Problem: Ink flakes off substrate, comes off when crinkled, or is removed easily in tape test.
Causes:
1. Viscosity too high
2. Viscosity too low
3. Ink surface tension too high
4. Incorrect ink system for substrate
5. Poor film treatment
6. Ink drying too slow
7. Substrate surface contamination
8. Insufficient web temperature
Solution:
1. Reduce viscosity consistent with acceptable
printability
2. Add virgin ink to fountain
3. Consult your technical sales representative
4. Ensure that the correct ink for the substrate is being used
5. Check surface of film for adequate treatment; treat in-line, if possible
6. Check driers for heat and airflow; consult your ink manufacturer
Solvent Flexo: Reduce with faster solvent blend
7. Check with film supplier as to advisability of applying a primer before printing, use in-line treater
8. Increase temperature settings of driers, check drier balance
