The self-adhesive sticker is usually coated with transparent BOPP film on paper self-adhesive materials, which can achieve the purpose of protecting pattern, waterproof, anti-corrosion and increasing the stereoscopic impression of the sticker. Other types of films, such as PET and PVC, can also be used as composite films, but their application is not common. Due to the high cost, the coating of paper roll materials has been gradually replaced by UV glazing technology. Methods for testing the adhesiveness of the self-adhesive sticker: Before self-adhesive sticker is used, it is very important to test the type of adhesive to see whether this adhesive belongs to self-adhesive thermos or glue-coated water paper. Some adhesives react chemically with specific substances. For example, self-adhesive sticker used as a sticker can contaminate certain special fabrics under certain conditions. Some sticker that requires temporary tackiness will produce permanent tackiness underexposure conditions. On the other hand, some sticker that requires permanent adhesion will lose adhesion on some surfaces. The reason why the self-adhesive sticker is not firm is complicated. Based on many years of experience in the self-adhesive sticker industry, the following three methods for testing the adhesiveness of self-adhesive sticker are given: 1. Initial adhesion: The common method is rolling ball method, that is, fixing the adhesive back face up on a slope, and then sliding the standard steel ball (of different sizes) down from the top. The larger the steel ball that can adhere to, the greater the initial adhesion. 2. Sticky force: stick two standard steel plates with hooks with self-adhesive glue, then hang one steel plate on the fixing frame, and put a 2kg weight on the other end to see how long the following steel plate will not fall down, so as to calculate the duration. 3. Peeling force: stick the adhesive on the standard steel plate, peel off the sticker with the constant speed of the instrument. The force used by the instrument several times is the peeling force of the adhesive. For more product details, please click on our official website: https://www.print-labels.net/
