In the process of controlling the ink performance, the environmental temperature and relative humidity have great influence on the ink performance. The higher the temperature is, the faster the solvent volatilizes and the faster the ink becomes sticky. However, the two extremes of relative humidity (very high humidity and very low humidity) are not the case. It is difficult for the printer to control the ink performance when the relative humidity is at two extremes. Therefore, this has always been a problem that bothers the printing staff. Humidity more than 80 ~ 85% will make the speed of ink viscidity become very slow; and humidity below 15 ~ 20% will also make the speed of ink viscidity very slow. But when the environment is in two extremes, simply controlling the characteristics of ink solvent can not improve the viscosity of ink. The main component of paper is plant fiber, which can absorb moisture in the air. Therefore, the moisture content of paper changes with the change of temperature and humidity. When the moisture content of paper changes, the paper will stretch and shrink. Moreover, in the process of lithography, water is needed in the process of lithography. After the paper contacts with water, the moisture content will be different, and the size of the paper will be difficult to keep unchanged. As for color printing, overprinter will be inaccurate. The experiment shows that the change of relative humidity in the general air of 10% will cause the change of paper moisture content by about 1%, while the paper size will change by about 0.1%. Therefore, only the temperature and humidity of printing workshop can be controlled, and the change of paper moisture content can be reduced to control the expansion and contraction change. Paper is also affected by climate change in the process of delivery, transportation and storage from the paper mill, which will cause paper deformation. If the moisture content in the air is less than the water content of the paper, the water at the edge of the paper will disperse and evaporate, and the phenomenon of "tight edge" will appear; when the moisture content in the air is greater than that of the paper, the edge of the paper will absorb water, and the water content in the middle of the paper is less than that in the edge, the phenomenon of "lotus leaf edge" will appear; when the water content of the front and back sides of the paper is not equal, the paper will appear "curly". Paper deformation, also caused in the printing process overprint and paper wrinkle
。 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.