Books, periodicals, newspapers, advertising posters, new year pictures and other printed products, under the illumination of sunlight, fluorescent lamps, incandescent lamps and other light sources, can be selectively absorbed and reflected by ink pigments to display colorful and magenta colors. There are many factors that cause discoloration and discoloration of the printed matter. The light resistance of the ink, the acidity and alkalinity of the paper, the temperature, and the arrangement of the printing color sequence are all causes of the discoloration and discoloration of the printed matter.
1. Discoloration of the ink drying process In the printing process, the ink color of the newly printed ink is compared with the ink color of the dried ink. The ink color of the newly printed ink is darker. After a period of time, the ink color will become lighter after the blot is dried. This is not a problem of the ink's resistance to light fading and discoloration. It is mainly due to the discoloration caused by the penetration and oxidation of the conjunctiva during the drying process. Relief ink is mainly based on permeation drying. The product just printed from the printing machine has a thick ink layer. At this time, it will take some time for the permeation and oxidation conjunctiva to dry. Then, a large part of the connecting material in the ink will penetrate into the paper fibers, and the ink layer after the oxidized conjunctiva becomes thinner and the color will become lighter. This is an inevitable phenomenon that is often seen. When printing, the ink color should be controlled to be slightly darker than the original printed sample ink color. When the ink is dry, it will meet the requirements of the sample ink color.
The color rendering mechanism of printed matter is carried out by subtractive color method. Sunlight, fluorescent lamps, incandescent lamps and other light particles are irradiated by the light of the light source on the fine particles of the ink pigment. The colored light reflected by the selective absorption of the light by the pigment can show the brilliant color. The deeper the light penetrates the ink film, The reflected light becomes more saturated, so the thicker the ink layer, the darker the color; the transparency of the ink is good, the color is brighter.
2. The ink itself is not resistant to light and the faded ink will inevitably fade and change color when exposed to light. All inks will fade and change color to varying degrees after being exposed to light. The light-colored ink fades and changes color very seriously after long-term light irradiation. Yellow, magenta, and green fade faster, and cyan, blue, and black fade more slowly. In the actual work, when adjusting the ink, you should try to choose an ink with good light resistance. When you talk about the color, you should pay attention to the light resistance of the ink after dilution. When you mix the ink, you should also consider the consistency of the light resistance between the inks of several colors. Sex. Since outdoor advertising posters easily fade when exposed to sunlight, the lightfastness of the ink must be considered. The same blue ink, phthalocyanine blue is lightfast than light lake blue and peacock blue, and it is not easy to change color. Gray can add black ink and phthalocyanine ink to white ink; emerald green can use monochromatic phthalocyanine green; if it is not yellow enough, light resin yellow ink can be added. If you add a little more white ink, the color will be more vivid. If you use peacock blue with chrome yellow ink, it will easily fade, change color, and yellow.
3. The effect of the acidity and alkalinity of paper on the unpacking and discoloration of ink In general, paper is weakly alkaline. The ideal paper PH value is 7, which is neutral. Due to the need to add caustic soda (NaOH), sulfide, chlorine gas and other chemicals in the papermaking process, improper handling in the pulping and papermaking process may make the paper It is acidic or alkaline. There is a certain amount of residual chlorine and organic acid in the pulp. If the paper is not properly processed, the resulting paper is acidic; if basic fillers and colorants are used in the papermaking process, there are residuals in the pulp Alkaline solution, without the necessary treatment, the paper made in this way is alkaline. â‘ The acidity and alkalinity of paper have a great influence on the printing process and the color durability of the printed matter. The acidity and alkalinity of the paper have a direct effect on the drying of the oxidized conjunctiva of the blot. The drying of the paper with a large acidity is particularly slow. This is because the acidic substance can inhibit the drying of the oxidized conjunctiva of the blot. â‘¡ The acidity and alkalinity of the paper can also cause ink fading and discoloration. The PH value of the raw material paper is acidic when it is less than 7, and it is alkaline when it is greater than 7. Paper with strong acidity and due to the weak acidity of the water bucket solution will affect the ink and cause it to change color, such as malachite blue through acid and become green. . â‘¢ The alkali resistance of the ink is worse. Basically, all inks will fade or change color when they meet alkali. The chrome yellow ink passes the base to red, and the middle basket fades when it meets the alkaline paper. In particular, gold ink, silver ink, and anodized aluminum foil bronzing will lose their original luster when they encounter alkaline substances. The golden color becomes pale yellow, the silver ink becomes black and not bright, and the adhesion decreases, which often causes the printed matter to be scrapped. .
Books, periodicals, newspapers, advertising posters, new year pictures and other printed products, under the illumination of sunlight, fluorescent lamps, incandescent lamps and other light sources, can be selectively absorbed and reflected by ink pigments to display colorful and magenta colors. There are many factors that cause discoloration and discoloration of the printed matter. The light resistance of the ink, the acidity and alkalinity of the paper, the temperature, and the arrangement of the printing color sequence are all causes of the discoloration and discoloration of the printed matter.
1. Discoloration of the ink drying process In the printing process, the ink color of the newly printed ink is compared with the ink color of the dried ink. The ink color of the newly printed ink is darker. After a period of time, the ink color will become lighter after the blot is dried. This is not a problem of the ink's resistance to light fading and discoloration. It is mainly due to the discoloration caused by the penetration and oxidation of the conjunctiva during the drying process. Relief ink is mainly based on permeation drying. The product just printed from the printing machine has a thick ink layer. At this time, it will take some time for the permeation and oxidation conjunctiva to dry. Then, a large part of the connecting material in the ink will penetrate into the paper fibers, and the ink layer after the oxidized conjunctiva becomes thinner and the color will become lighter. This is an inevitable phenomenon that is often seen. When printing, the ink color should be controlled to be slightly darker than the original printed sample ink color. When the ink is dry, it will meet the requirements of the sample ink color.
The color rendering mechanism of printed matter is carried out by subtractive color method. Sunlight, fluorescent lamps, incandescent lamps and other light particles are irradiated by the light of the light source on the fine particles of the ink pigment. The colored light reflected by the selective absorption of the light by the pigment can show the brilliant color. The deeper the light penetrates the ink film, The reflected light becomes more saturated, so the thicker the ink layer, the darker the color; the transparency of the ink is good, the color is brighter.
2. The ink itself is not resistant to light and the faded ink will inevitably fade and change color when exposed to light. All inks will fade and change color to varying degrees after being exposed to light. The light-colored ink fades and changes color very seriously after long-term light irradiation. Yellow, magenta, and green fade faster, and cyan, blue, and black fade more slowly. In the actual work, when adjusting the ink, you should try to choose an ink with good light resistance. When you talk about the color, you should pay attention to the light resistance of the ink after dilution. When you mix the ink, you should also consider the consistency of the light resistance between the inks of several colors. Sex. Since outdoor advertising posters easily fade when exposed to sunlight, the lightfastness of the ink must be considered. The same blue ink, phthalocyanine blue is lightfast than light lake blue and peacock blue, and it is not easy to change color. Gray can add black ink and phthalocyanine ink to white ink; emerald green can use monochromatic phthalocyanine green; if it is not yellow enough, light resin yellow ink can be added. If you add a little more white ink, the color will be more vivid. If you use peacock blue with chrome yellow ink, it will easily fade, change color, and yellow.
3. The effect of the acidity and alkalinity of paper on the unpacking and discoloration of ink In general, paper is weakly alkaline. The ideal paper PH value is 7, which is neutral. Due to the need to add caustic soda (NaOH), sulfide, chlorine gas and other chemicals in the papermaking process, improper handling in the pulping and papermaking process may make the paper It is acidic or alkaline. There is a certain amount of residual chlorine and organic acid in the pulp. If the paper is not properly processed, the resulting paper is acidic; if basic fillers and colorants are used in the papermaking process, there are residuals in the pulp Alkaline solution, without the necessary treatment, the paper made in this way is alkaline. â‘ The acidity and alkalinity of paper have a great influence on the printing process and the color durability of the printed matter. The acidity and alkalinity of the paper have a direct effect on the drying of the oxidized conjunctiva of the blot. The drying of the paper with a large acidity is particularly slow. This is because the acidic substance can inhibit the drying of the oxidized conjunctiva of the blot. â‘¡ The acidity and alkalinity of the paper can also cause ink fading and discoloration. The PH value of the raw material paper is acidic when it is less than 7, and it is alkaline when it is greater than 7. Paper with strong acidity and due to the weak acidity of the water bucket solution will affect the ink and cause it to change color, such as peacock blue and green . â‘¢ The alkali resistance of the ink is worse. Basically, all inks will fade or change color when they meet alkali. The chrome yellow ink passes the base to red, and the middle basket fades when it meets the alkaline paper. In particular, gold ink, silver ink, and anodized aluminum foil bronzing will lose their original luster when they encounter alkaline substances. The golden color becomes pale yellow. .
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