Blow molding film processing wholesale process is generally as follows:

Hopper feeding one material → Plasticizing extrusion → Blowing and stretching → Air ring cooling → V-plate → Roller traction → Corona treatment → Film winding

However, it is worth noting that the performance of blow molding processed bulk film is greatly related to the production process parameters. Therefore, during the blowing process, strict control of process parameters is essential, standardized process operations must be implemented, and the smooth progress of production must be ensured to obtain high-quality film products. In the production of polyethylene blow molding bulk film, the main focus is on controlling the following process parameters:

Extruder temperature

During the blow molding process of low-density polyethylene (LDPE) film, the extrusion temperature is typically maintained between 160℃ and 170℃, and it is crucial to ensure uniform die head temperature. Excessive extrusion temperature can lead to resin decomposition and脆 film, particularly causing a significant drop in longitudinal tensile strength; whereas, too low a temperature results in poor resin plasticization, preventing smooth expansion and stretching, resulting in lower film tensile strength, reduced 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, essentially being the lateral stretching of the film, which 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 may lead to unstable film bubbles and more frequent creases in the film. Therefore, the blow-up ratio should be properly coordinated with the draw ratio. Generally speaking, the blow-up ratio for low-density polyethylene (LDPE) film should be controlled between 2.5 and 3.0.

Blow molding processed wholesale products' pollutants

During the blow molding processing and wholesale manufacturing process, the plastic pellets emit a small amount of organic waste gas due to high temperatures, primarily composed of non-total hydrocarbons.