7.9.2 Ghosting Ghosting is the appearance of two or more identical prints on a print and its positional power is close. Therefore, ghost troubleshooting is to find out the factors that cause misprints.
1. The plate is loose. Due to the looseness of the printing plate, the position of the printing plate during the printing process cannot be kept constant, so that the positions of the new and old printing spots that are transferred to the printing material twice are not the same, and thus ghosting will appear on the printing sheet. Re-clamp the printing plate. The screws on the circumference and on both sides must be in working condition. This can keep the relative position of the printing plate's printing plate and the plate cylinder; the adjustment of the plate clearance on the printing plate ensures the printing process. The relative position of the printing plate and the printing plate is unchanged; the printing plate is pressed together so that the printing plate can be closely enclosed on the printing plate cylinder.
2. The blanket is loose. Since the blanket loosens in two different positions during the contact with the plate (or impression cylinder), both new and old marks are left on the blanket, and ghosting will inevitably occur upon transfer to the print. The position of the rubber clips on the rubber clips is not correct. Reinstall the cards to ensure that the blankets are in close contact with the plugs on the clips. Also, tighten the screws first and then tightly on the two sides to prevent the middle of the blanket from accumulating. The tension of the cloth is too small. The worm gear mechanism is used to tighten the blanket by the reporter's hand. The gasket that has fallen under the blanket is not even, resulting in a loose blanket in some places and a tight rubber blanket in some places. Replace the gasket.
3. The paper slides on the impression cylinder. When the printed sheet is printed in the first color and then enters the second color after the multicolor printing, since the printed sheet is not completely dried, the first color of the printed edge is transferred to the second when in contact with the second colored eraser. On a color blanket. If there is a change in the position of the paper and the other parts are in good working condition, the first color print on the subsequent print sheet should completely coincide with the first color print on the second color blanket because there is no ghost image; otherwise It will produce ghosting. The pressure of the die on the impression cylinder is too small to increase the pressure of the die. The pad on the impression roller wears badly and the pad is replaced. The pressure of the impression roller is too small to adjust the rules and increase the amount of bite paper. Printing pressure is too high to reduce printing pressure; ink viscosity is too large, add ink or ink remover to reduce the viscosity of the ink; full version thick, replaced by a soft liner.
4. The paper is deformed. The surface of the paper is not even, and the dampness of the paper will cause the old and new blots to not coincide. It is possible to use the machine to compress (Sheung Shui, but not ink) the paper, so that the paper is basically flat after it is imprinted. And because it already absorbs a certain amount of water, it is much less likely to reabsorb.
5. The roller's movement. Rolling of other transfer cylinders, such as plate cylinders, blanket cylinders, etc., will cause the old and new blots to not coincide and produce ghost images. Carefully inspect these roller axial eye position devices, improper re-adjustment, generally the amount of string is controlled within 0.03mm.
6. The layout of the layout is not reasonable. The field swapping and mesh blocks should be arranged correctly, and generally should be distributed as evenly as possible in the axial direction so that the viscous force of the ink is evenly distributed along the axial direction, thereby reducing the possibility of paper slipping.
7.9.3 Water, ink, and ink bars are water lines or lines of ink appearing on the axis (or horizontal). The waterline is caused by the fact that the water is not printed on the ink or printed too little; the ink line is caused by the large ink and the ink is printed too much. The causes of water and ink bars are numerous and complex. Below from a different point of view to briefly analyze the causes and exclusion methods.
1. The water pressure is too great. Because the pressure of the water roller is too large, the impact generated when the roller is in contact with the printing plate is also large, so that the amount of water on both sides of the impact point of the water roller is larger than the amount of water in other parts around it. After the water roller rotates one revolution, the large part of the water is in contact with the printing plate, so that the ability to ink at the place is weakened, thereby forming a water bar. The water roller pressure should be reduced at this time.
2. The water roller is not round. Because the water roller is not round, some places are high and some places are low. In places where it is high, it slides when it comes in contact with the plate, causing water to accumulate and form water bars. The water roller should be replaced.
3. The pressure of the ink roller is too high. The reason for this analysis is the same as 1, except that the amount of ink on both sides of the impact increases, thereby forming an ink stick.
4. The ink roller is not round. Its analysis is the same as 2.
5. Printing pressure is too high. As the printing pressure is too high, the impact of the drum when switching between the notch and the non-notch is too large, resulting in vibration of the drum, so that the water, ink roller and the surface of the plate cylinder also produce impact, thereby producing water and ink bars. The solution is to reduce the printing pressure.
6. Roller gear wear or machining accuracy is too low. After the accuracy of the gear is destroyed, unevenness occurs in the rotation of the drum, which causes relative slippage between the water, the ink roller and the printing plate, forming water and ink society. At this point should replace the freighter or change the meshing position of the gear.
Once the water and ink bars appear, the consequences are very serious. Therefore, the causes must be identified in a timely manner and be eliminated.
7.9.4 Paper Folding Paper Folding means that the surface of the paper is not horizontal, so that when it is printed, the protruding area is flattened to form pleats. Prints with pleats are generally unacceptable.
1. The paper is not flat at the rules. Because the paper is in an irregular state at the rules, when printing is performed, the irregularities are flattened to form a grid.
(1) Change the position and direction of the pressure roller on the paper feeder to make it easier for the paper to be flat.
(2) Increase the number of front gauges so that the paper does not bend forward in the rules.
(3) For the pendulum-type transfer paper teeth, the distance between the teeth and the rule weight should be equal to or slightly lower than the distance between the front cap and the rule plate.
2. There is a half tooth phenomenon in the gripper. When the gripper teeth are half-toothed, the paper can easily slide inside the tusks, thus causing the surface of the paper to become uneven and forming pleats during printing. Try to think of ways to bite paper on two-thirds or more of the cavities in the width direction.
3. Handing paper is more uneven, more on one side and less on one side. The lesser side is prone to slip during delivery, resulting in unevenness of the paper surface. Adjust the rules so that the amount of paper gripper can meet the requirements of the paper does not slide.
4. Printing pressure is too high. Due to the high printing pressure, the papers at the individual cavities appear to slide relative to each other, causing the paper surface to be uneven. Reduce the printing pressure or increase the friction of the impression cylinder gripper.
5. The ink is too sticky. Due to the stickiness of the ink, the resistance to the forward conveyance of the paper increases, so that the individual parts of the paper slide back and the surface of the paper becomes uneven. Adding ink or ink remover to reduce the viscosity of the ink, in addition should pay attention to the impact of the ambient temperature.
6. The paper itself is uneven. Due to moisture and other reasons, the paper becomes uneven and the time for opening the paper is as short as possible. The environment (temperature and humidity) when opening the package should be consistent with the printing environment. Semi-finished products should be properly kept, preferably on a plastic hood. (To be continued)
1. The plate is loose. Due to the looseness of the printing plate, the position of the printing plate during the printing process cannot be kept constant, so that the positions of the new and old printing spots that are transferred to the printing material twice are not the same, and thus ghosting will appear on the printing sheet. Re-clamp the printing plate. The screws on the circumference and on both sides must be in working condition. This can keep the relative position of the printing plate's printing plate and the plate cylinder; the adjustment of the plate clearance on the printing plate ensures the printing process. The relative position of the printing plate and the printing plate is unchanged; the printing plate is pressed together so that the printing plate can be closely enclosed on the printing plate cylinder.
2. The blanket is loose. Since the blanket loosens in two different positions during the contact with the plate (or impression cylinder), both new and old marks are left on the blanket, and ghosting will inevitably occur upon transfer to the print. The position of the rubber clips on the rubber clips is not correct. Reinstall the cards to ensure that the blankets are in close contact with the plugs on the clips. Also, tighten the screws first and then tightly on the two sides to prevent the middle of the blanket from accumulating. The tension of the cloth is too small. The worm gear mechanism is used to tighten the blanket by the reporter's hand. The gasket that has fallen under the blanket is not even, resulting in a loose blanket in some places and a tight rubber blanket in some places. Replace the gasket.
3. The paper slides on the impression cylinder. When the printed sheet is printed in the first color and then enters the second color after the multicolor printing, since the printed sheet is not completely dried, the first color of the printed edge is transferred to the second when in contact with the second colored eraser. On a color blanket. If there is a change in the position of the paper and the other parts are in good working condition, the first color print on the subsequent print sheet should completely coincide with the first color print on the second color blanket because there is no ghost image; otherwise It will produce ghosting. The pressure of the die on the impression cylinder is too small to increase the pressure of the die. The pad on the impression roller wears badly and the pad is replaced. The pressure of the impression roller is too small to adjust the rules and increase the amount of bite paper. Printing pressure is too high to reduce printing pressure; ink viscosity is too large, add ink or ink remover to reduce the viscosity of the ink; full version thick, replaced by a soft liner.
4. The paper is deformed. The surface of the paper is not even, and the dampness of the paper will cause the old and new blots to not coincide. It is possible to use the machine to compress (Sheung Shui, but not ink) the paper, so that the paper is basically flat after it is imprinted. And because it already absorbs a certain amount of water, it is much less likely to reabsorb.
5. The roller's movement. Rolling of other transfer cylinders, such as plate cylinders, blanket cylinders, etc., will cause the old and new blots to not coincide and produce ghost images. Carefully inspect these roller axial eye position devices, improper re-adjustment, generally the amount of string is controlled within 0.03mm.
6. The layout of the layout is not reasonable. The field swapping and mesh blocks should be arranged correctly, and generally should be distributed as evenly as possible in the axial direction so that the viscous force of the ink is evenly distributed along the axial direction, thereby reducing the possibility of paper slipping.
7.9.3 Water, ink, and ink bars are water lines or lines of ink appearing on the axis (or horizontal). The waterline is caused by the fact that the water is not printed on the ink or printed too little; the ink line is caused by the large ink and the ink is printed too much. The causes of water and ink bars are numerous and complex. Below from a different point of view to briefly analyze the causes and exclusion methods.
1. The water pressure is too great. Because the pressure of the water roller is too large, the impact generated when the roller is in contact with the printing plate is also large, so that the amount of water on both sides of the impact point of the water roller is larger than the amount of water in other parts around it. After the water roller rotates one revolution, the large part of the water is in contact with the printing plate, so that the ability to ink at the place is weakened, thereby forming a water bar. The water roller pressure should be reduced at this time.
2. The water roller is not round. Because the water roller is not round, some places are high and some places are low. In places where it is high, it slides when it comes in contact with the plate, causing water to accumulate and form water bars. The water roller should be replaced.
3. The pressure of the ink roller is too high. The reason for this analysis is the same as 1, except that the amount of ink on both sides of the impact increases, thereby forming an ink stick.
4. The ink roller is not round. Its analysis is the same as 2.
5. Printing pressure is too high. As the printing pressure is too high, the impact of the drum when switching between the notch and the non-notch is too large, resulting in vibration of the drum, so that the water, ink roller and the surface of the plate cylinder also produce impact, thereby producing water and ink bars. The solution is to reduce the printing pressure.
6. Roller gear wear or machining accuracy is too low. After the accuracy of the gear is destroyed, unevenness occurs in the rotation of the drum, which causes relative slippage between the water, the ink roller and the printing plate, forming water and ink society. At this point should replace the freighter or change the meshing position of the gear.
Once the water and ink bars appear, the consequences are very serious. Therefore, the causes must be identified in a timely manner and be eliminated.
7.9.4 Paper Folding Paper Folding means that the surface of the paper is not horizontal, so that when it is printed, the protruding area is flattened to form pleats. Prints with pleats are generally unacceptable.
1. The paper is not flat at the rules. Because the paper is in an irregular state at the rules, when printing is performed, the irregularities are flattened to form a grid.
(1) Change the position and direction of the pressure roller on the paper feeder to make it easier for the paper to be flat.
(2) Increase the number of front gauges so that the paper does not bend forward in the rules.
(3) For the pendulum-type transfer paper teeth, the distance between the teeth and the rule weight should be equal to or slightly lower than the distance between the front cap and the rule plate.
2. There is a half tooth phenomenon in the gripper. When the gripper teeth are half-toothed, the paper can easily slide inside the tusks, thus causing the surface of the paper to become uneven and forming pleats during printing. Try to think of ways to bite paper on two-thirds or more of the cavities in the width direction.
3. Handing paper is more uneven, more on one side and less on one side. The lesser side is prone to slip during delivery, resulting in unevenness of the paper surface. Adjust the rules so that the amount of paper gripper can meet the requirements of the paper does not slide.
4. Printing pressure is too high. Due to the high printing pressure, the papers at the individual cavities appear to slide relative to each other, causing the paper surface to be uneven. Reduce the printing pressure or increase the friction of the impression cylinder gripper.
5. The ink is too sticky. Due to the stickiness of the ink, the resistance to the forward conveyance of the paper increases, so that the individual parts of the paper slide back and the surface of the paper becomes uneven. Adding ink or ink remover to reduce the viscosity of the ink, in addition should pay attention to the impact of the ambient temperature.
6. The paper itself is uneven. Due to moisture and other reasons, the paper becomes uneven and the time for opening the paper is as short as possible. The environment (temperature and humidity) when opening the package should be consistent with the printing environment. Semi-finished products should be properly kept, preferably on a plastic hood. (To be continued)
Pet bags or carriers in different material, such as fabric, plastic, or on wheels are getting popularity around the world. Sometimes dogs are required to be carried in carriers on public transportation or just easier to bring your dogs around to keep them calm in new or loud environment.
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PERCELL PET is established in 1978 with offices located in Taipei, Taiwan and Guangdong, China. Currently, Percell Pet partners with more than 49 distributors around the world and carries thousands of quality pet supplies for dogs, cats, birds, fresh and salt water fishes, reptiles and small animals, like rabbits and ferrets, etc from Taiwan and China.
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