EXTRUSION MOLDING DEVICE FOR FOAMABLE SHEET, MANUFACTURE OF FOAMABLE SHEET, AND MANUFACTURE OF FOAM

摘要

PROBLEM TO BE SOLVED: To provide a wide finished product at high productivity by foaming a resin passage with such a section that the part, to the base end of a tip fitment, of the passage is ellipitic and long transversely and gradually becomes circular toward the tip of the resin passage and the longitudinal diameter is 1.1 times or more the transverse diameter in an adapter and further, the part, close to a T-die mounting fitment, of the adapter gradually becomes circular. SOLUTION: An adapter 4 is arranged between the cone recessed tip fitment 1a and the T-die mounting fitment 6 of an extrusion machine for an extrusion molding device. The section of a resin passage running through the described parts of the extrusion machine is of such a shape that the part close to the base end of the cone recessed tip fitment 1a is elliptic and long transversely with the transverse diameter being longer than the longitudinal diameter and the section gradually becomes circular toward the tip of the resin passage with the longitudinal diameter being gradually longer than the transverse diameter. In addition, the resin passage is of such a significantly long longitudinal elliptic shape in the adapter that the longitudinal diameter is 1.1 times or more the transverse diameter and this time, the longitudinal diameter is short and the section gradually becomes circular near the T-die mounting fitment 6 in the adapter 4.