Blow molding film processing wholesale typically follows this general workflow:

Hopper feeding one material → 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 essential to strengthen the control of process parameters, standardize process operations, ensure the smooth progress of production, and obtain high-quality film products. In the process of producing 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℃, with the requirement of uniform head temperature. Excessive extrusion temperature can cause resin decomposition and make the film brittle, particularly reducing the longitudinal tensile strength significantly; on the other hand, too low a temperature results in poor resin plasticization, preventing smooth expansion and stretching, leading to lower tensile strength of the film. Additionally, the film's surface gloss and transparency are poor, and may even exhibit 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 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, and 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 cause wrinkles 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 produce pollutants.

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