Specifically, if a protective film is needed for parts that are easily worn, such as the cover of the product manual and the outer surface of the carton, it should be mounted after printing and before folding and cutting. This film must be very transparent, have good toughness, have a uniform texture, no blisters, and a smooth surface. It is usually made of polypropylene, and it is also pre-coated with a thermoplastic polymer adhesive to combine with the paper. The printing house uses a heated pressure roller to stick it firmly to the paper. The result is a better glossy surface, a thicker texture, and the colors printed on it are protected. We saw earlier that glazing has the same effect, but thick paper becomes brittle after glazing, but becomes flexible and resistant to folding after lamination. Today's coated paper covers generally need to be laminated, and high-end cartons and handbags, product manuals and corporate brochure covers, wall calendars, and trademarks on clothing... also need to be laminated. You will find that there are two kinds of films, one is as bright as a mirror, and the other is not very reflective. They are called "light film" and "matte film" respectively. The light film is the most transparent and has almost no effect on the ink color, but its reflection is sometimes unflattering. For example, a handbag is shiny after being covered with light film, but if it is slightly deformed after loading, it will appear soft and low-end. Glossy film is not suitable for wall calendars because it interferes with the line of sight. However, on flat surfaces such as hardcover book covers and cardboard boxes, the bright mirror-like effect is still good. The texture of matte film is thick and stable, and it is generally considered to be better than glossy film. High-end, its price is also more expensive, but it will affect the ink color like varnish. It is not suitable to use matte film for very picky colors, such as the character's skin color and corporate standard colors that are slightly biased.