There are three factors to control the proofing quality of Kraft Paper Drawer Cigarette Boxes

There are three factors to control the proofing quality of Kraft Paper Drawer Cigarette Boxes

Proofing is a link between the previous and the next, it is very important for printing. It can check the previous image scanning, text input, layout and so on. "Is also a standard for post-sequence printing. Because the proofing is analog printing (whether traditional proofing or digital proofing), the proofing proof is bound to be different from the final print, but there is a principle that must be followed is that the printing can catch up with the proofing. Therefore, the quality of the proof and the size of the difference between the printed product and the printed product will have a great impact on the printing. So, how to control the quality of proofing in order to make printing easy to follow the proofing? The following is an example of traditional proofing to discuss this problem:

(1) Control of field density

Field density is the most important technical parameter to control dot replication and restoration. Different companies have their own technical indexes and error ranges. This technical index is determined by each company according to its own specific conditions. Generally, the field density of various versions is as follows: 1.30, M: 1.45, C: 1.50, K: 1.80. As for the margin of error, the European standard is ±0.07, and a company in China is said to control the margin of error within 0.05.

(2) Control of dot increase value

Dot increase value is also the key to control the quality of proofing, because the press is using the way of circular pressing, and the printing press is using the way of circular pressing. Obviously, the pressure of circular pressing is greater, so generally speaking, the dot increase value of printed matter is larger than that of proofing. Therefore, in the proofing to strictly control the dot increase value, otherwise printed matter will produce a large color deviation.

(3) adjustment of the prototype

(1) The pressure of the rubber roller is 0.03mm(measured every 120 ', take the average), that is, the thickness of the rubber blanket + the thickness of the liner: (2.286±0.030) mm;

(2) The plate pressure (including PS plate thickness) is +0.12-+0.15mm, that is, the PS plate surface is higher than the height of the guide rail;

(3) The pressure of the paper table (including the thickness of the paper) is +0.15-+0.18mm, that is, the height of the paper surface is higher than the guide rail;

(4) There are two rollers under both sides of the movable frame. When the frame is moved to one side of the ink leveling system and the machine is not pressurized, the pressure between the roller and the lower guide surface should be adjusted as long as the hand force is just enough to rotate.

⑤ Ink leveling system: inking roller in the plate or paper table ink bar width should be uniform. For digital proofing, because the printing ink used for proofing is different from the printing ink, in addition, the digital proofing dot is frequency modulation dot rather than the commonly used amplitude modulation dot in printing, so in analog printing, it is only through the color management system (CMS) to match the color space of proofing and printing to simulate the color of printing. However, at present is widely used several digital proofing machine can not achieve spot color proofing, which can not be said to be a larger defect.