Q: How to solve the ink stick problem in flexo printing? The machine we use is Heidelberg GALLUS410. The anilox roller, stainless steel doctor blade and machine are new and there are no vibration problems. The color of the printed matter is darker and lighter, especially the dark blue solid ground.
Answer: Does the printing machine have a doctor blade? Is it a dark ink bar or a light ink bar? I also encountered the same problem. If the anilox roller does not have a doctor blade, you can first check the roundness of the rubber roller, the degree of wear of the rubber roller gear and the bearing; if you have the doctor blade, you should first check the anilox roller. Machine vibration will also produce ink sticks.
Your problem is probably caused by gear meshing. That is the rack. It is very easy to occur when the speed of the rack machine is low. It should be said that the GALLUS machine is meshed with helical gears, and the chance of racking is small. As far as I know, helical gears certainly do not have ink sticks at high speeds, but at low speeds, it is easier to produce ink sticks than straight teeth, and it is difficult to eliminate ink sticks by changing the meshing relationship of the gears. You can try it to see if there are ink sticks at a speed of 80 ~ 90m / min. Then make a judgment.
At least you say that printing dark blue is obvious on the ground. In fact, it is not that the printing color is different, the size of the ink bar will be different. There is a saying in the printing industry that "blue ink does not cover the ugliness", which means that when printing, the blue ink will look ugly if there are some problems. The same is true for green ink.
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