Proofing plays a role of inheritance, it is very important for printing. It can check the previous image scanning, text entry, layout, etc. , Is also a standard for subsequent printing. Because proofing is analog printing (whether traditional proofing or digital proofing), proofing proofs must be different from the final print, but there is a principle that must be followed is that printing can catch up with proofing. Therefore, the quality of the proofs and the size of the difference with the printed product will have a great impact on printing. So, how to control the quality of proofing to make printing easy to keep up with proofing? The following uses traditional proofing as an example to discuss this issue: (1) Field density control The field density value is the most important technical parameter for controlling network replication and restoration. Different companies have their own different technical indicators and error ranges. This technical index is determined by each company according to its own specific situation. In general, the solid density of each color version is Y: 1.30, M: 1.45, C: 1.50, K: 1.80. As for the error range, the European standard is ± 0.07, and it is said that the error range of a domestic company is controlled within ± 0.05. (2) Control of the increase of the dots The dot increase value is also the key to controlling the proofing quality, because the proofing machine uses the round flattening method, while the printing machine uses the round flattening method. Obviously, the pressure of the round pressing method is greater, so in general, the dot increase value of the printed matter is larger than the proof. Therefore, the dot increase value should be strictly controlled during proofing, otherwise the printed product will have a large color deviation. (3) Adjustment of the proofer ①The pressure of the rubber roller is 0.03mm (measured every 120 ', and the average value is taken), that is: the thickness of the rubber cloth + the thickness of the pad: (2.286 ± 0.030) mm; ② The platen pressure (including PS plate thickness) is + 0.12- + 0.15mm, that is, the surface of the PS plate is higher than the height of the guide rail; ③The pressure of the paper table (including the thickness of the paper) is + 0.15- + 0.18mm, that is, the surface of the paper is higher than the height of the guide rail; ④ There are two rollers on both sides of the movable frame. When the frame moves to the side of the ink leveling system and the machine is not pressurized, the pressure between the roller and the lower rail surface can be rotated by just applying force. , Too tight and too loose need to be adjusted; ⑤ Ink leveling system: The width of the ink stick of the inking roller on the plate or paper table should be uniform. For digital proofing, because the ink used for proofing is different from the ink used for printing, in addition, the dots of digital proofing are FM dots instead of the commonly used amplitude modulation dots for printing, so in analog printing, only through the color management system (CMS) Match the proofed color space with the printed color space to simulate the printed color. However, at present, several digital proofing machines that are commonly used are unable to achieve spot color proofing, which is inevitably a major flaw. home beauty device,home rf beauty device,home use beauty device,home care beauty device Xi'an Double H Health Technology Co., Ltd , https://www.xadoubleh.com