In the printing process, the blanket plays the role of transferring ink to the paper, that is, some ink and paper wool are inevitably adhered, and the accumulation of the time is easy to cause the accumulation, called the pile of rubber. Rubber stacking will affect the printing. In order to ensure the quality of finished products, rubber stacking should be handled in time. The following briefly introduces several reasons for accumulation and solutions:
1
Uneven coating of the surface of the paper or insufficient sizing results in "piling rubber".
Solution: In addition to adding an appropriate amount of additives , it can also appropriately reduce the printing pressure without affecting the quality of the printing , and slow down the speed of the vehicle during the printing process to reduce the peeling of the paper. If possible, you can pass the white material through the empty roller to remove part of the paper wool and paper dust on the surface of the paper.
2
Ink viscosity is too high. Stick the fibers and paper powder on the surface of the paper, so it is easy to pile up on the blanket.
Solution: Put an appropriate amount of additives or viscosity reducers in the ink to reduce the viscosity of the ink. The amount of additives should be controlled to avoid affecting the drying performance and gloss.
3
The surface of the blanket is crystallized and is too smooth. The smooth surface of the blanket absorbs paper wool impurities much more than the rough blanket.
Solution: Wash the blanket thoroughly to restore the surface of the fluff, or choose a blanket with a slightly rougher surface to get better results.
4
Ink is too emulsified. After the ink is emulsified, the pigment will be separated from the floating state, and it will stay on the blanket and cause "stacking of rubber" or stay on the printing plate to cause "stacking". The ink on the ink roller is sticky and granular, and the ink is dull, etc. phenomenon.
Solution: It can be solved by cleaning the ink roller , appropriately reducing the viscosity of the ink, and adjusting and controlling the water and ink balance.
5
The drying speed of the ink is too fast. Due to the thinnest ink layer on the ink rollers of the unit, the viscosity is the strongest when drying, the transfer rate drops, and the reverse pull phenomenon occurs, which results in a "rubber pile" phenomenon.
Solution: lower the temperature of the workshop and keep the humidity at about 65%; or add an appropriate viscosity reducer or desiccant to the ink.
6
Improper color order. The ink viscosity of the back color group is greater than that of the front color group, and the back color group pulls down the ink of the front color group to cause accumulation, and in serious cases will also cause cross color. It can be solved by adjusting the color sequence and adjusting the viscosity of the ink so that the viscosity of the ink of the rear color group is slightly smaller than the viscosity of the ink of the front color group.
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