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  Debinding line with integrated heat recovery system for utilizing the exhaust heat for fresh air preheating

N 250/65HACDB with debinding package I

Charging cart with pull-out trays

N 120/65 HACDB - N 500/65 HACDB

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 limiter 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
  • 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, NTLog and NTGraph for the basic furnace or Nabertherm Control Center (NCC) for monitoring, documentation and control
 

Air Circulation Bogie Hearth Furnaces for Debinding in Air up to 600 °C

W 3300/85A Bogie hearth furnace system for debinding with cross sliding device

Furnace chamber with air baffle plates

W 1000/60 HACDB - W 8100/60 HACDB

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 limiter 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
  • 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, NTLog and NTGraph for the basic furnace or Nabertherm Control Center (NCC) for monitoring, documentation and control
 

Air Circulation Chamber Furnaces/Ovens with Safety Technology for Solvent-Containing Charges according to EN 1539 or NFPA 68

 
  Ship-lock type furnace N 560/26HACLS with safety technology, front charging and rear unloading Drying oven KTR 1500 for drying of foundry cores with an alcohol-based binder

Exhaust port and powerful exhaust fan mounted on the furnace

Guide-in tracks for furnaces with bottom insulation

Safety Technology for Air Circulation Chamber Furnaces

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 68 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 underpressure. 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.

  • Furnace sizes between 120 and 10,000 liters
  • Powerful exhaust fan capable of maintaining underpressure in the furnace
  • 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
 

Clean Room Solutions

 
  KTR 8000 designed as a production furnace in the clean room with filters for air recirculation Hot-wall retort furnace NRA 1700/06 with charging frame for installation in grey room with charging door in clean room

Air circulation chamber furnace NAC 120/65 with clean room specs

Air circulation furnace N 250/65 HAC for clean room Class 100 with charging door to the clean room

Clean/Grey room solution with charging and operating in clean room

Clean room applications impose particularly high requirements to the design of the chosen furnace. If the complete furnace is operated in a clean room an essential contamination of the clean room atmosphere must be avoided. Especially, the particle contamination must be reduced to a minimum.

The specific application determines the choice of the required furnace technology. In many cases air circulation furnaces are required to achieve the necessary temperature uniformity at lower temperatures. For higher temperatures, Nabertherm has also delivered many furnaces with radiant heating.

Furnace Installation in the Clean Room

If the complete furnace is supposed to be positioned in the clean room, then it is important that both the furnace chamber and the furnace housing as well as the controls provide for good protection against contamination. Surfaces must be easy to clean. The furnace chamber is tightly sealed to the insulation behind it. If necessary, additional equipment such as filters for the fresh air supply or the air circulation in the furnace can be used to improve the cleanliness class. It is recommended to install the switchgear and the furnace controls outside the clean room.

Furnace Installation in the Grey Room, Furnace Charging from the Clean Room

Optimal results with respect to cleanness will be achieved by placing the furnace in the grey room with charging from the clean room. This significantly reduces the amount of costly space needed in the clean room to a minimum. The front and the furnace interior in the clean room are designed for easy cleaning. With this configuration even the highest clean room classes can be achieved.

Sluice Furnace between Grey Room and Clean Room

Logistics between clean room and grey room can often be easily sorted out. Lock furnaces with one door in the grey room and the other door in the clean room are the perfect choice for these applications. The inner chamber as well as the furnace front in the clean room will be especially designed for lowest particle contamination.

Please contact us if you are looking for a heat treatment solution under clean room conditions. We would be pleased to quote for the oven or furnace model that meets best your requirements.

 

Ovens, also with Safety Technology According to EN 1539 Electrically Heated

TR 240 TR 60 with observation window

TR 450 with observation window

TR 1050 with double door

Electrical rotating device as additional equipment

TR 60 - TR 1050

With their maximum working temperature of up to 300 °C and forced air circulation, the ovens achieve a perfect temperature uniformity which is much better than in ovens of most competitors. They can be used for various applications such as e.g. drying, sterilizing or warm storing. Ample warehousing of standard models provides for short delivery times.

  • Tmax 300  °C
  • Working temperature range: + 5  °C above room temperature up to 300  °C
  • Models TR 60 - TR 240 designed as tabletop models
  • Models TR 450 and TR 1050 designed as floor standing models
  • Horizontal, forced air circulation results in temperature uniformity better than ∆T 8 K
  • Stainless steel chamber, alloy 304 (AISI)/(DIN material no. 1.4301), rust-resistant and easy to clean
  • Large handle to open and close the door
  • Charging in multiple layers possible using removeable grids (number of removeable grids included, see table to the right)
  • Large, wide-opening swing door, hinged on the right with quick release for models TR 60 - TR 450
  • Double swing door with quick release for TR 1050
  • TR 1050 equipped transport rollers
  • Infinitely adjustable exhaust at the rear wall with operation from the front
  • PID microprocessor control with self-diagnosis system
  • Solid state relays provide for low­noise operation

Additional equipment

  • Over-temperature limiter 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 removeable grids with rails
  • Side inlet
  • Stainless steel collecting pan to protect the furnace chamber
  • Safety Technology according to EN 1539 for charges containing liquid solvents (TRS) up to model TRS 240, achievable temperature uniformity +/- 8 °C
  • Transport costors for model TR 450
  • Various modifications available for individual needs
  • Upgrading available to meet the quality requirements of AMS 2750 E or FDA
  • Process control and documentation with Controltherm MV software package
ModelTmaxInner dimensions in mmVolumeOuter dimensions in mmHeatingElectricalWeightGrids in-GridsMax.
 °Cwdhin lWDHpower in kW²connection*in kgcludedmax.total load¹
TR 60 300 450 380 350 60 700 650 690 3.1 1-phase 90 1 4 120
TRS 60 260 450 360 350 57 700 680 690 6.3 3-phase 92 1 4 120
TR 120 300 650 380 500 120 900 650 840 3.1 1-phase 120 2 7 150
TRS 120 260 650 360 500 117 900 680 840 6.3 3-phase 122 2 7 150
TR 240 300 750 550 600 240 1000 820 940 3.1 1-phase 165 2 8 150
TRS 240 260 750 530 600 235 1000 850 940 6.3 3-phase 167 2 8 150
TR 450 300 750 550 1100 450 1000 820 1440 6.3 3-phase 235 3 15 180
TR 1050 300 1200 630 1400 1050 1470 955 1920 9.3 3-phase 450 4 14 250
¹Max load per layer 30 kg *Please see page 80 for more information about supply voltage
²Depending on furnace design connected load might be higher 
 

Chamber Dryer Electrically Heated or Gas-Fired 

 
  KTR 1500 with charging cart KTR 21640/S with chamber lightning and drive-in tracks with insulated plugs which provide for an optimal temperature uniformity

Standard models

Motor-driven rotary rack with baskets for moving the charge during heat treatment

KTR 3100/S for curing of composites in vacuum bags incl. pump and necessary connections in the oven chamber

Air circulation in the chamber dryer

The chamber dryers of the KTR range can be used for complex drying processes and heat treatment of charges of normal weight and packing density to an application temperature of 260 °C. The high-performance air circulation enables optimum temperature uniformity throughout the usable space. A wide range of accessories allow the furnace to be modified to meet specific process requirements. The design for the heat treatment of flammable materials in conformance with EN 1539 is available for all sizes.

  • Tmax 260  °C
  • Electrically heated (via a heating register with integrated chrome steel heating elements) or gas-fired (direct gas heating including injection of the hot air into the intake duct)
  • Temperature uniformity up to ∆T 6 K according to DIN 17052-1 (for design wihout track cutouts)
  • High-quality mineral wool insulation provides for outer temperatures of < 20  °C above room temperature
  • High air exchange for fast drying processes
  • Double-wing door for furnaces KTR 3100 and larger
  • Over-temperature limiter with manual reset for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the dryer and load
  • Incl. floor insulation

Additional equipment

  • Entry ramp for pallet trucks or track cutouts for charging cart
  • Optimal air circulation for individual charges by means of adjustable air outlets
  • Fan system for faster cooling with manual or motor-driven control
  • Programmed opening and closing of exhaust air flaps
  • Observation window and furnace chamber lighting
  • Safety technology according to EN 1539 for charges containing solvents
  • Charging cart with or without rack system
  • Design for clean room heat treatment processes
  • Process control and documentation with Controltherm MV software package
ModelTmaxInner dimensions in mmVolumeOuter dimensions in mmHeatingElectrical
 °Cwdhin lWDHpower in kW¹connection*
KTR 1500 260 1000 1000 1500 1500 1930 1430 2315 21.0 3-phase
KTR 3100 260 1250 1250 2000 3100 2160 1680 2880 30.0 3-phase
KTR 4500 260 1500 1500 2000 4500 2410 1930 2880 48.0 3-phase
KTR 6125 260 1750 1750 2000 6125 2660 2180 3000 50.0 3-phase
KTR 8000 260 2000 2000 2000 8000 2910 2430 3000 59.0 3-phase
¹Depending on furnace design connected load might be higher *Please see page 80 for more information about supply voltage

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