In order to prevent this kind of malfunction, the mixed ink (especially the old ink) should be filtered once with a net before use. When reusing a used printing plate, the old ink attached to the plate frame must be completely removed. When storing the printing plate after printing, wash it sufficiently (including the squeegee). If you follow the above requirements, the uneven ink will not happen.
If the tip of the squeegee is damaged, there will be traces along the direction of movement of the squeegee. Especially when printing transparent materials, there will be obvious ink unevenness. Therefore, the front end of the scraper must be well protected so that it will not be damaged. If it is damaged, it must be carefully polished with a grinder.
The unevenness of the printing table will also affect the uniformity of the ink. The ink layer on the convex part is thin, and the ink layer on the concave part is thick. This phenomenon is also called uneven inking. In addition, if there is dust on the back of the substrate or on the printing table, the above-mentioned failures may also occur.
