Industrial furnaces
Industrial furnaces ONEJOON Lift Bottom Kiln

For the highest demands in terms of
temperature homogeneity in batch processes

Lift Bottom Kiln

Discontinuous furnace technology for advanced ceramics

scalable to any customer requirement

The lift bottom kiln ONEJOON is the ideal solution for processes with debinding steps and a very high demand placed on temperature homogeneity. It enables the fully automatic and controllable treatment of workpieces under different sequential atmospheric conditions and temperatures. This is of particular benefit to users who produce various product batches using different firing curves and atmospheres.

The lift bottom kiln clearly demonstrates its advantages when the production capacity of each individual batch is too small for a continuous furnace. On the other hand it is possible to install several lift bottom kilns in one line, which are fed by a common conveyor system. This leads to a high degree of flexibility and helps to optimise production planning. The floor loading concept thus enables extremely compact plant layouts.

Process

Processes of Lift Bottom Kiln

With ONEJOON Lift Bottom Kilns different processes can be mapped.

These include, for example:

Plant engineering

The lift bottom kiln in detail (electrically heated)

Industrial furnace for the heat treatment of advanced ceramics

  • Benefits of convective heat transfer

    • gas-tight hot gas fan
    • recirculation mode for maximum energy efficiency

    Safety is our top priority: All our plants are constructed according to the Machinery Directive

  • Full power up to 1500 °C with silicon carbide (SiC) heating elements

    • maximum temperature homogeneity
    • power reserve – including for steep ramps

    With gas heating, temperatures up to 1650 °C are possible

  • Integration into your production

    • pipeline design
    • integration of TNV / RNV or further exhaust post-treatment steps
  • Do not lose time during loading and unloading

    • fast loading and unloading times due to the use of several furnace floors

    Tailor-made solutions from ONEJOON: from the manual loading of a single furnace to a fully automated system for up to 10 plants

  • Full cooling power to reduce the cycle time

    • additional cooling chamber with increased cooling capacity
    • reduction of the total cycle time by up to 30%

    Fully automatic connection through the automatic lifting portal

System description

How the lift bottom kiln works

The correct heat treatment of high-performance ceramics

The fill structure loaded with the products to be manufactured is transported to the furnace floor and lifted upwards via a lifting portal. As soon as the floor has reached its position under the furnace, both are locked together. To prevent heat from escaping and, at the same time, ensure a gas-tight seal, a floating seal with spring-loaded elements is used. The lifting portal is then used for loading and unloading other parallel furnaces.

During the debinding phase (up to 500 °C), the furnace load is heated by circulating hot air, which has previously been preheated by an external heater. The waste gas contaminated with the binder is cleaned in a thermal afterburning

plant. At the end of the debinding phase, further heating is carried out by electrical heating elements in the furnace.

The process gas can also be kept in circulation at elevated temperatures up to 800 °C. This contributes to optimum temperature homogeneity during the heating process. The circulation of the process gas ends at temperatures above 800 °C.

Also in the subsequent process steps, no gas or air circulation takes place until the maximum temperature is reached. This is because turbulence in the furnace atmosphere is often very critical for sintering and crystallisation processes. At the end of the process, the workpieces are cooled with tempered air or gas. For this purpose, an external heating system regulates the temperature of the cooling medium in advance before it reaches the product carriers

and the products. After cooling down to approx. 250 °C, the furnace floor is transferred from the lifting portal to a cooling chamber where the products are finally cooled down to room temperature.

Advantages at a glance:

  • excellent temperature homogeneity
  • optimised cycle times
  • low spatial requirement, compact layout
  • flexible production planning
  • easily scalable
  • maximum energy efficiency
  • very high heating rates
  • highest temperature homogeneity
  • process gas circulation up to 800 °C
  • high-temperature sintering up to 1650 °C
  • gas or electric heating

Technical highlights:

  • furnace bottom spring seal
  • SiC airflow blinds
  • preheated circulating air
  • additional final cooling chamber
  • safety concept with emergency N2 flushing system
  • CFD simulation to optimise the air flow
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 numerous customers from the medical ceramics and automotive industries confirm the reliability and production safety of our industrial furnaces.

Lift Bottom Kiln for sintering oxide ceramics

Dates & Facts

  • customer: German manufacturer of ceramic sensor elements for the automotive industry
  • product: measuring probes for exhaust and engine control
  • system: Lift Bottom Kiln, TNV, cooling furnaces, automatic lifting portal for complete automation, software
  • year of construction: since 2000
  • number of pieces: approx. 30 furnaces at different locations
  • special features: floating furnace bottom seal
  • scope of delivery: plant layout, engineering, design, construction, installation at the customer's site, commissioning, long-term service contracts
ONEJOON Service Technischer Support Grafik 840x560
Services
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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 2 38 09 - 13 11 lift-bottom-kiln@onejoon.de
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