WO2023006604 - IMPROVEMENTS RELATING TO THE COLD-ALKALI PROCESS FOR THE PRODUCTION OF REGENERATED CELLULOSIC FIBERS
National phase entry:
Publication Number
WO/2023/006604
Publication Date
02.02.2023
International Application No.
PCT/EP2022/070612
International Filing Date
22.07.2022
Title **
[English]
IMPROVEMENTS RELATING TO THE COLD-ALKALI PROCESS FOR THE PRODUCTION OF REGENERATED CELLULOSIC FIBERS
[French]
AMÉLIORATIONS SE RAPPORTANT À LA TRANSFORMATION BASIQUE À FROID POUR LA PRODUCTION DE FIBRES CELLULOSIQUES RÉGÉNÉRÉES
Applicants **
LENZING AKTIENGESELLSCHAFT
Inventors
DOBSON, Peter
REDLINGER, Sigrid
Priority Data
21187686.7
26.07.2021
EP
Application details
| Total Number of Claims/PCT | * |
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International Searching Authority |
EPO
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| Recordal of a Change of the Applicant's Name/Address |
Change of Applicant's Name and Address
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| Type of Assignment |
The Standard Agent's Assignment
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| Applicant's Legal Status |
Legal Entity
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| Entry into National Phase under |
Chapter I
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| Patent Delivery |
Send the Letters Patent by Courier
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| 译文 |
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Quotation for National Phase entry
| Country | Stages | Total | |
|---|---|---|---|
| China | Filing, Examination, Granting | 2024 | |
| EPO | Filing, Examination, Granting | 8126 | |
| Japan | Filing, Examination, Granting | 2155 | |
| South Korea | Filing, Examination, Granting | 2071 | |
| USA | Filing, Examination, Granting | 4740 |
Total:
19,116
The term for entry into the National Phase has expired. This quotation is for informational purposes only
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Abstract[English]
The present disclosure relates to a method and processing facility for producing regenerated cellulosic fibers. The method comprises extruding a spinning solution into a coagulation bath which contains a salt and preferably an alkali to produce the fibers. The spinning solution comprising cellulose dissolved in an aqueous solvent comprising NaOH and ZnO. The coagulation bath has a pH-value of at least seven. The method further comprises a continuous process of applying to the fibers in a never-dried state a crosslinking agent with two or more reactive groups and heating the fibers to a curing temperature while maintaining the never-dried condition to produce a reaction between the crosslinking agent and the cellulose of the fiber.[French]
La présente invention concerne un procédé et une installation de transformation permettant de produire des fibres cellulosiques régénérées. Le procédé consiste à extruder une solution de filage dans un bain de coagulation qui contient un sel et de préférence une base pour produire les fibres. La solution de filage comprend de la cellulose dissoute dans un solvant aqueux contenant du NaOH et du ZnO. Le bain de coagulation a une valeur de pH supérieure ou égale à sept. Le procédé comprend en outre un processus continu d'application aux fibres, dans un état jamais sec, d'un agent de réticulation comportant deux groupes réactifs ou plus, et de chauffage des fibres à une température de durcissement tout en maintenant l'état jamais sec pour produire une réaction entre l'agent de réticulation et la cellulose de la fibre.