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DuraBand® with Built-In Strap

DuraBand® with Built-In Strap
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Band Heaters DuraBand® with Built-In Strap General purpose terminal box can be attached on Duraband diameters of 63.5 mm (2¹⁄₂") or larger. It offers excellent protection to exposed terminals. To simplify wiring, the box has a 13 mm (¹⁄₂") trade size knockout [actual diameter 22 mm (⁷⁄₈")] that will accept standard conduit or flexible armor cable connectors. It can be field assembled on most band heaters with screw terminals having a center distance of 22 mm (⁷⁄₈"). Flexible armor cable for lead protection is available where abrasion is a problem. F or maximum surface contact, the torque resistant and virtually unbreakable stainless steel screw terminals are securely fastened to a connecting jumper, assuring positive contact with the windings and providing maximum amperage carrying capacity. For other terminal or lead arrangements, see pages 13 through 18. Specially designed mounting brackets with ¹⁄₄"-20 socket cap screws are used to draw the built-in strap to a high degree of tension. This tension exerts the great amount of drawing power required to pull the heating element assembly against the cylinder evenly and tightly across its entire width, thus eliminating all air gaps that can cause premature heater failure. The number of bracket assemblies used increases as the width of a Duraband heater increases. Specially treated rust-resistant steel sheath casing provides the best combination of physical strength, high emissivity and good thermal conductivity to heated cylindrical parts, good for sheath temperatures up to 480°C (900°F). Specially selected grade and thickness of mica sheet is used to insulate the windings, providing excellent thermal conductivity and dielectric strength. The gauge of nickel-chrome resistance ribbon wire is selected to achieve the lowest internal element temperatures possible, resulting in maximum heater life. The ribbon wire is wound evenly spaced on a specially selected mica strip, providing even heat distribution and thus eliminating hot spotting that can cause premature heater failure. Duraband’s built-in strap is a unique design feature. A low thermal expansion alloy sheath is used for the outer sheath, covering the entire width of the band heater.

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Band Heaters • Built-In Bracket for Superior Clamping • Unbreakable and Torque-Resistant Screw Terminals • Temperatures Up to 480°C (900°F) • Full Width Stainless Steel Built-In Strap • Flexibility to Incorporate Holes and Cutouts • Available Two-Piece and Expandable Designs • Best Mica Insulated Heater on the Market • Faster Delivery than Any Other Type of Heater Band • Most Economical Among Various Heater Bands • Most Versatile and Commonly Used Heater Band Typical Applications • Plastic Injection Molding Machines • Plastic Extruders • Oil Reclamation Equipment • Food and Candy...

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Band HeatersStandard Specifications and Tolerances Performance Ratings Maximum Temperature: Standard Sheath: 482°C (900°F) Nominal Watt Density: 3 to 7 Watt/cm2 (20 to 45 Watt/in2) Maximum Watt Density: Dependent on heater size and operating temperature Electrical Ratings Maximum Voltage: 480 Vac Dual Voltage or 3-Phase: Available depending on heater design Maximum Amperage: Lead Wire Termination: 10 Amp Screw Terminations: 8-32 UNF—20 Amp; 10-32 UNF—25 Amp Resistance Tolerance: 10%, -5% Wattage Tolerance: 5%, -10% Physical Size Construction Limitations Minimum Width: 19.1 mm (3/4") Width...

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Band Heaters Maximum Watt Densities Maximum Allowable Watt Density The chart displays the maximum Watt Density curves for various diameter heaters. Use this chart when determining the appropriate wattage value for your chosen heater. Be aware that certain factors will require you to derate the watt density (Watt/in2) of your heater selection. CAUTION: Failure to adhere to the maximum allowable watt density per heater size will result in poor operating life. Correction Factors For heaters wider than 76.2 mm (3"), reduce maximum recommended watt density from chart by 20%. For applications...

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Band Heaters Construction Styles Construction Types One-Piece Band The one-piece construction is available on any screw or lead termination and clamping variation. It can be used where band heaters can be slipped over the end of the cylinder. Shown with Type NB Built-In Strap Two-Piece Band The two-piece construction is available on any screw or lead and clamping variation. The Duraband two-piece design provides a built-in hinge, making handling and installation easier. It is used on large cylinders or where the heater cannot be slipped over the end of the cylinder. Two-piece band heaters...

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Band Heaters Construction/Clamping Variations Standard Built-In Strap Clamping (Low Thermal Expansion) The built-in strap is available with any screw or lead termination and construction variation. The built-in strap eliminates the use of awkward-to-handle separate straps, providing more drawing power than any other type of clamping system. The Duraband with built-in strap is standard on many designs. Type NB shown Type NB—One-Piece Band Minimum ID: 50.8 mm (2") Minimum Width: 31.8 mm (1¹⁄₄") Type NS—Two-Piece Band Minimum ID: 76.2 mm (3") Minimum Width: 31.8 mm (1¹⁄₄") Type NE—One-Piece...

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Band Heaters Construction/Clamping Variations Spring Loaded with Built-In Bracket The heavy duty stainless steel spring with built-in bracket is a variation on the basic Duraband® design. It is available with any screw or lead termination and construction variation. It is recommended for heaters over 305 mm (12") in diameter, and for any diameter heater used in the vertical position, to prevent the heater from slipping off the machine. The springs provide constant tension, therefore maintaining optimum surface contact against the cylinder being heated. Type SL shown Type SL—One-Piece Band...

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