Imposition tips
When packaging and printing plants make packaging cartons, post-sequential die cutting of printed products is a very important part of the production process. When a printing press uses a flat-pressing automatic die-cutting machine to perform die-cutting processing, the phenomenon that the edge of the carton after the die-cutting is not smooth may often occur, which naturally will affect the appearance of the product more or less. The main reason affecting the appearance of the product is that when the die-cutting processing is performed on the flat-pressing automatic die-cutting machine, it is necessary to break several small-mouthed cutters by the edge of the knife, so as to smoothly pull the die-cut finished product out of the machine. The broken mouth is reflected in the die-cut box is not smooth edges.
The solution is mainly to put the bonding of the carton on the side of the mouth as far as possible in the imposition. After a clever make-up, the appearance of the carton that is shaped by grinding is beautiful.
For two or more products, the printing factory generally uses two methods in the imposition. If the pattern between the two spells can be seamlessly connected, a one-off post-printing method should be used as far as possible, and no gaps should be left in the middle, because a one-knife approach can save paper and can also save the application of making die patterns. It is beneficial to die-cutting after die-cutting. But if the pattern between the two spells cannot be seamlessly connected. Or by the limitations of the two product shapes, can not be achieved across the board, then between the two products generally have to leave at least 4mm wide row knife position, and each product should have at least 2mm pattern bleeding.
To sum up, the printing house can flexibly and intelligently make impositions, which can not only save costs, but also avoid the bad influence brought by die-cutting to die-cutting processing.
Some points to note when dispensing ink
The deployment of ink is one of the important links in the printing process. The quality of ink preparation directly affects the quality of printed products. The following is a little experience of the printing factory on ink distribution, and we hope to discuss it with you.
First, when adjusting ink, you must pay attention to: hue, lightness, and color.
First of all, we must carefully analyze the original color draft, analyze the original color draft according to the principles of the three primary color inks, and determine the color of the main ink of the color draft and the color of the auxiliary ink. In theory, according to the principle of three primary colors, any complex color can be deployed. However, in actual work, it is not enough to use only the three primary colors of ink to match the colors requested by customers. Therefore, more than ten kinds of inks, such as deep yellow, medium yellow, light yellow, dark blue, medium blue, light blue, blue light, dark red, red, orange, light red, and green ink, must be used to meet the practical requirements.
Secondly, after adjusting the hue, when performing lightness deployment, we usually encounter two situations: lightness and lack of lightness. Brightness is too strong, you can add a strong hue with proper hue or simply add black or white to reduce lightness. The lack of lightness can be enhanced by adding some white ink or a light color ink of a suitable hue. For example, we feel that the yellow color drawn out is too strong. To reduce the brightness, we can add a little purple. Finally, adjust the chroma of the oil paint. 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, you should add pure strong color ink.
Second, when dispensing ink should also consider what type of printing press used in the printing process.
The performance of each press is different, so the problems to be noticed when dispensing ink are different. For example, when ink is used in an offset printing machine, it should be noted that the color of the ink during the deposition is deeper than the original color. Because there is no printing pressure during the topography, its ink layer is always floating. In the printing, the pressure of the rubber on the paper is very large, the ink layer is even and solid, and the actual amount of ink is less than that of the topography. Thin ink, poor coloring power.
Third, we must understand the type of paper when we ink.
The use of texture loose, rough surface paper, capillary adsorption force, can increase the ability to absorb ink, in the ink should pay attention to increase the amount of ink. Use smooth, solid paper like coated paper, with less ink. Should pay attention to reduce the amount of ink, so as to avoid waste.
Fourth, we must also take into account the pressure of the printing press.
Large pressure printing press is flat, can make the imprinted ink layer flat and solid, even printing plate phenomenon. Small machine pressure, lack of layout force, so that the imprint ink layer is not strong and floating, resulting in the occurrence of printing plates, can only be used to increase the amount of ink to change the state of the bottom of the printing plate. This means that the same printing plate and paper will print more on a less stressed machine than on a more stressed machine. Therefore, printing plates with a large plateau pressure are generally printed on a round flattening machine, which not only improves the quality of the product, but also saves ink.
To sum up, it is the experience of the printing factory when it comes to printing and ink distribution. We hope to discuss it with everyone.
The rational application of pearl powder in the printing process
This time we mainly talked about the rational use of pearl powder in the printing process.
1, how to use pearl powder safely
Pearl powder is a translucent microflake pigment. Inadvertent inhalation of the lungs by the operator will cause corresponding injuries to the body. It is recommended that operators wear masks and rubber gloves before dispensing pearl powder. Open the package and gently put the required amount into the can. After soaking with 30% ethyl acetate or isopropyl alcohol for 30 minutes, it is easy to Operation, but not high-speed stirring, otherwise it will destroy the pearl powder particle size and affect its gloss.
2. How to use pearl powder mixed with pigment
Gravure printing mainly uses low-viscosity liquid inks. The pearlescent pigments should be blended with a transparent material (resin) with good transparency and a transparent diluting agent with good printability. In the preparation of color inks, according to different papers choose different color ink types. White card, white paper should use pigment type color material, PET composite paper should use dye type color material. Color and pearl powder can be mixed, generally not more than 20% of pearl powder. If the hue is too heavy, it will affect the pearlescent effect, because the pearlescent pigment can only have special light interference function in the well-lighted ink layer, and excessive use of other colored pigments will cause a large amount of pearlescent light to be lost.
Method of deployment. Diluter: color ink: pearlescent ink = 75:3:22, depending on the desired effect to add or reduce the proportion of each.
Operation method: First use dilute agent and color ink for deployment (remember: to find out the proportion to be weighed), deploy the sample to be slightly deeper than the required sample draft, then add the soaked pearl powder, evenly stir, and other pearl powder It can be used after it is evenly dispersed in the ink.
3, the rational use of pearl powder on the composite paper
For example, pearlescent inks are printed on PET composite paper. Because the smoothness of the surface of the paper is good, the transfer rate of pearlescent ink is reduced during the printing process, and at the same time, the hiding effect is also poor, and the printed hair reveals the paper color. So in the process of arrangement to take into account the vacant color sequence, printing two times pearlescent ink or base oil, so that the pearlescent light effect will be more clear; no empty color sequence, consider adding appropriate aluminum powder, white ink or transparent pearl ink Ink, so that the pearlescent light effect is slightly lost, but increased coverage.