Under the conditions of the same paper and ink, due to the problems in the operation process, the finished product luster is often different after custom hard-cover book and soft-cover book. Without considering the premise of polishing treatment after printing, then what are the ways to improve the gloss of the album? Let's take a look!

1, improve the acid wetting fluid

The acidic wetting liquid used in China for decades is mainly chromic acid and phosphoric acid, although diluted, the PH value is still between 3.5 and 5.6. The stronger the acidity is, the greater the resolving power and corrosive power of ink binder and pigment, resulting in rough surface of imprinted film and reduced gloss.

2, reduce ink emulsification

The excessive emulsification of ink in offset printing is mostly caused by large amounts of water and ink in the operation, and the ink layer looks very thick, but the ink molecules have become a state of oil in water, and the luster is very poor after drying, and a series of other failures will occur. Large ink is a very taboo in offset printing, to change this situation, in addition to the quality of operation and technical improvement, it is recommended to use wetting powder, because it has better performance, even if the layout moisture is smaller, it is not easy to dirty. It is easy to operate and makes the finished product shiny.

3, the correct use of dry oil

For advanced bright fast drying ink, under the condition of normal temperature and humidity, it has enough drying capacity. In case of the following situations should be added drying oil: first, in the winter temperature, humidity is low; The second is that the ink should be added in the case of anti-stick agent, removal agent, thin ink oil, etc., should be added to the drying oil. In the process operation, the correct use of dry oil is very beneficial to the formation of gloss in the finished product. This is because the paper takes a certain amount of time to absorb the binder, and in this process, the binder condenses as soon as possible until the conjunctiva is dry, which is the key to the finished product's good luster.

4. Add the diluent

When some ink color is too deep to meet the requirements of spot color printing, it needs to be lightened, which can not only make the ink lighter, but also improve the gloss of the printing product.

5. Add glossy paste

The gloss paste is processed from raw materials with high gloss, which can increase the gloss of the ink, but the amount should not be too large, otherwise it will reduce the drying speed of the ink, and the phenomenon of sticky and dirty and drawing will affect the gloss.

6. Adjust the machine correctly

Whether the thickness of the imprinted ink layer meets the standard also has an impact on the gloss. For example, the pressure regulation is poor, the dot expansion rate is high, the ink layer thickness is not up to standard, and the finished product luster is slightly poor. Therefore, the pressure should be adjusted well, so that the expansion rate of the dot is controlled at about 15%, the ink layer of the printed product is thick, the layer is pulled open, and the luster is also there.

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