Polyethylene plastic film is a colorless, odorless, translucent and non-toxic insulating material when it is used. It is widely used as a packaging bag, and polyethylene film can also be used to make various containers. It is an inert material, so it is more difficult to print and must be processed to produce better results.
The application of polyethylene plastic film in the packaging field is the most extensive, and such products can be effectively used for food packaging, electrical product packaging, daily product packaging, garment packaging, and the like. All of them have one thing in common: they need to perform color printing on plastic films, and also perform multi-layer lamination or vacuum aluminum plating as a food packaging process.
The polyethylene plastic film has a high free surface energy and a large wet tension during the manufacturing process, so that when used, it is advantageous for the printing ink, the adhesive or the aluminized layer and the plastic film, and the plastic film is firmly bonded. In the process of production coiling and high-speed packaging, the surface of the film is required to have certain friction properties to prevent the film from sticking or slipping; when used in packaging for electrical appliances, electronic products, etc., the film is required to have certain anti-static properties.
The surface tension of polyethylene plastic film depends to a certain extent on the surface free energy of the plastic film. The surface energy of the film depends on the molecular structure of the film material itself. Most plastic films such as polyolefin films (LDPE, HDPE, LLDPE, PP) are non-polar polymers and have low surface free energy and low surface wet tension, typically around 30 dyne/cm.
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