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According to the principle of offset printing, the graphic part of the PS plate is oleophilic and the non-graphic part is hydrophilic. In order to obtain good printing quality, we must ensure that the graphic part is not hydrophilic, non-graphic part does not appear fat and lipophilic to produce oily phenomenon. To achieve the above mentioned purpose, it is necessary to use an acid and a salt to formulate a fountain solution. The acidic substance in the fountain solution chemically reacts with the aluminum plate to form a hydrophilic salt layer on the surface of the plate. It has a good Hydrophobic and oil-repelling ability to ensure the cleanness of non-graphical parts, resulting in oiliness on the PS plate because the inorganic salt layer of the non-graphical part of the plate is damaged, or the hydrophilic colloid produced by the fountain solution itself. The slower generation makes it impossible for the non-graphic part to replenish the inorganic salt layer in time, resulting in the non-graphical part of the phenomenon of fat and lipophilicity. According to the past experience in printing practice, the reasons why the non-graphical parts of the PS version are greasy are roughly the following.
1. The fountain solution is too acidic or too weak. The acidity is too weak, the hydrophilic salt layer is formed slowly, and the degreasing ability is poor; the acidity is too strong, and the plate material is heavily corroded, so that the plate surface shines brightly; the plate-off occurs and the emulsification of the ink is aggravated, and the life of the PS plate is affected. To control the pH of the fountain solution, pH test paper can be used for testing. Under normal circumstances, the magenta ink is 4, the yellow ink is 5, the green and black are about 5, and the overall control is 4-6. When the ink is printed in the field and the ink layer is thick, the pH of the fountain solution is smaller. On the contrary, when the screen printing ink layer is thinner, the pH of the fountain solution should be larger.
2. Improper adjustment of the water roller pressure. When the pressure of the water roller and the water roller is too heavy, there are two cases. First, the water fleece on the water roller is squeezed and loses its elasticity. Second, the water roller is rotating. When the front part of the contact between the water roller and the string water roller is squeezed, the plate surface does not actually have a proper water distribution and produces a sense of fat. Therefore, when correcting the pressure between the water roller and the string water roller, Should not be too tight, with 0.8mm steel can be inserted and can be gently pulled out even if properly adjusted. Can also be used to press watermark watermark to test, after the water roller on the foot after the water, press the watermark on the plate surface, the width of the watermark should be about 5mm, the two with the middle of the pressure to be consistent.
3, ink roller aging and improper adjustment. Good quality ink roller should have good elasticity, oil resistance, heat resistance and acid and alkali resistance in order to guarantee the quality of the printed matter. At present, most of the printing companies use synthetic rubber rollers. When the synthetic resin and acid of the ink are immersed, the surface will hardly glow, affecting the elasticity and the ink transfer performance. The ink on the hard ink roller will be easily generated. Ink emulsification, the viscosity of the ink after emulsification decreases, the necessary adhesion between the molecules is lacking, and when the ink roller rolls on the surface of the printing plate, the ink lacking the adhesion easily enters into the sand of the printing plate, gradually making the hydrophilic inorganic material. The salt layer produces oily and oleophobic and there is a greasy phenomenon in the layout. The processing methods are generally the following: 1 Grinding the ink roller, the ink roller after grinding has a large amount of ink, good ink transfer and ink collection, full dots and clear layers. Non-graphical parts can be kept clean, can effectively prevent the greasy production; 2 often keep the ink roller clean; 3 if the pressure regulation of the ink roller with the ink roller layout is bad, in the adjustment, we must keep the ink roller at both ends The pressure is basically the same, which is a key factor in preventing greasy production.
4. The pressure between the plate cylinder and the blanket cylinder is too high. Under ideal pressure conditions, the pressure between the print and blanket cylinders is approximately 0.1 mm, but most machines do not meet this requirement and are above the ideal pressure. At the same time, due to the paper structure, the surface roughness is inconsistent and the thickness is thin For unequal reasons, in order to maintain strong outlets and normal transmission of dot blots, during the operation process, liners are often placed under blankets. Sometimes, due to the large size of the printed artwork, the size of the mouthpieces left is small, and the occurrence of bite-ins It is possible that the pressure between the blanket cylinder and the printing plate cylinder will increase and the hydrophilic layer on the surface of the PS plate will be damaged and become oily and oleophilic. In this case, the plate cylinder and the plate cylinder must be correctly mastered. Pressure between rubber blankets. The rough paper should be solved by adjusting the center distance between the blanket cylinder and the plate cylinder. If the gap is not uniform, the rubber cylinder should be borrowed as far as possible from the mouth, but care must be taken if the blanket on the seam And the liner is pressed down. If the above measures are still not printed, then a new blanket and liner should be replaced, or the transfer blanket should be used to solve the problem.
5, the ink is too thin or oily too much; sometimes in the process of operation, encountered the surface structure of the paper is not tight, and the rubber roller peeling easily when the hair off, powder and other issues. In order to eliminate such failures, during the operation process, too much ink is often added to the ink and the spreading agent, thereby destroying the transfer conditions of the ink layer, greatly reducing the viscosity of the ink, increasing the oiliness, and reducing the ink. The roller's ink-adsorption performance causes the remaining ink layer of the PS plate to be insufficient, and the graphic part is dirty due to the exposed thick wear. Therefore, the ink that is too thin for the ink can be renewed, or an appropriate amount of concentrated ink can be added to increase its viscosity. At the same time, the acidity of the fountain solution must be increased, and the arabic resin glue can be added. The old PS plate can be used to wipe the potion. Greasy, wipe clean with a clean cloth rubbed with copper sulfate, copper sulfate and PS version of the chemical reaction to produce a new hydrophilic layer, to prevent greasy produce a certain role.
In summary, the reasons for the greasy PS layout are nothing more than the above, how to reduce the production of greasy, the following talk about a few experiences.
1. Ideas should pay attention to product quality, and at the same time do a good job of maintaining and maintaining the machine. If problems are found and problems are solved in time, only the normal operation of the machine can be ensured. Only in this way can it be of high quality, high efficiency, and low loss.
2, to strengthen the PS version of the protection, the appropriate adjustment of the pressure of the water roller and PS version, to minimize axial turbulence. When they are not in contact with the PS plate, their circumferential rotation is flexible and flexible. At the same time, appropriate liners should be selected according to the actual situation. During printing, frequent shifts are avoided, the surface line speed of the embossing area is required to be uniform, and the PS plate is prevented from generating friction, making the dots The foundation was destroyed. When the summer shutdown is more than 3 minutes and the winter shutdown is more than 5 minutes, the PS plate should be wiped with protective rubber for protection.
3, the use of stable performance, quality of the PS version; while improving the printing process, in the printing process should be comprehensive consideration of the developer temperature concentration, pH value carefully adjusted, careful operation.
4. Control the acidity, alkalinity, and ink balance of the fountain solution. Always look at the water and master the pH of the fountain solution.
5, ink preparation and recording, as little as possible with adjuvants, and make the original record.
(Text / Liu Tiefu)
1. The fountain solution is too acidic or too weak. The acidity is too weak, the hydrophilic salt layer is formed slowly, and the degreasing ability is poor; the acidity is too strong, and the plate material is heavily corroded, so that the plate surface shines brightly; the plate-off occurs and the emulsification of the ink is aggravated, and the life of the PS plate is affected. To control the pH of the fountain solution, pH test paper can be used for testing. Under normal circumstances, the magenta ink is 4, the yellow ink is 5, the green and black are about 5, and the overall control is 4-6. When the ink is printed in the field and the ink layer is thick, the pH of the fountain solution is smaller. On the contrary, when the screen printing ink layer is thinner, the pH of the fountain solution should be larger.
2. Improper adjustment of the water roller pressure. When the pressure of the water roller and the water roller is too heavy, there are two cases. First, the water fleece on the water roller is squeezed and loses its elasticity. Second, the water roller is rotating. When the front part of the contact between the water roller and the string water roller is squeezed, the plate surface does not actually have a proper water distribution and produces a sense of fat. Therefore, when correcting the pressure between the water roller and the string water roller, Should not be too tight, with 0.8mm steel can be inserted and can be gently pulled out even if properly adjusted. Can also be used to press watermark watermark to test, after the water roller on the foot after the water, press the watermark on the plate surface, the width of the watermark should be about 5mm, the two with the middle of the pressure to be consistent.
3, ink roller aging and improper adjustment. Good quality ink roller should have good elasticity, oil resistance, heat resistance and acid and alkali resistance in order to guarantee the quality of the printed matter. At present, most of the printing companies use synthetic rubber rollers. When the synthetic resin and acid of the ink are immersed, the surface will hardly glow, affecting the elasticity and the ink transfer performance. The ink on the hard ink roller will be easily generated. Ink emulsification, the viscosity of the ink after emulsification decreases, the necessary adhesion between the molecules is lacking, and when the ink roller rolls on the surface of the printing plate, the ink lacking the adhesion easily enters into the sand of the printing plate, gradually making the hydrophilic inorganic material. The salt layer produces oily and oleophobic and there is a greasy phenomenon in the layout. The processing methods are generally the following: 1 Grinding the ink roller, the ink roller after grinding has a large amount of ink, good ink transfer and ink collection, full dots and clear layers. Non-graphical parts can be kept clean, can effectively prevent the greasy production; 2 often keep the ink roller clean; 3 if the pressure regulation of the ink roller with the ink roller layout is bad, in the adjustment, we must keep the ink roller at both ends The pressure is basically the same, which is a key factor in preventing greasy production.
4. The pressure between the plate cylinder and the blanket cylinder is too high. Under ideal pressure conditions, the pressure between the print and blanket cylinders is approximately 0.1 mm, but most machines do not meet this requirement and are above the ideal pressure. At the same time, due to the paper structure, the surface roughness is inconsistent and the thickness is thin For unequal reasons, in order to maintain strong outlets and normal transmission of dot blots, during the operation process, liners are often placed under blankets. Sometimes, due to the large size of the printed artwork, the size of the mouthpieces left is small, and the occurrence of bite-ins It is possible that the pressure between the blanket cylinder and the printing plate cylinder will increase and the hydrophilic layer on the surface of the PS plate will be damaged and become oily and oleophilic. In this case, the plate cylinder and the plate cylinder must be correctly mastered. Pressure between rubber blankets. The rough paper should be solved by adjusting the center distance between the blanket cylinder and the plate cylinder. If the gap is not uniform, the rubber cylinder should be borrowed as far as possible from the mouth, but care must be taken if the blanket on the seam And the liner is pressed down. If the above measures are still not printed, then a new blanket and liner should be replaced, or the transfer blanket should be used to solve the problem.
5, the ink is too thin or oily too much; sometimes in the process of operation, encountered the surface structure of the paper is not tight, and the rubber roller peeling easily when the hair off, powder and other issues. In order to eliminate such failures, during the operation process, too much ink is often added to the ink and the spreading agent, thereby destroying the transfer conditions of the ink layer, greatly reducing the viscosity of the ink, increasing the oiliness, and reducing the ink. The roller's ink-adsorption performance causes the remaining ink layer of the PS plate to be insufficient, and the graphic part is dirty due to the exposed thick wear. Therefore, the ink that is too thin for the ink can be renewed, or an appropriate amount of concentrated ink can be added to increase its viscosity. At the same time, the acidity of the fountain solution must be increased, and the arabic resin glue can be added. The old PS plate can be used to wipe the potion. Greasy, wipe clean with a clean cloth rubbed with copper sulfate, copper sulfate and PS version of the chemical reaction to produce a new hydrophilic layer, to prevent greasy produce a certain role.
In summary, the reasons for the greasy PS layout are nothing more than the above, how to reduce the production of greasy, the following talk about a few experiences.
1. Ideas should pay attention to product quality, and at the same time do a good job of maintaining and maintaining the machine. If problems are found and problems are solved in time, only the normal operation of the machine can be ensured. Only in this way can it be of high quality, high efficiency, and low loss.
2, to strengthen the PS version of the protection, the appropriate adjustment of the pressure of the water roller and PS version, to minimize axial turbulence. When they are not in contact with the PS plate, their circumferential rotation is flexible and flexible. At the same time, appropriate liners should be selected according to the actual situation. During printing, frequent shifts are avoided, the surface line speed of the embossing area is required to be uniform, and the PS plate is prevented from generating friction, making the dots The foundation was destroyed. When the summer shutdown is more than 3 minutes and the winter shutdown is more than 5 minutes, the PS plate should be wiped with protective rubber for protection.
3, the use of stable performance, quality of the PS version; while improving the printing process, in the printing process should be comprehensive consideration of the developer temperature concentration, pH value carefully adjusted, careful operation.
4. Control the acidity, alkalinity, and ink balance of the fountain solution. Always look at the water and master the pH of the fountain solution.
5, ink preparation and recording, as little as possible with adjuvants, and make the original record.
(Text / Liu Tiefu)
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