JPH1149245A - Wet tissue packaging body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep a capability which is equivalent to a conventional method, keep the cost low, and make it commercially usable sufficiently by performing a seal-packaging with a laminated packaging material of a specified steam permeability, with a constitution having no aluminum layer. SOLUTION: Polyethylene terephthalate of a thickness of 12 μm is made to be base material, and on the rear surface, a deposited layer comprising aluminum oxide of a film thickness of 400 Å, is formed, and a coating liquid is coated by a bar-coater,The oxygen permeability is 0.3 cc/m<2> . day. atm measured by a MOCON method, and the steam permeability is 1.2g /m<2> . day measured by the MOCON method. By using a laminated packaging material, a wet tissue containing 60-70% of an alcohol content, is filled and sealed in a gusset bag, and after being stored for two months, the alcohol content can be kept under the same state. Therefore, though the thickenss of the deposited layer is thin, yet by having the oxygen permeability of 2.0 cc/m<2> .day.atm or lower, and the steam permeability of 2.0 g/m<2> .day or lower, a high barrier property can be maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet tissue package using a laminated packaging material which is suitable for hermetically packaging a wet tissue containing water and alcohol and which is easy to dispose after use.

[0002]

2. Description of the Related Art Wet tissue containing alcohol has been sold in a sealed package using a laminated packaging material having excellent moisture resistance and chemical resistance. As a general configuration of the laminated packaging material, for example, a plastic film / adhesive resin layer / aluminum foil / sealant layer has been used. Here, by using an aluminum foil in the middle, the moisture-proof property was 1 g / m ² · day or less, the light-shielding property was excellent, and the preservability of the wet tissue was good.

However, the aluminum foil used in the middle is
In order to require a thickness of 7 μm or more, after using the wet tissue as a content, the laminated packaging material having the above-described configuration is used.
When the incineration treatment is performed, a residue is generated, and there is a problem in the treatment.

On the other hand, as a barrier material in place of the aluminum foil of the laminated packaging material, for example, an ethylene-vinyl alcohol copolymer, polyvinylidene chloride, a plastic film coated with polyvinylidene chloride, etc. can be mentioned. Was not adopted due to insufficient training.

[0005] In addition to the plastic film, a vapor-deposited film obtained by vapor-depositing a metal oxide on a plastic film has attracted attention as the barrier film.
However, this vapor-deposited film also has a moisture-proof property of 3 g / m ² · da.
It was about y, and the moisture-proof property was insufficient for wet tissue packaging.

[0006]

SUMMARY OF THE INVENTION The present invention uses a vapor-deposited film on which a metal oxide is vapor-deposited and has a moisture-proof property of 2 g.
/ M ² · day or less, preferably 1 g / m ² · day or less, which is effective, retains the same performance as conventional aluminum foil, does not increase cost, and can be used commercially sufficiently. It is intended to provide a package using the material.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a laminated packaging material comprising a wet tissue having an aluminum layer having a water vapor transmission rate of 2 g / m ² · day or less, preferably 1 g / m ² · day or less. This is a wet tissue package that is hermetically sealed.

According to a second aspect of the present invention, in the laminated packaging material, a metal oxide vapor deposition layer is provided on a substrate, and a coating layer containing a water-soluble polymer and a metal alkoxide or a hydrolyzate thereof is provided on the vapor deposition layer surface. It is a wet tissue package having a configuration provided with a barrier film and a sealant layer.

A third invention is a wet tissue package in which an intervening film is provided between the barrier film and the sealant layer. A fourth invention is a wet tissue package in which an anchor coat layer is provided on the side of a vapor deposition layer of the base material.

A fifth invention is a wet tissue package wherein the alcohol content of the wet tissue is 60 to 70%.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view for explaining the structure of a laminated packaging material used for a package of the present invention. In FIG. 1, 2 is a substrate, 3 is a metal oxide deposited layer, 4 is a coating layer,
5 is a packaging material having a laminated structure of a sealant layer. FIG.
Is a packaging material provided with an intervening film 6 between the coating layer 4 and the sealant layer 5 in FIG.

As shown in FIG. 3, a package 10 sealed and packaged in a gusset bag using the packaging material shown in FIG.
It is.

The substrate 2 is in the form of a sheet or a film, and is made of polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon- 6
6), polyvinyl chloride, polyimide, etc., or copolymers of these polymers, etc., plastic films or sheets usually used as packaging materials can be used.

Known additives such as an antistatic agent, an ultraviolet absorber, a plasticizer, a lubricant, and a coloring agent can be added to the base material, and they are added as needed. Further, it is more effective to improve the adhesion of the vapor-deposited layer by providing a polyester-based, acrylic-based, or urethane-based anchor coat layer on the surface (vapor-deposited surface) of the substrate and performing surface modification.

The metal oxide deposited layer 3 is made of an oxide, nitride, or the like of silicon, aluminum, titanium, zirconium, tin, or the like.
It is composed of a simple substance of fluoride or a composite thereof, and is formed by a vacuum deposition method, a sputtering method, a plasma vapor deposition method (CV).
D method) or the like. The thickness of the metal oxide deposited layer 3 is preferably in the range of 100 to 800 °.

The coating layer 4 is mainly composed of an aqueous solution containing a water-soluble polymer and at least one of (a) one or more metal alkoxides and hydrolysates thereof, and (b) tin chloride, or a mixed solution of water / alcohol. And a coating agent. A water-soluble polymer and tin chloride are converted to an aqueous system (water or water /
A mixture of a solution dissolved in a solvent) or a solution obtained by directly treating the metal alkoxide or a treatment in which the metal alkoxide is hydrolyzed is coated on the inorganic compound vapor deposition layer 3 on the plastic substrate 2. It is formed by heating and drying. Each component contained in the coating agent will be described in detail below.

The water-soluble polymer used for the coating agent in the present invention includes polyvinyl alcohol, polyvinylpyrrolidone, starch, methylcellulose, carboxymethylcellulose, sodium alginate and the like. In particular, when polyvinyl alcohol (PVA) is used as the coating agent for the gas barrier laminate of the present invention, the gas barrier properties are most excellent. The PVA referred to here is generally obtained by saponifying polyvinyl acetate, and ranges from so-called partially saponified PVA in which tens of percent of acetic acid groups remain to fully saponified PVA in which only a few percent of acetic acid groups remain. Including
There is no particular limitation.

Further, the metal alkoxide is represented by a general formula such as tetraethoxysilane [Si (OC ₂ H ₅ ) ₄ ], triisopropoxy aluminum [Al (O-2′-C ₃ H ₇ ) ₃ ], M (OR) _n (M: metal such as Si, Ti, Ai, Zr, R: CH ₃ ,
(An alkyl group such as C ₂ H ₅ ). Among them, tetraethoxysilane and triisopropoxyaluminum are preferable because they are relatively stable in an aqueous solvent after hydrolysis.

Each of the above-mentioned components can be added to the coating agent alone or in combination of several components. Further, as long as the barrier properties of the coating agent are not impaired, isocyanate compounds, silane coupling agents, dispersants, and stabilizers Known additives such as a viscosity modifier and a colorant can be added.

For example, an isocyanate compound added to a coating agent has two or more isocyanate groups (NCO groups) in its molecule, such as tolylene diisocyanate (TDI), triphenylmethane triisocyanate (TTI), There are monomers such as tetramethylxylene diisocyanate (TMXDI), and polymers and derivatives thereof.

As a method for applying the coating agent, conventionally known means such as a dipping method, a roll coating method, a screen printing method, and a spraying method are used. Although the thickness of the film varies depending on the type of the coating agent, the thickness after drying may be in the range of about 0.01 to 100 μm. It is desirable that the thickness be 50 μm.

The sealant layer 5 can be used according to the purpose as long as it is a resin having heat sealing properties, such as polyethylene, polypropylene, and ethylene copolymer. Among them, linear low-density polyethylene is preferable from the viewpoint of heat sealability and chemical resistance. This sealant layer may be provided by laminating a filmed material via an adhesive, or may be laminated by directly extruding and coating a molten resin. Then, the sealant layer is made of a nonionic surfactant of 500 to 3000 pp.
m, preferably, a resin layer to which 700 to 2000 ppm is added, or a resin layer to which a surfactant is added may be provided via a resin layer to which no surfactant is added so as to be the innermost layer. The intervening film 6 is made of PET, N
Stretched films of y and PP are suitable. In particular, in the case of a wet tissue having a high alcohol content of 60 to 70%, it is effective to provide the intervening film 6.

The shape of the package may be a pillow package, a four-side seal bag, a three-side seal bag, a gusset-like bag, a standing pouch, etc., with the heat-sealing resin layer of the laminated packaging material as an inner surface, other than the square bottom shape. It can be used after being formed into a container.

The present invention is applicable to a case where the thickness of the deposited layer is small.
And oxygen permeability of 2.0cc / m ^Two・ Day ・ atm
Hereinafter, the water vapor permeability is set to 2.0 g / m^Two・ Water less than day
High barrier property called vapor permeability can be maintained
Was. In addition, the sealer is not directly on the
When a heat seal layer is formed,
In addition, the evaporation layer is protected by the coating layer,
The bottom is small, high gas barrier properties and moisture proofness are maintained.
In addition, a laminated material having excellent content resistance can be obtained.

Example 1 A polyethylene terephthalate (PET) having a thickness of 12 μm was used as a base material, and a film thickness of 4
Then, a coating layer having the following composition was applied by a bar coater, and dried at 120 ° C. for 1 minute with a drier to obtain a thickness of about 0.5 mm.
A μm coating layer was formed. Next, an intervening film made of a polyethylene terephthalate film was laminated on the coating layer of the base material via an adhesive.

9. Component of coating liquid for coating layer Tetraethoxysilane [Si (OC ₂ H ₅ ) ₄ ]
89.6 g of hydrochloric acid (0.1 N) was added to 4 g, and the mixture was stirred for 30 minutes and hydrolyzed to obtain a hydrolysis solution (A) having a solid content of 3 wt% (in terms of SiO ₂ ), and a polyvinyl alcohol of 3.0%.
A composition obtained by mixing a wt% water / isopropyl alcohol (90/10) solution (B).

Further, a 50 μm linear low-density polyethylene film was laminated on the intervening film via an adhesive to form a sealant layer.

Then, the oxygen permeability and the water vapor permeability of the obtained laminated material were measured. Oxygen permeability was measured by the Mocon method and was measured at 0.3 cc / m ² · day · atm (30 ° C, 7 ° C).
0% RH), and the water vapor transmission rate was measured by the Mocon method, and was 1.2 g / m ² · day (40 ° C., 90% RH).
H). Using this laminated packaging material, a wet tissue containing an alcohol content of 60 to 70% is filled and sealed in a gusset bag shown in FIG. 3 and stored for two months. As a result, the alcohol content of the wet tissue can be kept as it is. Was. In addition, no delamination occurred in the laminated material.

Example 2 A laminated packaging material having the same structure as in Example 1 except that the metal oxide vapor-deposited layer was replaced with silicon oxide was obtained. Then, the oxygen permeability and the water vapor permeability of the obtained laminated material were measured. Oxygen permeability was measured by the Mocon method, and was 0.1 cc / m ² · day · atm (30 ° C., 70%
RH), and the water vapor permeability is measured by a Mocon method, and is 1.0 g / m ² · day (40 ° C., 90% RH);
Met. Using this laminated packaging material, a wet tissue containing 60 to 70% of water and alcohol is filled in a gusset bag shown in FIG. 3 and sealed, and stored for 2 months. As a result, the alcohol content of the wet tissue is kept as it is. Was completed.

[0030]

According to the present invention having the above constitution, the water vapor permeability can maintain the barrier property of 2.0 g / m ² · day or less and the moisture proof property is excellent. Even if the wet tissue containing the alcohol is filled and packaged and stored, the state can be maintained as it is without dissipating the alcohol. In addition, delamination does not occur in the laminated material due to the high concentration of alcohol.

Further, even if the bag is incinerated, there is no residue and no toxic gas is generated, so that the treatment after use of the wet tissue is facilitated.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a laminated packaging material used for a package of the present invention.

FIG. 2 is a sectional view showing another embodiment of the laminated packaging material used for the package of the present invention.

FIG. 3 is an explanatory view showing one embodiment of the package of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Exterior material 2 ... Base material 3 ... Metal oxide vapor deposition layer 4 ... Coating layer 5 ... Sealant layer

Claims (5)

[Claims] 1. A wet tissue having a water vapor transmission rate of 2
g / m ² · day or less, preferably, 1g / m ² · da
A wet tissue package hermetically packed with a laminated packaging material having no aluminum layer of y or less. 2. A barrier film in which a laminated packaging material is provided with a metal oxide vapor-deposited layer on a substrate and a coating layer containing a water-soluble polymer and a metal alkoxide or a hydrolyzate thereof on the surface of the vapor-deposited layer, and a sealant layer. The wet tissue package according to claim 1, wherein the package is provided. 3. The wet tissue package according to claim 2, wherein an intervening film is provided between the barrier film and the sealant layer. 4. The wet tissue package according to claim 1, wherein an anchor coat layer is provided on the side of the substrate on which the vapor deposition layer is provided. 5. The wet tissue having an alcohol content of 60.
The wet tissue package according to any one of claims 1 to 4, wherein the amount is from about 70% to about 70%.