Moisture Curing Hot Melt Urethane or Polyurethane Reactive Hot Melt (PUR) is available in 310 ml cartridges to be processed by specially designed hot melt guns with cartridge adapters and nozzles.

If PUR drips, strings, leaks or flows from the nozzle after the gun is deactivated the gluing process can become extremely messy and costly as well as frustrating.

PUR cartridges fit directly into PUR guns where they are heated to a molten state and pressurize in order to flow. With the manual actuation of the pneumatic trigger compressed air is forced into the back of the cartridge. A floating piston separates the compressed air from the molten adhesive in the cartridge. With this pressure applied the molten adhesive flows through the check valve nozzle tip and is extruded onto the substrate. When the pressure is relieved the check valve ball and spring mechanism in the nozzle should quickly stem the flow of adhesive and minimize adhesive “Stringing” or dripping from the nozzle.

We recommend that the following steps are taken to insure that the PUR Cartridge Bead Gun operates properly:

1. Replace nozzle tips regularly
2. Attach threaded nozzle caps filled with high temperature grease to externally threaded nozzles when not in use
3. Replace adapters that attach the nozzle to the cartridge every few weeks
3. Insure that the gun is venting properly when deactivated
4. Do not use dented cartridges
5. Insure that foil seal in cartridge is punctured properly so that foil is not released into the nozzle
6. Preheat all cartridges with the correct preheater for the correct amount of time
9. Insure that the cartridges are thoroughly heated and completely molten before using
10. Raise the temperature of the adhesive where necessary to insure proper machining through the nozzle tip

Please call to discuss the performance of your PUR equipment.

PUR Nozzle tips by:
Pierce Covert,
Glue Machinery Corporation
www.gluemachinery.com