Process of imparting smoothness to the surface of a thermoplastic sheet

Claim 1

A PROCESS FOR IMPARTING IMPROVED SMOOTHNESS TO THE WEAR SURFACE OF A SHEET OF THEMOPLASTIC VINYL RESINOUS MATERIAL WHICH COMPRISES CONTINUOUSLY PASSING THE SHEET AT A TEMPERATURE BELOW THE FLOW POINT TEMPERATURE OF THE SHEET BETWEEN THE NIP OF TWO ROTATING ROLLS THEREBY APPLYING UNIFORM PRESSURE ON SUCCESSIVE PORTIONS OF THE SHEET, ONE ROLL CONTACTING SAID WEAR SURFACE OF SAID SHEET HAVING A SMOOTH HARD SURFACE COMPLETELY COVERED WITH A THIN FILM OF A LIQUID SILICONE COMPOUND AND MAINTAINED AT A TEMPERATURE WHICH CAUSES THE SURFACE OF THE SHEET CONTACTING THE ROLL TO FLOW AS IT PASSES BETWEEN SAID NIP, THE OTHER ROLL BEING MAINTAINED AT A TEMPERATURE SUBSTANTIALLY LESS THAN THE FIRST ROLL, THEREBY CONSOLIDATING SAID WEAR SURFACE OF THE SHEET AND ELIMINATING PITS AND GROOVES THEREFORM, AND CONTINUOUSLY REMOVING SAID SHEET FROM BETWEEN AND SIMULTANEOUSLY OUT OF CONTACT WITH SAID ROLLS WITHOUT REDUCING THE TEMPERATURE OF SAID SMOOTH HARD SURFACE ROLL.