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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.
Question: We used two sets of plate rollers, 164 teeth and 159 teeth, when printing the same product. With the 159 tooth plate roller, there is no ink bar, and there are 164 teeth. What's going on?
Answer: This should be explained in two simple cases:
1. Are the pictures printed by the two sets of plate rollers the same? If your products are the same, but only with different plate rollers, the plate rollers with a large number of teeth will inevitably have more gaps in the plate position. For example, the Honghe soft bag you printed, 159 teeth can be completely wrapped for a week, and the empty position of the plate mouth may be only a little, such as l0mm. When you use a 164-toothed roller, your neutral position becomes 10 + 3.175 × (16 + 4-15.9) = 25.8m. Then, when the plate roller rotates once, the time in the neutral position will be more than twice that of the former. To know that there is more of this neutral gear, the rotation of the plate roller may be unstable, and it is not surprising that the ink stick is generated.
Solution:
1. Bold balance line;
2. Paste the ground cut from the scrap plate at the neutral position to balance the vibration of the plate roller during rotation;
3. The pressure should not be too big.
2. If the pictures printed by the two sets of plate rollers are not the same, you must first eliminate the first reason. Secondly, you can observe whether your cross cutter blade is in contact with the bottom roller when it is time to produce ink sticks. If it is, then the cause of the ink stick must be due to the vibration of the cross cutter. The impact of this vibration is very large when the machine speed is low.
Solution:
1. Turn down the blade of the cross-cutting knife, it is better to just cut the paper, or it is better to produce vibration, which may require a little patience and skill;
2. Increase the speed of the machine, there must be no ink bar above l00m / min;
3. When the printed paper is routed through the paper and the cross-cutting knife is cut off, the plate opening on the plate roller is just at the combined position of printing, that is, it is not given the opportunity to produce ink sticks, we call it " Save the bar ".
I think the argument that the die cutter roll vibrates to produce ink sticks may not make sense. The position of the die cutter and the position of the printing unit that produces the ink bar are more than five meters apart, and our machine has a rotary screen, which can only be opened up to 60m / min.
Die cut (or Zhang cut) to produce ink stick has been confirmed in production. The phenomenon is that there is only one or at most two obvious ink bars on a printing perimeter. As for the five-meter interval you mentioned, if the speed of the vehicle is low and the vibration of the knife is large, it will definitely have an impact.
Question: Damaged bearings can also produce ink sticks. What I want to ask is what kind of ink bar is produced by bearing damage? Which type of bearing is best for flexo printing machine?
Bearing wear or damage is also an important cause of ink sticks. In general flexo printing machines with mandrel type, the roller bearings are all ball bearings, and there are no special requirements. The roller bearing of the flexo printing machine of the overall installation format generally uses needle bearings. At present, most of the imported flexo printing machines are through-spindle type, and the plate roller bearing is not easy to be damaged. The bearing mentioned by the brothers upstairs may refer to the pressure regulating bearing in the clutch pressure mechanism of the flexo printing machine. It is generally an autumn bearing, which is easily damaged, and a little wear will cause serious ink sticks.
Q: The machine I use is an old-fashioned flexo machine. The anilox roller does not have a squeegee; the amount of ink is controlled by the squeeze of the rubber roller and the anilox roller, and ink sticks often appear recently. It is very obvious when driving at a low speed, and the ink volume will automatically increase when driving at a high speed, making the ink stick phenomenon less obvious. For this old-fashioned machine, is the damage of the rubber roller the main reason for the ink stick?
Answer: ABS engineering plastic is used as the material of the anilox roller gear and the plate roller gear. Then divide the gear into two, and open the pincers a little bit (the specific deviation is related to the modulus of the gear). Use screws to lock the separated gears to eliminate the gear transmission gap, thereby eliminating the rack.
According to what you said, the ink bar should be caused by uneven rubber rollers. The solution is to take the rubber roller and grind it. The rubber roller is best to use self-aligning bearings, such as: 1204, 1205, 1206, etc.
The ink bar is mainly caused by the inappropriate or non-parallel pressure of the anilox roller, plate roller and impression roller, which can be solved by adjusting with a feeler gauge.
Q: Can the anilox roller produce ink sticks? In the middle of the printing surface, ink bars appear in the printing process to eliminate the accuracy defects and pressure positions of the plate roller. The equipment is McAndy 4150.
Answer: The anilox roller will not produce ink sticks (the machine has no vibration and gear damage). Gear accuracy problems will produce racks, to distinguish between ink racks and racks.
The anilox roller does not produce ink sticks. You can look at the difference between the diameter of the anilox roller and the diameter of the plate cylinder. Try a new plate cylinder with a smaller diameter. Also look at the viscosity of the ink. If the viscosity is too high, it can be thinned.
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