800-235-8090

800-235-8090
sales@keystoneparts.com

Tuesday, June 4, 2013

Troubleshoot Adhesive Issues with Nordson Melter

SUGGESTED SOLUTIONS FOR ADHESIVE CHALLENGES

Challenge
Possible Reasons Possible Solution
Charring or Gelling Set Temperature is too high Lower set tank temperature
of Adhesive in Melter Overheating of tank walls Keep tank full of adhesive
Faulty heating control Check controls & replace if necessary
Oxidation of adhesive Keep tank full of adhesive.
Incompatible adhesives Change adhesive - flush with Red Baron 
Cleaner before using new glue.
One side of Substrate Temperature of adhesive too low. Increase temperature
Popping open after Too little adhesive applied Increase pressure or nozzle size.
Compression Clogged nozzles Clean clogged nozzles w/cleaning kit or replace
Both sides of Substrate Temperature of adhesive too high Decrease temperature
Popping open after Insufficient compression Increase compression time/force
Compression Too much adhesive Decrease application rate
Substrate shifting during compression Correct mechanics
Clogged nozzles Clean clogged nozzles w/cleaning kit or replace
Adhesive is Smoking Temperature of adhesive too high Decrease set temperature
Excessive exposure to air Keep tank lid closed at all times
Reduced or no Clogged nozzle Clean clogged nozzle w/cleaning kit or replace
Adhesive Flow Clogged inline and/or tank filter Replace filters
Temperature or pressure too low Adjust one or both
Adhesive Stringing Nozzle too far from substrate Move nozzle closer
Low pressure Increase pressure
Temperature of adhesive too low Increase set temperature
Poor machine timing or alignment Adjust timing or alignment
Adhesive has exceeded tank life Flush w/Red Baron cleaner & add new adhesive
Adhesive with Bubbles Moisture in substrate is evaporating Dry stock or lower application temperature
Air leaking into pump Replace seals and/or pump.
Cavitation of pump Increase supply of molten adhesive
May require a premelter
Poor Adhesion Temperature too low Increase set temperature
Inadequate adhesive Increase pressure or nozzle size
Difficult or coated substrate Consider selecting an alternative adhesive
Splashing at Substrate Temperature of adhesive too high Decrease set temperature
Air pressure too high Decrease air pressure
Incorrect nozzle position Change angle of nozzle
This Guide was developed to suggest possible causes and solutions to various problems that might occur with Hot Melt products.  Because this Guide was not designed to offer advice on your specific melter and specific application, refer to the equipment instruction manual before attempting any suggested solution above.

For free technical assistance call 800-235-8090.

Visit us at www.keystoneparts.com
Click for LARGER PRINT