Blow molding film processing wholesale process is generally as follows:

Hopper feeding → Plasticizing extrusion → Blowing and stretching → Air ring cooling → Vee-shaped clamp → 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 film blowing process, it is essential to strengthen the control of 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 main aspects of process parameter control include:

Extruder temperature

When extruding low-density polyethylene (LDPE) film for blow molding, the extrusion temperature is generally maintained between 160℃ and 170℃, and it is essential to ensure uniform die temperature. Excessive temperature can lead to resin decomposition and脆f film, particularly reducing the longitudinal tensile strength; whereas, too low a temperature results in poor resin plasticization, preventing smooth expansion and stretching. The film will have lower tensile strength and poor surface luster and transparency, possibly even exhibiting 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 and, in essence, is a form of lateral stretching that 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 instability in the film bubble and an increased likelihood of creases. Therefore, it should be properly matched with the draw ratio. Generally, for low-density polyethylene (LDPE) film, the blow-up ratio should be controlled between 2.5 and 3.0.

Blow molding wholesale products generate pollutants.

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