How to control the quality of ink color in letterpress printing

During the printing process, attention should be paid to whether the liner has too many impressions, and there are depressions that affect the stability of the pressure. At this time, measures should be taken to patch or replace the outer liner to ensure uniform ink color.

1. Check the process technology of printing plate bottom pad

The base of the wooden structure is the traditional underlay Material of the embossing process, but its stability is poor, and the ink color variation during printing is large. If it is used to print large-format plate products, the ink color will be prone to bloom and become lighter. Suitable for printing small format products. When printing large format plates, including solid plate products, it is appropriate to use magnetic plate holders (bottom pads) of cast iron structure or plate holders of other metal structures.

2. Keep the printing plate cylinder lined with technology

The packing material should be made of materials with small compression deformation coefficient and good elasticity, so as to prevent the packing body from sinking after being imprinted and unable to restore its original state, which will affect the ink transfer evenly and fully. Generally, when the surface of the substrate is smooth, the neutral and hard liner should be used for printing the text version and the screen version; when the paper with a rough surface is printed, the softer and better elastic liner should be used. In order to prevent the bad contact between the rough paper surface and the plate surface, the ink color will be bloomed and lightened. In addition, during the printing process, attention should be paid to whether the liner has too many impressions and there are depressions that affect the stability of the pressure. At this time, measures should be taken to patch or replace the outer liner to ensure uniform ink color. However, for overprinted products with higher precision, the liner must not be replaced during the printing process, nor can the thickness of the liner be increased blindly to eliminate the phenomenon of imprinting.

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