JP2023102970A - Container cap structure and container using the same - Google Patents

Abstract

To provide a highly versatile container cap structure capable of venting gas generated in a container to the outside while having a simple structure, and capable of reliably preventing contents from leaking.SOLUTION: A container cap structure comprises: a cap body having a top wall and a peripheral wall hanging down from the top wall and formed to be attached in a capping manner on a neck of the container body; a top wall internally fitted to the cap body and sealing a neck opening of the container body; an inner plug having a seal cylinder hanging down from the top wall and formed to be inserted into the neck of the container body; and a sheet-shaped packing sandwiched between the top wall of the cap body and the top wall of the inner plug, wherein an opening is bored in the top wall of the inner plug.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a cap structure for a container, particularly a cap structure for a liquid container in which gas is generated spontaneously, and a container using the same.

2. Description of the Related Art Conventionally, there are agents that generate gas in agricultural chemicals, fertilizers, and the like, and such types of liquid agents are often filled in bottle containers, and so-called caps with internal plugs are often used as the lids of the containers. Here, the cap with an inner plug means a cap composed of an inner plug formed so as to be able to seal the opening of a container to enhance gas barrier properties, and a cap body containing the inner plug and formed so as to be attachable to the neck of the container.

As a problem with such a cap with an inner stopper, when gas is generated in the container during long-term storage of a drug that generates gas, the bottle expands due to the high gas barrier properties of the container, making it difficult to stand upright.

Therefore, as a countermeasure for degassing, a method such as making a hole in the inner plug or making a hole in the cap is conceivable, but the degassing effect is insufficient, and when the content is a liquid agent, there is a concern that the liquid may leak from such a hole. In particular, pesticides and fertilizers must be handled with care due to their properties, and from the viewpoint of safety, it is necessary to reliably prevent liquid leakage.

In this respect, Patent Documents 1 and 2 disclose a container cap provided with an air vent hole in the inner plug or the cap body and preventing liquid leakage by means of a breathable material, and Patent Document 3 discloses a cap provided with a valve cylinder that elastically deforms according to an increase in internal pressure.

However, these caps themselves require special processing, and have problems such as lack of versatility as caps and high manufacturing costs.

Utility Model Registration No. 2556499 Japanese Patent Laid-Open No. 5-270559 JP 2006-182425

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a general-purpose container cap structure which overcomes the drawbacks of conventional container cap structures and which is simple in structure but capable of venting gas generated in the container to the outside and reliably preventing the contents from leaking.

The present invention solves the above-mentioned problems, and is provided with a cap body having a top wall and a peripheral wall hanging from the top wall and formed so as to be able to be attached to the neck of a container body, a top wall that is housed inside the cap body and seals the neck opening of the container body, an inner plug that has a seal tube that hangs down from the top wall and is formed to be insertable into the neck of the container body, and a sheet-like packing that is sandwiched between the top wall of the cap and the top wall of the inner plug. The container cap structure has an opening formed in the ceiling wall.

Further, the present invention is a container cap structure, wherein the packing is made of a waterproof and moisture-permeable material.

Further, according to the present invention, there is provided a container cap structure, wherein the packing is formed with a hole.

Further, according to the present invention, there is provided a container cap structure, wherein the hole of the packing is formed at a position corresponding to the opening of the inner plug when the inner plug and the packing are set in the cap body.

Further, according to the present invention, there is provided a container cap structure, wherein the packing is provided with a plurality of holes over the entire surface of the packing.

Further, according to the present invention, there is provided a container cap structure, wherein the opening of the inner plug is formed in the center of the top wall.

Further, the present invention is a container comprising any one of the container caps described above.

According to the container cap structure of the present invention, it is possible to prevent deformation and rupture due to expansion of the container by allowing gas to escape to the outside through the opening formed in the top wall of the inner plug.

In addition, according to the container cap structure of the present invention, the packing sandwiched between the top wall of the cap body and the top wall of the inner plug can reliably prevent contents such as liquid from leaking to the outside.

Further, in the container cap structure of the present invention, when the packing is made of a waterproof and moisture-permeable material, the gas inside the container can be effectively released.

Furthermore, the container cap structure of the present invention in which the packing is provided with a hole can more effectively release the gas in the container, and furthermore, the production cost can be reduced by using the ready-made packing.

Sectional drawing of the cap structure for containers which concerns on this invention. FIG. 2 is a bottom view of the container cap structure according to the present invention; A plan view of one embodiment of the packing of the container cap structure according to the present invention. A plan view of one embodiment of the packing of the container cap structure according to the present invention.

Hereinafter, embodiments of the container cap structure of the present invention will be specifically described based on the drawings. In addition, this invention is not restricted at all by these embodiments.

FIG. 1 is a cross-sectional view showing a state in which a container cap structure according to the present invention is attached to a container body. As shown in the figure, the container cap structure of the present invention comprises a cap body 1 formed so as to be attached to the neck 41 of a container body 4, an inner plug 2 mounted inside the cap body 1, and a packing 3 sandwiched between the cap 1 body and the top wall of the inner plug 2. Each part will be described in detail below.

The cap body 1 includes a top wall 11 and a peripheral wall 12 hanging down from the peripheral edge of the top wall 11 , and a threaded portion 13 that can be screwed into a threaded portion 42 of the container 4 is formed on the inner peripheral surface of the peripheral wall 12 . Furthermore, above the threaded portion 13, a convex portion 14 is provided so as to protrude in the circumferential direction. Moreover, the upper part of the protrusion 14 is relatively recessed to form a recess 15 .

Furthermore, a ring portion 17 is connected via a bridge 16 to the lower end portion of the peripheral wall 12 of the cap body 1 . The ring part 17 is formed so as not to rotate in the circumferential direction beyond a certain range with respect to the neck part 41 of the container body 4, and with such a configuration, when the cap 1 is rotated at the time of opening, the bridge 16 breaks and the ring part 17 remains on the neck part 41. This makes it possible to confirm the virginity of opening the cap 1 .

The inner plug 2 mounted inside the cap main body 1 has a top wall 21 and a seal tube 22 provided so as to hang down from a portion of the top wall 21 that is set back inward from the outer edge of the top wall 21 . The top wall 21 is formed to cover the entire back surface of the top wall 11 of the cap body 1, and its outer edge 24 is inserted into the recess 15 of the inner peripheral surface of the cap 1, thereby locking the inner plug 2 to the cap body 1. In addition, the outer edge portion 24 is formed with an inclined surface 25 in which the upper surface side of the top wall 21 is inclined more inward so that it can be easily inserted into the concave portion 15 over the convex portion 14 . A design clearance may be provided between the outer edge 24 and the recess 15 on the inner peripheral surface, but the outer edge 24 may be in contact with the recess 15 due to manufacturing dimensional variations.

The seal tube 22 is a peripheral wall formed in a tubular shape, and is formed so as to be insertable into the opening of the neck portion 41 of the container body 4 . When the sealing cylinder 22 is inserted into the opening of the neck part 41, the outer peripheral surface of the sealing cylinder 22 and the inner peripheral surface of the neck part 41 are brought into close contact with each other and a sealed state is established, so that the contents in the container body 4 do not leak from between the sealing cylinder 22 and the neck part 41.

A circular opening 23 is formed in the top wall 21 of the inner plug 2 . In the present embodiment, one place is provided in the center of the top wall 21, but the number and position of the provision are not limited to this. However, providing it in the center as in this embodiment eliminates the need for alignment with the hole 31 of the packing 3 to be described later, which is preferable.

The opening size of the opening 23 can be appropriately determined according to the viscosity of the contents, the gas generation state, and the number of openings 23 provided, but the opening size is preferably 1 mm to 5 mm in diameter, and more preferably 2 mm to 4 mm.

A packing 3 is provided between the cap main body 1 and the inner plug 2 . The packing 3 is made of a sheet-like material, formed in substantially the same shape as the top wall 21 of the inner plug 2 , and covers the entire rear surface of the top wall 11 of the cap body 1 . The packing 3 need not always be sandwiched between the top wall 11 of the cap body 1 and the top wall 21 of the inner plug 2 in a state where the inner plug 2 and the packing 3 are set in the cap body 1, but at least when the cap body 1 is attached to the container body 4, it is sandwiched between the top wall 11 and the top wall 21.例文帳に追加Specifically, by capping the cap body 1 on the container body 4 with a predetermined torque, the inner plug 2 is pressed against the top wall 11 side of the cap body 1, and thereby the packing 3 of the top wall 21 of the inner plug 2 is held in a state of being appropriately pressed.

The packing 3 can use a known packing material. Specifically, a foamed polyethylene sheet, more preferably a foamed polyethylene sheet laminated with a polytetrafluoroethylene surface layer film having chemical resistance, can be suitably used.

Furthermore, as the packing 3 of the present invention, a sheet of waterproof and moisture-permeable material can be used. Specifically, a polyethylene sheet laminated with a fluorine film can be preferably used.

1 and 3, a hole 31 is bored in the center of the packing 3. As shown in FIG. Gas can escape to the outside through the gap between the packing 3 and the ceiling wall 21 even if the hole 31 is not provided.

The holes 31 of the packing 3 can be appropriately determined according to the viscosity of the contents, the state of gas generation, and the number of holes 31 to be provided, and are preferably large enough to allow gas such as gas to pass through and prevent the passage of liquids. Further, it is preferable to provide the hole 31 at a position corresponding to the opening 23 of the inner plug 2. However, by providing the hole 31 at the center of the packing 3 as shown in FIG. Furthermore, the holes 31 may be provided at a plurality of positions different from the opening 23, and may be provided over the entire surface of the packing 3 as shown in FIG.

EXAMPLES The present invention will be described in more detail below with reference to Examples and the like, but the present invention is not limited to these Examples and the like.
Example 1
Examples 1 to 4 and comparative products were prepared by the following method. These were evaluated for gas escape and liquid leakage according to the following criteria, and the results are shown in Table 1.

<Manufacturing method>
(1) Implementation product 1
A container cap consisting of a combination of a conventional cap body, a packing (without holes) made of high sheet (Mitsui Chemicals Tohcello, Inc.), and an inner plug having an opening with a diameter of 4 mm in the center of the top wall was used.
(2) Implementation product 2
A container cap consisting of a combination of a conventional cap body, a packing made of a high sheet (Mitsui Chemicals Tohcello, Inc.) with a hole of 0.5 mm in diameter in the center, and an inner plug with an opening of 4 mm in diameter in the center of the top wall was used.
(3) Product 3
A conventional cap body, a packing made of a high sheet (Mitsui Chemicals Tohcello, Inc.) having a total of 104 holes with a diameter of 0.5 mm with a pitch of 4.0 mm between adjacent holes on the entire surface, and an inner plug having an opening with a diameter of 4 mm in the center of the top wall.
(4) Implementation product 4
A container cap consisting of a combination of a conventional cap body, a packing (no hole) made from Gore Packaging Vent (Gore Japan Co., Ltd.), and an inner plug having an opening with a diameter of 4 mm in the center of the top wall was used.
(5) Comparative Product A container cap was used which was a combination of a conventional cap body and a conventional inner plug (no opening) and did not use packing.

<Evaluation method>
About 1 L of the actual liquid was placed in a 1 L wide-mouthed sealed bottle (multilayer), and the caps of Examples 1 to 4 and the comparative product were closed at 3 N/m.
(1) Gas release:
Test method: After upright storage at 54°C for 24 hours, gas release was confirmed. Specifically, the overall height of the bottle immediately after capping and after 24 hours of upright storage was measured with a height gauge, and rattling at the bottom of the upright container was evaluated.
(Evaluation) (Content)
〇: No backlash seen △: Slight backlash seen ×: Backlash seen

(2) Liquid leakage:
Test method: After the test in (1) above, the container body was placed on its side and liquid leakage was checked after 24 hours had passed.
(Evaluation) (Content)
〇: No liquid leakage is observed △: Very slight liquid leakage is observed ×: Liquid leakage is observed

As is clear from Table 1, all of the products of the present invention ensured sufficient prevention of liquid leakage, exhibited the effect of gas release, and hardly caused the problem of deformation of the container. On the other hand, the comparative product was found to have a problem in gas escape.

As described above, by providing the hole 31 in the packing 3, even if a ready-made packing that is not a special waterproof and moisture-permeable material is used, the gas can be reliably released, and the manufacturing cost can be suppressed.

In addition, the container cap structure according to the present invention has a very simple structure in which the opening 23 is formed in the inner plug 2, and the packing 3 is provided between the cap 1 and the inner plug 2. It is possible to achieve both reliable gas venting and liquid leakage prevention, and the versatility as a container cap is high, and a ready-made packing 3 can be used, so that the manufacturing cost can be suppressed.

1... Cap 2... Inner plug 3... Packing 4... Container main body 11... Top wall 12... Peripheral wall 13... Screw part 14... Protruding part 15...... Recessed part 16...... Bridge 17... Ring part 21...... Top wall 22... Seal tube 23 ... Opening 24 ... Outer edge 25 ... Inclined surface 31 ... Hole 41 ... Neck 42 ... Threaded part

Claims (7)

A container comprising: a cap body having a top wall and a peripheral wall hanging down from the top wall and formed to be able to be attached to the neck of a container body; a top wall that is housed in the cap body and seals the neck opening of the container body; an inner plug that hangs down from the top wall and has a seal cylinder formed that can be inserted into the neck of the container body; Cap structure for. 2. The container cap structure according to claim 1, wherein said packing is made of a waterproof and moisture-permeable material. 3. The container cap structure according to claim 1, wherein the packing has a hole. 4. The container cap structure according to claim 3, wherein the hole of the packing is formed at a position corresponding to the opening of the inner plug when the inner plug and the packing are set in the cap body. 4. The container cap structure according to claim 3, wherein the packing has a plurality of holes over the entire surface of the packing. 6. The container cap structure according to any one of claims 1 to 5, wherein the opening of the inner plug is formed in the center of the ceiling wall. A container comprising the container cap according to any one of claims 1 to 6.

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