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It is not that the second half of the printed product will produce a large number of nozzles on the ground or on flat screens. Generally, the nozzles will be printed in the following two situations.
(1) When printing on both sides, the amount of dust used on the first side of the print is large, and when the second side is printed, the nozzle print is likely to occur.
(2) The surface strength of the paper is not enough. When the paper powder is large, the nozzle printing is likely to occur, such as some gray-white cardboard.
In both of the above cases, the paper is accompanied by small particles such as paper dust and dust before it is fed. In normal feeding, when the feeder nozzle picks up and delivers the paper, the small particles such as dust, paper powder, etc., which are near the underside of the tail rubber suction apron, are sucked directly under the suction nozzle and in the suction nozzle. At the end of the separation or delivery movement, at the moment when the nozzles put paper, the small particles such as dust and paper powder just below the suction nozzle and in the suction nozzle are accumulated on the paper just below the suction rubber apron. In this way, there is a nozzle print formed of small particles such as paper powder and dusting at the end of the paper.
When the paper arrives at the first color group for simultaneous printing, not only the ink on the blanket is transferred to the paper, dust on the surface of the paper is also transferred to the blanket. In this way, after printing for a long time, a small layer of powder, paper powder and other fine particles will adhere to the blanket, and there will be several obvious ring-shaped white circles at the blanket dragging point. Due to the presence of small particles, such as paper powder and dusting, on paper and blankets, the transfer of ink is also affected to varying degrees during press printing. The performance is a pockmarked white spot on the solid color patch, a dirty part of the mesh tone, and a suction nozzle printing and a blanket pile of ink.
In order to eliminate the above drawbacks, when printing on both sides, a small amount of dry oil can be added to the ink on the first side to minimize the amount of dusting. If the surface strength of the paper is not enough and the paper powder is too large, the ink viscosity can be lowered. If nozzle printing has occurred, wipe the blanket in time, or place a large area of ​​the field or flat screen in the second or last color.
Source: Printing Technology
Nozzle printing solutions on printed products
When the printed matter is a large-area field or flat screen, there will be four looming circular circles in the second half of the print, the size of which is similar to that of Feida suction rubber aprons. This is the nozzle print.