Sheetfed Lithographic Offset Common Fault Analysis and Processing Serial (1)

The printing factory of Zhongyuan Oilfield Education Center in Liyang City, Henan Province, Hong Fushun Gaobao Prefecture, has often caused some common faults in the process of sheet-fed offset printing, including mechanical, technological raw materials, working environment, and operation skill level, affecting normal production and products. quality. In order to improve product quality, promote production process, in order to reduce or avoid the occurrence of some common faults, it is very necessary to summarize and analyze them. The following are some of the major common faults that we have summarized in the long-term work of sheet-fed lithographic offset printing, and we have made a shallow analysis of it, only for the exchange of experience with colleagues and the use of skills. Failure of a water roller is easy to hang dirty causes: 1, the ink is too thin; 2, the amount of fountain solution is too small; 3, lack of water within the bucket; 4, rely on the version close the water on the roller to add enough water, no waiting for the water roller Sufficient moisture to print; 5, after washing the water roller with gasoline or detergent, there are more gasoline or cleaning agent left on the water roller; 6. Ink emulsion is too serious; 7. The ink is too viscous, easy to adhere to the water roller 8. Reliance on the distance from the printing roller after the printing plate is too small is easily contaminated with the ink on the roller; 9. The roller is contaminated with lubricating grease; 10. The printing ink flow is too high; 11. The gasoline or cleaning agent is used. Contamination of the water roller when washing ink; 12, too much paper powder accumulated on the water roller; 13, when cleaning the layout with gasoline or cleaning agent, the plate roller does not leave the layout; 14, the ink contains too much additive; One end of the water transfer roller does not have a water roller; 16, one end of the water transfer roller is too light on the string water roller; 17. When printing, the full roller is affected due to the water roller not depending on the plate, and the water roller is directly applied on the printing plate to close. Ink roller to deal with faulty paste; 18, grease on the rubber, when printing through the plate into the water roller; 19, water roller Detachment caused by; 20, string water roller sleeve wear serious or groove; 21, the role of the water roller on the plate too much power; 22, water roller sleeve water retention performance is poor; 23, water roller sleeve wear No adjustments were made afterwards. 24. The use of water rollers for a long time caused the stickiness of the water roller cover. 25. The ink flow rate was increased due to the low temperature in the printing shop, and the ink flow became too high after high-speed printing; 26 , Printing ink consumption is too large; 27, after cleaning the rubber, the rubber on the left more cleaning agent or gasoline, and direct printing; 28, ink roller sometimes can not leave the layout caused; 29, part of the outlet roller dip There is ink, resulting in poor water on the water roller at the site; 30. The water roller and the reel roller have too little force; 31. The water roller motor is faulty, the rotation is not flexible or can not be rotated; 32, The water roller coating Damaged, easily worn water sleeves cause. Treatment methods: 1, replace the ink or add more fluidity of the ink to make adjustments; 2, adjust the amount of fountain solution; 3, add fountain solution in a timely manner and to maintain the liquid level of the water fountain; 4, turn the machine so that The water roller relies on the printing plate, and then prints after the water on the water roller is even; 5. Thoroughly clean the residual material on the water roller; 6. Clean the emulsified ink and adjust the dosage of the fountain solution properly; 7. Replace the ink; Make appropriate adjustments to make the water roller off the plate to avoid the ink on the roller is appropriate; 9, thoroughly cleaned with a cleaning agent; 10, the ink flow in the printing field must not be too large, not too much with ink; 11 Soaking in the pool and repeated brushing; 12, cleaning the water roller; 13, so that the plate roller after leaving the layout with gasoline or cleaning agent cleaning plate; 14, under normal circumstances, the additive content of the ink up to 15%; 15 , for specific adjustments; 16, if due to the small spring tension caused by the force should be increased tension spring, and both ends of the same; 17, when the full version of the batter, should clean the ink on the plate and then make the water roller Rely on plate; 18, cleaning rubber and water roller; 19, banding or replacement; 20 , Reinstall or replace the sleeve; 21, adjust the water roller, so that the force of the water roller and printing plate between 0.20 ~ 0.30mm; 22, replace the water roller sleeve; 23, with the use of different degrees of water roller sleeve to adjust the specific 24, should be cleaned regularly; 25, the beginning of the use of more fluid ink, after printing for a period of time to add appropriate fluidity of the ink; 26, the amount of ink should be moderate; 27, should thoroughly wipe the eraser and then print; 28 , proper repair, should be flexible and reliable ink roller clutch; 29, with cleaning agent or gasoline cleaning water roller; 30, with a feeler for proper adjustment; 31, due to motor coil short-circuit caused by the replacement of the motor coil; 32, replacement string Water roller. Failure of the second blanket is easy to be bruised because: 1. There are hard blocks in the paper; 2. There are piles of shredded paper in the paper; 3. There are too many double sheets or too many sheets; 4. The paper wrinkles are serious; If the chain lining chip breaks or looses and falls into the paper, it will easily crush the rubber when printing again; 6. The belt is broken between the rubber and the impression cylinder; 7. When cleaning the machine, there is a large amount of The ink residue is dropped between the impression cylinder and the rubber; 8, there is sand in the paper; 9. The impression roller bites the paper pressure pressure blanket when printing; 10. The ink residue and other dirt on the impression roller are attached Object; 11, plate clamp screw off is pressed between the printing plate and the rubber; 12, pull the pull head fixing screw loose off the gap between the rubber and the impression roller; 13, pull the extension spring is dropped on the imprint Between the roller and the rubber; 14, the printing machine feeder parts of the screws fall, printing with the paper is pressed between the rubber and the impression roller; 15, the old PS version of the bite is too thin, under the impact of the printing pressure , resulting in the version clipped to fall between the printing plate and the rubber; 16, due to the plate at the mouth of a long crack, resulting in the printing process is caught off the printing plate and eraser Interim, 17, blanket lining or liner is seriously uneven; 18, the back of the printing plate is dirty with dirt resulting in the plate after the local plate raised too much; 19, the printing process suction nozzle rubber drops fall on the blanket Between the printing cylinder and the printing cylinder; 20, the splattered splatters of the air-pumped heat-dissipating air page are dropped on the paper-feeding plate and pressed against the rubber room. Treatment methods: 1. Replace paper, rubber damage should be properly repaired or replaced; 2. Replace paper, repair or replace the blanket; 3. Should use empty double-sheet controller when printing, and be flexible and reliable, the rubber is crushed by the paper Should be given to repair or replace; 4, replace the paper; 5, regularly check the use of bite teeth, rubber damage caused by the falling tooth chip should be properly repaired or replaced; 6, the conveyor belt joints should be solid, and to regularly check Rubber damage caused by the disconnection of the conveyor belt should be repaired or replaced. 7. When cleaning the machine, no debris such as ink residue should be dropped between the eraser and the embossing cylinder. Rubber damage caused by debris should be repaired or replaced. 8, replace the paper, properly repair or replace the blanket; 9, for the appropriate adjustment, printing pressure when the bite of paper just do not touch the rubber is appropriate, the rubber is crushed paper teeth should be given replacement, the degree of damage is light Can be adjusted to the bite, so that the indentation to avoid the use of the scope; 10, should pay attention to cleaning the impression cylinder, resulting rubber damage should be given to repair or replace; 11, the plate should be on the version of the clamp screw Tighten one by one, shall not be omissions, rubber damage caused by the falling screw should be replaced; 12, should regularly check the loose pull fixed screws, because the screw drop crushed rubber, should be properly repaired or replaced the rubber; 13. Fix the spring and check it regularly. The damage to the rubber caused by the drop of the spring should be replaced. 14. Fix the screw on the feeder part of the printing machine and check it regularly. The screw that is dropped by Feida crushes the rubber. Should be adjusted, repair or replace the rubber; 15, found that the old PS version of the mouth is too thin, should avoid the use of the plate clip drop caused by the blanket is crushed, should replace the new blanket; 16, when the plate Should pay attention to inspection, to prevent the use of edge slit plate, the resulting rubber damage should be replaced with a new rubber; 17, replace the interlining or liner, by the interlining or liner rubber damage should be properly repaired or replaced; 18, on Version should pay attention to check the back of the plate, resulting in damage to the blanket should be properly repaired or replaced; 19, the printing process should pay attention to check the suction nozzle rubber, blanket caused by suction rubber rubber blanket Bad should be properly repaired or replaced; 20, regular maintenance should pump in order to avoid splashing out cooling wind page debris phenomenon, rubber damage caused by flying debris caused by out should be repaired or replaced. Failure of the three ink easy to unbalance reasons: 1, not according to different wading performance of the ink to adjust the water; 2, with a large amount of ink, water consumption is small; 3, a large amount of water, with a small amount of ink; 4, printing pressure increased printing halfway Too large; 5, after the water roller is gradually dirty, it is not adjusted accordingly; 6. The water roller is seriously dirty, and the amount of water is not adjusted after washing; 7. The liquid level of the water fountain cannot be maintained; 8. The water fountain liquid is printed during printing. PH value change is too large; 9, the use of the water temperature of the fluid is too large; 10, the water roller gradually hanging caused by dirty; 11, printing halfway to change the thickness of the pad and rubber pad thickness; 12, mixed with printing ink; 13. Change the force of the printing roller on the printing plate in the middle of printing; 14. Suddenly change the ink fluidity and add too much additive; 15. The air conditioner in the workshop gradually changes to make the workshop temperature too high or too low; 16. Indoor The heating equipment suddenly warms up, changing the temperature and humidity of the workshop; 17, the workshop is dry, and the air humidity is gradually changed with a humidifier; 18, the liquid level of the water bucket suddenly increases too much; 19, the ink is used to gradually aging, there is no corresponding adjustment of moisture; 20, ink drying , Downtime is too long; 21, the paper is acidic, gradually affect the PH value of the water fountain; 22, is using a very damp fountain solution suddenly use fresh fountain solution; 23, with long-term flow of water in the water pipe版版; 24, the amount of fountain solution does not change, suddenly increase or decrease the amount of ink; 25, the amount of ink transfer in the printing process is too different; 26, the water hopper fluid acid change, and did not clean the bucket in time; 27 , the speed caused by instability; 28, the amount of ink transfer is particularly large; 29, the printing process suddenly changed the ink flow too much; 30, the use of ink is too old, suddenly added more fresh ink. Treatment methods: 1, should be based on the type of ink, color to adjust the moisture; 2, there should be appropriate use of ink, the amount of water should be determined with the ink situation; 3, the amount of ink should be moderate, the amount of water should meet the requirements of the printing product; 4. Printing pressure shall not be arbitrarily increased in the middle of printing. If it is necessary to increase the printing pressure, attention should be paid to adjusting the moisture. 5. The long-term water retention performance of the water roller will gradually decrease, so it is necessary to pay attention to adjusting the amount of fountain solution. Poor water retention after dirt, water retention performance after washing, so before washing and washing should pay attention to adjust the amount of water supply; 7, printing liquid level should be maintained at a certain height; 8, should adjust the PH value of water, so that It is between 5 and 6; 9. The fluid temperature of the fountain solution should be stable; 10. The water roller should be cleaned frequently; 11. The printing pressure, plate gasket thickness, and rubber gasket thickness must not be changed at will, even if it is replaced. When different thickness of rubber or printing plate, it should also meet the requirements of the total thickness of the pad; 12, different specific gravity of different types of ink can not be mixed; 13, change the ink roller on the plate force greater attention should be paid to fine-tune the water; 14, the entire India The process should allow the ink to maintain the same fluidity, additives can not be too much, if for some reason need to change the flow of the ink should pay attention to moisture regulation; 15, should pay attention to adjust the amount of water, but also should pay attention to the printability of the ink; 16, adjust the amount of water, while the ink flow should be reduced to some; 17, printing should be adjusted slightly smaller water in order to achieve a good state of ink and water balance; 18, the bucket level should always remain the same; 19, ink aging Easily emulsified, so it should reduce the amount of water; 20, downtime should not be too long, if you have been shut down should be cleaned off the ink on the roller; 21, should constantly adjust the fountain solution, so that the PH value at 5 ~ 6; 22, should be used fresh dampening fluid, poor ink balance, should adjust the amount of water; 23, the use of commonly used water in the water pipe fountain solution; 24, ink dosage changes, should adjust the amount of water 25, printing products are different, the amount of ink transfer is different, should pay attention to adjust the moisture; 26, should be often used to clean the fountain liquid, in order not to affect the ink, the printability of the paper prevail; 27, the best print speed, the best speed 28, the amount of ink transfer can not be too large, so that the ink is not easy to balance; 29, the printing process, the ink flow should be stable, even if the change in the ink flow, it should adjust the amount of fountain solution; 30, should continue to add ink, It is not appropriate to wait for the ink to age before adding it, so as not to affect the ink balance. Failure of the four imprinted dry slow causes: 1, ink emulsification is too serious; 2, paper PH value is too low; 3, the ink is too thin; 4, there is no correct choice of fountain solution for the print product; 5, there is no right choice for print products Ink; 6, the workshop humidity; 7, paper is too humid; 8, the workshop temperature is too low; 9, the ink in the transfer of ink, remove the adhesive, etc. too much; 10, the paper is poor ink absorption