The basic information
Blow molding machine, also known as hollow blow molding machine, a kind of rapid development of plastic processing methods. Thermoplastic resin by extrusion or injection molding of plastic parison tube, hot (or heated to softening state), put in split cavity, mold closing immediately after ventilation with compressed air within the parison, make plastic parison swell and clingy wall in the mold, the cooling mold release, the products have all kinds of hollow. Blown film manufacturing technology on the principle and hollow blow molding is very similar, but it does not use the mould, from the perspective of classification of plastics processing technology, molding process is usually included in the extrusion of blown film. Blow molding process during the second world war, start small bottles used in the production of low density polyethylene. Late 50 s, with the birth of the high density polyethylene ?