JP3308591B2 - Extruded tube container and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extruded tube container mainly for filling a paste-like material, and more particularly to an extruded tube container exhibiting excellent storage characteristics when filling an inner material having high permeability. A manufacturing method is provided.

[0002]

2. Description of the Related Art An extruded tube container is formed of a cylindrical body formed of a laminated sheet, and a thermoplastic synthetic resin formed by injection molding or compression molding at one end of the cylindrical body. It is composed of a head, that is, a head made of a thermoplastic resin having a mouth and neck and a shoulder connected to the mouth and neck.

[0003] The tube container is required to have a high gas barrier property in order to enhance the preservation performance against the filling, and for the gas barrier property of the body, a laminated sheet on which metal foil is laminated is required. Is used as a laminated sheet for forming a trunk.

[0004]

As shown in FIG. 2, the tube container body made of the above-mentioned laminated sheet has the following features.
One side 10 and the other side 11 of the laminated sheet 9
Are laminated on top and bottom, and a so-called superposed and laminated body for bonding the back surface layer 12 and the surface layer 13 of the laminated sheet 9 is used.

[0005] In the tube container body made of such a cylindrical molded body, the surface layer and the back surface layer of the laminated sheet are made of the same resin layer in order to increase the adhesive strength of the bonding part (sealing part) of the body. Has formed. Further, at the bonding portion between the side portions of the laminated sheet, the end face of the laminated sheet located particularly on the inner peripheral surface side of the cylindrical molded body is not exposed, that is, the metal foil in the laminated sheet is a tube. In order to avoid contact with the filling in the container, the heat sealant layer forming the back surface layer 12 of the laminated sheet in the above-mentioned [FIG. A resin having high thermal fluidity, for example, a polyethylene resin, is used as the heat sealant layer 12 in the laminated sheet so that the end face of the laminated sheet can be completely covered.

However, the heat sealant layer made of a polyethylene resin or the like having a high thermal fluidity has a low retention effect on a permeable substance contained in, for example, pharmaceuticals, hair dyes, shoe polish, and medicated toothpastes. Is alcohol,
The ability to retain dyes and various medicinal components is low, and there is a problem in the storage performance of the filling.

For this reason, attempts have been made to use an ethylene-vinyl alcohol copolymer resin, polyacrylonitrile resin, or the like having an excellent action of retaining these substances as a heat sealant layer. Poor properties, in the heat welding process when obtaining a cylindrical molded body,
The end face of the laminated sheet cannot be completely covered, and the filling in the tube container and the metal foil in the laminated sheet are in direct contact at the end face of the bonding portion of the laminated sheet, which causes delamination and filling. Infiltration is inevitable.

On the other hand, according to the present invention, there is no direct contact between the inner peripheral surface of the cylindrical molded body made of the laminated sheet and the filling material in the tube container, and the inner peripheral surface layer of the tube container is prevented. Provide an extruded tube container having high retention properties for highly permeable substances and a method for producing the tube container.

[0009]

Means for Solving the Problems A first aspect of the present invention relates to a cylindrical molded article made of a laminated sheet, and a single-layer blow tube formed by blow molding of a thermoplastic resin loaded inside the cylindrical molded article. An extruded tube container having a thermoplastic resin shoulder and a head with a mouth and neck formed and joined to one end of a cylindrical molded body of the laminated sheet by injection molding or compression molding. Become. The single-layer blow tube in the extruded tube container according to the first aspect of the present invention has one end generally along the shape of the head formed by the thermoplastic resin shoulder and the mouth and neck. The single-layer blow tube has a mouth-and-neck portion protruding outward from an open portion forming one end of the cylindrical molded body of the laminated sheet. It is loaded inside the cylindrical molded body.

Further, in the extruded tube container according to the first aspect of the present invention, a head made of a thermoplastic resin shoulder and a mouth and neck joined to one end of a cylindrical molded body made of a laminated sheet. At least a portion between the upper portion and the head-shaped portion of the single-layer blow tube is bonded and fixed via a bonding insert member.

The second aspect of the present invention is directed to a cylindrical molded article formed of a laminated sheet, a single-layer blow tube formed by blow molding a thermoplastic resin loaded inside the cylindrical molded article, and a cylinder formed of the laminated sheet. It comprises an extruded tube container having a shoulder made of thermoplastic resin and a head made of a mouth and a neck which are molded and joined to one end of the shaped article by injection molding or compression molding. The single-layer blow tube formed by blow-molding the thermoplastic resin has one end formed as a head-shaped portion having a mouth, a neck, and a shoulder, and one end of a tubular molded body formed of the laminated sheet. The mouth-and-neck portion of the head-shaped portion protrudes outward from the open portion forming the end of the head-shaped portion, and is loaded inside the cylindrical molded body, and the outside diameter of the mouth-and-neck portion is the thermoplastic resin. Is formed slightly larger than the inner diameter of the mouth-and-neck portion, and the mouth-and-neck portion of the head-shaped portion and the mouth-and-neck portion of the thermoplastic resin are formed by the flexible deformation of the mouth-and-neck portion of the head-shaped portion. Mated.

An extruded tube container according to a third aspect of the present invention comprises: a tubular molded body made of a laminated sheet; a single-layer blow tube formed by blow molding of a thermoplastic resin loaded inside the tubular molded body; It consists of an extruded tube container having a thermoplastic resin shoulder and a head with a mouth and neck which are molded and joined by injection molding or compression molding to one end of a cylindrical molded body made of a laminated sheet. The single-layer blow tube formed by blow-molding the thermoplastic resin has one end formed as a head-shaped portion having a mouth, a neck, and a shoulder, and one end of a tubular molded body formed of the laminated sheet. It is loaded into the inside of the cylindrical molded body such that the mouth and neck in the head-shaped portion project outward from the open portion forming the end of
In addition, a pair of irregularities formed on the outer peripheral surface of the head-shaped portion and the inner peripheral surface of the head made of the thermoplastic resin mouth-neck portion and the shoulder portion form a single-layer blow tube. And a head made of thermoplastic resin formed by injection molding or compression molding.

[0013] In the method for manufacturing an extruded tube container according to the fourth aspect of the present invention, the step of obtaining a cylindrical molded body from a laminated sheet, and the step of forming the cylindrical molded body and a frusto-conical bonding insert member are performed by:
A frustoconical bonding insert member is located on the inner peripheral surface side of one end of the cylindrical molded body, and the frustoconical bonding insert member is outside the one end of the cylindrical molded body. Loading in a molding die in a positional relationship such that it protrudes in the direction, and a shoulder portion and a continuous portion of the shoulder portion with respect to one end of the cylindrical molded body loaded in the molding die. A step of molding the head by the mouth and neck by injection molding or compression molding of a thermoplastic synthetic resin, and from the other end of the cylindrical molded body by the laminated sheet, that is, the tail end of the body of the tube container From the open end portion, a single-layer blow tube formed by blow molding of a thermoplastic resin, and the mouth and neck of the single-layer blow tube protrude outward from one end of the cylindrical molded body of the laminated sheet. And inserting the thermoplastic resin At least between the head-shaped portion of the blow tube manufacturing the shoulder portion and neck and by the head and a single layer
The step of heat-welding the portion via the adhesive insert member to obtain the desired extruded tube container.

According to a fifth aspect of the present invention, there is provided a method for manufacturing an extruded tube container, comprising the steps of: obtaining a cylindrical molded body from a laminated sheet; loading the cylindrical molded body into a molding die; A step of molding a head by a shoulder and a mouth and neck portion continuous with the shoulder to one end of the cylindrical molded body loaded in by injection molding or compression molding of a thermoplastic synthetic resin; From the other end of the tubular molded body made of a sheet, a single-layer blow tube formed by blow molding of a thermoplastic resin is used. The outer peripheral surface of the head-shaped portion of the mouth and neck and the shoulder forming one end of a single-layer blow tube by blow molding of a thermoplastic resin by being inserted so as to protrude outward from the portion. Injection of thermoplastic synthetic resin By the method fitted to the inner peripheral surface of the head portion by a shoulder and neck by shape or compression molding,
Obtaining the desired extruded tube container.

In the extruded tube container and the method of manufacturing the same according to the present invention, the tubular molded product made of the laminated sheet includes a tubular molded product made of the laminated sheet used for the body of this type of extruded tube container. Can be used as is. A metal foil such as an aluminum foil is usually laminated in a laminated sheet formed into a cylindrical molded body, but a gas barrier property such as an ethylene-vinyl alcohol copolymer resin layer is contained in the laminated sheet. In the case where a resin layer excellent in quality is laminated, the metal foil is not always necessary. Examples of the laminated sheet formed into the cylindrical molded body include “polyethylene resin layer / polyethylene terephthalate resin layer / metal foil layer such as aluminum foil / polyethylene resin layer” and “polypropylene resin layer / polyethylene terephthalate resin layer / Metal foil layer such as aluminum foil / polypropylene resin layer ”,“ polyethylene resin layer /
A sheet having a laminated structure such as “ethylen-vinyl alcohol copolymer resin layer / polyethylene resin layer” is used.

A single-layer blow tube formed by blow-molding a thermoplastic resin, which is loaded inside a cylindrical molded body of a laminated sheet, usually has one end of the tube and a shoulder and a mouth of an extruded tube container. It is a tube head shape part along the shape of the head by the neck, and is formed by injection molding or compression molding on a cylindrical molded body made of a laminated sheet and one end of the cylindrical molded body. A single-layer blow tube formed by blow molding of a thermoplastic resin is attached to a head made of a thermoplastic resin shoulder and a mouth and neck. Further, a predetermined filling material is filled into the tube container from the other open end serving as the bottom of the tube container, and then closed.

The single-layer blow tube formed by blow-molding a thermoplastic resin is formed of a resin having a high barrier property against a permeable substance such as an ethylene-vinyl alcohol copolymer resin, a polyacrylonitrile resin, and a polyethylene terephthalate resin. You.

In the extruded tube container according to the first aspect of the present invention, the head formed by the shoulder and the mouth and neck made of the thermoplastic resin and the head-shaped part of the single-layer blow tube formed by the blow molding of the thermoplastic resin. The adhesive insert member interposed between at least one portion between the cylindrical molded body of the laminated sheet and the single-layer blow tube formed by blow molding of the thermoplastic resin, and in some cases, is formed of a thermoplastic resin. Between the head of the resin shoulder and the mouth and neck and the single-layer blow tube by blow molding of the thermoplastic resin, and, in some cases, by blow molding of the tubular molded body of the laminated sheet and the thermoplastic resin A frusto-conical shaped body obtained by hot-forming or press-forming a sheet having a heat-welding function is used to fix a single-layer blow tube. .

The most preferable embodiment of the bonding insert member is the same as the material for forming the inner peripheral surface layer of the cylindrical molded body of the laminated sheet or the head molding by the shoulder and the mouth and neck in the extruded tube container. Frustoconical shape obtained by using a laminated sheet of a first resin layer made of resin, an intermediate layer made of metal foil, and a material for forming a single-layer blow tube by blow molding and a second resin layer made of the same resin It is a molded object of. Further, a laminated sheet utilizing a resin having an excellent heat-welding performance, for example, a metal foil and a copolymer of propylene and an unsaturated carboxylic acid laminated on both front and back surfaces of the metal foil A frusto-conical shaped body or the like made of a laminated sheet of an acid-modified propylene resin layer made of the above and a polypropylene resin layer laminated on the acid-modified propylene resin layer is also suitable as the insert member for bonding.

Through the adhesive insert member, between the head portion of the thermoplastic resin shoulder and the mouth and neck portion and the head portion of the single-layer blow tube formed by blow molding of the thermoplastic resin, and In some cases, means for bonding at least a part of each between the tubular molded body of the laminated sheet and the single-layer blow tube by blow molding of the thermoplastic resin,
For example, hot air welding, high frequency welding, etc. may be used to seal the tail end of the cylindrical molded body made of the laminated sheet or the tail end of the single-layer blow tube loaded inside the cylindrical molded body. , Ultrasonic welding or the like.

In the method for manufacturing an extruded tube container according to the fifth aspect of the present invention, a single-layer blow tube formed by blow-molding a thermoplastic resin is formed from the other end of the cylindrical molded body of the laminated sheet. By inserting the mouth and neck of the blow tube so as to protrude outward from one end of the cylindrical molded body of the laminated sheet, one of the single-layer blow tubes by blow molding of a thermoplastic resin is inserted. Fits the outer peripheral surface of the head-shaped part of the mouth and neck forming the end and the shoulder, and the inner peripheral surface of the head by the shoulder and the mouth and neck by injection molding or compression molding of thermoplastic synthetic resin For example, the following two methods exist as the step of performing the process.

As a first method, for example, the outer diameter of the mouth and neck of a single-layer blow tube is molded and joined to one end of a cylindrical molded body of a laminated sheet by injection molding or compression molding. It is formed to be slightly larger than the inner diameter of the mouth and neck in the head by the shoulder and mouth and neck made of thermoplastic resin, and the mouth and neck in the head shape part and the mouth and neck made of the thermoplastic resin are placed. A method of fitting the mouth and neck of a single-layer blow tube by flexible deformation, and as a second method, an outer peripheral surface of a head-shaped portion of a single-layer blow tube and a mouth made of the thermoplastic resin. A pair of irregularities are formed on the inner peripheral surface of the head consisting of the neck and the shoulder, and the head is formed by injection molding or compression molding. Part and the method of fitting using this one or more pairs of irregularities To.

[0023]

In the extruded tube container of the present invention, the filling material to be filled in the container comes into contact with only the inner peripheral surface of the single-layer blow tube fixed inside the cylindrical molded body and fixed. Therefore, by forming a single-layer blow tube with a resin having resistance to a substance having high permeability, for example, polyacrylonitrile resin, ethylene-vinyl alcohol copolymer resin, polyethylene terephthalate resin, etc. Thus, an extruded tube having an extremely excellent effect on the storage performance of the filling material can be obtained.

Further, in the extruded tube container of the present invention, since a single-layer blow tube formed by blow-molding a thermoplastic resin is used, the production efficiency is improved as compared with, for example, the case of forming a multi-layer blow tube. And the manufacture of the extruded tube container is easy.

Further, in the extruded tube container of the present invention, the type of the filling material to be filled in the tube container can be best changed only by changing the material for forming the single-layer blow tube by blow molding of the thermoplastic resin. An extruded tube container that exhibits the corresponding storage performance.

In the method for manufacturing an extruded tube container of the present invention, the extruded tube container having the above-mentioned special function can be easily and accurately obtained.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One specific configuration of an extruded tube container and a method for producing the same according to the present invention will be described below with reference to embodiments.

(1) “Production of cylindrical molded body from laminated sheet” From the front side to the back side, the “polyethylene resin layer /
Polyethylene terephthalate resin layer / Aluminum foil /
A laminated sheet composed of a laminated structure of “polyethylene resin layer” is formed into a cylindrical shape by laminating one side portion and the other side portion using a mandrel, and forming a back surface layer of the laminated sheet in the laminated portion. And a surface layer were subjected to high frequency welding to obtain a cylindrical molded body.

(2) "Manufacture of an insert member for bonding" A laminated sheet comprising a soft aluminum foil having a thickness of 50 µ and a polyethylene film having a thickness of 80 µ on the surface and a polyacrylonitrile resin film having a thickness of 80 µ on the back surface. Using hot pressing, hot forming by pressurized air and subsequent punch forming, an adhesive insert member having a frustoconical shape was obtained.

(3) "Molding of Single-Layer Blow Tube" A blow-molded article having a tube-shaped extruded article made of polyacrylonitrile resin and having one end in the shape of a head of an extruded tube container. After that, the bottom of the blow-molded article was cut to obtain a single-layer blow tube having the other end open.

(4) "Manufacture of Extruded Tube Container" In FIG. 1, the above-mentioned cylindrical molded body 2 made of a laminated sheet and the bonding insert member 3 also made of the above-mentioned truncated conical molded body are combined. A frustoconical bonding insert member 3 abuts on the inner peripheral surface of the upper end of the cylindrical molded body 2 in the injection molding die, and furthermore, the upper end of the cylindrical molded body 2. After insertion is performed so that the frustum-shaped bonding insert member 3 protrudes further upward from the portion, the cylindrical molded body 2 and the bonding insert member are formed by injection molding of polypropylene resin. 3, a head 6 for an extruded tube container made of a polypropylene resin, comprising a mouth-neck portion 4 and a frustoconical shoulder portion 5 connected to the mouth-neck portion 4 was formed.

Thereafter, a single-layer blow tube 7 formed by blow-molding a thermoplastic resin is inserted into the mouth of the single-layer blow tube 7 from the open end, which is the other end of the cylindrical molded body 2 of the laminated sheet. The neck 8 is inserted so as to protrude further upward from the upper end of the cylindrical molded body 2 of the laminated sheet, and then the head 6 made of thermoplastic resin and a single piece formed by blow molding of thermoplastic resin. At least one part of each between the head-shaped part of the blow tube 7 of the layer and the part of the cylindrical molded body 2 of the laminated sheet and the blow tube 7 of the single layer by the blow molding of the thermoplastic resin are bonded. Welding was performed using high frequency waves via the insert member 3 for use, to obtain an extruded tube container 1 which was one embodiment of the present invention.

[Experiment] Extruded tube container (diameter: 2)
(5.4 mm) After sealing the mouth and neck 4 of the tube container 1 with a sealing member, the hair container is filled with a hair dye from the open end forming the tail end of the tube container 1, and then the tail of the single-layer blow tube 7 The open part forming the end and the open part forming the tail end of the cylindrical molded body 2 are connected to each other by a single welding process using a high frequency to form the inner peripheral surfaces of the single-layer blow tube 7 and the inner peripheral surface of the cylindrical molded body 2. The surfaces were welded to each other to form a sealed portion, thereby obtaining a sealed extruded tube container.

[0034]

The extruded tube container of the present invention can be used, for example, for penetrating substances contained in medicines, hair dyes, shoe polish, medicated toothpastes, etc., specifically, alcohols, dyes, various medicinal ingredients and the like. It has an excellent holding effect, and has a high preservation performance with respect to the filling, so that it has an excellent value in practical use.

According to the method for manufacturing an extruded tube container of the present invention, for example, an extruded tube container having an excellent function of retaining a permeable substance such as an alcohol, a dye, and various medicinal components can be easily and accurately prepared. Is obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of an extruded tube container of the present invention.

FIG. 2 is a schematic cross section showing an example of a joint state of a container body of a conventional extruded tube container.

[Explanation of symbols]

1: Extruded tube container 2: Cylindrical molded body 3: Adhesive insert member 4: Neck and neck of extruded tube container 5: Shoulder of extruded tube container 6: Thermoplastic synthesis consisting of mouth and neck 4 and shoulder 5 Resin head 7: Single-layer blow tube by blow molding of thermoplastic resin 8: Mouth and neck in single-layer blow tube 7

Claims (5)

(57) [Claims] 1. One of a cylindrical molded body formed of a laminated sheet, a single-layer blow tube formed by blow molding of a thermoplastic resin loaded inside the cylindrical molded body, and a cylindrical molded body formed of the laminated sheet A blow-molded single-layer thermoplastic resin in an extruded tube container provided with a thermoplastic resin shoulder and a head with a mouth and neck that are molded and joined by injection molding or compression molding at the ends of the tube. The blow tube has one end formed with a head-shaped portion of a mouth-neck portion and a shoulder, and the head-shaped portion is formed from an open portion forming one end of the tubular molded body of the laminated sheet. The head and the head of the single-layer blow tube are loaded into the cylindrical molded body so that the mouth and neck of the part protrude outward, and are formed of a thermoplastic resin shoulder and mouth and neck. At least one part between the shape part and the adhesive part An extruded tube container which is adhered via an insert member for use. 2. One of a cylindrical molded body made of a laminated sheet, a single-layer blow tube formed by blow molding of a thermoplastic resin loaded in the cylindrical molded body, and a cylindrical molded body made of the laminated sheet A blow-molded single-layer thermoplastic resin in an extruded tube container provided with a thermoplastic resin shoulder and a head with a mouth and neck that are molded and joined by injection molding or compression molding at the ends of the tube. The blow tube has one end formed with a head-shaped portion of a mouth-neck portion and a shoulder, and the head-shaped portion is formed from an open portion forming one end of the tubular molded body of the laminated sheet. The mouth and neck of the portion is loaded inside the cylindrical molded body so as to protrude outward, and the outside diameter of the mouth and neck is slightly larger than the inside diameter of the thermoplastic resin mouth and neck. And the mouth and neck in the head shape An extruded tube container characterized in that the mouth and neck made of thermoplastic resin are fitted by flexible deformation of the mouth and neck in the head-shaped portion. 3. One of a cylindrical molded body made of a laminated sheet, a single-layer blow tube formed by blow molding of a thermoplastic resin loaded in the cylindrical molded body, and a cylindrical molded body made of the laminated sheet A blow-molded single-layer thermoplastic resin in an extruded tube container provided with a thermoplastic resin shoulder and a head with a mouth and neck that are molded and joined by injection molding or compression molding at the ends of the tube. The blow tube has one end formed with a head-shaped portion of a mouth-neck portion and a shoulder, and the head-shaped portion is formed from an open portion forming one end of the tubular molded body of the laminated sheet. The mouth-and-neck portion of the portion is loaded inside the cylindrical molded body so as to protrude outward, and furthermore, the outer peripheral surface of the head-shaped portion, the mouth-and-neck portion of the thermoplastic resin and the shoulder portion Pair formed on the inner peripheral surface of the head An extruded tube container characterized in that the head-shaped portion of the single-layer blow tube and the head made of thermoplastic resin formed by injection molding or compression molding are fitted by unevenness. 4. A step of obtaining a cylindrical molded body from a laminated sheet, and attaching the cylindrical molded body and a frusto-conical bonding insert member to an inner peripheral surface of one end of the cylindrical molded body. The frusto-conical bonding insert member abuts, and the frusto-conical bonding insert member protrudes outward from one end of the cylindrical molded body. And a head formed by a shoulder and a mouth and neck portion connected to the shoulder with respect to one end of the cylindrical molded body loaded in the mold. A step of molding by injection molding or compression molding of a resin, and from the other end of the cylindrical molded body of the laminated sheet, a single-layer blow tube formed by blow molding of a thermoplastic resin, Part is one end of a cylindrical molded body of the laminated sheet And inserting at least one portion between a shoulder made of thermoplastic resin and a shoulder of a single-layer blow tube through an adhesive insert member. And a process for producing an extruded tube container. 5. A step of obtaining a cylindrical molded body from a laminated sheet, and a step of loading the cylindrical molded body into a molding die.
For one end of the cylindrical molded body loaded in the mold, a head composed of a shoulder and a mouth and neck portion following the shoulder is formed by injection molding or compression molding of a thermoplastic synthetic resin. A step of forming a single-layer blow tube by blow molding of a thermoplastic resin from the other end of the cylindrical molded body of the laminated sheet; The head-shaped portion of the mouth-neck portion and the shoulder portion forming one end of a single-layer blow tube formed by blow molding of a thermoplastic resin by being inserted so as to protrude outward from one end of the A step of fitting an outer peripheral surface of the head and an inner peripheral surface of a head formed by a shoulder portion and a mouth-and-neck portion by injection molding or compression molding of a thermoplastic synthetic resin. .