Method of molding intractable polymers

Claim 1

A CONTINUOUS METHOD FOR MAKING A FULLY CONSOLI DATED, MAXIMUM DENSITY, PLASTIC SHEET COMPRISING CONTINUOUSLY INTRODUCING A NON-SINTERED FINELY-DIVIDED POLYMERIC THERMOPLASTIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF INTRACTABLE POLYMERS AND HEAT SENSITIVE POLYMERS INTO THE NIP BETWEEN A PAIR OF FLEXIBLE CONTINUOUS METAL BELTS, HEATING THE MATERIAL AT LEAST TO THE SOFTENING TEMPERATURE OF SAID POLYMERIC MATERIAL IN A FIRST HEATING ZONE, CONTINUOUSLY MOVING THE HEATED MATERIAL TO ASECOND ZONE WHILE DENSIFYING THE MATERIAL, COOLING THE MATERIAL IN THE DENSIFIED STATE TO A TEMPERATURE BELOW THE SOFTENING TEMPERATURE OF THE POLYMERIC MATERIAL, WHILE CONTINUOUSLY REMOVING THE DENSIFIED MATERIAL FROM THE DENSIFYING ZONE AND COOLING THE SHEET THUS PRODUCED TO ROOM TEMPERATURE WHEREIN SAID INTRACTABLE POLYMERS HAVE A MOLECULAR WEIGHT OF AT LEAST ABOUT 1000,000 AND A MELT INDEX NOT EXCEEDING ABOUT 1.4 AT 22 LBS./10MIN. AT 190*C. AND WHEREIN SAID HEAT SENSITIVE POLYMERS UNDERGO AN IRREVERSIBLE MEASURE OF DEGRADATION OF AT LEAST ONE OF THEIR PHYSICAL PROPERTIES WHEN SUBJECTED TO AT LEAST THEIR SOFTENING TEMPERATURES FOR A PROLONGED PERIOD OF TIME.