Plastic surface protection film is the most widely used in the packaging field, and can be used for food packaging, electrical product packaging, daily necessities packaging, clothing packaging and the like.
They have one thing in common, that is, the plastic surface protection film should be color-printed, and as a food package, it is also required to perform multi-layer composite or vacuum aluminum plating.
Therefore, the surface protection film of the plastic surface is required to have a high free energy and a large wet tension to facilitate the firm adhesion of the printing ink, the adhesive or the aluminized layer to the plastic film;
In the production process of plastic film winding and high-speed packaging, the film surface is required to have a certain frictional property to prevent the film from sticking or slipping;
When used in packaging of electrical appliances, electronic products, etc., the film is required to have certain antistatic properties and the like.
The surface tension of the plastic surface protection film depends on the surface free energy, which in turn depends on the molecular structure of the film material itself. Most plastic surface protective films are non-polar polymers with low surface free energy and low surface wet tension, typically around 30 dynes/cm.
In theory, if the surface tension of the object is less than 33 dynes/cm, ordinary inks or adhesives cannot adhere firmly, so the surface must be treated. There are mainly corona treatment, chemical treatment, mechanical roughing, coating, etc., the most commonly used is corona treatment.
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