Method for the manufacture of thermoplastic resin sheets

Details Method for the manufacture of thermoplastic resin sheets Method for the manufacture of thermoplastic resin sheets

1990-03-29

1992-09-29

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264 406, 264169, 4253781, 425461, B29C 4792

Patent

active

051512343

ABSTRACT:
A method for the manufacture of thermoplastic resin sheets, including extruding molten thermoplastic resin at an extrusion velocity V through a slit provided in an extrusion mold so as to form thermoplastic resin sheets with embossed surfaces, wherein said thermoplastic resin is extruded from said slit in said extrusion mold under conditions such that the ratio V/H of said extrusion velocity V to the width H of said slit exceeds a critical value (V/H)c, said critical value (V/H)c being the ratio of the extrusion velocity to the width of the mold slit corresponding minimum value of the roughness of the embossment formed on the surface of said thermoplastic resin sheets, whereby defects such as the adhesion to and winding onto rollers, inferior appearance and sizing marks which are prone to occur when the sheets are embossed with embossing rollers.

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