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Blow molding film processing wholesale process is generally as follows:

Hopper feeding → 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 bulk film is greatly related to the production process parameters. Therefore, during the blowing process, strict control over the process parameters must be ensured, standardized operational procedures must be followed, and the smooth production process must be guaranteed to obtain high-quality film products. In the production of polyethylene blow molding bulk film, the control of the following process parameters is particularly important:

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 temperature can cause resin decomposition, making the film brittle and significantly reducing its longitudinal tensile strength; on the other hand, insufficient temperature leads to poor resin plasticization, preventing smooth expansion and stretching. The film's tensile strength is lower, and its surface luster and transparency are poor, with potential wood grain-like 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 frequent wrinkling of the film. Therefore, the blow-up ratio should be appropriately matched 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.

Blow molding wholesale products generate pollutants.

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