1. The reason for the printed version: The technical level of the domestic intaglio manufacturers is very different. Due to the shorter and shorter print delivery deadlines, the time spent by the printing companies for the platemaking companies is very small. That is, the polishing process is easy to be neglected. This oversight often brings about the fog problem in printing. In addition, the printing plate undergoes long-time printing and wears through metal scrapers, and the non-graphics of the printing plate produce shallow dots. , so that the problem of fog version was created.
2. Reasons for Printing Film: At present, there are many manufacturers of BOPP film in China. Due to the differences in the processes, formulas, and added auxiliaries produced by various manufacturers, some films are not flexible enough and will be used during the long-term printing process. Abrasion of the printing plate causes the printing plate to produce shallow dots, gradually causing problems with the fog plate.
3. Reasons for the printing environment: The printing environment has a great influence on the quality of intaglio printing products, especially in seasons where the temperature and humidity are greatly changed and in bad printing environments (such as when the temperature is low and the humidity is low. Easily generate static electricity.)
4. Causes of Ink: Other external causes are easier to solve. The problem of ink fog is difficult to solve due to the ink itself. This is a problem faced by the ink industry.
Second, how to solve the problem of fog plate caused by gravure ink itself
1. Try to design a suitable resin ratio based on the different characteristics of the raw materials:
Different varieties of raw materials, the difference between itself is very large, even if the same pigment varieties after post-processing is different, the nature of the difference is also very large, which requires the compound ink formula designer in the design of composite ink formulations, Fully test this difference. Due to the different requirements of various colors of ink in the printing process, the proportion of various synthetic resins in the ink formulation should be designed according to the characteristics of the pigments, ie the oil absorption, tinting strength, dispersion properties, etc., when designing the formulation. This can be determined by experimentation. In general, severe fog issues can often be resolved by improving the flow of the ink. The reason for this is the improvement of ink flow, which is low viscosity printing. Reduce the impact of the ink on the blade, so that the blade can cleanly scrape the blank part of the ink.
2. Scientific application of organic pigments
Adding body pigments to the formula (such as YMT ultrafine powder, YMT ultrafine barium sulfate, CC-65 powder, FH-95 powder, etc.) is not only a problem of cost reduction in Colo. The resin encapsulating the pigment further enhances the body of the ink, reduces the viscosity of the ink at the same printing viscosity, and improves the squeegee performance of the blade.
3. The most current use of wax powder and OK-412 matt powder to solve fog problem
Wax powder and matte powder OK-412 is an effective additive to reduce the problem of fog plate. The particles can easily be released on the surface of the ink and enhance the scraping performance of the blade. However, many manufacturers add wax powder and OK-412 matt powder method will not be able to solve the problem of version fog, it is recommended to be made of wax powder and OK-412 matte powder into semi-finished products, the fineness of the ink grinding qualified After being added at high speed and without grinding, the effect of solving the fog plate problem will be reduced.
4. Use suitable wet dispersing aids to improve the compatibility of pigments and synthetic resins
The purpose of adding wetting and dispersing aids to the formulation is to solve the problems in the formulation system, including the poor dispersion of pigments, poor coating of pigments by various synthetic resins, and poor stability of the system itself, and these problems are solved. Inadequate results often cause fog problems. It is recommended to use L-18 dispersant and GK-208 additives to disperse black, blue and red pigments.
5. The use of additives to solve the problem of fog plate According to foreign countries in the high-speed printing plate fog problem solving experience, it is recommended to use AK-505 additives It is to reduce the complex ink and the chromium layer affinity, is not easy ink Adhere to the plate. At present, many domestic manufacturers have good results.
6. Using a New Resin System to Design Formulas
As mentioned earlier, CL-PP composite inks are more prone to fog problems. It is recommended to use BK-6380 resin system instead of CL-PP system.
2. Reasons for Printing Film: At present, there are many manufacturers of BOPP film in China. Due to the differences in the processes, formulas, and added auxiliaries produced by various manufacturers, some films are not flexible enough and will be used during the long-term printing process. Abrasion of the printing plate causes the printing plate to produce shallow dots, gradually causing problems with the fog plate.
3. Reasons for the printing environment: The printing environment has a great influence on the quality of intaglio printing products, especially in seasons where the temperature and humidity are greatly changed and in bad printing environments (such as when the temperature is low and the humidity is low. Easily generate static electricity.)
4. Causes of Ink: Other external causes are easier to solve. The problem of ink fog is difficult to solve due to the ink itself. This is a problem faced by the ink industry.
Second, how to solve the problem of fog plate caused by gravure ink itself
1. Try to design a suitable resin ratio based on the different characteristics of the raw materials:
Different varieties of raw materials, the difference between itself is very large, even if the same pigment varieties after post-processing is different, the nature of the difference is also very large, which requires the compound ink formula designer in the design of composite ink formulations, Fully test this difference. Due to the different requirements of various colors of ink in the printing process, the proportion of various synthetic resins in the ink formulation should be designed according to the characteristics of the pigments, ie the oil absorption, tinting strength, dispersion properties, etc., when designing the formulation. This can be determined by experimentation. In general, severe fog issues can often be resolved by improving the flow of the ink. The reason for this is the improvement of ink flow, which is low viscosity printing. Reduce the impact of the ink on the blade, so that the blade can cleanly scrape the blank part of the ink.
2. Scientific application of organic pigments
Adding body pigments to the formula (such as YMT ultrafine powder, YMT ultrafine barium sulfate, CC-65 powder, FH-95 powder, etc.) is not only a problem of cost reduction in Colo. The resin encapsulating the pigment further enhances the body of the ink, reduces the viscosity of the ink at the same printing viscosity, and improves the squeegee performance of the blade.
3. The most current use of wax powder and OK-412 matt powder to solve fog problem
Wax powder and matte powder OK-412 is an effective additive to reduce the problem of fog plate. The particles can easily be released on the surface of the ink and enhance the scraping performance of the blade. However, many manufacturers add wax powder and OK-412 matt powder method will not be able to solve the problem of version fog, it is recommended to be made of wax powder and OK-412 matte powder into semi-finished products, the fineness of the ink grinding qualified After being added at high speed and without grinding, the effect of solving the fog plate problem will be reduced.
4. Use suitable wet dispersing aids to improve the compatibility of pigments and synthetic resins
The purpose of adding wetting and dispersing aids to the formulation is to solve the problems in the formulation system, including the poor dispersion of pigments, poor coating of pigments by various synthetic resins, and poor stability of the system itself, and these problems are solved. Inadequate results often cause fog problems. It is recommended to use L-18 dispersant and GK-208 additives to disperse black, blue and red pigments.
5. The use of additives to solve the problem of fog plate According to foreign countries in the high-speed printing plate fog problem solving experience, it is recommended to use AK-505 additives It is to reduce the complex ink and the chromium layer affinity, is not easy ink Adhere to the plate. At present, many domestic manufacturers have good results.
6. Using a New Resin System to Design Formulas
As mentioned earlier, CL-PP composite inks are more prone to fog problems. It is recommended to use BK-6380 resin system instead of CL-PP system.
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