can mouth of the packaging container to be securely and safely closed while exhibiting the internal pressure adjusting function of the resin lid for adjusting the internal pressure.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing an embodiment of the present invention.

FIG. 3 is a diagram showing an embodiment of the present invention.

[Explanation of symbols]

1: Resin lid for adjusting internal pressure of packaging container 2: Top plate of packaging container 3: Can mouth 4: Resin base member 5: Resin cap 6: Bottom wall 7: opening 8: Inner annular protrusion 9: Outer annular protrusion 10: Side wall 11: Side wall annular protrusion 12: Horizontal collar part 13: Upper annular protrusion 14: Notch 15: Thin bottom wall 16: Hollow cylindrical part 17: Air vent hole 18: Peripheral seal part 19: Enormous section 20: Cap with elastic claw

Claims (3)

(57) [Claims] 1. A resin base member having a function of a valve seat, which is crimped to a can mouth fixed to an opening of a top plate of a packaging container,
The resin base member is mounted on the resin base member and has a function as a valve. The resin base member has a central hole in the center of the bottom wall portion and an inner bottom wall surface that serves as a valve seat. And an outer annular protrusion, a side wall portion rising from the outer periphery of the bottom wall portion, a side wall annular protrusion formed inside the side wall portion, a horizontal flange portion that horizontally extends outward from an upper end of the side wall portion, and the horizontal flange. Having a top annular projection extending upward from above, the resin cap has a hollow cylindrical portion whose lower end is open and whose upper end is closed; and a thin bottom wall portion which horizontally extends from an outer side wall portion of the hollow cylindrical portion. A plurality of gas vent holes formed in the thin bottom wall portion and an outer peripheral seal portion formed on the outer periphery of the thin bottom wall portion, and a hollow of the resin cap in a central hole of the resin base member. Position the lower part of the cylinder to A plurality of gas vent holes in the wall portion are located between the inner and outer annular projections, the outer peripheral seal portion is engaged with the side wall annular projection, and is located between the inner and outer projections of the resin base member due to an increase in internal pressure of the packaging container. A resin lid for adjusting the internal pressure of a packaging container, characterized in that a passage communicating between the air vent hole and the inside of the packaging container is formed. 2. A pull-top for removing the internal pressure adjusting resin lid from the can mouth by forming a notch in the horizontal flange portion of the resin base member leaving a plurality of connecting portions. 1. A resin lid for adjusting the internal pressure of the packaging container according to 1. 3. The resin lid for internal pressure adjustment of a packaging container according to claim 1, wherein a cap with elastic claws is attached on the resin lid for internal pressure adjustment of the packaging container.