The N and NB chamber furnaces are especially designed for dewaxing and subsequent firing of the ceramic form. The electrically heated models are operated below the ignition point of the wax during dewaxing. The furnaces have a heated stainless steel drain in the bottom of the furnace chamber, formed as a funnel with the discharge near the center of the furnace. The drainage is made of stainless steel. The stainless steel grids in the bottom can be removed for cleaning . To prevent draining wax from ignition, there is a tight stainless steel container under the furnace with a removable drawer for wax collection as a safety feature. After the dewaxing process is finished the furnace continues heating in order to sinter the molds.
Standard equipment N../WAX, electrically heated
Chamber furnace with wide-opening swinging door
Tmax 850 °C
Four side heating with freely radiating heating elements on ceramic carrier tubes
Heated drainage in floor, controlled by a separate controller up to a maximum of 200 °C, to reliably prevent freezing of the draining wax - Release of furnace heating only possible after drain temperature is reached, to prevent clogging
Stainless steel floor pan with grid bottom for level loading
Rugged self-supporting, vaulted arch construction
Exhaust gas vent in furnace ceiling for connection with ductwork (starting with N 440 manual exhaust air flap)
Air inlet openings for reliable air exchange
Dual shell furnace housing for low exterior temperatures
Removable base included in delivery (fixed base for models N 440 and larger)
First over-temperature limiter which must be set below the ignition point of the wax and prevents the wax from igniting during dewaxing. It is customers responsibility to set the required time interwal for dewaxing. After this time has elapsed the over-temperature limiter will be deactivated to make sure that the furnace can continue with the sintering process.
Second 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