Glue Modules: What is the Cause of My Leaks?
Being knowledgeable regarding your glue guns/modules can help in diagnosing issues. Are you having leaking, dripping, stringing or stoppage issues?
Understanding the Components of Your Glue Module
The glue applicator gun body only controls the temperature and is a go between hydraulically from the hose to the module that is mounted on the gun body.
The glue module is the valve that controls the glue flow out of the nozzle. Opening of the module is triggered either by compressed air or electricity, depending on the type of system you have. Closing of the module is controlled by either compressed air, electricity or spring.
Common Issues with Glue Modules
In order for the module to open, the needle must lift off of the seat to allow adhesive to flow. In order to close, the needle must seat firmly and completely to form a seal on the seat to stop the adhesive flow.
The needle seating process can be significantly affected by pressure, adhesive viscosity, compressed air, adhesive cleanliness or spring used to close the needle.
If adhesive is too thick, the air solenoid could have issues pushing the spring closed, therefore, preventing a tight shut off seal. Dirty air flow can cause module to open/close improperly and dirty glue can produce buildup at the seat, causing loss of a tight seal. Spring tension loss over time will eventually cause affect closing time.
Other factors that affect performance are worn seals and worn nozzles.
Talk to a Keystone Expert
Need help with a glue module issue? Contact one of our representations today or give us a call at (800)235-8090.