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Yuan Lei told you | Ink deployment is one of the important links in the printing process

Release time:

2024-01-29 09:38

 

Yuan Lei told you | Ink deployment is one of the important links in the printing process

 

The printing factory flexibly and skillfully carries out the imposition, which can not only save the cost, but also avoid the bad influence caused by the imposition to the die cutting process.

 

Several Problems Should Be Noted in the Distribution of Ink

 

The deployment of ink is one of the important links in the printing process. The quality of the ink deployment directly affects the quality of the printed product. The following is a little experience of printing ink distribution, I hope to discuss with you.

 

When 1. the ink, you must pay attention to: hue, lightness and chroma.

 

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

 

Secondly, after the hue is adjusted, when the lightness is adjusted, we usually encounter two situations: the lightness is too strong and the lightness is insufficient. If the lightness is too strong, you can add strong colorants with appropriate hue 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 suitable hue to enhance its lightness. For example, we think the yellow lightness is too strong. In order to reduce the lightness, we can add a little purple. Finally, to adjust the color of the oil color, when the color is too strong or too pure, you can add gray or black ink, or add complementary color ink, if the color is too gray, then you should add pure strong color ink.

When 2. the ink distribution, you must also consider what type of printing machine is used in the printing process.

 

The performance of each printing machine is different, so the problems to be paid attention to when dispensing ink are also different. For example: for offset printing machine with ink, should pay attention to the extension of the sample when the ink color is darker than the original color. Because there is no printing pressure when expanding the sample, its ink layer is always relatively empty. When printing, the rubber has great pressure on the paper, the ink layer is strong and uniform, and the actual ink volume is less than the extension sample. The ink layer is thin and the tinting strength is poor.

 

3. with ink also want to understand the variety of paper.

 

The use of loose texture, rough surface of the paper, capillary adsorption, can increase the ability to absorb ink, with the ink should pay attention to increase the amount of ink. Use a smooth and strong paper such as coated paper, and use less ink. Should pay attention to reduce the amount of ink, so as not to cause waste.

 

4. also take into account the size of the printing press pressure problem.

 

The printing press pressure is large and the layout is flat, which can make the imprinting ink layer flat, strong and uniform, and the printing plate has no flower phenomenon. The pressure of the machine is small and the force of the layout is insufficient, which makes the ink layer empty and weak, resulting in the occurrence of printing plates. Only increasing the amount of ink can be used to change the state of printing plate hair and bottom. This means that the same printing plate and paper, printing on a machine with low pressure is more than the amount of ink required for printing on a machine with high pressure. Therefore, the printing plate with large layout pressure is generally printed on the circular flattening machine, which is not only beneficial to improve the quality of the product, but also can save ink.

 

 

To sum up, it is a little experience from the printing factory when printing ink, and I hope to discuss it with you.

 

Rational Application of Pearlescent Powder in Printing Process

 

This time we are mainly talking about the rational use of pearl powder in the printing process

 

1. How to use pearl powder safely

 

Pearlescent powder is a translucent micro-flake pigment. Operators accidentally inhaled into the lungs, will bring the corresponding damage to the body. It is suggested that the operator should wear a mask and rubber gloves before mixing pearl powder, open the package and gently put the required amount into the tank (barrel), and then soak in 30% ethyl acetate or isopropyl alcohol for 30 minutes, which is easy to operate, but should not be stirred at high speed, otherwise the particle size of pearl powder will be destroyed and its gloss will be affected.

 

2. How to mix pearlescent powder with pigment

 

Gravure printing mainly uses low viscosity liquid inks. The deployment of pearlescent pigments should choose a higher transparency of the binder (resin) and printability better transparency of the diluted agent. In the preparation of color ink, according to different paper to choose different types of color ink. White card, white board paper should choose pigment type pigment, PET composite paper should choose dye type pigment. Pigment and pearlescent powder can be mixed, generally not more than 20% of the pearlescent powder. If the tone is too heavy will affect the pearlescent effect, because the pearlescent pigment only in the light of the ink layer can have a special light interference function, and excessive use of other colored pigments will make a lot of pearlescent light loss.

 

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

 

Operation method: first, mix the diluted agent and color ink (remember: weigh to find out the proportion), mix it slightly deeper than the required sample by scraping, then add soaked pearl powder, stir evenly, and use it after the pearl powder is evenly dispersed in the ink.

 

3. The rational use of pearlescent powder on composite paper

 

For example, printing pearlescent ink on PET composite paper, due to the good surface smoothness of the paper, the transfer rate of pearlescent ink is reduced during the printing process, and the covering effect is also poor, and the imprint hair is exposed to the color of the paper. Then in the process arrangement, it is necessary to take into account the spare color sequence and print pearlescent ink or backing oil twice, so that the pearlescent light effect will be more distinct. There is no spare 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 covering rate is improved.

 

 

 

 

 

 

 

Blending, ink, printing, use, pearlescent powder, color, lightness, paper, adding

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