Potential Problems in Printing – Description of Problems and Proposed Solutions
Problem | Solution |
---|---|
1. Too thin. | 1. Reduce amount of thinner. |
2. Transparent ink. | 2. Use opaque color shade. |
3. Wrong ink system. | 3. Use pad printing ink . |
4. Scanty ink transfer. | 4. Locate defect in cliché or pad. |
Problem | Solution |
---|---|
1. Insufficient etching depth. | 1. Produce new cliche with greater etching depth. |
2. Areas not screened. | 2. Screen area. |
3. Areas not slanted. | 3. Slant areas. |
4. Wrong cliche type. | 4. Use cliche which allows screen to be etched with it. |
5. Wrong screen ruling. | 5. Test new cliche with different fineness of half-tone screen. |
Problem | Solution |
---|---|
1. Too flat. | 1. Use more tapered pad shape. |
2. Porous surface. | 2. Replace pad. |
3. Too soft. | 3. Use harder pad. |
Problem | Solution |
---|---|
1. Soiled surface. | 1. Clean surface with alcohol. |
2. Dark substrate color. | 2. Double print. |
3. Surface too rough. | 3. Use harder, more tapered pad. |
4. Stress cracks (esp. on injection molded parts). | 4. Use milder ink/thinner system or quick drying ink/thinner to avoid any dissolution of substrate. |
Problem | Solution |
---|---|
1. Soiling from greasy residues on accessories(auxiliaries). | 1. Clean cliche,doctor blade, etc.before installing. |
2. Doctor blade sags. | 2. Use harder or thicker doctor blade (or see cliche points 2 and 3). |
This problem very often occurs in pad printing, and cannot always be solved satisfactorily. Due to the low degree of ink transfer in pad printing, 100 % opacity cannot be achieved on many objects with only a single printing, especially in the case of dark substrates. Increased hiding power can be attained by double or triple printing or preprinting with white.
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