Printability differences sheetfed offset printing machines of large, Bo Hou different paper paper collection problems occur during printing device different graphic information are different, this article, the author focuses on delivery of Common Troubles and solutions for Peer reference.
The print on the surface of the take-up reel is dirty
1. Anti-smash treatment method
(1) Adjusting the position of the star wheel
The domestic offset printing machine generally adopts a skeleton-type delivery roller, and has a simple structure. By adjusting the position of the star wheel, most of the printed products can be prevented from being dirty, and the manufacturing cost is relatively low. This method is generally suitable for black and white or relatively simple color prints to prevent smashing.
(2) Anti-mite cloth / anti-smudge paper (glass ball sandpaper)
A tamper-proof cloth can be installed on the surface of the flat take-up reel, such as Heidelberg's special super blue cloth. The surface structure can reduce the contact area with the paper and cushion the shock absorption to achieve the purpose of preventing smashing; On some Japanese offset presses, you can manually put anti-smudge paper (glass ball sandpaper), relying on the sharp points on the surface of the glass ball sandpaper to hold up the surface of the print, so as to prevent smudging, but after using the glass ball sandpaper for a long time, The ink gradually fills the gap between the sphere and the surface of the sphere, making it lose its anti-smashing effect. Therefore, depending on the application, it is recommended to scrub it once a day to extend the life. It should be noted that whether it is super blue cloth or anti-smudge paper, after a certain period of time, the anti-smudge effect will be reduced and it needs to be replaced regularly.
(3) Anti-sludge air cushion roller
The anti-smashing air cushion cylinder belongs to the patented technology of Roland offset printing machine, which is easy to operate and can last for a long time. However, due to the high manufacturing cost, only high-end models have this feature, or you need to purchase this feature when purchasing equipment.
2. Pickup roller surface cleaning method
Regardless of the type of anti-smashing device, it is necessary to regularly clean and scrub the surface to ensure that the surface is clean and there are no ink bumps. It is recommended that the operator scrub the surface of the delivery roller or use a wind gun to wash the tamper every day after work. Dirty cloth.
Paper reducer (brake roller) does not have enough air intake
1. The overall deceleration effect is poor
(1) Fault phenomenon
When the paper reaches the stack, it curls forward and collides with the front paper stopper. The curling and tearing of the crevice occurs. Adjust the suction volume of the delivery reducer and adjust the angle of the open cam to change the arrival of the paper. After morning and evening time, the effect is still not good, and it is basically determined that the reducer has insufficient air intake.
(2) Solution
First check whether the external suction filter of the reducer air pump accumulates a large amount of dust and debris, and then check whether the built-in filter of the reducer has a large amount of dust, the air filter device sucked by the air pump and the dust sprayed when the reducer is working. The filter device is inspected and cleaned to determine that the speed reducer is normal. Under this premise, increase the intake of the reducer and eliminate the fault.
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