PRODUCTION OF DOUBLE THERMOPLASTIC POLYESTER RESIN LAMINATE STEEL PLATE SUPERIOR IN ADHESION AND PROCESSABILITY

摘要

PURPOSE: To obtain a production of double thermoplastic polyester resin laminate steel plate superior in adhesion and processability. ;CONSTITUTION: A thermoplastic polyester resin is laminated on each surface of a steel plate 2 by a T-die extrusion method. In the T-die extrusion laminate process, the resin is laminated on one surface by a part 5 after the resin is laminated on the other surface by a part 4 and, at this time, the temperature of the steel plate is set to be from 100 to 150°C. The obtained double laminate steel plate is again heated by a part 6 at a temperature from 160-230°C for a time from 2 to 20 sec and immediately cooled by a part 7. In this manner, by conducting the second laminate process at a temperature of 150°C or lower, the thermoplastic polyester resin film laminated in the first process is prevented from being flawed by a rear-surface roll during the second laminate process. By again heating the laminate after the double laminate process, the adhesion of the laminate film with the steel plate is improved.;COPYRIGHT: (C)1993,JPO&Japio