The author once encountered a case where the imprinting fails and the cause of the malfunction is rather special and difficult to find. It is time-consuming and labor-consuming to solve, but it has a certain representativeness.
The equipment used is the YPSIAICC type BB type double-sided offset press produced by Jiangsu Changsheng Group. According to the operator, the device has been used for two years, and the imprinting has been inferior to the original version, and the work can only be performed when the pressure between the rollers is high (reaching 13 to 14 mm). After replacing the blanket slightly better, but after a period of use,
The imprint has become imaginary again and had to add a pad of paper to the counterprinting roller. And generally less than a month anti-printing blanket scrapped, blanket consumption is serious. The surface of the removed blanket has a crack-like pattern, which is obviously caused by excessive pressure.
Troubleshooting process
1. According to the arrangement of the ink roller, reinstall and debug the ink roller, replace the problematic ink roller and the idler gear, check the ink roller, water roller, and printing plate in the state of pressure, and the contact is good. That is, the printing plate is inked and the upper water is normal.
2. It is suspected that the cloth is poor in leveling, affecting the printing of the blot, and the counterprinted rubber roller pad is changed from a soft lining to a hard lining, that is, the original two sheets of 100 g/m2 offset paper are added to the cloth, and 11 is changed to 11 100g/m2 offset paper with a total lining thickness of 3.07mm. Check the pressure between the rollers (indicated by a pressure bar):
P version - B rubber is 12mm, B rubber - B rubber is 15mm
Under this pressure test, the anti-printing is still not true.
3. After the replacement of the new blanket, the imprint was still empty.
4. It is suspected that there is a problem with the sleeve. Open the shield. Under pressure, the shaft sleeve is normal.
5. After analysis, the pressure between B rubber-B rubber is as high as 15 to 16 mm. Obviously, the pressure is too large, which makes the elasticity of the blanket lags behind and weakens, that is, the instantaneous compression deformation performance is reduced, so that the plate-to-rubber cloth does not have reliable contact with the paper. , resulting in poor transfer effect. Reduce the lining, that is, reduce the pressure test, imprint or hair.
6. Observed when the machine was stopped, the printing plate was well inked, and the remaining ink layer on the blanket was also very thick. Using a blank sheet of paper to press the mark on the blanket, the mark on the white paper was very clear. It appeared that the problem was in the transfer pressure. . The pressure of the equipment is too large between the drums under the standard package, which means that the center distance of the rollers is small, and the meshed gears are too tight after pressure is applied, which affects the pressure. Therefore, the anti-print pressure bar was shortened to increase the center distance of the roller, and both sides of the roller were adjusted in accordance with the pressure bar method, and the genuine pressure was also readjusted. The anti-plate pressure P plate-B rubber is 8mm, B rubber-B rubber is 10mm, and the genuine pressure P plate-B rubber is 9mm. After a power-on test, the imprinting of the reversed version becomes clear and the ink layer is thick, which is the same as the genuine effect.
Failure analysis
The direct cause of this fault is that the pressure rod is adjusted to be long, and the gear meshes after the pressure is too tight. The roller is driven by gears. On the one hand, the pressure between the rollers is borne by the gears. On the other hand, due to the influence of gear machining accuracy and dirt on the surface of the gears, the force acting on the gears is too large, making the roller pressure unstable and affecting the footprint. The normal transfer causes the imprint to fail. When the pressure is high, the elasticity of the blanket will be reduced for a certain period of time, and the liner will have to be increased. Such a vicious circle will cause the blanket to be scrapped in advance.
By adjusting the equipment, blankets greatly extend the life savings of nearly 2,000 yuan per year, and the print quality is assured Author: Huyong Min
The equipment used is the YPSIAICC type BB type double-sided offset press produced by Jiangsu Changsheng Group. According to the operator, the device has been used for two years, and the imprinting has been inferior to the original version, and the work can only be performed when the pressure between the rollers is high (reaching 13 to 14 mm). After replacing the blanket slightly better, but after a period of use,
The imprint has become imaginary again and had to add a pad of paper to the counterprinting roller. And generally less than a month anti-printing blanket scrapped, blanket consumption is serious. The surface of the removed blanket has a crack-like pattern, which is obviously caused by excessive pressure.
Troubleshooting process
1. According to the arrangement of the ink roller, reinstall and debug the ink roller, replace the problematic ink roller and the idler gear, check the ink roller, water roller, and printing plate in the state of pressure, and the contact is good. That is, the printing plate is inked and the upper water is normal.
2. It is suspected that the cloth is poor in leveling, affecting the printing of the blot, and the counterprinted rubber roller pad is changed from a soft lining to a hard lining, that is, the original two sheets of 100 g/m2 offset paper are added to the cloth, and 11 is changed to 11 100g/m2 offset paper with a total lining thickness of 3.07mm. Check the pressure between the rollers (indicated by a pressure bar):
P version - B rubber is 12mm, B rubber - B rubber is 15mm
Under this pressure test, the anti-printing is still not true.
3. After the replacement of the new blanket, the imprint was still empty.
4. It is suspected that there is a problem with the sleeve. Open the shield. Under pressure, the shaft sleeve is normal.
5. After analysis, the pressure between B rubber-B rubber is as high as 15 to 16 mm. Obviously, the pressure is too large, which makes the elasticity of the blanket lags behind and weakens, that is, the instantaneous compression deformation performance is reduced, so that the plate-to-rubber cloth does not have reliable contact with the paper. , resulting in poor transfer effect. Reduce the lining, that is, reduce the pressure test, imprint or hair.
6. Observed when the machine was stopped, the printing plate was well inked, and the remaining ink layer on the blanket was also very thick. Using a blank sheet of paper to press the mark on the blanket, the mark on the white paper was very clear. It appeared that the problem was in the transfer pressure. . The pressure of the equipment is too large between the drums under the standard package, which means that the center distance of the rollers is small, and the meshed gears are too tight after pressure is applied, which affects the pressure. Therefore, the anti-print pressure bar was shortened to increase the center distance of the roller, and both sides of the roller were adjusted in accordance with the pressure bar method, and the genuine pressure was also readjusted. The anti-plate pressure P plate-B rubber is 8mm, B rubber-B rubber is 10mm, and the genuine pressure P plate-B rubber is 9mm. After a power-on test, the imprinting of the reversed version becomes clear and the ink layer is thick, which is the same as the genuine effect.
Failure analysis
The direct cause of this fault is that the pressure rod is adjusted to be long, and the gear meshes after the pressure is too tight. The roller is driven by gears. On the one hand, the pressure between the rollers is borne by the gears. On the other hand, due to the influence of gear machining accuracy and dirt on the surface of the gears, the force acting on the gears is too large, making the roller pressure unstable and affecting the footprint. The normal transfer causes the imprint to fail. When the pressure is high, the elasticity of the blanket will be reduced for a certain period of time, and the liner will have to be increased. Such a vicious circle will cause the blanket to be scrapped in advance.
By adjusting the equipment, blankets greatly extend the life savings of nearly 2,000 yuan per year, and the print quality is assured Author: Huyong Min
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