Dirty is the image area and the non-image area on the dirty fingerprints version points, lines, or strips Road, which leads to the dirt on the prints, as shown below. Factors causing the dirty plates are mainly the following aspects. (1) CTP plate itself quality problems, such as the production process is not good, not enough storage capacity graining, plates batch performance fluctuations. (2) CTP version of the output, the developing part of the problem, leading to the plate left at the end. Therefore, always pay attention to check the exposure amount or degree of aging potion; dilution ratio of protective colloid is appropriate color card printing, whether the deterioration; revised version if damage aluminum plate group. Fountain solutions and printing (3) printing press does not match or inappropriate allocation of water in the tank, the high acidity; low ink viscosity, emulsification is serious; ink roller carriage ink or excessive ink roller aging. Before the CTP version of the machine, some printing companies will use clean version was clean layout, printing prevent dirty. But pay attention to the need to ensure clean version of the CTP coating solution did not hurt, otherwise it will lead out version of the phenomenon. When the dirty plates Dongguan color card printing custom, if they can use to wipe clean version was then the floating dirty, not clean the plate is not due; if need retouching pen disappear, then the plate is not flush clean. Printing process tension zone tension control division 1. Depending on the parts gravure tension control mode can be divided into three tension zone: unwinding tension zone, printing and cutting the tension zone tension zone. Unwinding tension control tension zone includes a tension roller feed paper web between the mandrel to guide the group; printing tension zone includes a guide group feed tension roller to the printing paper set out the tension control force between the rollers; from printing set out to cut the paper roll slitter tension zone between the tension rollers. For no slitting group, just rewinding gravure group, which cut the tension zone ranging from a paper roll into the area between the complex forces reel. Control Principle unwinding tension zone tension zone 2. Printing education, it can be seen from its range of packaging machinery, mainly by the open-book machine completed. Tension control is a major function of unwinding machine works so consistent principle of the tension zone control and unwinding machines, closed-loop control system consists of the clutch, tension roller and tension controller component. Printing tension zone, is an important part gravure printing machine tension control system is to ensure the accuracy of print registration key. The tension zone tension control principle is to use the principle of differential layoffs, the system by controlling the feed tension control principle is the principle of differential system by controlling the tension roller and the paper feed roller force operating speed color card printing factory in Dongguan to adjust the paper fed into the printing group and the speed of the printing group, by controlling the amount of paper out of the printing group, to adjust the tension in the sheet. Currently commercial web in China, most of the gravure printing machines are running feed tension roll and the printing speed synchronization, the paper tension roller shaft is connected to a stepping motor, in order to achieve differential control. Cutting tension zone, the importance of its tension control tension zone with print as important, if the tension is unstable and can not reach the cutting precision media also do not produce qualified products. To this end, the tension zone control principle general tension zone printed using the same way that differential control, the basic rate of printing group out of the running speed of the paper roll force, cutting force the group out of paper roll shaft and stepping motor connected to the crop, to achieve differential control. Certified color card printing company in Dongguan | color card printing | beyond printing by the Dongguan City, often beyond packaging products factory provided. Dongguan Chang-ping beyond packaging products plant (www.dgcyp.com) strong, credible, in Dongguan, Guangdong paper printing industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead beyond printers and you hand into the brilliant, for a better future!