Blow molding film processing wholesale process is generally as follows:

Hopper feeding one material → Plasticizing extrusion → Blowing and stretching → Air ring cooling → V-plate → 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 control over the process parameters, standardize operational procedures, ensure smooth production, and obtain high-quality film products. In the production of polyethylene blow molding processed wholesale film, the following process parameters need to be controlled primarily:

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 extrusion temperature can lead to resin decomposition and脆 film, particularly causing a significant drop in longitudinal tensile strength; conversely, if the temperature is too low, the resin will not plasticize properly, preventing smooth expansion and stretching, resulting in lower film tensile strength, poor surface luster 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 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, 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 the film may wrinkle easily. 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 and wholesale processing, plastic pellets generate a small amount of organic waste gas due to high temperatures, primarily consisting of non-total hydrocarbons.