The hottest printing production experience three p

2022-09-19
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Three printing production experiences (making up, matching ink, pearlescent ink)

making up tips

when making packaging cartons, the post sequence die cutting processing of printed products is a very important link in the production process. When a printing factory uses a flat automatic die-cutting machine for die-cutting, the edge of the carton after die-cutting is often not smooth, which will naturally affect the beauty of the product more or less. The main reason that affects the beauty of products is that during die-cutting processing on the flattening automatic die-cutting machine, it is necessary to break a few more small openings with the knife near its mouth to smoothly pull the die-cut finished products out of the machine. The broken small openings are reflected in the box after die-cutting, and the edges are not smooth

the main solution is to try to put the adhesive part of the carton on its mouth in the jigsaw. After ingenious composition, the appearance of the paper box formed by grinding and cutting will be very beautiful

for products with more than two collages, printing plants generally use two methods in making up. If the advanced nano silver and nano copper fiber cases developed in the drawing between the two collages can be seamlessly connected, the one size fits all post press processing method should be used as far as possible, and no gap should be left in the middle, because the one size fits all method can save paper, can also save the application of making knife molds, and is conducive to the elimination of waste after die cutting, killing three birds with one stone. However, if the pattern between the two pieces cannot be seamlessly connected. Or due to the limitation of the shape of the two products, it is impossible to cut one size fits all. Generally speaking, a 4mm wide knife row position should be reserved between the two products, and each product should have at least 2mm pattern bleeding

to sum up, the printing plant 3 The cement paste mixer can flexibly and skillfully make up the plate, which can not only save costs, but also avoid the bad impact on the die-cutting processing caused by the plate making

several problems that should be paid attention to when mixing ink

the allocation of ink is one of the important links in the printing process. The quality of printing ink directly affects the quality of printing products. The following is a little experience of printing factory on ink distribution, and I hope to discuss it with you

I. when mixing ink, you must pay attention to: hue, lightness and chromaticity

first of all, we should carefully analyze the primary color manuscript according to the principle of three primary color inks to determine the color of the main ink and the color of the auxiliary ink. Theoretically speaking, according to the principle of three primary colors, any complex color can be mixed. However, in practice, it is not enough to mix the colors required by customers only by using three primary color inks. Therefore, in practical application, more than ten kinds of inks, such as dark yellow, medium yellow, light yellow, dark blue, medium blue, light blue, dark red, red, orange, light red, green ink, must be used to meet the use requirements

secondly, when we mix lightness after hue adjustment, we usually encounter two situations: too strong lightness and insufficient lightness. If the lightness is too strong, you can add strong pigments with appropriate hues or simply add black or white to reduce the lightness. If the lightness is insufficient, you can add some white ink or light color ink with appropriate hue to enhance its lightness. For example, we think the brightness of the yellow is too strong. In order to reduce the brightness, we can add a little purple. Finally, adjust the chromaticity of the paint. When the color is too strong or pure, you can add gray or black ink, or add complementary color ink. If the color is too gray, you should add pure strong color ink

second, we should also consider the type of printing machine used in the printing process when allocating ink

the performance of each printing machine is different, so there are different problems to pay attention to when mixing ink. For example, when matching ink for offset press, it should be noted that the ink color should be darker than the original color when expanding the sample. Because there is no pressure of printing when developing samples, its ink layer is always relatively vain. When printing, the rubber has a great pressure on the paper, the ink layer is solid and uniform, and the actual ink amount is less than that of the extension sample. If the ink layer is thin, the coloring power is poor

third, we should also know the variety of paper when mixing ink

use paper with loose texture and rough surface, which has large capillary adsorption and can increase the ink absorption capacity. Pay attention to increasing the amount of ink when mixing ink. If you use glossy and strong paper such as coated paper, you will use less ink. Attention should be paid to reducing the amount of ink to avoid waste

fourth, we should also consider the pressure of the printing press

when the pressure of the printing machine is high, the layout is flat, which can make the imprinted ink layer flat, solid and uniform, and the printing plate has no blooming phenomenon. The pressure of the machine is small, and the force on the layout is insufficient, which makes the imprinted ink layer floating and weak, resulting in the occurrence of the printing plate. We can only increase the amount of ink to change the state of the printing plate's blooming and exposure. This shows that the same printing plate and paper require more ink to print on a low pressure machine than on a high pressure machine. Therefore, printing plates with large layout pressure are usually printed on the round flattening machine, which is not only beneficial to improve the quality of products, but also save ink

to sum up, it is a little experience of the printing factory in printing ink distribution, and I hope to discuss it with you

rational application of pearlescent powder in the printing process

this time we mainly talk about the rational use of pearlescent powder in the printing process

1. How to use pearlescent powder safely

pearlescent powder is a translucent micro flake pigment. If the operator accidentally inhales into the lungs, it will cause corresponding damage to the body. It is suggested that the operator should wear a mask and rubber gloves before mixing the pearlescent powder because it is selected for the water inlet (outlet) parts of polimotor 2, open the package and gently put the required amount into the tank (barrel), and then soak it in 30% ethyl acetate or isopropanol for 30 minutes, which is easy to operate, but it is not suitable to stir at high speed, otherwise the particle size of pearlescent powder will be damaged and its gloss will be affected

2. How to mix pearlescent powder with pigments

gravure printing mainly uses low viscosity liquid ink. When mixing pearlescent pigments, we should choose the binder (resin) with higher transparency and the transparent diluent with better printability. When preparing color ink, we should choose different kinds of color ink according to different paper. White card and white board paper should use pigment pigments, and PET composite paper should use dye pigments. Pigments and pearlescent powder can be mixed, generally not more than 20% of pearlescent powder. If the tone is too heavy, it will affect the pearlescent effect, because pearlescent pigments can have special light interference function only in the ink layer with abundant light, and excessive use of other colored pigments will cause a large amount of pearlescent light loss

deployment method. Diluent: color ink: pearlescent ink = 75:3:22, the proportion of each can be added or reduced according to the desired effect

operation method: first use diluent and color ink to mix (remember: weigh to find out the proportion), mix it to a little deeper than the required sample by scraping, then add soaked pearlescent powder, stir it evenly, and use it after the pearlescent powder is evenly dispersed in the ink

3. Reasonable use of pearlescent powder on composite paper

for example, printing pearlescent ink on PET composite paper, due to the good smoothness of the paper surface, the establishment and improvement of major project library will reduce the transfer rate of pearlescent ink in the printing process, at the same time, the covering effect is also poor, and the imprinting will show the color of the paper. Then in the process arrangement, we should take into account the free aftercolor sequence, and print twice with pearlescent ink or primer, so that the pearlescent light effect will be more distinctive; There is no empty residual color sequence. Consider adding appropriate aluminum powder, white ink or transparent ink to the pearlescent ink, so that the pearlescent light effect is slightly lost, but the coverage is improved

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