Process for making a plastic sheet

Details Process for making a plastic sheet Process for making a plastic sheet

1977-07-19

1978-08-01

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156286, 156289, 156323, 264 88, 264 90, 264109, B29C 1706

Patent

active

041041011

ABSTRACT:
In a process for producing plastics sheet or film having a face which conforms to a face of a master, e.g. a ground glass surface, comminuted plastics material is placed in a layer on the master and a parting sheet is placed over the plastics material. Force is applied evenly over all of the area of the plastics layer, e.g. as by fluid pressure through a diaphragm, and the plastics material is heated to its fusion temperature such that the plastics materials flows into a coherent sheet or film. Relatively low fluid pressures, e.g. atmospheric and less, may be used. In a further step, the flat face of plastics sheet or film formed in this way is metallized and then covered with an abrasion resistant transparent coating, to result in a high quality mirror. In a preferred process, the transparent coating is cured rapidly by application of radiant heat.

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