The blow molding processing wholesale film production process is generally as follows:

Hopper feeding one material → plasticizing extrusion → blow-molding and stretching → wind ring cooling → V-shaped clamp → traction 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, ensure the smooth progress of production, and obtain 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 processing 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 cause resin decomposition, making the film brittle, especially leading to a significant drop in longitudinal tensile strength; too low temperature results in poor resin plasticization, preventing smooth expansion and stretching, with the film having lower tensile strength and poor surface luster and transparency. Additionally, it may exhibit patterns resembling wood grain 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 manufacturing, 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 process. This stretching exerts a certain degree of orientation on the plastic molecules, increasing the film's lateral strength as the blow-up ratio rises. However, the blow-up ratio should not be too high, as it can lead to instability in the bubble and cause the film to wrinkle easily. Therefore, it should be properly 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 produce pollutants.

During the blow molding and wholesale processing, plastic granules volatilize at high temperatures, producing a small amount of organic waste gas, the main component of which is non-total hydrocarbons.