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Crystal points are caused by unplasticized polymer particles in the blown film, and the molecular weight of the crystal points is much higher than the molecular weight of the surrounding PE.

① The raw material resin is not strictly controlled during the production process, resulting in a part of the resin having too high a molecular weight and being unable to be plasticized during production.

② There are more residual catalysts in the raw material resin. Under the high temperature of the film blowing machine barrel screw, the catalyst continues to work and form high polymerization degree molecules. Therefore, the selection of raw materials is very important.

After film blowing, the T-shirt bags are cut.
Plastic pellets are plasticized in an extruder and then blown into film in a film blowing machine. The barrel-shaped film is then cut into the desired shape by a T-shirt bag making machine and heat-sealed at the bottom.
The process is simple, and the corresponding machines are available.