Potential Problems in Printing – Description of Problems and Proposed Solutions
Problem | Solution |
---|---|
1. Too thick. | 1. Use new ink. |
2. Too slow. | 2. Use faster thinner. |
Problem | Solution |
---|---|
1. Too deep. | 1. Produce new cliche with shallower etching depth. |
2. Wrong screen ruling. | 2. Test new cliche with different fineness of half tone screen. |
Problem | Solution |
---|---|
1. Rough surface. | 1. Replace pad. |
Problem | Solution |
---|---|
1. Very slick, dense material structure. | 1. Substrates where surfaces cannot be dissolved by thinner are esp. problematic (e.g., glass). |
Problem | Solution |
---|---|
1. Insufficient pretreatment or subsequent treatment. | 1. Heat objects before printing, or ventilate them for thinner to evaporate faster. |
During high speed printing operations, the last ink printed may be removed by next pad. This occurs particularly on larger surfaces, where material cannot be dissolved by thinner, or with slower inks in connection with carree or rotary indexing tables and linear belts. The problem hardly ever arises when adjustable tables are used. The best solution is to pre-heat objects or dry them with cold or hot air at intervals during the printing run