In the process of gravure printing, there are several reasons for the phenomenon of fog printing plate, film, printing environment, ink and so on. This article analyzes the reasons of how these factors cause foggy version for reference.
The reason for the printed version
The technical level of domestic gravure manufacturers varies greatly. Due to the current limitation on the delivery time of printing, printing companies have little time for plate-making enterprises. In the last link of plate-making, the polishing process is easy to neglect. This negligence often leads to foggy printing problems in Guangzhou printing: In addition, the printing plate has been printed for a long time and worn by a metal scraper, and the non-graphic text of the printing plate has produced shallow dots, so the problem of fogging is produced.
Reasons for printing film
At present, there are many manufacturers of bopp film in China. Due to the differences in the processes, formulations and additives added by each manufacturer, some films are not flexible enough, and the printing plate will be abraded during the long-term printing process, causing the printing plate Shallow dots are produced, and the foggy problem gradually occurs.
Reasons for the printing environment
The environment of the printing plant has a great influence on the quality of gravure printing products, especially in seasons where the temperature and humidity change greatly and in the harsh printing environment (such as low temperature and low humidity, it is easy to produce electrostatic pollution).
Causes of ink
Other external reasons are easier to solve. The problem of fogging caused by the ink itself is difficult to solve. This is a problem faced by the ink industry. In general, there are the following methods to solve the haze problem caused by the gravure ink itself.
1. Try to design a suitable resin ratio according to the different characteristics of raw materials
The variety of raw materials is different, and the difference between them is very large. Even if the same pigment variety is different after post-processing, its own properties are also very different. This requires the formula designer of the composite ink to design the formula of the composite ink. Fully tested? This difference.
Due to the different requirements of various colors of ink in the printing process, when designing the formula, the proportion of various synthetic resins in the ink formula should be designed according to the characteristics of the pigment, that is, oil absorption, coloring power, dispersion performance, etc. This can be determined by experiment.
In general, serious fogging problems can often be solved by improving the fluidity of the ink. The reason is that after improving the fluidity of the ink, that is, low viscosity printing. Reduce the impact of ink on the blade, so that the blade can clean the blank part of the ink very cleanly.
2. Scientific application of body pigments
Adding body pigments (such as ymt ultrafine powder, ymt ultrafine barium sulfate, cc-65 powder, fh-95 powder, etc.) to the formula is not only a matter of reducing costs. After adding body pigments, it is filled in The pigment-encapsulated resin further strengthens the body of the ink, reduces the viscosity of the ink at the same printing viscosity, and improves the scraping performance of the doctor blade.
3. The most current use of wax powder and ok-412 matte powder to solve the fog version problem
Wax powder and matte powder ok-412 is an effective additive to reduce the fogging problem. Its particles are easily released on the surface of the ink, which enhances the scraping performance of the doctor blade.
However, the method of adding wax powder and ok-412 matte powder to many manufacturers often fails to solve the problem of plate fog. It is recommended that the wax powder and ok-412 matte powder be made into semi-finished products, and the fineness of the ink grinding is qualified After that, after high-speed dispersion and addition, and without grinding, it will reduce the effect of solving the haze problem.
4. Use suitable wet dispersion additives to improve the compatibility of pigments and synthetic resins
The purpose of adding wetting and dispersing additives in the formulation is to solve the problems in the formulation system, including poor pigment dispersion, poor coating of various synthetic resins, and poor stability of the system itself, and these problems are solved If it is not good, it will often cause the problem of plate fog. It is recommended to use l-18 dispersant and gk-208 auxiliary to disperse black, blue, red and other pigments.
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