What are the basic performance requirements for plastic film materials?
|The surface of the plastic film should be smooth and smooth, wrinkle-free or only a small amount of active pleats, no obvious unevenness, black spots, impurities, crystal points and stiff spots, no streaks, spots, gluten, etc., no bubbles, needles Holes and cracks, the aluminized layer of the aluminized film should be uniform, and there is no obvious bright strip, yin and yang surface. In addition, the surface of the film is required to be clean and free from dust and oil. The width, thickness and deviation of the plastic film should meet the requirements, and the thickness should be uniform, the thickness deviation in the horizontal and vertical directions is small, and the deviation distribution is relatively uniform. In addition, the thickness of the aluminized layer of the aluminized film should also meet the requirements.|
For transparent plastic film, its light transmittance is higher, generally should be above 92%. For opaque plastic films, such as white film, it is required to have high whiteness and good opacity. In addition, the plastic film should also have good gloss. The physical and mechanical properties of the plastic film mainly include tensile strength, elongation at break, tear strength, impact strength, etc. In addition, the firmness of the aluminized layer on the aluminized film should also meet the requirements.
The plastic film must have a certain geometric dimensional stability. Otherwise, the expansion ratio is too large, and it is easily deformed by mechanical force or heat during the printing and compounding process, which not only affects the overprinting accuracy, but also wrinkles. Problems such as curling seriously affect product quality and production efficiency. Plastic films are exposed to inks, adhesives, and certain organic solvents during printing and lamination. These are chemicals. Therefore, plastic films must have some resistance to the chemicals they are exposed to in order to be free from them. influences.