Extrusion method

A cellulose, solution technology, applied in the field of extrusion, can solve the problem of not providing pressure

Active Publication Date: 2014-04-30
AUROTECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Example 1: Analysis of Conditions in the Air Gap

[0056] A spinning solution (cellulose: 12.9%, NMMO 76.3%, water 10.8%, all % is % by weight), wherein the cellulose (polymer) is dissolved in a concentrated solvent to form a polymer material. During this solution production process under negative pressure, NMMO, NMM (N-methylmorpholine = decomposition products of NMMO) and M (morpholine = decomposition products of NMMO and NMM, NMMO = N-methylmorpholine = NMMO morpholine-N-oxide), and water can be separated through the gas phase during the evaporation step.

[0057] The spinning process leads to expansion and evaporation caused by the extrusion of the spinning material, because the spinning material fed to the extrusion nozzle is under the appropriate conveying and extrusion pressure. The pressure is reduced to the ambient pressure of the system. Spinning pressures of up to 250 bar are commonly used in the spinning process, depending on the composition (cellulose co...

Embodiment 2

[0080] Example 2: Polymer swelling effect at different pressures

[0081] Flash evaporation of the spinning material occurs at the boiling point, at least for the aqueous content of the preheated spinning solution, due to the reduced pressure during the extrusion process.

[0082] Based on the test results it was assumed that at least some segregation or separation of the homogeneous mixed phase occurred at the surface of the polymer solution (extrudate surface) due to the pressure release caused by the swelling of the polymer during the spinning process. Formation of two heterogeneous mixed phases, in particular the formation of an extrudate core formed from a homogeneous mixture of cellulose / amine oxide / water and from enriched amine oxide and water (e.g. in the form of water of crystallization and / or with heat Water vapor mixed with decomposition products (from amine oxide = NMM (N-methylmorpholine, M = morpholine)) forms the surface of the extrudate. This segregation may c...

Embodiment 3

[0096] Embodiment 3: spinning equipment

[0097] NMMO spinning material consisting of a mixture of MoDo Crown Dissolving-DP510-550 and Sappi Saiccor DP560-580 type pulp is continuously produced according to the following composition: cellulose 12.9%, amine oxide (NMMO=N-methylmorpholine- N-oxide) 76.3%, water 10.8%.

[0098] The solution was produced after hydroenzymatic pretreatment and production of the suspension by evaporating off excess water under vacuum at a temperature of 97°C to 103°C in a continuous flow reactor. Known stabilizers were added to stabilize the NMMO / water solvent. Cellulose solutions are stabilized by propyl gallate in alkaline spinning materials and solvents, as known. For the safe production of solutions, it is advantageous to control the heavy metal ion content and the value of the cumulative parameter (metal ions and non-ferrous metal ions) does not exceed 10 ppm. Preferably, pulp with a cellulose alpha (alpha) content greater than 90% is used fo...

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Abstract

The invention relates to a method for producing solid cellulose filaments or films from a solution of cellulose, NMMO (N-methylmorpholine-N-oxide) and water, by pressure-extruding the solution by means of one or more extrusion openings and by solidifying the filaments or films in a precipitation bath. The solution is guided between the extrusion opening and the precipitation bath by an air gap, the temperature of the solution on the extrusion opening being lower than 105 DEG C and the pressure difference in the air gap between the pressure of the solution immediately prior to extrusion and after extrusion is between 8 und 40 bar.

Description

technical field [0001] The present invention relates to extrusion methods, in particular for polymer solution or polymer fluid shaping. Background technique [0002] Cellulose and other polymers can be dissolved in appropriate solvents and converted by controlled coagulation into desired shaped articles. If the shaped article consists of fibers, fibrils, etc., mention may also be made of a spinning process. Cellulose is dissolved, for example, in aqueous solutions of amine oxides, especially N-methylmorpholine-N-oxide (NMMO), to produce spinning products such as filaments, staples, Long and short fibers, films, etc. This is produced by precipitating the extrudate in water or a dilute amine oxide solution as soon as the extrudate of the extrusion head is introduced into the precipitation bath through an air gap. [0003] US4416698 relates to extrusion or spinning processes for cellulose solutions to form cellulose into fibers. In this case, the fluid spinning material (a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/06D01F2/00C08J3/09C08J5/18B29C48/05B29C48/08B29C48/345B29C48/92
CPCB29C47/864B29K2001/00D01F2/00C08J2301/02B29C47/0004B29C47/0021B29C47/92B29C2947/92514C08J3/096B29C2947/92704C08J5/18B29C47/862B29C47/30D01D5/06B29C47/0076B29C47/009B29C47/0014B29C47/8895B29C48/1472B29C48/05B29C48/08B29C48/022B29C48/87B29C48/92B29C48/345B29C48/865B29C48/919B29C48/142B29C48/872B29C48/917B29C2948/92514B29C2948/92704D04H3/013D04H3/16B29C48/30D01D5/088D01D10/02D01D10/06D01D5/084B29K2105/0073B29L2007/00B29L2031/726B29L2031/731D10B2201/22
Inventor S·济凯利F·埃克
Owner AUROTECH GMBH
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