What is the process of producing film in a blow molding factory

Most thermoplastic materials can be produced by blow molding to produce blow molded plastic films. Blow molding factories produce plastic films by kneading the plastic into thin tubes, then inflating the plastic with air compression while it is hot, and finally cooling and shaping it to obtain cylindrical plastic film products. The characteristics of this type of plastic film are intermediate between oriented film and cast film: the compressive strength is better than cast film, and the heat sealing performance is worse than cast film. There are many types of plastic films produced and manufactured by blow molding factories, such as low-density polyethylene, PP polypropylene, high-density polyethylene, polyester, butadiene formic acid butadiene polymer, etc. Here, the editor of Kunshan Juxinchang Company will briefly explain the blow molding production process of common low-density polyethylene films.

Raw materials for producing polyethylene film in blow molding factories:

The raw material 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 should not be too high. If the melt index is too high, the viscosity of the melted epoxy resin will be very low, the production and processing scope will be narrow, the production and processing standards will be uncontrollable, and the film-forming ability of epoxy resin will be poor, making it difficult to produce and process films;

In addition, the melt index is too high, the relative molecular weight distribution of the polymer is too narrow, and the compressive strength of the plastic film is weak.

Therefore, epoxy resin raw materials with lower melt index and wider relative molecular weight distribution should be used, which can consider the characteristics of plastic film and ensure the production and processing characteristics of epoxy resin. Blow molded polyethylene film generally uses polyethylene raw materials with a melt index in the range of 2-6g/10min.

Key points for manipulating the production process flow of blow molding factories:

The production process of blow molded plastic film in blow molding processing plants is roughly as follows:

Material silo feeding → raw material melting and extrusion → inflation traction belt → air ring cooling → herringbone clamp → traction belt roller traction belt → corona treatment → plastic film unwinding

However, the editor of Kunshan Juxinchang Company believes that the characteristics of blow molded plastic film are closely related to the main parameters of the production process of the blow molding factory. Therefore, it is necessary to enhance the control of the main parameters of the processing technology during the entire blown film process, standardize the actual operation of the processing technology, ensure the smooth development of production and manufacturing, and obtain high-quality plastic film products.