JP3177749B2 - Laminated material for tube container body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated material formed on a body of a tube container.

[0002]

2. Description of the Related Art In order to enhance the preservation performance of a filling material in a tube container, a barrier layer which performs a barrier function against water vapor or gas is laminated on a laminated material formed in a tube container body. A laminated material using a metal foil of about 7 to 50 μm of aluminum or the like as a barrier layer is used.

By the way, a tube container having a tube container body made of a laminated material using a metal foil as a barrier layer is composed of a tube container body formed of a laminated material such as paper, a plastic layer, a metal foil, and the like. It is formed with a plastic head joined to the tip of the part, and it is difficult to separate and collect used tube containers for recycling. For this reason, at present, used tube containers are treated by incineration.

[0004]

However, when a used tube container having a container body made of a laminated material in which the above-mentioned metal foils are laminated is subjected to an incineration treatment, the laminated material used for the tube container body is removed. Metal foil remains as metal ash, which causes global pollution.

On the other hand, the present invention comprises a laminated material for a tube container body which has both barrier properties against gas and water vapor and flexibility, and also has resistance to breakthrough and stress cracking. The amount of metal ash remaining as residue when a used tube container is subjected to an incineration treatment is extremely low, and an easily incinerated laminate for a tube container body which does not pollute the earth is provided.

[0006]

SUMMARY OF THE INVENTION The present invention uses a biaxially stretched plastic film having an aluminum vapor-deposited layer in place of the conventional metal foil barrier layer, and uses a biaxially stretched plastic film having the aluminum vapor-deposited layer. By laminating a biaxially stretched plastic film surface and a resin layer for a heat sealant which forms an inner surface layer when formed into a tube container body through an extruded resin layer of an acid-modified polyethylene resin having a thickness of 30 to 60μ. ,
A laminated material for a tube container body having the above-described characteristics is provided.

That is, the laminated material for a tube container body of the present invention is such that the barrier layer made of a biaxially stretched plastic film having an aluminum vapor-deposited layer is such that the aluminum-deposited layer side is closer to the outer side of the tube container body. The biaxially stretched plastic film surface of the biaxially stretched plastic film having the aluminum vapor-deposited layer and the heat sealant resin layer serving as the inner surface layer have a thickness between them. It consists of a laminated material for a tube container body, which is laminated through an extruded resin layer of an acid-modified polyethylene resin of 30 to 60 μm and has no laminated metal foil in the laminated structure.

[0008] The barrier layer of the laminated material for a tube container body according to the present invention having the above-mentioned structure is, for example, a biaxially stretched plastic film having a thickness of about 9 to 50 µm made of polyethylene terephthalate film, polyamide film, polypropylene film or the like. A vapor-deposited film having an aluminum vapor-deposited layer of about 400 to 2000 ° is used. In addition, you may use the laminated sheet of two or more sheets of aluminum vapor deposition films as an aluminum vapor deposition film as a barrier layer.

In the biaxially stretched plastic film having the aluminum vapor-deposited layer, the acid-modified polyethylene resin layer interposed between the biaxially stretched plastic film surface and the heat sealant resin layer as the inner surface layer has a thickness of 30%.
It is made of an extruded resin layer having a thickness of 、 60 μm, whereby puncture resistance and stress crack resistance with respect to the tube container body laminate of the present invention can be obtained.

The resin layer for the heat sealant, which forms the inner surface layer, is a resin layer used for forming a sealed portion when the tube container body is formed from the laminated material for the tube container body of the present invention. Low density polyethylene, linear low density polyethylene, medium density polyethylene, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer,
It is formed to a thickness of about 30 to 150 μ with polypropylene, saturated polyester, polyacrylonitrile, or the like.
In addition, the resin layer that forms the outer surface layer of the tube container body,
If the resin layer for the heat sealant, which forms the inner surface layer of the tube container body, is formed of the same resin, the sealing strength between the outer surface layer and the inner surface layer when the tube container body is formed Becomes better. Further, it is needless to say that an antistatic agent can be applied to the resin layer constituting the outer surface layer or internally added as necessary.

The acid-modified polyethylene resin layer interposed between the barrier layer and the heat sealant resin layer serving as the inner surface layer is, for example, an ethylene / methacrylate copolymer, an ethylene / acrylic acid copolymer, an ethylene / acrylic acid copolymer. It is formed of a methacrylic acid copolymer, an ethylene / ethyl acrylate copolymer, an ethylene / methyl acrylate copolymer, an ionomer resin, or the like.

In the laminated material for a tube container body of the present invention having the above-described structure, a typical laminated structure of the laminated material is a resin layer for a heat sealant forming an outer surface layer / a support base material / Adhesive layer / barrier layer composed of a biaxially stretched plastic film having an aluminum evaporated layer /
An adhesive layer made of an acid-modified polyethylene resin / a resin layer for a heat sealant that forms an inner surface layer, or a resin layer for a heat sealant that forms an outer surface layer / a support base material / adhesive layer / for adjusting waist strength A layer composed of a film layer / adhesive layer / a barrier layer composed of a biaxially stretched plastic film having an aluminum vapor-deposited layer / an adhesive layer composed of an acid-modified polyethylene resin / a heat sealant resin layer constituting an inner surface layer is used.

[0013] The support base material in the laminated body for the tube container body is a part to be subjected to decorative processing such as printing.
A biaxially stretched polyethylene terephthalate film having a thickness of about 12 to 25 μ or paper having a basis weight of about 30 to 80 g / m ² is used. Further, a low-density polyethylene resin layer of about 15 to 30 μm is suitable for the adhesive layer.

The film layer for adjusting the waist strength is laminated to prevent air bag in the tube container. For example, low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, ethylene-acrylic acid copolymer is used. Union, ethylene-methacrylic acid copolymer, ethylene-
It is formed to a thickness of about 15 to 100 μm using an acid copolymer composed of an ethyl acrylate copolymer, an ethylene-methyl acrylate copolymer, or the like, a high-density polyethylene, or the like.

The laminated material for a tube container body of the present invention obtained by laminating the laminated members as described above can be obtained by extrusion laminating each laminated member, or by dry lamination using an adhesive, or , Can be easily obtained by a lamination method using both of them in combination.

[0016]

The laminated material for a tube container body of the present invention has a barrier layer made of a biaxially stretched plastic film having an aluminum vapor-deposited layer in such a state that the aluminum vapor-deposited layer side is close to the outer side of the tube container body. Laminated, the biaxially stretched plastic film surface of the biaxially stretched plastic film having the aluminum vapor-deposited layer, and a heat sealant resin layer serving as an inner surface layer,
Laminated between them through an extruded resin layer of an acid-modified polyethylene resin having a thickness of 30 to 60 μ,
Moreover, the laminated structure has no laminated metal foil.

Thus, the laminated material for a tube container body of the present invention having the above-mentioned structure uses a biaxially stretched plastic film having an aluminum vapor-deposited layer without using a barrier layer made of a metal foil. With this, the gas barrier property and water vapor barrier property required for the tube container are maintained, and the heat sealant forms the biaxially stretched plastic film surface of the biaxially stretched plastic film having the aluminum vapor deposition layer and the inner surface layer. Thickness 30-60 bonded to resin layer
Extrusion resistance and stress crack resistance are maintained by the presence of an extruded resin layer of an acid-modified polyethylene resin of μ.

In the laminated material for a tube container body according to the present invention, since the metal foil is not present in the laminated structure, when the used tube container is subjected to the incineration treatment, the metal ash is removed. Residue is extremely small,
It plays an excellent role in preserving the global environment.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The concrete constitution of the laminated material for a tube container body of the present invention will be described with reference to production examples.

Example 1 In FIG. 1, the thickness 1 having an aluminum vapor deposition layer
2μ biaxially stretched polyester film “Toyobo Co., Ltd.
: 3.07 g (dry) of urethane-based adhesive “Takeda Pharmaceutical Co., Ltd .: A515 / A12” on the polyester film surface subjected to corona discharge treatment in T7471 ”2
/ M ² of coating on the ratio, further biaxially stretched polyester film having a thickness of 12μ with another aluminum deposited layer on said surface "Toyobo (Ltd.): T7471" 3 deposited aluminum layer surface was laminated, and reference numeral 4 Was obtained as a barrier layer.

Using this barrier layer 4, a laminated material 1 for a tube container body, which is a product of one embodiment of the present invention, was obtained by the following procedure.

First, a support substrate 5 made of a biaxially stretched polyester film “Toyobo Co., Ltd .: E5200” having a thickness of 12 μm was subjected to decorative printing, and a urethane anchor coat was applied to one surface of the support substrate 5. Agent "Nippon Polyurethane Industry
Co., Ltd .: Coronate L ”at a rate of 5.0 g (dry) / m ² and a thickness of 7
0μ linear low-density polyethylene film
Co., Ltd .: Film layer 6 for adjusting waist strength consisting of SR3
To a 20 μm-thick low-density polyethylene extruded resin layer 7
Was laminated.

Subsequently, the surface of the linear low-density polyethylene film 6 for adjusting the waist strength and the surface of the aluminum vapor-deposited layer of the barrier layer 4 are interposed between the two with a 20 μm extruded resin layer 8 of low-density polyethylene interposed therebetween. And laminated.

Next, a urethane-based anchor coating agent "Nippon Polyurethane Industry Co., Ltd .: Coronate L" is applied to the polyester film surface of the barrier layer 4, and then a 40 μm thick acid-modified polyethylene resin layer 9 is applied to the applied surface.
"Mitsui Petrochemical Industry Co., Ltd .: AN4205" and thickness 60
A heat sealant resin layer 10 serving as an inner surface layer made of a low-density polyethylene resin layer having a thickness of μ was sequentially extruded and laminated.

Thereafter, an imine-based anchor coating agent “Nippon Shokubai Kagaku Co., Ltd .: P1000” is applied to the surface of the supporting substrate 5.
, And melt-extruded and laminated a low-density polyethylene resin “M11P: M11P” layer 25 having a thickness of 25 μm, followed by 0.15% by weight of an antistatic agent (Lion
Co., Ltd .: A resin layer 12 for a heat sealant which forms an outer surface layer having a thickness of 35 μm by an antistatic polyethylene resin “low density polyethylene (Mitsui Petrochemical Industry Co., Ltd .: M11P)” mixed with Armostat 513). Was also melt-extruded and laminated to obtain one example of the laminated material for a tube container trunk portion of the present invention denoted by reference numeral 1.

Comparative Example 1 Instead of the barrier layer 4 composed of a laminated sheet of biaxially stretched polyester films having a thickness of 12 μm and having an aluminum vapor-deposited layer, the laminated material 1 for the tube container body in Example 1 was replaced by A 10-μm-thick aluminum foil was used, and the other laminated structure was the same as the corresponding configuration of the tube-container-body-layered laminated material 1 to obtain a tube-container-body-laminated material for comparison.

[Experiment] The laminated material for each tube container body obtained in Example 1 and Comparative Example 1 was punched to obtain a blank plate for the tube container body. A cylindrical body having a diameter of 35 mm and a height of 150 mm, with the conductive polyethylene resin layer side being the outer peripheral surface side, was formed by overlapping and thermally bonding the left and right side portions of the blank plate.

Next, 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 head portion formed by a narrow neck and a continuous neck portion. Is formed by compression molding with a high-density polyethylene resin, filled with commercially available toothpaste, the tail end is sealed by heat welding, and a cap made of polypropylene resin is fitted on the head, ], An extruded tube container having a schematic shape as indicated by reference numeral 13 in 2 was obtained.

The obtained two types of extruded tube containers were
After storing for 6 months in an atmosphere of 0 ° C., the weight of each extruded tube container was weighed, and the state of delamination on the tube container body was observed. There was no outbreak.

When the two types of extruded tube containers obtained above were subjected to a burning test at 800 ° C. for 30 minutes, the incineration residue of the tube container with the laminated material of Example 1 was 3.65 g. The incineration residue of the tube container with the laminated material of the comparative example was 27.3 g.

[0031]

The laminated material for the tube container body of the present invention is
It has both barrier properties and flexibility against water vapor and gas, and also has resistance to puncture and stress cracking. The amount of metal ash that remains as a residue when this is performed is extremely low, which is suitable in terms of global environmental protection, and offers a great advantage of a tube container that is widely used as daily necessities.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing a laminated structure of an embodiment of a laminated material for a tube container body according to the present invention.

FIG. 2 is a front view showing a schematic shape of an extruded tube container having a container body formed of a laminated material according to Example 1 and Comparative Example 1.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Laminated material for tube container body parts 2, 3 Biaxially stretched polyester film having an aluminum vapor deposition layer 4 Barrier layer 5 Supporting substrate 6 Film layer for adjusting waist strength 9 Acid-modified polyethylene resin layer 10 Heat sealant forming inner surface layer Resin layer 12 for heat sealant forming outer surface layer 13 Extruded tube container

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP2-44738 (JP, U) Jiko 61-23396 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B32B 15/08 B32B 7/02 B65D 35/10 C23C 14/20

Claims (1)

(57) [Claims] 1. A barrier layer comprising a biaxially stretched plastic film having an aluminum vapor-deposited layer ,
The surface of the aluminum deposition layer constituting one barrier layer
And a biaxially stretched plastic forming the other barrier layer
It is composed of two layers, facing each other and facing each other.
A barrier layer comprising the two layers
Surface of the aluminum deposited layer constituting the found Ju - are stacked near becomes such a state outside side of the probe container body, or
Further, a heat-sealing resin layer serving as an inner surface layer is provided on the surface of the biaxially stretched plastic film constituting the barrier layer comprising the above two layers , and an acid-modified polyethylene resin layer is provided therebetween. Characterized in that the metal foil is not present in the laminated structure.