(1) Preparation of a new job for the printing press to be ready for printing Before the commissioning work begins, the printing machine must first be ready to print the next job, and the printing of the previous job should be withdrawn from the delivery section to take the previous job. Remove the plate from the unit and store it separately; replace the damaged blanket. If the color of the ink changes, the ink supply system also needs to be cleaned, and the wetting system may also need to be cleaned.
1, cleaning the ink system. The first step in cleaning the ink system is to remove the remaining ink in the ink tank first. The operator can use the ink shovel to carefully remove the remaining ink in the ink tank and throw the excess ink back into the ink tank if the ink is already in the ink. If you leave it in the tank for a few hours, it should be drained. Note: When removing the ink remaining in the ink tank, use a plastic spatula instead of a metal spatula.
The quickest way to remove the ink from the ink roller is to use a cleaning device that includes an adjustable doctor blade and an ink tray (or ink receiver) that is used with specialized solvents. Carefully read the manufacturer's instructions and follow the cleaning and safety guidelines to ensure that the best cleaning results are obtained when using the cleaning device.
Daily cleaning usually involves two-step cleaning. First use a water-soluble solvent to remove dirt, glue, and alcohol substitutes; then use a second solvent to rinse off the first solvent so that there is no solvent on the roller. Residues. Special attention should be paid to the two ends of the roll. During the printing process, the ink is often deposited and agglomerated. Note: Do not wipe the ends of the roller or any part of the ink supply system by hand during operation of the printer. If it is thoroughly cleaned, even if the black ink is replaced with yellow, there will be no black ink remaining problem. Roller manufacturers also recommend this two-step cleaning method to users. Each chemical reagent has a Material Safety Data Sheet (MSDS) provided by the manufacturer. The MSDS provides information on the use, processing and storage of chemical reagents. Details.
Although the cleaning solvents used in practice vary, their efficacy is exactly the same. Each cleaning solution wets the dried ink and causes the pigment particles to dissolve and diffuse. Afterwards, the pigment particles are transferred along the roller to the cleaning device and gradually cleaned; then, the dried glue is rinsed off with water. Between these two steps (or at each step), the solvent in the ink system should be flushed, leaving no residue.
The two solvents in the cleaning solution must be used in the correct order and must not be easily replaced by other solvents.
The printer operator can remove the ink by simply disposing a cleaning device on the printer. After use, the blade and the ink tray of the device must be thoroughly cleaned. The cleaning device cleans the rollers thoroughly, but the operator of the press must know that the rollers are “clean†but are different from “true cleanâ€. The basic steps for using an attached cleaning device are as follows:
a, gluing and drying the Printing Plate to avoid inadvertently dropping ink or cleaning droplets onto the printing plate;
b, start the printing press, and run at medium speed, if it is a new machine, the speed can usually be set between 6000 inches / hour ~ 7000 inches / hour;
c. Rinse the roller away from the cleaning blade with solvent to fully wet the roller and soften the drying ink thereon;
d, let the printing press idle for two minutes, then make the cleaning blade close to the ink roller, and gradually increase the printing pressure until the two contact each other;
e. Add solvent to one end of the ink supply system at intervals. Be careful not to let the cleaning blade on the other end of the ink supply system become too dry. This method can avoid rollers slipping, ink dropping, and large accumulation of ink on both ends of the roller.
f. Spray the solvent away from the cleaning blade in the ink supply system. Do not add excessive amounts of solvent to avoid waste and dripping.
g. Add the solvent at intervals, until the flow of water to the ink tray looks clean, and the rollers will be clean. Note: Never use your fingers or the fingers while the blade is still working. The rag touches the edge of the blade.
h. Thorough thorough cleaning of the rolls with a water-soluble solution.
i. When the roller is very clean, remove the cleaning blade and the printer will still keep running. Sometimes, when the cleaning blade is released, the accumulated ink on the back surface of the knife will return to the roller, and must be cleaned again.
j. To evaluate the thoroughness of cleaning, stop the press, press the security button, and then wipe the surface of the roller with a rough cloth. If there is any residue on the roller, it will stick to the rough cotton cloth and clearly show see.
Most press ink tanks have a handle at one end that raises the ink fountain roller and moves the ink roller away from the blade (or lowers the ink channel and blade away from the ink fountain roller) and keeps the two separate for easy cleaning. Wipe the remaining ink in the ink tank with a rag soaked in solvent. Any part of the ink tank that comes in contact with the ink should be thoroughly and thoroughly cleaned, not only to clean the edges of the ink tank but also to clean the underside of the blade (where the ink can reach).
Copper plated rollers on older printing presses are usually copper plated. This is usually part of the cleaning process. The copper plating solution deposits a thin layer of copper shell on the surface of the roller, so that the roller has a higher and stronger wear resistance. Copper plating requires that the surface of the roller must be clean and clean. Therefore, it is the best time for copper plating in the cleaning process. On most newer presses, the surface of the metal roll has a plastic (nylon 11) coating that helps reduce roll wear and eliminates the need for copper plated rolls.
The hardness of the roller should be checked regularly (usually once a month). The hardness information of the roller can be used to determine if the roller needs to re-copper or replace the roller. If the hardness of the roller has exceeded the maximum recommended value (usually 10 units higher than the hardness of the new roller), the roller should be unloaded from the printing press. Down and re-coating, if the hardness of the roller is still higher than the highest recommended value, it should be re-polished or recoated. A quick and easy test method is to slide the finger along the surface of the roller (the press should be stopped and in a safe condition). If the fine hair on the roller moves (that is, the surface of the roller feels soft and smooth), the roller is The work on the printing press should be smooth; on the contrary, it may be due to the constant crystallization of the ink roller, and the roller should be removed and processed.
1, cleaning the ink system. The first step in cleaning the ink system is to remove the remaining ink in the ink tank first. The operator can use the ink shovel to carefully remove the remaining ink in the ink tank and throw the excess ink back into the ink tank if the ink is already in the ink. If you leave it in the tank for a few hours, it should be drained. Note: When removing the ink remaining in the ink tank, use a plastic spatula instead of a metal spatula.
The quickest way to remove the ink from the ink roller is to use a cleaning device that includes an adjustable doctor blade and an ink tray (or ink receiver) that is used with specialized solvents. Carefully read the manufacturer's instructions and follow the cleaning and safety guidelines to ensure that the best cleaning results are obtained when using the cleaning device.
Daily cleaning usually involves two-step cleaning. First use a water-soluble solvent to remove dirt, glue, and alcohol substitutes; then use a second solvent to rinse off the first solvent so that there is no solvent on the roller. Residues. Special attention should be paid to the two ends of the roll. During the printing process, the ink is often deposited and agglomerated. Note: Do not wipe the ends of the roller or any part of the ink supply system by hand during operation of the printer. If it is thoroughly cleaned, even if the black ink is replaced with yellow, there will be no black ink remaining problem. Roller manufacturers also recommend this two-step cleaning method to users. Each chemical reagent has a Material Safety Data Sheet (MSDS) provided by the manufacturer. The MSDS provides information on the use, processing and storage of chemical reagents. Details.
Although the cleaning solvents used in practice vary, their efficacy is exactly the same. Each cleaning solution wets the dried ink and causes the pigment particles to dissolve and diffuse. Afterwards, the pigment particles are transferred along the roller to the cleaning device and gradually cleaned; then, the dried glue is rinsed off with water. Between these two steps (or at each step), the solvent in the ink system should be flushed, leaving no residue.
The two solvents in the cleaning solution must be used in the correct order and must not be easily replaced by other solvents.
The printer operator can remove the ink by simply disposing a cleaning device on the printer. After use, the blade and the ink tray of the device must be thoroughly cleaned. The cleaning device cleans the rollers thoroughly, but the operator of the press must know that the rollers are “clean†but are different from “true cleanâ€. The basic steps for using an attached cleaning device are as follows:
a, gluing and drying the Printing Plate to avoid inadvertently dropping ink or cleaning droplets onto the printing plate;
b, start the printing press, and run at medium speed, if it is a new machine, the speed can usually be set between 6000 inches / hour ~ 7000 inches / hour;
c. Rinse the roller away from the cleaning blade with solvent to fully wet the roller and soften the drying ink thereon;
d, let the printing press idle for two minutes, then make the cleaning blade close to the ink roller, and gradually increase the printing pressure until the two contact each other;
e. Add solvent to one end of the ink supply system at intervals. Be careful not to let the cleaning blade on the other end of the ink supply system become too dry. This method can avoid rollers slipping, ink dropping, and large accumulation of ink on both ends of the roller.
f. Spray the solvent away from the cleaning blade in the ink supply system. Do not add excessive amounts of solvent to avoid waste and dripping.
g. Add the solvent at intervals, until the flow of water to the ink tray looks clean, and the rollers will be clean. Note: Never use your fingers or the fingers while the blade is still working. The rag touches the edge of the blade.
h. Thorough thorough cleaning of the rolls with a water-soluble solution.
i. When the roller is very clean, remove the cleaning blade and the printer will still keep running. Sometimes, when the cleaning blade is released, the accumulated ink on the back surface of the knife will return to the roller, and must be cleaned again.
j. To evaluate the thoroughness of cleaning, stop the press, press the security button, and then wipe the surface of the roller with a rough cloth. If there is any residue on the roller, it will stick to the rough cotton cloth and clearly show see.
Most press ink tanks have a handle at one end that raises the ink fountain roller and moves the ink roller away from the blade (or lowers the ink channel and blade away from the ink fountain roller) and keeps the two separate for easy cleaning. Wipe the remaining ink in the ink tank with a rag soaked in solvent. Any part of the ink tank that comes in contact with the ink should be thoroughly and thoroughly cleaned, not only to clean the edges of the ink tank but also to clean the underside of the blade (where the ink can reach).
Copper plated rollers on older printing presses are usually copper plated. This is usually part of the cleaning process. The copper plating solution deposits a thin layer of copper shell on the surface of the roller, so that the roller has a higher and stronger wear resistance. Copper plating requires that the surface of the roller must be clean and clean. Therefore, it is the best time for copper plating in the cleaning process. On most newer presses, the surface of the metal roll has a plastic (nylon 11) coating that helps reduce roll wear and eliminates the need for copper plated rolls.
The hardness of the roller should be checked regularly (usually once a month). The hardness information of the roller can be used to determine if the roller needs to re-copper or replace the roller. If the hardness of the roller has exceeded the maximum recommended value (usually 10 units higher than the hardness of the new roller), the roller should be unloaded from the printing press. Down and re-coating, if the hardness of the roller is still higher than the highest recommended value, it should be re-polished or recoated. A quick and easy test method is to slide the finger along the surface of the roller (the press should be stopped and in a safe condition). If the fine hair on the roller moves (that is, the surface of the roller feels soft and smooth), the roller is The work on the printing press should be smooth; on the contrary, it may be due to the constant crystallization of the ink roller, and the roller should be removed and processed.
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