Blow molding film processing wholesale process generally includes:

Hopper feeding one material → Plasticizing extrusion → Blowing and stretching → Air ring cooling → V-shaped plate → Roller traction → Corona treatment → Film winding

However, it is worth noting that the performance of blow molding processing wholesale films is greatly related to the production process parameters. Therefore, during the blowing film process, it is essential to strengthen control over process parameters, standardize process operations, and ensure smooth production and the obtainment of high-quality film products. In the production of polyethylene blow molding processing wholesale films, the following process parameters must be well controlled:

Extruder temperature

During the blow molding process for low-density polyethylene (LDPE) film, the extrusion temperature is typically maintained between 160℃ and 170℃, ensuring uniform die head temperature. Excessive extrusion temperature can lead to resin decomposition and脆 film, particularly reducing the longitudinal tensile strength significantly; conversely, if the temperature is too low, the resin plasticization is poor, 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 crystalline 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 film 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 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 film's lateral strength. However, the blow-up ratio should not be too high, as it can lead to unstable film bubbles and an increased tendency for the film to wrinkle. 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' generated pollutants

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