JP2003020056A - Cap seal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cap seal capable of reliably feeling that a mouth part of a vessel is unsealed for the first time only when the mouth part of the vessel is unsealed. SOLUTION: The cap seal 1 for sealing the mouth part of a plastic vessel 2 is formed of a long strip-like heat-shrinkable sheet 10 consisting of a three- layered sheet with a non-polystyrene-foam layer of 12 μm thick layered on face and back sides of a polystyrene foam layer of 101 μm thick. This cap seal 1 is heat-shrunk mainly in the circumferential direction, the tensile elongation in the vertical direction is suppressed to be 5%, and a perforation 1a extending in the circumferential direction is formed over the entire circumference between a screw cap 22 and a neck part 23. In the plastic vessel 2 with this cap seal 1 fitted thereto, the cap seal 1 is broken at the perforation 1a delightfully together with the sound of 'click' by gripping the screw cap 22 part and turning it in the opening direction, and the plastic vessel can be easily unsealed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap seal for sealing the mouth of a container, and more particularly to a cap seal which can be broken at perforations formed in the circumferential direction when the mouth of the container is opened.

[0002]

2. Description of the Related Art For example, a cap seal that seals the mouth of a container that is opened and closed by a screw cap is usually formed of a tubular heat-shrinkable film.
By heat-shrinking in a state in which the screw cap is fitted from the mouth to the neck so as to cover the screw cap, the screw cap and the neck are brought into close contact with each other.

In addition, there is a cap seal of this type in which a perforation extending in the circumferential direction is formed over the entire circumference between the screw cap and the neck portion, and in a container equipped with such a cap seal. By gripping the screw cap portion and turning it in the opening direction, the cap seal is broken at the perforated portion and can be easily opened.

[0004]

However, the cap seal as described above is generally formed by a thin film having an appropriate flexibility such as a polyester film or a polystyrene film such as a styrene / butadiene copolymer. In a container whose mouth is sealed with a cap seal formed of such a thin film having flexibility, even if the screw cap is gripped and rotated, the attached cap seal will be brilliantly broken at the perforations. However, there is a problem in that when the buyer of the product opens it, it is difficult to realize that the mouth of the container has been opened for the first time at that time.

Therefore, an object of the present invention is to provide a cap seal which can surely realize that the mouth of the container has been opened for the first time at the time of opening the mouth of the container.

[0006]

Means for Solving the Problems and Effects Thereof In order to solve the above problems, the invention according to claim 1 provides a perforation line extending in the circumferential direction, which is formed by a heat-shrinkable sheet which is heat-shrinkable in the circumferential direction. A cap seal having the above-mentioned heat-shrinkable sheet, wherein the heat-shrinkable sheet is formed of a single expanded polystyrene sheet or a multi-layer sheet including an expanded polystyrene layer.

As described above, since the cap seal is formed of the heat-shrinkable sheet using the expanded polystyrene sheet having a certain thickness and rigidity and having a low stickiness, the stretching direction of the heat-shrinkable sheet (heat Contraction direction)
It is easy to tear in the circumferential direction, so when opening the mouth of the container,
The cap seal is "Kashi"("Pashi","Pishi")
(Including etc.) It is brilliantly broken with perforations.

Therefore, the purchaser of the product can surely feel that the mouth of the container has been opened for the first time at that time by the feeling when the cap seal breaks at the perforation and the clicking sound. It is possible to get a sense of security about the contents.

Further, in the cap seal of the invention according to claim 2, which is formed of a heat-shrinkable sheet having a tensile elongation of 10% or less in the vertical direction, the cap seal itself has a vertical direction. Since it is difficult to stretch, when opening the container mouth, the upper and lower parts of the perforations in the cap seal that try to move relative to each other in the opposite direction are immediately broken at the perforations without moving relative to the circumferential direction. Become.

Therefore, as compared with a cap seal formed by a heat-shrinkable sheet having a tensile elongation in the vertical direction of more than 10%, the cap seal is more satisfactorily broken at the perforations, and a clicking sound is more likely to be obtained. There is an effect that the purchaser of the product can more certainly feel that the mouth of the container has been opened.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments will be described below with reference to the drawings. The cap seal 1 shown in FIG. 1 seals the mouth of a plastic container 2 for filling a sauce as shown in FIG. 3 (a), and the plastic container 2 is, as shown in FIG. It is provided with a screw cap 22 for opening and closing the spout portion 21 of the sauce, which is the content, and a neck portion 23 having substantially the same diameter as the screw cap 22.

As shown in FIG. 3B, the cap seal 1 is formed in a tubular shape having a diameter slightly larger than that of the neck portion 23 of the plastic container 2 so as to project above the screw cap 22. As shown in FIG. 4 (a), the screw cap 22 and the neck portion 23 of the plastic container 2 are fitted and inserted into the screw cap 22 and the neck portion 23. The mouth of the plastic container 2 is sealed by closely contacting with the peripheral portion of the upper surface of the screw cap 22.

This cap seal 1 has a structure shown in FIGS.
As shown in FIG. 4A, a perforation 1a extending in the circumferential direction is formed under the screw cap 22 that closes the spout 21 over the entire circumference. As shown in FIG. As for the plastic container 2 whose mouth is sealed by the seal 1, the cap seal 1 is broken at the perforation 1a by grasping the screw cap 22 and turning it in the opening direction, as shown in FIG. It can be opened.

This cap seal 1 is shown in FIG.
As shown in (b), a long strip-shaped heat composed of a three-layer sheet having a thickness of 125 μm in which non-foaming polystyrene layers 12 and 13 having a thickness of 12 μm are laminated on both front and back surfaces of a foamed polystyrene layer 11 having a thickness of 101 μm. The heat-shrinkable sheet 10 is formed of the shrinkable sheet 10, and has the physical properties shown in Table 1. The heat shrinkage rate shown in Table 1 is measured by immersing the test piece collected from the heat shrinkable sheet 10 in silicone oil at a predetermined temperature for 1 minute and then pulling it up.

[0015]

[Table 1]

As can be seen from Table 1, the heat-shrinkable sheet 10 is mainly designed to be heat-shrinked in the longitudinal direction (MD), and the heat-shrinkage rate in the longitudinal direction is 16 at 100 ° C.
% And 65% at 120 ° C., and the tensile elongation in the width direction (TD) is suppressed to 5%.

The expanded polystyrene layer 11 constituting the heat-shrinkable sheet 10 is a general-purpose polystyrene expanded with a foaming ratio of 2 to 10 times, preferably 2.5 to 7 times by various foaming agents, or , Polystyrene to butadiene, acrylonitrile, methacrylic acid, acrylic acid,
It is formed of a resin whose main component is a copolymer obtained by copolymerizing acrylic acid esters and the like, and contains a styrene component in an amount of 50% by weight or more, preferably 70% by weight or more. Further, the non-foamed polystyrene layers 12 and 13 are made of polystyrene, styrene-butadiene copolymer, styrene.
A styrene resin such as an acrylic acid copolymer, or a mixture of two or more of these styrene resins, or
It is made of a mixture of these and resins such as polyethylene and ethylene vinyl acetate copolymer, and contains 50% by weight or more of a styrene component.

The heat-shrinkable sheet 10 is manufactured by extruding the heat-shrinkable sheet 10 in a cylindrical shape from a circular die so that the non-foamed polystyrene layer 12 is formed on both sides of the expanded polystyrene layer 11, and stretched in the extrusion direction. Therefore, the heat shrinkability is mainly imparted in the longitudinal direction (MD) of the long sheet. In addition, this expanded polystyrene layer 11
Has a certain degree of thickness and rigidity, so the heat-shrinkable sheet 10 in which the expanded polystyrene layer 11 is laminated is
Once the sheet is bent, the folds remain and the appearance is deteriorated.

Therefore, like a normal cap seal or a tubular label formed of a non-foaming heat-shrinkable film that shrinks in the width direction (TD), it is folded in a tubular shape in advance. Since it cannot be supplied as a long strip-shaped sheet, it is wrapped around a mandrel or the like before being fitted into the mouth of the plastic container 2 and its both ends are pasted with a solvent or an adhesive, or heat-sealed. By doing so, it is formed into a tubular shape, which is pulled out from the mandrel and fitted into the mouth of the plastic container 2. The cap seal 1 manufactured in this manner mainly undergoes thermal contraction in the circumferential direction and has a tensile elongation of 5% in the vertical direction.
It will be suppressed.

As described above, the cap seal 1 is
Since the heat-shrinkable sheet 10 is formed by laminating the expanded polystyrene layer 11 having a certain thickness and rigidity and having a low stickiness, the heat-shrinkable sheet 10 is torn in the circumferential direction which is the stretching direction (heat shrinking direction). Easy and moreover, when opening the mouth of the plastic container 2, the cap seal 1 makes a perforated sound 1a with a "click" sound.
Is broken at.

Moreover, the heat-shrinkable sheet 10 has a small tensile elongation of 5% in the width direction (TD), and the cap seal 1 formed by the heat-shrinkable sheet 10 is difficult to extend in the vertical direction, so that the plastic container When opening the mouth of No. 2, cap seal 1 which tries to move relative to the opposite direction
The upper and lower parts of the perforation 1a in the above are immediately broken at the perforation 1a with almost no relative movement in the circumferential direction.

Therefore, the purchaser of the sauce feels and feels when the cap seal 1 is broken at the perforations 1a.
By the sound, it is possible to realize that the mouth of the plastic container 2 is opened for the first time at that time, and it is possible to obtain a sense of trust in the safety of the sauce as the content.

In the above-described embodiment, the heat-shrinkable sheet 10 is used as the expanded polystyrene layer 1 at the manufacturing stage.
Although the multilayer sheet in which the non-foamed polystyrene layers 12 and 13 are laminated on both front and back surfaces of 1 is used, the invention is not limited to this, and the foamed polystyrene sheet is laminated with the non-foamed polystyrene sheet manufactured individually. It may be a laminated sheet. It is also possible to use a heat-shrinkable sheet formed of a polystyrene foam sheet alone, but a multilayer sheet in which a non-foamed polystyrene layer is laminated on a foamed polystyrene layer, or a foamed polystyrene sheet is laminated with a non-foamed polystyrene sheet. By using the laminated sheet
The effect that the display of the product name and the like can be neatly obtained is obtained.

Further, in the above-described embodiment, the thickness 101
Although the multilayer sheet in which the expanded polystyrene layer 11 having a thickness of μm is laminated is used, the present invention is not limited to this, and is 100 to 500 μ depending on the container whose mouth is to be sealed.
A multi-layer sheet in which about m expanded polystyrene layers are laminated may be appropriately used.

In the above-described embodiment, the width direction (T
Although the heat-shrinkable sheet having a tensile elongation of 5% in D) is used, the heat-shrinkable sheet having a tensile elongation of 10% or less in the width direction (TD) is appropriately used. You can use it.

In the above-described embodiment, the plastic container 2 is fitted in the screw cap 22 and the neck 23 of the plastic container 2 in a tubular shape in advance, and heat-shrinked so that the plastic container 2 can be mounted. However, the present invention is not limited to this, and one end of the heat-shrinkable sheet may be connected to the neck portion 23 of the plastic container 2.
After applying the adhesive on the outer peripheral surface of the product, wrap it around the neck portion 23 so as to cover the screw cap 22, and heat-shrink the whole while the other end is applied to the one end with the adhesive. It is also possible to mount it on the plastic container 2.

In the above-described embodiment, the case where the plastic container 2 whose mouth is opened and closed by the screw cap 22 is sealed by the cap seal 1 has been described, but the present invention is not limited to this, and the cap seal of the present invention is not limited to this. Needless to say, can be used for sealing various containers equipped with a cap that opens and closes the mouth portion by rotating operation.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a cap seal according to the present invention.

FIG. 2 (a) is a plan view showing a heat-shrinkable sheet forming a cap seal of the above, and FIG. 2 (b) is XX of (a).
It is sectional drawing which followed the line.

FIG. 3 (a) is an exploded perspective view showing a plastic container to which the cap seal of the above is to be attached, and FIG. 3 (b) is a perspective view showing a state where a tubular cap seal is fitted into the plastic container of the same. .

FIG. 4 (a) is a perspective view showing a state in which the plastic container of the same is sealed by a cap seal of the same, and FIG.
FIG. 6 is a perspective view showing a state in which a plastic container closed by the cap seal above is opened.

[Explanation of symbols]

1 Cap seal 1a Perforation 2 plastic containers 10 Heat shrinkable sheet 11 Expanded polystyrene layer 12, 13 Non-expanded polystyrene layer 21 spout 22 screw cap 23 neck

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takako Nagaoka             5-3-18 Imazukita, Tsurumi-ku, Osaka             Company Fuji Seal F-term (reference) 3E084 AA04 AA12 AA24 AB01 BA03                       BA08 BA09 CA01 CC03 DA01                       DB03 DB12 DC03 FA09 FB01                       FD09 GA04 GB04 GB08 KA14

Claims (2)

[Claims] 1. A cap seal having a perforation extending in the circumferential direction, which is formed of a heat-shrinkable sheet that thermally shrinks in the circumferential direction, wherein the heat-shrinkable sheet comprises a single expanded polystyrene sheet or expanded polystyrene layer. A cap seal formed by a multi-layer sheet including. 2. The cap seal according to claim 1, wherein the heat-shrinkable sheet has a tensile elongation of 10% or less in a vertical direction.