Importance

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Abstract

A two channel electronic temperature controller for a gun for dispensing a hybrid plastisol hot melt adhesive that is flowable a room temperature. As the hot melt material is pumped under pressure from a supply source through a pre-heater and then through a gun having a gun heater, a first channel transmits signals from the electronic temperature controller which control the temperature of a pre-heater and a second channel from the electronic temperature controller transmits signals from the electronic temperature control which control the temperature of the gun heater and the pumping pressure. A sensor in the temperature controller detects when the pre-heater and gun heater are at a dispensing temperature or at a lower inactive temperature. When the gun is inactive for a predetermined time, a senses the inactivity and directs a control to reduce the temperature and shut off the pump. A reset switch in the temperature controller, when pressed, increases the temperature in the heaters to bring the hot melt material up to a suitable temperature for dispensing material from the gun and resumes the pressure upon the material.

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First Claim