The method of adjustment is: in the absence of instrument and gauge measurement, according to the standard liner parameters specified by each machine, minus 0.15mm (ie, two sheets of 80g/m2 paper thickness) equipped with a rubber roller, with the same paper cut Two 40mm wide strips of paper are placed at about 10-15cm from the end of the blanket cylinder at both ends, and then the table is pressed. Pull a piece of paper hard, but you can't break it. After the tension on both ends of the paper is reached, remove the rubber and add 0.15mm thick paper. The pressure of the blanket cylinder and the impression cylinder can be solved by the above method of drawing the paper strip.
The conclusion is that the pressure of the impression cylinder and the blanket cylinder is greater than the pressure of the plate cylinder and the blanket cylinder (ie, one sheet of printing paper). The purpose is to allow the skinned ink to transfer to the product more effectively.
Third, the ink roller is not parallel caused by the printing failure analysis: the ink roller is not parallel to each other, overweight or too light can cause printing failure, but the plate roller pressure caused by the size of the more errors.
The ink rollers are not parallel to each other, and the contact surface is definitely inconsistent, so the ink transfer is not normal and uneven.
The four versions are not too heavy or too light, and they are too light for printing plates. The ink on the plate base is not strong, and the water is slightly larger to print quickly. Such as increasing the amount of ink on the ink plate floating, reduce the amount of water will paste version, the general situation will appear large water and ink, and ultimately lead to ink and water imbalance.
Reliance on the version of the roller is too heavy, which affects the life of the printing plate and it is easy to lift the strip of ink. The regenerated version will also be broken by dragging or squeezing, and there will also be ink on the edges of the prints or on the trailing edges. The most serious problem is that the plate is bar-shaped, the fountain solution is weakly acidic, and the fountain solution is strongly acidic.
Exclusion method: Be sure to do the pressure balance between the ink roller, contact surface of about 2 ~ 3mm is appropriate, if the ink roller is olive-shaped best not to use, because it can not balance. Version of the roller bar width: new rubber roller 5 ~ 6mm is appropriate, the old plastic stick 4 ~ 5mm is appropriate. Because most of the old rubber rollers are aging, the elasticity is weak and the pressure is not large. Avoid plates from bars. Another version of the collector roller must be slightly lighter than the platen roller, so that the amount of ink on the plate is substantial.
Fourth, the water roller is not parallel to the printing failure caused by printing ink balance is the key to improving product quality. If the water rollers are not parallel or if one of the water rollers is not adjusted properly, the ink balance will be affected.
Relying on the edition plate of the water roll is too heavy, it will reverse the string ink, reduce the ink on the printing plate. Relying on the version of the water roller is too light, there is not enough water in the printing plate, the water is small in ink, and the blank space is easy to get dirty. The version of the water roller is too tight against the string of water copper rollers, water is on the water roller and there is no water or water on the plate, and the plate is dirty.
By relying on the version of the water roller, the water copper roller is too light, the water cannot be transported to the printing plate, and the printing plate is dried and dirty. If the amount of ink is reduced, the product ink will not reach saturation.
It is also reasonable for the small water roller to be tight on both sides of the copper roller, which directly affects the water supply to the big water roller.
Excluded methods: Sheung Shui plastic cover, we must strive to tighten the package. After wrapping, it is best to use a piece of paper in order to achieve uniform and consistent up and down.
The method for testing the roll tightness of the water roll is to draw the printing plate against the water roller and repeatedly insert the 0.2 mm thick steel plate at different positions on the plate. Steel inserts must have a certain degree of strength, but not too tight. The water roll is about 6-8mm. Relies on the version of the water roller to rely on the string of water to be slightly loose on the version, so you can reduce or avoid the ink on the version of the water roller, down to the string of water copper roller and small water roller.
The tension of the small water roller against the copper roller of the water bucket can be tested with a 80 g/m2 kraft paper strip. When the small water roller is on the copper roller of the water bucket, the kraft paper strip is pulled upwards, so as to be both strong and continuous. It is best to stop the test with 0.2mm thick steel sheet, and the elasticity of the small water roller on both sides of the copper roller can be basically the same.
V. The pH value of the water bucket solution caused by the instability of the pH value of the water bucket solution is too low to counter the attack of the ink on the blank space of the layout. The blank space is easy to get dirty, and it is easy to paste. Increase the amount of water, the version of the water film is too large and weakened ink, the product ink is not full, dull. The physical version has a small blistering appearance and feels unfair.
The pH value of the hopper solution is too high, the layout is refreshing, but it is easy to print, such as reducing the amount of water, the layout will be dirty and dry. This led to both a dirty and a dirty version, shortening the life of the plate.
Suddenly, the water fountain solution caused the layout water film to become smaller and smaller, and the ink was not balanced. PS2101 offset printing......
Excluded measures: Conditional units can use the instrument to measure the pH, and it is advisable to control it between 3.6 and 4.5. If there is no instrument detection, according to the author's experience, the water bucket solution (wetting powder) can be used in the following ratio: 1:200 (water). But this is not an absolute standard ratio. The specific situation should be treated specifically, so that reasonable preparation. To achieve this, we must look at three: a look at the layout of the water film size, two to see whether the product is full of ink and layout clean, three to see whether the product is not flat paper roll angle. General new version on the machine, version of the sand on the lossless, can not see the water film, the layout was grayish brown, no light, hand touch the blank area with a moist feeling, the layout is clean and dirty, pH value of the water bucket solution is reasonable. After it was printed on 20,000 pages, the screen surface appeared bright and water film appeared, but it was not dirty. The ink was full and even and normal. The paper was not curled and the pH of the water bucket solution was a reasonable value. On the contrary, the layout of the water film is large, paste version, after the shutdown treatment and re-appeared paste, which is the pH value is too small, to increase the solution dose. If the water film is not visible on the layout, the ink color of the product will be gradually reduced from the original saturated state or the pattern will appear. This proves that the pH value of the water bucket solution is too high and must be diluted with clear water. In addition, the water fountain solution must maintain a certain amount, uniform water supply, ink and water can maintain balance.
The conclusion is that the pressure of the impression cylinder and the blanket cylinder is greater than the pressure of the plate cylinder and the blanket cylinder (ie, one sheet of printing paper). The purpose is to allow the skinned ink to transfer to the product more effectively.
Third, the ink roller is not parallel caused by the printing failure analysis: the ink roller is not parallel to each other, overweight or too light can cause printing failure, but the plate roller pressure caused by the size of the more errors.
The ink rollers are not parallel to each other, and the contact surface is definitely inconsistent, so the ink transfer is not normal and uneven.
The four versions are not too heavy or too light, and they are too light for printing plates. The ink on the plate base is not strong, and the water is slightly larger to print quickly. Such as increasing the amount of ink on the ink plate floating, reduce the amount of water will paste version, the general situation will appear large water and ink, and ultimately lead to ink and water imbalance.
Reliance on the version of the roller is too heavy, which affects the life of the printing plate and it is easy to lift the strip of ink. The regenerated version will also be broken by dragging or squeezing, and there will also be ink on the edges of the prints or on the trailing edges. The most serious problem is that the plate is bar-shaped, the fountain solution is weakly acidic, and the fountain solution is strongly acidic.
Exclusion method: Be sure to do the pressure balance between the ink roller, contact surface of about 2 ~ 3mm is appropriate, if the ink roller is olive-shaped best not to use, because it can not balance. Version of the roller bar width: new rubber roller 5 ~ 6mm is appropriate, the old plastic stick 4 ~ 5mm is appropriate. Because most of the old rubber rollers are aging, the elasticity is weak and the pressure is not large. Avoid plates from bars. Another version of the collector roller must be slightly lighter than the platen roller, so that the amount of ink on the plate is substantial.
Fourth, the water roller is not parallel to the printing failure caused by printing ink balance is the key to improving product quality. If the water rollers are not parallel or if one of the water rollers is not adjusted properly, the ink balance will be affected.
Relying on the edition plate of the water roll is too heavy, it will reverse the string ink, reduce the ink on the printing plate. Relying on the version of the water roller is too light, there is not enough water in the printing plate, the water is small in ink, and the blank space is easy to get dirty. The version of the water roller is too tight against the string of water copper rollers, water is on the water roller and there is no water or water on the plate, and the plate is dirty.
By relying on the version of the water roller, the water copper roller is too light, the water cannot be transported to the printing plate, and the printing plate is dried and dirty. If the amount of ink is reduced, the product ink will not reach saturation.
It is also reasonable for the small water roller to be tight on both sides of the copper roller, which directly affects the water supply to the big water roller.
Excluded methods: Sheung Shui plastic cover, we must strive to tighten the package. After wrapping, it is best to use a piece of paper in order to achieve uniform and consistent up and down.
The method for testing the roll tightness of the water roll is to draw the printing plate against the water roller and repeatedly insert the 0.2 mm thick steel plate at different positions on the plate. Steel inserts must have a certain degree of strength, but not too tight. The water roll is about 6-8mm. Relies on the version of the water roller to rely on the string of water to be slightly loose on the version, so you can reduce or avoid the ink on the version of the water roller, down to the string of water copper roller and small water roller.
The tension of the small water roller against the copper roller of the water bucket can be tested with a 80 g/m2 kraft paper strip. When the small water roller is on the copper roller of the water bucket, the kraft paper strip is pulled upwards, so as to be both strong and continuous. It is best to stop the test with 0.2mm thick steel sheet, and the elasticity of the small water roller on both sides of the copper roller can be basically the same.
V. The pH value of the water bucket solution caused by the instability of the pH value of the water bucket solution is too low to counter the attack of the ink on the blank space of the layout. The blank space is easy to get dirty, and it is easy to paste. Increase the amount of water, the version of the water film is too large and weakened ink, the product ink is not full, dull. The physical version has a small blistering appearance and feels unfair.
The pH value of the hopper solution is too high, the layout is refreshing, but it is easy to print, such as reducing the amount of water, the layout will be dirty and dry. This led to both a dirty and a dirty version, shortening the life of the plate.
Suddenly, the water fountain solution caused the layout water film to become smaller and smaller, and the ink was not balanced. PS2101 offset printing......
Excluded measures: Conditional units can use the instrument to measure the pH, and it is advisable to control it between 3.6 and 4.5. If there is no instrument detection, according to the author's experience, the water bucket solution (wetting powder) can be used in the following ratio: 1:200 (water). But this is not an absolute standard ratio. The specific situation should be treated specifically, so that reasonable preparation. To achieve this, we must look at three: a look at the layout of the water film size, two to see whether the product is full of ink and layout clean, three to see whether the product is not flat paper roll angle. General new version on the machine, version of the sand on the lossless, can not see the water film, the layout was grayish brown, no light, hand touch the blank area with a moist feeling, the layout is clean and dirty, pH value of the water bucket solution is reasonable. After it was printed on 20,000 pages, the screen surface appeared bright and water film appeared, but it was not dirty. The ink was full and even and normal. The paper was not curled and the pH of the water bucket solution was a reasonable value. On the contrary, the layout of the water film is large, paste version, after the shutdown treatment and re-appeared paste, which is the pH value is too small, to increase the solution dose. If the water film is not visible on the layout, the ink color of the product will be gradually reduced from the original saturated state or the pattern will appear. This proves that the pH value of the water bucket solution is too high and must be diluted with clear water. In addition, the water fountain solution must maintain a certain amount, uniform water supply, ink and water can maintain balance.
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