Knuckle Band

Knuckle Band

  • The Knuckle Band, a segmented ceramic band heater, was designed to provide evenly-distributed heat on extrusion and injection molding barrels.
  • Tutco Knuckle Bands are designed for higher operating temperatures that are needed with today's high temperature resins. With the insulation between the outer sheath and ceramic bricks, power consumption is reduced up to 30 percent.

 

Product Details

Knuckle Band - Features & Benefits

  • Even heat distribution
  • Decrease in energy waste - lower wattage requirement
  • Longer heater life
  • Flexible segmented ceramic allows for easy installation
  • Energy-passing fiberglass insulation
  • Stainless steel sheath and shroud
  • Heater can be made with holes and slots

Knuckle Band - Industries & Applications

Knuckle Bands can be modified to meet the demands of virtually any special application.

  • Ideal for use on Injection and extrusion barrels (when processing low, medium and high temperature resins)
  • Pipe and drum heating
  • Injection molding machines
  • Extruders
  • Blown film

Knuckle Band - Termination Styles

Screw Terminals Opposite Gap

Opposite the Gap Along the Width

Opposite the Gap Along the Length

Opposite the Gap Along the Length

Opposite the Gap Along the Width


Terminals are available opposite the gap only for this heater.

Knuckle Band - Shapes & Construction

Special with Holes

Heaters can be built to satisfy your special requirements. Certain applications require holes for thermocouples, to clear tubing, wiring, and other obstacles. These modifications require customer drawings to specify exact diameters and locations of the holes. Special order only.


Special with Cutout

When clearance is a problem with band heater installation, consider requesting slot cut-outs. This can greatly facilitate installation. Drawing is required with exact dimensions and locations. Special order only.


Knuckle Band - Clamping

Strap Standards

Straps can be vastly modified to fit a wide variety of bands. As wider bands are used, multiple straps will most likely be designed in. Normally barrel nuts are built into the ends: one threaded, one through hole. Slots shown are to clear termination areas. Unless otherwise specified, straps are assigned by our engineering staff to best suit each application.

Clamping


Full-Width Strap


Ear Clamping


Bar Clamping


Illustrated are the various available styles of clamping for band heaters. When a band is provided the material is of a low coefficient of expansion type. Width of the clamping band or the number used per heater is dictated by the design standards. There are a variety of clamping mechanisms that can be attached to the band or directly to the heater. The most common forms are the strap and strap ends. Factors influencing the type and size of clamping are:

  • Type of band heater
  • Diameter and Width
  • Termination type and location
  • Holes and notches in heater
  • Preferences of the user


Belleville Clamping

A clamping system is generally selected for use with large diameter heaters where additional compensation of band elongation is required. Belleville clamping comes with a standard 1/4 - 20 X 5" (12.7 cm) long screw.


Spring Bolt Clamping

Spring bolt clamping applies constant tension on the clamping mechanism to compensate for heater elongation once it has been energized. Spring bolt clamping comes with either a 1/4 - 20 X 4" (10.7cm) or 1/4 - 20 X 5" (12.7cm) long screw.


Turnbuckle

Specified where a heater is used to heat an I.D. surface. Use of this mechanism is governed by the heater diameter and width. Obstructions such as shafts passing along the center line of the heater may present an interference problem. 1/4 - 20 X 2 1/2" (63.5 mm) long screw.


Wedge-Lock

Specially designed for mounting where space is limited. Eliminates the need for straps. Leads must exit opposite gap.