Blow molding film processing wholesale typically follows this general workflow:

Hopper feeding → Plasticizing extrusion → Blowing and stretching → Air ring cooling → V-shaped clamp → 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 film blowing process, it is essential to strengthen the control of process parameters, standardize process operations, and ensure the smooth progress of production and the obtainment of high-quality film products. In the production of polyethylene blow molding wholesale films, the main focus is on controlling the following process parameters:

Extruder temperature

During blow molding 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 temperature can lead to resin decomposition and脆 film, particularly causing a significant drop in longitudinal tensile strength; whereas, if the temperature is too low, the resin will not be properly plasticized, preventing smooth expansion and stretching, resulting in lower tensile strength of the film, poor surface luster and transparency, and even the appearance of wood grain patterns and unmelted crystal nuclei (fish eyes).

2. Blowing Ratio

Blow-up ratio is one of the key control points in the blowing film production process for wholesale film manufacturing, 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 induces a certain degree of orientation in the plastic molecules. As the blow-up ratio increases, it enhances the film's lateral strength. However, the blow-up ratio should not be too high, as it can lead to instability in the film bubble 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 emit a small amount of organic waste gas due to high temperatures, primarily consisting of non-total hydrocarbons.