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.
Claims9
A process for producing a man-made cellulosic molded body using a reclaimed man-made cellulosic raw material and a virgin cellulosic raw material, including the steps of
- a) optionally mechanically shredding of the reclaimed man-made cellulosic raw material,
- b) optionally pre-treating the reclaimed man-made cellulosic raw material in a metal removing stage, a decoloring stage and/or cross linker removing stage prior to the alkalization step,
- c) in an alkalization stage steeping the reclaimed man-made cellulosic raw material in caustic soda and subsequently squeezing,
- d) optionally pre-aging the thus obtained alkali cellulose,
- e) xanthation of the alkali cellulose in a xanthation step and subsequently dissolution of the cellulose xanthate,
- f) extruding the cellulose xanthate solution thus obtained to form a molded body,
- g) coagulating and regenerating the cellulose to obtain the man-made cellulosic molded body,
- wherein before step e) 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 e).
Dependencies are inferred from the claim text.