RESIN SHEET MOLDING SYSTEM, RESIN SHEET MOLDING METHOD AND PET SHEET MOLDING SYSTEM

摘要

PROBLEM TO BE SOLVED: To solve the conventional problem that increase in manufacturing cost due to the complication of a mold configuration, is unavoidable. ;SOLUTION: In an extrusion device, a raw material resin of a low molecular weight is loaded and polymerized through a polymerization reaction(temperature T₁). Then this polymerized raw material resin is extruded in the form of a sheet and a resin sheet is obtained and further, fed into a molding device. The resin sheet is gradually cooled. In this case, however, the mold face temperature is set at a specified lower temperature level (T₃) than the softening temperature (T₂) of the raw material resin, when the temperature of the sheet is higher than the softening temperature (T₂) in the process of cooling. Under the described mold configuration, the sheet is molded while it is stretched in the mold face direction. Consequently, the degree of crystallization is increased following the stretching of the resin sheet at a higher sheet temperature than the softening temperature (T₂). In this case, it is possible to gradually cool the resin sheet as it is and therefore, dispense with the setting-up of resin sheet cooling facilities. Thus the reduction of manufacturing cost by simplifying the mold configuration is achieved.;COPYRIGHT: (C)2003,JPO