Details

---

The hot-wall retort furnaces are ideal for heat treatment processes that require a defined process gas atmosphere. The furnace chamber consists of a gas tight retort. 

Equipped with the corresponding safety technology, these retort furnaces are suitable for catalytic (CDB) and also thermal (IDB, H2) debinding of MIM components. 

Hot-Wall Retort Furnace for Catalytic Debinding (CDB) 

The hot-wall retort furnaces NRA .. CDB were developed especially for catalytic debinding of ceramic and metal powder injection molding components. They are equipped with an internally-heated gas tight retort.  

The catalytic debinding furnaces are designed and built so that the nitric acid is fed into the furnace by means of an acid pump where it evaporates and is distributed evenly throughout the furnace chamber through the atmosphere circulation. The evaporated nitric acid debinds the components by chemically decomposing the polyoxymethylene-based binder (POM) to form formaldehyde. To minimize emissions to the atmosphere, the furnace is equipped with a thermal post-combustion system. Formation of explosive gas mixtures is prevented with monitored flow of the nitric acid and a constant, monitored flow of nitrogen. The design and construction of the furnace with gas tight retort ensures that no oxygen can enter. The door is kept closed during the entire debinding process. 

• Safety package for safe operation with nitric acid 
• PLC process control with safety monitoring (F-PLC) and graphic touch panel  
• Retort made of acid-resistant stainless steel 1.4571 with swing door 
• Heating inside the retort via chrome steel tubular heating elements 
• Horizontal circulation for even distribution of the process atmosphere 
• Acid pump in separate cabinet 
• Gas-fired exhaust gas torch with flame monitoring

Model	Volume	Work space in mm			Quantity	Number of Shelves 170 x 250 mm	Shelves Work space	Outer dimensions in mm			Weight	Heating power
	in l	w	d	h	Levels	total (level)	in m²	W	D	H1	in kg	in kW
NRA 40 CDB	40	340	500	240	6	24 (2x2)	1	1400	1700	2400	1000	2
NRA 80 CDB	80	340	750	320	8	48 (2x3)	2	1600	2000	2500	1200	13
NRA 160 CDB	160	500	680	480	12	96 (2x4)	4	1800	2200	2600	1600	20
NRA 320 CDB	320	680	750	640	16	192 (4x3)	8	2300	2400	2800	2800	35
1Including exhaust gas torch