Apri/ChiudiCartridge Heaters
High Watt Density
High Watt Density with TC
Medium Watt Density
Low Watt Density
Extra-High Watt Density
Hi-Temp. Super Sealing
Low Voltage
PTC Self-Limiting
Bolt Heaters
Cartridge Heaters for Fluids
Hi-Temp. Super Sealing
Options & Accessories
Catalogue download
Apri/ChiudiMicrotubular Coil Heaters
Standard Sizes
Ordering Forms
Coiling Machine
Special Versions
Hi-Temp. Super Sealing
Catalogue download
Apri/ChiudiNozzle Heaters
Features (Piromax)
Brass Nozzle Heaters
Stainless Steel Nozzle Heaters
Extra-Thin Nozzle Heaters
Catalogue download
Apri/ChiudiBand Heaters
Mica Band Heaters
Ceramic Band Heaters
Rectangular Band Heaters
Cast Alu/Brass Heaters
Protection Housings
Insulating Pads
Contact Accessories
Connection Boxes
Clamping Devices
Catalogue download
Apri/ChiudiFlat Heaters
Mica Flat Heaters
Cast Alu/Brass Heaters
Grooved Heating Plates
Apri/ChiudiFlat Cartridge Heaters
Connection Options
Heating Options
Bending in Shapes
Application and Shapes
Catalogue download
Apri/ChiudiTubular Heaters
Plain Tubular Heaters
Square Cross-Section
Finned Tubular Heaters
Duct Air Heaters
Threaded Immersion Heaters
Flanged Immension Heaters
Catalogue download
Apri/ChiudiCartridge Heaters for Radiators
Constant-power Heaters
PTC Self-Limiting Heaters
Connection Fitting
Control Units
Catalogue download
Apri/ChiudiInfrared Radiant Heaters
Applications & Choice
Technical Data
Thermo-sensitive Colours
Catalogue download
Apri/ChiudiFully-Ceramic Heaters
Technical Data
Apri/ChiudiThermocouples & Resistances
MgO-insulated TC
Conventional TC
Catalogue download
Apri/ChiudiHeating Cable
Self Regulating
Constant Power
Mineral Insulated
Freeze Protection
Apri/ChiudiFlexible Heating Tapes
Etched Foils - General informations
Features - Etched Foils
Apri/ChiudiDrum Heaters for Barrels
Integral Drum Heaters
Flexible Drum Heaters
Apri/ChiudiMoSi2 Heaters
Apri/ChiudiAir Heaters
Apri/ChiudiTemperature Control Units

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Cast Band/Flat Heaters

Cast Aluminium and Cast Bronze heaters offer optimum heat transfer directly to the contact surface.

These heaters are usually custom designed in house using state of the art cad ware alongside many years experience to obtain maximum heater life.

Every shape and size can be manufactured in our modern patternshop and foundry, before being fully machined in our machine shop prior to termination at final assembly.

There are many terminations available from metric to American threads, high temperature leads to high temperature plug and socket arrangements.

They can be designed as heater only, water/oil cooled or air cooled. Insulated or un-insulated cowls are available in sheet steel or Cast Aluminium.

Recommended Limits
Watt density:
Cast Aluminium 4.7 W/cm
Cast Bronze 7 W/cm
Cast Aluminium 400C
Cast Bronze 650C

・Extruder Barrels
・Extrusion Die Heads
・Blow Moulding machines
・Food warming
・Glue pots
・Rubber presses
・Window machines
・Transfer machines

Liquid cooled applications
These units are designed and manufactured using the highest quality heavy walled alloy tubing for maximum thermal shock resistance. They are available with straight tube connection or threaded connectors. These units offer many advantages including:
・Maximum thermal conductivity
・Uniform heating of contact surface
・Fast, effective cooling control
・Excellent mechanical strength
・Extremely reliable unit
・Simple to fit
・Available with cowls for maximum energy conservation

Air cooled applications
Our experience has evolved from the very first finned heaters supplied to the extruder industry into complete insulated units which can also be supplied with top quality blowers ready to install straight onto the extruder barrel. The design offers the maximum surface area for optimum cooling efficiency and minimum energy loss. Our design team have the capability to manufacture complete lines for renewal of existing air cooled lines or for the conversion of older water cooled extruders. Our facility allows us to manufacture a wide range of sizes to suit the smallest extruder up to the largest. Cowls can be insulated or un-insulated in Aluminium coated mild steel or Stainless Steel, they can also be supplied in Cast Aluminium or Cast Bronze for areas where a more robust unit is required.

Installation Recommendations
・Surface to be heated must be clean from contamination, smooth and compatible to the machined surface of the heater.
・Water fittings must be free from leaks, threaded connectors are the most common way of ensuring this.
・Heater must be seated correctly and securely clamped to the extruder barrel.
・After initial warm up to operating temperature, the heaters should be isolated from the electricity supply and re-tightened to compensate for thermal expansion.
・All connections should be made with suitable high temperature wiring. Terminal enclosures can be provided up to IP65 for ease of wiring and operator safety. All units must be adequately earthed.

・Heaters must be disconnected from supply before any maintenance is carried out.
Electrical connections should be periodically checked to prevent arcing which could damage the heater terminals
・Heater clamping arrangements should be checked regularly and re-tightened when required.

Required details for a quotation
・Inside diameter
・Outside Diameter
・Width of heater
・Termination positions
・Termination type
・Air/Water cooled
・Wattage and Voltage


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1999 ROTFIL s.r.l. Via Praglia 15 10044 Pianezza TO (Italy) > How to reach us < Partita Iva 01846410015
T. +39-011-9683-111 - F. +39-011-9683-225 - e-mail:info@rotfil.com

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