Reverse overprint is especially obvious in low and medium speed printing, and the reverse overprint phenomenon is greatly reduced in high-speed printing. The key to solve the problem is to analyze the causes. In reverse printing, the front color ink is generally reversed to the back color ink plate, and then enters the back color ink tank to change the color of the back color ink. Finally, printing cannot continue, such as yellow ink Gradually become a light green color, red ink gradually become purple red color. It can be solved from the following aspects: 1. Adjust the proportion of diluting solvent of back color ink to reduce the solubility of back color ink in contact with front color ink, that is, when diluting back color ink, add part of isopropanol and use less toluene as far as possible; 2. Increasing the printing speed can significantly reduce the contact time between the back color ink and the front color ink, which is also the reason why the reverse overprint is especially obvious in the low-speed printing, but there is no reverse overprint in the high-speed printing. This point may be limited by printing equipment and printing environment in actual printing; 3. Adjust the formulation of printing ink. First of all, we can improve the adhesion of the front color ink on BOPP film, so that when two layers of ink contact, the front color ink still adheres to the BOPP film. In the ink of CLPP system, the content of CLPP can be increased. Secondly, it can improve the drying speed of the front color ink, increase the drying channel temperature of the front color ink, and prevent the existence of a small amount of nonvolatile solvent in the ink film.
Dongguan Beite packaging materials Co., Ltd. - located in Dongguan City, the world's manufacturing city, is a subsidiary of Beite packaging (China) Co., Ltd., with a plant area of 6000 square meters. It is a flexible packaging enterprise integrating R & D, production and sales. It has a complete set of domestic advanced production equipment, a scientific and humanized management system and a group of experienced technical personnel For backing, to provide customers with quality products and first-class service.
The company produces composite bags, roll film, fruit bags, aluminum foil bags, suction mouth bags, self-supporting bags, zipper bags, anti-static bags, special-shaped bags, etc., which are suitable for the internal and external packaging of food, daily chemicals, electronics, toys, medicine, cosmetics, industrial products and other industries.
We uphold the integrity of cooperation, good quality, good service business philosophy, won the industry's approval, products sold to all over the world; welcome friends from all walks of life to inquire, visit our factory to investigate guidance and business negotiations.