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Rayon Production Process

Our reinforcing yarns for tires, rubber goods applications and other composites are produced from high-purity pulp.

In a complex, multi-stage production process, the natural raw material cellulose is transformed into a high-tenacity multifilament yarn for technical applications.

The main steps of the process are:

Viscose preparation
Viscose preparation
The pulp is dissolved with the addition of sodium hydroxide and carbon disulfide. After ripening, filtration and degassing, the solution is ready for spinning.

Spinning
Spinning
The viscose is pumped through spinnerets into the spin bath, where the cellulose precipitates and forms the yarn. After stretching, fixation and washing, the yarn is wound into wet bobbins.

Textile after treatment
Textile after treatment
The wet bobbins are put into a creel, from which the yarns are pulled off. After passing the washing- and the sizing section, they are dried and wound into bobbins of 4 or 10 kg. The 4 kg bobbins get a Z100 protection twist. Finally, all bobbins are sorted and packed on pallets for dispatch.

Spin bath recovery
Spin bath recovery
The main circuit supplies fresh spin bath to the spinnery, gathers the used stream and – after filtration, the addition of sulphuric acid and reheating – returns it to the spinnery. The recovery sub-circuit removes excess water by means of evaporation and excess sodium sulfate by means of crystallization and calcination.

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