Under the same conditions of paper and ink, due to the problems in the operation process, the gloss of the finished product after printing is often quite different. How to improve the gloss of Shandong packaging printing without considering the post press polishing treatment? Let's take a look at it.
1. Improve the acid wetting solution. The acid wetting solution which has been used for decades in China is mainly chromic acid and phosphoric acid. Although diluted, the pH value is still between 3.5 and 5.6. 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 the emulsion of ink. The excessive emulsification of ink in Shandong packaging printing is mostly caused by too much water and ink in operation. The ink layer appears to be very thick, but the ink molecules become the state of oil in water. The gloss after drying is very poor, and a series of other faults will occur. Water and ink is the most taboo practice in Shandong packaging printing. We should change this situation. 3. Use dry oil correctly. For advanced light fast drying ink, under normal temperature and humidity, it has enough drying capacity. In case of the following circumstances should be added dry oil: first, in the winter temperature and humidity is low; second, the ink must be added in the case of anti adhesion agent, anti adhesion agent, thin inking oil, etc., should be added dry oil. In Shandong packaging printing operation, the correct use of dry oil is very beneficial to the gloss of finished products. This is because it takes a certain 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.
4. Pay attention to powder spraying. Like ink, dusting can also produce condensation, especially in bags or barrels with poor sealing. When the powder is damped, it will agglomerate into larger particles, which will be sprayed on the wet ink imprint, making the surface of the ink layer rough and reducing the original luster. Therefore, attention should be paid to moisture-proof in powder spraying. In addition, there is a heating device on the mechanism of the powder spraying device, which should be checked when using the powder spraying device to see if the heating device fails.
5. Adjust the machine correctly. Whether the thickness of imprinted ink layer of Shandong packaging printing meets the standard also has an impact on the gloss. For example, poor pressure regulation, dot expansion rate is high, ink layer thickness can not reach the standard, the finished product luster is slightly poor. Therefore, to adjust the pressure, so that the dot expansion rate is controlled at about 15%, the ink layer of the printed product is thick, level and open, luster also has.
6. Garfanlishui (No.0 oil). This kind of oil is very viscous and thick. It can adjust the ink concentration of Shandong packaging printing, thicken the thin ink, and increase the gloss of printed matter.
7. Add light paste. Glossy paste is processed from raw materials with high gloss, which can increase the luster of ink, but the dosage should not be too large, otherwise it will reduce the drying speed of ink, sticky dirty, drawing phenomenon, affecting gloss.
8. Add diluent. When some inks are too dark to meet the requirements of spot color printing, it is necessary to lighten them, which can not only make the ink lighter, but also improve the luster of the printed matter.
9. Add 19% resin oil. When the fluidity and transfer performance of the ink are not good, the 19 ා resin oil can be adjusted directly, which can not only improve the ink gloss, but also do not affect the multi-color overprint printing.
After reading the above introduction to improve the Shandong packaging printing gloss method, what do you get? I wonder if I can help you? If you need Shandong packaging printing, please call us..济南印刷厂讲解的内容 更多的内容 请咨询公司官网http://www.xinfengyinshua.cn/