Causes and elimination of the ink bar printed on the disc
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The ink color of the horizontal strip bar portion appearing on the printed matter surface is obviously deeper than the ink color of other parts belongs to the ink bar, and the cause and elimination method of generating the ink stick are as follows:
1. The ink bar caused by the brake bar. When the contact pressure between the rubber roller and the brake bar is too large, then when the ink roller contacts the brake bar during the running of the machine, impact wear occurs. For this, the contact pressure between the rubber roller and the printing plate should be adjusted to maintain uniformity. Moderate contact conditions, after eliminating excessive resistance, the ink bar can be better eliminated. Replace the front end with a section of approximately 40 mm when the brake bar is severely worn.
2. The rubber roller caused by the rubber roller factor. When the contact pressure between the rubber roller and the printing plate is too large, when the ink roller is in contact with the printing plate during the operation of the machine, the impact is easily generated and the tremor is caused, so that the frictional force increases the streaks. If the pressure of several inking rollers is too large, the density of the bar marks will be greater. In this regard, the contact pressure between the rubber roller and the printing plate should be adjusted to maintain uniform and moderate contact conditions, and the ink bar can be better eliminated after eliminating excessive resistance.
3. The roller gear is worn, the gear gap is too large, or foreign matter accumulates between the gears. When the drum gear wears, the gap or the foreign matter adheres between the teeth, during the operation of the machine, the drum gears cannot be precisely meshed, so that the linear speed between the rollers is not consistent. In addition, the backlash is too large, and the drum is also prone to chattering and shaking, forming a printed bar mark, causing a trace of the ink stick that is similar to the gear pitch. There is a foreign matter obstacle in the backlash, and it is easy to cause the drum to tremble due to the phenomenon of "top teeth", so that the horizontal layout of the printed product forms a strip of ink stick. In this regard, the center distance between the rollers should be re-adjusted to reduce the gap between the teeth; for gears with severe wear, the new gear should be replaced; if there is a foreign matter adhered between the teeth, it should be cleaned to achieve the effect of eliminating the ink stick.
4. The roller bearing has a large wear. When the roller shaft head is running out of oil or the machine wears natural wear for a long period of time, the gap between the roller shaft head and the bearing is increased, and the mismatching is caused, and the ink stick trace is caused by the chattering when the pressure is combined. In this regard, it is advisable to make the rubber inner liner into a trapezoidal shape to reduce the impact during the imprinting state and to reduce the degree of the ink stick. In addition, if the roller bearing is seriously worn, it should be considered to repair or replace the new bearing to eliminate the ink trace.
5. The plate cylinder or rubber roller package lining is too large. If these two conditions exist, the strip-shaped ink stick marks will be caused by the inconsistent surface linear velocity, and the impact vibrating of the drum will also occur due to the embossing, so that the contact between the two rollers is likely to cause friction and cause the ink stick trace when the vibration occurs. In addition, sometimes the ink stick is easily caused by the fact that the imprinting of the bite portion is not obvious (the pressure is light) and the pad of the pad is too much. In this regard, the thickness of the lining should be accurately adjusted, and the minimum printing pressure should be used to make the ink layer uniformly transfer, so as to maintain the uniform line speed between the rollers as a prerequisite. When adding a paper strip to the bite area, the method should be carried out by gradually heating the mat. Do not pad more at once to avoid the occurrence of ink stick marks.
6. Blanket (blanket) is loose, sliding friction is easy to produce when rolling, so there are strips of ink traces. Therefore, measures should be taken in time to tighten to prevent the printing of ink sticks.
7. When the self-adhesive Blanket is replaced, the old primer is not cleaned, and the partial pressure is inconsistent, causing the ink stick trace.
For screen printing, the 165-27Y PW mesh for four-color printing for CD-printing peers. The biggest advantage is that the color will be darker. (Printing surface, full color will be better, and Chinese people I prefer bright colors. Because there are a lot of proofs that are inkjet printed, I know that this kind of mesh is used less in the same industry. It is usually 31 wire diameter. When it is lighter, it is normal. The treatment method is to increase the thickness of the photosensitive layer, adjust the adjustment on the machine such as soft rubber scraping, and to adjust the color of the four-color ink. I think it is necessary to add the theoretical value of the offset printing of the net, the conventional 300 pieces, and the single run of 2000 is enough. For example, if the color becomes darker, the ink parameters are less adjusted. Every 100 sheets are checked once. There are signs of darkening. Add one or two parameters, and then check the color of 200 pieces. If you still add it, this is your own way. Flexible processing, if the first parameter is properly adjusted, I believe that the color will not change much. (The parameters determined according to the size of the printing layout) The ink supply balance is very important. I need experience. I don't agree to adjust the gap of the ink tank. What to do next order, whether to make old orders, no horizontal glue The most important thing is the management and maintenance of the equipment. The most prone to problems in offset printing is the color control. The color changes depending on the specific situation. The test machine does not run enough. It should be more stable in more than 1000 colors. The change of the cooling temperature of the ink table, the ink supply balance, the turntable, the pressure, the blanket, and the offset printing are the overall coordination of these aspects. In the case of good mechanical properties of the offset printing machine, it is not recommended to transfer the machine. The problem is likely to be In the test machine, the experience is not enough, the ink supply parameters are not adjusted well, even after the adjustment, you need to make some fine-tuning according to the color change at any time (the color change is not big),the printing of 50,000 orders is almost invisible to the naked eye.