Blow molding film processing wholesale process generally includes:

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

However, it is worth noting that the performance of blow molding processed wholesale film is greatly related to the production process parameters. Therefore, during the blowing process, it is essential to strengthen the control of process parameters, standardize operational procedures, ensure the smooth progress of production, and obtain high-quality film products. In the production of polyethylene blow molding processed wholesale film, the main aspects of process parameter control include:

Extruder temperature

During the blow molding process of low-density polyethylene (LDPE) film, the extrusion temperature is generally 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 a significant decrease in longitudinal tensile strength; conversely, 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 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 an orientation effect 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 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 speaking, the blow-up ratio for low-density polyethylene (LDPE) film should be controlled between 2.5 and 3.0.

Wholesale products from blow molding processing generate pollutants.

During the blow molding and wholesale processing, plastic granules volatilize a small amount of organic waste gas due to high temperatures, mainly composed of non-total hydrocarbons.