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Aluminum Die Cast Air Cool Heater
Aluminum Die Cast Air Cool Heater
Finned cast-in heaters are designed to operate in air cooled extrusion systems and are the primary heat source. The thermodynamic relationship of an air cooled system's airflow, fins and heater body yields an extremely effective method of BTU removal from the extrusion process. The typical finned design of a cast-in band heater incorporates fins that extend 1" in height beyond the OD of the casting's body. The casting body is normally 1? thick. The geometry of the fin and number of fins per linear inch of casting width is somewhat flexible based upon application requirements. Normally the optimum distance between the fins, centre to centre, at the OD is 1/2" as a standard. Finned cast-in band heaters are manufactured in aluminium alloys because this material provides very good thermal conductive properties. For applications requiring higher operating temperatures and/or higher watt densities, bronze or brass alloys can be used. In certain instances where air cooling alone will not sufficiently cool the process, liquid cooling tubes can be cast into the heater as well to maximize BTU removal. A computer-designed, precision-formed tubular heating element is the heat source and can be furnished with a wide variety of termination styles for electrical connection. Precision machining of the inside diameter yields superior heat transfer between the heater and the machine barrel, thereby ensuring uniform heating and cooling of the extrusion process. The heaters are secured to the barrel either by stainless steel clamp bands or by means of bolt clamping the heater halves together. Finned cast-in band heaters are designed to meet mechanical and physical constraints of the extruder's shroud and/or cover characteristics. These units are manufactured to individual customer specification and are ideal for OEM applications and retrofits.
