Hot Melt Adhesive Troubleshooting Guide – Solutions to Common Problems

Troubleshooting to common hot melt adhesive and equipment problems. 

PROBLEM: POOR ADHESION

POSSIBLE CAUSES:

  1. Temperature too low 
  2. Inadequate adhesive 
  3. Difficult or coated substrate 

SUGGESTED SOLUTIONS:

  1. Increase temperature
  2. Increase pressure or nozzle size
  3. Consider an alternative adhesive

PROBLEM: STRINGING 

POSSIBLE CAUSES:

  1. Nozzle too far from substrate
  2. Low pressure
  3. Temperature of adhesive too low
  4. Hot melt has exceeded pot life

SUGGESTED SOLUTIONS:

  1. Move nozzle closer
  2. Adjust pressure 
  3. Increase temperature
  4. Flush system and refill with fresh adhesive

PROBLEM: STOPPED OR REDUCED ADHESIVE FLOW

POSSIBLE CAUSES:

  1. Plugged nozzle
  2. Blocked filter 
  3. Temperature or pressure too low

SUGGESTED SOLUTIONS:

  1. Flush system and replace nozzle 
  2. Clean existing or replace with new
  3. Adjust one or both 

PROBLEM: BUBBLES IN ADHEVISE

POSSIBLE CAUSES:

  1. Moisture in substrate is evaporating
  2. Air leaking into pump
  3. Cavitation of pump

SUGGESTED SOLUTIONS:

  1. Dry stock or lower aoplication temperature
  2. Replace seal and/or pump
  3. Increase supply of molten adhesive (use premelter or increase wattage)

Questions about adhesives? CONTACT US today and a glue expert will guide you through it! 

Leave a Reply

Your email address will not be published. Required fields are marked *