Industrial Ovens and Dryers, Heat Soak Test

These chamber ovens are available for maximum working temperatures of 260 °C or 450 °C.
They are suitable for numerous processes such as pre-heating of moulds, ageing or drying.
The version suitable for temperatures up to 450 °C is recommended for Heat Soak testing of
Toughened Safety Glass (TSG). During a Heat Soak Test in accordance with EN 14179-1
the panes are exposed to a temperature of 290 °C for at least four hours in order to transform
nickel sulfide inclusions and hence to prevent the pane from breaking spontaneously later.
The documentation of the heat treatment process is strongly recommended. Program entry,
visualization and the documentation of the process are achieved by means of the PLC-control
in combination with the powerful Nabertherm Control Center (NCC), which registers and archives
the temperatures at different measuring points on the pane. The 260 °C ovens can also be used
for production of Laminated Safety Glass (LSG). During this process two panes are bonded using
a laminating foil and entered into the oven inside a vacuum bag. From outside the furnace a
vacuum is generated via hose connection in order to avoid air inclusions between the panes during the heat treatment.

• Tmax 260 °C or 450 °C
• Heated electrically or with gas
• Electrical heating by means of heater coils
• Direct gas heating or optionally indirect gas heating with temperature transfer via steel tube or heat exchanger
• Available with horizontal (type/HA) or vertical air circulation (type/A) for optimal uniformity in your charge
• Ground level charging without floor insulation for 260 °C models
• Optimum temperature uniformity (according to DIN 17052-1) up to ΔT 10 K
• Optimal air circulation for your charge by means of adjustable air outlets
• Furnace chamber lined with alloy 314 (AISI)/(DIN material no. 1.4841)
• Low shell temperature by means of high quality mineral wool insulation
• Manually adjustable air inlet and exhaust air vent
• High air exchange for fast drying processes
• Furnace sizes suitable for common charging systems, such as pallets, baskets, etc.
• Double-winged door for models with an internal width of more than 1500 mm
• Over-temperature limit controller with adjustable cutout temperature for thermal
• protection class in accordance with EN 60519-2 as temperature limiter controler to protect the oven and load

Additional equipment

• Data recording via Nabertherm Control Center (NCC) in accordance with the
• requirements of EN 141791 for Heat Soak Tests of Tempered Safety Glass (TSG)
• Racks for loading of standing glass panes
• Connection ports for vacuum bags inside the oven for Laminated Safety Glass (LSG).
• The vacuum pump is connected on the outside of the furnace.
• Optional floor insulation for improved temperature uniformity on 260 °C models
• Entry ramp or track cutouts for floor-level charging of models with insulated bottom
• Electro-hydraulic lift-door
• Fan system for faster cooling with manual or automatic control
• Automatic control of exhaust air vents for better ventilation of the furnace chamber
• Window and furnace chamber illumination
• Safety technology according to EN 1539 for charges containing solvents
• Catalytic or thermal exhaust gas cleaning systems
• Custom sizes up to 40,000 liters and charge weights up to 30 tons

These classic industrial ovens with air circulation are characterized by their extremely high
temperature uniformity. Hence, they are especially suitable for processes such as cooling,
crystalizing, pre-heating, curing, but also for numerous processes in tool making. Due to
the modular concept, the furnaces can be adjusted to the process requirements by adding suitable equipment.

• Tmax 450 °C, 650 °C, or 850 °C
• Horizontal air circulation
• Swing door hinged on the right
• Optimum temperature uniformity (according to DIN 17052-1) up to ΔT 6 K
• Heating from bottom, sides and top
• Optimum air flow and temperature uniformity through high circulation rates
• One shelf and rails for two additional shelves included
• Air baffle box of stainless steel inside the furnace chamber for optmum air circulation
• Switchgear with solid-state relays

Additional equipment N 30/45HA - N 500/85HA

• Cooling system with fan for fast cooling
• Automatic control of air inlet and exhaust air vents for better ventilation and faster cooling of the furnace
• Pneumatic lift-door
• Atmosphere boxes for protective gas operation
• Additional shelves
• Variable frequency control of air circulation velocity for sensitive parts
• Charging aids, roller conveyors

For some heat treatment processes it is important to reduce the particle disposal in the
furnace chamber to a minimum. To achieve highest protection for these applications these
specific chamber furnaces with welded inner box and insulation fully covered with stainless
steel sheets are recommended. The ovens are perfectly suitable for heat treatment
processes of glass with an emphasis on a clean surface of the product.

• Design of models N ../HA plus:
• Horizontal airflow
• Special sealing of the housing
• Insulation covered with stainless steel sheets
• Optimum temperature uniformity at 250 °C - 650 °C of up to ΔT 6 K in accordance to DIN 17052-1
• Operation under protective gases as an option

For larger charge weights the chamber ovens can also be equipped with movable bogies.

Standard Version (different from chamber furnaces N 30/45HA ff.):

• Tmax 650 °C or 850 °C
• Freely steerable bogie on polyurethane wheels
• 3-sides heating: from both sides and from bogie
• Vertical air circulation with powerful fan in the furnace roof
• Air guidance sheets for optimal temperature uniformity
• Description of the control system see page 42

Additional equipment

• Atmospheric boxes for protective-gas operation
• Electro-hydraulic lift-door
• Vapour vent systems
• Bogie running on rails
• Electric drive for bogie running on rails
• Cooling system
• Multi-zone temperature control to optimize temperature distribution up to Δ T 6 K in accordance with DIN 17052-1
• Exhaust air flap control for faster cooling
• Customized dimensions