Industrial furnaces ONEJOON Roller Hearth Kiln For maximum flexibility in the continuous process

Roller Hearth Kiln

Flexible furnace technology for thin-film ceramics, cathode active powder, filter ceramics, powder metals and much more!

The ONEJOON Roller Hearth Kiln has a wide range of applications. It covers all requirements from the debinding and sintering of thin-film ceramics, filigree filter ceramics and powder metallurgy to the calcination of cathode active powder as well as other powders and products.

This also shows the great flexibility of the roller hearth furnace, which is particularly reflected in the further development of the furnace curve. Due to the high variety of products, the Roller Hearth Kiln is also very flexible with regard to the furnace atmosphere. From oxidizing / reducing, various process gases such as N₂ / H₂ to vacuums, anything is possible. Furthermore, different atmospheres can also be combined in one furnace. In extreme cases it is even possible to create a separate atmosphere for each control zone.

Due to the highest temperature homogeneity with single-layer stack construction compared to other continuous furnace types, the treatment time of your products can be drastically reduced with this furnace construction. But for high pile constructions, too, the roller kiln offers excellent temperature homogeneity up to 800 °C, especially for debinding with its optional air circulation system.

With a single-layer product stack, extreme heating and cooling rates can be achieved due to the homogeneous heating and cooling, as long as the product cooperates. For example: With a shot cooling zone for powder metals, cooling from 900 °C to 200 °C (delta T = 700 °C) can be achieved within only 2 minutes.

The ONEJOON Roller Hearth Kiln can also be heated with gas or electrically. That means that we offer full flexibility in this area, too.

Processes of Roller Hearth Kiln

With ONEJOON Roller Hearth Kilns different processes can be mapped.

These include, for example

Plant engineering

The Roller Hearth Kiln in detail

Suitable rollers for every requirement
- mullite rolls (Al2O3+SiO2) for low heat losses
- SiC rolls for high load
- RSiC rollers for thermal shock at high temperatures
- SiSiC rollers for aggressive atmospheres
- Steel rollers for cooling
Atmosphere under control
- media station for central operation
- accurate atmosphere control per segment / per zone possible
- homogeneous flow through the furnace chamber from bottom to top (injection at the bottom, extraction at the top)
- atmosphere combinations in the furnace by individual injection per segment / per zone in combination with separating weirs or sluices
- process gas preheating possible
Perfect temperature homogeneity with separate control
- separate control of the heating elements above and below the rollers for perfect temperature homogeneity
- power reserve, also for steep ramps
- alternative heating: indirect or direct gas heating
Flexible separating weirs
- easy separation of atmospheres
- separation of temperature zones
- flexible clearance heights due to modular partition weirs possible
Holistic extraction and exhaust air system
- homogeneous flow through the furnace chamber from bottom to top (injection at the bottom, extraction at the top)
- pipeline design
- integration of combustion chamber / TNV / RNV or further exhaust aftertreatment steps
Keep your atmosphere inside
- minimal atmospheric loss (excessive pressure) or contamination (negative pressure) due to hall air
- optimised atmosphere control and reduced consumption
Maximum security
- hot surfaces are shielded by the covers
- easy access for service work
- window for optical controls
Furnace circulation as buffer and for convenient loading and unloading
- use return line as product storage
- flexible definition of loading and unloading areas and positions
- full automation with multi-axis robot arm possible
Perfect atmosphere separation in hot applications
- double sluice gate in the hot zone to separate different furnace atmospheres
- e. g. separation of debinding and sintering areas
- e. g. separation of the sintering area from the shot cooling
Homogeneous debinding up to 800 °C
- maximum temperature and atmospheric homogeneity for high stacking
- gas or electrically heated
Extremely fast and homogeneous cooling to achieve special product properties
- cooling from 900°C to 200°C in only 2 min
- cooling with furnace atmosphere via heat exchanger system
- very homogeneous process gas flow
- perfect individual adaptation to the customer product with CFD simulation
Sluices with and without vacuum
- safe separation of furnace atmosphere and hall air
- gas tight and corrosion resistant
- robust and contamination-free
- perfect atmosphere change in the shortest time
- double gate lock in the hot to separate atmospheres e. g. debinding and sintering atmosphere