7.9 Comprehensive Troubleshooting Many failures are related to each other. Therefore, it is necessary to comprehensively consider these failures, that is, to analyze two or more routes. Here are some common examples to analyze the general method of troubleshooting.
7.9.1 Imprinting is not allowed. Improper overprinting. That is, the positional coordination between text and paper is inaccurate. Paper passes through the paper path, and images and texts pass through water and ink paths. Inaccurate paper paths, inaccurate transmission of water and ink, and inaccurate matching of paper paths with water and ink can all lead to overprinting.
Judging from the paper path, accurate overprinting means that the position of each part of the paper in the printing process will change without changing the time and conditions, so long as its position changes, it will result in overprinting. Line overprint is not allowed to be generally divided into front and back printing is not allowed, right and left overprinting is not allowed, left and right front and back at the same time overprinting is not allowed (Taxis Xie Xieren therefore analyzes the paper path overprinting is not allowed to find those who build results Zhang position (before and after, around, before and after And about the same time) changes in factors, and then take appropriate measures to resolve.
1. The paper path is not properly understood.
(1)Inaccurate positioning of rules Carefully check the working condition of the front gauge and gauge gauge, when the paper is positioned before the end of the paper, and when the paper is positioned on the rules, adjust it according to the instructions. At the same time, it should be noted whether the height of the pre-regulatory and regulatory regulations meets the requirements.
(2) The paper is not accurately taken by the paper hand. 1 It is jittery when paper is handed to the paper, which causes unstable handing over: Adjust the paper stopper by the stopper so that it stays still on the paperboard, and the transition is smoothest;
2 Feeding paper teeth axially when pulling paper: Adjust the axial locking nut so that it has a 0.03mm string momentum;
3 Insufficient biting force of paper handing teeth, paper slipping: Increase the biting force, especially at high speeds (this is mainly caused by the inertia of the paper);
4 Inaccurate opening and closing time of the paper-handling teeth: Re-adjust the opening and closing time.
(3) Incompatibility between the paper-feeding teeth and the rules is inaccurate. 1 When the paper-handling teeth have not been taken, the rules have released the paper: the adjustment rules make the hand-over teeth and the rules have a common transfer time;
2 The rules have not yet been positioned: Take the paper and take the paper, adjust according to the above;
(3) When the paper-feeding pick-up paper leaves the paper-feeding board, part of the rules has not been released: adjust the rules so that it can be put in advance;
(4) The height of the dental pad of the pendulum-type delivery paper is not suitable: too low, it will easily impact the paper and cause the paper to shift; too high, the paper will be pulled up when the paper is handed and the teeth will be pulled up, and the position of the paper will also change. Carefully check its position on the cardboard. The general height should be: paper thickness + 0.2mm, which is consistent with the height of the front and side gauges.
(4) Inaccurate transfer between the transfer paper and the front transfer cylinder (or impression cylinder). 1 The transfer time is too short: adjust the position of the corresponding opening and closing teeth cam;
2 The distance between the tooth pads is not suitable: Re-adjust to a distance of: Paper thickness + 0.2mm. However, generally this distance should not be adjusted.
(5) Insufficient bite force of the impression cylinder bite, the pressure of the paper sliding in the impression cylinder is too small: increase the pressure of the dental piece;
2 The friction coefficient of the pad is too small: replace the pad;
3 The viscosity of the ink is too high, add ink or ink remover to reduce the viscosity of the ink;
4 The surface of the blanket is sticky: replace the blanket;
5 Printing pressure is too high: Reduce the printing pressure.
(6) Insufficient bite force of the rear transfer roller teeth, the paper slides in the teeth because the rear transfer roller on the general machine is involved in the printing process in the latter half, so it is required to be the same as the impression cylinder. The troubleshooting method is the same as above.
(7) Insufficient bite force of other teeth on the roller can be referred to (4) and (5).
(8) The bite force of the delivery chain is insufficient. The troubleshooting method is the same as (6).
(9) The axial rotation of all rollers will cause misalignment. Axial movement of the rollers is limited. The double-nut mechanism is generally used. If it is found that the amount of axial movement exceeds the specified requirement (>0.03 mm), adjust the lock nut, generally it should be fully locked, and then reverse one-third turn. After adjustment, be sure to lock the nut. Axial thrust bearing wear can also result in axial movement of the drum and should be replaced if worn. More precisely, it can be tested with a dial indicator.
2. The partial overprint caused by the paper path is not allowed. Partial overprinting refers to the fact that the local position of the paper is relatively slid in the printing process.
(1) When there are only two pre-registration positions, when the paper arrives at the front gauge, the middle part protrudes forward, and the softer the paper, the more prominent this situation is. Reduce the speed or increase the number of rules. So that the day before the paper accurately positioned in the rules.
(2) Insufficient bite force of the individual teeth on the feed dog, causing the first four positions of the paper to change or increase the pressure or replace the tooth pad.
(3) The paper-feeding teeth have a non-uniform amount of paper, and there are many sides, and there are few side, and there is a tendency for relative slippage in parts where the amount of paper is small. Adjust the front gauge to make it evenly bite.
(4) The bite force of the individual teeth on the impression cylinder is insufficient to replace the pad or increase the bite force.
(5) Partial printing pressure is too high, resulting in increased resistance to paper advancement, which can cause papers in the area to be checked for blankets and liners and recalibrate printing pressure.
(6) The surface of the printing plate is not well-distributed. The site of the paper is unreasonable. The paper tends to slide relative to it, adding ink or reducing printing pressure.
(7) The paper is swollen by water, which causes the rear half of the paper to be damped before the paper is printed.
3. Inaccurate printing caused by water and ink roads.
(1) Loosening of the plate Since the plate is loose, the position of the imprint is changed during the printing process, so it is impossible to overprint. Adjust the fastening screw and snap the plate.
(2) The lining underneath the printing plate is not suitable, so that the size of the print mark becomes larger or smaller, resulting in overprinting the thickness of the pad, and re-lining the pad according to the technical specification.
(3) Loose rubber market Looseness of the rubber blanket changes the position of each imprint, resulting in inaccurate overprinting.
(4) When the amount of water is too large, the paper tension becomes smaller, and the paper is easily deformed by pulling and reducing the amount of water.
(5) The amount of ink applied is too large, causing the paper to slide in the cavities to reduce the viscosity of the ink.
4. Overprinting caused by the plate making section is not allowed.
(1) When the imposition is not permitted, crosshairs or corner lines are used as the reference line when printing is prohibited, and the crosshair line is also used as the reference when making imposition. If the coordinates between the graphic and the rule lines are inaccurate, it is extremely difficult, and sometimes impossible, to overprint when printing. Therefore, the imposition accuracy should be maximized.
(2) If printing is not allowed during the printing, if it is a livelihood of the sun, this problem does not usually exist. Two or more sun exposures are prone to such problems. Therefore, we should try our best to avoid the sun and the sun. If it is necessary to do this, you should first rotate paper.
(3) Deformation of the plate when the plate is pulled The deformation of the plate due to the poor resistance of the plate is easily deformed by a large force, and sometimes even a crack occurs. Therefore, it is not advisable to use too much force when drawing a plate.
(4) Misalignment due to process layout 1 A multi-color overprinting job is prone to overprinting. The more times the overprinting occurs, the greater the possibility of error. Therefore, the overprinting times should be minimized.
2 Multi-colored overprinted words or lines are most likely to be overprinted, so spot colors should be used instead of overprinting in these situations. A reasonable process can also be used to minimize the number of overprints and minimize the possibility of errors. (To be continued)
7.9.1 Imprinting is not allowed. Improper overprinting. That is, the positional coordination between text and paper is inaccurate. Paper passes through the paper path, and images and texts pass through water and ink paths. Inaccurate paper paths, inaccurate transmission of water and ink, and inaccurate matching of paper paths with water and ink can all lead to overprinting.
Judging from the paper path, accurate overprinting means that the position of each part of the paper in the printing process will change without changing the time and conditions, so long as its position changes, it will result in overprinting. Line overprint is not allowed to be generally divided into front and back printing is not allowed, right and left overprinting is not allowed, left and right front and back at the same time overprinting is not allowed (Taxis Xie Xieren therefore analyzes the paper path overprinting is not allowed to find those who build results Zhang position (before and after, around, before and after And about the same time) changes in factors, and then take appropriate measures to resolve.
1. The paper path is not properly understood.
(1)Inaccurate positioning of rules Carefully check the working condition of the front gauge and gauge gauge, when the paper is positioned before the end of the paper, and when the paper is positioned on the rules, adjust it according to the instructions. At the same time, it should be noted whether the height of the pre-regulatory and regulatory regulations meets the requirements.
(2) The paper is not accurately taken by the paper hand. 1 It is jittery when paper is handed to the paper, which causes unstable handing over: Adjust the paper stopper by the stopper so that it stays still on the paperboard, and the transition is smoothest;
2 Feeding paper teeth axially when pulling paper: Adjust the axial locking nut so that it has a 0.03mm string momentum;
3 Insufficient biting force of paper handing teeth, paper slipping: Increase the biting force, especially at high speeds (this is mainly caused by the inertia of the paper);
4 Inaccurate opening and closing time of the paper-handling teeth: Re-adjust the opening and closing time.
(3) Incompatibility between the paper-feeding teeth and the rules is inaccurate. 1 When the paper-handling teeth have not been taken, the rules have released the paper: the adjustment rules make the hand-over teeth and the rules have a common transfer time;
2 The rules have not yet been positioned: Take the paper and take the paper, adjust according to the above;
(3) When the paper-feeding pick-up paper leaves the paper-feeding board, part of the rules has not been released: adjust the rules so that it can be put in advance;
(4) The height of the dental pad of the pendulum-type delivery paper is not suitable: too low, it will easily impact the paper and cause the paper to shift; too high, the paper will be pulled up when the paper is handed and the teeth will be pulled up, and the position of the paper will also change. Carefully check its position on the cardboard. The general height should be: paper thickness + 0.2mm, which is consistent with the height of the front and side gauges.
(4) Inaccurate transfer between the transfer paper and the front transfer cylinder (or impression cylinder). 1 The transfer time is too short: adjust the position of the corresponding opening and closing teeth cam;
2 The distance between the tooth pads is not suitable: Re-adjust to a distance of: Paper thickness + 0.2mm. However, generally this distance should not be adjusted.
(5) Insufficient bite force of the impression cylinder bite, the pressure of the paper sliding in the impression cylinder is too small: increase the pressure of the dental piece;
2 The friction coefficient of the pad is too small: replace the pad;
3 The viscosity of the ink is too high, add ink or ink remover to reduce the viscosity of the ink;
4 The surface of the blanket is sticky: replace the blanket;
5 Printing pressure is too high: Reduce the printing pressure.
(6) Insufficient bite force of the rear transfer roller teeth, the paper slides in the teeth because the rear transfer roller on the general machine is involved in the printing process in the latter half, so it is required to be the same as the impression cylinder. The troubleshooting method is the same as above.
(7) Insufficient bite force of other teeth on the roller can be referred to (4) and (5).
(8) The bite force of the delivery chain is insufficient. The troubleshooting method is the same as (6).
(9) The axial rotation of all rollers will cause misalignment. Axial movement of the rollers is limited. The double-nut mechanism is generally used. If it is found that the amount of axial movement exceeds the specified requirement (>0.03 mm), adjust the lock nut, generally it should be fully locked, and then reverse one-third turn. After adjustment, be sure to lock the nut. Axial thrust bearing wear can also result in axial movement of the drum and should be replaced if worn. More precisely, it can be tested with a dial indicator.
2. The partial overprint caused by the paper path is not allowed. Partial overprinting refers to the fact that the local position of the paper is relatively slid in the printing process.
(1) When there are only two pre-registration positions, when the paper arrives at the front gauge, the middle part protrudes forward, and the softer the paper, the more prominent this situation is. Reduce the speed or increase the number of rules. So that the day before the paper accurately positioned in the rules.
(2) Insufficient bite force of the individual teeth on the feed dog, causing the first four positions of the paper to change or increase the pressure or replace the tooth pad.
(3) The paper-feeding teeth have a non-uniform amount of paper, and there are many sides, and there are few side, and there is a tendency for relative slippage in parts where the amount of paper is small. Adjust the front gauge to make it evenly bite.
(4) The bite force of the individual teeth on the impression cylinder is insufficient to replace the pad or increase the bite force.
(5) Partial printing pressure is too high, resulting in increased resistance to paper advancement, which can cause papers in the area to be checked for blankets and liners and recalibrate printing pressure.
(6) The surface of the printing plate is not well-distributed. The site of the paper is unreasonable. The paper tends to slide relative to it, adding ink or reducing printing pressure.
(7) The paper is swollen by water, which causes the rear half of the paper to be damped before the paper is printed.
3. Inaccurate printing caused by water and ink roads.
(1) Loosening of the plate Since the plate is loose, the position of the imprint is changed during the printing process, so it is impossible to overprint. Adjust the fastening screw and snap the plate.
(2) The lining underneath the printing plate is not suitable, so that the size of the print mark becomes larger or smaller, resulting in overprinting the thickness of the pad, and re-lining the pad according to the technical specification.
(3) Loose rubber market Looseness of the rubber blanket changes the position of each imprint, resulting in inaccurate overprinting.
(4) When the amount of water is too large, the paper tension becomes smaller, and the paper is easily deformed by pulling and reducing the amount of water.
(5) The amount of ink applied is too large, causing the paper to slide in the cavities to reduce the viscosity of the ink.
4. Overprinting caused by the plate making section is not allowed.
(1) When the imposition is not permitted, crosshairs or corner lines are used as the reference line when printing is prohibited, and the crosshair line is also used as the reference when making imposition. If the coordinates between the graphic and the rule lines are inaccurate, it is extremely difficult, and sometimes impossible, to overprint when printing. Therefore, the imposition accuracy should be maximized.
(2) If printing is not allowed during the printing, if it is a livelihood of the sun, this problem does not usually exist. Two or more sun exposures are prone to such problems. Therefore, we should try our best to avoid the sun and the sun. If it is necessary to do this, you should first rotate paper.
(3) Deformation of the plate when the plate is pulled The deformation of the plate due to the poor resistance of the plate is easily deformed by a large force, and sometimes even a crack occurs. Therefore, it is not advisable to use too much force when drawing a plate.
(4) Misalignment due to process layout 1 A multi-color overprinting job is prone to overprinting. The more times the overprinting occurs, the greater the possibility of error. Therefore, the overprinting times should be minimized.
2 Multi-colored overprinted words or lines are most likely to be overprinted, so spot colors should be used instead of overprinting in these situations. A reasonable process can also be used to minimize the number of overprints and minimize the possibility of errors. (To be continued)
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