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Use 1. Requirements for the environment of the rubber roller Printing production in a humid, humid, dusty environment, coupled with high-speed operation of the machine, will increase the surface temperature of the rubber roller, expand the colloid, increase the friction of the rubber roller, affect the quality of the product, and shorten the service life of the rubber roller.
Conditional printing companies, the offset printing workshop should install air conditioning, and keep the workshop clean and clean.
2. Problems that should be paid attention to during printing production (1) The machine must be turned on with the ink. If it is not used, it is necessary to add lubricant. The water roller should also be operated with water, and it must not be “dry-grindedâ€. Otherwise, the rubber roller will be quickly scrapped.
(2) Long-term shutdown will cause the ink roller to be pressed at a certain fixed position, so that there is a possibility of partial depression. At this time, it is best to remove the ink roller and clean it to the ink tray for use. Do not place it directly on the table to prevent partial deformation of the rubber roller.
(3) The aging rubber roller is used for a long time and aging, coupled with the erosion of chemicals, causing the rotten rubber to drop the “slagâ€. Such rubber roller is best updated in time to avoid seriously affecting the quality of the printed product.
(4) When the temperature of the production environment is too low, the ink is not easy to be evenly mixed. It is appropriate to add auxiliary materials to the ink. It is strictly forbidden to use an infrared heater to bake the ink roller.
(5) During the printing operation of the sundries, the offset printing machine should be kept clean and tidy. The tools such as the ink shovel and the printing supplies cannot be randomly placed, and the debris and ink lumps cannot be clamped into the ink roller to scratch and crush the ink roller. .
3. Problems and treatments of the rubber roller in the printing process (1) Surface of the rubber roller crystallization, calcification The surface of the high-quality rubber roller should be fine and smooth, the hand feels slightly viscous, and has good ink transfer performance. In production, the rubber roller is affected by factors such as dampening solution, ink and paper for a long time. In addition, it is impossible to thoroughly clean each time. The residual impurities are deposited on the surface of the rubber roller layer by layer. Over time, the surface of the rubber roller will be closed. The capillary pores form a smooth crystalline layer similar to calcium, which seriously affects the ink transfer and water transfer performance, and cannot stably control the ink color of the print. In this case, after washing with the car wash water, it can be washed again with some citric acid water to chemically react some calcium impurities on the surface of the rubber roller to form a soluble substance for cleaning.
(2) The surface of the rubber roller is easy to have scratches and numbness. Because the rubber roller is soft, a little hard object will be scratched during high-speed operation, especially the alcohol dampening solution is pressed against the plate water roller. Can no longer be used. In order to avoid such failures, the first is to check whether the plate is tightened or the clamp is clamped, so that the cracks and cracks at the printing plate tip are scratched by the plate water roller and the ink roller; the second is to see if the ink roller maintenance is not timely. There are many impurities such as ink, ink residue and so on, which accelerates the friction, heat and aging of the rubber roller, and makes the surface of the rubber roller full of numbness. In this case, the rubber roller is generally more serious.
(3) The rubber roller prematurely splits and aging causes more, such as excessive dry oil in the ink, so that the ink is dry on the rubber roller; the cleaning agent used for cleaning the rubber roller is improperly selected, the cleaning time is too rushed, and the rubber roller is on the rubber roller. Impurities can not be thoroughly cleaned; the ambient temperature of the workshop is high, the dampening system is not working well, and a large amount of heat generated during the operation of the rubber roller cannot be dissipated in time, and the internal temperature of the rubber roller is high; the performance of the rubber roller bearing is not good, and the ink roller is belted. Rotation, resulting in beating friction, extrusion, and the like.
(4) Deinking In the offset printing operation, the ink is emulsified due to "large water and large ink", and a hydrophilic foundation is formed on the smooth rubber roller, and deinking phenomenon occurs. The solution is to shovel the emulsified ink, wash the deinking roller with gasoline, mix the surface with a 5% aqueous solution of sodium hydroxide and talc, remove the hydrophilic layer, and restore the oleophilic properties of the ink roller. At the same time, the metal roller (or hard roller) is also treated accordingly. The hard roller can also be sanded with fine water sand in the state of water drenching, and it should not be fixed at the same part, otherwise the rubber roller will be damaged. The fundamental method is to control the pH value of the water hopper, do a good job of water and ink balance, and reduce the emulsification of the ink.
maintenance
Whether the maintenance of the ink roller is reasonable and in place has a direct impact on the service life of the ink roller and the printing quality.
1. Regular maintenance <br> After each printing, the ink, paper powder and paper wool remaining on the rubber roller should be cleaned. Pay special attention to clean and wipe the residue on both ends of the rubber roller to avoid long-term accumulation of residue. , the two ends of the rubber roller are cracked. The cleaning agent must use the specified chemical reagents, and must not use corrosive solvents; the cloth is preferably knitted with a cloth to prevent cotton residue.
Check whether the bearings at both ends of the rubber roller are freely movable and in good condition. If loose or worn, tighten or replace them in time. When the bearing of the rubber roller is damaged to a certain extent, it will generate the frictional friction and the extrusion, shorten the service life of the rubber roller, and cause the printed product to have an "ink/water bar". The rubber roller should be taken down every week to butter the bearing and replace the bearing with severe wear and poor rotation to ensure the normal use of the rubber roller.
Check if the rubber on the surface of the rubber roller is good, especially the plate rubber roller must choose the best. For rubber sheets with cracks and more eyes on the surface, it should be re-polished and replaced in time.
2. Rotation maintenance of multi-color group <br> In the weekly maintenance, it is difficult to carry out thorough and thorough maintenance of the multi-color platform offset press or the rotary machine. Under the premise of normal day maintenance, according to the equipment, multiple color unit The structural features of the month, the monthly maintenance, half-year maintenance project is decomposed to each week, focusing on maintaining a printing unit every week. This method is also adopted for the rubber roller maintenance of each color group. Every week, all the ink rollers of one color unit are inspected and maintained, and the rubber roller is mainly checked for calcification, whether the bearing is lack of oil, and whether the pressure between the rubber rollers is to be adjusted.
In this month, all the rubber rollers of the whole machine can be rotated at least once. The machine is running normally for about half a year, and then check the maintenance manual for any maintenance contents.
When the color group is rotated and maintained, the personnel should have a reasonable division of labor, cooperate with each other to be tacit, the movement should be standardized, and various tools and detergents should be selected appropriately. No sharp tools can be used to shovel the rollers, rubber rollers, or reducers or bananas. Water cleaning rubber rollers, etc.; also need to make detailed records, including the main parts of maintenance, maintenance methods, hidden dangers found, maintenance plans, etc. Under special circumstances, work that cannot be completed this week should be scheduled in the next week's maintenance schedule to ensure that the maintenance parts are implemented one by one.
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