The blow molding processing wholesale film production process is generally as follows:

Hopper feeding one material → plasticizing extrusion → blowing and stretching → air ring cooling → V-shaped plate → roller traction → corona treatment → film winding

However, it is worth noting that the performance of blow molding processed wholesale film is greatly related to the production process parameters. Therefore, during the blowing film process, it is essential to strengthen the control of process parameters, standardize process operations, and ensure smooth production and the production of high-quality film products. In the production of polyethylene blow molding processed wholesale film, the main aspects of process parameter control include:

Extruder temperature

During the blow molding process of low-density polyethylene (LDPE) film, the extrusion temperature is generally maintained between 160℃ and 170℃, and it is essential to ensure uniform die head temperature. Excessive extrusion temperature can cause resin decomposition, making the film brittle, particularly reducing the longitudinal tensile strength significantly; conversely, if the temperature is too low, the resin does not plasticize properly, preventing smooth expansion and stretching, resulting in lower film tensile strength, poor surface luster and transparency, and even the appearance of wood grain patterns and unmelted crystal nuclei (fish eyes).

2. Blowing Ratio

Blow-up ratio is one of the key control points in the production process of blown film for plastic processing wholesale, referring to the ratio of the diameter of the film bubble after inflation to the diameter of the un-inflated tube ring. The blow-up ratio represents the lateral expansion multiple of the film and, in essence, is a form of lateral stretching that exerts a certain degree of orientation on the plastic molecules. As the blow-up ratio increases, it enhances the lateral strength of the film. However, the blow-up ratio should not be too high, as it can lead to instability in the film bubble and increased likelihood of wrinkles. Therefore, it should be coordinated with the draw ratio appropriately. Generally speaking, the blow-up ratio for low-density polyethylene (LDPE) film should be controlled between 2.5 and 3.0.

Blow molding wholesale products generate pollutants.

During the blow molding and wholesale processing, plastic granules volatilize at high temperatures, producing a small amount of organic waste gas, primarily composed of non-total hydrocarbons.