Color concentration
Color concentration is the saturation of color. Now, newspapers are no longer the same as black and white, and more have been replaced with graphic newspapers. Therefore, the user has higher requirements for the color density of offset printing inks for newspapers. The advertisements, pictures, and titles on the color newspaper are more eye-catching, so the color density of the ink needs to be relatively increased. However, the color concentration of many newspaper inks is not ideal. In order to ensure the printing density, printing companies have to increase the amount of ink or increase the percentage of outlets. However, the result of this is bound to cause stacking of ink and increase the use of ink. Increase the amount of ink will also cause the network to be connected. Normal web offset offsets should be controlled at less than 25%. If the ink is large, it will result in loss of levels and excessive increase of outlets. In particular, the increase in the number of outlets will have more obvious consequences. In addition, the problem that has arisen in the past few years is that black ink saturation is insufficient and it still exists, but it is no longer a big problem. The reason for the low concentration of black ink is that when the printing plant prints ordinary text, in order to reduce costs, black ink of low price and poor quality is selected. It is because of this demand that some ink factories naturally produce such inferior ink, which affects the overall quality of the ink.
The reasons for the unsatisfactory quality of domestic ink in terms of color density are as follows: First, most of the current ink factories do not produce their own pigments, but instead purchase domestically-made pigments for grinding. There is still a gap in the quality of domestic pigments and imported pigments; the second is the ink factory. The cost savings and the use of less pigments result in insufficient color saturation of the ink. The key point is that even if the quality and amount of pigments pass, the national standard specifies that the particle size of the ink should not be larger than 15 μm, and the finer it is, The brighter the ink color is. If the processing of the pigment is not good enough, if the size of the ground particles is not suitable, the color density of the ink will also be affected. Of course, the level and color of printed matter is not only related to ink, but also related to the process conditions such as printing plate production, printing equipment, and ink balance, and the quality of ink is also a prerequisite and guarantee for the improvement of printing quality.
Overprinting
There are two main requirements for the chromatographic properties of offset printing inks in newspaper printing. One is the color sequence, and the other is the viscosity of the ink. At present, the standard color sequence for printing in the international newspaper is cyan-magenta-yellow-black, and its viscosity should be gradually reduced. Otherwise, ink pull-back phenomenon will occur. Now some large-scale ink factories have already noticed that according to the printing color sequence pulls out the ink viscosity value, they often communicate with the ink supplier, adjusts the ink nature of the ink in time.
Dryness
The drying speed of the ink will usually affect the printing quality, and at the same time it will cause many printing failures, such as causing the back of the printed material to become dirty, and even causing the web printing to fail. Users generally report that the domestic ink's dryness has a great influence on the quality of the printed matter. Due to the incomplete drying of the ink, defective printed products and waste products are not completely affected by the season and weather.
Printability
In modern printing, the variety of substrates is large, the types of auxiliary consumables are numerous, and the performance difference is also large. Therefore, the requirements for ink are also more complicated. General companies attach great importance to the printability of ink, in order to ensure that the printability of the ink on the machine, to ensure compatibility of ink and a variety of supplies and substrates, often with a fixed number of ink suppliers to maintain contact with their own special requirements Tell the ink supplier. If ordinary offset printing inks are used to print coated paper, the graphic arts printed on the coated paper will have bright colors and good gloss. However, if the same ink is used to print light coated paper, the phenomenon of overprinting will be more serious and the gloss will be reduced, but the market seems to be still There is no special printing ink for light coated paper, so it is hoped that the ink factory can develop corresponding inks according to different substrates, especially new materials commonly used now, such as light coated paper.
In addition, there are differences in the selection of inks among newspaper printing companies. The printing press is an ink-up method, and its performance requirements for inks are relatively high. At present, the performance of domestic inks such as rheology and viscosity cannot fully meet the requirements. Under the ink printing equipment, there are also problems with stencil printing and scumming, and the requirements for pictures and titles in newspapers are relatively high. Therefore, ink manufacturers need to adjust the relative performance of inks according to actual conditions. It can be seen that the printability of offset inks needs to be further adjusted. If each user makes special requests, the ink factory may not be able to cope.
stability
For printers, the stability of the ink is also related to the quality of the printed product. Some companies have used some foreign brands of ink produced in the country. Although the ink formulation is the same as imported products, due to the certain gap between the production conditions and the management level of the domestic ink factory and the original ink production plant, the performance of the ink of the same brand and model is somewhat lower. difference. If the same red ink is used to adjust the ink in the same proportion, there is a clear color difference.
Domestic inks and imported inks still have large gaps in the coloring, environmental protection, and drying speed of inks, and domestic inks have poor fluidity and high viscosity, and sometimes they have to be removed. The printing factory hopes that the ink viscosity can be improved and gradually replace the import of high-grade, high-priced inks. Newspaper printing requires high viscosity and low viscosity in terms of printing effects, and the ink with good transfer performance, especially the high-speed printing press, has higher drying requirements on the ink.
Color concentration is the saturation of color. Now, newspapers are no longer the same as black and white, and more have been replaced with graphic newspapers. Therefore, the user has higher requirements for the color density of offset printing inks for newspapers. The advertisements, pictures, and titles on the color newspaper are more eye-catching, so the color density of the ink needs to be relatively increased. However, the color concentration of many newspaper inks is not ideal. In order to ensure the printing density, printing companies have to increase the amount of ink or increase the percentage of outlets. However, the result of this is bound to cause stacking of ink and increase the use of ink. Increase the amount of ink will also cause the network to be connected. Normal web offset offsets should be controlled at less than 25%. If the ink is large, it will result in loss of levels and excessive increase of outlets. In particular, the increase in the number of outlets will have more obvious consequences. In addition, the problem that has arisen in the past few years is that black ink saturation is insufficient and it still exists, but it is no longer a big problem. The reason for the low concentration of black ink is that when the printing plant prints ordinary text, in order to reduce costs, black ink of low price and poor quality is selected. It is because of this demand that some ink factories naturally produce such inferior ink, which affects the overall quality of the ink.
The reasons for the unsatisfactory quality of domestic ink in terms of color density are as follows: First, most of the current ink factories do not produce their own pigments, but instead purchase domestically-made pigments for grinding. There is still a gap in the quality of domestic pigments and imported pigments; the second is the ink factory. The cost savings and the use of less pigments result in insufficient color saturation of the ink. The key point is that even if the quality and amount of pigments pass, the national standard specifies that the particle size of the ink should not be larger than 15 μm, and the finer it is, The brighter the ink color is. If the processing of the pigment is not good enough, if the size of the ground particles is not suitable, the color density of the ink will also be affected. Of course, the level and color of printed matter is not only related to ink, but also related to the process conditions such as printing plate production, printing equipment, and ink balance, and the quality of ink is also a prerequisite and guarantee for the improvement of printing quality.
Overprinting
There are two main requirements for the chromatographic properties of offset printing inks in newspaper printing. One is the color sequence, and the other is the viscosity of the ink. At present, the standard color sequence for printing in the international newspaper is cyan-magenta-yellow-black, and its viscosity should be gradually reduced. Otherwise, ink pull-back phenomenon will occur. Now some large-scale ink factories have already noticed that according to the printing color sequence pulls out the ink viscosity value, they often communicate with the ink supplier, adjusts the ink nature of the ink in time.
Dryness
The drying speed of the ink will usually affect the printing quality, and at the same time it will cause many printing failures, such as causing the back of the printed material to become dirty, and even causing the web printing to fail. Users generally report that the domestic ink's dryness has a great influence on the quality of the printed matter. Due to the incomplete drying of the ink, defective printed products and waste products are not completely affected by the season and weather.
Printability
In modern printing, the variety of substrates is large, the types of auxiliary consumables are numerous, and the performance difference is also large. Therefore, the requirements for ink are also more complicated. General companies attach great importance to the printability of ink, in order to ensure that the printability of the ink on the machine, to ensure compatibility of ink and a variety of supplies and substrates, often with a fixed number of ink suppliers to maintain contact with their own special requirements Tell the ink supplier. If ordinary offset printing inks are used to print coated paper, the graphic arts printed on the coated paper will have bright colors and good gloss. However, if the same ink is used to print light coated paper, the phenomenon of overprinting will be more serious and the gloss will be reduced, but the market seems to be still There is no special printing ink for light coated paper, so it is hoped that the ink factory can develop corresponding inks according to different substrates, especially new materials commonly used now, such as light coated paper.
In addition, there are differences in the selection of inks among newspaper printing companies. The printing press is an ink-up method, and its performance requirements for inks are relatively high. At present, the performance of domestic inks such as rheology and viscosity cannot fully meet the requirements. Under the ink printing equipment, there are also problems with stencil printing and scumming, and the requirements for pictures and titles in newspapers are relatively high. Therefore, ink manufacturers need to adjust the relative performance of inks according to actual conditions. It can be seen that the printability of offset inks needs to be further adjusted. If each user makes special requests, the ink factory may not be able to cope.
stability
For printers, the stability of the ink is also related to the quality of the printed product. Some companies have used some foreign brands of ink produced in the country. Although the ink formulation is the same as imported products, due to the certain gap between the production conditions and the management level of the domestic ink factory and the original ink production plant, the performance of the ink of the same brand and model is somewhat lower. difference. If the same red ink is used to adjust the ink in the same proportion, there is a clear color difference.
Domestic inks and imported inks still have large gaps in the coloring, environmental protection, and drying speed of inks, and domestic inks have poor fluidity and high viscosity, and sometimes they have to be removed. The printing factory hopes that the ink viscosity can be improved and gradually replace the import of high-grade, high-priced inks. Newspaper printing requires high viscosity and low viscosity in terms of printing effects, and the ink with good transfer performance, especially the high-speed printing press, has higher drying requirements on the ink.
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