Explanation

Also called hollow blow-molding. blow-molding is a molding method for manufacturing hollow plastics products. It is a molding technology that uses gas pressure to blow the closed parison in the rubber state in the mold cavity into hollow products. According to different parison manufacturing methods, it can be divided into extrusion blow molding and injection blow molding. extrusion blow molding uses an extruder to vertically extrude molten tubular billets, and the blow molding mold clamps the billets through blowing, pressure maintaining, cooling, and exhaust to open the mold and take out the parts. In injection blow molding, the parison is first molded on the mandrel of the mold, and then the mandrel and the hot parison are automatically moved into the blowing mold. After blowing, cooling, shaping, and venting, the mold is opened and the parts are taken out. The extrusion blow molding equipment has low cost and is widely used for forming various packaging containers, bottles, pots, barrels, etc. injection blow molding products have high precision, especially the thread quality of the bottle mouth is good. They are often used in small and medium-sized containers such as molded medicine bottles and cosmetic packaging bottles, but the cost is high. Thermoplastic plastics used for blow-molding include PE, PP, PVC, polyester, PA, PC, etc.

Classification