JPH08198341A - Pouch having heat resistance and water resistance - Google Patents

Abstract

PURPOSE: To obtain a heat-resistant and water-resistant pouch used for sterilization by boiling in which a water-resistant layer Iaminated on the surface of the pouch prevents boiled water (steam) from intruding into the pouch to prevent an adhesive layer as an inner layer of the pouch from being deteriorated by steam and delaminated. CONSTITUTION: A film for a wrapping material provided with a sealant layer 3 on one surface of a substrate layer 2 mainly composed of a biaxially oriented polyamide film mainly composed of a biaxially oriented polyamide film with water-resistant layers 5, 6 provided on both surfaces thereof is made into a bag.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat resistant and water resistant pouch having a heat resistant property and a water resistant property, which is formed by using a packaging film mainly composed of a polyamide film or a sheet. .

[0002]

2. Description of the Related Art Generally, boiling pouches for boiling sterilization are made by using a film for boil sterilization packaging.

As shown in FIG. 3, a conventionally used film 11 for boil sterilization packaging has water resistance on one surface of a biaxially stretched polyamide resin film layer 14 (or sheet) having low water resistance. A base material layer 12 coated with a resin and provided with a water resistant layer 15, and a sealant made of a non-stretched polypropylene resin laminated (dry laminated) on the base material layer 12 via an adhesive layer 18 provided on the water resistant layer 15 side. And the layer 13.

When a pouch for sterilizing a boil is made into a bag by using the film 11 for the sterilizing packaging material for boil, two wrapping films 11 are stacked and the periphery thereof is heat-sealed. It has been made into bags.

[0005]

The film for packaging material 1 described above
The conventional pouch made by using No. 1 has low water resistance under boiling conditions of 95 ° C., air content (air content) of 50 cc or more, and boiling time of 20 minutes or more as boiling conditions when the pouch is used. Biaxially stretched polyamide resin film layer 1
4 swells with water, and moisture penetrates into the water resistant layer 15 on the inner surface of the pouch.

[0006] A large amount of water vapor (moisture) that has penetrated into the polyamide resin layer 14 to the water resistant layer 15 causes
Of the biaxially stretched polyamide resin film layer 14 and the water resistant layer 15 are made unstable.

Further, a large amount of water vapor (moisture) that has penetrated into the water resistant layer 15 reduces the water resistance of the water resistant layer 15 and reduces the adhesiveness of the adhesive layer 18, so that the sealant layer 13 and the water resistant layer 15 are combined. In some cases, delamination (delamination) may occur between the biaxially stretched polyamide resin film layer 14 and the water resistant layer 15, and due to this delamination, stress such as gas expansion inside the pouch during boiling breaks the bag. It often happened.

According to the present invention, boiling water (water vapor) is prevented from entering the inner layer from the surface of the pouch, so that delamination of the inner surface of the pouch due to water vapor is avoided and a pouch having heat resistance and water resistance is obtained. Especially.

[0009]

DISCLOSURE OF THE INVENTION The present invention provides a packaging film having a sealant layer 3 on one surface of a base material layer 2 mainly composed of a biaxially stretched polyamide film or sheet having water resistant layers 5 and 6 on both surfaces. A pouch having heat resistance and water resistance, which is characterized in that it is formed into a bag using.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The heat and water resistant pouch of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a side sectional view of the pouch A of the present invention. Heat resistance formed by laminating (dry laminating) a sealant layer 3 made of a non-stretch polypropylene resin on one surface of a base material layer 2 mainly composed of a biaxially stretched polyamide film or sheet provided with a water resistant layer via an adhesive layer. It is the film 1 (or sheet) for packaging materials for making a pouch having water resistance.

Pouch A having heat and water resistance of the present invention
Is a stack of the above-mentioned packaging film 1 with the sealant layer 3 inside, and the packaging film 1 periphery a
The sealant layers 3 and 3 are heat-sealed together to form a bag, and b is a content filling portion.

FIG. 2 shows an embodiment of the packaging film 1 used in the pouch A having heat resistance and water resistance of the present invention.

The base material layer 2 has a biaxially stretched polyamide film 4 (for example, a thickness of 25) having water resistant layers 5, 6 (for example, a thickness of 2 μm or less, preferably about 0.5-1 μm is suitable) formed on both sides. Approximately 80 μm, approximately 25 μm is suitable, but other thicknesses are 20-30 μm, 30-60 μm, 6
It may be about 0 to 80 μm).

The base material layer 2 has a water resistant layer 5 coated on one side (front surface) of a biaxially stretched polyamide film 4 (or sheet) with a roll coater, a gravure coater or the like, and on the other side (back surface). The water resistant layer 6 coated with a roll coater, a gravure coater, or the like.

The water resistant layer 5 and the water resistant layer 6, or at least the water resistant layer 6, are made of an oil-based polyurethane resin or a water-dispersed polyurethane resin, a water-soluble acrylic acid ester copolymer or a water-soluble methacrylic acid ester copolymer. A waterproof resin such as a polymer is used, and both or either of the waterproof layers 5 and 6 is either a coating film or a laminated film (or sheet).

Further, a commercially available water resistant coat film having a water resistant layer 5 previously coated on one surface of the biaxially stretched polyamide film 4 (or sheet) is used, and the water resistant layer 6 is provided on the other surface of the water resistant coated film. You may make it coat. As the commercially available water-resistant coated film, ONM (manufactured by Unitika Ltd.), N7030 or N7032 (manufactured by Toyobo Co., Ltd.), Bonile Q or Bonil QC (manufactured by Kojin Co., Ltd.) and the like can be used.

The water resistant layer 6 contains SiO _x , Al.
A vapor-deposited film having a water vapor barrier property using a metal oxide such as ₂ O ₃ or MgO, or a polyolefin resin, polyvinylidene chloride, an ethylene-vinyl alcohol copolymer (EVO
H) and other synthetic resin film (film,
Or a sheet, or a coating film), and when the vapor deposition film is used for the water resistant layer 6, the vapor deposition film thickness is 50 to
About 2000Å is suitable, but other than 50-500
It may be about Å, 500 to 1000Å, 1000 to 2000Å.

On the surface of the water resistant layer 6, an adhesive layer 8 made of polyester adhesive, polyether adhesive, polyurethane adhesive (for example, two-component reaction-curing urethane adhesive), maleic acid-modified polypropylene resin, etc. (Adhesive for dry lamination) is formed by coating, and the film thickness of the adhesive layer 8 is, for example, a coating amount of 2.0 to 3.5 g / m ^2.
Extent, to the other, may be any coating amount 2.0~2.5g / m ^2, and preferably from about 2.5 g / m ^2.

A sealant layer 3 is formed on the surface of the adhesive layer 8.
(For example, the thickness is in the range of 25 to 70 μm and is 40 μm.
The thickness is appropriate, but in addition, the thickness is 25-40 μm, 4
It may be about 0 to 70 μm).

The sealant layer 3 is dried by pressing a heat-meltable resin film or sheet, such as unstretched polypropylene or polyethylene, having heat sealability on the surface of the adhesive layer 8 with a heat roll (about 140 ° C.). It is formed by laminating.

[0021]

The pouch having heat and water resistance of the present invention comprises a base material layer 2 mainly composed of a biaxially stretched polyamide film or sheet having water resistant layers 5 and 6 on both sides and a sealant layer 3 on one side.
Since it is made using a film for packaging material that includes
The above-mentioned pouch A of the present invention filled with contents is, for example,
When boiling in boiling water under boiling conditions of 95 ° C or higher and 99 ° C or lower, air content of 50 cc or higher, and boiling time of 20 minutes or longer, the water resistant layer 5 laminated on the pouch surface is a biaxially stretched polyamide film layer. The polyamide film layer 4 does not swell by blocking the water that permeates into the polyamide film layer 4, and the water does not permeate into the inside of the polyamide film layer 4.

Therefore, the water-resistant layer 6 on the inner surface can avoid contact with water and avoid deterioration due to water, and the water-resistant layer 6 protects the adhesive layer 8 from contact with water and boiled water. It is possible to avoid deterioration of the adhesive layer 8 due to
Therefore, the phenomenon that the sealant layer 3 is delaminated (peeled) can be prevented.

[0023]

INDUSTRIAL APPLICABILITY The heat- and water-resistant pouch of the present invention can prevent boiling water (water vapor) from penetrating into the pouch layer by the water-resistant layer laminated on the surface of the pouch, and permeation of water vapor. It is possible to prevent deterioration of the adhesive layer of the pouch inner layer due to, and it is possible to prevent delamination of the pouch, or damage or rupture of the pouch due to it.

[Brief description of drawings]

FIG. 1 is a side sectional view of a heat- and water-resistant pouch of the present invention.

FIG. 2 is a side sectional view of an example of a packaging material film used for making a pouch bag having heat resistance and water resistance according to the present invention.

FIG. 3 is a side sectional view of a conventional film for packaging material used for pouch making with heat resistance and water resistance.

[Explanation of symbols]

A ... Pouch having heat and water resistance 1 ... Film for packaging material having heat and water resistance for forming pouch 2 ... Base material layer 3 ... Sealant layer 4 ... Biaxially stretched polyamide film layer 5 ... Water resistant layer 6 ... Water resistant layer 8 ... Adhesive layer 11 ... Pouch forming film having heat and water resistance 12 ... Base material layer 13 ... Sealant layer 14 ... Biaxially stretched polyamide film layer 15 ... Water resistant layer 18 ... Adhesive layer

Claims (3)

[Claims] 1. A bag is formed using a packaging material film having a sealant layer 3 on one surface of a base material layer 2 mainly composed of a biaxially stretched polyamide film or sheet having water resistant layers 5 and 6 on both surfaces. A pouch with heat and water resistance that is characterized by 2. The water resistant layers 5 and 6 are made of SiO _x , Al ₂ O.
_3. A vapor-deposited film of a metal oxide such as MgO or MgO.
A pouch having the described heat resistance and water resistance. 3. The heat / water resistance according to claim 1, wherein the water resistant layers 5 and 6 are resin films having water resistance such as a polyolefin resin, polyvinylidene chloride and ethylene-vinyl alcohol copolymer (EVOH). Pouch with.