OLEFIN RESIN FOAMED SHEET, APPARATUS AND METHOD FOR MANUFACTURING IT

摘要

PROBLEM TO BE SOLVED: To provide an apparatus and a method for manufacturing an olefin resin foamed sheet which has a flat surface with no scoreline called corrugation and is thin and can be molded at a high speed. SOLUTION: A molten olefin resin containing a foaming agent is extruded from a die and is brought into contact with an intermediate roll in the neighborhood of starting of air bubbles appearance and foaming is finished on the intermediate roll or foaming is finished to the extent where corrugation can be prevented from being generated by a tension between the intermediate roll and a cooling roll and thickness of the sheet ia made thin by this tension. Thereafter, it is solidified by cooling by means of an air knife device and the cooling roll and is taken off.