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來源:http://www.lyjinshayun.com/   發布時間:2021-07-26
Gloss, as a kind of visual information, can have an important impact on people's mental state, emotion and many other spiritual aspects. Therefore, people's research on color has begun very early. For the printing industry, whether a printed product has gloss is particularly important. So how to effectively improve the gloss of printed matter without considering the post press polishing treatment? Now, let's take a look.
1. Improve acid wetting solution.
It is mainly chromic acid and phosphoric acid. The stronger the acidity, the greater the decomposition and corrosion 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 amount of water and ink in operation. The ink layer looks very thick, but the ink molecules become oil in water. After drying, the gloss is very poor, and a series of other faults will occur. Water and ink are mostly taboo practices in offset printing.
3. Add appropriate auxiliary agent in the ink.
Adding appropriate auxiliary agents to the ink can adjust the printability of the ink for smooth printing. Most auxiliary agents will have an adverse impact on the gloss of the finished product. For example, the main raw material of the anti adhesion agent is Liugu powder. After adding ink, the surface of the imprinted film becomes rough due to the precipitation of corn flour, and the gloss of the finished product is poor.
4. Use dry oil correctly.
For advanced bright quick drying ink, it has sufficient drying capacity under normal temperature and humidity. If the temperature and humidity are low in winter or the ink must be added with anti adhesion agent, de adhesion agent, thin ink blending oil, etc., the drying oil shall be added. In the process operation, the correct use of dry oil is very beneficial to the formation of luster of the finished product. This is because it takes some time for the paper to absorb the binder. In this process, it is the key to make the binder agglomerate as soon as possible until the conjunctiva is dry.
5. Pay attention to powder spraying.
Like ink, powder spraying will also produce condensation, especially in bags or barrels with poor sealing. After powder spraying is damp, it will condense into larger particles and spray them on the wet ink imprint, making the conjunctiva on the surface of the ink layer rough and reducing the original luster. Therefore, powder spraying should pay attention to moisture-proof. In addition, there is a heating device on the mechanism of the powder spraying device. When using the powder spraying device, check whether the heating device fails.
In addition, the correct adjustment of the machine can also improve the gloss of printed products. Whether the thickness of the imprinted ink layer meets the standard also has an impact on the gloss. Therefore, the pressure should be adjusted well to control the dot expansion rate at about 15%. The ink layer of the printed products is thick and open, and the gloss will naturally be improved.
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