The principle of plastic blow molding machine

The plastic blow molding machine has the advantages of high speed and stable operation. In recent years, it has become one of the main equipment in the production of industrial products. So what is the working principle of the plastic blow molding machine equipment that is so popular with customer manufacturers?

Process overview of plastic blow molding machine

The plastic blow molding process is a rapidly developing plastic processing method. The tubular plastic parison obtained by extrusion or injection molding of thermoplastic resin is placed in the split mold while it is hot, and compressed air is injected into the parison immediately after the mold is closed, so that the plastic parison is inflated and clings to the inner wall of the mold , After cooling and demoulding, various hollow products can be obtained. The manufacturing process of blown film is very similar in principle to blow molding of hollow products, but it does not use molds. From the perspective of plastic processing technology classification, the forming process of blown film is usually included in extrusion.

It should be noted that in the process of blown film production, the uniformity of film thickness is a key indicator, in which the uniformity of longitudinal thickness can be controlled by the stability of extrusion and traction speed, while the uniformity of film transverse thickness generally depends on The die head is precisely manufactured and changes with the change of production process parameters. In order to improve the uniformity of film transverse thickness, an automatic transverse thickness control system must be introduced. The common control method is automatic die head.