JPS5945187A - Facing method of steel plate - Google Patents

Abstract

PURPOSE:To form a distortion-free pattern on the surface of a steel plate by pressurizing a transfer sheet laminated with a resin coat layer, a pattern layer and an adhesive layer in that order on the steel plate after a thermoplastic resin sheet is placed thereon. CONSTITUTION:A transfer sheet 1 develops an adhesivity with the activation of an adhesive layer 5 by heat when transferred and peels off between a transfer sheet base material 2 and a resin coat layer 3. A pattern layer 4 is formed using an ink usually used for fancy papers and transfer papers, that containing a hardener of the resin coat layer 3 or that having a reaction group reactive to the resin of the resin coat layer 3 and the pattern is selected from among abstract patterns such as grain pattern, cloth pattern, pebble pattern and lattice pattern as desired. The transfer sheet thus obtained is pressed together with a thermoplastic resin sheet 8 on a steel plate 6 heated up to 180-220 deg.C after the application of an adhesive 7 thereon by means of a pressure roll 9 and then, only the transfer sheet base material 2 is removed. In this matter, a steel plate is obtained as decorated with a thermoplastic resin sheet having a pattern layer and resin coat layer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for decorating a steel plate, and more specifically, when laminating a thermoplastic resin sheet on the surface of a steel plate, a pattern is applied to the surface of the sheet by transfer, thereby creating a distortion-free pattern on the steel plate. It relates to a method of forming on a surface.

Conventional methods for applying decorations such as patterns to the surface of a steel plate include printing directly on the surface of the steel plate, or laminating sheets with printed patterns through an adhesive. Direct printing methods include applying paint to the surface of a steel plate to form a resin layer, or laminating a resin sheet such as a PVC sheet, and applying a pattern to the surface using a gravure offset printing method, etc. This method has problems with printing clarity, registration accuracy, etc., and is often unsatisfactory in terms of design effect.

In addition, the method of laminating sheets with printed patterns does not have any problems in terms of print clarity and registration accuracy, but the sheet expands and contracts due to the heat applied when laminating it with the steel plate, and the pattern on its surface is distorted. This has the disadvantage that the image is distorted, making it impossible to form abstract patterns such as lattice patterns.

The present invention has been made in order to eliminate the drawbacks of the conventional methods as described above, and relates to a method of laminating a thermoplastic resin sheet to a steel plate and at the same time forming a pattern by transfer using the heat applied at that time. It is something.

First, the structure of the transfer sheet used in the method of the present invention will be explained.

As shown in Figure 1, the transfer sheet (1) includes a transfer sheet base material (2), a resin coat layer (3), a pattern layer (4), and an adhesive layer (
5), and during transfer, the adhesive layer (5) is activated by heat to develop adhesive properties, and is peeled off at the interface between the transfer sheet base material (2) and the resin coat layer (3).

As the transfer sheet base material (2), paper laminated with polypropylene, paper coated with a polyamide resin as a release layer, etc. are used, and irregularities are formed on the surface as necessary.

The resin coating layer (3) contains 8 to 12 g/m2 (d
rY) is formed by coating and configured to be easily peeled off from the transfer sheet base material (2).

The pattern layer (4) is formed using an ink commonly used for decorative paper or transfer paper, an ink containing a curing agent for the resin coat layer (3), or an ink having a reactive group that reacts with the resin of the resin coat layer (3). , a wood grain pattern, a cloth grain pattern, a stone grain pattern, an abstract pattern such as a lattice pattern, and the like.

The adhesive layer (5) is formed of an adhesive such as acrylic, nitrified cotton yarn, or urethane vinyl, and is heated to a temperature of 120°C to 15°C by applying heat to the steel plate when laminating the thermoplastic resin sheet.
The composition is such that sufficient transfer can be performed at a temperature of 0°C.

The transfer sheet with the above structure is shown in Fig. 2 or 3.
As shown in the figure, apply adhesive (7) and
A thermoplastic resin sheet (8) is placed on a steel plate (6) heated to 20°C.
) with a pressure roll (9), and then only the transfer sheet base material (2) is removed, a steel plate decorated with a thermoplastic resin sheet with a pattern layer and a resin coating layer can be obtained.

(Example) The transfer sheet is a thin paper with a basis weight of 50 g/m2 and polypropylene is laminated with an extruder to a thickness of 20μ. 2) The ink layer is a pattern printed with ordinary salt-vinyl acetate ink, and (c) the adhesive varnish layer is an acrylic lacquer-based paint Ryulak Clear 248 (Inu Nippon Ink Kagaku). The film was coated with a dry coating amount of 1 to 3 F//m 2 using a dry coater (manufactured by Kogyo ■).

The steel plate is a hot-dip galvanized steel plate with a thickness of 0.6 m and adhesive 8
5g dry application amount of C454 (manufactured by Sony Chemical)
After coating to ~l Og/m2, the plate was heated to a temperature of 200℃ to 220℃, and a PVC film for steel plates (thickness 0.2M3, made of resin ■) was attached at the same time as above. A decorative steel plate was obtained by transferring the pattern, etc. using transfer paper, and after cooling, the transfer base sheet was peeled off.

According to the method of the present invention as described above, (1) a delicate and clear pattern can be formed on the surface of the steel plate without distortion, and there are no restrictions on the pattern.

■At the same time as the pattern, a resin coat layer for hardening type surface protection and gloss adjustment is transferred, so it is possible to provide a decorative layer with excellent surface performance (solvent resistance, abrasion resistance, weather resistance, etc.). Embossing can also be performed at the same time as or after the transfer.

[Brief explanation of drawings]

The drawings show an example of the method of the present invention, and FIG. 1 is a sectional view of a transfer sheet, and FIGS. 2 and 3 are explanatory views showing the makeup process. (1)...Transfer sheet (2)...Transfer sheet base material (
3) Resin coat layer (4) Pattern layer (5)
... Adhesive layer (6) ... Steel plate (7) ...
Adhesive (8)...Thermoplastic resin sheet (
9)...Pressure roll patent applicant Toppan Printing Co., Ltd.

Claims (1)

[Claims] A transfer sheet is prepared by sequentially providing a resin coat layer, a pattern layer, and an adhesive layer on a transfer sheet base material, then applying an adhesive to the surface of a steel plate, heating the steel plate, and then bonding a thermoplastic resin sheet and the transfer sheet. A method for decorating a steel sheet, which comprises sequentially stacking the sheets and applying pressure, and then removing only the transfer sheet base material.