Modules used for the application of hot melt are valves that allow adhesive to flow through nozzle tips and onto substrates.

Modules are attached to heated blocks called guns or applicators. These modules are actuated pneumatically into “On” position by a high speed solenoid or magnetic coil. This lifts the internal needle valve off the needle seat and high pressure hot melt flows.

These modules are turned “OFF” by pneumatic solenoid or internal spring forcing the needle valve against the needle seat stemming the flow of hot melt.

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What are Hot Melt Modules? - by Pierce Covert,
Glue Machinery Corporation
www.gluemachinery.com