Blow molding film processing wholesale process is generally as follows:

Hopper feeding 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 blow molding processed wholesale film is greatly related to the production process parameters. Therefore, during the blowing film process, it is essential 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 processed wholesale film, the control of the following process parameters is primarily focused on:

Extruder temperature

During blow molding processing of low-density polyethylene (LDPE) film, the extrusion temperature is generally maintained between 160℃ and 170℃, and it is essential to ensure uniform die head temperature. Excessive extrusion temperature can lead to resin decomposition and脆化的film, particularly a significant decrease 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 a 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 blowing film for wholesale plastic processing, referring to the ratio of the diameter of the bubble after inflation to the diameter of the un-inflated 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 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 bubble and the film may wrinkle easily. Therefore, it 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.

Blow molding processed products wholesale pollution

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