POLYPROPYLENE COMPOSITE SHEET AND BLOW MOLDING METHOD USING THE SHEET

摘要

PROBLEM TO BE SOLVED: To mold integrally with a skin material such as cloth and film by providing a blow molding machine constituted of an extruder and a press molding machine, wherein defects of requiring a large-scale equipment investment and also of the limited capability to resin molding only can be eliminated. SOLUTION: Polypropylene composite sheets containing polyester fibers or mixed fibers of polyester and cotton at the ratio of 2:1-9:1 to polypropylene are laminated in a mold which is set in a hot melt press molding machine to carry out a primary molding, and air is filled among composite sheets and passed through therein for a given time to mold a hollow molded product.