Warm Global Customers
With China Plastic Machinery
With China Plastic Machinery
Blown film extrusion is a method for continuous film production of thermoplastics. It is a molding method widely used in the preparation of polyethylene, polypropylene, and polyvinyl chloride plastic films.
Blown film extrusion is a molding process in which the thermoplastic is melted and plasticized by an extruder, and then extruded into a tube through a ring die. At the same time, the compressed air injected into the tube is further inflated to form a continuous thin-walled cylinder, and then cooled by an air ring device, and then compressed, pulled, and wound with a clamping roller to obtain a cylindrical film product.
The blown film extrusion method has compact equipment, the film thickness can be controlled by the amount of air, and the operation is simple. In addition, there is a certain degree of biaxial stretching during the molding process, so that the finished product strength can be higher, but the film thickness deviation is large.
The plastic is first made into a bottomed parison by injection molding, and then the parison is moved to the blow mold and blown into a hollow product.
Stretch blow molding is a type of blow molding with biaxial directional stretching. The method is to first stretch the parison longitudinally and then use compressed air to inflate it to achieve transverse stretching. Stretch blow molding can greatly improve the transparency, impact strength, surface hardness and rigidity of the product, and is suitable for blow molding of polypropylene and polyethylene terephthalate (PETP). Stretch blow molding includes injection parison directional stretch blow molding, extrusion parison directional stretch blow molding, multi-layer directional stretch blow molding, compression molding directional stretch blow molding, etc.
The plastic is first made into a bottomed parison by extrusion, and then the parison is moved to the blow mold and blown into a hollow product. The difference between injection blow molding and extrusion blow molding is the method of making the parison, but the blow molding process is basically the same. In addition to the injection machine and extruder, the blow molding equipment is mainly the mold for blow molding. The blow molding mold is usually composed of two pieces, with a coolant channel and a small hole on the parting surface for inserting the pressurized air blow pipe.
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