Carbon Fiber

Efficient Production of High-Grade Carbon Fibers

Process diagram of a complete carbon fiber line

With well-founded process know-how our engineers are consistently working on the optimization of the plants for manufacturing carbon fibers and on enhancing the reproducibility of the processes. ity of the processes.



From the PAN fiber to the carbon fiber

The conversion of the PAN fiber into a carbon fiber is performed in multiple thermal process steps with subsequent surface activation.

  • In the first process step, the stabilization, the fiber is oxidized at temperatures from 180 to 280 °C.
    The critical and highly exothermal reaction requires a precise process control in terms of temperature and air flow. This is decisive for the later quality of the carbon fiber.
  • The second step , the carbonisation, is usually performed in a two-stage process in an inert atmosphere at temperatures of up to 1000 °C in the LT oven (low temperature) or 1800 °C in the HT oven (high temperature).
  • The carbonisation is followed by an electrolytic surface treatment and a sizing application.

Pollutants released during the conversion process are removed in corresponding exhaust air treatment systems.

R&D oven

R&D oven in our technology centerThe basis of cost-efficient carbon fiber production is a stable process control close to the limits. With the R&D oven in the technology center in Holzgerlingen, Germany, Eisenmann provides extensive options for testing.

The R&D oven, which is equipped with various air flow systems, offers our customers the possibility to identify process parameters as early as in the planning phase and determine the optimum air flow concept for their precursor together with us.