Likely Causes

1. Storage outside 40–55% RH: Coating absorbs/desorbs moisture.

2. Bringing cold film into a warm, humid room: Condensation forms on the film surface.

3. Direct exposure to sunlight or HVAC vents: Causes localized drying or moisture changes.

4. Film roll left open to ambient air for extended periods: Outer layers of film are most affected.

Quick Checks

• Acclimate rolls in print room 24h.
• Measure room humidity; ensure it is within 40-55%.
• Feel the film surface for any tackiness or dampness.
• Unroll a few feet of film and check for flatness.

Step-by-Step Fix

1. Use dry cabinet / sealed bins — Maintains RH window.

2. Acclimate new film rolls for at least 4 hours before use — Allows film to stabilize to room conditions.

3. Store rolls vertically and in their original packaging — Prevents pressure marks and protects from dust.

4. Install a humidifier or dehumidifier to maintain stable room RH — Creates a consistent production environment.