The following are the typical thick stick analysis for the
china printing. You can learn something from it I am sure.
The first: gear wheel thick stick. Trouble phenomenon: the whole cover has the thick sticks and the regular one is the ink thick sticks. The reason: the make and installation of the gear wheel is not good. The solving way: properly reduce the gap for the gear wheel center distance or the backlash; change the roller cylinder packing into the soft pad to increase the flexibility of the cylinder packing. If the situation is serious, you should go to change for a new gear wheel.
The second: librating thick stick. Trouble phenomenon: some of the print has the thick stick and the position is certain, the regular is the ink thick stick. The reason: there is some unbalance for the offset printing press. The solving way: check the machine moving situation and change the improper parts for it according to the concrete situation of the thick stick.
The third: roller thick stick. Trouble phenomenon: the thick stick is wider and the position is not certain and the color is not in unity. The reason: the ink distribution system design is not good or the roller press cannot be coordinated well.
The fourth: the thick stick caused by other reasons. The rubber clothing is one of the fourth. If the rubber clothing is loose, when press and print, the slippage will cause the thick stick. In order to avoid the thick stick, we should choose the better rubber clothing. The other is that if we choose the hard pad, although the net point is very clear and the arrangement is good for us, but for the machine, it can cause the thick stick. The next is the block and the paper, the last is the ink for us. For all the above, we should take care for avoiding the thick stick when we are doing the china printing.
Resources : http://www.zrhprint.com/blog/2010/09/typical-thick-stick-analysis/
