JP3329580B2 - Laminated sheet for tube container body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to toiletries such as toothpaste, foods such as toothpaste and wasabi,
A tube container in which pastes such as cosmetics, medicines, and quasi-drugs are to be filled, particularly excellent in preservability for contents containing fragrances, pigments, etc., and has a good texture due to flexibility and high quality. Provided is a laminated sheet for a tube container body, from which a tube container is obtained.

[0002]

2. Description of the Related Art An acrylic nitrile-based resin film is used as a laminated sheet for a tube container body for obtaining a tube container excellent in preservability for contents containing a fragrance, a dye, etc., from the front side to the back side. Surface layer consisting of, plastic film consisting of a printing substrate such as polyethylene terephthalate film, and aluminum foil,
A laminated sheet obtained by dry-laminating a back layer made of an acrylonitrile-based resin film, a surface layer made of an acrylonitrile-based resin film, a plastic film made of a printing substrate such as a polyethylene terephthalate film, and a silicon oxide vapor-deposited layer A laminated sheet obtained by dry laminating a polyethylene terephthalate film and a back layer made of an acrylonitrile-based resin film is used.

[0003]

In these laminated sheets for the tube container body, since the resin layer in contact with the contents is made of an acrylonitrile resin film, it absorbs highly permeable substances such as fragrances and dyes. It has no properties and has excellent preservability for contents containing fragrances, dyes, and the like.

However, the acrylonitrile-based resin film has a large rigidity and a hard and crisp feel, so that the tube container body feels like a water pipe made of a vinyl chloride resin. Must be thinner. Therefore, there is a disadvantage that a high-quality tube container having a certain thickness and a soft texture cannot be obtained.

The acrylic nitrile resin film used for the laminated sheet is hard and brittle, so that when the end seal portion of the tube container body is formed by an ultrasonic sealing method, the tube container may be used. The end of the seal portion of the acrylonitrile-based resin film forming the inner peripheral surface layer of the body is easily broken by impact, which causes leakage of the contents in the tube container.

Furthermore, the above laminated sheet has a low interlayer strength between the aluminum foil and the acrylonitrile-based resin film, which also leads to leakage of contents from the sealing portion.

On the other hand, according to the present invention, a flexible and good-textured tube container body can be obtained in spite of utilizing the non-adsorbing property of the fragrance and the dye etc. of the acrylonitrile-based resin film. Further, the present invention provides a laminated sheet for a tube container body, which does not cause cracks in an acrylonitrile-based resin film even when a seal portion is formed by an ultrasonic sealing method.

[0008]

According to the present invention, a surface layer composed of an acrylonitrile-based resin film, a plastic film composed of a printing substrate, a polyethylene resin and ethylene-methyl methacrylate are used from the front side to the rear side. A dry laminating layer obtained by dry laminating a film made of any resin selected from a polymer resin, an ethylene-vinyl alcohol copolymer resin, and an ethylene-vinyl acetate copolymer resin, and a film constituting the dry laminating layer And a laminated sheet for a tube container body having a laminated structure of an extruded resin layer made of the same resin as described above, a barrier layer, and a back layer made of an acrylonitrile-based resin film.

The laminated sheet for a tube container body of the present invention having the above-described structure is formed by punching and forming into a rectangular shape, and then a side seal portion is formed by heat sealing, and a back layer made of an acrylonitrile-based resin film in the laminated sheet is formed. It is formed into a cylindrical body to be an inner peripheral layer.

The surface layer made of the acrylonitrile-based resin film is heat-sealed with the acrylonitrile-based resin film forming the back surface layer at the side seal portion, and is formed to a thickness of about 30 to 100 μm. You.

As the plastic film composed of a printing substrate, a stretched polyethylene terephthalate film, a stretched polypropylene film, a stretched ethylene-vinyl alcohol copolymer resin film, a stretched nylon film, and the like are suitable, and a thin film can be used. Therefore, a stretched polyethylene terephthalate film is most preferable.

For a plastic film to be a printing substrate, any one selected from polyethylene resin, ethylene-methyl methacrylate copolymer resin, ethylene-vinyl alcohol copolymer resin, and ethylene-vinyl acetate copolymer resin is used. A film made of the resin is dry-laminated, and an extruded resin layer is further formed on the film with the same resin as the film.

The laminated sheet for the body of the tube container of the present invention is selected from polyethylene resin, ethylene-methyl methacrylate copolymer resin, ethylene-vinyl alcohol copolymer resin, and ethylene-vinyl acetate copolymer resin. The presence of a dry laminated layer obtained by dry laminating a film made of any one of the resins, and an extruded resin layer formed by extruding and laminating the same resin as the film constituting the dry laminated layer with respect to the film forming the dry laminated layer. , As a result of softening the texture,
A high-quality laminated sheet for tube container body.

A film made of any one of polyethylene resin, ethylene-methyl methacrylate copolymer resin, ethylene-vinyl alcohol copolymer resin, and ethylene-vinyl acetate copolymer resin is dry-laminated. The presence of a dry lamination layer and an extruded resin layer obtained by extruding and laminating the same resin as the film constituting the dry lamination layer on the film forming the dry lamination layer makes use of ultrasonic waves to form a seal portion. It has the function of absorbing the shock when it is performed.

Dry lamination in which a film made of any resin selected from polyethylene resin, ethylene-methyl methacrylate copolymer resin, ethylene-vinyl alcohol copolymer resin, and ethylene-vinyl acetate copolymer resin is dry-laminated. Layer, and a film forming the dry laminate layer, as an extruded resin layer obtained by extruding and laminating the same resin as the film constituting the dry laminate layer, particularly by using an ethylene-methyl methacrylate copolymer resin. Thus, it is possible to obtain a flexible laminated sheet for a tube container body having a better texture.

The extruded resin layer is formed, for example, at an extrusion temperature of about 290 to 320 ° C. for a polyethylene resin and about 250 to 300 ° C. for an ethylene-methyl methacrylate copolymer resin.

As the barrier layer, a metal foil such as an aluminum foil or a vapor-deposited film of an inorganic oxide is used.

As the inorganic oxide deposited film, for example, a monoaxially stretched film or a biaxially stretched film having a thickness of about 9 to 50 μm such as polyethylene terephthalate, polyethylene naphthalate, polyvinyl alcohol, nylon, polypropylene, etc. It is preferable to use a film in which a deposited layer of about 20 to 150 ° thick made of, for example, tin oxide, zinc oxide, indium oxide, titanium oxide, or aluminum oxide is formed by using vacuum deposition, sputtering, chemical vapor deposition, or the like.

In addition, as the vapor-deposited film of the inorganic oxide,
A silicon oxide vapor-deposited film is most preferable because high barrier properties can be obtained.

When an inorganic oxide vapor-deposited film is used as the barrier layer, the contents in the tube container are transparent enough to be seen through, and the used one is incinerated when incinerated. Since no residue is generated, it is suitable for environmental protection.

The back layer made of the acrylonitrile-based resin film is a surface in contact with the contents in the tube container,
It is formed to a thickness of about 30 to 100 μ. Since the back surface layer made of the acrylonitrile-based resin film does not have a property of adsorbing permeable substances such as fragrances and dyes, storage suitability for contents containing fragrances and dyes is obtained.

[0022]

The laminated sheet for a tube container body according to the present invention comprises, from the front side to the back side, a surface layer made of an acrylonitrile-based resin film, a plastic film made of a printing substrate, a polyethylene resin, ethylene-methyl A dry laminate layer obtained by dry laminating a film made of any resin selected from methacrylate copolymer resin, ethylene-vinyl alcohol copolymer resin, and ethylene-vinyl acetate copolymer resin, and the dry laminate layer And a laminated structure of an extruded resin layer made of the same resin as the film to be formed, a barrier layer, and a back layer made of an acrylonitrile resin film.

Thus, the laminated sheet for a tube container body according to the present invention utilizes a non-adsorptive property such as a fragrance and a dye by an acrylic nitrile-based resin film having a hard and crisp feeling, while using a polyethylene resin, A dry laminate layer obtained by dry laminating a film made of any resin selected from ethylene-methyl methacrylate copolymer resin, ethylene-vinyl alcohol copolymer resin, and ethylene-vinyl acetate copolymer resin; A flexible texture appears due to the presence of the film constituting the dry laminate layer and the extruded resin layer formed by extruding and laminating the same resin with respect to the film forming the layer.

Accordingly, the laminated sheet for a tube container body of the present invention has an extremely excellent effect on the preservability of contents containing fragrances and dyes, and gives a high-grade feeling due to a soft texture.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The concrete construction of the laminated sheet for a tube container body according to the present invention will be described based on examples.

Example 1 In FIG. 1, a surface layer 2 made of a 30 μm-thick acrylonitrile-based resin film, a printing substrate 3 having a 12 μm-thick biaxially stretched polyethylene terephthalate film printed thereon, Dry-laminated with a 30 μm ethylene-methyl methacrylate copolymer resin film 4,
A first laminated film was obtained.

On the other hand, an aluminum foil 5 having a thickness of 10 μm;
The back layer 6 made of an acrylic nitrile-based resin film having a thickness of 70 μm was dry-laminated to obtain a second laminated film.

Thereafter, the four faces of the ethylene-methyl methacrylate copolymer resin film of the first laminated film and the five faces of the aluminum foil of the second laminated film are combined with a 20 μm-thick ethylene-methyl methacrylate copolymer resin. Were laminated via a melt-extruded layer (extrusion temperature: 280 ° C.) 7 to obtain a laminated sheet for a tube container body indicated by reference numeral 1, which is a product of one embodiment of the present invention.

Example 2 In the manufacturing process of the laminated sheet for the tube container body of Example 1, a biaxially stretched polyethylene terephthalate film having a thickness of 12 μm and having a SiO _x evaporated layer was used in place of the aluminum foil. A laminated sheet for a tube container body, which is a product of one embodiment of the present invention, having the same configuration as the corresponding part of the laminated sheet for a tube container body of Example 1 was obtained.

Reference Example A blank plate obtained by punching out the laminated sheet for the tube body of each of the tubes obtained in Example 1 and Example 2 was used, and the side seal portion was set at 210 ° C. for 3 seconds. 3kg
/ Cm ² was formed by heat welding, and a cylindrical body serving as a tube main body having a diameter of 35 mm and a height of 150 mm was formed such that the back surface resin layer in the laminated sheet became the inner peripheral surface layer.

Next, the cylindrical body is mounted on a mandrel for forming a tube container, and a frustoconical shoulder portion and a continuous neck and neck portion are connected to one end of the cylindrical body by a conventional method. Was formed by injection molding of a polyethylene resin.

After the cylinder having the head is removed from the mandrel, 120 g of a commercially available toothpaste is filled in from the other open end of the cylinder, and the open end is further sealed with 21 g.
0 ° C., 3 sec. An end seal portion was formed by sealing by heat welding at 3 kg / cm ² to obtain an extruded tube container.

The obtained extruded tube container was rich in flexibility and had a good feel and high quality.

[0034]

According to the laminated sheet for the body of a tube container of the present invention, there is no adsorption of a substance having high permeability such as a fragrance and a coloring matter, and particularly, the preservability of contents containing these substances is excellent, and Extruded tube container with high quality due to its soft texture.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of a laminated sheet for a tube container body according to the present invention.

[Explanation of symbols]

1: Laminated sheet for tube container body 2: Surface layer made of acrylonitrile resin film 3: Printing substrate 4: Ethylene-methyl methacrylate copolymer resin film 5: Barrier layer 6: Acrylic nitrile resin film Backside layer 7: Melt extruded layer of ethylene-methyl methacrylate copolymer resin

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-1993045 (JP, A) JP-A-5-77355 (JP, A) JP-A-5-31855 (JP, A) 8352 (JP, A) JP-A-4-327143 (JP, A) JP-A-4-5043 (JP, A) JP-A-2-229038 (JP, A) JP-A-60-67150 (JP, A) (58) Field surveyed (Int.Cl. ⁷ , DB name) B32B 1/00-35/00 B65D 35/00-35/56

Claims (1)

(57) [Claims] 1. A surface layer composed of an acrylonitrile-based resin film, a plastic film composed of a printing substrate, a polyethylene resin, an ethylene-methyl methacrylate copolymer resin, and ethylene-vinyl alcohol. Copolymer resin, dry-laminated layer obtained by dry-laminating a film made of any resin selected from ethylene-vinyl acetate copolymer resin, and an extruded resin layer made of the same resin as the film constituting the dry-laminated layer And a laminate structure of a barrier layer and a back surface layer made of an acrylonitrile-based resin film.