Air Circulation Furnaces

The air circulation chamber furnaces N 120/65 HACDB - N 500/65 HACDB are perfectly suited for debinding processes
that require a good temperature uniformity due to the parts geometry or characteristics of the binder. The powerful,
horizontal air circulation with high air flow rate provides for full utilization of the furnace in different charging layers.
Uniform process results are ensured even for small components, such as CIM manufactured parts. On request,
the furnaces can be equipped with catalytic or thermal afterburning to clean the exhaust gases.
Following the debinding the components are transferred to the sintering furnace.

• Tmax 650 °C
• Powerful, horizontal air circulation provides for a temperature uniformity of ΔT 8 K according to DIN 17052
• Debinding Package I with passive safety package and monitoring of the underpressure in the furnace chamber,
• exhaust gas fan, fresh air fan, preset underpressure in the furnace chamber,
• controlled by Nabertherm controller P 300
• Connection port for further piping behind the exhaust fan
• Welded inside housing of the furnace made of stainless steel 1.4301
• Holders for removable trays for charging in multiple layers
• 3 removable trays included with delivery
• Heating switched with low-wear semiconductor relay
• Over-temperature limit controller with manual reset for thermal protection class 2 in accordance
• with EN 60519-2 as temperature limiter to protect the furnace and load

Additional equipment

• Additional trays
• Controlled cooling including PLC control of the heating and cooling air fan
• Fresh air preheating and controlled fan cooling, including PLC control of the
• furnace heating as well as the fresh air preheating as a second heat source
• Debinding Package II with passive safety concept
• Thermal or catalytic exhaust cleaning systems
• Heat recovery systems
• Emergency purging with nitrogen
• Commissioning of the furnace with test firing and temperature uniformity
• measurement (also with load) for the purpose of process optimization
• Process documentation and control with Controltherm MV software package
• for the basic furnace or Nabertherm Control Center (NCC) for monitoring,
• documentation and control in combination with Debinding Package II

The air circulation bogie hearth furnaces W 1000/60 HACDB - W 8100/60 HACDB are designed
for debinding large volumes of material. The functionality corresponds to air circulation chamber
furnaces for debinding. These powerful production furnaces are equipped with a passive safety
package providing for a reliable process control. On request the furnaces can be equipped
with catalytic or thermal afterburning to clean the exhaust gases.

• Tmax 600 °C
• Powerful, horizontal air circulation provides for a temperature uniformity of ΔT 8 K
• according to DIN 17052 Debinding Package I with passive safety package and monitoring
• underpressure in the furnace chamber, exhaust gas fan, fresh air fan, preset
• underpressure in the furnace chamber, controlled by Nabertherm controller P 300
• Connection port for further piping behind the exhaust fan
• Inside sheets of the furnace made of stainless steel 1.4301 fully cover the insulation
• Heating switched with low-wear semiconductor relay
• Over-temperature limit controller with manual reset for thermal protection class 2 in
• accordance with EN 60519-2 as temperature limiter to protect the furnace and load

Additional equipment

• Controlled cooling including PLC control of the heating and cooling air fan
• Fresh air preheating and controlled fan cooling, including PLC control of the
• furnace heating as well as the fresh air preheating as a second heat source
• Debinding Package II with passive safety concept
• Thermal or catalytic exhaust cleaning systems
• Heat recovery systems
• Emergency purging with nitrogen
• Additional bogie, rail operation, cross-traversal system
• Commissioning of the furnace with test firing and temperature uniformity measurement
• (also with load) for the purpose of process optimization
• Process documentation and control with Controltherm MV software package for the basic furnace or
• Nabertherm Control Center (NCC) for monitoring, documentation and control for use of Debinding Package II

Certain processes release and vaporize solvents or other flammable vapors. The concentration of these
vapors must be kept below a certain limit to prevent ignition. European Norm EN 1539 and NFPA 86
in the USA prescribe the required safety equipment for these processes.

For these applications and processes, all air circirculation furnaces of the KTR and N ..HACLS product
lines are suited with safety technology for protection of a potentional ignition in the furnace chamber.

To avoid an ignition in the furnace, flammable vapors must be diluted with air. Special care must be taken
so high concentrations of flammable materials do not accumulate in “dead” areas within the furnace.
For this purpose, the furnaces are equipped with an exhaust gas fan providing for a defined suction flow.
A measurement system monitors this flow, while fresh air is simultaneously resupplied. In parallel,
the furnace atmosphere is diluted by the inflow of fresh air. The air circulation is also monitored by
the measurement system. Furnaces with a capacity greater than 1000 liters are additionally equipped with an explosion pressure relief.

• Furnace sizes between 120 and 10,000 liters
• Powerful exhaust fan capable of maintaining negative furnace pressure
• Defined and monitored air circulation flow and exhaust air
• Visual and audible emergency signals
• Overtemperature selection limiter with adjustable cutout temperature for thermal protection class
• 2 in accordance with EN 60519-2 as temperature limiter for the furnace and the product

With their maximum working temperature of up to 300 °C and forced air circulation, the ovens achieve
a perfect temperature uniformity. They can be used for various applications such as e.g. drying, sterilizing
or warm storing. The stainless steel interior chamber is easy to clean and rust-resistant.
For larger charges up to 10000 liters, the KTR product line is the right choice.

• Tmax KTR 260 °C and TR 300 °C
• Operating range, room temperature + 5 °C to 300 °C
• Models TR 60 - TR 240 designed as tabletop models
• Models TR 420 - TR 1050 and KTR designed as free standing models
• Horizontal, forced air circulation results in temperature uniformity better than ΔT 8 K
• Stainless steel chamber, alloy 304 (AISI)/(DIN material no. 1.4301), rust-resistant and easy to clean
• Large handle for opening and closing the door
• Charging in multiple layers possible using removeable trays (number of removeable trays included, see table below)
• Large, wide-opening swing door, hinged on the right with quick release for models TR 60 - TR 420
• Door hinge for models TR 60 - TR 420 can be simply changed from the right to the left side
• Double swing door with quick release for TR 1050
• Infinitely adjustable exhaust at the rear wall with operation from the front (only TR line)
• PID microprocessor control with self-diagnosis system
• Solid state relays provide for lownoise operation

Additional equipment

• Over-temperature limit controller with manual reset for thermal protection class 2 in accordance
• with EN 60519-2 as temperature limiter to protect the furnace and load
• Infinitely adjustable fan speed of the air circulation fan
• Window for charge observing
• Further removable trays with rails