Gel particles, also known as "fish eyes," are caused by unplasticized polymer granules within the blown film. The molecular weight of these gel particles is significantly higher than that of the surrounding PE matrix.

The primary causes are:

① Unplasticized Resin: Inconsistent control during the production of the base resin can result in a portion of the resin having an excessively high molecular weight, which cannot be plasticized under standard processing conditions.

② Residual Catalyst: An excessive amount of residual catalyst in the raw resin can continue to promote polymerization within the high-temperature environment of the film blowing machine's barrel and screw, forming ultra-high molecular weight polymers. Therefore, selecting high-quality raw materials is crucial.

Following the film blowing process, the film is cut to produce T-shirt bags.

The process is straightforward, with corresponding machinery for each step:
Plastic pellets are first plasticized by an extruder. This molten plastic is then fed into the film blowing machine where it is inflated into a thin, tubular film. This tubular film is subsequently directed to a T-shirt bag making machine, which cuts it into the required shape and heat-seals the bottom.