Production and Elimination of Printed Area Marker

The ink in the horizontal strips of the print layout appears to be darker than the ink in other areas. The cause and elimination of the ink strips are as follows:

1. The brake lever caused by the ink bar. When the contact pressure between the rubber roller and the brake bar is too large, the impact abrasion occurs when the ink roller contacts the brake bar during the operation of the machine. In this regard, the contact pressure between the rubber roller and the printing plate should be adjusted to maintain uniformity. Moderate contact conditions, eliminate excessive resistance, the ink bar can be better eliminated. When the brake shoe wears badly, replace the front end with a section of about 40 mm.

2. The ink bar 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 contacts with the printing plate during the operation of the machine, it is easy to generate shock and cause tremor, so that the increase of the frictional force causes a streaky streak. If several stencil-type ink fountain rollers are under too much pressure, the density of the bar marks will be greater. In this regard, by adjusting the contact pressure between the rubber roller and the printing plate, and maintaining a uniform and moderate contact condition, eliminating the excess resistance, the ink bars can be eliminated.

3. The roller gear is worn, the gear clearance is too large, or foreign matter accumulates between the gears. When the roller gear wears, gaps or adhesion of foreign matter in the teeth, during the operation of the machine, the roller gears can not be meshed with each other accurately, so that the line speed between the rollers is not consistent enough. In addition, the backlash is too large, the drum is also prone to tremor jitter, the formation of print marks, so that the printed layout of the track and the gear pitch similar to the ink marks. There is a foreign body obstacle in the backlash, and it is easy to cause the drum to tremble due to the "top gear" phenomenon, so that the horizontal layout of the print product forms a strip-like ink stick. In this regard, the distance between the rollers should be reduced by re-adjusting the center-to-center distance between the rollers; new gears should be replaced for those gears that are worn out badly; the adhesion of foreign materials to the teeth should be cleaned before the effect of eliminating ink bars can be achieved.

4. The roller bearing wears heavily. When the roller shaft head lacks oil running or the machine wears naturally for a long time, the gap between the roller shaft head and the bearing is increased, and the cooperation is poor, and the ink mark is caused by the tremor when the pressure is combined. In this regard, it is advisable to make trapezoidal traps in the inner liner of the rubber in order to reduce the impact during the imprinting state and reduce the degree of ink bar marks. In addition, serious wear on the roller bearings should be considered to take repair or replace the new bearing replacement to eliminate the traces of ink marks.

5. The plate cylinder or blanket cylinder liner is too large. Due to the inconsistency of their surface line speeds, strips of ink marks are caused, and at the same time, the rollers are subjected to shock vibrations during embossing. When the two rollers vibrate, they are prone to friction and cause ink marks. In addition, there are cases where the ink stick is easily caused by the pad of the pad being too large due to insignificant imprinting of the mouthpiece (light pressure). In this regard, the thickness of the lining should be accurately adjusted, and the ink layer should be uniformly transferred with the minimum printing pressure so as to maintain the consistency of the line speed between the rollers as a precondition. When adding a piece of paper to the mouth part of the mouth, use a gradually heating pad method, and do not add a pad at once, so as not to produce traces of ink marks.

6. The blanket is loose, it is easy to produce sliding friction when rolling, and there are traces of stripe ink. Therefore, measures should be taken to tighten the tension in time to prevent the production of printing ink bars.

7. When the self-adhesive Blanket is replaced, the old primer is not cleaned and the partial pressure inconsistency results in a trace of the ink.