Blow molding film processing wholesale typically follows this general process:

Hopper feeding → material plasticizing extrusion → blowing and stretching → wind ring cooling → V-blade cooling → traction 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, 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 of polyethylene blow molding bulk film, the main focus is on controlling the following process parameters:

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 die head temperature. Excessive temperature can lead to resin decomposition and脆ness in the film, particularly a significant drop in longitudinal tensile strength; conversely, if the temperature is too low, the resin does not plasticize properly, preventing smooth expansion and stretching, resulting in lower tensile strength of the film. Additionally, the surface will have poor luster and transparency, and may exhibit patterns resembling wood rings 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 plastic processing wholesale, referring to the ratio between the diameter of the blown bubble and the diameter of the unblown tube ring. The blow-up ratio represents the lateral expansion multiple of the film, which is essentially a lateral stretch of the film. This stretch exerts an orientation effect on the plastic molecules, and as the blow-up ratio increases, it enhances the film's lateral strength. However, the blow-up ratio should not be too high, as it may cause instability in the bubble and lead to wrinkles in the film. 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, a small amount of organic waste gas is produced due to the evaporation of plastic pellets at high temperatures.