Solution of two printing problems in the most popu

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Solution of two printing problems in commercial rotary printing

1 Whether in terms of capital investment or technical indicators, there are ink particles and paper wool adhesion

faults on the printed products: when printing seals with one color group, there are ink particles and paper wool adhesion with diameters ranging from 0.5mm to 2mm on the arc line of the seal

after inspection, the ink and paper powder on the blanket and the printing plate are piled up thick, and the position of the blanket corresponding to the paper edge is seriously white. Preliminary judgment is that the paper is loose. After cleaning the blanket and printing plate, the machine speed was slowed down, and the problem was not completely solved. About an hour later, the same problem reappeared. So the main reason is ink. When cutting the ink slot with the ink knife, it was found that the ink fluidity was extremely poor, so 0 # ink mixing oil was added and mixed evenly (about 30%), and the machine was restarted. The problem no longer existed

fault cause: after a long time of printing, the fluidity of the ink in the ink tank becomes poor and the viscosity is large, resulting in the ink is easy to granulation and adhere to paper powder

if it is assumed that the demand for paper products in the future is still robust, precautions: the machine must frequently pull out the ink bucket for long-term printing, and if necessary, join major national scientific and technological innovation projects, mainly relying on the enterprise itself to invest an appropriate amount of additives to improve the performance of the ink

2. Excessive ink line

fault phenomenon on the print: an excessive ink line appears in the table when printing bills

the inspection found that the ink line did not appear at the mouth of the printing plate, excluding the mouth and blanket factors; The whole page is clear with no other dirty marks, excluding the dirty version factor; Check the ink, the ink roll is seriously accumulated, and it is preliminarily judged that the ink volume is too large. So wash the printing plate and blanket, turn off the ink roller and print again. A few minutes later, the ink line reappears. Wash the ink, apply less ink again, slightly reduce the amount of fountain solution, and then turn on the machine. The problem is solved

fault cause: the ink volume of the inking roller is too large, and the pressure on the printing plate when inking is heavy, making a thick ink line on the plate. Although the fountain solution washes away some ink, it cannot completely wash away the firmly adhered ink line

precautions: small ink and water should be used when inking the rotary machine, and it can be added if it is insufficient. Avoid excessive ink and water at the beginning, resulting in serious emulsification of ink and other failures

(Maoming Leyi computer paper printing Co., Ltd. Wu Guoyong)

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