JPH05147668A - Mouth sealing material for squeezeable tube container - Google Patents

Abstract

PURPOSE:To provide a mouth sealing material which prevents a delamination phenomenon from generating even when a content in the tube container contains a highly permeable substance. CONSTITUTION:The title mouth sealing material is equipped with a first barrier layer 2 made of a metal thin film, a second barrier layer 4 made of a resin layer with an excellent barrier capability, and a sealant resin layer 5 which is heat-bonded to the mouth part of a tube container, from the front surface side to the rear surface side. The mouth sealing material 1 for a squeezeable tube container has a laminating constitution for which a solvent type adhesive is not applied from the second barrier layer 4 to the sealant resin layer 5 which forms the rear surface resin layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mouth sealing material for an extruded tube container in which a fluid-semi-fluid filling material is enclosed, and is particularly excellent when using a filling material containing a highly permeable substance. Provided is a mouth sealing material that exerts the above action.

[0002]

2. Description of the Related Art An extruded tube container in which a fluid-semi-fluid filling material is enclosed is formed by connecting a tubular container body whose lower end is closed and an upper end of the tubular container body. It has a conical trapezoidal shoulder and a head consisting of a neck and neck of a thin neck continuing from the shoulder, and a cap that is detachably engaged with the mouth and neck, and enhances the sealing property of the filling material. Therefore, a sealing material is attached to the tip of the mouth and neck.

The mouth sealing material used in this extruded tube container is usually a barrier property against the internal filler in the tube container, easily peelable from the mouth part of the tube container, and easy to handle as a sealing material. Waist is needed for, for example, from the front side to the back side,
A laminated sheet having a laminated structure of "synthetic resin film layer / metal foil / heat sealant resin layer for mouth / neck portion of tube container" is used. The layers between the layers of the laminated sheet are usually bonded by dry lamination using a urethane adhesive or the like.

[0004]

By the way, the above-mentioned mouth sealing material of the conventional tube container is obtained by laminating the respective laminated members of the mouth sealing material by a so-called dry laminating method using a solvent type adhesive. Therefore, for example, a filling material containing a highly permeable substance such as a fragrance, a mineral oil, a machine oil, a peppermint oil, an edible oil, an oil and fat, a spice, an organic polar solvent is stored in a tube container. Then, the highly permeable substance in the inner filler permeates the heat sealant resin layer forming the back surface resin layer of the mouth seal material, and the substance stays at the interface between the heat sealant resin layer and the metal foil. Then, the highly permeable substance staying at this interface weakens the adhesive action of the solvent-type adhesive between the heat sealant layer and the metal foil, and causes a delamination phenomenon in this portion. Therefore, when the consumer peels the sealing material from the mouth and neck when using the filling material in the extruded tube container, the sealing material peels at the interface between the heat sealant resin layer and the metal foil. Trouble occurs.

On the other hand, the present invention is directed to a mouth sealing material which is adhered to the mouth and neck of the tube container even when the filling material in the extruded tube container contains a highly permeable substance. (EN) Provided is a mouth sealing material that does not cause a delamination phenomenon.

[0006]

Means for Solving the Problems The mouth sealing material of an extruded tube container of the present invention is, from the front surface side to the back surface side,
A first barrier layer consisting of a thin metal layer and 20.0 g
/ M ² · 24hr (40 ° C, 90% RH) Water vapor permeability below 20.0cc / m ² · 24hr (1 atm, 2
Laminate having a second barrier layer composed of a resin layer satisfying at least one of oxygen permeability of 0 ° C. and dry) or less, and a sealant resin layer heat-bonded to the mouth and neck of the extruded tube container. It consists of sheets,
In addition, the above-mentioned problems are solved by using a laminated sheet in which a solvent-type adhesive or anchor coating agent is not applied between the second barrier layer and the sealant resin layer.

In the mouth portion sealing material of the extruded tube container according to the present invention having the above-mentioned structure, the first thin film layer of metal
The barrier layer of aluminum, aluminum alloy,
A metal foil having a thickness of about 5 to 100 μ and made of copper, iron or the like is used.

The second barrier layer prevents the highly permeable substance in the tube container from reaching the metal thin film layer even when the highly permeable substance penetrates the sealant resin layer. / M ² · 24hr (40 ° C, 90%
RH) or less water vapor permeability and 20.0cc / m ² · 24
It is composed of a resin layer satisfying at least one of oxygen permeability of not more than hr (1 atm, 20 ° C., dry). A multi-layer coextrusion resin film is usually used for the second barrier layer, and mainly, saturated polyester resin, nylon resin, ethylene-vinyl alcohol copolymer resin, propylene resin, linear low density polyethylene resin, polyethylene resin, Thickness 10 to 10 that combines medium density polyethylene resin, high density polyethylene resin, etc.
A multilayer coextruded resin film of about 0 μ, for example, “ethylene-vinyl alcohol copolymer / polypropylene”,
"Polypropylene / ethylene-vinyl alcohol copolymer / polypropylene", "nylon / ethylene-vinyl alcohol copolymer / nylon / linear low-density polyethylene", "linear low-density polyethylene / nylon / linear low-density polyethylene", etc. The multi-layered film according to 1. is used with the polyolefin resin layer side of these multi-layered films facing the sealant resin layer side.

The sealant resin layer that is heat-bonded to the mouth of the tube container serves as the back surface resin layer of the mouth seal material. When the mouth seal material is a complete seal type,
The same resin as that used for the mouth and neck of the tube container, for example, linear low density polyethylene resin, high density polyethylene resin, polypropylene resin, ethylene-vinyl alcohol copolymer resin, saturated polyester resin, etc. When the mouth sealing material is made to be an easily peelable type, an ethylene-vinyl acetate copolymer resin, a polypropylene resin and a linear low density polyethylene mixed with an ethylene / α-olefin copolymer (for example, Toughmer [trade name]) are mixed. Formed to a thickness of about 10 to 60 μm with a resin mixed with resin, and further with a resin such as polypropylene resin, ethylene-vinyl acetate copolymer resin, linear low density polyethylene resin, etc., to which a tackifier is added. To be done.

In the mouth sealing material of the extruded tube container of the present invention, when the mouth sealing material is of an easily peelable type, in order to maintain the strength required when peeling the sealing material, a metal is used. First barrier layer consisting of a thin film layer of 20.0g / m ² · 24hr (40 ° C, 90% R
H) or less water vapor permeability and 20.0 cc / m ² · 24h
Biaxial stretching having a thickness of about 10 to 30 μ with a second barrier layer made of a resin layer satisfying at least one of oxygen permeability of r (1 atm, 20 ° C., dry) or less. A supporting substrate made of a nylon film, a biaxially stretched polyester film, or the like is laminated.

Further, by laminating a heat resistant resin layer such as a biaxially stretched nylon film or a biaxially stretched polyester film having a thickness of about 10 to 30 μ on the surface of the first barrier layer composed of a metal thin film layer, The mouth seal material can have excellent heat resistance and pinhole resistance. Furthermore, as the surface resin layer of the mouth sealing material, a heat-sealable resin layer that is heat-welded with the inner peripheral surface of the cap, for example, ethylene-vinyl acetate copolymer resin, chlorinated polypropylene resin, polyester By forming a resin layer of a system resin or the like, a so-called inner seal material for sealing the mouth of the container can be obtained.

In the mouth sealing material of the extruded tube container of the present invention, for example, an extrusion laminating method of a polyolefin resin or a urethane adhesive is provided between the respective layers between the second barrier layer and the surface side. Although it may be adhered by any of the dry laminating methods used, solvent-type adhesive (solvent-type anchor) is used for adhering each layer from the second barrier layer to the sealant resin layer forming the back surface resin layer. The application of coatings should be avoided. Therefore, for the adhesion between the layers during this time, the extrusion lamination method using a heat-welding resin is applied. For adhesion between the second barrier layer and the sealant resin layer, a thermoplastic resin similar to the polyolefin resin layer forming the back surface layer of the second barrier layer, such as polypropylene, linear low density polyethylene, or low Density polyethylene, ethylene-vinyl acetate copolymer, ethylene-methacrylic acid copolymer, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylate copolymer, ionomer, etc. Thickness 15- It is preferable to use a melt extruded resin layer having a thickness of about 60 μm.

[0013]

The mouth sealing material for a tube container according to the present invention is 20.0 g / m ² · forming a second barrier layer in a laminated sheet.
Water vapor permeability below 24 hr (40 ° C, 90% RH) and 20.0 cc / m ² · 24 hr (1 atm, 20 ° C, d
ry) A solvent type adhesive (solvent type anchor coat) between the resin layer satisfying at least one of the following oxygen permeability and the sealant resin layer forming the back surface resin layer of the laminated sheet. Since the agent) is not applied, even if a highly permeable substance is contained in the filling in the tube container, the highly permeable substance is present due to the presence of the second barrier layer. Does not penetrate, and the interface of the laminated member forming the seal material does not peel off.

That is, the mouth-sealing material for a tube container of the present invention, in particular, even if the tube container is filled with an internal filler containing a highly permeable substance, the highly permeable substance is of a solvent type. Since the adhesive stays between the second barrier layer to which the adhesive is not applied and the back surface resin layer, the delamination phenomenon does not occur between the laminated members forming the mouth seal material. ..

[0015]

EXAMPLES The concrete constitution of the mouth portion sealing material of the tube container of the present invention will be explained with reference to production examples.

Example 1 In FIG. 1, 6 g of urethane adhesive "A515 / A50: Takeda Yakuhin Co., Ltd." was applied to the back surface of the first barrier layer 2 made of a soft aluminum foil having a thickness of 50 μm. m ²
On the surface of the urethane adhesive after applying
A supporting base material 3 made of a 2 μ biaxially stretched polyester film “E5200: Toyobo Co., Ltd.” is adhered, and subsequently, the supporting base material 3 and “nylon / ethylene-vinyl alcohol copolymer / nylon / linear”. Second barrier layer 4 made of low-density polyethylene "four-layer coextruded laminated film 45 µm thick" Gunze: PHL film "
The surface of the nylon resin layer was laminated with a urethane adhesive.

Then, the linear low density polyethylene resin layer surface of the second barrier layer 4 and an easily peelable film "VMX XB15" having a thickness of 30 .mu.m made of a mixed resin of ethylene-vinyl acetate copolymer, polypropylene and polystyrene.
FT: Mitsubishi Petrochemical Co., Ltd. "and a sealant resin layer 5 and a low-density polyethylene resin" M11P: Mitsui Petrochemical Industry Co., Ltd. "layer 6 having a thickness of 20 μ is melt-extruded between them. By laminating, a laminated sheet was obtained as a material for molding the mouth sealing material. Thereafter, the molding material was punched and molded to obtain Example 1 of the mouth sealing material for the extruded tube container of the present invention.

The second barrier layer 4 used in the mouth sealing material 1 is made of "nylon / ethylene-vinyl alcohol copolymer / nylon / linear low-density polyethylene" having a four-layer structure and a thickness of 45 μm. The water vapor permeability of the extruded film is 10.0 g / m ² · 24 hr (40 ° C, 90%
RH) and the oxygen permeability is 4.0 cc / m ² · 24h
r (1 atm, 20 ° C., dry).

Comparative Example 1 A first barrier layer 2 made of a soft aluminum foil having a thickness of 50 μ used in Example 1 and a support base formed by a biaxially stretched polyester film “E5200: Toyobo Co., Ltd.” having a thickness of 12 μ. Material 3 and an easily peelable film “V” having a thickness of 30 μ
MXXB15FT: Mitsubishi Petrochemical Co., Ltd. "and a sealant resin layer 5 are laminated using a 6 g / m ² urethane adhesive" A515 / A50: Takeda Yakuhin Co., Ltd. " After obtaining a laminated sheet as a molding material of the sealing material, by punching the molding material,
For the purpose of comparison, an extruded tube container mouth sealing material was obtained.

[Experiment] In the production of a laminated sheet for forming a body of a tube container [FIG. 2], corona discharge treatment of a support substrate 12 made of a biaxially stretched polyester film having a thickness of 12 μ and having one side subjected to corona discharge treatment. For the biaxially stretched polyester film 1 after the cosmetic processing 13 by printing
A soft aluminum foil 15 having a thickness of 15 μm was laminated on the surface 13 of the decorative treatment 2 of No. 2 through an extruded resin layer 14 of a 25 μm thick acid-modified polyolefin resin “N1108C: Mitsui Petrochemical Industry Co., Ltd.”.

Next, a linear low density polyethylene A / nylon B /
Linear low density polyethylene C 3 layer thickness 5
A 0 μ extruded film “BGL: Gunze Co., Ltd.” film 16 was formed between the soft aluminum foil 15 and a thickness of 3 μm.
0 μ of acid-modified polyolefin resin [N1108C: Mitsui Petrochemical Industry Co., Ltd.] is laminated via an extruded resin layer 17, and then a low density polyethylene resin is extruded and laminated to form a back resin layer having a thickness of 60 μ. 18 was formed.

After that, a urethane anchor coating agent (506X /
After roll-coating CAT10), a low-density polyethylene resin layer having a thickness of 60 μm is extruded and laminated on the surface of the anchor coating agent to form a surface resin layer 19, and a laminated sheet 11 for forming a body of a tube container is formed. Got

Manufacture of Extruded Tube Container After punching the laminated sheet 11 for forming the body of the tube container to obtain a blank plate for the body of the tube container,
By overlapping the left and right side portions of the blank plate with each other and bonding them by heat, the back surface resin layer of each blank plate is a container inner peripheral surface layer having a diameter of 35 mm and a height of 150 mm.
Was molded into a cylindrical body.

Then, the cylindrical body is mounted on a mandrel for molding a tube container, and in FIG. 3, one end of the cylindrical body 32 is provided with a truncated cone-shaped shoulder portion 33 and a thin portion continuous with the shoulder portion 33. After molding a head portion 35 composed of the neck and neck portion 34 by injection molding using high density polyethylene resin,
Each mouth sealing material 36 obtained in the above-mentioned Example 1 and Comparative Example 1 was attached to each tip sealing material 36 with respect to the tip of the mouth / neck portion 34.
By thermally adhering the sealant resin layer 5 and the mouth / neck portion 34 in (1) to (3), the tube container precursor indicated by reference numeral 31 was obtained.

Then, 65% peppermint oil 5 is supplied from the open portion at the tail end of the cylindrical body 32 forming the body of the tube container precursor 31.
0 cc was filled and the tail end was sealed by heat welding to obtain a tube container.

Storage of Extruded Tube Container After the cap was engaged with the obtained tube container, the cap was stored in an inverted state at 40 ° C. No abnormality occurred even after a lapse of days, but the mouth seal material of Comparative Example 1 had 5
A delamination phenomenon occurred between the supporting base material and the sealant resin layer during storage for one day.

[0027]

INDUSTRIAL APPLICABILITY The mouth sealing material for an extruded tube container of the present invention has an extremely excellent barrier performance due to a thin metal film layer, and when a highly permeable inner filler is enclosed in the tube container. Also, in the case where the delamination phenomenon does not occur between the laminated members of the mouth seal material, and when the seal material is peeled from the mouth when using the inner filler in the tube container, the seal material is a heat sealant layer and a metal. There is no trouble of peeling at the interface with the foil.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an example of a mouth sealing material of an extruded tube container of the present invention.

FIG. 2 is a schematic sectional view showing an example of a laminated sheet for forming a body of an extruded tube container.

FIG. 3 is a cross-sectional view of a main part of a precursor of an extruded tube container for explaining a mouth / neck portion of the extruded tube container and a mouth sealing material adhered to the mouth / neck portion.

[Explanation of symbols]

 1 Sealing Material for Mouth of Extruded Tube Container 2 First Barrier Layer Made of Soft Aluminum Foil 3 Supporting Base Made of Biaxially Stretched Polyester Film 4 Second Barrier Layer 5 Sealant Resin Layer

Claims (1)

[Claims] 1. A first barrier layer comprising a metal thin film layer and 20.0 g / m 2 from the front surface side to the back surface side.
^{2 · 24hr (40 ℃, 90} % RH) or less of water vapor permeability and ^{20.0cc / m 2 · 24hr (1atm} , 20
A second barrier layer comprising a resin layer satisfying at least one of oxygen permeability of ℃ and dry) or less;
It is composed of a laminated sheet having a sealant resin layer that is heat-bonded to the mouth of the extruded tube container, and that no solvent type adhesive is applied between the second barrier layer and the sealant resin layer. Characteristic sealing material for extruded tube containers.