In order to maintain the same density throughout the operation of the press, the pH and viscosity of solvent based ink must be kept constant. Careful control of ink viscosity (for water-based ink is pH and viscosity) will make the whole production run consistent color, ink quantity is uniform.
In the process of printing machine operation, due to solvent or amine compounds from the ink evaporation will appear high viscosity, resulting in the customer's products in the printing process ink color is inconsistent. In order to maintain the same density throughout the operation of the press, the pH and viscosity of solvent based ink must be kept constant.
When using a squeegee or cavity scraper system, the high viscosity ink will not be able to continue to fill the ink hole of the anilox roller, resulting in insufficient ink, so the ink color of the print can not be kept uniform and constant, and the color change will not be accepted by customers. If the viscosity of the ink is lower than that of the color matching, the color will become lighter. If the ink viscosity is very close to its minimum working viscosity, printing defects may occur.
When using solvent based ink, every 10 ~ 15 minutes to carry out a viscosity check. If you use water-based ink, you should check the pH and viscosity every 30 minutes. In the use of water-based ink, it is important to check the pH value and then check the viscosity, because the viscosity is affected by the pH value. Solvent based ink more often need to check the viscosity, because its solvent volatilization fast, and more unstable than water-based ink in the water.
In order to control the viscosity of the ink, a small amount of diluent should be added. Never allow the viscosity level to be high enough to require the addition of more than 0.5L of diluent to return the viscosity to the normal level. Careful control of ink viscosity (for water-based ink is pH and viscosity) will make the whole production run consistent color, ink quantity is uniform.
In order to control the viscosity of solvent based ink, solvent diluent should be added during the operation of printing machine. The proportion of quick drying components in the prepared solvent should be slightly higher than that of the solvent in the ink. For example, the ink contains 10% normal acetic acid, which acetate is a fast drying solvent, which volatilizes faster than alcohol, and alcohol is a slow drying component in the mixture. The concentration of acetate in the preparation solvent should be slightly higher to maintain the stability of the ink and maintain the viscosity level of the ink during a longer printing run.
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.
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