Blow molding film processing wholesale process generally includes:

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

However, it is worth noting that the performance of blown film processing wholesale films is greatly related to the production process parameters. Therefore, during the blowing film process, it is necessary to strengthen the control of process parameters, standardize the process operation, ensure the smooth progress of production, and obtain high-quality film products. In the production process of polyethylene blown film processing wholesale films, the control of the following process parameters is primarily focused on:

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脆化的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. The film's tensile strength is lower, and its surface luster and transparency are poor, sometimes even exhibiting patterns resembling wood rings 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 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 stretching of the film. This stretching exerts a certain degree of orientation on the plastic molecules, with an increased blow-up ratio enhancing 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 creases in the film. Therefore, the blow-up ratio 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 and wholesale processing, plastic granules produce a small amount of organic waste gas due to high temperatures, with the main component being non-total hydrocarbons.