EXTRUSION-MOLDING MACHINE AND EXTRUSION-MOLDING METHOD

摘要

An extrusion-molding machine includes a screw, a die and a high-hardness coat layer. The screw has a blade portion to extrude a molding material. The screw is disposed in a tightly-closed space which is maintained in a reduced-pressure atmosphere. The die molds an extruded molding material. The high-hardness coat layer is provided at least on the blade portion.