Blow molding film processing wholesale generally follows this workflow:

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 blown film in blow molding processing wholesale is greatly related to the production process parameters. Therefore, strict control over process parameters must be ensured during the blowing process, standardized operation of the process, to guarantee the smooth progress of production and obtain high-quality film products. In the production of polyethylene blown film for wholesale processing, the control of the following process parameters is mainly focused on:

Extruder temperature

During the blow molding process for 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脆化的film, particularly a significant decrease in longitudinal tensile strength; whereas, too low a temperature results in poor resin plasticization, preventing smooth expansion and stretching. The film's tensile strength is lower, and its surface luster and transparency are poor, sometimes even exhibiting wood grain patterns and unmelted crystal nuclei (fish eyes).

2. Blowing Ratio

Blow-up ratio is one of the key controls in the production process of blown film for blow molding wholesale, referring to the ratio of the diameter of the blown film bubble to the diameter of the unblown tube ring. The blow-up ratio represents the lateral expansion multiple of the film, which is essentially a lateral stretch of the film. This stretch exerts a certain degree of orientation on the plastic molecules, and as the blow-up ratio increases, it enhances the film's lateral strength. However, the blow-up ratio should not be too high, as it may cause instability in the film bubble and lead to wrinkles in the film. Therefore, it should be properly coordinated with the draw ratio. Generally, 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 processing and wholesale manufacturing, plastic pellets produce a small amount of organic waste gases due to high temperatures, primarily consisting of non-total hydrocarbons.