JPH09175547A - Cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To open a cap with a weak force while keeping a high airtightness of a container opening, by extending a folded tongue flap to the top face of the opening at the cylindrical lower end of the inner cover in which a cylindrical part extending down to the outside of the container opening is connected to a packing and providing a protrusion raising the packing with the uncapping at the external cover. SOLUTION: A pilferproof cap is constituted of a synthetic resin external cover 5 to which a pilferproof band 4 is connected to the cover body 2 screws in the male screw part (a) of the container opening 1 through a pluraliy of fragile bridges 3 and a synthetic resin inner cover 8 in which a cylindrical part 7 extending dot to the outside direction of the opening 1 is connected to the sealing packing 6 for the container opening. A tongue flap folding to the top face 1a side of the container opening 1 is extended to the lower end of the cylindrical part 7. A fixing member 11 fixing to an annular heave 10 of the lower part of the male screw (a) from the lower side is connected to the pilferproof band 4 and a protrusion 12 raising the packing 6 after the bridge 3 has been cut with uncapping of the cover body 2 is connected to the cover body 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap that is screwed onto a male screw portion of a container mouth such as a PET bottle or a glass bottle for drinks.

[0002]

2. Description of the Related Art As a cap pursuing the airtightness of a container mouth, for example, as shown in Japanese Patent Publication No. 4-506649, an outer lid screwed to a male screw portion of the container mouth is HD.
Molded with a synthetic resin material such as PE (high-density polyethylene), LDPE (low-density polyethylene), PP (polypropylene), etc., the cylindrical part is hung on the top plate of this outer lid in the state of hanging outward from the container mouth. There is a continuous type in which a bent tongue extending toward the top of the mouth is provided at the lower end of the tubular portion.

With such a cap, the bent tongue at the lower end of the tubular portion is pushed into an r-shape by the outer edge of the container mouth when the outer lid is screwed onto the container mouth. It is said that the pressed and bent tongue piece and the packing are sandwiched between the top plate of the outer lid and the top surface of the container mouth, whereby the airtightness of the container mouth is kept high. Was there.

Further, in the case of a container containing a liquid having an internal pressure such as a carbonated drink, under the high temperature environment of, for example, 50 ° C. or higher, such as the case where the container is transported by truck in the summer, the top of the outer lid is exposed. A so-called doming phenomenon in which the central part of the plate swells in a dome shape may occur, but when the central part of the top plate swells in a dome shape in this way, internal pressure is applied to the gap between the top plate and the bent tongue. Therefore, it is said that the bent tongue is pressed against the outer surface of the container opening to maintain the airtightness of the container opening.

[0005]

However, in order to deal with the so-called doming phenomenon, it is required that the outer lid has a high rigidity. Contrary to this, the bent tongue is required to be airtight. However, in the above-mentioned technology, HDPE, LDPE, PP, etc. are selected as the synthetic resin material, and the tubular portion and the bent tongue are integrally formed on the outer lid, though a flexible material is required. Because it is molded,
For the outer lid, if a material with high rigidity is selected, it is suitable for dealing with the doming phenomenon, but since the above synthetic resin material lacks flexibility, it is difficult to obtain high airtightness with a bent tongue piece. Met.

From the standpoint of maintaining high airtightness,
It is necessary to firmly screw the outer lid onto the container mouth, but this causes the pressing surface pressure of the bent tongue to the container mouth to become extremely high, which overcomes the large frictional resistance and opens the outer lid. There was a problem that the opening torque was abnormally large when plugging.

Further, since the bending tongue piece is inferior in flexibility, the bending tongue piece becomes less familiar with the outer surface of the mouth due to internal pressure when the doming phenomenon occurs, and the air tightness of the container mouth is increased as expected. It was not something that could be kept high. On the other hand, when a material having low rigidity such as LDPE is selected as the material of the outer lid, there is a problem that a doming phenomenon occurs and airtight leakage occurs. Such a problem,
It occurs regardless of what is called a screw cap or a pill fur proof cap.

[0008]

In order to solve the above-mentioned problems, the present invention comprises a bent tongue separately from the outer lid, and maintains the airtightness of the container mouth portion by the bent tongue high. Although it can be done, the container mouth can be opened easily with a light force.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION That is, the cap according to the present invention is
An outer lid made of synthetic resin that is screwed to the male screw part of the container mouth,
It consists of a synthetic resin inner lid in which a cylindrical part that hangs outward from the mouth is connected to a packing for sealing the container mouth, and the lower end of the tubular part is bent toward the top of the mouth. The tongue piece is extended, while the outer lid is provided with a protrusion for lifting the packing when the outer lid is opened.

If the cap is constructed in a so-called pill fur proof type, the outer lid is attached to the lid body by means of a lid body screwed to the male screw portion of the container mouth and a plurality of brittle bridges. With a pilfer proof band that is lined up,
The pilfer proof band is continuously connected to the pilfer proof band, and is configured to engage with an annular raised portion below the male screw portion from below, and the protrusion is provided with a packing after cutting the bridge accompanying opening of the lid. It may be provided at a position for lifting.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a sectional view of a cap made of a so-called pill fur proof type synthetic resin according to the present invention before the cap is closed, and FIG. 2 shows a sectional view of the pill fur proof cap in a closed state.

This pill fur proof cap is made of a synthetic resin in which a pill fur proof band 4 is connected to a lid 2 screwed to a male screw portion a of a container mouth 1 through a plurality of fragile bridges 3. It comprises an outer lid 5 and a synthetic resin inner lid 8 in which a container 6 for sealing the container opening is provided with a cylindrical part 7 that hangs outward from the container opening 1. At the lower end of the tongue piece 9 that is bent toward the top surface 1a side of the container mouth portion 1
Has been extended.

The pill fur proof band 4
In addition, a locking member 11 that locks from below is continuously provided to the annular raised portion 10 below the male screw portion a, and the lid body 2 is provided with a packing after cutting the bridge 3 accompanying opening of the lid body 2. A protrusion 12 for lifting 6 is provided in series.

The lid 2 is formed by suspending a peripheral wall 2b around the peripheral edge of a circular top plate 2a in plan view, and is screwed to the male screw portion a on the inner peripheral surface of the peripheral wall 2b. The female screw part b and the protrusion 12 are provided. The protrusion 12 may be provided separately from the female screw portion b, but in this embodiment, the protrusion 12 is integrally provided on the upper portion of the female screw portion b.

A plurality of locking members 11 are provided at the lower end of the pill fur proof band 4 so as to have appropriate elasticity and are folded back inward and spaced apart from each other. In the middle of mounting 5, the locking member 1
1 is elastically deformed toward the peripheral wall 2b side of the lid body 2 and elastically returns to the initial posture when the mounting is completed, and its upper end is locked to the annular ridge 10 from below, thereby 5 is mechanically integrated with the container mouth 1. The locking member 1
The number 1 is not limited to the above-mentioned shape, and may be a plurality of continuous V-shaped locking pieces as shown in Japanese Patent Application Laid-Open No. 7-41023 or other shapes.

PP or HDPE is selected as the synthetic resin material for molding the outer lid 5, and PE (polyethylene) or EV is used as the synthetic resin material for molding the inner lid 8.
A (ethylene vinyl acetate) etc. is selected,
As the synthetic resin material for molding the outer lid, PP is suitable for increasing rigidity, and as the synthetic resin material for molding the inner lid, PE is suitable for obtaining flexibility.

In the above structure, first the inner lid 8 is replaced with the outer lid 5.
After being fitted and held inside, the outer lid 5 is attached to the container mouth portion 1.
When it is screwed on, the tongue piece 9 bends in accordance with the screwing and is pressed and bent into an r shape by the outer edge c of the container mouth portion 1, and the end side of this tongue piece 9 and the packing 6 are covered with the outer lid. Board 2a
It is sandwiched between the top surface 1a of the mouth and the top surface of the mouth portion 1a, and the packing 6
By molding a cylindrical portion 7 and a bent tongue piece 9, that is, an inner lid 8 separate from the outer lid 5 by selecting a synthetic resin material having excellent flexibility, The airtightness can be kept high.

Further, as exaggeratedly shown in FIG. 3, even if a so-called doming phenomenon occurs in which the central portions of the packing 6 of the inner lid 8 and the top plate 2a of the outer lid 5 swell in a dome shape, the packing 6 and Internal pressure is applied to the gap between the tubular portion 7 and the bent tongue piece 9, and the flexible bent tongue piece 9 is pressed against the outer surface of the container mouth portion 1 so that the container mouth portion 1
The airtightness of is maintained high.

At the time of opening the stopper, the lower end of the pill fur proof band 4 is provided with an annular protrusion 10 via a locking member 11.
The bridge 3 is cut as the lid 2 is rotated in the opening direction, and the inner lid 8 is lifted by the protrusion 12 after the cutting.

Since the inner lid 8 in which the packing 6 is bent and the tongue piece 9 is connected to the packing 6 via the tubular portion 7 is formed separately from the outer lid 5, the bent tongue with respect to the container mouth portion 1 is formed. No matter how high the pressing surface pressure of the piece 9, that is, no matter how large the frictional resistance between the container mouth portion 1 and the bent tongue piece 9, the surface pressure of the outer lid 5 against the inner lid 8 is small. Since the frictional resistance between them is extremely small, the lid body 2 can be lightly and easily opened with a small opening torque.

In the above embodiment, the pill fur proof type cap is shown. However, the present invention can be suitably implemented even if a normal screw type cap having no pill fur proof band 4 is used. Needless to say.

[0022]

As described above, according to the cap of the present invention, the inner lid in which the bent tongue piece is connected to the packing through the tubular portion is formed separately from the outer lid. Thus, these outer lid and inner lid can be formed by selecting a synthetic resin material having characteristics required for each, of course, it is possible to keep the airtightness of the container mouth portion by the bent tongue high. The doming phenomenon can be suitably dealt with, and the outer lid can be easily and easily opened with a small opening torque.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a pill fur proof cap showing a state before a cap is closed.

FIG. 2 is a configuration diagram of the pill fur proof cap in a closed state.

FIG. 3 is an explanatory diagram exaggeratingly illustrating a working state of internal pressure when a doming phenomenon occurs.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Container mouth part, 1a ... Top part of mouth part, 2 ... Lid body, 3 ... Bridge, 4 ... Pilfer proof band, 5 ... Outer lid, 6 ... Packing, 7 ... Cylindrical part, 8 ... Inner lid, 9 … Bent tongue,
Reference numeral 10 ... Annular raised portion, 11 ... Locking member, 12 ... Protrusion, a
… Male thread.

Claims (2)

[Claims] 1. A synthetic resin in which a synthetic resin outer lid screwed to a male screw portion of a container mouth portion and a cylindrical portion hanging outward from the container mouth portion are connected to a packing for sealing the container mouth portion. And a bending tongue extending toward the top of the mouth at the lower end of the tubular portion, while the outer lid is provided with packing as the outer lid is opened. A cap characterized by being provided with a protrusion for lifting. 2. The outer lid, a lid body screwed to a male screw portion of a container mouth, a pill fur proof band connected to the lid body through a plurality of fragile bridges, and a pilfer. A position where the packing member is connected to the proof band and is locked to the annular raised portion below the male screw portion from below, and the protrusion is positioned to lift the packing after cutting the bridge accompanying opening of the lid. The cap according to claim 1, wherein the cap is provided.