JPH06171659A - Tubular container - Google Patents

Abstract

PURPOSE:To provide a tubular container which is suitable for packing the contents containing an aromatic ingredient, such as toothpaste or cosmetic, is excellent in aroma retention, water vapor barrier properties, transparency, and flexibility, and being inexpensive. CONSTITUTION:The body of the tubular container consists of an outside polyolefin resin layer 1, a biaxially oriented polyethylene terephthalate layer 3 and an inside polyolefin resin layer 5, which are stuck together in the same order. Alternatively, it consists of an outside polyolefin resin layer 1, a biaxially oriented polypropylene layer 6, adhesive layers 2 and 7, a biaxially oriented polyethylene terephthalate layer 3, and an inside polyolefin resin layer 5, which are stuck together in the same.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a low-priced tube container suitable for packaging of toothpaste, cosmetics, etc., which is excellent in aroma retention, water vapor barrier property, transparency and flexibility.

[0002]

2. Description of the Related Art Regarding a laminated tube container excellent in transparency, oxygen gas barrier property and aroma retention property, for example, an acrylonitrile resin film and an ethylene-vinyl alcohol copolymer film described in JP-B-2-45000 are used. A laminated film in which either a polyolefin resin film or a polyester film is laminated on both sides, between the first transparent resin film layer and the second transparent resin film layer described in Japanese Utility Model Publication No. 63-64638. There is known one having a structure in which a vapor deposition layer of an inorganic oxide is formed.

However, with respect to the former, as the gas barrier layer, an acrylonitrile resin film and ethylene-based resin film are used.
Since a two-layer laminated film with a vinyl alcohol copolymer film is used, there is a drawback that it is costly. In the latter one, the vapor deposition film of an inorganic oxide is expensive as in the former one, and the first transparent film is used. The vapor-deposited layer of the inorganic oxide between the resin film layer and the second transparent resin film layer has a drawback that cracks easily enter and the gas barrier property deteriorates.

[0004]

DISCLOSURE OF THE INVENTION The object of the present invention is to improve the above-mentioned drawbacks of the conventional tube container, and has an excellent aroma retaining property, water vapor barrier property, transparency and flexibility, and a fragrance component for toothpaste, cosmetics and the like. An object of the present invention is to provide an inexpensive tube container suitable for packaging contents including.

[0005]

A tube container is provided with a body portion having a structure in which an outer surface side polyolefin resin layer, a biaxially stretched polyethylene terephthalate layer, and an inner surface polyolefin resin layer are laminated in this order. .

In the above-mentioned tube container, a biaxially oriented polypropylene layer is provided between the outer surface side polyolefin resin layer and the biaxially oriented polyethylene terephthalate layer.

[0007]

[Function] By forming a barrier layer for preventing volatilization and migration of aroma components such as fragrance contained in the content to the outside by a biaxially oriented polyethylene terephthalate layer,
An inexpensive tube container excellent in aroma retention and flexibility can be obtained.

Further, the outer surface side polyolefin resin layer and 2
By providing a biaxially-stretched polypropylene layer having an excellent water vapor barrier property between the axially-stretched polyethylene terephthalate layers and forming the barrier layer as a two-layered structure of a biaxially-stretched polyethylene terephthalate layer and a biaxially-stretched polypropylene, a perfect aroma retaining property can be obtained. In addition to having, it is possible to completely prevent the evaporation of water in the contents to the outside.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. 1 and 2 are views showing a laminated structure of a body of a tube-shaped container of the present invention, wherein 1 is an outer surface side polyolefin resin layer, 2 is an adhesive layer, 3 is a biaxially stretched polyethylene terephthalate layer,
4 is an adhesive layer, 5 is an inner surface polyolefin resin layer, 6
Indicates a biaxially oriented polypropylene layer, and 7 indicates an adhesive layer.

As the outer surface polyolefin resin layer 1, low density polyethylene and linear low density polyethylene are suitable because surface strength and flexibility are required. When flexibility is required, the adhesive layer 2 is extruded polyethylene layer. It is good to say

In the tube container of the present invention, the biaxially stretched polyethylene terephthalate layer 3 in FIG.
The layer in which the biaxially stretched polypropylene layer 6 and the biaxially stretched polyethylene terephthalate layer 3 in 3 above function as a barrier layer. That is, the biaxially stretched polyethylene terephthalate layer 3 mainly prevents external migration and volatilization of aroma components in the contents, and the biaxially stretched polypropylene layer 6 mainly serves to prevent external moisture volatilization in the contents. Fulfill

Considering the aroma retaining property, water vapor barrier property, flexibility and cost of the tube container, it is 1 when the barrier layer is composed of 3 biaxially oriented polyethylene terephthalate layers.
A biaxially stretched polyethylene terephthalate film having a thickness of 2 to 16 μm, a barrier layer as a biaxially stretched polypropylene layer 6 and a biaxially stretched polyethylene terephthalate layer 3 are used.
When the two layers are laminated, it is appropriate that the biaxially oriented polyethylene terephthalate film has a thickness of 12 μm and the biaxially oriented polypropylene film has a thickness of 20 μm.

The adhesive layer 7 for laminating the biaxially-stretched polypropylene layer 6 and the biaxially-stretched polyethylene terephthalate layer 3 may be laminated with a urethane adhesive or extruded polyethylene, but it is necessary to have flexibility in the tube container. Lamination by extrusion of polyethylene is good, and it is relatively flexible when laminating with urethane adhesive 2
A liquid reaction type polyol component of polyether polyurethane polyol can be preferably used.

Biaxially stretched polyethylene terephthalate layer 3
The adhesive layer 4 for laminating the inner surface side polyolefin resin layer 5 is preferably extruded polyethylene, and the biaxially stretched polyethylene terephthalate layer 3 is preferably coated with a two-component curing type urethane anchor agent and extruded polyethylene. . By doing so, the flexibility of the tube container is improved, and the adhesive strength between the biaxially stretched polyethylene terephthalate layer 3 and the inner surface side polyolefin resin layer 5 due to the contents is not deteriorated with time.

Of course, the biaxially stretched polyethylene terephthalate layer 3, the inner surface polyolefin resin layer 5 and the urethane adhesive layer may be used for dry lamination, but in that case, flexibility and resistance to contents are preferable. It is preferable to use a two-component reaction type having excellent properties and a polyether polyurethane polyol as the polyol component.

As the inner surface side polyolefin resin layer 5, low density polyethylene and linear low density polyethylene are suitable because they have less adsorption of aroma components from the contents, but other ethylene-acrylic acid copolymers, ethylene- It does not matter if a polyolefin resin such as a methacrylic acid copolymer is used.

The thickness of the laminate constituting the barrel of the tube container varies depending on the application and is used in the range of 150 to 400 μm, but 200 to 300 μm is most suitable. Normally, the thicknesses of the outer surface polyolefin resin layer 1 and the inner surface polyolefin resin layer 5 are set to be substantially equal, but the aroma components in the contents are adsorbed to the inner surface polyolefin resin layer 5. In order to prevent the above, the thickness of the inner surface side polyolefin resin layer 5 is set to the minimum thickness that can maintain the physical strength of the tube container, for example, 30 to 70 microns, and the thickness of the outer surface polyolefin resin layer 1 is set to 2 It is also possible to set the thickness to twice or more.

In order to manufacture a tube container, the laminated body having the construction shown in FIG. 1 or 2 is overlapped with its end edges and welded to form a tube, and the end portion of the tube is made of polypropylene resin and the neck is made of polypropylene resin. Mold and mount to make a tube container.

Example 1 A bicomponent stretched polyethylene terephthalate film having a thickness of 12 μm was coated with a two-component curing type urethane-based anchoring agent, and a low-density polyethylene film having a thickness of 120 μm was laminated with a 20-μm extruded polyethylene, and 2 Similarly, the opposite surface of the axially stretched polyethylene terephthalate film is coated with a two-component curing type urethane-based anchoring agent, and a 20-micron extruded polyethylene film is laminated on the 120-micron low-density polyethylene film. Extruded polyethylene 20 / Anchor agent / Biaxially oriented polyethylene terephthalate 12 / Anchor agent / Extruded polyethylene 20 / Low density polyethylene 120
A tube member of a tube container was prepared, the tube member was formed into a tubular shape by heat welding, and a neck portion was formed at the end portion of the tubular body portion by polypropylene injection molding to give a tube container. The tube container had extremely good flexibility, and a tube container excellent in aroma retention and transparency was obtained. Water vapor permeability of the tube body is 0.9 g / m
^{It was 2}・ day.

Example 2 A biaxially oriented polypropylene film having a thickness of 20 microns and a biaxially oriented polyethylene terephthalate film having a thickness of 12 microns are laminated with a two-component reaction type urethane adhesive whose polyol component is polyether polyurethane polyol. Then, a two-component curing type urethane anchoring agent is applied to both surfaces of the laminate, and a 100 μm linear low-density polyethylene film is laminated with a 20-micron extruded polyethylene to obtain a linear low-density polyethylene 100 / Extruded polyethylene 20 / anchor agent / biaxially oriented polypropylene 2
0 / Urethane adhesive / Biaxially oriented polyethylene terephthalate 12 / Anchor / Linear low density polyethylene 10
A tube member of a tube container made of 0 was prepared, the tube member was formed into a tubular shape by heat welding, and the neck portion was formed at the end of the tubular body portion by polypropylene injection molding. A tube container having excellent properties, flexibility and transparency was produced.

[0021]

EFFECTS OF THE INVENTION A laminated structure comprising an outer surface side polyolefin resin layer 1, a biaxially stretched polyethylene terephthalate layer 3 and an inner surface side polyolefin resin layer 5, or an outer surface side polyolefin resin layer 1 and a biaxially oriented polypropylene layer 6
And an adhesive layer 7, a biaxially stretched polyethylene terephthalate layer 3, and a polyolefin resin layer 5 on the inner surface side, the tube container has a laminated body. Suitable for packaging,
An object of the present invention is to provide an inexpensive tube container excellent in aroma retention, water vapor barrier property, transparency and flexibility.

[Brief description of drawings]

FIG. 1 is a diagram showing a laminated structure of a body of a tube-shaped container of the present invention.

FIG. 2 is a diagram showing a laminated structure of a body portion according to another embodiment of the present invention.

[Explanation of symbols]

 1 Polyolefin resin layer on outer surface 2 Adhesive layer 3 Biaxially oriented polyethylene terephthalate layer 4 Adhesive layer 5 Polyolefin resin layer on inner surface 6 Biaxially oriented polypropylene layer 7 Adhesive layer

Claims (2)

[Claims] 1. A tube container comprising a body portion having an outer surface side polyolefin resin layer, a biaxially stretched polyethylene terephthalate layer, and an inner side polyolefin resin layer laminated in this order. 2. The tube container according to claim 1, wherein a biaxially oriented polypropylene layer is provided between the outer surface side polyolefin resin layer and the biaxially oriented polyethylene terephthalate layer.