PROCESS FOR PREPARING TRIPLE-WALL DUCT FILLED WITH FOAMING LAYER AND TRIPLE-WALL DUCT PRODUCED BY THE SAME

摘要

PURPOSE: Provided is a triple-wall duct having reduced weight and improved durability compared to existing double or triple wall duct, as well as excellent molding and processing abilities. CONSTITUTION: The triple-wall duct is prepared by an apparatus for performing a process comprising forming a hollow profile from polyethylene resin through a main extrusion device; and, at the same time, filling a foaming layer produced from ethylene vinyl acetate copolymer inside the hollow part through an additional extrusion device.