1. Ink bars caused by brake strips. When the contact pressure between the rubber roller and the brake strip is too large, then when the ink roller is in contact with the brake strip during the operation of the machine, impact wear will occur. For this, the contact pressure between the rubber roller and the printing plate should be adjusted to maintain uniformity 1. Moderate contact conditions, after removing excessive resistance, the ink bar can be better eliminated. When the brake bar is badly worn, replace a section of about 40mm at the front end.
2. Ink stick caused by rubber roller. When the contact pressure between the rubber roller and the printing plate is too large, then when the ink roller and the printing plate are in contact with the roller brush during the operation of the machine, it is easy to produce shock and cause tremor, so that the increased friction causes streaking. If the pressure of several inking rollers by the format is too large, the density of the streak 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. After removing excessive resistance, the ink bar can be better eliminated.
3. The roller gear is worn, the gear gap is too large, or there is foreign matter accumulation between the gears. When the roller gears are worn, or there is adhesion of foreign objects between the teeth, during the operation of the machine, the roller gears cannot be accurately meshed, so that the linear speed between the rollers is not consistent. In addition, if the tooth gap is too large, the cylinder is also prone to tremor and jitter, forming printed bar marks, so that there are ink bar marks on the printed board surface that are close to the gear pitch. There is a foreign object obstacle in the tooth gap, and it is easy to cause the roller to tremble due to the "top tooth" phenomenon, so that the horizontal layout of the printed product forms a strip-shaped ink bar. In this regard, the center distance between the rollers should be readjusted to reduce the gap between the teeth; the gears with severe wear should be replaced with new gears; the adhesion of foreign objects between the teeth should be cleaned to achieve the effect of eliminating ink sticks.
4. The roller bearing has large wear. When the roller shaft head runs short of oil or the machine wears naturally for a long time, the gap between the roller shaft head and the bearing is increased, the cooperation is poor, and the ink stick marks are caused by vibration when the pressure is combined. In this regard, it is advisable to make the grip of the rubber inner liner trapezoidal to reduce the impact during the imprinted state and reduce the degree of ink stick marks. In addition, if the roller bearing is seriously worn, it should be considered to repair or replace the new bearing to eliminate the traces of ink sticks.
5. The printing plate cylinder or rubber cylinder is too large. If these two conditions exist, the stripe ink stick marks will be caused by the inconsistent linear velocity on their surface. At the same time, due to the impact vibration of the cylinder during imprinting, the friction between the two cylinders during vibration will easily cause friction and cause ink marks. In addition, because the imprint on the bite part is not obvious (the pressure is light), if the pad is too much, it may also cause ink sticks. In this regard, the thickness of the liner should be accurately adjusted, and the minimum printing pressure should be used as far as possible to make the ink layer transfer evenly, so as to maintain the consistency of the surface linear speed between the rollers as a prerequisite. When adding paper strips to the bite area, the method of gradually heating the pad should be used. Do not pad more than one at a time to avoid ink stick marks.
6. Blanket (rubber cloth) is loose, and it is easy to produce sliding friction when rolling, so there are traces of ink sticks. Therefore, measures should be taken in time for tightening to prevent printing ink sticks.
7. When the self-adhesive Blanket (rubber cloth) is replaced, the old primer has not been cleaned, and the local pressure is inconsistent, causing ink stick marks.
For screen printing, I recommend using 165-27Y PW mesh for four-color printing for colleagues in CD printing.Its biggest advantage is that the color will be darker. (Printed disc surface, full color will be more beautiful, and Chinese I prefer bright colors), because there are many proofs that are printed by inkjet, I understand that this kind of mesh fabric is less used in the industry, usually 31-diameter, when it is lighter, the general The processing method is to increase the thickness of the photosensitive layer, change the adjustment on the machine such as soft rubber squeegee, and adjust the four-color ink. I think that the theoretical value of the mesh offset printing needs to be added. Conventional 300 pieces and 2000 single-run 50 pieces are enough. For example, the color becomes darker, and the ink staining parameters are adjusted a little less.Check once every 100 sheets.If there are signs of darkening, add one or two parameters, and then check the color of 200 pieces.If it is still, add it again, this is my own way. Flexible handling, if the first parameter is adjusted properly, I believe that the color will not change much, (the parameter determined by the size of the printing plate) The ink supply balance is very important, and I need experience. I do not agree to adjust the gap of the ink tank. What to do with the next order, do you need to transfer it back to the old one, and the non-horizontal version is the best In the management and maintenance of equipment, the most prone to problems with offset printing is the color control.The color changes depend on the specific circumstances as follows: the test piece does not run enough, and the color should be more stable when it is more than 1000 pieces. Changes in the cooling temperature of the ink table, ink supply balance, turntable, pressure, blanket, offset printing are the overall coordination of these aspects.In the case of good mechanical performance of the offset printing machine, it is not recommended to mobilize the machine.The problem may be due to When testing the machine, the experience is not enough, the ink supply parameters are not adjusted well, even after the adjustment, you still need to make some fine-tuning at any time according to the color change, (the case of little color change), I have done seven factories, here I , Printing 50,000 lists, almost naked to see the difference.
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