EXTRUSION MOLDING OF CURVED MOLDED OBJECT

摘要

PROBLEM TO BE SOLVED: To produce a product high in strength and durability by efficiently molding a curved molded object with high dimensional accuracy by extrusion molding. SOLUTION: The extrusion speed of the raw material from a cap 3 on one end side 3A in the horizontal width direction of the cap is made lower than that on the other end side 3B so that a molded object is extruded so as to be curved toward one end side 3A. Therefore, the extrusion quantity of the raw material becomes much on the other end side high in extrusion speed and becomes little on one end side low in extrusion speed and the extruded molded object is curved toward one end side. By this constitution, a solid or hollow curved molded object useful as a building and civil engineering structural member of every kind is efficiently molded with high dimensional accuracy by extrusion molding and a product high in strength and durability can be produced.