Fuel Tank

Blow molding film production process for wholesale generally includes:

Hopper feeding → Plasticizing extrusion → Blowing and stretching → Air ring cooling → V-shaped plate → 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 over process parameters, standardize operational procedures, and ensure smooth production to obtain high-quality film products. In the production of polyethylene blow molding processed wholesale film, the main aspects of process parameter control include:

Extruder temperature

During the blow molding process of low-density polyethylene (LDPE) film, the extrusion temperature is generally maintained between 160℃ and 170℃, with the requirement for uniform head temperature. Excessive extrusion temperature can lead to resin decomposition and脆化 film, especially a significant decrease in longitudinal tensile strength; whereas, too low a temperature results in poor resin plasticization, preventing smooth expansion and stretching, with lower tensile strength of the film and poor surface gloss and transparency. In extreme cases, it can even exhibit patterns resembling the rings of a tree trunk and unmelted crystalline nodules (fish eyes).

2. Blowing Ratio

Blow-up ratio is one of the key control points in the blow molding process of wholesale film production, referring to the ratio of the diameter of the film bubble after blowing 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 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 may lead to instability in the film bubble and cause wrinkles in the film. Therefore, it should be coordinated with the draw ratio appropriately. 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 processing, plastic pellets may emit a small amount of organic waste gas due to high temperatures, with the main component being non-total hydrocarbons.