Continuous furnace

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A continuous furnace , also known as tunnel furnace , is a special furnace design in which charging takes place continuously. Continuous ovens can, for. B. be used for heating, keeping warm, homogenizing or for heat treatment of the goods. In the German porcelain industry , tunnel ovens, although known for a long time, were not used until 1906, first at Carl Tielsch , then also at Kahla .

functionality

In the continuous furnace, the material to be heated is continuously moved in the furnace. It can lie or stand on a conveyor or be transported through the conveyor furnace while hanging. After the product has passed the inlet side of the furnace, it is constantly exposed to a predefined temperature profile. In the case of continuous ovens, panels at the entrance and exit ensure that only little heat can escape and that much energy loss is avoided. The runs are controlled with control devices and take place automatically after the goods have passed the furnace entrance. After the end of the tempering process , the goods can be removed from the delivery side of the conveyor belt. Loading and unloading is particularly easy if the continuous furnace is operated with a drive-in trolley. Conveyor belts can be implemented in various designs in the continuous furnace: with crossbar construction, wire mesh, plastic belts or simple chain transport.

Types

View into a drive-through furnace

Continuous ovens are available with electric or gas heating as drive-through ovens, pusher ovens, chain ovens, walking beam ovens, conveyor belt ovens and roller ovens.

Performance characteristics

Continuous ovens are universally usable oven types with freely selectable belt speeds. They are available with automatic timing, and a division into several zones (heating, heating, cooling) is possible. Optimal temperature distribution is achieved through multi-zone control, conveyor ovens deliver excellent heat treatment results.

Applications

Continuous ovens are used for hardening, firing and sintering thick films, electrodes or discrete, electronic components, for tempering , drying or hardening of sealants or plastics, for soldering , brazing or leveling solder, for firing ceramic products and for annealing steel strips as well as for Baking used.

Special, particularly clean versions (based on particles) are used in the production of flat screens .

Individual evidence

1. ↑ Sabine Zehentmeier: Life and Work of Porcelain Manufacturers in Northeast Bavaria (1870-1933) , Hohenberg / Eger 2001 (University of Bamberg, diss.), P. 80.