Method for forming sheets having reduced surface imperfections

Details Method for forming sheets having reduced surface imperfections Method for forming sheets having reduced surface imperfections

1978-09-26

1980-02-05

Flint, Jr., J. Howard

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

425406, 264293, B29G 100

Patent

active

041872746

ABSTRACT:
A mold for compression molding a plastic sheet from a viscous fluid provides more resistance to flow on the side of the sheet designed to be the underside than on the side of the sheet designed to be seen. This resistance to flow can be imparted by roughening the underside of the mold more than the top surface of the mold. The purpose for roughening one surface of the mold more than the other is so that the plastic mass will flow faster on the smoother side of the mold and carry bubbles to the rough side of the mold via a rolling action. By this method employing textured molds, the surface of automotive panels can be made having reduced surface imperfections.

REFERENCES:
patent: 3466259 (1969-09-01), Jernigan
patent: 3548030 (1970-12-01), Jernigan
patent: 3577478 (1971-05-01), Thorpe
patent: 3674893 (1972-07-01), Nowak et al.
patent: 3701748 (1972-10-01), Kroekel
patent: 3772241 (1973-11-01), Kroekel

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