Blow molding film processing wholesale process generally follows this workflow:

Hopper feeding of one material → plasticizing extrusion → blowing and stretching → air ring cooling → V-groove → 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 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 blown film processing wholesale films, it is mainly necessary to control the following process parameters:

Extruder temperature

During blow molding of LDPE (Low Density Polyethylene) 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 of the film, particularly causing a significant drop in longitudinal tensile strength; whereas, if the temperature is too low, the resin will not be properly plasticized, preventing smooth expansion and stretching, resulting in lower tensile strength of the film, poor surface gloss 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 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 cause instability in the film bubble and lead to creases in the film. Therefore, the blow-up ratio should be appropriately matched with the draw ratio. Generally, the blow-up ratio for low-density polyethylene (LDPE) film should be controlled between 2.5 and 3.0.

Wholesale blow molding products produce pollutants.

During the blow molding and wholesale processing, plastic pellets produce a small amount of organic waste gas due to high temperatures, with the main component being non-total hydrocarbons.