A hollow blow molding process and a mold mainly comprise the following steps: A. Blanking: the discharge head of the blow molding machine extrudes a hollow parison, and the inner cavity of the parison precontains naturally entered air; B. Molding: the parison is sent into the blow molding mold, the pre-compression mold in the blow molding mold closes first to extrude the parison outside the molding mold of the blow molding mold, and the gas in the inner cavity of this part of the parison is extruded into the parison in the molding mold; the mold closing is continued, the molding mold in the blow molding mold closes, excess parts are cut off, and a closed hollow product is formed. In the present invention, the parison contains gas during blanking, all gas is extruded into the molding part during pre-compression, and then molding is performed. Therefore, no air needle is needed to blow gas during the blow molding process, so no air hole is left on the hollow product. In addition, this gas extrusion method makes the wall thickness of the hollow product uniform and improves the quality of the hollow product.
Country Code: CN
Application Number: CN201310318258.1
