The Blow Molding Process Of A Blow Molding Machine

In the production process of blown film, the uniformity of film thickness is a crucial indicator. The longitudinal uniformity of film thickness can be controlled by the stability of extrusion and traction speed, while the transverse uniformity of film thickness generally depends on the precision manufacturing of the die head and changes with the production process parameters. In order to improve the transverse uniformity of film thickness, an automatic transverse thickness control system must be introduced. Common control methods include automatic die head (thermal expansion screw control) and automatic air ring. This article mainly introduces the principle and application of automatic air ring.