JP3100674B2 - Extruded tube container - 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 having heat resistance which can withstand retort sterilization after the filling is sealed, and relates to a state of the filling filled in the tube container. Provided from the outside.

[0002]

2. Description of the Related Art An extruded tube container in which a filling material of a fluid to a semi-fluid typified by a paste-like material is enclosed, a tube-shaped container body having a closed lower end, and a tube-shaped container body. The head is composed of a frustoconical shoulder continuous with the upper end of the part and a narrow neck of the mouth and neck contiguous to the shoulder, and a cap removably engaged with the mouth and neck.

[0003] In particular, in an extruded tube container in which an anaerobic filling material is enclosed, a metal foil such as an aluminum foil is used in a laminated sheet constituting a container body. The storage performance of the filling is fulfilled.

[0004]

By the way, the extruded tube container using the above-mentioned conventional metal foil such as an aluminum foil has excellent barrier properties due to the properties of the material of the tube container body. In addition, it is not possible to see through the filling material filled in the tube container from the outside. For this reason, not only is there a lack of an appealing effect to consumers, but it is not possible to check the remaining amount of the filling and the type of the filling from outside, which is inconvenient.

[0005] In contrast, the present invention provides an extruded tube container which allows the contents inside the tube container to be seen through from the outside and also has heat resistance to sterilization treatment by a retort.

[0006]

In order to solve the above-mentioned problems, an extruded tube container of the present invention comprises a transparent barrier layer and a transparent heat-sealing resin layer having a melting temperature of 110 ° C. or more. Surface layer and 11
Using a tube container body made of a laminated sheet having a transparent heat-sealable resin layer having a melting temperature of 0 ° C. or more, and a head made of a thermoplastic resin having a melting temperature of 110 ° C. or more. Use.

That is, the extruded tube container of the present invention comprises a tubular container body having a closed lower end,
The tubular container body has a frustoconical shoulder engaged with the upper end of the tubular body and a head composed of a narrow neck and a neck which is continuous with the shoulder. It is formed in a shape.

[0008] The tubular body forming the body of the tube container includes
A surface layer made of a transparent heat-sealing resin layer having a melting temperature of 10 ° C. or more, a back layer made of a transparent heat-sealing resin layer also having a melting temperature of 110 ° C. or more, and the surface layer and the back layer. The laminated sheet composed of the transparent barrier layer and the transparent barrier layer located between them is formed so that the back surface layer of the laminated sheet becomes the inner peripheral surface layer of the tube container. The transparent barrier layer in the laminated sheet is made of a thermoplastic resin film having a thin film layer of an inorganic oxide or an oxide of an amphoteric metal, and is 2.0 g / m ² · 24 hr (40 ° C., 90 RH) or less, and 2.0 cc / m ² · 24 hr (1
atm, 20 ° C., dry) or less.

[0009] Further, at the open end of the tube container body, a head comprising a frustoconical shoulder which is heat-sealed to the inner peripheral surface of the container body and a narrow neck mouth-neck portion continuous with the shoulder is provided.
Molded with a thermoplastic resin having a melting temperature of 110 ° C. or higher.

[0010] In the extruded tube container of the present invention having the above structure, the surface layer and the back surface layer in the laminated sheet formed on the tube container body are made of, for example, linear low-density polyethylene, high-density polyethylene, polypropylene, or the like. It is formed in a thickness of about 50 to 100 μm. When the front surface layer and the back surface layer are formed of the same resin, the heat welding step when forming the tube container body with the laminated sheet is extremely easy, and the sealing by the heat bonding part is performed. The adhesive strength of the part increases.

The barrier layer located between the front layer and the back layer is usually subjected to decorative processing by printing, but the decorative processing is performed so that the entire body of the tube container is not opaque. Of course.

The transparent barrier layer is made of a thermoplastic resin film having a thin layer of an inorganic oxide or an oxide of an amphoteric metal, and has a thickness of 2.0 g / m ² · 24 hr (4
0 ℃, 90% RH) or less and 2.0 cc /
and a barrier performance that satisfies at least one of oxygen permeability of not more than m ² · 24 hr (1 tm, 20 ° C., dry). The thermoplastic resin film having a thin film of an inorganic oxide or an oxide of an amphoteric metal used as the transparent barrier layer is made of, for example, nylon, polyester, polypropylene or the like having a thickness of 9 to 50 μm.
For a thermoplastic resin film composed of a biaxially stretched film having a thickness of about 1 mm, a thickness of 1 mm, such as tin oxide, zinc oxide, silicon oxide, indium oxide, titanium oxide, aluminum oxide, etc.
It consists of a thin film layer formed by vacuum evaporation, sputtering, chemical vapor deposition, or the like, having a thickness of about 00 to 5000, preferably about 400 to 1000. Further, as the inorganic oxide thin film layer, in the case of silicon oxide, coloring is extremely small and good barrier properties can be obtained.

The surface layer and the barrier layer, and the barrier layer and the back surface layer are generally adhered to each other with an adhesive. For example, they are laminated by a dry lamination method using a urethane-based adhesive or the like. Is done.

The tube container body is made of a tubular body made of the above laminated sheet, and is formed in a cylindrical shape such that the backside layer of the other side comes in contact with the surface layer of one side of the laminated sheet. It is formed on the body and is obtained by heat-welding the sides.

The head consisting of a frustoconical shoulder which is heat-welded to the inner peripheral surface of the container body at the open edge of the tube body and a mouth-neck portion of a narrow neck continuous with the shoulder is formed of a laminated sheet. When it is formed of a thermoplastic resin of the same quality as that of the back surface layer, the thermal adhesion between the two is good.

[0016]

The extruded tube container according to the present invention has extremely excellent heat resistance in the tube container body and the mouth and neck, which can withstand boil sterilization and retort sterilization. It has transparency so that the contents inside the container can be seen through.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The concrete constitution of the extruded tube container for retort treatment of the present invention will be described with reference to production examples.

EXAMPLE 1 In FIG. 1, a vacuum deposition layer 3 of silicon oxide (SiO _x ) having a thickness of 500 ° was formed on one side of a PVA film 2 having a thickness of 15 μm to form a barrier oxide film comprising a silicon oxide deposition film. 4, and then vacuum-deposited layer 3 of silicon oxide.
The surface is subjected to decorative processing 5 by printing, and further, a 130 μm thick linear medium-density polyethylene (melting temperature 125 ° C.) film having one surface subjected to corona discharge treatment on both the front and back surfaces of the barrier film 4. The transparent laminated sheet 1 was obtained by laminating the corona discharge treated surfaces 6 and 7 using a urethane-based adhesive. The water vapor permeability of the barrier film 4 is 0.5 g / m ² · 24.
hr (40 ° C., 90% RH), oxygen permeability is 0.6 cc
/ M ² · 24 hr (1 atm, 20 ° C., dry).

Subsequently, after punching the laminated sheet 1 to obtain a blank plate for the tube container body, the left and right side portions of the blank plate are overlapped and thermally bonded to each other to form the blank. The low-density polyethylene resin film on the plate has a diameter of 35 mm and a height of 150 m as the inner peripheral layer.
m was molded.

Thereafter, the cylindrical body is mounted on a mandrel for forming a tube container, and one end of the cylindrical body has a frusto-conical shoulder portion and a narrow neck neck and neck portion which is continuous with the shoulder portion. The head is formed by injection molding with a linear medium-density polyethylene resin “melting temperature: 125 ° C.” resin, and is an extruded tube which is a product of one embodiment of the present invention and has a schematic shape indicated by reference numeral 8 in FIG. A container was obtained.

Example 2 During the manufacturing process of the laminated sheet 1 of Example 1,
Instead of the 5μ PVA film 2, a 12μ thick biaxially stretched polyester film is used.
In place of the linear medium-density polyethylene films 6 and 7 above, a block random block type polypropylene resin (melting temperature: 160 ° C) film with a thickness of 80μ is used, and a frustoconical shoulder and a continuous narrow neck are used. The head consisting of the mouth and neck is molded of polypropylene resin [melting temperature: 135 ° C.], and the other steps are the same as the corresponding steps in Example 1 to form a laminate for the transparent tube container body. I got a sheet. The barrier film 4 made of a biaxially stretched polyester film having a vacuum deposited layer of silicon oxide has a water vapor transmission rate of 0.9.
g / m ² · 24 hr (40 ° C., 90% RH) and an oxygen permeability of 1.0 cc / m ² · 24 hr (1 atm, 2
0 ° C., dry).

Subsequently, by using the laminated sheet for the body of the tube container, an extruded tube container which is another example of the present invention is obtained by the same process as the forming process of the extruded tube container in Example 1. Was.

[Experiment] When the sealed tube container in which strawberry jam was sealed in the extruded tube container obtained in Example 1 was subjected to a boil treatment for 30 minutes with hot water at 95 ° C., no abnormality occurred. Was.

The sealed tube container in which strawberry jam was sealed in the extruded tube container obtained in Example 2,
Retort treatment at 21 ° C for 20 minutes, and 135 ° C for 2 minutes
When subjected to the retort treatment for 0 minutes, no abnormality occurred in any case.

[0025]

The extruded tube container of the present invention has an appealing effect at the time of display because the filling material can be seen through from the outside of the tube container, and confirms the remaining amount of the filling material and checks the filling material. Since the varieties can be confirmed from the outside, a sense of security is given to the consumer, and the tube container has high practical value.

[Brief description of the drawings]

FIG. 1 is a cross-sectional model view showing an example of a laminated sheet formed on a container body of an extruded tube container of the present invention.

FIG. 2 is a perspective view showing a schematic shape of an extruded tube container of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 laminated sheet for forming container body 4 barrier layer made of silicon oxide vapor deposited film 6 back layer 7 front layer 8 extruded tube container

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B65D 35/02

Claims (2)

(57) [Claims] 1. A tube container body comprises a transparent heat-sealable resin layer having a melting temperature of 110 ° C. or more and a transparent heat-sealable resin layer also having a melting temperature of 110 ° C. or more. A laminated sheet comprising a back layer and a transparent barrier layer made of a thermoplastic resin film having a thin film layer of an inorganic oxide or an oxide of an amphoteric metal located between the front layer and the back layer. And the transparent barrier layer is 2.0 g / m ² ·
Water vapor permeability of 24 hr (40 ° C., 90% RH) or less and 2.0 cc / m ² · 24 hr (1 atm, 20 ° C., dr)
y) The laminated sheet having a barrier property that satisfies at least one of the following oxygen permeability is formed so that the back surface layer of the laminated sheet becomes the trunk inner peripheral surface layer, and At the open edge of the tube container body, the head consisting of the frustoconical shoulder which is thermally fused to the inner peripheral surface of the container body and the mouth and neck of the narrow neck continuous with it has a melting temperature of 110 ° C. or higher. An extruded tube container formed of a thermoplastic resin having the following. 2. The extruded tube container according to claim 1, wherein the transparent barrier layer is subjected to decorative processing by printing.