The correct printing pressure is the key to the printing quality, especially the screen printing and dot screen printing have high requirements on printing pressure, and the correct printing pressure can print beautiful and high-quality products.
1. Pressure of ink leveling device
This pressure band refers to the pressure between the ink leveling roller and the anilox roller. Its main function is to control the size and uniformity of the ink transfer. The pressure between the two rollers is large (the gap is small), the amount of ink on the anilox roller is relatively small, otherwise the amount of ink is large.
The size of this printing pressure is related to the size of the printing area. Generally speaking, the pressure of a larger printing area can be lighter, so as to increase the amount of water ink to increase the thickness and vividness of the ink layer. The pressure of the small print area and more delicate text patterns is slightly larger to reduce the amount of ink and improve the clarity of fine text. The principle of this pressure generally depends on the characteristics of the product. When printing dots, the pressure is relatively large, the pressure of fine text lines can be slightly larger, and the large characters and large solid products can be relatively small.
2. The pressure of the ink transfer device
Ink transfer device
The function of the pressure between the anilox roller and the plate roller is to evenly transfer the ink on the anilox roller to the printing plate surface. Whether the pressure is correct or not has a great influence on the resolution of the printing. The pressure of the anilox roller on the plate roller is large, and the printed text pattern becomes thick, double shadow, reverse white, and small fonts are blurry. When the flexographic dot printing, the image will be seriously enlarged, making the tone level darker and Deep, poor image clarity, and excessive pressure at the same time will reduce the printing plate's printing durability, and it is easy to accumulate ink, and produce "irregular fat" deformation defects during printing. If the embossing force is too light, the ink of the anilox roller cannot be transferred to the printing plate, and the printing cannot be performed. The best printing pressure should be the horizontal contact between the anilox roller and the printing plate.
3. The pressure of the imprinting device
This pressure refers to the printing pressure of the plate roller and the platen roller on the cardboard. The effect of this pressure is that the ink layer on the printing plate is transferred to the cardboard accurately and accurately. In the printing process, this is the last key. The pressure is too large. The printed flexographic dots are spread out, the middle color is light, and the circumference is a deep circle, which has a great influence on the image level. The text line version is spread on both sides of the imprint, the small fonts are easy to blur, and there is a clear sense of depression when touched by hand. The correct pressure is that when the printed surface (protruding part) is in contact with the cardboard, the dot expansion is the smallest, the word line is clear, the double-printing is not spread, the text images are all printed, and the phenomenon of white leakage is best. The depth of pressing into the cardboard does not exceed 0.3mm. At the same time, during the printing process, it should be adjusted at any time according to the specific conditions of the printing to keep it in the best state.
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