| 摘要 |
PROBLEM TO BE SOLVED: To form a thermoplastic resin sheet with fine appearance by preventing fine air bubbles from being mixed in a thermoplastic resin sheet in an extrusion forming method that becomes a leading process in a forming method of a thermoplastic rein sheet. SOLUTION: In forming thermoplastic resin into a sheet by an extrusion machine, molten resin is stayed at the screw tip end of an extrusion machine for feeding out molten resin to a sheet extrusion die, and molten resin is fed out by controlling a feeding quantity of molten thermoplastic resin by the number of screw rotation of the extrusion machine for producing a resin pressure of 10-200 kgf/cm<2> at that time, thereby forming into a sheet. |
