This is a kind of auxiliary agent for light-colored ink. Its main function is to reduce the color strength of the ink, while basically maintaining the ink's ink properties (viscosity, fluidity) and printing performance.

Such auxiliary agents include white ink with strong hiding power, transparent and translucent white oil, velvet oil evening, brightening paste, and zero oil. At the same time there are diluents in solvent inks, inks and so on. This is an auxiliary agent necessary to achieve a certain process design, and their respective properties are very different, so care should be taken during use.

White ink, each type of ink has its own white ink, it has strong diluting power and heavy texture. If it can be used in a large amount in letterpress, then light color should be used less in offset printing, or it should be used in combination with transparent or translucent type. If it is used in large amounts, the transferability and printing effect will be poor. Especially when printing appears cloud-like spots, at the same time, the hydrophilicity of titanium dioxide easily causes emulsification, dirty plates and other problems. It is true that white ink is an indispensable dilution material.

White oil is also used for diluting, mainly used in oil-type and oleoresin-type inks, both offset printing and lead printing are available.

One is a dispersible paste-like translucent body, which is formed by dispersing aluminum hydroxide, barium sulfate, and titanium dioxide in ink and wax oil. This material can be used in higher grade products with light colors or primer.

One is an emulsified paste-like translucent body, which is made by heating and saponifying magnesium carbonate, stearic acid and polymer oil. The cost is low and the process is relatively simple, but it is unstable and has a great impact on printing performance. It can only be used for low-grade printing or processing paper surface.

As for their dosage, it depends on the requirements of the light color. Fine prints are not suitable, so as not to affect the gloss and other quality, at the same time, it must be equipped with dry oil or other methods to speed up drying (such as heat).

Transparent oil (Weili oil), which is a large amount and widely used auxiliary agent for dilution, which is characterized by good transparency, excellent printing performance, and the disadvantage is that it affects drying. It is a transparent paste formed by dispersing aluminum hydroxide with suitable water content in the connecting material through a three-roll ink press. It is light in color, similar to offset printing, lead printing ink, and also known as colorless ink. The only reason why the connecting material can be transparent is because the refractive index of aluminum hydroxide is close to or equal to that of the connecting material.

The types of linking materials have expanded from pure oil type to resin type. The material made of transparent colloidal calcium carbonate matched with aluminum hydroxide or used alone, and the improved auxiliary agent is much better than the transparent oil made of pure aluminum hydroxide and polymer oil to increase the viscosity of the ink and increase the gloss.

Transparent oil is generally used to prepare light-colored inks for offset or lead printing. It has little effect on color, and it can also play a good role in gloss and printability on general printed parts. However, it should be noted that since the aluminum hydroxide-based amphoteric hydroxide reacts with acids and alkalis, it can cause the ink to gel and swell. Therefore, if you want to use it now, the prepared ink should not be stored for a long time. In addition, if you use it to dilute gold, red, blue, iron blue, blue lotus and other inks, it will cause dullness or fading. Taboo use. At the same time, due to poor water resistance in offset printing, it will also cause emulsification and other problems.

In addition to diluting, No. 0 oil is mainly used to adjust the thin and flowing ink body.

Another type of product in the diluent (desalting agent) is derived from special production according to the high quality requirements of the product and the need to adjust the ink properties. Such as light pulp, light desalting agent, etc.

Most of this type of diluent is a paste-like transparent body made of rosin modified phenolic resin, gel-forming material, dry vegetable oil, ink oil, etc., or in addition to the above materials, dispersed calcium carbonate and other materials , Into a translucent paste adhesive body. It is used in conjunction with high-grade inks and light-colored inks. At the same time, it has good brightness, good water resistance and printability, which can play a role in brightening the printed matter and increasing the three-dimensional impression of the printed matter. Some exquisite prints and trademarks are used. At the same time, the amount of ink within 3% can also be adjusted to the ink that is large and not too sticky.

When using this type of diluent, you should pay attention to two points: First, with light-colored inks, such as small red, small blue, etc., when printing on highly permeable coated paper, generally do not add dry oil; if the temperature is low, If the humidity is high, or the print is not long, generally no longer need to add dry oil; if the temperature is low, the humidity is high, or the print is not long, depending on the print pattern, it must be matched with 0.5-3% white dry oil, or Red oil should be reduced appropriately. 2. If you feel that the viscosity is large and thin, a small amount of detackifier must be added; if the viscosity is high and the ink is thick, you must mix it with a resin thinner. 3. The dosage is based on the color diluted to the desired color.

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