How to solve the ink bar problem in flexo printing

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How to solve the ink bar problem in flexo printing

how to solve the ink bar problem in flexo printing

does the printer have an ink scraper? Is it dark ink bar or light ink bar? I have the same problem. If the corrugated roller is not equipped with an ink scraper, first check the roundness of the rubber roller, and the wear degree of the rubber roller gear and bearing; If there is a doctor blade, check the wrinkle roll first. The oscillation of the machine will also produce the ink rod

the machine foot we use is Heidelberg gallus 410. The corrugated roller, stainless steel doctor blade and the machine are new, and there is no vibration problem. The color of printed matter is dark and light, especially the dark blue field

your problem is probably caused by gear meshing. That is, the toothed bar. The gear bar is easy to appear when the machine speed is low. In 1920, it should be said that the gallus machine was meshed with helical gears, and there was little chance of the occurrence of gear bars. As far as I know, helical gears have no ink bars when it is convenient to obtain experimental data of various materials at high speed. However, at low speed, ink bars are easier to produce than straight teeth, and it is difficult to eliminate ink bars by changing the meshing relationship of gears. You can try to see if there is ink bar when the speed is 80~90m/min. Then make a judgment

at least you say it is obvious when printing dark blue field. In fact, it is not the different printing colors that lead to different ink bar sizes. There is a saying in the printing industry that "blue ink does not cover up the ugliness", that is to say, when printing, the slightest problem with blue ink will look very ugly. So is green ink

we used two sets of plate rollers, 164 teeth and 159 teeth, when printing the same product. With 159 teeth, there is no ink bar, and 164 teeth. What's going on

this should be explained in two ways:

I. are the pictures and texts printed by the two sets of plate rollers similar? If your product is the same, but different version rollers are used, the number of teeth of the version roller must be more in the neutral position of the version mouth. For example, if you print the Red River soft bag, 159 teeth can be completely wrapped for one week, and the neutral position of the plate mouth may be only a little, such as l0mm. When you use the 164 tooth plate roller, your neutral gear becomes 10+3.175 × (16+.9)=25.8m。 When the version roller rotates for one cycle, the time in neutral gear will be more than twice as long as the former. To know that more than this neutral gear, version roll rotation may be unstable, and it is not surprising that ink bars are generated. Solution: 1. Bold the balance line: 2. Paste the field cut from the waste plate on the neutral position to balance the vibration generated by the rotation of the plate roller; 3. Don't put too much pressure

2. If the pictures and texts printed by two sets of plate rollers are different, you should first eliminate the first reason. Secondly, you can observe whether the ink bar is generated when your cross cutting blade contacts the bottom roll. If so, the ink bar must be caused by the vibration of the cross cutting knife. This kind of vibration has a great influence when the machine speed is low. Solution: 1. Lower the blade of the crosscutting knife to just cut off the paper without causing vibration. This requires a little patience and skill; 2. Increase the speed of the machine, and there must be no ink bar above l00m/min; 3. Change the route of the printed paper through the paper, so that when the cross cutting knife is cut, the plate mouth on the plate roller is just at the combination position of printing, that is, it is not given the opportunity to generate ink bars, which is called "knife saving bars"

I don't think it is reasonable to say that the vibration of the die-cutting blade roller produces ink bars. The position of the die-cutting knife is more than five meters away from the position of the printing unit that produces the ink bar, and our machine has a rotating wire, which can only be opened to 60m/min at most

ink bars produced by die cutting (or stretch cutting) have been proved in production. The phenomenon is that there is only one or at most two obvious ink bars on a printing perimeter. As for the interval of five meters, if the speed is low and the vibration of the knife is large, it will certainly have an impact

bearing damage can also produce ink bars. What I want to ask is what kind of ink bar is caused by bearing damage? Which type of bearing is best used in flexo printing machine

bearing wear or damage is also an important cause of ink bar. General through spindle flexo printing machine, version roller bearings are ball bearings, there is no special requirements. The integral layout of flexo printing machine version roller bearings are generally needle bearings. At present, most of the imported flexo printing machines are of the through mandrel type, and the roller bearings are not easy to be damaged. The bearing mentioned by brother upstairs may refer to the pressure regulating bearing in the clutch mechanism of flexo press. It is generally autumn shaped bearing, which is easy to be damaged. A little wear will produce serious ink bars

the machine I use is an old-fashioned Flexo machine. The embossing roller does not have a doctor blade; Ink volume is controlled by the extrusion of rubber roller and corrugated roller. Recently, ink bars often appear. It is very obvious when driving at low speed, but the high speed can be divided into: function test fatigue experiment, influence coefficient fatigue experiment, control fatigue experiment, selection fatigue experiment, verification fatigue experiment, etc. the ink bar phenomenon is not obvious because the ink volume will automatically increase when driving. For this old machine, is the damage of COTS the main cause of ink bars

ABS engineering plastic is used as the material of the corrugated roller gear and the plate roller gear. Then divide the gear into two parts, clamp open a little (the specific staggering is related to the gear module) and lock the separated gears with screws to eliminate the gear transmission clearance, so as to eliminate the gear rod

according to what you said, the ink bar should be caused by uneven rubber rollers. The solution is to take the cots and turn them over. It is better to use self-aligning bearings for rubber rollers, such as 1204, 1205, 1206, etc

the ink bar is mainly caused by the improper or non parallel pressure of the wrinkle roll, the plate roll and the imprint roll, which can be solved by adjusting with a feeler gauge

can an ink bar be generated by the embossing roller? During the printing process, the ink bar appears in the middle of the plate, eliminating the accuracy defect of the plate roller and the pressure position if the oil pipe is broken. The equipment is mcandish 4150

the corrugated roller will not produce ink bars (the machine is free from vibration and gear damage). Gear accuracy problems will produce gear bars. It is necessary to distinguish between ink bars and gear bars

the ink bar will not be generated by the corrugated roller. You can look at the difference between the diameter of the corrugated roller and the diameter of the cylinder. Try changing a cylinder with a smaller diameter. Another look at the viscosity of the ink. If the viscosity is too high, it can be diluted

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