JPH08132561A - Cellophane laminate and manufacture thereof - Google Patents

Abstract

PURPOSE: To provide a cellophane laminate forming a very thin heat-sealed layer and the manufacture thereof. CONSTITUTION: An ionomer resin coating 4 having a thickness thinner than 15μm is provided on cellophane 2 via an anchor coat layer 3. Further, in order to manufacture a cellophane laminate 1, the anchor coat layer is provided on the cellophane and, after an ionomer resin solution is applied on the anchor coat layer in the quantity of 2 to 30g/m<2> in terms of solid content, the solution 18 dried.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cellophane laminate, particularly a heat-sealable cellophane laminate and a method for producing the same.

[0002]

2. Description of the Related Art Cellophane is widely used as a packaging material because of its properties such as excellent transparency, resistance to static electricity, good tearability and appropriate rigidity.
Due to lack of moisture resistance, polyvinyl chloride, polyvinylidene chloride, or a copolymer thereof is applied and subjected to moisture proof processing, and is commercially available as moisture proof cellophane.

However, these chlorine-based resins have a problem of generating chlorine gas when incinerated.

[0004]

On the other hand, there is also one in which polyethylene is extruded and laminated on cellophane (for example, Japanese Patent Publication No. 4-62261) or a film is laminated, but in both cases, the synthetic resin layer becomes thicker at 15 to 40 μm, There is a problem that the properties of cellophane itself, such as transparency and appropriate rigidity, are obstructed.

Accordingly, an object of the present invention is to form an extremely thin resin layer on cellophane without using a chlorine-based resin, and to impart heat sealing properties and moisture resistance to cellophane.

[0006]

To solve the above problems, in the present invention, an ionomer resin coating film having a thickness of less than 15 μm is provided on cellophane via an anchor coat layer.

To obtain a cellophane laminate as described above,
First, an anchor coat layer is provided on cellophane, and the ionomer resin solution is added to the anchor coat layer in a solid content of 2 to 3
It was applied at 0 g / m ² and then dried.

[0008]

By coating the resin as described above, an extremely thin coating layer having a thickness of 15 μm or less can be provided, so that the characteristics of cellophane are not impaired.

[0009] Further, since the ionomer resin hardly emits a harmful gas by incineration and has a good heat-sealing property, it can be heat-sealed at a low temperature such as 100 ° C, and the contents of the package, etc. Does not adversely affect.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, a cellophane laminate 1 of the present invention is one in which a synthetic resin coating film 4 is provided on a cellophane 2 as a base material via an anchor coat layer 3.

The cellophane 2 may be an ordinary commercial product,
The thickness is about 20 to 40 μm.

The anchor coat layer 3 is formed by applying a polyimine resin, polyurethane or the like and drying it, and a thickness of 0.3 to 1 μm is sufficient.

The coating film 4 is made of an ionomer resin and has a film thickness of less than 15 μm. Preferably 10
μm or less. This resin has high safety and does not generate chlorine gas during incineration. In addition, because the film thickness is thin, the transparency of cellophane can be maintained, and smoothness is not lost.
Less curl occurs. On the other hand, the coating film 4 enhances the moisture resistance and the heat sealability.

A method of manufacturing the above cellophane laminate 1 will be described with reference to FIG.

First, the anchor coat solution 10 is applied to the base material cellophane 2 by the roller 11 and is passed through the drying zone 12 to be dried to form the anchor coat layer 3.

Next, the ionomer resin solution 13 is applied on the upper surface of the anchor coat layer 3 by the roller 14, and the solvent is vaporized in the drying zone 15 and simultaneously dried and solidified to form the resin thin film 4, and then the coil 16 is formed. Roll up.

The ionomer resin solution 13 is a mixture of ionomer in an amount of 2 to 10% by weight in methanol. When an aqueous emulsion of ionomer resin is used, the volume ratio of water to methanol is controlled to suppress swelling of cellophane. Is in the range of 5: 5 to 1: 9, that is, methanol rich.

Such a solution 13 is added in a resin solid content of 2 to 3
When applied at 0 g / m ^2, a coating film 4 having a thickness of less than 15 μm is formed. The coating amount is preferably ^{2 to 20} g / m ² , and the thickness of the coating film 4 is preferably 10 μm or less.

Hereinafter, experimental examples and comparative examples of the present invention will be described.

Experimental Example A polyimine resin solution was applied to cellophane having a thickness of 20 μm and dried to form an anchor coat layer having a thickness of 0.5 μm.

On the other hand, a solution prepared by mixing 5% by weight of an ionomer in methanol was used in an amount of 4 g / m ² , 7 g / m ² and 1, respectively.
A solid content of 1 g / m ² or 16 g / m ² was applied on the anchor coat layer and dried to about 3 μm, 6 μm,
Four types of cellophane laminates having ionomer coatings of 0 μm and 14 μm were prepared.

[Comparative Example] 20 μm thick cellophane alone,
Three types were prepared: moisture-proof cellophane having a polyvinyl chloride coating film having a thickness of 1 μm on cellophane having a thickness of 20 μm, and conventional polycello having a polyethylene layer having a thickness of 20 μm formed by extruding polyethylene on cellophane having a thickness of 20 μm.

The transparency, heat sealability and hygroscopicity of the films of the above experimental examples and comparative examples were tested. The unit haze of transparency is 0 when transparency is 100%. The heat sealability is as follows: temperature 100 ° C and 150 ° C, pressure 2k
The cellophane alone was heat-sealed under the conditions of g / cm ² and 2 seconds, and a 180 ° peel test was performed to measure its strength. The unit is g / 15 mm width. The hygroscopicity was measured by measuring the amount of hygroscopicity when left in an atmosphere at a temperature of 20 ° C. and a humidity of 65% for 100 hours.

The results are shown in FIG.

[0026]

[Effect] According to the present invention, as described above, since the extremely thin ionomer resin coating film is formed on cellophane, good heat-sealing property can be achieved without impairing transparency and moderate rigidity which are the characteristics of cellophane. In particular, heat sealability that can be used even at low temperatures can be imparted, and moisture resistance can also be improved.

Furthermore, it is highly safe and does not generate chlorine gas when incinerated.

Therefore, the cellophane laminate of the present invention has many uses such as individual packaging and inner packaging of confectionery, packaging of powdered seasonings and powdered foods, packaging of deodorants and oxygen scavengers, and bandage of banknotes. It is suitable.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a cellophane laminate of the present invention.

FIG. 2 is a schematic view showing the manufacturing process of the same.

FIG. 3 is a chart showing test results of experimental examples and comparative examples.

[Explanation of symbols]

 1 Cellophane laminate 2 Cellophane 3 Anchor coat layer 4 Ionomer resin coating film 10 Anchor coat solution 11 Roller 12 Drying zone 13 Ionomer resin solution 14 Roller 15 Drying zone 16 Coil

Claims (4)

[Claims] 1. A cellophane laminate in which an ionomer resin coating film having a thickness of less than 15 μm is provided on cellophane via an anchor coat layer. 2. The cellophane laminate according to claim 1, wherein the resin coating film has a thickness of 10 μm or less. 3. An anchor coat layer is provided on cellophane,
A method for producing a cellophane laminate, which comprises coating the anchor coat layer with an ionomer resin solution in a solid content of ² to 30 g / m ² and then drying. 4. The solid content of the ionomer resin is 2 to 2
The method for producing a cellophane laminate according to claim 3, wherein 0 g / m ^{2 is} applied.