JPH05337982A - Tube container manufacturing method - Google Patents

Abstract

PURPOSE:To integrally mold a head part and a body part using a resin by mounting a tubular container body part composed of a cylindrical molded object of a laminated sheet on the outer periphery of a mandrel like male mold and clamping the male mold and a female mold to form a cavity to inject a molten thermoplastic resin into the cavity. CONSTITUTION:A cylindrical molded object 2 obtained by forming a laminated sheet into a cylindrical shape is mounted on the outer periphery of a mandrel like male mold 2 and the male mold 2 and a female mold 4 are temporarily clamped to form a cavity 5. A molten nitrile resin is injected into the cavity 5 from a die nozzle 6 and, then, the molds 2,4 are perfectly clamped to form a tube container head part 8 to one end of the tube container body part 2 from the resin. That is, the head part 8 consists of a fine neck like mouth part 9 and the fan-shaped shoulder part 10 continued thereto and integrally formed along with the body part 2 to be bonded to the body part 2. Therefore, the body part 2 and head part 8 of a tube container 1 can be strongly bonded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a method of manufacturing a tube container in which a paste-like material is filled.

[0002]

2. Description of the Related Art A tube container is composed of a cylindrical body made of laminated sheets and a tube container head made of a thermoplastic resin joined to one end of the body, that is, a cylindrical mouth. A tube container formed of a container head composed of a neck and a frusto-conical shoulder connected to the mouth and neck, and a separately-made tube container head molded by injection molding or the like and formed of a tubular molded body. A method of heat-sealing to one end of the body, or a male mold equipped with a container body made of a tubular molded body,
By using a female mold equipped with a thermoplastic resin-made head-molding material molded into a donut shape, and compression-molding the head-molding material between the pair of female and male molds, It is manufactured by, for example, a method of forming a head portion having a mouth neck portion and a shoulder portion connected to the mouth neck portion at one end of a container body formed of a tubular molded body and simultaneously joining the head portions.

[0003]

In the conventional method of manufacturing a tube container described above, a method of heat-sealing a separately manufactured tube container head to one end of a container body made of the former cylindrical molded body is The process of forming the container head and the process of heat-sealing the tube container head to one end of the container body are performed by different systems, and the labor for that is complicated, and the tube container head and the container The joint with the body is not stable.

In the latter case of compression-molding a doughnut-shaped thermoplastic resin head-forming material, it is necessary to form the donut-shaped head-forming material, and When the doughnut-shaped head-forming material is heat-melted and compression-molded, it is necessary that the head-forming material has an orderly donut shape. For example, polyethylene resin may be used as a resin satisfying such conditions. However, it has a drawback that the type of resin that can maintain an orderly donut shape during compression molding is extremely limited.

On the other hand, according to the present invention, it is not necessary to preliminarily mold a separately manufactured tube container head or head forming material, and a thermoplastic resin for molding the tube container head is used. Is not particularly limited, and is particularly known as a resin having a high melting temperature or a resin having low fluidity or elasticity when melted, for example, a gas barrier resin,
Since the melting temperature is high and the fluidity when melted is low, it cannot be applied to compression molding using the above-mentioned material for head molding. Nitrile resin {for example, in Japanese Patent Publication No. 57-60234. There is also provided a method for manufacturing a tube container capable of forming the described Barex: registered trademark} or the like as a tube container head.

[0006]

According to a first aspect of the present invention, there is provided a method for manufacturing a tube container, wherein a tube container body made of a laminated sheet is attached to the outer periphery of a mandrel-shaped male die, and then the mandrel-shaped body is attached. Forming a cavity between the mandrel-shaped male mold and female mold by clamping between the male mold and the female mold, and then injecting a molten thermoplastic resin into the cavity. Thus, the tube container head made of a thermoplastic resin is integrally molded and simultaneously joined to one end of the tube container body.

According to a second aspect of the present invention, there is provided a method of manufacturing a tube container, in which a tube container body made of a laminated sheet is attached to the outer periphery of a mandrel-shaped male die, and then the mandrel-shaped male die and the female die are attached. A cavity is formed between the mandrel-shaped male mold and the female mold by temporary clamping between the mold and the mold, and then the molten thermoplastic resin is injected into the cavity, and then the mold is completely clamped. By doing
The tube container head made of a thermoplastic resin is integrally molded and simultaneously joined to one end of the tube container body.

[0008] A mandrel-shaped male mold for mounting a tube container body made of a cylindrical molded body made of laminated sheets has an outer shape of a cylindrical portion having a small diameter and a divergent end which is continuous with the cylindrical portion having a small diameter. A frusto-conical portion and a large-diameter cylindrical portion that is continuous with the frusto-conical portion are formed, and the outer circumference of the mandrel-shaped male-shaped large-diameter cylindrical portion that forms the outer shape is formed into a tubular shape. Attach the body of the tube container.

Further, the cavity formed between the mandrel-shaped male mold and the female mold to which the tube container body made of the cylindrical molded body is mounted is a thin cylindrical portion of the male mold. It is formed between the frustoconical portion and the female mold.

In the method of manufacturing a tube container according to the present invention having the above-mentioned structure, the tubular molded body to be mounted on the outer periphery of the mandrel-shaped male large-diameter cylindrical portion is, as described above, the container body of the tube container. And a pair of sides of the laminated sheet comprising a surface layer made of a polyolefin resin or the like-a core layer made of an aluminum foil or a gas barrier resin layer-a back layer having heat-sealing properties It is obtained by superposing and adhering parts to each other, and a tubular molded body used in the production of ordinary tube containers can be used as it is.

The molten thermoplastic resin injected into the cavity formed by temporarily clamping the mandrel-shaped male and female dies on which the tubular molded body is mounted is And a raw material for forming a tube container head composed of a shoulder portion connected to the mouth and neck, for example, polyolefin resin such as polyerylene and polypropylene, polyamide, ethylene-vinyl alcohol copolymer resin,
Further, polyester, and a nitrile resin having a high melting temperature and low fluidity when melted may be used.

[0012]

EXAMPLES The specific constitution of the method for producing a tube container of the present invention will be described below with reference to examples.

"Example 1" (1) "Manufacture of a tubular molded product from a laminated sheet" From the front surface side to the back surface side, a "Nitrile resin [Barex (registered trademark)] film (surface layer having a thickness of 30 µ )
/ Biaxially oriented polyethylene terephthalate film with a thickness of 12μ and aluminum foil with a thickness of 9μ (core layer) / Thickness 5
A laminated sheet obtained by dry laminating each layer of a 0 μ nitrile resin [Valex (registered trademark)] film (back surface layer) was used to form one side part and the other side part using a mandrel. Were laminated into a tubular shape, and the back surface layer and the surface layer of the laminated sheet in the overlapping portion were high-frequency welded to obtain a tubular molded body to be a tube container body.

(2) "Manufacture of a tube container" In [Fig. 1] and [Fig. 2], the cylindrical molded body 2 made of the above-mentioned laminated sheet is attached to the outer periphery of the mandrel-shaped male die 3, By temporarily clamping the male die 3 and the female die 4 of the above, a cavity 5 is formed between the mandrel-shaped male die 3 and the female die 4, and then, in the cavity 5. After the molten nitrile resin [Barex (registered trademark)] is injected from the die nozzle 6 connected to the injection molding machine, complete mold clamping is performed, and one end 7 of the tube container body 2 is A tube container head 8 made of a nitrile resin, that is, a tube container head 8 composed of a neck portion 9 of a thin neck and a shoulder portion 10 continuous to the mouth portion 9 and having a frusto-conical shape. At the same time, they are joined, and the symbols are given in [Fig. 3]. In to obtain a tubular container to be displayed.

The mandrel-shaped male mold 3 has an outer shape of a cylindrical portion 11 having a small diameter, a frusto-conical portion 12 diverging toward the end which is continuous with the cylindrical portion 11 having the narrow diameter, and the truncated conical portion. 12
And a cylindrical portion 13 having a large diameter that is continuous with. The cavity 5 formed between the mandrel-shaped male die 3 and the female die 4 has a small-diameter cylindrical portion 11 of the mandrel-shaped male die 3 and a divergent end continuous with the thin-diameter cylindrical portion 11. It is formed between the frusto-conical portion 12 and the female die 4, and the shape of the cavity 5 and the shape of the tube container head 8 are the same.

"Example 2" (1) "Manufacture of a tubular molded body from a laminated sheet" From the front surface side to the back surface side, "100 µm thick ethylene-vinyl alcohol copolymer resin film (surface layer)"
/ Biaxially oriented polyethylene terephthalate film with a thickness of 12μ and aluminum foil with a thickness of 9μ (core layer) / Thickness 1
A laminated sheet obtained by dry laminating each layer of "00 μm ethylene-vinyl alcohol copolymer resin film (rear surface layer)" is overlaid on one side and the other side using a mandrel. They were combined into a tubular shape, and the back surface layer and the surface layer of the laminated sheet in the overlapping portion were high-frequency welded to obtain a tubular molded body to be a tube container body.

(2) "Manufacture of tube container" The cylindrical molded body of the above-mentioned laminated sheet was mounted on the outer periphery of a mandrel-shaped male mold in the same manner as in Example 1, and the mandrel-shaped male mold and female mold were attached. A cavity is formed between the mandrel-shaped male mold and the female mold by performing mold clamping between the cavity and the ethylene-vinyl alcohol copolymer resin in the cavity. Is injected from a die nozzle connected to the tube container head made of ethylene-vinyl alcohol copolymer resin to one end of the tube container body, that is, the neck and neck of the thin neck and the end spread which is continuous with the mouth and neck. -Shaped tube-conical shoulders and tube-shaped container heads are integrally molded and joined together,
A tube container was obtained.

In the tube containers obtained in the above Examples 1 and 2, the tube container head molded by injection molding and the joint surface of the cylindrical molded body made of the laminated sheet are made of the same resin. Therefore, extremely strong adhesive strength was obtained between the head of the tube container and the body of the tube container made of a tubular molded body.

[0019]

According to the method of manufacturing a tube container of the present invention, after the mouth and neck which becomes the head of the tube container and the shoulder which is continuous with the mouth and neck are formed in separate steps by, for example, injection molding, A female mold that is attached to one end of a tubular container body made of a laminated sheet with a laminated sheet by heat welding, or a doughnut-shaped thermoplastic resin head molding material that is molded in a separate process is used However, as compared with the tube container manufacturing method in which the tube container head is molded and adhered by compression molding the head molding material between a pair of female and male molds, Therefore, it is not necessary to perform molding in a separate system, and the manufacturing process is simplified.

Further, in the method of manufacturing the tube container of the present invention, since the resin can mold the tube container head by injection molding, the molding and joining of the tube container head can be performed at the same time with any resin. For example, a nitrile resin that cannot be applied to compression molding using a head molding material because of its high melting temperature and low fluidity when melted can be used, and the tube container head There is no limitation on the resin for molding the part.

Further, in the method for producing a tube container according to the present invention, the joining between the tube container head and the tube container body is made by welding molten resin in the injection molding step of the tube container head. Therefore, stable bonding strength can be obtained between the two.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing an intermediate step in a method for manufacturing a tube container according to the present invention.

FIG. 2 is a cross-sectional view of essential parts showing another intermediate step of the method of manufacturing a tube container of the present invention.

FIG. 3 is a sectional view of an essential part of a tube container obtained by the method of the present invention.

[Explanation of symbols]

1: Tube container 2: Cylindrical molded body to be the body of the tube container 3: Mandrel-shaped male mold 4: Female mold 5: Cavity formed by mandrel-shaped male mold and female mold 6: For injection molding machine Connected die nozzles 7: One end of the tubular molded body 8: Tube container head 9: Mouth and neck 10: Shoulder

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B29L 22:00 4F

Claims (2)

[Claims] 1. A tube container body formed of a tubular molded body made of a laminated sheet is attached to the outer periphery of a mandrel-shaped male die, and then the mandrel-shaped male die and the female die are clamped to each other. A cavity is formed between the mandrel-shaped male mold and the female mold, and then a molten thermoplastic resin is injected into the cavity to form a tube made of the thermoplastic resin on one end of the tube container body. A method of manufacturing a tube container, characterized in that the container head is integrally molded and joined. 2. A tube container body formed of a tubular molded body of laminated sheets is mounted on the outer periphery of a mandrel-shaped male mold, and then the mandrel-shaped male mold and the female mold are temporarily clamped. By forming a cavity between the mandrel-shaped male mold and the female mold and then injecting the molten thermoplastic resin into the cavity and completely clamping the mold, one end of the tube container body On the other hand, a method of manufacturing a tube container, characterized in that the tube container head made of a thermoplastic resin is integrally molded and joined.