A substrate & UV adhesive checklist for converters, printers, and packaging engineers.
Quick answer
Most cold foil defects trace back to four variables: substrate surface energy, UV adhesive coat weight and cure, foil release tension, and press speed vs. lamp intensity. Diagnose one at a time — swap the foil last. Below is the same checklist our technical team uses on press-side calls.
Because foil is the visible variable, teams often blame it first. In our data, less than 15% of press-side troubleshooting calls end with a foil swap — the rest are corona, cure, or coat weight. Send us your form below and we will identify the two or three most likely causes before you buy another roll.
| Likely cause | Press-side fix |
|---|---|
| Substrate surface energy < 38 dyne/cm (BOPP, PET, coated board with silicone) | Corona-treat inline to 42–46 dyne/cm; verify with dyne pens each shift. |
| UV adhesive under-cured — lamps aged or speed too high | Measure with UV strips (EIT Power Puck); target 120–180 mJ/cm² at UVA; lower speed or replace lamps > 800 hrs. |
| Adhesive coat weight too low (< 1.2 g/m²) | Increase anilox volume (BCM 3.5–5.0 typical) or switch to higher-viscosity grade. |
| Contaminated substrate (anti-set-off powder, plasticizer bloom) | Reduce powder, run within 24 h of printing, or wipe with IPA on trials. |
| Likely cause | Press-side fix |
|---|---|
| Foil release tension too low — foil peels beyond adhesive edge | Increase rewind tension 5–10%; check dancer arm calibration. |
| Adhesive tacky at edges (over-application) | Reduce anilox BCM or add small dot-gain compensation in the plate; keep adhesive within artwork by 0.1–0.15 mm. |
| Static charge pulling foil fibers | Install ionizer bar before nip; ground the foil unwind. |
| Likely cause | Press-side fix |
|---|---|
| Air entrapment at the nip | Increase nip pressure gradually (start +0.05 mm); check impression roller shore hardness (65–75 Shore A typical). |
| Adhesive skinning between stations | Verify inter-station chill, reduce dwell, or switch to lower-reactivity monomer grade. |
| Foil not seated flat — telescoping roll | Reject rolls > 2 mm end-play; store foil at 18–24°C / 45–55% RH. |
| Likely cause | Press-side fix |
|---|---|
| Plate wear or excessive impression | Reduce impression to kiss; inspect plate for embossed shoulders every 20k impressions. |
| Adhesive viscosity too low | Cool ink duct to 22–25°C; select higher-viscosity UV adhesive. |
| Anilox worn or plugged | Ultrasonic-clean anilox weekly; replace when volume drops > 15%. |
| Likely cause | Press-side fix |
|---|---|
| Substrate stretch after foil chill | Add chill roller after foil station; allow 30 s stabilization before wet trap. |
| Trap not compensated in prepress | Add 0.1 mm chokes on inks over foil; discuss with your prepress team. |
| Foil surface repels overprint ink | Use UV inks with adhesion promoter, or specify overprint-friendly foil (ask CFS for a spec sheet). |
Fill in what you know. Our technical team replies within one business day with the two or three most likely causes and a specific fix to try on your next run.
For questions about the foil material used in your trial, contact CFS with the material details and what you observed.
Last updated: 2026-07-13 · Author: CFS technical team
No email required. Practical starting checklists — final settings must be confirmed by press trial on your own substrate, adhesive, foil grade and curing conditions.
Press-side worksheet to record the visible defect, work through likely causes in a fixed order, and collect the run data CFS needs to help.
A 15-point pre-production checklist covering substrate, adhesive transfer, foil path, nip pressure, UV curing, registration and first-run inspection.