mica heaters, band heaters, immersion heaters, extrusion heaters, injection moulding heaters

Flexible knuckle heaters, often supplied as standard on European and American machinery, are the ideal solution for applications which call for high watt density, easy fitting and handling.

Construction
The Miflex steel casing is formed with special overlapping serrations around circumferential edges to provide an ½ inch (12mm) flexible wall. A ceramic block element unit within the case is designed to accommodate the element spiral(s) in a series of parallel holes.

The blocks are arranged in an overlapping pattern, in a similar way to house bricks, and when threaded with the element(s) the arrangement forms a single flexible unit. A back insulation of ceramic fibre, between the element assembly and the case, reduces the heat loss.
Watts densities of up to 50 watts per square inch are provided in both single and multi phase arrangements.
The standard clamping on Miflex heaters is a "quick release" roller bolt system, developed by LPC to provide substantial strength and easy fitting. Other types can be fitted on request. It is important that knuckle heaters are clamped tight and retightening of clamps is recommended after warm up.
Standard terminations are M6 stainless studs within the terminal box, but cables, plug fittings or ceramic block terminals can be fitted as required.

Product Notes

Manufacturing Tolerances:

Resistance: +/- 7%
Wattage: +/- 7%
Voltage: 110 volts to 580 volts maximum
Inside Diameter: N/A
Widths: +/- .025" (0.635mm) due to hole spacings

Loadings:
Bands/Plates: 50w sq/ins 700 degrees C

Sizes:
Thickness: Round Heaters 1/2" (12mm) minimum
Diameter: (id): 4" (100mm) minimum
50" (127cm) maximum
Width: 3/4" (20mm) minimum
24" (610mm) maximum

Material:
Case: Coated Mild/Stainless Steel (on request)
Insulation: High Density Alumina Compound + Kaowool
Elements: 80/20 Nichrome

Testing:
All heaters are tested to British Standards 1500 volts Flash Test.

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