The speed of gravure press has something to do with its structure. When purchasing gravure press, the soft bag factory can consider two factors and decide whether to buy it after investigation.
The printing speed of gravure printing machine is first determined by the transmission distance between colors. Because of the overprint on the printed matter when printing, if the ink of the previous color is not dry, the ink of the back color will dissolve the ink of the front color, resulting in color eating phenomenon. Therefore, the longer the transmission distance between the colors of gravure printing machine and the longer the time of natural drying, the more printing speed can go up. On the contrary, it is difficult to improve the printing speed.
Secondly, the effect of drying oven determines the printing speed. If the drying oven is good, the ink will be dried thoroughly. Not only will the front color ink not dissolve, but also the residual solvent will be reduced. Gravure printing ink is dried by hot air, not by heat. First of all gravure ink heat will prematurely conjunctiva, the coverage of color film will affect the evaporation of solvent in the ink, will form the phenomenon of ink false dry. Secondly, the ink contains a variety of solvents with different boiling points, so the rate of volatilization of various solvents is different, that is, the volatilization speed of low boiling point solvent is fast, and that of high boiling point solvent is slow. The higher the temperature is, the faster the solvent with low boiling point volatilizes, and the more residual solvent with high boiling point is. In view of the above two reasons, the greater the heating capacity of the dryer, the more difficult the printing ink to dry. If the printing ink is false dry or not, it can cause color dissolving or adhesion of the printed matter. If the printing ink dissolves or adheres, the printing speed will not be fast, the printing speed will be slow, and the amount of oiled ink will be large, which will easily cause color dissolution or adhesion of printed matter, and so on, the printing speed will be difficult to increase.
Therefore, printing machine drying box heating capacity and blowing rate ratio to be correct, is the premise of ink drying. Secondly, if there is wind on the printing plate in the dryer of the printing machine, the printing ink will dry on the printing plate roller, the light screen of the printing pattern will not be printed, and the transitional color will not be printed completely. Again, the heat of drying oven is directly baked on the film, which will stretch the film. If the wind blows directly on the film, the film will shake. Film stretching, shaking, which will affect the accuracy of the printing set.
When selecting and purchasing printing machines, attention should be paid to the following: heat can not be directly baked on the film surface, the wind can not be directly blown on the printed matter, the wind can not run like the printing plate, the blowing capacity should be greater than the heating amount, the exhaust air should be unobstructed, and the secondary return air performance is better.
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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