Things to Consider When Buying Plastic Film

Plastic films are now used in various fields, but do you know what to pay attention to when purchasing plastic films? Let's take a look at the 9 things that you should pay attention to when purchasing plastic films. 1. Appearance There is no wrinkle or only a small amount of loose folds, and the appearance of the plastic film should be flat and smooth. There are no obvious unevenness, black spots, impurities, crystal points and rigid blocks, no stripes, spots, violent ribs and other disadvantages, no bubbles, pinholes and cracks, the aluminized layer of the aluminized film should be uniform, and no obvious signs are allowed. Bright bars, yin and yang surfaces, etc. In addition, the surface of the film is also required to be clean and free from dust, oil, etc. 2. Specifications and deviations The thickness should be uniform, and the width, thickness and deviation of the plastic film should meet the requirements. The thickness deviation of horizontal and vertical 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. 3. Transparency and gloss The light transmittance is required to be higher, for transparent plastic films. Generally, it should reach more than 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 have good gloss to ensure bright and beautiful printed and laminated products. 4. Physical and mechanical properties Therefore, since the plastic film is subjected to mechanical force during the printing and lamination process. It is required that the film material must have certain mechanical strength and flexibility. The physical and mechanical properties of plastic films 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. 5. Moisture permeability For example, when the relative humidity is 90% and the temperature is 30 ℃, it means the permeability of the plastic film material to water vapor under certain conditions. The mass of water vapor transmitted per square meter of a plastic film with a thickness of 25 μm in 24 hours. To a certain extent, it represents the moisture resistance of the film material. The moisture permeability of various film materials is different, which also determines the application range. 6. Oxygen permeability For example, when the relative humidity is 90% and the temperature is 23 ℃, it represents the oxygen permeability of plastic film materials under certain conditions. The volume of oxygen transmitted per square meter of a plastic film with a thickness of 25 μm in 24 hours. The moisture permeability of various film materials is also different. 7. Geometric dimensional stability Otherwise, the plastic film must have a certain geometric dimensional stability. The expansion ratio is too large, and it is easy to expand and contract under the action of mechanical force or heat during the printing and lamination process, which not only affects the overprint accuracy, but also causes wrinkles and curls, which seriously affects product quality and production efficiency. 8. Chemical stability These are all chemical substances, and plastic films are exposed to inks, adhesives and certain organic solvents during the printing and lamination process. Therefore, the plastic film must have some resistance to the chemicals it comes into contact with so as not to be affected by them. 9. Surface tension The surface tension of the film is required to reach a certain standard, in order to make the printing ink and composite adhesive have good wettability and adhesion on the surface of the plastic film. Otherwise, it will affect the adhesion and adhesion of inks and adhesives on its surface, thereby affecting the quality of printed and composite products. For example, the surface tension of biaxially oriented polypropylene film and low-density polyethylene film is required to reach 3.8 10-2N/m or more, and the surface tension of nylon film, polyester film and polyester aluminized film is generally required to reach 4.5 10-2N/m above. Generally speaking, plastic films must undergo surface treatment before printing or lamination to increase their surface tension and enable smooth printing and lamination.

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