Thermoplastic resin extrusion or injection molding of the tubular plastic billet, while hot (or heated to soften the state), placed in the split mold, closed immediately after the billet into the compressed air, the plastic billet blowing and close to the inner wall of the mold, after cooling stripping, that is, a variety of hollow products. Blow molding film manufacturing process in principle and hollow products blow molding is very similar, but it does not use a mold, from the perspective of plastic processing technology classification, blow molding film molding process is usually included in the extrusion. The blow molding process began to be used to produce low density polyethylene vials during the Second World War. In the late 1950s, with the birth of high-density polyethylene and the development of blow molding machines, blow molding technology was widely used. The volume of hollow vessels can reach thousands of liters, and some production has been computerized. Suitable for blow molding plastic polyethylene, polyvinyl chloride, polypropylene, polyester, etc., the resulting empty container is widely used as industrial packaging containers.
Post time: Jul-16-2022