Likely Causes

1. Static on film: Repels/attracts powder unevenly.

2. Humidity too low/high: Affects charge and wetting.

3. Powder has absorbed moisture: Clumped powder does not distribute evenly.

4. Ink is too dry before powder application: Powder won't stick to dry ink.

Quick Checks

• Wipe film with anti-static cloth.
• Set RH 40–55%, ionize if available.
• Sift powder through a fine mesh screen.
• Check time between printing and powdering; reduce delay.
• Observe the powder application curtain for consistency.

Step-by-Step Fix

1. Install ionizer at powder station — Neutralizes static.

2. Store powder in an airtight container with desiccant — Prevents moisture absorption.

3. Adjust printer/shaker speed to minimize time between print and powder — Ensures ink is wet enough for powder to adhere.

4. Clean shaker and vacuum any old powder residue — Prevents clumps from being recirculated.

5. Increase shaker vibration slightly to break up small clumps — Improves powder flow and uniformity.