Automotive Parts

Blow molding film processing wholesale generally follows this workflow:

Hopper feeding one material → 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 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, and ensure smooth production and the production of 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 of low-density polyethylene (LDPE) film, the extrusion temperature is typically maintained between 160℃ and 170℃, and it is essential to ensure uniform die head temperature. Excessive extrusion temperature can lead to resin decomposition and脆 film, particularly a significant decrease in longitudinal tensile strength; on the other hand, too low a temperature results in poor resin plasticization, inability to smoothly expand and stretch, lower tensile strength of the film, and poor surface gloss and transparency. In extreme cases, it may even exhibit 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 film 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 of the film. This stretch exerts a certain degree of orientation on the plastic molecules, and 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 cause the film to wrinkle easily. Therefore, the blow-up ratio should be appropriately 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 and wholesale processing, plastic granules volatilize due to high temperatures, producing a small amount of organic waste gas, mainly composed of non-total hydrocarbons.