Most thermoplastics can be blown to produce blown plastic film. The blow molding factory produces plastic film by kneading the plastic into a thin tube, then blowing the plastic with compressed air while it is hot, and then cooling and shaping it to obtain a cylindrical plastic film product. The properties of this type of plastic film are between oriented film and cast film: the compressive strength is better than that of cast film, and the heat sealing performance is worse than that of cast film. There are many types of plastic films produced by blow molding factories, such as low-density polyethylene, pp polypropylene, high-density polyethylene, polyester, butadiene-butadiene formate polymer, etc. Here, the editor of Kunshan Juxinchang Company will give a relatively simple explanation of the blow molding production process of common low-density polyethylene films.

Raw materials for the production of polyethylene film in blow molding plants:
1. The raw materials used should be blown film grade polyethylene resin particles with appropriate lubricants to ensure the opening of the plastic film.
2. The melt index of epoxy resin particles cannot be too large. If the melt index is too large, the viscosity of the molten epoxy resin is very small, the processing range is narrow, the processing conditions cannot be controlled, the film-forming ability of the epoxy resin is poor, and it is not easy to process into a film;
In addition, if the melt index is too large, the molecular weight distribution of the polymer is too narrow, and the compressive strength of the film is weak.
Therefore, epoxy resin materials with a small melt index and a wide molecular weight distribution should be used, which can meet the performance requirements of the film and ensure the processing characteristics of the epoxy resin. Blown polyethylene film generally uses polyethylene materials with a melt index between 2 and 6 g/10min.
Key points of production process control in blow molding plants:
The production process of blow molding film in blow molding plants is roughly as follows:
Feeding from silo → Melting and extruding of raw materials → Inflating traction belt → Air ring cooling → Herringbone clamping plate → traction roller traction belt → Corona treatment → Film unwinding
However, the editor of Kunshan Juxinchang Company believes that it is particularly important to note that the properties of blow molding film are closely related to the production process parameters of blow molding plants. Therefore, in the process of film blowing, it is necessary to improve the control of process parameters, standardize process operation, ensure the smooth progress of production, and obtain high-quality film products.