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Polyethylene film characteristics and production process
- Sep 08, 2018 -

Polyethylene film, also known as PE film, has good moisture permeability and good moisture permeability, and has good performance and use.


Polyethylene film can be classified into low density, medium density, high density and crosslinked polyethylene according to the manufacturing method and control means.


Low-density polyethylene: its density is about 0.92g/cm3, and its advantages are transparency, hot air performance, moisture-proof and water-proof performance, high tensile strength and large tensile elongation. When drying, the surface temperature of the film should not be too high and should be controlled within 55 degrees. According to the film forming process, it can be divided into three types: blown film, flowing film and low foaming film. The blown film can be used as a food bag and a garment bag. The flowing film can be used as the inner layer of the composite bag and used in On the packaging of cosmetics and pastries.


Medium Density Polyethylene: The density ranges from 0.93 to 0.94 g/cm3 and the performance is between high density and low density polyethylene.


High density polyethylene: The density ranges from 0.94 to 0.965 g/cm3. It is worse than low-density polyethylene in heat resistance and mechanical strength, and has low tensile elongation and a film thickness of 0.03 mm or more, but the transparency is not as good as low-density polyethylene. Its specific applications are vest bags, garbage bags and lined bags.


Cross-linked polyethylene: Compared with other polyethylenes, it has excellent performance in heat resistance, tensile strength, heat shrinkability and barrier properties, and can be used as a heat shrinkable packaging film.


The production process of the polyethylene film is to add dry polyethylene particles into the lower hopper and enter the screw from the hopper by the weight of the particles themselves. The pellets are melted by expansion friction or the like, and are discharged from the die die through filtration of the filter mesh, followed by inflation, air ring cooling, and plate pressing, etc., which are taken up by a pulling roller to form a finished film, and rolled into a cylinder.