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

Hopper feeding of one material → Plasticizing extrusion → Blowing and stretching → Air ring cooling → V-shaped clamp → 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 main focus is on controlling the following process parameters:

Extruder temperature

During blow molding and wholesale of 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, too low a temperature results in poor resin plasticization, preventing smooth expansion and stretching, resulting in lower film tensile strength, reduced surface luster and transparency, and possibly even wood grain-like 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 film processing, referring to the ratio of the diameter of the bubble after blowing 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, the lateral strength of the film is enhanced. However, the blow-up ratio should not be too high, as it can lead to unstable bubbles and frequent wrinkling of the film. 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 wholesale products generate pollutants.

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