摘要:
There is provided a process for chemically pretreating reclaimed cellulose fibres to be used in the production of moulded bodies from regenerated cellulose, wherein the pretreatment includes one stage, in which stage acid metal removal and acid oxidative bleaching are carried out together. Advantages include that the propensity of the regenerated cellulose to clog when flowing in a tube and through a nozzle is reduced. This is believed to be an effect of an efficient metal removal. The need for additional bleaching steps and/or metal removing steps is reduced or even eliminated. A one-stage method is more efficient, faster and less costly compared to a multi-stage method according to the prior art. From an environmental perspective, acidic metal removal is preferred over removal by chelating agents such as EDTA.
摘要:
Ein Verfahren zum Herstellen eines Cellulose aufweisenden Formkörpers (102), wobei das Verfahren aufweist: i) Bereitstellen (78) eines Ausgangsstoffs (110), welcher Cellulose und Elastan aufweist, insbesondere wobei das Elastan in dem Ausgangsstoff (110) separat von der Cellulose vorliegt, wobei der Ausgangsstoff (110) ein Festkörper ist, und ii) Erzeugen (80) des Cellulose aufweisenden Formkörpers (102), insbesondere mittels eines Lyocell-Verfahrens oder eines Viskose-Verfahrens, auf Basis des Ausgangsstoffs (110) derart, dass der regenerierte cellulosische Formkörper (112) zumindest einen Teil des Elastans des Ausgangsstoffs (110) aufweist. Hierbei ist der Teil des Elastans des Ausgangsstoffs (110) in dem regenerierten cellulosischen Formkörper (102) inkorporiert. Ferner ein regenerierter cellulosischer Formkörper (102), welcher in der Cellulose inkorporiertes Elastan aufweist, und welcher nach einem Lyocell-Verfahren oder einem Viskose-Verfahren hergestellt ist.
摘要:
The present invention relates to a method of pulping cotton-based raw material for producing dissolving pulp. More specifically, the invention relates to a process for producing dissolving pulp under alkaline conditions in combination with a gaseous oxidizing agent. The present invention further relates to dissolving pulp obtainable by pulping cotton-based raw material, in particular dissolving pulp obtainable by the method of the present invention, the use of such dissolving pulp for producing regenerated cellulose molded bodies, and methods of producing lyocell or viscose including such dissolving pulp.
摘要:
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.
摘要:
The invention relates to high-strength, inter alia pigment-containing, for example flame-retardant, regenerated cellulosic filaments having improved textile properties, in particular in respect of strength and uniformity. The invention also relates to the use of said filaments for producing sheet material and to a method for producing said filaments.