Blow molding film processing wholesale process generally includes the following steps:

Hopper feeding one material → plasticizing extrusion → blow molding and drawing → air ring cooling → V-shaped clamp → pull roller traction → corona treatment → film winding

However, it is worth noting that the performance of blown film in blow molding processing wholesale is greatly related to the production process parameters. Therefore, during the film blowing process, strict control over process parameters is essential, along with standardized operation to ensure smooth production and the achievement of high-quality film products. In the production of polyethylene blown film processing wholesale, 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℃, and it is crucial to ensure uniform die head temperature. Excessive temperature can cause resin decomposition, resulting in brittle film with significantly reduced longitudinal tensile strength. On the other hand, too low a temperature leads to poor resin plasticization, preventing smooth expansion and stretching, resulting in lower film tensile strength and reduced surface luster and transparency. Moreover, wood grain-like patterns and unmelted crystalline nuclei (fish eyes) may appear.

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, 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 film bubble and the film may develop wrinkles. Therefore, the blow-up ratio 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 wholesale products generate pollutants.

During the blow molding and wholesale processing, plastic granules volatilize at high temperatures, producing a small amount of organic waste gas, primarily consisting of non-total hydrocarbons.