Method for forming sheets having reduced surface imperfections

摘要

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.