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Plastic protective film viscosity influencing factors and selection knowledge
- May 14, 2018 -

The use of plastic protective film is often closely related to its viscosity, in general, there are three main factors affecting the viscosity of plastic protective film, namely: 1, wetting; 2, molecular movement and diffusion; 3, penetration. In fact, the pressure-sensitive adhesive can achieve close contact only with good wetting on the surface of the adhered object to create conditions for physical and chemical bonding.


At the same time when the plastic protective film is used, the pressure sensitive adhesive molecules will move toward the surface of the adhered material. When the distance between the two bonds is less than 5A, physical and chemical bonding will occur. Next, as the adhesive layer flows, it infiltrates into the recesses and voids under a certain pressure, so that the contact area between the two increases, and a mechanical bonding force is then generated between the adhesive and the adhered material.


When processing a plastic protective film, first, a suitable substrate should be selected. At present, when the substrate film is prepared, the main process methods used are blow molding, casting and calendering. In the surface treatment process of its substrate film, it mainly includes corona treatment, ie, formation of polar reactive groups to form extremely fine pits; and coating treatment, ie, uniformly coating liquid glue on the substrate. On the film, the initial drying.


According to different use requirements, suitable plastic protective film products should be selected. Then, in the selection process, what aspects should be analyzed? Everyone should know that for different surfaces of products, they need different stickiness. In addition, for similar surfaces, different materials may also require different tackiness. Subsequent processing steps are the key to determining stickiness. Follow-up processing generally has bending, stamping, cutting, drilling, thermoforming and so on.


Secondly, during the selection process, we must also pay attention to the reasonable matching of the thickness and viscosity of plastic protective film products. As for the tensile strength and elongation of the protective film, to ensure that the protective film flexibility and strength can meet the requirements. Before selecting a type, it is also necessary to understand the characteristics of the material to be pasted, as well as its surface properties, in addition to other requirements of the plastic protective film product, such as the use of the environment, storage and transportation conditions.