How to control the quality of ink in letterpress printing
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During the printing process, it should be noted whether the lining is affected by excessive embossing and the presence of dents, which affects the stability of the pressure. In this case, measures should be taken to replace or replace the outer lining to ensure uniform ink color.
1. Put a good plate bottom pad technology
The bottom of the wooden structure is the traditional bottom pad material of the embossing process, but its stability is poor, and the ink color variation is large during the printing process. If it is used for printing large-format plate products, it is prone to ink color and lightening, so only Suitable for printing small format plates. When printing large format plates including the field version, it is advisable to use a cast iron structure (bottom pad) or other metal structure plate.
2. Putting a good plate roller lining process technology off
The packing material should be made of a material with small compression deformation coefficient and good elasticity to avoid the uniform and sufficient transfer of the ink due to the fact that the lining of the lining body cannot be restored after being embossed. Generally, when the surface of the substrate is smooth, the printed text version and the screen version should be made of a neutral and hard lining; and when the paper with a rough surface is printed, a suitable soft and flexible lining should be adopted. In order to prevent poor contact between the rough paper surface and the printing surface, it may cause defects such as ink coloration and lightening. In addition, during the printing process, it should be noted whether the lining is affected by excessive embossing and the presence of dents, which affects the stability of the pressure. In this case, measures should be taken to patch or replace the outer lining to ensure uniform ink color. However, for overprint products with high precision, it is not allowed to replace the lining during the printing process, and the thickness of the lining should not be blindly increased to eliminate the embossing phenomenon.