Modular applicator having a separate flow loop to prevent stagnant

Abstract

A modular adhesive applicator assembly in which electrical, thermal and fluid communication between a main block and individual modules occur at one face of the main block and in which a separate flow loop within each module is provided to prevent adhesive degradation within the module. Each module has an inlet port in fluid communication with an opening in the main block. The inlet port is located at an intermediate region of a solenoid armature used to control flow from the inlet port to an outlet port. A high-volume adhesive flow path extends forwardly along the solenoid armature directly to the outlet port. A low-volume adhesive loop extends rearwardly along grooves within the exterior of the solenoid armature and then forwardly within a central bore of the solenoid armature. A radial bore to the central bore provides fluid communication to the high-volume adhesive flow path. The flow loop allows the introduction of adhesive along the intermediate region of the armature without requiring a seal along the length of the solenoid armature and without creation of stagnant regions in which adhesive can age.