| 摘要 |
A compact glue heater for heating the flow of glue to a labeling machine has two spaced apart metal plates welded together at their edges and a rib running part way along the center of the space to define a U-shaped conduit between the plates. A glue inlet pipe connects to one end of the conduit and an outlet pipe connects to the other. Electric heaters composed of heat resistant insulating sheets with electrically resistive material between them interface with the outside surfaces of the respective conduit forming plates to form a heater and conduit assembly. The heater and conduit assembly is sandwiched between metal plates secured together by spacer blocks at their corners to form a unitary assembly removably supported on the spacer blocks in a cavity in a closed housing in spaced relationship to the walls of the cavity thereby inhibiting heat transfer through the housing. A current controller, mounted within a separate cavity of the housing, is governed by glue temperature and pressure sensors and a fusible element is provided for causing the controller to interrupt current to the heaters if an unsafe temperature is reached.
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