The production process of plastic film rolls generally includes the following steps:
Firstly, plastic raw materials, such as polyethylene (PE), polypropylene (PP), or polyester (PET), are fed into an extruder. The extruder heats and melts the raw materials to a specific temperature. The molten plastic is then forced through a die to form a continuous tube or sheet of plastic. For example, in the production of PE film rolls, high - density polyethylene pellets are commonly used as raw materials.
If it is the blowing process, air is blown into the molten plastic tube to inflate it into a thin - walled bubble. The bubble is then cooled by air or water to solidify the plastic film. In the casting process, the molten plastic sheet is cast onto a chilled roller. The roller rapidly cools the plastic, forming a film with good surface quality and thickness uniformity.
For some plastic films that require high strength and good mechanical properties, such as BOPET film, a stretching process is employed. The film is stretched in both the longitudinal and transverse directions. This orientation of the polymer chains improves the film's tensile strength, transparency, and barrier properties.
Finally, the produced plastic film is wound onto a core to form a plastic film roll. The winding process needs to be carried out evenly and tightly to ensure the quality and appearance of the film roll. The film roll is then ready for packaging and further distribution to various application industries, such as packaging, agriculture, and electronics.
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