JP2008001371A - Tube container having check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tube container having a check valve capable of preventing reverse flow of air from occurring from a neck part after extruding a content, and easily stopping the adequate amount of use of the content at the most distal end point of the neck part. <P>SOLUTION: In a laminate tube container in which a barrel part is formed of a cylindrical body with a multi-layered laminate film being heat-sealed in a cylindrical shape, and a shoulder part and a neck part molded of a synthetic resin on one opening part of the cylindrical body, an innermost layer of the barrel part, the shoulder part and the neck part are formed of a thermoplastic resin, a check valve is formed in a linear intersecting shape at the most distal end point of the neck, and simultaneously molded and integrated therewith when forming the neck part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a tube container with a check valve for storing high-viscosity contents.
More specifically, the present invention relates to a tube container with a check valve that pushes a container body portion to extrude a predetermined amount and easily cuts an appropriate amount at the end of the mouth and neck.

Conventional metal tube containers made of aluminum or tin have been widely used for a long time as tube containers using small amounts of paste. These metal tubes were excellent in barrier properties and good in squeezing contents.
However, metal tubes have the disadvantages of corrosion caused by inorganic or organic chemicals such as acids, alkali components, and salts, and in order to improve this, various molding methods mainly comprising at least a polyolefin-based thermoplastic resin are used. Plastic tube containers are used.
And in order to give gas barrier property to a plastic tube container, the laminated tube container laminated | stacked with the plastic film etc. which vapor-deposited aluminum foil, a metal, or the metal oxide is used.
However, since the plastic tube container is excellent in elasticity, it tends to cause a back flow of air after squeezing out.Therefore, a plastic tube container in which a check valve formed on a punched sheet is integrated at the most distal end of the mouth and neck portion is used. It has been proposed (see, for example, Patent Document 1).
JP-A-11-105896

  However, the conventional plastic tube container is a tube container in which a check valve, in which a plastic sheet has been punched in advance, is later welded to the most advanced part of the mouth-and-neck part by heat-sealing, which takes time and labor to manufacture. There was a problem of becoming a factor.

  An object of the present invention is to provide a tube container with a check valve that prevents the backflow of air from the mouth and neck after the contents have been pushed out and easily cuts an appropriate amount of the contents at the end of the mouth and neck. It is a thing.

  Therefore, in order to solve the above problems, in the tube container with a check valve of the present invention, the body is formed of a cylinder formed by heat-sealing a multilayer laminated film into a cylindrical shape, and is formed in one opening of the cylinder. In a laminated tube container formed by attaching a shoulder portion and a mouth and neck portion formed by molding a synthetic resin, the innermost layer of the trunk portion, the shoulder portion and the mouth and neck portion are made of a thermoplastic resin, and the outermost portion of the mouth and neck portion is formed. The tube container with a check valve is characterized in that a check valve is formed in a linear cross shape at the end, and is formed and integrated at the same time when the mouth-neck part is formed.

  According to the tube container with a check valve of the present invention, the manufacturing process is compared with a conventional check valve in which a plastic sheet is punched out in advance, or a laminated tube container in which a check valve that has been molded in advance is attached to the mouth and neck. It can be shortened and the cost can be reduced.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic cross-sectional view of a tube container provided with a check valve.
A tube container 10 with a check valve according to the present invention has a head 4 composed of a shoulder 2 and a mouth-and-neck portion 3 attached to an end of a body portion 1 by an injection molding method or a compression-molding method. The check valve 6 that intersects linearly with the outermost end 5 is integrally attached by simultaneous molding.
The trunk portion 1 is a cylindrical body made of a laminate, and may be a cylinder by stacking a laminated sheet, or may be a cylinder by multilayer extrusion molding. The laminate tube container is based on the former method.

The material of the innermost layer of the body portion 1 is made of polyolefin resin such as polyethylene and polypropylene for general contents, and further contains a medicinal component, aroma component, highly volatile component, etc. For external products, cosmetics, industrial products, etc., selective adsorption of such components, non-adsorbent resin with little selective permeation, such as polyacrylonitrile copolymer (hereinafter referred to as PAN) or ethylene / vinyl alcohol copolymer (hereinafter referred to as PAN). EVOH) and the like can be preferably used.
The non-adsorbent resin PAN used in the tube container 10 with a check valve according to the present invention has high gas barrier properties, chemical resistance, good aroma retention, and invade essential oils such as menthol, limonene and camphor. It has excellent physical properties such as non-adsorptivity with little adsorption and permeation of highly volatile components.
EVOH is a resin that has excellent gas barrier properties in a dry state, little selective adsorption and permeation of the aforementioned chemical components, and also exhibits excellent physical properties in terms of barrier properties and non-adsorption properties.
In addition, polyethylene is a resin that has excellent physical properties such as excellent flexibility as a tube container and good touch.

In the body 1, materials other than the innermost layer can be selected, but it is preferable to use a polyolefin-based resin for the outer layer from the viewpoint of touch, texture, and economy.
Further, the same resin as the innermost layer of the body 1 is used for the material of the head 4 so that the body 4 can be satisfactorily bonded. When non-adsorptive resin is used for the innermost layer of the body 1, the non-adsorptive resin is used from the viewpoint of maintaining the quality of the contents of at least the inner surface of the head 4 and the integrated check valve material. Is preferably used. Further, the open end of the neck 3 is weakly sealed with a plastic film or sheet having a non-adsorptive resin layer such as PAN or EVOH on the innermost surface, or a similar plastic film or sheet is opened as a packing material. It is preferable to improve the barrier property and non-adsorption property at the open end by applying to the end and tightening with a screw cap.
Moreover, milky white PE is the polyethylene which blended the white pigment, By it, the effect which improves the surface decoration effect of the tube container 10 with a non-return valve by this invention can be given. As this surface decoration means, any known means such as silk screen printing, offset printing, gravure printing (laminate tube) printing or foil pressing may be used. Further, as part of the surface decoration, pearlescent mica powder or the like may be blended in place of the white pigment.

Moreover, it is preferable to use the same resin as the innermost layer of the body part 1 for the material of the head 4 so that the head part 1 can be satisfactorily bonded.
When non-adsorptive resin is used for the innermost layer of the body 1, the contents of the check valve 6 integrated with the inner surface of the head 4 and the outermost end 5 of the neck 3 are maintained. From this point, it is preferable to use a non-adsorbing resin.
Further, the open end of the neck 3 is weakly sealed with a plastic film or sheet having a non-adsorptive resin layer such as PAN or EVOH on the innermost surface, or a similar plastic film or sheet is opened as a packing material. It is preferable to improve the barrier property and non-adsorption property at the open end by applying to the end and tightening with a screw cap.

The tube container 10 with a check valve according to the present invention is a tube container in which a check valve 6 is integrally attached to the outermost end portion 5 of the mouth and neck portion 3.
In the tube container 10 with a check valve according to the present invention, the check valve 5 is formed by crossing the outermost end portion 5 of the mouth / neck portion 3 linearly.
FIG. 2 is a plan view showing an example of the shape of the check valve.
As shown in FIG. 2, the check valve can be punched into an arbitrary shape such as a single letter, a cross, a *, or a star to form a check valve. Further, the check valve 6 when the contents are squeezed out is pushed upward like 7 by the pressure of the contents as shown in FIG. When the squeezing is stopped, the check valve 7 has time to return to the old position, and the contents pushed out from the mouth and neck 3 are attached to the check valve. Air can be prevented from entering the neck 3 or the shoulder 2, and the effect of preventing the air from flowing back into the container can be achieved.

  In general, the strength of the air bag of the multilayer plastic tube container varies depending on the rigidity of the laminated film used for the body 1. In addition, since PAN and EVOH have high rigidity compared to polyolefin resin and the like, air bags are likely to occur, and the air that has flowed back into the body 1 during the use of the multilayer plastic tube container promotes deterioration of the quality of the contents. Cause. Accordingly, the check valve 6 in the tube container 10 with the check valve according to the present invention covers the defect that when PAN, EVOH or the like non-adsorptive resin is used, it easily causes an air bag such as PAN or EVOH. However, these non-adsorptive merits can be fully exhibited.

In the tube container 10 with a check valve according to the present invention, there are the following methods for forming the head portion 4 and attaching it to the cylindrical body portion 1, and any of these may be adopted.
(1) Compression molding method A check valve is provided by attaching the body 1 to a mandrel, extruding a predetermined amount of molten thermoplastic resin into the cavity or the core at the tip of the mandrel, and compressing the cavity and the core. The head portion 4 with 6 is integrally molded and simultaneously fused to the end portion of the body portion 1.
(2) Injection molding method The head part 4 is injection-molded in advance using a thermoplastic resin and thermally bonded to the end of the body part 1. Alternatively, the body part 1 is mounted on the core side, one end of the body part is inserted into the core at the time of clamping, and the head part 4 is fused to the body part 1 simultaneously with the injection molding of the head part 4. (Insert injection molding method)

The invention is further described in detail by means of examples.
As a barrier film, a pattern layer was provided by gravure printing on a stretched polyester film having a thickness of 12 μm deposited on aluminum. Further, a polyolefin film of a low density polyethylene film having a thickness of 130 μm was laminated on the barrier film via a two-component reaction curable adhesive layer on the pattern layer. Then, a transparent resin layer made of a transparent polyethylene film having a thickness of 130 μm is laminated on the side where the polyester pattern layer is not provided via a two-component reaction-curable adhesive layer having the same composition as the adhesive, and a layer structure A laminated sheet for a cylinder part was prepared comprising: polyethylene film layer (130 μm) / adhesive layer / aluminum-deposited stretched polyester film layer (12 μm) / pattern layer / adhesive layer / low density polyethylene film layer (130 μm) .
Next, the laminated sheet is cut to a desired width, heat sealed so that the outer polyethylene film layer and the inner polyethylene film layer are in contact with each other, the outer diameter is 38 mm, the body length is 150 mm, and the inner capacity is 100 cc. The cylinder part 6 with the specifications of was formed.
Furthermore, the tube container which provided the shoulder part 2 and the mouth neck part 3 by compression molding as shown in FIG. 1 using the low density polyethylene was formed.
When the mouth / neck portion 3 is molded, a film-like check valve that covers the outermost portion 5 of the mouth / neck portion 3 is simultaneously formed with a thickness of 0.1 mm to 0.2 mm, and the membrane-shaped reverse valve is further formed. The check valve 6 was formed by slitting the stop valve in a linear cross shape, and the tube container 10 of the present invention made of the laminated sheet of Example 1 was produced.
In addition, the linear slit of the check valve 6 could be formed by compression molding in a shape in which a slit was previously formed using a molding die.

The tube container of the Example obtained above was filled with condensed milk, and was attached to the end of the mouth-and-neck portion 3 in a peelable manner with a film having polyethylene on the innermost surface, and then a screw cap was tightened.
As for the tube container of the Example obtained above, deterioration of the content was hardly seen.
Moreover, after extruding a certain amount of the contents, the check valve 6 was able to prevent the air bag and improve the liquid drainage.
The tube container of the example could shorten the manufacturing process and reduce the cost as compared with the laminated tube container in which the check valve formed in advance was attached to the mouth and neck.

A pattern layer was provided by gravure printing on a barrier film of a saponified ethylene / vinyl acetate copolymer film having a thickness of 15 μm as a barrier film. Further, a polyolefin film of a low density polyethylene film having a thickness of 130 μm was laminated on the barrier film via a two-component reaction curable adhesive layer on the pattern layer. Then, a transparent resin layer made of a transparent polyethylene film having a thickness of 130 μm is laminated on the side where the polyester pattern layer is not provided via a two-component reaction-curable adhesive layer having the same composition as the adhesive, and a layer structure , A laminated sheet for a cylinder part composed of a polyethylene film layer (130 μm) / adhesive layer / saponified ethylene / vinyl acetate copolymer film layer (15 μm) / pattern layer / adhesive layer / low density polyethylene film layer (130 μm) Created.
Next, the laminated sheet is cut to a desired width, heat sealed so that the outer polyethylene film layer and the inner polyethylene film layer are in contact with each other, the outer diameter is 38 mm, the body length is 150 mm, and the inner capacity is 100 cc. The cylinder part 6 with the specifications of was formed.
Furthermore, the tube container which provided the shoulder part 2 and the mouth neck part 3 by compression molding as shown in FIG. 1 using the low density polyethylene was formed.
When the mouth / neck portion 3 is molded, a film-like check valve that covers the outermost portion 5 of the mouth / neck portion 3 is simultaneously formed with a thickness of 0.1 mm to 0.2 mm, and the membrane-shaped reverse valve is further formed. The check valve 6 was formed by slitting the stop valve in a linear cross shape, and the tube container 10 of the present invention made of the laminated sheet of Example 1 was produced.
In addition, the linear slit of the check valve 6 could be formed by compression molding in a shape in which a slit was previously formed using a molding die.

The tube container of the Example obtained above was filled with condensed milk, and was attached to the end of the mouth-and-neck portion 3 in a peelable manner with a film having polyethylene on the innermost surface, and then a screw cap was tightened.
As for the tube container of the Example obtained above, deterioration of the content was hardly seen.
Moreover, after extruding a certain amount of the contents, the check valve 6 was able to prevent the air bag and improve the liquid drainage.
The tube container of the example could shorten the manufacturing process and reduce the cost as compared with the laminated tube container in which the check valve formed in advance was attached to the mouth and neck.

  Applications of the tube container of the present invention include, for example, foods such as condensed milk, honey, mayonnaise, ketchup, knead wasabi, mustard, pharmaceuticals containing special medicinal ingredients, aromatic ingredients, cosmetics, industrial chemicals, etc. The tube container is filled and used, and is a tube container capable of preventing the product from jumping out together with air and preventing the contents from being altered by the backflowed air, and is not particularly limited.

It is the tube container cross section schematic which provided the check valve. It is a top view which shows the example of the shape of a non-return valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mouth and neck part 2 Endmost part 3 Check valve 4 Check valve 5 at the time of squeezing Shoulder part 6 Trunk part 10 Tube container with check valve

Claims (1)

The body part is formed by a cylinder formed by heat-sealing a multilayer laminated film into a cylindrical shape, and a laminate formed by attaching a shoulder part and a mouth-and-neck part formed by molding synthetic resin to one opening part of the cylinder In tube containers,
The innermost layer of the torso, shoulder and mouth and neck are made of thermoplastic resin,
A laminated tube container, characterized in that a check valve is formed in a linear cross shape at the outermost end of the mouth-neck portion, and is integrally molded and integrated when the mouth-neck portion is molded.

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