Ink must transfer, set or cure, and survive the required finishing process on the actual substrate. The same color can require a different ink system on coated paper, board, PET, PVC, PP, labels, or a pre-laminated surface.
Select the system before the color
| Condition | Offset ink focus | UV / energy-curing ink focus |
|---|---|---|
| Absorbent paper or board | Transfer, set, drying, rub resistance, and finishing window | Confirm that UV is actually required |
| Film, label, or non-absorbent substrate | Do not assume paper ink will adhere | Surface, primer, lamp type, cure energy, ink film, finishing |
| Heavy coverage, white, or spot color | Film thickness, drying, set-off | Full cure through the complete ink film and flexibility |
| Lamination, foiling, die-cutting, or rub | Surface condition and drying | Cure, adhesion, bend, rub, and finishing compatibility |
Traditional offset and UV systems have different operating and cleaning requirements. Food contact, low migration, low odor, chemical resistance, or regulatory requirements must be stated before a trial and confirmed through the applicable product documentation.
Trial sequence
- Provide press type, substrate sample, color target, coverage, lamp or LED configuration, speed, finishing sequence, and current issue.
- Print on the actual production substrate. Keep material, press speed, and process conditions fixed while comparing ink.
- For UV work, record lamp type and condition, reflector system, speed, and ink film. A surface that feels dry is not proof of complete cure through a heavy ink layer.
- After normal cure or drying, perform the relevant tape adhesion, bend/crease, rub, and finishing tests. Retain the approved color standard, ink batch, substrate, and process record for repeat work.
Troubleshooting order
| Symptom | Check first | Do not start with |
|---|---|---|
| Tape-test ink loss | Substrate/primer, ink film, cure conditions | Increasing lamp output or ink film without evidence |
| Cracking after crease or finishing | Flexibility, ink film, cure, and actual crease | A flat-sample adhesion check only |
| Color cannot be repeated | Physical standard, substrate, ink film, and recorded settings | Visual adjustment from memory |
| Poor rub resistance | Cure/drying, substrate, coverage, and test method | Calling the ink defective without a test condition |
Review MEGAMI UV Ink for its public application scope, then confirm the trial plan against the actual material.