Process for preparing laminated plate

Details Process for preparing laminated plate Process for preparing laminated plate

1983-07-20

1985-06-04

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156243, 15624411, 15624423, 15624424, 15624427, 156322, 156324, B32B 3122

Patent

active

045212651

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to a process for preparing a laminated plate. More particularly, it relates to a process for preparing a laminated plate by laminating metallic sheets on both surfaces of a thermoplastic synthetic resin.
2. Description of the Prior Art
A laminated plate prepared by laminating metallic sheets on both surfaces of a thermoplastic synthetic resin sheet has been well-known in, for example U.S. Pat. No. 3,382,136 and has been used in various usages as a laminated product having both characteristics of a metal and a thermoplastic synthetic resin (hereinafter referring to as a synthetic resin). Such laminated plate has been continuously prepared by processes including the following steps disclosed in U.S. Pat. No. 3,616,019. That is, the process includes (a) a heating step of heating two sheets of metallic sheets stretched under a constant tension; (b) a laminating step of forming a laminating plate by feeding preheated metallic sheets and a molten synthetic resin sheet between heat-press rolls to place the synthetic resin sheet between the metallic sheets; and (c) a cooling step of cooling the resulting laminated plate.
Thus, one disadvantage of the process is to form creases and waves on the metallic sheet surface of the laminated plate. Such disadvantage of the metallic sheet surface causes inferior appearance in the case of the use of the laminated plate, for example, as a board of a furniture. When the metallic sheet is thinner or the synthetic resin sheet is thicker, the formation of creases or waves is more significant.
Thus, the formation of creases on the metallic sheet surface has been overcome by certain methods. Transverse wave formed on the metallic sheet surface in the direction perpendicular to the stretching direction of the laminated plate has been also overcome. However, any effective process for overcoming longitudinal wave formed on the metallic sheet in the stretching direction of the laminated plate has not been found.
An object of the present invention is to provide a laminated plate having no longitudinal wave on the metallic sheet surface. The object has been easily attained by the process of the present invention.


SUMMARY OF THE INVENTION

The present invention provides a process for preparing a laminated plate by laminating metallic sheets on both surfaces of a thermoplastic synthetic resin sheet, and is to provide a process for preparing a laminated plate which comprises
(a) preheating two metallic sheets stretched under a constant tension;
(b) forming a laminated plate by feeding the preheated metallic sheets and a molten synthetic resin sheet between heat-press rolls to place the synthetic resin sheet between the metallic sheets;
(c) passing the laminated plate among a plurality of rolls placed in zig-zag positions to form curves of the laminated plate in a degree less than its bending elastic limit; and
(d) cooling the laminated plate to reduce the temperature of the synthetic resin to the softening point or lower on the rolls in the bending step.


DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The metallic sheets (1), (1') and a synthetic resin sheet (2) used in the process of the present invention will now be illustrated.
The metallic sheets (1), (1') can be sheets made of aluminum, steel, stainless steel, iron, copper, tin or nickel or an alloy thereof. A thickness of the metallic sheet (1), (1') is 0.5 mm or less and usually in a range of 0.05 to 0.5 mm.
The synthetic resin sheet (2) is made of one used for a conventional extrusion molding process which is not critical, for example, polyethylene, polypropylene, polybutene, polyvinyl chloride, polystyrene, polyamide and polycarbonate. In view of extrusion moldability, it is preferable to use a polyolefin type synthetic resin such as polyethylene, polypropylene and polybutene. The thickness of the synthetic resin sheet (2) is not critical and is selected depending upon the thickness of the laminated plate and is usually in a range of 0.3 to

REFERENCES:
patent: 3408240 (1968-10-01), Williams
patent: 3684610 (1972-08-01), Frielingsdorf et al.
patent: 3940216 (1976-02-01), Hinckley

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