It is a product in which the plastic film coated with the adhesive is bonded to the paper printed matter after being heated and pressed to form a paper-plastic composite. It is currently common. One of the post-printing processes for paper prints. The film-coated printed matter has a thin and transparent plastic film on the surface, and the surface is smoother and brighter, which not only improves the gloss and fastness of the printed matter, but also prolongs the service life of the printed matter, and the plastic film also protects against moisture. Waterproof, anti-fouling, abrasion resistant, folding resistant, chemical resistant and other protective effects. If the transparent bright film is used, the printed image of the coated product is more vivid and full of three-dimensional, which is especially suitable for the packaging of green foods and the like, which can cause people's appetite and desire for consumption. If a matt film is used, the film product will give consumers a noble and elegant feeling. Therefore, the packaged printed matter after the film can significantly improve the grade and added value of the product package.
The laminating process requires the production personnel engaged in laminating processing to apply the appropriate processing temperature and pressure according to the different properties of the paper and ink, so that the adhesive firmly bonds the plastic film and the printed paper into a paper-plastic composite. Quality standard of coated products: the surface is clean, flat, not fuzzy, good finish, no wrinkles, no foaming, no paper-plastic separation, no powder marks. The degree of dryness is appropriate and there is no stickiness of the surface film or paper. After slitting, the size of the slit is accurate, the edge is smooth, and no film is formed. No obvious curling, seven bends and eight curls.
During the laminating process, the relationship between temperature, pressure and time of the paper and the plastic film passing through the thermocompression bonding mechanism is handled. The fusing phase controls the thickness of the adhesive, the amount of glue, the temperature of the drying tunnel, the temperature of the hot roll, and the mechanical pressure. Factors such as mechanical speed can avoid problems such as blistering and poor paper-plastic bonding during filming.