Gravure printing machine speed has a relationship with its structural composition, soft package factory in the purchase of gravure printing machine, you can consider two aspects of the factors, after examining before making a decision to buy.
Gravure printing speed, first of all, is determined by the length of the transfer distance between the colors of the printing machine. Because of the printing on the print color, if the previous color of the ink is not dry, after the color of the ink will dissolve the previous color of the ink down, resulting in color eating phenomenon. So gravure printing machine the longer the transmission distance between the various printing colors, the longer the natural drying time, the longer the printing speed will be able to go, and vice versa, it is difficult to improve the speed of printing.
Secondly, the drying box effect is good or bad to determine the printing speed, drying box effect is good, the ink is thoroughly dry on the good, not only the former color ink is not dissolved down, and solvent residues will be reduced. Gravure printing ink is hot air drying, not with hot baking dry. First of all gravure printing ink will prematurely film when it meets heat, the color film cover will affect the volatilization of solvents within the ink, it will form the phenomenon of ink false dry. Secondly, the ink contains a variety of solvents with different boiling points, so the volatilization speed of various solvents is different, that is, the low boiling point of the solvent volatilization speed, the high boiling point of the solvent volatilization speed is slow. When the higher the temperature, the lower boiling point of the solvent volatilization faster, the higher the boiling point of the solvent residual more. In view of the above two reasons, the greater the heating of the press drying box, the printing ink is more difficult to dry. Printing ink false dry and not dry, it can cause the print color or adhesion, print color or adhesion makes the printing speed to open not fast, printing speed is slow, on the amount of ink to be large, it is easy to cause the print color or adhesion, and so on, the printing speed is difficult to get up fast.
So the press drying box heating and blowing volume ratio should be correct, is the premise of ink drying. Secondly, if the printing press drying box on the printing plate run wind, printing ink will dry on the printing plate roller, printing pattern of the shallow network can not be printed, the transition color will also be printed incomplete. Once again, the heat of the drying oven to bake directly on the film, the film will therefore stretch. The wind will blow directly on the film, and the film will shake. Film stretching, shaking, that will affect the accuracy of the printing overlay.
In the selection, the purchase of customized paper bags with logo presses should pay attention to, gravure printing machine good drying box should have: heat can not be directly baked on the film surface, the wind can not blow directly on the printed matter, not like the printing plate on the wind, blowing amount of wind to be greater than the amount of heat, exhaust should be smooth, with a second return air performance is better.
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