Prevention and Diagnosis of Failure in Web Printing (III.II)

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Table 3 shows the situation of web breaks associated with the printing unit. The following analysis is performed in turn.

Printing Unit Tension Drift Crease Wrapping Paper 1. When the paper breaks, the tension of the paper reaches the maximum when the paper is turned on. ● The viscosity of the ink is too high, causing the paper to break ● Water or detergent is present in the roller slit ● Plate protection On the printing plate, it is easy to form wrapping paper when it is switched on. 2. The emergency stop causes the tension change from wet paper to dry paper. 3. The multiple paper paths break the paper at the same time. 4. Water, ink or other substances fall on the web. 5. Uneven print pressure setting ● ● ● 6. Too much or too little rubber blanket lining or printing without shoulder iron ● ● Between the blanket units, uneven liner ● ● ● ● Shoulder In iron printing, there are too many linings ● The installation is wrong ● The viscosity of the ink is not matched with the elasticity of the blanket ● The blanket is damaged ● The ink and paper are piled on the blanket ● ● 8. The guide roller and the pair of paper ink and paper Accumulated at both ends of the roller ● The installation is not complete or the support is damaged, the clearance is too large ● ● 9. The paper is not aligned and not horizontal when printing ●


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