1) The transparency and hiding power of the ink depends on the difference between the refractive index of the pigment and the binder. After the multi-colored ink with high transparency is overprinted, the color light of the ink layer below can pass through the ink layer above to achieve a better color mixing effect and obtain bright colors. The comparison sequence of ink transparency is generally as follows: yellow> magenta> cyan> black, so the ink with poor transparency is printed first, and the ink with high transparency is printed afterwards.

2) The viscosity of the ink takes into account the printing sequence. In a four-color ink, each type of ink has a different viscosity, and the general viscosity is comparable to the lower one. Ink>cyan>magenta>yellow, so in the four-color printing press, printing sequences of black, cyan, magenta, and yellow are generally used. Increase the overprinting firmness, prevent the phenomenon of "coloring", the hue of the ink is changed, and the resulting picture is dark, dull and dull. Two-color machine uses cyan, magenta and black, yellow printing color sequence, ink absorption, easy drying, anti-dirty.

Second, according to the printing manuscript to determine the printing sequence

According to the contents of the printed manuscript, following the principle of highlighting the main color of the screen to prevent the main color from being covered, the general main color version is printed at the end, such as the portrait of a person, a mountain full of leaves, and an autumn landscape. Black, blue, after printing magenta, yellow; such as the spring scenery, landscape or snow-capped mountains of the picture, to strengthen the cold tone, the first black, magenta, blue and yellow.

Three. Layout ink size determines the printing color sequence

Whether it is a monochrome machine or a multi-color machine, multi-color printing is always printed in one color and then printed in a color version. If a large-area field version is printed in the first color, then other light-ink printing plates are printed. The printing effect is certainly not ideal, it is easy to scratch, poor ink absorption, dot flowers, difficult to dry. According to the first printing of light ink, after printing a large amount of ink plate color order.

The color version of the two-color machine should also follow the principle of large- and small-ink printing, and the large-ink printing plate should be placed in the second color group to prevent “coloring”.

Four. According to the requirements of the overprint to determine the printing color sequence

1) Four-color overprint. Paper overprinting may be affected by factors such as paper absorbing deformation or its own resistance to tension and the problems with plate making. For example, if the layout of the black text is misused as four-color characters, the monochrome machine can be printed in yellow, magenta, cyan, or black, and the gray balance can be added and the outline of the image can be enhanced; some manuscripts often appear as cyan and magenta texts. Overprinting, once the set is not standard is not beautiful, if the magenta and yellow overprint of the red text due to overprinting the subject performance is not very significant. In the two-color machine should be used cyan, magenta and black, yellow version of the printing color sequence, the effect is more ideal.

2) Printing gold and silver. Gold and silver inks have very low adsorption power and are printed on the last color possible; however, the hiding power of the two oils is extremely strong, and the ground version will cover all the colors. It is necessary to consider the subject matter of the plate making, whether the gold or silver version blocks the text of the four-color printing, or whether the image is hollowed out. When not empty, the gold or silver plate is printed first. If you do not pay attention to such a problem, the loss of the content text will occur. .

3) Print black text on the field version. Often encountered in the printing, after the first printing of black text printed magenta, yellow or spot color version of the text is reddish or yellowing, should be selected before printing the actual ground background color version of the printed black print sequence.

Five. The color of the paper should be considered different

The color printing paper is selected from different papers, the whiteness, smoothness, ink absorption, fiber looseness, and off-powdering degree of the paper are different; the properties of the coated paper are relatively inconsistent; other papers such as offset paper, writing paper, and white board Paper, textured paper and other rough surface, poor tension, in order to make up for the lack of paper surface, you can first print the yellow version of the primer.

VI. Printing sequence in visual effects

In the past, monochrome printing was often used to print yellow prints in the first color. Under light, yellow ink was visually weak and the amount of ink was not good enough. Strong ink can be selected for printing in the first color, such as printing order of cyan, magenta, yellow, and black, which is more convenient for visual or replacement of ink, and at the same time preventing the yellow plate from rapidly drying due to long distance, and glass is produced. Phenomenon.

In the production process, experience should be summed up for the printing color sequence for different printing equipment, paper, ink and different manuscripts. By referring to proofs, checking the printing plate, and selecting the correct printing color sequence, the superimposed superimposition effect will be finally satisfied.