PREPARATION OF SINGLE SURFACE MAT POLYCARBONATE FILM

• Main Authors: SUGIMURA YOSHIHIRO, TANAKA TATSU
• Format: Patent
• Language: English
• Published: 17.03.1989
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PURPOSE:To obtain a good single surface mat polycarbonate film, by pressing polycarbonate extruded under melting at specific temp. under specific line pressure using a cooling mirror surface roll and a guide roll made of heat resistant silicone rubber whose surface roughness in the directions parallel and vertical to the surface thereof and surface hardness are specific. CONSTITUTION:The molten polycarbonate 3 extruded from an extrusion die 4 is guided between a mirror surface cooling roll 1 set to a line pressure range of 1-5kg/cm and a polished matted guide roll 2 made of hard silicone rubber within a resin temp. range of 170-200 deg.C. The molten polycarbonate on the side of the guide roll 2 receives pressure in a semi-molten state to erase die lines and the surface mat pattern of the guide roll is transferred to said polycarbonate. The molten polycarbonate brought into contact with the cooling roll 1 receives the transfer of the mirror surface of the mirror surface cooling roll and cooled. By this method, a good single surface mat polycarbonate film can be obtained.