2-Muffle Pull-Through Furnace

for carbonizing synthetic fibre

Technical Data

Furnace designation:

electrically heated 2-muffle pull-through furnace

Rated furnace temperature:

1,000 ° C

Transversal temperature tolerance: +/- 3 K over the muffle width:

+/- 3 K over the muffle width

Protective gas:

inert gas (e.g. nitrogen)

Oxygen content in the muffle:

< 10 ppm

Rated power of heating:

1,000 KW

Number of heating zones:

8

Furnace dimensions:

length: 25,000 mm / width: 6.000 mm

Furnace Description

For carbonizing of synthetic fibre Ruhstrat delivered an electrically heated industrial furnace with 2 gastight muffles of about 20 m length. These industrial furnace plant serves to produce carbon fibre.

Precursors are e.g. polyacrylics, cellulose or pitch in different textile forms (yarn, felt, fleece, tows, etc.) which are coated with phenolic or furanic resin, for example. This precursor floats through the furnace by means of a special transport technology or it is run through on supports.

The carbonization furnace is designed for a temperature of max. 1000°C. Each heating zone is equipped with a hot gas ventilator. This leads to a very high transversal temperature uniformity over the complete muffle width.

The muffles are welded in a gastight way and equipped with a newly developed muffle bearing. Inside the muffles there is inert gas. Unburnt gas is led into and out of the muffle at different positions. At the inlet and outlet of the muffles there are purging sections, designed especially for this process. The oxygen content in the furnace is almost zero, due to the design.

The carbonization furnace is part of a complete production line. After the carbonization furnace there can be a graphitizing furnace (high temperature furnace) – depending on the product requirements – which is also manufactured and delivered by Ruhstrat.

The industrial furnace plant is controlled by a Ruhstrat PLC system control that is integrated into the process control system of the complete plant of the end customer.