PROCEDURE AND APPARATUS FOR CONTINUOUS PRODUCTION OF CORRUGATED/UNDULATED SHEETS IN A WINDABLE WEB; WINDABLE THERMOPLASTIC WEB WITH TRANSVERSE CORRUGATIONS/UNDULATIONS

摘要

A continuous web of corrugated thermoplastic material sheet is produced with the wave or zigzag shapes disposed with their axes transverse to the direction of extrusion, or of travel, of said web, by passing it between a forming cylinder provided with grooves communicating with a suction means, and a drawing cylinder collaborating therewith. The corrugated sheet is windable and this facilitates application, storage and transport thereof.