The basic knowledge science of China extrusion blow molding machine

Blow moulding, also known as blow molding, is a rapidly evolving plastic processing method. The tubular plastic parison obtained by extrusion or injection molding of thermoplastic resin is heated (or heated to a softened state) and placed in a split mold. Immediately after closing the mold, compressed air is introduced into the parison to blow the plastic parison. It is inflated and adhered to the inner wall of the mold, and is cooled and demolded to obtain various hollow products. The manufacturing process of the blown film is very similar in principle to the blow molding of hollow products, but it does not use a mold. From the perspective of classification of plastic processing technology, the molding process of the blown film is usually included in the extrusion. The blow molding process began 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. Hollow containers can be up to several thousand liters in volume, and some have been computer controlled. The plastics suitable for blow molding are polyethylene, polyvinyl chloride, polypropylene, polyester, etc., and the resulting hollow blow molding machine is widely used as an industrial packaging container.