Recycling of man-made cellulosic fibers
AssigneeLenzing Aktiengesellschaft
InventorChristian Sperger
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Abstract
A process for producing a man-made cellulosic molded body using a man-made cellulosic raw material, including the steps of forming a cellulose solution by dissolution of cellulosic raw material, the extrusion of the cellulose solution obtained to form a molded body, and coagulation and regeneration of the cellulose to obtain the man-made cellulosic molded body, wherein the man-made cellulosic raw material is mixed with a second cellulosic raw material prior to forming the cellulose solution.
Claims15
A process for producing a man-made cellulosic molded body using a reclaimed man-made cellulosic raw material and a virgin cellulosic raw material, comprising the steps of:
- a) steeping the reclaimed man-made cellulosic raw material in caustic soda in an alkalization stage and subsequently squeezing to obtain alkali cellulose,
- b) xanthation of the alkali cellulose and subsequently dissolution of cellulose xanthate to obtain a cellulose xanthate solution,
- c) extruding the cellulose xanthate solution,
- d) coagulating and regenerating cellulose to obtain the man-made cellulosic molded body,
- wherein before step b) in an additional combination step the alkali cellulose made of the reclaimed man-made cellulosic raw material is combined with alkali cellulose made of the virgin cellulosic raw material in a second alkalization line and wherein the combined alkali celluloses are further processed jointly in the xanthation step b).
Dependencies are inferred from the claim text.