Tempco Electric Heater Corporation
Tempco - Cast-In Band Heaters
As a standard, Cast-In Band Heaters are manufactured in aluminum 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. Cast-In Band heaters can be made with one of two cooling methods: Liquid-cooled or Air-cooled. Used heavily in plastics extrusion processes, the cooling function within our cast-in band heaters is important for maintaining the proper temperature of the barrel. Precision machining of the band heater`s inside diameter yields superior heat transfer between the heater and machine barrel and is finished to customer specifications.
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CAST MATERIALS
- Aluminum
- Material: Standard Aluminum 319 (Optional Aluminum 356 in Learn More)
- Maximum Surface Temperature: 700°F (371°C)
- Density (lb/in3): 0.101
- Coefficient of Linear Thermal Expansion (in/in/°F × 10-6): 12.7 @ 68° – 572°F
- Thermal Conductivity (BTU-in/hr-ft2-°F): 754
- Bronze
- Material: Bronze
- Maximum Surface Temperature: 1350°F (732°C)
- Density (lb/in3): 0.272
- Coefficient of Linear Thermal Expansion (in/in/°F × 10-6): 9 @ 68° – 572°F
- Thermal Conductivity (BTU-in/hr-ft2-°F): 437
- Brass
- Material: Yellow Brass
- Maximum Surface Temperature: 1200°F (649°C)
- Density (lb/in3): 0.304
- Coefficient of Linear Thermal Expansion (in/in/°F × 10-6): 12.2 @68° – 500°F
- Thermal Conductivity (BTU-in/hr-ft2-°F): 582
COOLING METHODS
- None
- This cast-in does not need a cooling feature.
- Finned without Side Flanges
- The standard mounting method for these designs is bolt clamping. An alternative mounting method is to use stainless steel straps. Type "T" screw terminals are the standard termination.
- Finned with Side Flanges
- The standard mounting method for these designs is bolt clamping. An alternative mounting method is to use stainless steel straps. Type "E" screw terminals are the standard termination.
- Liquid Cooled Band - Single Set of Cooling Tubes
- The single set cooling tube design features 1/4", 3/8" or 1/2" diameter tubing precisely formed into a serpentine or any other suitable shape and cast into the body of the Cast-In Heater. This is the most widely used method for providing a means of cooling in liquid-cooled Cast-In Heaters. From this basic design, the user can choose to factory equip the cooling tubes with any of the cooling tube termination options.
- Liquid Cooled Band - Dual Set of Cooling Tubes
- The Dual cooling tube design incorporates two sets of 3/8" or 1/2" diameter tubing formed into a serpentine or any other suitable shape within the same Cast-In Heater. Dual cooling tubes will actually double the operating life of a Cast-In Heater with liquid-cool function, since cooling tube failures usually occur before heating element failures
- Liquid Cooled Band with Recessed NPT Fittings
- The recessed cooling tube design incorporates 3/8" or 1/2" diameter tubing formed into a serpentine or any other suitable shape with specially designed stainless steel NPT fittings that are welded to the tube ends and cast below the surface of the Cast-In Heater, thus eliminating the troublesome, commonly used tube extensions as they exit the casting for connection to the coolant lines.