Blow molding film processing wholesale generally follows this workflow:

Hopper feeding of one material → plasticizing extrusion → blow molding and stretching → air ring cooling → V-blade cooling → draw roll traction → corona treatment → film winding

However, it is worth noting that the performance of blown film processing wholesale films is greatly related to the production process parameters. Therefore, during the blowing film process, it is essential to strengthen the control over process parameters, standardize process operations, and ensure smooth production and the production of high-quality film products. In the process of producing polyethylene blown film processing 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 generally maintained between 160℃ and 170℃, and it is crucial to ensure uniform head temperature. Excessive extrusion temperature can cause resin decomposition and make the film brittle, particularly reducing the longitudinal tensile strength significantly; conversely, if the temperature is too low, the resin plasticization is poor, and the film cannot be smoothly expanded and stretched, resulting in lower tensile strength, 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 production process of blown film for blow molding wholesale, 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, which is essentially a lateral stretching of the film. This stretching 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 wrinkles in the film. Therefore, the blow-up ratio should be properly coordinated with the draw ratio. Generally, the blow-up ratio for low-density polyethylene (LDPE) film should be controlled between 2.5 and 3.0.

Wholesale products from blow molding processing generate pollutants.

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