Blow molding film processing wholesale process is generally as follows:

Hopper feeding one material → plasticizing extrusion → blowing and stretching → air ring cooling → V-blade → traction 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, and ensure smooth production as well as high-quality film products. In the production of polyethylene blow molding processed wholesale film, the main focus is on controlling the following process parameters:

Extruder temperature

During blow molding of low-density polyethylene (LDPE) film, the extrusion temperature is typically maintained between 160℃ and 170℃, with the requirement for uniform die head temperature. Excessive extrusion temperature can lead to resin decomposition and脆f film, particularly a significant decrease in longitudinal tensile strength; whereas, 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 control points in the blowing film production process for wholesale film manufacturing, 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 and, in essence, involves stretching the film laterally, which exerts a certain degree of orientation on the plastic molecules. 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 unstable film bubbles and frequent wrinkling of the film. Therefore, it should be properly coordinated with the draw ratio. Generally, 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 processing and wholesale processing, plastic pellets generate a small amount of organic waste gas due to high temperatures, with the main component being non-total hydrocarbons.