Home > Knowledge > Content
Blow moulding,Plastic processing
- Apr 11, 2018 -

Blow molding is also called hollow blow molding, a 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. The blow molding process was used in the production of low density polyethylene bottles during world war ii. In the late 1950s, with the birth of high density polyethylene and the development of blow molding machine, blow molding technology was widely used. The volume of hollow containers can reach thousands of litres, and some of them have been computerized. It is suitable for blowing plastic with polyethylene, polyvinyl chloride, polypropylene, polyester, etc., and the empty container is widely used as an industrial packaging container.
According to the method of moulding, blow molding can be divided into extrusion blow molding and injection blow molding, new development of multi-layer blowing and stretching blow molding.