How to control the quality of ink in letterpress printing

The rapid development of the era, China's printing industry is also the case, in the printing process, should pay attention to whether the lining of the stamping due to too many times, there are depressions and affect the stability of the pressure, then timely measures should be taken to supplement or replace the lining lining , to ensure that the ink is uniform.

So, how to control the quality of ink in letterpress printing should start with the following two aspects: printing plate bottom pad technology, plate bottom pad technology.

1. The technology of printing plate bottom pad

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 during the printing process is large. If it is used to print a large-format plate product, the phenomenon of ink blooming and lightening is easy to occur, so only Suitable for printing small format products. When printing a large-size map version including a field version, it is preferable to use a magnetic version of a cast iron plate (base pad) or other metal structure plate holder.

2. The technology of printing plate bottom pad

The packing material should be made of a material with small deformation coefficient and good elasticity, so as to avoid the uniform and full transfer of the ink due to the fact that the underlining of the packing body can not be restored after being imprinted. In general, when the surface of the substrate is relatively smooth, the printed text version and cable screen version should use a neutral and hard lining, and when the printing surface is rough, suitable soft and flexible lining should be adopted. In order to prevent poor contact between the rough paper surface and the layout, resulting in ink color, lightening, lightening and other ills.

In addition, during the printing process, it should be noted whether the lining is overprinted due to too many stampings and there are depressions that affect the stability of the pressure. At this time, measures should be taken to supplement or replace the lining in order to ensure uniform ink color. However, for high-precision overprint products, the lining must not be changed during the printing process, and the blind lining thickness must not be blindly increased to eliminate the phenomenon of imprinting.

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