Like the bogie hearth furnace, the top hat and bottom loading furnaces will be equipped with a safety system for debinding in air to allow for a safe operation of debinding and sintering processes performed in one step. Based on the dilution principle, fresh air will be supplied to the furnace chamber in a controlled way to reliably prevent a combustible atmosphere forming inside the furnace by the exhaust gases evaporating from the charge. In addition, debinding-related functions will be monitored to protect the operator and the surrounding.
For small amounts of binder, the basic versions of the combi top hat and bottom loading furnaces are equipped with the DB100 debinding package. With this package, pre-heated fresh air is blown into the furnace so that the combi bogie hearth furnace is operated with overpressure during the debinding phase.
The DB200 debinding package is used for alternating debinding processes and/or large amounts of binder. Like the DB100 debinding package, preheated fresh air is supplied to the furnace chamber via a fresh air fan with air preheater. The furnace also has an exhaust gas fan, which removes the exhaust gases from the furnace via a separate outlet during debinding. For this purpose, the flow rates of the fresh air and exhaust gas are coordinated to ensure that there is always a slight underpressure in the furnace chamber during debinding.