JPH01123730A - Manufacture of coated metallic sheet - Google Patents

Abstract

PURPOSE:To prevent the blisters or pin holes causing rust, while no air bubbles remain in the gap between each fiber of a resin sheet by using the structure in which the resin sheet stuck onto a metallic sheet is buried in a thermoplastic sheet. CONSTITUTION:A thermoplastic sheet is stuck onto the surface of a metallic sheet which is coated with an adhesive and is dried, and a fiber sheet is almost buried under pressure in the thermoplastic sheet melted under heating. A weathering resistant resin film is stuck to said plastic sheet under heating and pressuring, or it is coated with a weathering resistant coating and is cured. Then, on these film layers or on the surface of the coated layer, an emboss pattern is formed. As the thermoplastic sheet, e.g., the sheet of the synthetic resin such as soft vinyl chloride resin, ethylene, polypropylene and polyester, etc. or synthetic rubber, is used. The thermoplastic sheet has the thickness (generally about 80-150mu) into which the fiber sheet may be almost buried.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing coated metal plates. More specifically, the present invention relates to a method for manufacturing a coated metal plate laminated with a fiber sheet.

[Conventional technology]

Conventionally, when producing a coated metal plate by bonding fiber sheets together and finishing the surface with a weather-resistant resin film or weather-resistant coating, the fiber sheets are first bonded to both or one side of the metal plate using an adhesive. .

A weather-resistant resin film is then heat-pressed onto it.

The method used is to apply and harden weather-resistant paint.

However, in such a method, air bubbles remain in the gaps between each fiber of the fiber sheet, and it is difficult to completely remove them. If you leave it in this state and finish it by heat-bonding a weather-resistant resin film or applying and curing a weather-resistant paint.

After this is installed as an exterior material, the expansion of the air that stays inside can cause blistering, or pinholes can cause moisture or steam to enter the internal voids, causing rust.

[Problem that the invention seeks to solve]

Therefore, as a result of repeated studies on a method for completely removing the air in the fiber sheet layer, which is the cause of such undesirable phenomena, the inventors of the present invention discovered a method in which the fiber sheet is almost completely buried in the molten thermoplastic sheet. It has been found that this problem can be effectively solved.

[Means for solving problems]

Accordingly, the present invention relates to a method for manufacturing coated metal sheets.

The coated metal plate is manufactured by pasting a thermoplastic sheet on the surface of the metal plate that has been coated with an adhesive and dried, and then embedding most of the fiber sheet under pressure into the heated and melted thermoplastic sheet. This is carried out by thermo-compression bonding a weather-resistant resin film or by applying and curing a weather-resistant paint, and at the time forming an embossed pattern on the surface of the film layer or coating layer.

Examples of thermoplastic sheets include soft vinyl chloride resin,
A sheet of synthetic resin or synthetic rubber such as polyethylene, polypropylene, or polyester, with a thickness that allows most of the fiber sheet to be buried (generally about 8.
0 to 150μ) is used.

The adhesive to be applied and dried on both or one side of a metal plate, typified by a steel plate, is appropriately selected from those having compatibility with the thermoplastic resin forming the sheet and the metal plate.

After bonding a thermoplastic sheet onto a metal plate using such an adhesive, the sheet is heated to a temperature higher than the melting temperature of the thermoplastic resin or rubber that forms the sheet, and then a fiber sheet is heated using a hot roll or the like. Squeeze and bury it. Here, as the fiber sheet, a glass fiber sheet, a carbon fiber sheet, a polyester fiber sheet, a polypropylene fiber sheet, a polyester nonwoven fabric sheet, a polypropylene nonwoven fabric sheet, etc. with a basis weight of 10 to 20 g/m'' are used.

In this way, the fiber sheet is completely buried in the thermoplastic sheet or pressed to the extent that it is slightly exposed on the surface, and then a weather-resistant resin film is thermocompressed or a weather-resistant paint is applied thereon. Let it harden.

Weather-resistant resin films include 1, for example, colored acrylic resin film (approximately 50 to 100 μm thick), acrylic resin-vinyl chloride resin blend film (approximately 50 μm thick), and fluororesin film (approximately 30 to 50 μm thick); 1 colored acrylic film; A resin-fluororesin blend film (about 40 μm thick) is used. Further, as weather-resistant paints, for example, water-based emulsion-based or solvent-based acrylic resin paints, solvent-based urethane resin paints, solvent-based fluororubber paints, etc. are used.

At this time, if a roll shaped to form an embossed pattern is used for thermocompression bonding of the weather-resistant resin film or application and curing of the weather-resistant paint, an embossed pattern will be simultaneously formed on the surface of the film layer or paint layer. Ru.

〔Effect of the invention〕

According to the method of the present invention, the fiber sheet bonded onto the metal plate is embedded in the thermoplastic sheet, so that no air bubbles remain in the gaps between the fibers of the fiber sheet. The dimensional stability of the layer is improved and strengthened, so
When this coated metal plate is installed as an exterior material, it no longer produces blisters or pinholes that can cause rust.

〔Example〕

Next, the present invention will be explained with reference to examples.

Example An acrylic resin adhesive consisting of 51 parts of acrylic resin (weight, same hereinafter), 5 parts of phenol resin, 5 parts of urethane resin, 0.5 part of hexamethylenetetramine, and 30 parts of organic solvent was applied to both sides of a metal plate. Both were applied to a thickness of 30μ so that the thickness of the adhesive layer was within 10μ after drying and curing.

This adhesive layer is covered with a soft vinyl chloride resin sheet (thickness 100 mm).
μ) was applied, and in a heated and softened state, gelas mat (basis weight 10 g/m'') was compressed with a hot roll and buried.

On top of this, a colored blend film (thickness: 40 μm) of acrylic resin and fluororesin is bonded under heat and embossed on the surface, so that the coating layer is within 300 g/m” on both sides according to the certification conditions for noncombustible materials. I made it.

When the coated metal plate thus formed was attached as an exterior material, it did not generate blisters or pinholes even after long-term use.

Agent Patent Attorney Yoshi 1) Toshio Procedural amendment (white side) December 9, 1986

Claims (1)

[Claims] 1. Paste a thermoplastic sheet on the metal plate surface that has been coated with adhesive and dried, bury most of the fiber sheet under pressure in the heated and melted thermoplastic sheet, and then apply a weather-resistant resin film. Apply thermocompression or weather-resistant paint and cure.
A method for producing a coated metal plate, which comprises forming an embossed pattern on the surface of the film layer or coating layer.