1, printing and color sequence

(1) the table - the version of the roller pattern is negative, the color from shallow to deep arrangement, the white version of the row at the forefront of the role of bedding to increase the reflection density;

(2) in India - version of the roller pattern is positive, the color from deep to shallow arrangement, the white version of the last row from the substrate to increase the role of reflection density.

2, color fixed order principle

(1) the color of the overlay relationship as far as possible together.

(2) easy to deform the film such as NY, PE printing, there are overlay relations as far as possible together and the color sequence in the former.

(3) spot color:

A) the color of the text or small color, color sequence front.

B) large area background color: dark color sequence front, light-colored sequence by the rear.

3, how to determine whether to use spot color

(1) some special bright colors with spot colors, such as orange, pure blue, gold, silver and so on;

(2) small text, such as two-color or two-color overprint, use the spot color, or offset will appear after the effect of overprint.

(3) the case of a large area of color, it is recommended to use spot color, otherwise in the transfer pattern effect will affect the color of the color, resulting in color cast.

4, the version of the roll in the horizontal and vertical patterns are unit of the imposition, layout width and perimeter on the selection of the following principles:

(1) the case of conventional materials as far as possible by the widest row of materials, for the highest material utilization;

(2) the case of special materials as far as possible by the standard width of standing row, to avoid re-procurement and non-commonly used materials backlog;

(3) in the printing press to allow the perimeter, as far as possible to the large perimeter row, which is conducive to speed up and improve efficiency, with the advance is also conducive to improving the shallow network transfer. But stressed not to rely on the maximum, because if the circumference is too large, version of the roll is basically filled with ink, but likely to cause ink blistering, affect the printing results.

5, version of the roller and ink to achieve the best match in order to print the best product, then how to consider the printing plate may occur when the defects in advance by changing the plate making process to improve it? Here are some simple and common examples.

(1) For the field easily against the white silk color, such as special coffee, special green, special blue, etc., in the plate to consider deepening the carving, of course, not too deep, preferably 45um or so, and enhance chrome finish.

(2) For the first point, if the spot color, if there are spot color words, then if only consider deepening the carving is not enough, because the text after the deepened easy to cause edge glitches, so this spot color version should separate the two Times carving, the text on the use of shallow network technology carving.

(3) for such spot colors are also anti-white text, there may be contradictions, because the deep drawing to avoid drawing after the text will cause burr, so you can only see customer requirements, evasive to achieve the best results.

(4) For blue, blue, etc. in 80% of the net around the area prone to rough points in the plate before the confirmation, it should be advised to increase to 90% or 70%.

(5) different types of different manufacturers of ink, basically have differences in the hue, some differences are also larger, such as alcohol-soluble and benzene there are significant differences in solubility, it should be considered with different carving curve, so as to achieve the most Good reduction effect.

6, plate chrome is the purpose of what?

After the establishment of graphic plates, but also coated with a layer of chromium, chrome is to improve the surface hardness, protect the printing plate roller, thereby increasing the printing plate resistance to India force. Because the chrome layer has a strong hardness and wear resistance and chemical stability, can make the plate roller surface has a good mechanical strength, and can make the plate for a long time to keep luster.

Chromium is mainly used for the electrolyte and chromic anhydride sulfuric acid. Electroplating process is to control the key to good current and electrolyte temperature. Temperature is generally controlled at 50 ~ 55 ℃, electroplating process requires the best in the ± 1 ℃ change, and to ensure uniform temperature of the electrolyte. In the conditions permitting to increase the current, the greater the amount of current, the higher the hardness.

7, roller copper quality should be detected which aspects?

Roller copper quality should be detected the following aspects:

① After the visual inspection of copper plated surface is smooth. Requirements coating surface is very smooth, no glitches and blistering, peeling and so on.

② Check with a hardness tester to see whether the hardness of copper in the specified range. If the hardness is too high will dilute the concentration of additives in the plating solution, otherwise it is necessary to reduce.

③ measuring the thickness of the coating. Here refers to the thickness of copper plate, it needs a certain thickness, or to the post-processing difficulties. Of course, the thickness to be based on post-processing and post-processing margin to determine.

8, roller plate-making quality should be detected which aspects?

Roller plate-making quality should be detected the following aspects:

(1) Check whether the registration mark and the line on the roller are correct.

② plate after the roll is best to use dot detector inspection - the depth of the next network point, the middle tone, dark tone and high profile.

③ Check the roller size is correct.

④ Check pattern alignment is correct.