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Printing process causes stacking failure and exclusion
1. Printing ink
(1) The viscosity of the ink is too high, and the fibers in the paper coating are sticked, deposited and adhered to the surface of the blanket, and are transferred to the next sheet of paper, resulting in the printing of graphic arts.
Printing stack failures occur on multi-color offset presses. In general, the first group of blanket cylinders is less prone to stacking, primarily on the second or subsequent blanket cylinders. The reason is that the blanket after the second group is affected by the wetting fluid. The residual sticky factor of the former color causes the viscosity of the ink to increase, which causes the pile-up problem on the rear blanket to become more and more serious.
(2) Ink allocation too thin
Thin ink, small cohesion, affect the transfer, resulting in the ink roller, printing plate and blanket gradually accumulate the pigment particles of the ink, can also cause heap failure.
(3) Drying speed of ink
When the ink drying speed is too fast, the viscosity increases, the yield value increases, the fluidity and transferability also change, and the ink accumulates on the ink roller. In the printing process, in order to make the print quickly dry, often add too much dry oil in the ink, not only caused the ink roller aging, and the ink ink film thickens, resulting in emulsification, so that the ink layer on the plate can not be from the middle Most of the breakage occurred on the printing plate, causing a failure in stacking.
Remedy:
According to the operating requirements of the printing process, for different stacking phenomena, different varnish and proper amount of dry oil are properly added to the ink to improve the printability of the ink and improve the ink transfer performance.
2. Wetting fluid
During the printing process, ink and water are out of balance, and the layout is too watery, which causes water layer separation between the ink rollers and between the ink roller and the printing plate, which hinders smooth ink transfer and causes ink emulsification. If the wetting fluid is too acidic, it will also cause the ink to emulsify, causing stacking failure.
Common wetting fluids for offset printing include common wetting fluids, non-ionic surfactant wetting fluids, and alcohol wetting fluids. If you use ordinary wetting fluid, you must control the concentration, pH value and the conductivity of the wetting fluid, so as to reduce the ink emulsification phenomenon and avoid stacking failure.
3. Blanket
In order to obtain prints with even ink, clear dots, rich layers, and vivid colors, blankets need not only have good ink absorption properties, but also must have good ink transfer properties. After the blanket absorbs the ink, it can continue to absorb after it reaches saturation, that is, the blanket has too strong absorption, and it will accelerate the condensation of the ink on the surface. If the blanket is poor in ink transfer, the amount of ink transferred to the surface of the substrate will be insufficient, which will not only affect the quality of the printed matter, but will also cause more and more ink on the surface of the blanket, resulting in stack failure.
Method of exclusion:
First of all, we must determine the reason for stacking ink, test the ink absorbency and ink transfer property of the blanket, how long can the ink be allowed to be exposed during blanket drying, and how fast the blanket can absorb the standard test ink. When the blanket is soaked in the ink solvent How much will it swell? Compare these test results with a standard blanket to find out why the blanket is stacked, and take steps or replace the blanket. Otherwise, the problem of heaping ink will also occur. Also need to wash the blanket.
Paper Problems Cause Stacking Faults and Troubleshooting
1. Paper falling powder, hair loss caused by stacking ink
Paper off powder, hair loss caused by printing ink failure, showing the paper on the layout of white flowers.
2. Inappropriate handling of paper during drying, pressing, calendering, and other manufacturing processes
In the drying process, if the temperature of the drying cylinder is too high, the first several drying cylinders will not only cause the fibers to adhere to the cylinder surface, but also cause rapid vaporization and make the paper structure loose. During the printing process, fine fibers and pigment particles are easily detached, causing stack failure.
Method of exclusion:
In the papermaking process, the surface strength of the paper must be improved, the papermaking process should be strictly controlled, and the area and binding strength of the paper fibers should be enhanced to prevent the occurrence of powder dropping and hair loss.
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Stacking ink causes and solutions
In the lithographic printing process, the ink accumulates on the printing plate, the ink roller and the blanket, which affects the smooth transfer of the ink and causes the printing failure. We call this the failure of stacking ink. When the stacking ink starts to form, the text in the halftone portion becomes thicker, and then the ink film on the ink roller becomes thick and the surface is rough and matt.