Printing of dairy packaging materials

Because dairy products are a kind of edible products, so it needs special attention to the safety of food. The phenomenon of ink migration when the plastic cup is heat-sealed in the lid material is non-producing, and it is also something we need to resolutely avoid. The reason for the phenomenon is:

Due to the poor temperature resistance of the ink. When the cover material is sealed with the cup, the temperature of the heat-sealing knife heats the ink, so that the binder in the ink melts and liquefies. Under the pressure of the heat-sealing knife, the binder is melted and the pigment is transferred to both sides of the blade. . This does not happen if the supplier uses a heat-resistant ink or an ink that can penetrate the substrate film.

In the printing process of plastic cups, there are several factors that affect the printing quality of a single cup:

The key to the quality of single-cup printing is the position of the pattern, the level of the pattern is clear, and the ink adhesion is strong. In addition to these strict requirements for the cup device itself, the quality of the cup body, the quality of the design plate, the quality of the ink There are certain requirements, the printing quality of a single cup will directly affect the production efficiency and product quality.

To ensure that the printing quality of a single cup must first ensure the uniformity of the thickness of the plastic cup; the cup body is too thick will cause the plastic cup and the printing core match not in place, directly reflected in the plastic cup on the position of the printing pattern varies; Cup If the body is too thin, there will be a gap between the plastic cup and the printing core; the plastic cup will be distorted. The printing quality of the plastic cup has a close relationship with the printing machine, the imported machine printing pattern is clear and vivid, and the domestic printing machine's printing pattern is rough and fuzzy.

For the cover film, the printing method also has certain characteristics, and there are certain requirements for the ink, specifically:

The printing method of the cover film is gravure printing. In this method, the ink is printed on the composite layer, which is usually said to be printed. The ink must have good adhesion, and the ink has good compatibility with polyurethane, otherwise it will Affect the printing effect and the composite fastness.