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Process for the production of a cellulosic fiber from a solution of cellulose in a tertiary amine-oxide and device for carrying out said process

A technology of cellulose solution and tertiary amine oxide, applied in the direction of single-component cellulose rayon, fiber chemical characteristics, textiles and papermaking, etc., can solve the problem of increasing fiber production costs, reducing equipment output, and unable to start the spinning process And other issues

Inactive Publication Date: 2011-05-18
LENZING AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, a lower number of openings reduces the equipment throughput and therefore increases the production cost of the fibers
[0007] According to the state of the art, the spinning process cannot be started without manual intervention after machine maintenance or automatic shutdown

Method used

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  • Process for the production of a cellulosic fiber from a solution of cellulose in a tertiary amine-oxide and device for carrying out said process
  • Process for the production of a cellulosic fiber from a solution of cellulose in a tertiary amine-oxide and device for carrying out said process

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Embodiment Construction

[0041] The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown.

[0042]The process of producing cellulose fibers from cellulose solutions in tertiary amine oxides by the spray-wet process generally includes several steps that have a significant effect on the structure and texture of the filaments. A first embodiment of an apparatus 1 suitable for carrying out the process is shown in Figure 1A. First, the cellulose solution is extruded through a spinneret (not shown), which may include one or more openings arranged in various configurations, such as one or more circular holes, and the like. Alternatively, the spinneret is a rectangular spinneret for spinning the filaments into a curtain form.

[0043] The filaments 2 thus obtained are guided through the air gap 3 between the spinneret and the vessel 4 containing the precipitation bath. While passing through the air g...

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Abstract

A process for the production of a cellulosic fiber from a solution of cellulose in a tertiary amine-oxide via a jet-wet process according to the present invention comprises the steps of pressing the solution of cellulose through a spinneret, thereby obtaining filaments, conducting the filaments through an air gap into a container containing a precipitation bath, drawing the filaments in the air gap, transporting the filaments out of the precipitation bath, further processing of the filaments, wherein drawing of the filaments is performed via a mechanically driven drawing-off device exerting adrawing force and at least part of the drawing force is transmitted onto the filaments by contacting the filaments with the drawing-off device at a location within the precipitation bath.

Description

technical field [0001] The invention relates to a process for producing cellulose fibers from a cellulose solution in a tertiary amine oxide according to claim 1 and to an apparatus for carrying out the process according to claim 12 . Background technique [0002] In recent years, various processes have been developed for the production of cellulose fibers in a mixture of organic solvents and water. Cellulose fibers produced with such solutions are called Lyocell fibers. Currently the only profitable process to obtain Lyocell fibers is production with tertiary amine oxide solvents, in particular N-methylmorpholine-N-oxide (NMMO). Fibers produced by this process are characterized by high tenacity, high wet modulus and enhanced hook strength and are known as the "amine oxide process". [0003] From US4246221 is known a solution comprising cellulose dissolved in a tertiary amine N-oxide solvent, containing a non-solvent for the cellulose such as water, shaped by extrusion or ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/06D01F2/00
CPCD01D5/16D01F2/00
Inventor C·施雷姆普夫H·鲁夫H·菲尔戈G·格贝茨伯格
Owner LENZING AG
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