Polyethylene film is a resinous material with thermoplastic properties that is synthesized by inducing oxidation polymerization of ethylene gas. The degree of pressure used in its manufacturing varies according to the density and melting point of the virgin polymer resin being used. Most commonly, sheets of polyethylene film are produced using a process known as blown film extrusion, in which the polymer resin is melted to its flow point and then extruded through a die to produce a tube of plastic. While the polyethylene is still supple, the tube is closed off at one end and then blown to inflate and stretch the film into the desired length and thickness. The thickness of polyethylene film can be as thin as .0004 inch (10.16 microns).
The introduction of this film was considered groundbreaking in terms of its application in the packaging industry. Specifically, it has proven to be highly valuable in the flexible packaging market. In fact, it has captured the majority of the plastic packaging segment, which primarily consists of bags and wrapping material used for storage or to provide protection from the environment. This includes plastic wrap to protect agricultural crops, as well as ordinary kitchen wrap used to preserve food. Of course, polyethylene film is also essential in the manufacturing of bags, from dry cleaning protective covers to garbage and grocery bags.
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