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MI Band Heaters
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MI Band Heaters

Product Overview

The MI Band is a high performance heater. Its performance and name are derived from Watlow's exclusive mineral insulation - a material that has much higher thermal conductivity than the mica and hard ceramic insulators used in conventional heaters.

MI Barrel & Nozzle

A thin layer of the "high" thermal conductive MI material is used to electrically insulate the element wire from the inside diameter of the heater sheath.   A thicker, "low" thermal conductivity layer backs up the element wire, directing the heat inward towards the part that is being heated. The result is more efficient heat transfer, a performance solution that lowers element wire temperatures and increases heater life.

Performance Capibilities

  • ​Heater operating temperatures to 1400 ° (760 ° C)
  • Watt densities to 230 W/in2 (35.6 W/cm2) available on small diameter nozzle bands.
  • Watt densities to 100 W/in2 (15.5 W/cm2) available on large diameter barrel bands.

Features & Benefits

​Operating temperatures to 1400F (760C) make it possible to safely melt even the newest resins, like Peek, Teflon, Ultem and Zytel.Higher watt densities than any other band contribute to faster heat-up and throughput to increase productivity.

High thermal conductivity of MI and low mass construction give almost instant response to temperature control. This performance solution eliminates thermal lag and temperature overshoot associated with ceramic knuckle heaters.
Stainless steel cover as well as side fold design resist contamination by overflow of plastic or other free-flowing materials. Side folds turn to the inside diameter rather than the outside diameter.
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Permanently attached clamp bars eliminate cumbersome clamping straps, which makes installation easier.

Available Options

Option Descriptions

Lead Wire
Heaters rated at less than 250V ~ (ac) use UL approved lead insulation for operations to 480 ° F (250 ° C) as standard.   Lead insulation UL rated for operation to 840 ° F (450 ° C) is available for high temperature application where the leads are shrouded or enclosed with the heater.

Thermocouple
ASTM Type J or K internal thermocouples are available on lead Type B with loose braid.
 
Expanded Heaters with and without Leads
Expandable heaters are two-piece units with a common top metal that allows the heater to expand open to the full diameter of the barrel.   On expandable bands, each half will be one half of the total wattage.   Plus, on both expandable and two-piece bands, each half will be rated at full operating voltage, unless otherwise specified.

Type SLE
Two fiberglass lead wires exit a single tightly woven metal braid at right angle on the expandable construction versus two sets of leads.

High temperature "Quick Disconnect" European Style Plugs
Maximum 15 amps at 240~(ac), maximum volts 240.

High Temperature "Quick Disconnect" European Style Female Adaptors
Available as an accessory item that must be used in conjunction with high temperature "quick disconnect" European style plugs.

Heavy Duty Strain Relief
Heavy-duty strain relief is recommended for applications where there is a great stress or continued flexing of the leads.

Ceramic Terminal Cover
Ceramic covers, with openings for leads, are screwed on to post terminals, providing a convenient, economical insulator.

Metallic Terminal Box
Metallic terminal boxes are available from stock on 3 ½ inches inside diameter x 1½ inches wide (89mm x 38mm) or larger heaters.   Two-piece heaters require two boxes.

MI Band Heater with Holes
MI Band heaters with holes are available on all widths except one inch wide.   Consult your Proheat representative for hole sizes and location restraints.

Outside Diameter Heater
Two fiberglass insulated lead wires rated to 840 ° F (450 ° C) exit a metal braid 180 degrees opposite from gap.

Tig Welded Barrel Nuts with Spring Loaded Clamping
Welded barrel nuts with spring loaded clamping are used during start-up to maintain a tight heater fit on large barrels.   This clamping variation is standard for all MI Band heaters that are greater than 14 inches (355mm) in diameter and 1 ½ inches (38mm) or greater in width.

Tig Welded Barrel Nuts
An ideal way to provide access for instrumentation is to specify an oversized gap between the heater ends.

Low Profile Tig Welded Barrel Nuts
Low profile barrel nuts are available on all widths.   Low profile barrel nuts have a clearance of 0.406 inch (10mm).

Low Profile Clamp Bars
Low profile clamp bars are available on both one (25mm) and 1½-inch (38mm) wide heaters, for wider widths consult factory. The bars are ¼ inch (6mm) diameter with an 8-32 screw.

Sealed MI Nozzle Heater 
Hermetically sealed tube construction makes this heater contamination proof and an excellent choice for a longer life in impure environments.
Teflon and Zytel are registered trademarks of E.I. du Pont de Nemours & Company.   Ultem is a registered trademark of General Electric Corporation. Peek is a registered trademark of Greene, Tweed and Company.

Used with permission from Watlow Electric Manufacturing Company, 2003

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