Blow molding film processing wholesale generally follows this process:

Hopper feeding one material → Plasticizing extrusion → Blowing and stretching → Air ring cooling → V-roller → 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 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 wholesale films, the control of the following process parameters is primarily focused on:

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 extrusion temperature can lead to resin decomposition and脆化 of the film, particularly causing a significant drop in longitudinal tensile strength; whereas, 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, sometimes even exhibiting wood grain 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 bulk molding, referring to the ratio of the diameter of the 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 stretch 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 bubble and the film may wrinkle easily. Therefore, the blow-up ratio should be properly 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 manufacturing, plastic pellets release a small amount of organic waste gas due to high temperatures, mainly consisting of non-total hydrocarbons.