The formation of gold and silver ink color is developed by copper, zinc, aluminum metal powder, which is the main body of the ink. Because of their granular properties, the gold and silver inks have better adhesion, viscosity, and fluidity than ordinary inks. If the printability cannot be grasped, it is easy to produce unfavorable conditions such as dull color, uneven ink, crystallization of the print, stencil, and discoloration.
1. The gold and silver inks are dull and lacking in metallic luster. The chemical properties of gold and silver powders in gold and silver inks are generally not stable enough. When acid, alkali, water vapor, sulfide gas and carbonic acid gas are encountered, they will produce A certain degree of chemical change makes the printing ink lack metallic luster. The metal's color change pattern changes from golden yellow to reddish brown, which in turn turns blackish. Because the red copper oxide can be generated when the copper is oxidized, it becomes black copper oxide after further oxidation. In addition, the gold powder is easily converted to copper carbonate under the conditions of relatively concentrated carbon dioxide gas and high humidity, and the gold ink on the printed product gradually becomes dark. After the discoloration of the silver ink, it was slightly grayish and lacked a silver metallic texture. In order to prevent the occurrence of the above-mentioned unfavorable conditions, gold powder and silver powder for gold and silver inks shall be prepared. During use and storage, heat, moisture and contact with acid-alkali substances shall be avoided. Unfinished gold and silver powders shall be sealed to ensure their quality. The stability is a condition. In addition, if the amount of gold and silver ink is too much, the use of time is too long, the speed of the printer is too fast, the number of branches using the rubber roller is too much, and the contact pressure between the ink rollers is too high, the ink is easily oxidized and blackened and darkened. The pH value of the paper is in a slightly acidic state. For example, offset paper, white paper, and paperboard generally have the characteristic of being acid-saturated. After the printing, the chemical reaction easily occurs and the gold and silver ink layers on the paper lose their metallic luster and brightness. In order to reduce or prevent the occurrence of printing defects, the gold and silver inks should be used with adjustments. Generally, it is appropriate to print three or four hours at a time. The speed of the printer is controlled at 2500 to 3,000 sheets per hour; two ink rollers are used. The glue should be softer, and the height should be aligned with the front and back (that is, in contact with the iron roller) so that the contact pressure is too heavy to aggravate the frictional heat and the black oxidation becomes dark. Gold and silver ink printing papers are preferably made of glossy paper, such as coated paper and glass cards, and have a strong sense of metallic ink.
Second, the printed gold, silver ink color, color saturation is not good 1. If the lining is sturdy or uneven, the printing pressure will inevitably be impractical. Then, between the ink and the paper on each dot of the printing plate in the printing process, it is impossible to maintain a comprehensive and comparative With proper contact conditions, the partial printing of the printing surface will inevitably occur. In addition, the lining has been used for a long time, because the paper surface foreign materials such as sand, paper crushed, pulp agglomerates, printing plates of different web sizes (press type) will make the lining produce a certain degree of uneven shape, which is also the imprinted hair The source of flowers, so the printing of gold and silver ink pad lining should use a neutral hard pad, the use of deformation of uneven padding should be replaced to improve the ink color quality.
2. If the rubber roller is too hard and the adhesiveness is insufficient, the colloid is broken, or the rubber roller is too hard, the adhesiveness is poor, and the ink is easily transferred unevenly. The lack of a good center of the rubber roller and the damage of the colloidal surface will inevitably lead to uneven ink transfer and the difference in thickness of the printing ink layer. Therefore, the printing roller of gold and silver ink should be soft and the colloid should be intact. With a more accurate center of the circle, the entire surface of the roller is evenly distributed. This is also an important condition for achieving a uniform and full ink color of the gold and silver inks.
3. The gold and silver inks are too thin, and the proportion of ink coloration, silver powder, and gold transfer oil caused by poor fluidity and viscosity is improper; that is, when the amount of gold transfer oil is too much, the mobility of gold and silver inks is too large. The stickiness is also bad, and the ink and cloth in the printing process will be thin, so the saturation of coloring is poor, and the print will appear to be a bit of a flower. Therefore, the thickness of gold and silver inks should be appropriate to ensure the quality of ink printing.
4. The underlay is not solid, the printing pressure is not uniform, and the gold and silver ink layers are distributed. The gold and silver inks are printed with the relief printing process. If the plywood is used as the printing plate base, the plywood is poor in solidity, the compression deformation coefficient is large, and the flatness is not Well, when printing gold and silver ink layouts, it is easy to produce printing pressure variation phenomenon, so that the printing pressure is uneven or insufficient, so that the printing ink layer is inevitably easy to generate flowers. Therefore, the printing of gold and silver ink layout should adopt a good flatness, hardness, solid strong metal tray, such as magnetic metal plate tray, aluminum tray, can better improve the printing ink quality. 5. Paper fiber gap, surface roughness, ink absorption, caused by gold, silver ink color printing ink product brightness and paper surface gloss have a great relationship, if the paper is rough, poor gloss, gold and silver Ink printing is quickly absorbed by the fibrous tissue of the paper. Then, the brightness of the printing ink layer is poor. If offset paper, letterpress paper, and white cardboard are used to print gold and silver ink, the color rendering effect is necessarily unsatisfactory. Therefore, in order to ensure the printing quality of gold and silver inks, it is better to print gold and silver inks with good paper glossiness, such as glass or coated paper, and the printing process is better.
Third, gold, silver version of the imprint roughening and paste the reasons 1. Improper adjustment of the ink ink flow, determines the ink transfer effect and print quality. If the gold and silver inks are too thin or too thick, the blots on the edge of the layout or the negative image may become thicker or appear ill-printed. So, to what extent is the consistency and viscosity of printed gold and silver inks appropriate? This is hard to say, nor can it be standardized with a uniform standard. Because of the different performance of printers and the different printing environment temperatures, there are differences in the printing ink concentration requirements. In general, the printer has many ink rollers, fast speeds, and high printing temperatures. The gold and silver inks are thickened appropriately so that the ink will be relatively thin after being exposed to heat, which is exactly in line with the printing requirements. If the ink is adjusted to the fluidity required for printing at once, the ink in the printing becomes too dilute after the printing, and the printing easily expands.
2. Too much ink When printing gold and silver ink, if the amount of ink is too large, the ink layer on each ink roller is too thick. After being applied to the printing plate, due to the excessive amount of ink in the graphic layout, then In the process, the excess ink is bound to be pushed to the edge of the layout, making the prints hairy. Therefore, the printing of gold and silver ink should control the appropriate amount of ink to ensure print quality.
3. Padded lining When the outer liner lining repeated pad or pad sticker, the trailing portion does not stick and flutter, and the lining is not tightened and packaged, the raised edge of the plate will appear after imprinting, so it should be a good lining process technology turn off.
4. Printing pressure is emphasized When the pad version is uneven, the bottom bracket is not square enough to make the layout bow or pad pressure is too heavy, it will also cause the printing of graphic arts paste, thick, this should be a good pad version of the process technology, India The version should be flat, solid, high and low pads.
4. The crystallization of the underlying ink layer does not allow gold and silver ink to adhere. When the undercoat ink layer is excessively dry and the background color ink is printed, if the amount of dry oil is too much, the ink layer on the print will dry too quickly. After the ink layer is conjunctated, a layer of crystallized film will be formed. , so that gold and silver ink overprint can not be attached. Therefore, the amount of dry oil should be moderate.
2. The thickness of the crystallization printing ink layer caused by the overprinting of the undercoat ink layer is thick, and the brightness of the ink layer of the printing product is high, and the visual effect is better. However, if the printing ink layer is too thick and the crystal surface is formed after the conjunctiva is formed, the gold and silver ink will be difficult to print. After printing, it is easy to pull off the ink layer. Therefore, the thickness of the undercoat ink layer should be controlled. Generally speaking, The overprinted ink layer should be printed thin enough, and even the dark ink of the background color can be adjusted darker to make the printing ink thinner. It can also meet the quality requirements.
3. Overprinting time interval is too long caused by the ink layer crystallization background printing after printing, if the placement of time is too long, the ink layer is too dry, it will make the gold and silver ink overprinting can not be attached, overprinting ink color, to prevent this type of When the situation occurs, the base ink can be overprinted after printing to a degree of 89%.
After the crystallization of the underlying color ink layer, remedial measures should be taken to ensure product quality. The cloth can be used to wipe the underlying ink layer and destroy the crystalline film to enhance the gold and silver ink adhesion ability. Second, add alkaline liquid or 389 resin oil processing industrial soap tablets in gold and silver ink. Thirdly, the pressure on the printing of gold and silver inks should be appropriately increased so that the gold and silver inks will adhere firmly to the background ink. (Kang Qilai)
1. The gold and silver inks are dull and lacking in metallic luster. The chemical properties of gold and silver powders in gold and silver inks are generally not stable enough. When acid, alkali, water vapor, sulfide gas and carbonic acid gas are encountered, they will produce A certain degree of chemical change makes the printing ink lack metallic luster. The metal's color change pattern changes from golden yellow to reddish brown, which in turn turns blackish. Because the red copper oxide can be generated when the copper is oxidized, it becomes black copper oxide after further oxidation. In addition, the gold powder is easily converted to copper carbonate under the conditions of relatively concentrated carbon dioxide gas and high humidity, and the gold ink on the printed product gradually becomes dark. After the discoloration of the silver ink, it was slightly grayish and lacked a silver metallic texture. In order to prevent the occurrence of the above-mentioned unfavorable conditions, gold powder and silver powder for gold and silver inks shall be prepared. During use and storage, heat, moisture and contact with acid-alkali substances shall be avoided. Unfinished gold and silver powders shall be sealed to ensure their quality. The stability is a condition. In addition, if the amount of gold and silver ink is too much, the use of time is too long, the speed of the printer is too fast, the number of branches using the rubber roller is too much, and the contact pressure between the ink rollers is too high, the ink is easily oxidized and blackened and darkened. The pH value of the paper is in a slightly acidic state. For example, offset paper, white paper, and paperboard generally have the characteristic of being acid-saturated. After the printing, the chemical reaction easily occurs and the gold and silver ink layers on the paper lose their metallic luster and brightness. In order to reduce or prevent the occurrence of printing defects, the gold and silver inks should be used with adjustments. Generally, it is appropriate to print three or four hours at a time. The speed of the printer is controlled at 2500 to 3,000 sheets per hour; two ink rollers are used. The glue should be softer, and the height should be aligned with the front and back (that is, in contact with the iron roller) so that the contact pressure is too heavy to aggravate the frictional heat and the black oxidation becomes dark. Gold and silver ink printing papers are preferably made of glossy paper, such as coated paper and glass cards, and have a strong sense of metallic ink.
Second, the printed gold, silver ink color, color saturation is not good 1. If the lining is sturdy or uneven, the printing pressure will inevitably be impractical. Then, between the ink and the paper on each dot of the printing plate in the printing process, it is impossible to maintain a comprehensive and comparative With proper contact conditions, the partial printing of the printing surface will inevitably occur. In addition, the lining has been used for a long time, because the paper surface foreign materials such as sand, paper crushed, pulp agglomerates, printing plates of different web sizes (press type) will make the lining produce a certain degree of uneven shape, which is also the imprinted hair The source of flowers, so the printing of gold and silver ink pad lining should use a neutral hard pad, the use of deformation of uneven padding should be replaced to improve the ink color quality.
2. If the rubber roller is too hard and the adhesiveness is insufficient, the colloid is broken, or the rubber roller is too hard, the adhesiveness is poor, and the ink is easily transferred unevenly. The lack of a good center of the rubber roller and the damage of the colloidal surface will inevitably lead to uneven ink transfer and the difference in thickness of the printing ink layer. Therefore, the printing roller of gold and silver ink should be soft and the colloid should be intact. With a more accurate center of the circle, the entire surface of the roller is evenly distributed. This is also an important condition for achieving a uniform and full ink color of the gold and silver inks.
3. The gold and silver inks are too thin, and the proportion of ink coloration, silver powder, and gold transfer oil caused by poor fluidity and viscosity is improper; that is, when the amount of gold transfer oil is too much, the mobility of gold and silver inks is too large. The stickiness is also bad, and the ink and cloth in the printing process will be thin, so the saturation of coloring is poor, and the print will appear to be a bit of a flower. Therefore, the thickness of gold and silver inks should be appropriate to ensure the quality of ink printing.
4. The underlay is not solid, the printing pressure is not uniform, and the gold and silver ink layers are distributed. The gold and silver inks are printed with the relief printing process. If the plywood is used as the printing plate base, the plywood is poor in solidity, the compression deformation coefficient is large, and the flatness is not Well, when printing gold and silver ink layouts, it is easy to produce printing pressure variation phenomenon, so that the printing pressure is uneven or insufficient, so that the printing ink layer is inevitably easy to generate flowers. Therefore, the printing of gold and silver ink layout should adopt a good flatness, hardness, solid strong metal tray, such as magnetic metal plate tray, aluminum tray, can better improve the printing ink quality. 5. Paper fiber gap, surface roughness, ink absorption, caused by gold, silver ink color printing ink product brightness and paper surface gloss have a great relationship, if the paper is rough, poor gloss, gold and silver Ink printing is quickly absorbed by the fibrous tissue of the paper. Then, the brightness of the printing ink layer is poor. If offset paper, letterpress paper, and white cardboard are used to print gold and silver ink, the color rendering effect is necessarily unsatisfactory. Therefore, in order to ensure the printing quality of gold and silver inks, it is better to print gold and silver inks with good paper glossiness, such as glass or coated paper, and the printing process is better.
Third, gold, silver version of the imprint roughening and paste the reasons 1. Improper adjustment of the ink ink flow, determines the ink transfer effect and print quality. If the gold and silver inks are too thin or too thick, the blots on the edge of the layout or the negative image may become thicker or appear ill-printed. So, to what extent is the consistency and viscosity of printed gold and silver inks appropriate? This is hard to say, nor can it be standardized with a uniform standard. Because of the different performance of printers and the different printing environment temperatures, there are differences in the printing ink concentration requirements. In general, the printer has many ink rollers, fast speeds, and high printing temperatures. The gold and silver inks are thickened appropriately so that the ink will be relatively thin after being exposed to heat, which is exactly in line with the printing requirements. If the ink is adjusted to the fluidity required for printing at once, the ink in the printing becomes too dilute after the printing, and the printing easily expands.
2. Too much ink When printing gold and silver ink, if the amount of ink is too large, the ink layer on each ink roller is too thick. After being applied to the printing plate, due to the excessive amount of ink in the graphic layout, then In the process, the excess ink is bound to be pushed to the edge of the layout, making the prints hairy. Therefore, the printing of gold and silver ink should control the appropriate amount of ink to ensure print quality.
3. Padded lining When the outer liner lining repeated pad or pad sticker, the trailing portion does not stick and flutter, and the lining is not tightened and packaged, the raised edge of the plate will appear after imprinting, so it should be a good lining process technology turn off.
4. Printing pressure is emphasized When the pad version is uneven, the bottom bracket is not square enough to make the layout bow or pad pressure is too heavy, it will also cause the printing of graphic arts paste, thick, this should be a good pad version of the process technology, India The version should be flat, solid, high and low pads.
4. The crystallization of the underlying ink layer does not allow gold and silver ink to adhere. When the undercoat ink layer is excessively dry and the background color ink is printed, if the amount of dry oil is too much, the ink layer on the print will dry too quickly. After the ink layer is conjunctated, a layer of crystallized film will be formed. , so that gold and silver ink overprint can not be attached. Therefore, the amount of dry oil should be moderate.
2. The thickness of the crystallization printing ink layer caused by the overprinting of the undercoat ink layer is thick, and the brightness of the ink layer of the printing product is high, and the visual effect is better. However, if the printing ink layer is too thick and the crystal surface is formed after the conjunctiva is formed, the gold and silver ink will be difficult to print. After printing, it is easy to pull off the ink layer. Therefore, the thickness of the undercoat ink layer should be controlled. Generally speaking, The overprinted ink layer should be printed thin enough, and even the dark ink of the background color can be adjusted darker to make the printing ink thinner. It can also meet the quality requirements.
3. Overprinting time interval is too long caused by the ink layer crystallization background printing after printing, if the placement of time is too long, the ink layer is too dry, it will make the gold and silver ink overprinting can not be attached, overprinting ink color, to prevent this type of When the situation occurs, the base ink can be overprinted after printing to a degree of 89%.
After the crystallization of the underlying color ink layer, remedial measures should be taken to ensure product quality. The cloth can be used to wipe the underlying ink layer and destroy the crystalline film to enhance the gold and silver ink adhesion ability. Second, add alkaline liquid or 389 resin oil processing industrial soap tablets in gold and silver ink. Thirdly, the pressure on the printing of gold and silver inks should be appropriately increased so that the gold and silver inks will adhere firmly to the background ink. (Kang Qilai)
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