초록 ▼

A method and heating system for a hose and dispenser wand of a hot melt mix applicator uses a three phase heating element powered by a generator to heat the hose and wand to maintain hot melt mix material within the hose and wand in a flowable state. To selectively energize the generator to control

A method and heating system for a hose and dispenser wand of a hot melt mix applicator uses a three phase heating element powered by a generator to heat the hose and wand to maintain hot melt mix material within the hose and wand in a flowable state. To selectively energize the generator to control heat input, the heating system has (1) a controller in communication with a temperature sensor carried by the hose or wand, and (2) an output in communication with a generator control input. The generator control input enables operation of the generator to be controlled by the controller for controlling heating of the hose and wand. The heating element is a cord having a first wire receiving a phase of the three phase current, a second wire receiving another phase of the current, and a third wire receiving another phase of the current, with the cord being wrapped about the hose and wand in a helical configuration. The generator preferably is a vehicle alternator modified so that it outputs three phase electrical power without requiring any voltage or current regulation. In a preferred method, the controller energizes the generator when the sensed temperature of the hot melt mix falls to or below a predetermined setpoint control temperature and deenergizes the generator when the sensed temperature rises to or above a predetermined setpoint control temperature.

대표청구항 ▼

[ What is claimed is:] [1.] A hot melt mix applicator dispensing a heated, flowable material comprising:a. a source of said heated flowable material;b. a nozzle for dispensing said flowable material;c. a conduit having one end in communication with said source of said heated flowable material and it

[ What is claimed is:] [1.] A hot melt mix applicator dispensing a heated, flowable material comprising:a. a source of said heated flowable material;b. a nozzle for dispensing said flowable material;c. a conduit having one end in communication with said source of said heated flowable material and its other end in communication with said nozzle for permitting the passage of said heated flowable material from said source to said nozzle;d. a pump for delivering said flowable material through said conduit to said nozzle;e. a source of three phase electrical current having an electrical potential no greater than 60 volts;f. an electric three phase heating element supplied with three phase electrical current from said three phase current source and in thermal relation with said conduit for heating said flowable material in said conduit;g. a temperature sensor in thermal relation with said conduit for sensing a temperature of said flowable material disposed in said conduit;h. wherein said electric three phase heating element comprises a cord wrapped around said conduit substantially the length of said conduit wherein said cord comprises three wires with a first wire connected to said three phase current source and carrying a phase of said three phase current source, a second wire connected to said three phase current source and carrying another phase of said three phase current source, and a third wire connected to said three phase current source and carrying a still further phase of said three phase current source;i. wherein said three phase heating element cord produces a heating flux of at least about 2.5 watts per square inch; andj. wherein application of three phase current to said wires of said three phase heating element cord is controlled by said temperature sensed by said temperature sensor.