The blowing film process in plastic extrusion processing is generally as follows:

Hopper feeding one material → plasticizing extrusion → blow-molding 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 processing wholesale films is greatly related to the production process parameters. Therefore, during the blowing process, it is necessary to strengthen the control of process parameters, standardize process operations, ensure the smooth progress of production, and obtain high-quality film products. In the production process of polyethylene blow molding processing wholesale films, the main focus is on controlling the following process parameters:

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 film, particularly causing a significant drop in longitudinal tensile strength; conversely, if the temperature is too low, the resin will not plasticize properly, preventing smooth expansion and stretching, resulting in lower film tensile strength. Additionally, the surface will have poor luster and transparency, and may even exhibit patterns resembling wood grain and unmelted crystalline 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 bubble after blowing 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 bubble and the film may wrinkle easily. Therefore, the blow-up ratio should be appropriately matched with the draw ratio. Generally, for low-density polyethylene (LDPE) film, the blow-up ratio should be controlled between 2.5 and 3.0.

Blow molding wholesale products generate pollutants.

During the blow molding processing and wholesale processing, plastic pellets volatilize at high temperatures, producing a small amount of organic waste gas, the main component of which is non-total hydrocarbons.