JPS6054852B2 - Coated metal plate manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a coated metal plate in which the surface of a continuously running strip-shaped metal substrate is continuously coated with a resin and cut at a desired location, thereby easily achieving rust prevention on the cut end surface. The purpose is to

Although this method of manufacturing a coated metal plate is high in terms of productivity, it has the disadvantage that the cut end surface of the metal substrate is coated with resin and is exposed, causing metal rust and deteriorating the appearance.

The present invention has been made in view of these drawbacks, and will be described below with reference to the embodiments shown in FIGS. 1 to 4 in accordance with the processing order.

FIG. 1 shows the entire first stage of the processing process.

In the figure, 1 is a metal substrate made of a band-shaped material (hoop material) made of, for example, a steel plate or an iron plate, and is continuously moved by feed rolls 2, 2. Reference numeral 3 denotes an extrusion molding machine, which continuously coats a continuously moving metal substrate 1 with a resin coating 4 made of, for example, vinyl chloride resin, polyester resin, polypropylene resin, or the like.

A cutting machine 5 is arranged after the resin coating process, and cuts the coated metal plate 6 into a desired length.

Reference numerals 7 and 8 are feed rolls for feeding the cut coated metal plate 6, and the rear feed roll 8 is a heating roll that strongly presses the resin coating 4.

The heating roll 8 presses against the surface of the resin coating 4 and removes the thickness of the resin layer (FIG. 2a shows this state), while moving the resin to the cut end 6a.

(Figure 2 shows this state) Of course, the heating roll 8
rotates in normal and reverse directions, and when in normal rotation it covers the cut end 6a at the rear with respect to the feed direction, and when in reverse it covers the cut end 6a at the front in the feed direction while further narrowing the roll interval. The thickness of the resin coating 4 is controlled to be constant by the heating roll 8, and roll gloss is generated on the resin surface, improving the aesthetic appearance.
FIG. 3 shows the latter stage of the processing process. In the figure, reference numeral 9 denotes a heating mold, which melts the resin gathered on the cut end surface with heat, shapes it into a regular shape, and then cools and solidifies it. After this process, a coated metal plate 6 as shown in FIG. 4 is obtained.
As described above, the coated metal plate manufacturing method of the present invention presses a heating roll against the resin surface to loosen the resin layer and move the resin to the cut end, and exposes the end surface of the metal substrate using the resin. Since it is characterized by covering the
While maintaining high productivity by producing coated metal sheets through continuous running, it was possible to prevent rust from occurring on the exposed metal portion of the cut end surface.

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[Brief explanation of the drawing]

1 to 4 show embodiments of the present invention.
The figure is a schematic diagram showing the entire first stage of the processing process, Figure 2 is an enlarged view of the main parts of the same as above, Figure 3 is a schematic diagram showing the latter stage of the processing process, and Figure 4 is a cross-sectional view of the coated metal plate as a finished product. shows.

Claims (1)

[Claims] 1. In a coated metal plate manufacturing method in which the surface of a continuously running strip-shaped metal substrate is continuously coated with resin and cut at a desired location, a heating roll is pressed against the resin surface and the thickness of the resin layer is thinned to the cut end. A method for manufacturing a coated metal plate, comprising moving a resin component and covering an exposed portion of an end surface of a metal substrate with the resin component.