Cold foiling in narrow web printing – how to diagnose faults:
 

Problem

Cause

Solution

Foil transfer irregular across the width

Nip roller uneven over width or damaged

Contact pressure too low

  • Readjust or replace nip roller

 

  • Increase the contact pressure 

 

Poor foil transfer
  • Nip roller too soft

 

  • Contact pressure too low

 

  • Use harder nip roller

 

  • Increase the contact pressure

 

Design not transferred cleanly
  • Too much adhesive

 

  • Nip roller too soft

 

  • Adjust anilox roller

 

  • Increase the contact pressure

 

Foil not being transferred
  • Adhesive too old, no longer reactive, etc.

 

 

  • Replace adhesive
Adhesive not adhering to substrate
  • Adhesive not cured

 

  • UV lamp too weak

  • Increase the UV lamp output

 

  • Corona treatment in the case of plastics

 

Crazing on the design
  • Foil tension too high

 

  • Foil adhering to nip roller

 

  • Adjust the foil tension

 

  • Clean or replace nip roller 

 

Rough edges and crowning
  • Incorrect print impression settings

 

  • Incorrect nip roller pressure

 

  • Adjust print impression settings

 

  • Adjust nip roller

 

Pinholes in the decorated design
  • Insufficient adhesive

 

  • Pressure of nip roller too low

 

  • Increase the amount of adhesive

 

  • Adjust the nip roller pressure

 

 

Poor scratch resistance
  • Inadequate curing of UV adhesive

 

  • Increase the UV lamp output

 

Contact
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