Industrial furnaces
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.

Process

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

Roller Hearth Kiln from ONEJOON

Advantages at a glance

  • flexible furnace technology for a wide range of products and requirements
  • maximum flexibility for further development of the furnace curve 
  • combination of different atmospheres in one furnace
  • highest temperature homogeneity (with single-layer stack construction)
  • extreme reduction of the furnace times
  • extreme heating and cooling rates
  • optimum debinding with process gas circulation up to 800°C
  • gas or electric heating

Technical highlights:

  • separate process gas injection and extraction per segment or zone
  • process gas circulation up to 800 °C (debinding)
  • double gate sluice in the hot for perfect atmosphere separation
  • vacuum double gate sluice for inlet and outlet with up to 80% process gas savings compared to a single gate airlock
  • gastight furnace body
  • schroff cooling
  • integrated safety fence
  • CFD simulation for process optimization 
Services

Our services

Consulting, service, furnace construction and much more.
Just because every customer has special requirements.

Together with you, we will work out the optimal solution for your request.

  • definition of the scope of delivery
  • design of the system based on your specifications
  • configuration of the system from standardised components, customer-specific adaptations
  • presentation of the plant concept
  • preparation of the offer
  • design, production and testing of the system in our factory
  • shipping, assembly, commissioning and acceptance of the plant at your location around the globe
  • preparation of the plant documentation and the CE declaration of conformity
  • production support
  • services: plant maintenance, spare parts, repairs, measurements
  • network to adjacent processes

We are looking forward to your request, contact us today!

References

Our references

Satisfied customers through successful and long-standing partnerships

Our reference list of thin-film ceramics, cathode powder, filter ceramics, powder metallurgy and many other products shows the reliability and production safety of ONEJOON Roller Hearth Kilns.

Debinding & sintering of thin-film

Dates & Facts

  • customer: American manufacturer
  • product: thin-film ceramics
  • system: Roller Hearth Furnace
  • year of manufacture: 2020
  • scope of delivery: plant design, engineering, construction, construction, installation at the customer's site, commissioning, process support and process consulting
Calcine active cathode powder

Dates & Facts

  • customer: Korean manufacturer
  • product: Cathode active material (CAM)
  • system: Roller Hearth Furnace
  • scope of delivery: plant design, engineering, construction, installation at the customer's site, commissioning, process support and process consulting
Referenzofen Cathodenaktivpulver Kalzinieren 640x360
Debinding filter ceramics

Dates & Facts

  • customer: Asian manufacturer
  • product: Ceramic filters
  • system: Roller Hearth Furnace
  • number of pieces: >20 furnaces at different locations
  • scope of delivery: plant design, engineering, construction, construction, installation at the customer's site, commissioning, long-term service contracts
Debinding and sintering of powder metals

Dates & Facts

  • customer: Various European manufacturers
  • product: Powder metal components
  • system: Roller Hearth Furnace
  • number of pieces: >10 furnaces at different locations at different customers
  • scope of delivery: plant design, engineering, construction, construction, installation at the customer's site, commissioning, long-term service contracts
ONEJOON Service Technischer Support Grafik 840x560
Services
Our service portfolio
in detail
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Zahnraeder Als Illustration Produktentwicklung Und Test 420x280
Test Center
Development and optimisation of heat treatment processes read more
Onejoon Simulation Teaser 420x280
CFD-Simulation
Sophisticated furnace solutions with the aid of CFD simulations read more
Heat treatment plants

More than 120 years experience in industrial furnace construction

Wolfgang Touschek
Key Account Manager Sales
+49 7031 78 - 13 11
roller-hearth-kiln@onejoon.de
Contact
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