METHOD FOR MANUFACTURING INTEGRATED FLOOR-RAISING MATERIAL/DUCT

摘要

This method for manufacturing an integrated floor-raising material/duct has the following steps: a step in which a molten tubular parison is disposed between the two halves of a split mold in an open position; a step in which the two halves of said split mold are moved towards each other to a closed position, thereby flattening the parison, causing the parison to protrude from pinch-off parts, welding the parison together at points corresponding to the pinch-off parts of the mold, and forming a first sealed space corresponding to a first hollow section, a second sealed space corresponding to a second hollow section, and a third sealed space corresponding to a duct section and a pouch of excess material to be discarded; a step in which a blow pin is inserted through the outside surface of the parison section corresponding to each of the aforementioned spaces and a pressurized fluid is injected through said blow pins, thereby expanding the parison, pressing the parison against the surface of the split-mold cavity, and forming the aforementioned first hollow section, second hollow section, and duct section and excess material; and a step in which said excess material is cut off to form an inlet or outlet in the duct section.