Blow molding film processing wholesale process is generally as follows:

Hopper feeding of 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 wholesale films is greatly related to the production process parameters. Therefore, during the film blowing process, strict control over process parameters must be maintained, standardized process operations must be followed, to ensure smooth production and obtain high-quality film products. In the production of polyethylene blow molding wholesale films, the main controls over the following process parameters should be implemented:

Extruder temperature

During blow molding processing of 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, making the film brittle and significantly reducing its longitudinal tensile strength; conversely, too low a temperature results in poor resin plasticization, preventing smooth expansion and stretching. The film's tensile strength is lower, and its surface luster and transparency are poor, possibly developing wood grain-like patterns and unmelted crystal nuclei (fish eyes).

2. Blowing Ratio

Blow-up ratio is one of the key controls in the production process of blown film for blow molding wholesale, referring to the ratio of the diameter of the blown 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, increasing the lateral strength of the film as the blow-up ratio rises. However, the blow-up ratio should not be too high, as it can lead to unstable bubbles and the film may wrinkle easily. Therefore, the blow-up ratio should be appropriately 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' generated 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.