The common faults of the offset ink path of the offset press are solved, and the fault of the ink path is that the ink that is transmitted to the paper does not reach the ideal state. The ideal state of the so-called ink on paper is: uniform ink, moderate density. The troubleshooting of ink roads must also follow the benchmark principle. The benchmark of the ink path is the impression cylinder, and it is of practical significance to adjust the ink path based on it. The following general method of troubleshooting the ink path is analyzed through the drive of the ink path.
1. The ink fountain is under the ink
(1) The gap between the ink fountain and the ink fountain roller is too small Adjust the ink fountain screw to increase the clearance.
(2) Dirt in the ink fountain (such as ink or paper, etc.) Blocks the gap between the ink fountain blade and the ink fountain roller.
a. Increase the gap, so that paper or dirt and other dirt can fall through the gap to the ink tray;
b. Mix the ink fountains so that the dirt can not always be blocked in the ink.
(3) ink can not open
a. The temperature is too low, increase the temperature; b. The ink is too thick, add the ink or remove agent; c. The ink is not stirred for a long time, the ink is solidified, and the ink fountain is stirred.
(4) There is too little ink in the star bucket
a. Add ink to ink fountain;
b. Diligently stir the ink fountain.
(5) The ink fountain roller is too small to increase the ink fountain roller rotation angle.
2. Ink roller surface scratch
(1) The two corners of the ink knife are too sharply angled to the two corners of the round ink knife;
(2) Too tight between the ink opening blade and the ink fountain roller Even if there is no ink, there should be a gap between the ink fountain blade and the star roller.
(3) When the ink is not in the ink fountain, the ink fountain may be formed when there is no ink between the individual parts of the ink fountain blade and the ink fountain roller;
(4) In the ink fountain, there are hard dirt in the oil, such as sand, stones, etc., to remove the dirt in the ink fountain and increase the clearance.
3. Ink well inked too much
(1) The gap between the ink fountain blade and the ink fountain roller is too large to adjust the ink fountain screw and reduce the gap;
(2) The bucket roll angle is too large to reduce the corner;
(3) Too much ink in the ink fountain reduces the amount of ink loaded and should generally not exceed two-thirds of the maximum volume of the ink fountain.
4. Ink flow under ink fountain
(1) The temperature is too high, the ink becomes too thin to reduce the temperature or add No. 0 varnish;
(2) Too much of the No. 6 varnish or remover removes the ink in the ink fountain and replaces it with the original ink;
(3) Reduce the gap between the ink fountain blade and the ink fountain roller.
5. The ink transfer roller does not transfer ink
(l) The pressure between the transfer roller and ink fountain roller is too small to increase the pressure (no ink on the transfer roller at this time);
(2) The pressure between the transfer roller and the serigraph roller is too small to increase the pressure (in this case there is ink on the roller);
(3) The ink fountain roller does not turn or the rotation angle is too small to increase the rotation angle of the ink fountain roller;
(4) The ink transfer wear is serious, and the right and left diameters are different and the ink transfer roller is replaced;
(5) The ink transfer roller does not swing
a. The pin at both ends of the transfer roller is broken; replace the new pin;
b. The spring that drives the ink roller is broken or deformed too much: replace the spring;
(6) Abrasion roller bearing wear at both ends Replace the bearing.
6. Bad ink string ink
(1) The ink volume of the skein roller is too small to adjust the eccentricity and increase the amount of ink.
(2) The ink on the surface of the ink string is exchanged and deinked to replace the ink string;
(3) The surface of the ink roller is too big to change the ink roller or remove the rework;
(4) The timing of the ink flow rate of the ink stringer does not change the ink serial timing (some machines can be changed, and some machines cannot be changed);
(5) Dirty cleaning rollers on the surface of the ink roller.
7. Uniform ink roller bad ink
(1) The uniform ink roller is not installed in place and reinstalled;
(2) Uniformly roll wear to replace uniform ink roller;
(3) Too much ink at both ends of the ink distribution roller is removed and cleaned;
(4) Bearings at both ends of the uniform ink roller are damaged and bearings are replaced;
(5) Aging roller surface aging, lost elastic replacement uniform ink roller.
8. Inking roller bad ink
(1) The pressure between the ink roller and the ink string is too small, and the ink is not transferred to increase the pressure;
(2) The pressure between the ink roller and the ink roller is too large, and the ink is squeezed to reduce the pressure;
(3) The pressure between the ink roller and the printing plate is too small, and the ink is not transferred to increase the pressure in the past;
(4) The pressure between the ink roller and the printing plate is too large, and the imprinting deformation is too large to reduce the pressure;
(5) Ink roller axial movement too large to remove the two ends of the seat, re-install;
(6) The clutch mechanism of the ink roller is not working properly
a. Force closing spring failure: Replace the spring;
b. The rotary shaft of the clutch mechanism is poorly lubricated: Lubrication is added;
c. Coupling mechanism above the plug adjustment is not appropriate: according to the requirements, re-adjust;
(7) Other troubles of the ink roller are solved with uniform ink roller.
9. Heavy roller working bad
(1) The heavy roller is not in place to remove and reinstall;
(2) Paper fluff and impurities on the surface of the heavy roller are not cleaned and return to the ink path to clean the heavy roller;
(3) Damage to the bearing at both ends of the heavy roller Replace the bearing.
10. Bad plate transfer ink
(l) uneven printing plate surface;
(2) The hydrophilic and ink-receptive properties of the surface of the printing plate are not good for printing;
(3) The surface of the plate cylinder is not readjusted to its level;
(4) The axial rotation of the printing plate cylinder locks the axial locking nut of the plate cylinder so that it has a 0.03 mm string momentum;
(5) The bearing of the plate cylinder is damaged to replace the bearing;
(6) printing plate cylinder surface stacking clean and then on the plate;
(7) The pad under the plate is not flat to change the pad;
(8) The printing plate slips on the roller without locking;
(9) The surface of the printing plate is dirty and then printed;
(10) The surface of the printing plate is scratched and the printing is continued after erasing the adhesive or ink.
11. Bad roller transfer ink
(1) The blanket itself is not replaced or shimmed;
(2) The pad under the blanket is not smooth and the pad is replaced;
(3) The liner under the blanket is too smooth to be replaced with a rough surface liner;
(4) The rubber blanket itself is aging to replace the rubber market;
(5) The rubber roller itself is not leveled with a spirit level;
(6) The blanket cylinder is cleaned and then printed;
(7) The blanket is not tightly fitted to rotate the worm gear and the rubber is tensioned;
(8) The elasticity of the blanket is removed and reinstalled;
(9) Rubber roller axially adjust the locking nut on the shaft to make it have a 0.03mm string momentum;
(10) The bearing on both sides of the blanket cylinder is damaged Replace the bearing.
12. Paper is badly inked
(1) The surface sizing of the paper is too bad (the pulling speed is too low) to print or replace the paper after printing a layer of varnish;
(2) The surface of the paper is seriously uneven and the paper is pressed (not inked) before printing.
(3) The surface of the paper is poor in ink absorption and increases its ink absorption;
13. Bad impression cylinder
(1) The surface of the impression cylinder is not flat and its level is corrected;
(2) The surface of the impression cylinder has been cleaned and then printed;
(3) Adjust the pinning nut in the axial direction of the impression roller so that it can have a 0.03mm string momentum;
(4) The bearing of the platen roller is damaged Replace the bearing.
14. Disengagement pressure mechanism is not working properly
(1) Insufficient distance, no linkage deformation of the home linkage mechanism, replacement of deformed connecting rods;
(2) The clutch pressure timing does not adjust the position of the clutch cam. Make it accurately clutch;
(3) The bearing on the pendulum rod of the press-fit mechanism is damaged. Replace the bearing.
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