This article talks about my experience in practical work on how to solve the problems in offset printing production.
One, the water roller seam, equipment, water transfer roller sewing, installation, adjustment is to achieve the key to ink and water balance, but also to ensure the quality of the key products, especially single-version water roller models (such as J4102, 03 machine ), The operation is not standardized, and the water supply is bad. Only the water fleece jacket can be replaced, resulting in loss. Therefore, when sewing water fleece sleeves, attention should be paid. First, put the water fleece tightly and tighten the end of the roll core upright. Draw water from the palm of the hand and rush from the top to the bottom so that the fleece sleeves will closely contact the core. Decrease the fleece springback, then tighten the lower end and cut off the excess. After the seam is finished, the water roller is placed in water and soaked evenly, and a laundry brush is used to wipe off the flannel with water. The water absorption of the fleece jacket is even, which can prevent the ink particles suspended in the water tank from contacting the flannel first and then oleophilic and reduce the water transport function of the fleece jacket. At the same time, the fluff can be removed and the fluff can be reduced to the ink. Ink transmission, resulting in flower version, heap ink. After attaching the water roller, the key is pressure adjustment. When commissioning the water roller and printing plate pressure, it is necessary to protect the printing plate from damage. Turn the plate cylinder to the printing plate and drag it with no graphics. Use 0.1MM. The steel sheet is to be debugged. There must be a certain degree of force in the steel plate insert roller, but it should not be too tight. The width of the water roller indentation should be 6-8mm. If it is too heavy, it will reverse the ink and reduce the ink volume of the plate; if it is too light, the water supply will be insufficient and the paste will become dirty. Adjust the pressure of the water roller and the string water roller to be slightly lighter than the plate pressure so that the water passes through. Too tight, there is water on the water roller, and there is no water or water on the plate, the water film on the plate is not uniform, and the plate is dry and dirty. If the ink volume is blindly reduced to balance the ink, the product is too thin and not saturated. , imprinted hair is weak. The 0.2MM steel sheet was used to debug the pressure of the water transfer roller, the string water roller, and the water fountain roller, and the elasticity of both sides was basically the same.
Second, the fountain solution with the distribution, testing, and determination of the operator in the fountain solution preparation, PH value testing, the amount of stability is also not be ignored. PH value is too low, the text and ink force drop, can not achieve the ideal transfer rate, the product appears flower version, if you reduce the amount of water, the layout is dry and dirty, it is easy to interfere with the judgment of the fault. The proportion of the fountain solution due to improper configuration, artificially increase the proportion of powder will make the fountain solution acidic, but also damage the ink pigment molecular structure, causing discoloration of printed products; PH value is too high, the dampening solution is alkaline, indicating that the wet The proportion of powder is relatively small, can not protect the hydrophilic part, easy to dirty, can also cause heaping ink, the operator blindly increase the amount of water, although the layout immediately see the bright water film, poor control is also easy to make imbalance, so that the product ink Hair deficiency, gloss is reduced, the graphic is not saturated enough. At present, most factories use “Lide-brand†wetting powder, which is manufactured according to a fixed proportion of the manufacturer. Wet powder can also be prepared according to the ratio of 1:200 (water). The pH value should generally be controlled between 4.5-6.5. It is weakly acidic and can basically meet production needs.
Third, the installation, use, protection of the blanket When installing the blanket, first determine the direction of the blanket, so that the direction of the blanket stretch better consistent with the printing and the rubber should be square, the distance between the hole and the edge of the blanket Parallel, straight-line hole position, the middle and back ends should be firstly clamped with a rubber clamp, and each screw should be tightened to avoid unevenness after the extension, ghosting, uneven dark ink, and overprinting. Quasi-etc.
When the blanket is loaded on the machine, the tension on both sides should be even and uniform, and the paper should be wrapped outside the drum in a smooth manner. Otherwise, the ink product on one side of the Swiss product will be empty and the front end will be dark, and the mouth will be filled with ink, ink bars and graphic images. Such as failure. Tensile force can not be too tight, otherwise the rubber elasticity decreases, reducing the life; too loose will be ghosting. When installing, you can use your fingertips to click on the rubber beside the tensioning shaft. There is a certain rebound force.
During the use of the blanket, strong light should be avoided for a long period of time. Timing rub the rubber with pumice powder, so that the rubber to maintain good performance, but also should regularly remove the debris between the tensioning gear teeth, so as not to loosen the rubber when used. In a few days, when it is not switched on, the rubber is peeled off at home and covered with ink paper to prevent aging of the rubber. The periphery of the rubber is always kept clean to prevent corrosion and aging of the rubber. After the sticky adhesive, the paper is torn, affecting the normal service life of the rubber and increasing the production cost.
In short, the details of the offset printing work, if it is not seriously taken care of, will bring about the trouble of the party committee of the Communist Youth League. Therefore, the above problems cannot be ignored in the specific operations. (Printing Factory Yu Zehe, Guangxi Normal University) ("Packaging Printing")
One, the water roller seam, equipment, water transfer roller sewing, installation, adjustment is to achieve the key to ink and water balance, but also to ensure the quality of the key products, especially single-version water roller models (such as J4102, 03 machine ), The operation is not standardized, and the water supply is bad. Only the water fleece jacket can be replaced, resulting in loss. Therefore, when sewing water fleece sleeves, attention should be paid. First, put the water fleece tightly and tighten the end of the roll core upright. Draw water from the palm of the hand and rush from the top to the bottom so that the fleece sleeves will closely contact the core. Decrease the fleece springback, then tighten the lower end and cut off the excess. After the seam is finished, the water roller is placed in water and soaked evenly, and a laundry brush is used to wipe off the flannel with water. The water absorption of the fleece jacket is even, which can prevent the ink particles suspended in the water tank from contacting the flannel first and then oleophilic and reduce the water transport function of the fleece jacket. At the same time, the fluff can be removed and the fluff can be reduced to the ink. Ink transmission, resulting in flower version, heap ink. After attaching the water roller, the key is pressure adjustment. When commissioning the water roller and printing plate pressure, it is necessary to protect the printing plate from damage. Turn the plate cylinder to the printing plate and drag it with no graphics. Use 0.1MM. The steel sheet is to be debugged. There must be a certain degree of force in the steel plate insert roller, but it should not be too tight. The width of the water roller indentation should be 6-8mm. If it is too heavy, it will reverse the ink and reduce the ink volume of the plate; if it is too light, the water supply will be insufficient and the paste will become dirty. Adjust the pressure of the water roller and the string water roller to be slightly lighter than the plate pressure so that the water passes through. Too tight, there is water on the water roller, and there is no water or water on the plate, the water film on the plate is not uniform, and the plate is dry and dirty. If the ink volume is blindly reduced to balance the ink, the product is too thin and not saturated. , imprinted hair is weak. The 0.2MM steel sheet was used to debug the pressure of the water transfer roller, the string water roller, and the water fountain roller, and the elasticity of both sides was basically the same.
Second, the fountain solution with the distribution, testing, and determination of the operator in the fountain solution preparation, PH value testing, the amount of stability is also not be ignored. PH value is too low, the text and ink force drop, can not achieve the ideal transfer rate, the product appears flower version, if you reduce the amount of water, the layout is dry and dirty, it is easy to interfere with the judgment of the fault. The proportion of the fountain solution due to improper configuration, artificially increase the proportion of powder will make the fountain solution acidic, but also damage the ink pigment molecular structure, causing discoloration of printed products; PH value is too high, the dampening solution is alkaline, indicating that the wet The proportion of powder is relatively small, can not protect the hydrophilic part, easy to dirty, can also cause heaping ink, the operator blindly increase the amount of water, although the layout immediately see the bright water film, poor control is also easy to make imbalance, so that the product ink Hair deficiency, gloss is reduced, the graphic is not saturated enough. At present, most factories use “Lide-brand†wetting powder, which is manufactured according to a fixed proportion of the manufacturer. Wet powder can also be prepared according to the ratio of 1:200 (water). The pH value should generally be controlled between 4.5-6.5. It is weakly acidic and can basically meet production needs.
Third, the installation, use, protection of the blanket When installing the blanket, first determine the direction of the blanket, so that the direction of the blanket stretch better consistent with the printing and the rubber should be square, the distance between the hole and the edge of the blanket Parallel, straight-line hole position, the middle and back ends should be firstly clamped with a rubber clamp, and each screw should be tightened to avoid unevenness after the extension, ghosting, uneven dark ink, and overprinting. Quasi-etc.
When the blanket is loaded on the machine, the tension on both sides should be even and uniform, and the paper should be wrapped outside the drum in a smooth manner. Otherwise, the ink product on one side of the Swiss product will be empty and the front end will be dark, and the mouth will be filled with ink, ink bars and graphic images. Such as failure. Tensile force can not be too tight, otherwise the rubber elasticity decreases, reducing the life; too loose will be ghosting. When installing, you can use your fingertips to click on the rubber beside the tensioning shaft. There is a certain rebound force.
During the use of the blanket, strong light should be avoided for a long period of time. Timing rub the rubber with pumice powder, so that the rubber to maintain good performance, but also should regularly remove the debris between the tensioning gear teeth, so as not to loosen the rubber when used. In a few days, when it is not switched on, the rubber is peeled off at home and covered with ink paper to prevent aging of the rubber. The periphery of the rubber is always kept clean to prevent corrosion and aging of the rubber. After the sticky adhesive, the paper is torn, affecting the normal service life of the rubber and increasing the production cost.
In short, the details of the offset printing work, if it is not seriously taken care of, will bring about the trouble of the party committee of the Communist Youth League. Therefore, the above problems cannot be ignored in the specific operations. (Printing Factory Yu Zehe, Guangxi Normal University) ("Packaging Printing")
Mobile Whiteboard,Mobile Whiteboard With Stand,Mobile Rolling Whiteboard,Large Mobile Whiteboard
Jiangyin Europtronic Stationery Co., Ltd. , https://www.youpuwhiteboard.com