JP2001063750A - Cap with high sealability - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cap which can be sealed or unsealed by a small force, and at the same time, wherein a seal release angle is large, and the sealed state can be kept even when the cap or the container mouth section is deformed. SOLUTION: In this screw type cap 1, along a corner section between the cap top surface 3 and the cap side surface 4, a packing 6 of a rubber based resin, which is rich in elasticity, particularly, a three dimensional polymer (EPDM) rubber of ethylene, propylene and diene, is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a soft drink, soy sauce,
The present invention relates to a screw cap of a plastic or glass bottle for filling liquids such as alcoholic beverages, cosmetics, and pharmaceuticals.

[0002]

2. Description of the Related Art Screw-on caps are used as caps for various containers, since once opened, they can be sealed by screwing into the original container mouth. The cap is
It comes into contact with the mouth of the container due to the stress at the time of sealing, preventing its contents from leaking due to its deformation, preventing leakage of carbon dioxide gas in carbonated beverages, preventing escape of aroma in cosmetics, and contamination and contents from outside. It has a function to prevent deterioration of things. For this reason, when handling the logistics process, it is necessary to ensure the sealing performance even when the cap and the mouth are deformed due to vibration, temperature, impact, etc., and also to consider the openability, slipperiness, etc. .

Conventionally, as such a cap, a metal such as tinplate, steel, aluminum or the like, or a plastic such as polyethylene resin or polypropylene resin is used as a shell, and a polyethylene resin or a soft polyvinyl chloride resin is used for packing. A liner (packing) -less type, which is a single body of a polyethylene resin or a polypropylene resin and also serves as a shell and a packing, is widely used.

However, when the cap is sealed with these caps, the cap is screwed and the packing is extended when the cylinder at the mouth of the container comes into contact with the packing. The polyethylene resin and the polyolefin resin used in the packing require a large torque to completely close the plug because they have rigidity and large stress against elongation. In addition, a large torque is required for opening for the same reason.

[0005] In addition, due to the rigidity, when the cap or the container mouth is deformed due to impact or temperature change,
It is difficult to maintain a sealed state. Furthermore, the seal release angle (the rotation angle from the hermetically sealed state until the hermetically sealed state is released) is small, and there is a possibility that the hermetically sealed state may be lost due to vibration during transportation or the like.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and can be sealed and opened with a small force, and has a large seal release angle.
An object of the present invention is to provide a cap that can maintain a sealed state even by deformation of the cap and the container mouth.

[0007]

According to a first aspect of the present invention, there is provided a screw-type cap, comprising a rubber having a high elasticity along a corner portion between a cap top surface and a cap side surface. A high-adhesion cap characterized by providing a packing of a base resin.

Further, according to the invention of claim 2, the rubber resin is a three-dimensional polymer of ethylene / propylene / diene (E).
The high-adhesion cap according to claim 1, wherein the cap is a PDM) rubber.

According to a third aspect of the present invention, at the time of sealing, the packing is provided so that the entire upper portion of the cylindrical wall of the container mouth and the side surface of the cylindrical wall are 1.5 mm or more in close contact with the packing. The high-adhesion cap according to claim 1 or 2, wherein

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the drawings. FIG. 1 shows that the screw-on cap (1) has a container opening (2).
FIG. 4 is a cross-sectional view showing a state where the device is screwed into the container and sealed. When the cap provided with the packing (6) inside the top (3) and side (4) corners of the cap (1) is screwed in, the cylinder (5) at the mouth of the container enters the elastic packing and adheres tightly. And can be completely sealed.

[0011] The material of the packing is elastic butadiene rubber (BR), isoprene rubber (IR), chloroprene rubber (CR), styrene-butadiene rubber (SB).
R), ethylene propylene rubber (EPR), and three-dimensional polymer rubber (EPDM) containing a small amount of a diene such as ethylidene or norbornene in ethylene propylene. Among them, EPD can be used as shown in the following table.
Since M has excellent heat resistance, it is suitable for those which are heat-sterilized.

[0012]

[Table 1]

When the cap is screwed tightly,
Even when the cylinder (5) at the container opening hits the packing (6), the packing has elasticity, so that the cylinder (5) can be further screwed into the packing so that the cylinder (5) is engaged.
In this state, the sealing can be completely maintained. In a state where the cylinder has been inserted into the packing, the upper part of the cylinder wall at the container mouth is the entire surface, and the side surface of the cylinder wall is at least 1.5 mm so as to be in close contact with the packing to complete the sealing and the cap is closed. Even if it is slightly loosened, the sealed state can be maintained. That is, it can be said that the seal release angle is large.

[0014] The packing is provided by converting a rubber into a plastic sol, a latex, filling a liquid substance into a pressurizing unit, applying a ring from the nozzle under a constant pressure along the outer peripheral portion of the inner surface of the cap, baking and drying. To provide packing. Alternatively, after a sheet formed into a sheet having a certain thickness is punched, the sheet is provided by thermocompression bonding to a cap.

FIG. 2 is a view showing a sealed state when the cylinder and the cap are deformed by physical action such as impact or heat. For example, (a) shows the case where the cylinder is deformed while tilting inward.
(B) indicates that the cylinder is deformed while tilting outward, and (c) indicates that the cap is deformed in any case when the cylinder comes into close contact with the packing and is plugged.

As described above, even if the cap or the mouth is slightly deformed, the cap or the mouth can be sealed, so that the allowable range of variation in manufacturing the cap and the container becomes large.

[0017]

According to the present invention, a rubber-based resin packing having high elasticity is provided along the corner between the top surface of the cap and the side surface of the cap, so that the cap can be sealed and opened with a small force, the seal release angle is large, and the cap is provided. It is possible to maintain the sealed state even by deformation of the container opening. Also,
Even if it is slightly deformed, it can be plugged tightly, so that there is also an effect that the allowable range of variation in manufacturing the cap and the container is increased.

Further, by using EPDM for packing, a cap having heat resistance can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a state at the time of sealing.

FIG. 2 is a cross-sectional view illustrating a state at the time of sealing when a cap and a mouth are deformed. (A) is a cross-sectional view for explaining the case where the tube of the container mouth is deformed inward, (b) is the case where the tube of the container mouth is deformed outward, and (c) is a cross-sectional view for explaining the case where the cap is deformed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cap 2 ... Container mouth part 3 ... Cap top surface 4 ... Cap side surface 5 ... Cylinder 6 ... Packing

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kiyoshi Wada 1-5-1, Taito, Taito-ku, Tokyo Inside Toppan Printing Co., Ltd. (72) Inventor Minoru Kitazawa 1-1-5-1 Taito, Taito-ku, Tokyo Toppan F-term (reference) in Printing Co., Ltd.

Claims (3)

[Claims] 1. A high-adhesion cap, wherein a rubber-based resin packing having high elasticity is provided along a corner between a cap top surface and a cap side surface. 2. The high adhesion cap according to claim 1, wherein the rubber-based resin is a three-dimensional polymer (EPDM) rubber of ethylene / propylene / diene. 3. The packing according to claim 1, wherein at the time of sealing, the packing is provided so that the entire upper portion of the cylindrical wall of the container mouth and the side surface of the cylindrical wall are in close contact with the packing by 1.5 mm or more. The high adhesion cap according to claim 2.