A production process for regenerated cellulose fibres based on the cellulose carbamate process without the use of sulphur or heavy metals: Optimisation and upscaling of cellulose carbamate synthesis using the DITF process and textile processing of the carbamate fibres (Part 3)

The newly developed process has economic advantages, in addition to being more environmentally compatible. The carbamate spun fibres can be used in their pure form or as a mixture. The achievable fibre properties could mean enhanced economic advantages for the German fibre and textile industry.

The cellulose carbamate process was developed as an alternative to the environmentally harmful viscose process, within the framework of a joint project. 
The aim of this sub-project was to upscale the synthesis and textile processing of carbamate fibres and textiles to determine their refinement potential. 
Results: 

• Cellulose carbamate synthesis using the DITF process was optimised and extended with regard to the quantity of cellulose carbamate produced, i.e. an increase to 10 kg per batch. The quality of the result of the synthesis process was constant, which is of importance for upscaling to industrial use. 
• Spinning tests and the mechanical properties of the fibres produced showed that the optimised process could readily result in a quality of cellulose carbamate that is suitable for further processing. 
• With regard to the refinement properties and the property spectrum of the fibres, it became clear that the newly developed carbamate spinning fibres have excellent colouring properties - far better than conventional viscose fibres - and are also colourfast. Particular note should be taken of the high level of bath throughput, the potential reduction of quantities of salts required during colouring and the brilliant resultant colours, so that very high-grade textiles can be produced. 
• There is a wide range of possible applications for the carbamate spun fibres. The fibres can be used in their pure form, but also in mixtures, for example for linings, outerwear and underwear, sewing threads, car seat covers, base textiles and fleeces. 

The final report (call number F 04 B 598, in German) can be borrowed from:  
Technische Informationsbibliothek (TIB) Hannover  
Welfengarten 1B 
30167 Hannover





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