JPH0796699A - Manufacture of inorganic decorative plate - Google Patents

Abstract

PURPOSE:To provide a method tor manufacturing an inorganic decorative plate wherein a highly decorative picture pattern harmonized with an embossing is efficiently provided on an inorganic decorative base material having the embossing on its surface. CONSTITUTION:A transfer sheet is laid on the surface of an inorganic decorative plate base material 6 having an embossed shape on its surface, which is bonded with heat pressure by a desired means such that it follows the said embossed shape. After a transferred base film 1 of the transfer sheet is peeled, a picture pattern layer 7 of the transfer sheet on the inorganic decorative plate base material 6 is further bonded with the heat pressure by the desired means such that it follows the embossed shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an inorganic decorative board by efficiently providing a highly decorative design on an inorganic decorative board substrate having an embossed shape which is used as an exterior material or the like.

[0002]

2. Description of the Related Art Conventionally, various inorganic decorative boards have been used for the exterior of houses, but in recent years, products having embossed surfaces have been favored along with the tendency toward higher quality and higher design. If there is embossing on the surface, there is a simple manufacturing method such as painting with a single color paint or sprinkling sand, but there is also a transfer method using an elastic body as a method of painting in synchronization with embossing, It was difficult to completely adhere the pattern layer due to the lack of transfer of the embossed concave portion.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and it is an object of the present invention, in particular, to provide an inorganic decorative board substrate whose surface is embossed. On the other hand, another object of the present invention is to propose a method for manufacturing an inorganic decorative board, which efficiently provides a design with high design in harmony with embossing.

[0004]

In order to solve this problem, the present invention places a transfer sheet on the surface of an inorganic decorative board base material having an embossed shape on the surface, and follows the embossed shape by a desired means. After the base film of the transfer sheet is peeled off by thermocompression bonding, the pattern layer of the transfer sheet transferred onto the inorganic decorative board substrate is further thermocompression bonded so as to follow the embossed shape by a desired means. A method for manufacturing an inorganic decorative board is provided. Further, there is provided a method for producing an inorganic decorative board, characterized in that the thermocompression bonding is carried out by a roll-shaped elastic body or through a flat elastic body.

The present invention will be described in detail below. FIG. 1 shows an example of the cross-sectional structure of the transfer sheet used in the present invention. The base film 1 has a structure in which a release varnish layer 2, a pattern layer 3, and an adhesive layer 4 are sequentially provided on the surface of the base film 1.

As the base film, a thermoplastic resin film capable of following the surface embossed shape on the inorganic decorative board base material by the heat of thermocompression bonding at the time of transfer by the elastic body is used. Specific examples include vinyl chloride, polyretylene, polypropylene, nylon, polyester, and the like.

The type and thickness of the base film may be selected depending on the degree of embossing on the surface and the transfer temperature. For example, at a transfer temperature of 150 ° C. to 180 ° C., a vinyl chloride resin film having a thickness of 100 μm or less gives the best results.

The release varnish layer may be appropriately selected depending on the type of the base film, but when vinyl chloride is used as the base film, polyvinyl butyral gave good results.

The pattern layer can be printed by ordinary gravure printing, screen printing or the like. The binder of the ink is determined in consideration of the elongation during heating, the durability of the final product, and the like.

As the adhesive layer, polyvinyl alcohol,
Acrylic, hydroxymethyl cellulose, polyester, polyamide and the like are used. Further, when assuming the step of applying the adhesive agent on the base material in advance, the adhesive agent is not always necessary.

FIG. 2 shows a state in which a pattern is transferred onto the inorganic type decorative board substrate. The transfer sheet is placed so as to be synchronized with the embossed shape, and thermocompression bonding is performed using the heated roll 5 so as to follow the embossed shape on the surface. As a method of thermocompression bonding that follows other embossed shapes, a method of using a flat elastic body, an elastic roll of a shape having a relationship between a surface embossed shape and a male type or a female type, or a flat type is used. There are ways.

As the inorganic decorative board base material 6, asbestos cement, calcium silicate board, magnesium silicate board, wood chip cement board and the like can be used.

FIG. 3 shows a state in which after the base film 1 of the transfer sheet is peeled off, the remaining pattern layer 7 is further thermocompression bonded by the heated roll 5. Further, FIG. 4 shows a case where thermocompression bonding is performed via the flat elastic body 8. In addition, thermocompression bonding can be performed so as to follow the embossing by the method described above. Further, clear coating may be applied on the surface for protection of the surface.

[0014]

[Function] In transfer, the cause of transfer dropout of fine embossed recesses is that the transfer sheet is interposed between the elastic body to be thermocompression-bonded and the base material, and therefore, the thickness of the transfer sheet and shrinkage due to application of heat may occur. Because of the influence, it is difficult for the elastic body to completely follow the concave shape.

According to the present invention, after the base film of the transfer sheet is peeled off and further thermocompression-bonded, the pattern layer floating on the embossed recess without being adhered is thermocompression-bonded. Since the base film of the transfer sheet is peeled off and then thermocompression-bonded, the pattern layer is also adhered to the embossed recesses of a shape that could not be adhered in the transfer so far without the base film of the transfer sheet being interposed. You can

[0016]

【Example】

<Example 1> A base film of a transfer sheet having a thickness of 75
After applying a polyvinyl butyral resin as a release varnish layer on this surface using a semi-rigid vinyl chloride sheet of μm,
By a gravure printing method using an ink using vinyl chloride resin as a binder, a pattern that is in harmony with the embossed shape of the inorganic decorative board substrate described below is printed to form a pattern layer, and then a polyester resin is applied as an adhesive layer. Then, a transfer sheet was prepared.

On the other hand, a calcium silicate board having a brick-like embossed surface was prepared as an inorganic decorative board base material, dust was removed, and a sealer treatment was performed. After the adhesive was applied and dried, transfer was performed using a roll formed of silicon heated to 150 ° C. and having a surface hardness of 40 °. After the transfer, the base film of the transfer sheet was peeled off and thermocompression bonded with a roll heated to 150 ° C. and having a surface hardness of 40 °.

Example 2 Using the same transfer sheet as in Example 1, a calcium silicate plate having a brick shape on the surface was prepared as an inorganic decorative plate substrate, dust was removed, and a sealer treatment was performed. After applying and drying the adhesive, a transfer sheet similar to that used in Example 1 was thermocompression-bonded using a roll formed of silicon having a surface hardness of 40 ° heated to 150 ° C. Was transcribed. After transfer, the base film of the transfer sheet is peeled off, and further heated to 150 ° C to a thickness of 20 m.
Thermocompression bonding was performed using flat silicon having a surface hardness of 40 °.

On the surface of the decorative boards obtained in Examples 1 and 2,
An acrylic urethane top coat was applied as a surface protective layer. The decorative board thus obtained had a very high designability, following a fine embossed shape and having a synchronized pattern.

[0020]

As described above, according to the present invention, after transfer and peeling, by further thermocompression bonding with a roll, heat and pressure bonding from a transfer sheet as in the prior art is performed, and thus the designability is improved. It is now possible to obtain a high-quality inorganic decorative board with a harmony of embossing and design. The design layer was also pressure-bonded to the concave portion of the base material, and it was possible to obtain an inorganic decorative board with a high design in which the embossing and the design were in harmony.

[0021]

[Brief description of drawings]

FIG. 1 is a schematic view showing a configuration of a cross section of a transfer sheet used in the present invention.

FIG. 2 is a schematic diagram showing a state in which a transfer sheet is thermocompression bonded by a roll.

FIG. 3 is a schematic view showing a state in which a base layer film of a transfer sheet is peeled off by a roll-shaped elastic body and then a design layer is thermocompression bonded.

FIG. 4 is a schematic view showing a state in which the pattern layer is thermocompression bonded after the base film of the transfer sheet is peeled off by the flat elastic body.

[Explanation of symbols]

1 ... Base film 2 ... Release layer 3 ... Design layer 4
... Adhesive layer 5 ... Roll-shaped elastic body 6 ... Inorganic decorative board base material 7
… Design layer 8… Flat elastic body

Claims (3)

[Claims] 1. A transfer sheet is placed on the surface of an inorganic decorative board base material having an embossed shape on the surface, thermocompression-bonded by a desired means so as to follow the embossed shape, and after peeling the base film of the transfer sheet, Furthermore, the method for producing an inorganic decorative board, characterized in that the pattern layer of the transfer sheet transferred onto the inorganic decorative board substrate is thermocompression bonded by a desired means so as to follow the embossed shape. 2. The method for producing an inorganic decorative board according to claim 1, wherein the thermocompression bonding is performed by using a roll-shaped elastic body. 3. The method for producing an inorganic decorative board according to claim 1, wherein the thermocompression bonding is performed via a flat elastic body.