The printing factory's experience on imposition and ink preparation

Printing companies generally use two methods in imposition for products with more than two pieces. If the pattern between the two pieces can be seamlessly connected, try to use a one-size-fits-all post-press processing method, and do not leave a gap in the middle, because the one-size-fits-all method can save paper and also save the application of making the die, and there are Conducive to cleaning up after die-cutting, killing three birds with one stone. However, if the pattern between the two fights cannot be seamlessly connected. Or because of the limitation of the shape of the two products, it is impossible to achieve one-size-fits-all, so generally at least 4mm wide row of knife positions should be left between the two products, and each product must have at least a 2mm pattern bleeding.

In summary, the printing factory can flexibly and cleverly perform the imposition, which can not only save costs, but also avoid the negative impact of the imposition on the die cutting process.

The preparation of ink is one of the important links in the printing process. The quality of the ink preparation directly affects the quality of the printed product. The following is the printing factory's experience of ink distribution, I hope to discuss with you.

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

First, we must carefully analyze the primary color draft, analyze the primary color draft according to the principle of the three primary color inks, and determine the color of the primary ink and secondary ink of the color draft. Theoretically speaking, according to the principle of trichromatic ink, any complex color can be prepared. But in actual work, it is not enough to use the three primary colors ink to match the color required by the customer. Therefore, in practical applications, more than ten kinds of inks such as deep yellow, medium yellow, light yellow, dark blue, medium blue, light blue, light blue, deep red, red, orange, light red, green ink, etc. must be used to meet the requirements.

Secondly, after the hue is adjusted, when adjusting the brightness, we usually encounter two situations: too high brightness and insufficient brightness. Brightness is too strong, you can add a strong color of the appropriate hue or simply add black or white to reduce the brightness. Insufficient brightness, you can add some white ink or light color ink of suitable hue to enhance its brightness. For example, we think that the yellow brightness is too strong, in order 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 distributing ink, we must also consider what type of printing machine is used in the printing process.

The performance of each type of printing machine is different, so the issues to be paid attention to when distributing ink are also different. For example: when distributing ink for offset presses, it should be noted that the color of the ink is darker than the original color when the sample is spread. Because there is no printing pressure when the sample is expanded, its ink layer is always more vain. When printing, the rubber exerts a lot of pressure on the paper, the ink layer is strong and even, and the actual ink volume is less than the extension. The thin ink layer results in poor coloring power.

Third, you must also understand the type of paper when mixing ink

Use loose-textured, rough-surfaced paper with a large capillary absorption force, which can increase the ink absorption capacity. Pay attention to increase the amount of ink when mixing ink. Use smooth and strong paper, such as coated paper, and use less ink. Care should be taken to reduce the amount of ink used to avoid waste.

Fourth, we must also consider the issue of printing press pressure

If the printing press has a large pressure and the layout is flat, it can make the printed ink layer uniform and strong, even, and the printing plate has no flower phenomenon. The pressure of the machine is low, and the force on the plate is insufficient, making the imprinted ink layer floating and not solid, and the printing plate occurs. You can only increase the amount of ink to change the state of the printing plate. This means that the same printing plate and paper require more ink to print on a machine with less pressure than a machine with high pressure. Therefore, the printing plate with a larger plate pressure is generally printed on a round flattening machine, which is not only beneficial to improve the quality of the product, but also saves ink.

To sum up, it is the printing factory's experience of printing inks, and I hope to discuss with you.

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