Ink is indispensable in the process of screen printing process, accurate mixing all kinds of printing ink, skillfully to improve production efficiency and the quality of the printing quality plays an important role.
To smoothly network printing, we must make the deployment of ink, the substrates and the preparations for the plate net, if choose the type of ink is appropriate, ink color, viscosity and diluents are added appropriately.Before printing, we should make the ink has a good applicability and printing eligibility, also need to make appropriate adjustments if necessary.
Printing ink mixing generally shall be the responsibility of the personnel, the main rely on past experience, must make the deployment of ink with good printing performance, after the ink color should conform to the sample, the ink viscosity and liquidity allocate appropriate, correct for the amount of desiccant, ink quantity slightly more than on the dosage of the print, etc., thus increasing the complexity of the deployment of ink.Ink mixing workers want to correctly and quickly grasp the technology, only by constantly practice, familiar with all kinds of printing ink, hue and auxiliary materials, the properties of master ink color change rule.
Before the deployment of ink, to calculate the each color print ink consumption, make the deployment of ink is appropriate.As far as possible the same type of ink and auxiliary agent of ink, needed to modulate the color in time, determine the mixing proportion of primary color and secondary color, generally gives priority to color with a primary color ink, the other is secondary color.Configuration of green ink, for example, will mix yellow ink, blue ink, if the green is inclined to yellow, when the ink is given priority to with yellow color blue as auxiliary color.However, before the configuration to consider the application which matches a yellow ink is more advantageous to hue, if use dark blue and yellow, the green ink phase will with red, and dark color is not bright;If you use in the yellow and blue or blue to allocate, can get yellow tend to taste more fresh and tender green ink.
To obtain accurate color, ink should be stable under natural scenery, at the same time can not be a variety of color collocation together to observe, to avoid affected by illusion.In the configuration of fresh ink, dark ink to gradually close to the dosage, avoid by all means a join again after a large number of light color ink remedy too much.Should reduce mixed color as far as possible at the same time, the more color, gray.
In addition, but also pay attention to the ink color change before and after drying, such as a large quantity of ink absorption of light color printing substrates, dry ink, often pale.Screen printing ink color mixing is screen printing production that cannot be ignored in the process of a link, cannot leave the color additive and subtractive process of pigment such as basic principle., according to subtractive primary colors, M, Y C according to the proportional additive such as black.However, if the printing ink color additive black degree is not enough, "so in addition to the direct application of black ink with the ink, also can be mixed with trace amounts of light blue.
1, light color ink mixing
Light color ink predominantly white ink mixed with other color mixing.Note that must not add thinner to ink in the ink, because the original color color in diluent certainly ability is strong, and the original color tinting strength is differ, the general rule is black > > > blue red yellow, so it's easy to cause the waste hue and the ink is not allowed.Commonly used gradually in thinner trace in the original method to allocate the color.
, for example, the deployment of grey ink thinner and the proportion of black ink is about 4:1, if the lighter grey, you need to add a certain amount of thinner;Instead if some black gray, to join a small amount of black ink, analysis of hue, in advance, the hue to the ideal effect, you need to use 1, step by step.
2, the deployment of dark ink
Only use the original color allocate, not to join any other thinner, collectively known as dark ink mixing.Allocation should be according to the amount of ink prints need to be consumed and the proportion of the original design formula, respectively according to take the ink.First put the main color is in the disk, and then join the complementary color, after the ink to make, take very little ink made with small sample, use a magnifying glass to observe its hue is in compliance with the same.
Such as in the process of preparation, in accordance with the formula dosage has failed to meet the requirements of the same hue of the vision, still need to add other auxiliary material, at this time to join the material performance, hue, accomplish know fairly well, avoid the waste of ink and printing eligibility to change.
According to the theory of subtractive process, the deployment of ink should use less as far as possible when the original color species, otherwise it will reduce the brightness of the ink, affect the bright color.
3, ink matters needing attention
A, choose the ink quality, pay attention to the nature of the original ink and color must conform to the sample, color can not be the same, but to try to close the gap, strive to mark tonal and consistent.
B, printing ink to has proper viscosity and liquidity.
C, plus the amount of other auxiliary materials to the appropriate, must not too much or too little, auxiliary material is generally not exceed 5% of the amount of ink.
D, the deployment of ink quantity must be based on the seal number, guarantee the sufficient quantities, and a little rest.
E, detailed analysis of the same color, the strict calculation and grasp the original ink and add the proportion of diluent.When the ink to considering the nature of the substrate and the temperature and humidity difference and impact.
F, the ink should be less as far as possible to add different color printing ink, had better use two kinds of color ink to allocate, within no more than three, because the less the color type, mixing the better the results.
G, adopts the principle of "1" when the ink, whatever makes the bright light and dark ink, when hue close to sample, to be cautious.Different manufacturer production of printing ink, it is best not to mix calls, try to use the same manufacturer to different colors of ink for toning, otherwise will produce tonal uneven phenomenon, serious when they appeared together and make the printing ink scrapping.
H, natural drying (using solvent volatilization ink) such as paper, plastic, ink color change before, during, and after drying too obvious, wet ink before deep, and dry after a lighter color.If the ink to dry by drying, light color is more shallow than it was before drying after drying, drying dark after dark.Therefore, to comprehensively consider black color difference before and after drying.
I, master the basic knowledge on color, are used in ink, the color and screen printing technology is analyzed.At the same time, pay attention to during the process of ink printing ink color brightness, brightness of ink as far as possible to the original color is to allocate, otherwise easy to use up the ink "grey", reducing the original color brightness.
4, the adjustment of the ink printing eligibility
Usually, just the factory screen printing ink viscosity is bigger, when used according to the characteristics of printing image, the number of wire mesh, the printing speed, temperature, humidity, substrates, smoothness, and ink absorption performance of surface tension, etc., using the appropriate solvent, diluent, surfactant, withdraw goo, light oil, etc., the ink viscosity, liquidity, surface tension, drying speed, glossiness and other comprehensive adjustment.
A, to print the small lines, text, outlets, should use less liquidity, slightly less dry ink;Instead, to print the thick line, text, design, selection of ink viscosity bigger as well, dry faster.
B, high-speed printing, printing ink liquidity should be slightly larger, dry faster.
C, strong absorbency of paper and ink liquidity can be bigger, drying can be slower.
D, at high temperature, ink viscosity should be slightly larger, slightly slow drying.
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