EP0731856B1 - Process for the preparation of cellulose fibres - Google Patents
Process for the preparation of cellulose fibres Download PDFInfo
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- EP0731856B1 EP0731856B1 EP95922339A EP95922339A EP0731856B1 EP 0731856 B1 EP0731856 B1 EP 0731856B1 EP 95922339 A EP95922339 A EP 95922339A EP 95922339 A EP95922339 A EP 95922339A EP 0731856 B1 EP0731856 B1 EP 0731856B1
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- Prior art keywords
- air gap
- extruded
- process according
- cellulose
- filaments
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/06—Wet spinning methods
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
- D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
Definitions
- the present invention relates to a process for the production of cellulose fibers, wherein a solution of cellulose in an essentially aqueous tertiary amine oxide is extruded into filaments through spinning holes in a spinneret and the extruded filaments are passed through an air gap into a precipitation bath.
- Fibrillation is understood to mean breaking open the fiber in the longitudinal direction under mechanical stress in the wet state, as a result of which the fiber is given a hairy, furry appearance.
- a fabric made and dyed from these fibers loses its color intensity over the course of a few washes.
- the cause of the fibrillation is assumed to be that the fiber consists of fibrils arranged in the direction of the fibers, between which there is only a small amount of cross-connection.
- WO 92/14871 describes a method for producing a fiber with a reduced tendency to fibrillation. This is achieved in that all baths with which the fiber comes into contact before the first drying have a pH of maximum 8.5.
- WO 92/07124 also describes a method for producing a fiber with a reduced tendency to fibrillation, according to which the undried fiber is treated with a cationic polymer.
- a polymer with imidazole and azetidine groups is mentioned as such a polymer.
- treatment with an emulsifiable polymer e.g. Polyethylene or polyvinyl acetate, or crosslinking with glyoxal.
- the present invention therefore has the object of providing a cellulose fiber of the Genus Lyocell which has a further reduced tendency to fibrillation.
- air gap means the gas space which extends between the spinneret and the precipitation bath.
- the gas in this gas space does not necessarily have to be air, but rather can be any gas or gas mixture which does not impair the spinning process.
- air gap thus includes any such gas or gas mixture in addition to air.
- the extruded filaments are blown in the air gap with a gas stream which contains the aliphatic alcohol in gaseous form.
- a gas stream which contains the aliphatic alcohol in gaseous form.
- the production of an alcohol-containing gas stream is known to the person skilled in the art and can e.g. simply by spraying the alcohol into the gas stream using an ultrasonic atomizer or by passing the gas stream through the alcohol.
- a further advantageous variant of the process according to the invention is that the solution of cellulose in an aqueous tertiary amine oxide is extruded into filaments through ring-shaped spinning holes of a spinneret, so that a ring-shaped filament curtain is passed through the air gap, and that the gas stream is in the center of the Filament curtain formed ring supplied and the filament curtain is blown radially from the inside out.
- a suitable device with which an annular filament curtain can be blown in the manner described is known from WO 93/19230.
- the temperature in the air gap is selected so that on the one hand the dew point is not fallen below, i.e. that no alcohol condenses in the air gap and on the other hand that there are no difficulties in spinning due to the temperature being too high. Values between 10 and 60 ° C can be set, with temperatures between 20 and 40 ° C being preferred.
- the warping in the air gap depends on the diameter of the nozzle hole and the concentration of cellulose in the solution when the titer of the fibers is fixed. In the range of the preferred cellulose concentration, however, this could not be influenced the fibrillation obsolescence is determined as long as one is in the area of the optimal spinning temperature.
- the friction of the fibers against one another during washing processes or during finishing processes when wet was simulated by the following test: 8 fibers were placed in a 20 ml sample vial with 4 ml of water and in a laboratory shaker type RO-10 from Gerhardt for 9 hours, Bonn (FRG) shaken at level 12. The fibrillation behavior of the fibers was then assessed under the microscope by counting the number of fibrils per 0.276 mm fiber length.
- a 12% spinning solution of sulfite and sulfate pulp (12% water, 76% NNMO) was spun at a temperature of 115 ° C.
- a melt index device from Davenport used in plastics processing was used as the spinning apparatus. This device consists of a heated, temperature-controlled cylinder into which the spinning mass is poured. By means of a piston, which is loaded with a weight, the spinning mass is passed through the spinneret attached to the underside of the cylinder extruded. This process is referred to as the dry / wet spinning process since the extruded filament is immersed in a spinning bath after it has passed through an air gap.
- the alcohol used In the table are the alcohol used, the alcohol concentration in the air gap (g / m 3 ), the Spinning mass throughput (g of spinning mass / hole / min), the length of the air gap (mm) and the number of fibrils per fiber length of 0.276 ⁇ m, which were obtained in the fibrillation test described above.
- a spinneret with circularly arranged spinning holes was used for Examples 9 to 14, so that a circular filament curtain was passed through the air gap.
- air comparative
- examples 10-14 gas containing methanol were fed into the center of the circle formed by the spinning holes and blown radially outward.
- a spinning device with which Examples 9 to 14 can be carried out is known from WO 93/19230 (FIG. 2), but the ring-shaped filament curtain was only blown radially from the inside to the outside. The rest of the procedure was analogous to the conditions of Examples 1-8.
- Table 3 shows characteristic fiber data for the fibers shown in Table 2.
- Table 3 Example No. Fiber strength cond. cN / tex Fiber elongation cond. % Fiber strength wet cN / tex Fiber stretch wet% 9 (V) 28.4 14.1 24.4 26.3 10th 29.9 17.7 27.2 25.7 11 28.7 17.8 26.8 28.1 12th 27.2 17.3 25.1 24.8 13 26.2 19.2 22.1 24.7 14 29.1 16.9 23.4 23.4
- the titers (dtex) of fibers 9, 10, 11, 12, 13 and 14 shown in Table 3 were 1.71, 1.56, 1.6, 1.62, 2.1 and 1.86, respectively.
Abstract
Description
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von Cellulosefasern, wobei eine Lösung von Cellulose in einem im wesentlichen wäßrigen tertiären Aminoxid durch Spinnlöcher einer Spinndüse zu Filamenten extrudiert und die extrudierten Filamente über einen Luftspalt in ein Fällbad geführt werden.The present invention relates to a process for the production of cellulose fibers, wherein a solution of cellulose in an essentially aqueous tertiary amine oxide is extruded into filaments through spinning holes in a spinneret and the extruded filaments are passed through an air gap into a precipitation bath.
Als Alternative zum Viskoseverfahren wurden in den letzten Jahren eine Reihe von Verfahren beschrieben, bei denen Cellulose ohne Bildung eines Derivats in einem organischen Lösungsmittel, einer Kombination eines organischen Lösungsmittels mit einem anorganischen Salz oder in wässerigen Salzlösungen gelöst wird. Cellulosefasern, die aus solchen Lösungen hergestellt werden, erhielten von der BISFA (The International Bureau for the Standardisation of man made Fibres) den Gattungsnamen Lyocell zugeteilt. Als Lyocell wird von der BISFA eine Cellulosefaser definiert, die durch ein Spinnverfahren aus einem organischen Lösungsmittel erhalten wird. Unter "organisches Lösungsmittel" wird von der BISFA ein Gemisch aus einer organischen Chemikalie und Wasser verstanden. "Lösungsmittelspinnen" soll Auflösen und Spinnen ohne Derivatisierung bedeuten.As an alternative to the viscose process, a number of processes have been described in recent years in which cellulose is dissolved in an organic solvent, a combination of an organic solvent with an inorganic salt or in aqueous salt solutions without the formation of a derivative. Cellulose fibers made from such solutions were given the generic name Lyocell by BISFA (The International Bureau for the Standardization of man made Fibers). BISFA defines a cellulose fiber as Lyocell, which is obtained from an organic solvent by a spinning process. BISFA understands "organic solvent" as a mixture of an organic chemical and water. "Solvent spinning" is intended to mean dissolving and spinning without derivatization.
Bis heute hat sich jedoch nur ein einziges Verfahren zur Herstellung einer Cellulosefaser der Gattung Lyocell bis zur industriellen Realisierung durchgesetzt. Bei diesem Verfahren wird als Lösungsmittel N-Methylmorpholin-N-oxid (NMMO) verwendet. Ein solches Verfahren ist z.B. in der US-A - 4,246,221 beschrieben und liefert Fasern, die sich durch eine hohe Festigkeit, einen hohen Naßmodul und durch eine hohe Schlingenfestigkeit auszeichnen. Ein Verfahren zur großtechnischen Herstellung spinnbarer Lösungen von Cellulose in tertiären Aminoxiden ist aus der EP-A - 0 356 419 bekannt.To date, however, only a single process for the production of a cellulose fiber of the Lyocell type has prevailed until industrial implementation. In this process, N-methylmorpholine-N-oxide (NMMO) is used as the solvent. Such a method is described, for example, in US Pat. No. 4,246,221 and provides fibers which are distinguished by a high strength, a high wet modulus and by a high loop strength. A process for the industrial production of spinnable solutions by Cellulose in tertiary amine oxides is known from EP-A - 0 356 419.
Die Brauchbarkeit von Flächengebilden, z.B. Geweben, hergestellt aus den genannten Fasern, wird jedoch durch die ausgeprägte Neigung der Fasern, im nassen Zustand zu fibrillieren, stark eingeschränkt. Unter Fibrillation wird das Aufbrechen der Faser in Längsrichtung bei mechanischer Beanspruchung im nassen Zustand verstanden, wodurch die Faser ein haariges, pelziges Aussehen erhält. Ein aus diesen Fasern hergestelltes und gefärbtes Gewebe verliert im Laufe einiger Wäschen stark an Farbintensität. Dazu kommt noch, daß sich an Scheuer- und Knitterkanten helle Streifen ausbilden. Als Ursache für die Fibrillation wird angenommen, daß die Faser aus in Faserrichtung angeordneten Fibrillen besteht, zwischen denen nur in geringem Ausmaß eine Querverbindung vorhanden ist.The utility of fabrics, e.g. However, fabrics made from the fibers mentioned are severely restricted by the pronounced tendency of the fibers to fibrillate when wet. Fibrillation is understood to mean breaking open the fiber in the longitudinal direction under mechanical stress in the wet state, as a result of which the fiber is given a hairy, furry appearance. A fabric made and dyed from these fibers loses its color intensity over the course of a few washes. In addition, there are bright stripes on the scuffed and crease edges. The cause of the fibrillation is assumed to be that the fiber consists of fibrils arranged in the direction of the fibers, between which there is only a small amount of cross-connection.
Die WO 92/14871 beschreibt ein Verfahren zur Herstellung einer Faser mit verringerter Fibrillierneigung. Diese wird erzielt, indem alle Bäder, mit denen die Faser vor der ersten Trocknung in Berührung kommt, einen pH-Wert von maximal 8,5 aufweisen.WO 92/14871 describes a method for producing a fiber with a reduced tendency to fibrillation. This is achieved in that all baths with which the fiber comes into contact before the first drying have a pH of maximum 8.5.
Die WO 92/07124 beschreibt ebenfalls ein Verfahren zur Herstellung einer Faser mit verringerter Fibrillierneigung, gemäß dem die nicht getrocknete Faser mit einem kationischen Polymer behandelt wird. Als derartiges Polymer wird ein Polymer mit Imidazol- und Azetidin-Gruppen genannt. Zusätzlich kann noch eine Behandlung mit einem emulgierbaren Polymer, wie z.B. Polyethylen oder Polyvinylacetat, oder auch eine Vernetzung mit Glyoxal erfolgen.WO 92/07124 also describes a method for producing a fiber with a reduced tendency to fibrillation, according to which the undried fiber is treated with a cationic polymer. A polymer with imidazole and azetidine groups is mentioned as such a polymer. In addition, treatment with an emulsifiable polymer, e.g. Polyethylene or polyvinyl acetate, or crosslinking with glyoxal.
In einem bei der CELLUCON-Konferenz 1993 in Lund, Schweden, von S. Mortimer gehaltenen Vortrag wurde erwähnt, daß die Fibrillationsneigung mit zunehmender Verstreckung ansteigt.In a lecture given by S. Mortimer at the 1993 CELLUCON conference in Lund, Sweden, it was mentioned that the tendency to fibrillation increased with increasing stretching.
Es hat sich gezeigt, daß die bekannten Cellulosefasern der Gattung Lyocell hinsichtlich Fibrillationsneigung noch zu wünschen übrig lassen, und die vorliegende Erfindung stellt sich somit die Aufgabe, eine Cellulosefaser der Gattung Lyocell zur Verfügung zu stellen, die eine weiter verringerte Fibrillationsneigung besitzt.It has been shown that the known cellulose fibers of the Lyocell genus still leave something to be desired with regard to the tendency to fibrillation, and the present invention therefore has the object of providing a cellulose fiber of the Genus Lyocell which has a further reduced tendency to fibrillation.
Dieses Ziel wird bei einem Verfahren der eingangs beschriebenen Art dadurch erreicht, daß die extrudierten Filamente bei der Führung durch den Luftspalt mit einem aliphatischen Alkohol in Kontakt gebracht werden, der ausschließlich in gasfömiger Form vorliegt.This aim is achieved in a method of the type described in the introduction in that the extruded filaments are brought into contact with an aliphatic alcohol which is present exclusively in gaseous form during the passage through the air gap.
Mit der Bezeichnung "Luftspalt" ist der Gasraum gemeint, der sich zwischen der Spinndüse und dem Fällbad erstreckt. Das Gas in diesem Gasraum braucht jedoch nicht unbedingt Luft sein, sondern kann vielmehr jedes Gas oder Gasgemisch sein, welches das Spinnverfahren nicht beeinträchtigt. Die Bezeichnung "Luftspalt" umfaßt somit neben Luft jedes derartige Gas oder Gasgemisch.The term "air gap" means the gas space which extends between the spinneret and the precipitation bath. However, the gas in this gas space does not necessarily have to be air, but rather can be any gas or gas mixture which does not impair the spinning process. The term "air gap" thus includes any such gas or gas mixture in addition to air.
Wie oben erwähnt, soll der aliphatische Alkohol in "gasförmiger Form" vorliegen. Mit dieser Bezeichnung soll für die Zwecke der vorliegenden Beschreibung und Patentansprüche ausgedrückt werden, daß der Alkohol im Luftspalt nicht als Nebel vorliegt. Es hat sich herausgestellt, daß es für das erfindungsgemäße Verfahren wesentlich ist, daß im Luftspalt der Taupunkt für den verwendeten Alkohol nicht unterschritten wird. Dadurch kann mit Sicherheit verhindert werden kann, daß der Alkohol in Form von nebelbildenden, kleinen Tröpfchen vorliegt.As mentioned above, the aliphatic alcohol is said to be in "gaseous form". For the purposes of the present description and claims, this term is intended to express that the alcohol in the air gap is not present as a mist. It has been found that it is essential for the process according to the invention that the dew point for the alcohol used is not undercut in the air gap. This can be prevented with certainty that the alcohol is in the form of small, droplet-forming droplets.
Im Gegensatz zum erfindungsgemäßen Verfahren ist aus der US-A - 4,261,943 bekannt, die extrudierten Filamente durch eine Nebelkammer zu führen, in welcher ein Nichtlösungsmittel, z.B. Wasser, in Form kleinster Tröpfchen vorliegt. Mit dieser Maßnahme soll die Klebrigkeit der frisch extrudierten Filamente herabgesetzt werden, da die Wassertröpfchen die Filamente oberflächlich koagulieren. Eine oberflächliche Koagulation wird im erfindungsgemäßen Verfahren weder erzielt noch angestrebt, da dies für die Fasern nachteilig ist. Die vorliegende Erfindung beruht auf der Erkenntnis, daß Cellulosefasern der Gattung Lyocell eine beträchtlich verringerte Fibrillierneigung aufweisen, wenn die frisch extrudierten Filamente einem aliphatischen Alkohol ausgesetzt werden.In contrast to the method according to the invention, it is known from US Pat. No. 4,261,943 to pass the extruded filaments through a cloud chamber in which a non-solvent, for example water, is in the form of tiny droplets is present. This measure is intended to reduce the stickiness of the freshly extruded filaments, since the water droplets coagulate the surface of the filaments. Superficial coagulation is neither achieved nor aimed for in the process according to the invention, since this is disadvantageous for the fibers. The present invention is based on the discovery that cellulose fibers of the Lyocell genus have a considerably reduced tendency to fibrillate when the freshly extruded filaments are exposed to an aliphatic alcohol.
Es hat sich gezeigt, daß sich folgende Alkohole besonders gut eignen, die Fibrillierneigung zu verringern: Methanol, Ethanol, n-Propanol, i-Propanol, n-Butanol, sek.-Butanol und tert.-Butanol. Auch ein Gemisch dieser Alkohole kann eingesetzt werden.It has been shown that the following alcohols are particularly suitable for reducing the tendency to fibrillation: methanol, ethanol, n-propanol, i-propanol, n-butanol, sec-butanol and tert-butanol. A mixture of these alcohols can also be used.
In "Structure formation of cellulosic fibres from aminoxide solvents" (Weigel P.; Gensrich, J.; Fink, H.P.; Challenges in Cellulosic Man-Made Fibres, Viscose Chemistry Seminar, Stockholm 1994) ist erwähnt, daß eine Verwendung von Isopropanol als Fällbad die Herstellung einer Faser mit geringer Fibrillierneigung gestattet. Isopropanol als Fällungsmittel ist nachteilig, weil die textilen Daten stark zurückgehen. Die Untersuchung der Kristallisation der Faser bei der Verwendung von Methanol im Spinnbad wurde von Dube, M.; Blackwell, R.H.: 1983 TAPPI International Dissolving and Specialty Pulps, Proceedings S. 111-119, und von Quenin, I.: "Precipitation de la cellulose a partir de solutions dans les oxydes d'amines tertiaires - application au filage", Dissertation 1985, untersucht. Demgegenüber haben die Erfinder der vorliegenden Erfindung festgestellt, daß selbst bei Verwendung eines wäßrigen Fällbades eine Faser mit der gewünschten verringerten Fibrillierneigung hergestellt werden kann, sofern im Luftspalt ein aliphatischer Alkohol in Gasform vorgesehen wird.In "Structure formation of cellulosic fibers from amine oxide solvents" (Weigel P .; Gensrich, J .; Fink, HP; Challenges in Cellulosic Man-Made Fibers, Viscose Chemistry Seminar, Stockholm 1994) it is mentioned that isopropanol is used as the precipitation bath allows the production of a fiber with a low tendency to fibrillation. Isopropanol as a precipitant is disadvantageous because the textile data are falling sharply. The investigation of the crystallization of the fiber when using methanol in the spin bath was carried out by Dube, M .; Blackwell, RH: 1983 TAPPI International Dissolving and Specialty Pulps, Proceedings pp. 111-119, and von Quenin, I .: "Precipitation de la cellulose a partir de solutions dans les oxydes d'amines tertiaires - application au filage", dissertation 1985 , examined. In contrast, the inventors of the present invention have found that even if an aqueous precipitation bath is used, a fiber with the desired reduced tendency to fibrillation can be produced if an aliphatic alcohol is provided in gaseous form in the air gap.
Für eine effiziente Produktion von Fasern mit verringerter Fibrillationstendenz hat es sich als vorteilhaft herausgestellt, wenn die extrudierten Filamente im Luftspalt mit einem Gasstrom beblasen werden, welcher den aliphatischen Alkohol in gasförmiger Form enthält. Die Herstellung eines alkoholhältigen Gasstroms ist dem Fachmann bekannt und kann z.B. einfach dadurch erfolgen, daß der Alkohol etwa mittels eines Ultraschallzerstäubers in den Gasstrom zerstäubt wird oder daß der Gasstrom durch den Alkohol hindurchgeführt wird.For an efficient production of fibers with a reduced tendency to fibrillation, it has proven to be advantageous if the extruded filaments are blown in the air gap with a gas stream which contains the aliphatic alcohol in gaseous form. The production of an alcohol-containing gas stream is known to the person skilled in the art and can e.g. simply by spraying the alcohol into the gas stream using an ultrasonic atomizer or by passing the gas stream through the alcohol.
Eine weitere vorteilhafte Variante des erfindungsgemäßen Verfahrens besteht darin, daß die Lösung von Cellulose in einem wäßrigen tertiären Aminoxid durch ringförmig angeordnete Spinnlöcher einer Spinndüse zu Filamenten extrudiert wird, sodaß ein ringförmig ausgebildeter Filamentvorhang durch den Luftspalt geführt wird, und daß der Gasstrom im Zentrum des vom Filamentvorhang gebildeten Ringes zugeführt und der Filamentvorhang radial von innen nach außen beblasen wird. Eine geeignete Vorrichtung, mit welcher ein ringförmiger Filamentvorhang in der beschriebenen Weise beblasen werden kann, ist aus der WO 93/19230 bekannt.A further advantageous variant of the process according to the invention is that the solution of cellulose in an aqueous tertiary amine oxide is extruded into filaments through ring-shaped spinning holes of a spinneret, so that a ring-shaped filament curtain is passed through the air gap, and that the gas stream is in the center of the Filament curtain formed ring supplied and the filament curtain is blown radially from the inside out. A suitable device with which an annular filament curtain can be blown in the manner described is known from WO 93/19230.
Es hat sich als zweckmäßig erwiesen, die extrudierten Filamente noch zusätzlich von einem zweiten Gasstrom zu beblasen, wobei der ringförmig ausgebildeten Filamentvorhang radial von außen nach innen beblasen wird. Auch ein solches Beblasungsverfahren ist prinzipiell aus der WO 93/19230 bekannt.It has proven expedient to additionally blow the extruded filaments with a second gas stream, the ring-shaped filament curtain being blown radially from the outside inwards. Such a blowing process is also known in principle from WO 93/19230.
Es hat sich gezeigt, daß sich große Luftspaltbreiten positiv auf das Fibrillationsverhalten auswirken, daß dies jedoch bei den bei Stapelfaserdüsen verwendeten kleinen Loch/Loch-Abständen relativ schnell zum Auftreten von Spinnfehlern führt. Bevorzugt ist eine Luftspaltbreite von kleiner als 60 mm und größer als 20 mm.It has been shown that large air gap widths have a positive effect on the fibrillation behavior, but that this occurs relatively quickly with the small hole / hole spacings used in staple fiber nozzles Leads to spinning defects. An air gap width of less than 60 mm and greater than 20 mm is preferred.
Die Spinnlöcher haben vorzugsweise einen Durchmesser zwischen 80 und 100 µm.The spinning holes preferably have a diameter between 80 and 100 microns.
Pro Spinnloch werden am besten zwischen 0,025 und 0,05 g Celluloselösung pro Minute extrudiert.It is best to extrude between 0.025 and 0.05 g of cellulose solution per minute per spinning hole.
Die Temperatur im Luftspalt wird so gewählt, daß einerseits der Taupunkt nicht unterschritten wird, d.h., daß kein Alkohol im Luftspalt kondensiert, und daß andererseits nicht infolge zu hoher Temperatur Spinnschwierigkeiten auftreten. Es können Werte zwischen 10 und 60°C eingestellt werden, wobei Temperaturen zwischen 20 und 40°C bevorzugt sind.The temperature in the air gap is selected so that on the one hand the dew point is not fallen below, i.e. that no alcohol condenses in the air gap and on the other hand that there are no difficulties in spinning due to the temperature being too high. Values between 10 and 60 ° C can be set, with temperatures between 20 and 40 ° C being preferred.
Nach dem erfindungsgemäßen Verfahren können alle bekannten cellulosischen Spinnmassen verarbeitet werden. So können diese Spinnmassen zwischen 5 und 25 % Cellulose enthalten. Bevorzugt sind jedoch Cellulosegehalte zwischen 10 und 18 %. Als Rohstoff zur Zellstofferzeugung kann Hart- oder Weichholz eingesetzt werden, wobei die Polymerisationsgrade des/der Zellstoffe im Bereich der technisch gängigen Handelsprodukte liegen können. Es können auch Mischungen von mehreren Zellstoffen eingesetzt werden (Chanzy et al., TAPPI 5th International Dissolving Pulp Conference 1980, S. 105-108). Es hat sich jedoch gezeigt, daß bei höherem Molekulargewicht des Zellstoffes das Spinnverhalten besser ist. Die Spinntemperatur kann je nach Polymerisationsgrad des Zellstoffes bzw. Lösungskonzentration zwischen 75 und 140°C liegen und kann für jeden Zellstoff bzw. für jede Konzentration auf einfache Weise optimiert werden. Der Verzug im Luftspalt hängt bei festgelegtem Titer der Fasern vom Düsenlochdurchmesser und von der Cellulosekonzentration der Lösung ab. Im Bereich der bevorzugten Cellulosekonzentration konnte jedoch kein Einfluß dieser auf das Fibrillationsveralten festgestellt werden, solange man sich im Gebiet der optimalen Spinntemperatur befindet.All known cellulosic spinning materials can be processed by the process according to the invention. So these spinning masses can contain between 5 and 25% cellulose. However, cellulose contents between 10 and 18% are preferred. Hard or softwood can be used as the raw material for pulp production, and the degrees of polymerization of the pulp (s) can be in the range of commercially available products. Mixtures of several pulps can also be used (Chanzy et al., TAPPI 5th International Dissolving Pulp Conference 1980, pp. 105-108). However, it has been shown that the spinning behavior is better with a higher molecular weight of the pulp. Depending on the degree of polymerization of the pulp or solution concentration, the spinning temperature can be between 75 and 140 ° C. and can be easily optimized for each pulp or concentration. The warping in the air gap depends on the diameter of the nozzle hole and the concentration of cellulose in the solution when the titer of the fibers is fixed. In the range of the preferred cellulose concentration, however, this could not be influenced the fibrillation obsolescence is determined as long as one is in the area of the optimal spinning temperature.
Nachfolgend werden die Prüfverfahren und bevorzugte Ausführungsformen der Erfindung näher beschrieben.The test methods and preferred embodiments of the invention are described in more detail below.
Die Reibung der Fasern aneinander bei Waschvorgängen bzw. bei Ausrüstvorgängen im nassen Zustand wurde durch folgenden Test simuliert: 8 Fasern wurden mit 4 ml Wasser in ein 20 ml Probenfläschchen gegeben und während 9 Stunden in einem Laborschüttelgerät der Type RO-10 der Fa. Gerhardt, Bonn (BRD) auf Stufe 12 geschüttelt. Das Fibrillierverhalten der Fasern wurde danach unter dem Mikroskop mittels Auszählen der Anzahl der Fibrillen pro 0,276 mm Faserlänge beurteilt.The friction of the fibers against one another during washing processes or during finishing processes when wet was simulated by the following test: 8 fibers were placed in a 20 ml sample vial with 4 ml of water and in a laboratory shaker type RO-10 from Gerhardt for 9 hours, Bonn (FRG) shaken at level 12. The fibrillation behavior of the fibers was then assessed under the microscope by counting the number of fibrils per 0.276 mm fiber length.
Festigkeit und Dehnung konditioniert wurden nach der BISFA-Vorschrift "Internationally agreed methods for testing viscose, modal, cupro, lyocell, acetat and triacetate staple fibres and tows", Ausgabe 1993, geprüft.Strength and elongation were tested according to the BISFA regulation "Internationally agreed methods for testing viscose, modal, cupro, lyocell, acetate and triacetate staple fibers and tows", edition 1993.
Es wurde eine 12%ige Spinnlösung aus Sulfit- und Sulfat-Zellstoff (12% Wasser, 76% NNMO) mit einer Temperatur von 115°C versponnen. Als Spinnapparat wurde ein in der Kunststoffverarbeitung gebräuchliches Schmelzindexgerät der Firma Davenport verwendet. Dieses Gerät besteht aus einem beheizten temperaturregelbaren Zylinder, in den die Spinnmasse eingefüllt wird. Mittels eines Kolbens, der mit einem Gewicht belastet wird, wird die Spinnmasse durch die an der Unterseite des Zylinders angebrachte Spinndüse extrudiert. Dieses Verfahren wird als Trocken/Naß-Spinnverfahren bezeichnet, da das extrudierte Filament nach Durchlaufen eines Luftspaltes in ein Spinnbad eintaucht.A 12% spinning solution of sulfite and sulfate pulp (12% water, 76% NNMO) was spun at a temperature of 115 ° C. A melt index device from Davenport used in plastics processing was used as the spinning apparatus. This device consists of a heated, temperature-controlled cylinder into which the spinning mass is poured. By means of a piston, which is loaded with a weight, the spinning mass is passed through the spinneret attached to the underside of the cylinder extruded. This process is referred to as the dry / wet spinning process since the extruded filament is immersed in a spinning bath after it has passed through an air gap.
Es wurden insgesamt 9 Extrusionsversuche durchgeführt, wobei der verwendete Alkohol, seine Konzentration, der Spinnmassedurchsatz und die Breite des Luftspaltes variiert wurden. Als Vergleich diente ein Verspinnen über einen Luftspalt ohne Alkohol (80% rel. Feuchtigkeit; 28°C). In der Spalte "Fibrillen" ist die durchschnittliche Anzahl der Fibrillen auf einer Faserlänge von 276 µm angegeben. Die Ergebnisse sind in der Tabelle 1 angegeben.
In der Tabelle sind der verwendete Alkohol, die Alkoholkonzentration im Luftspalt (g/m3), der Spinnmassedurchsatz (g Spinnmasse/Loch/min), die Länge des Luftspaltes (mm) und die Anzahl der Fibrillen pro Faserlänge von 0,276 µm, die im oben beschriebenen Fibrillationstest erhalten wurden, angegeben.In the table are the alcohol used, the alcohol concentration in the air gap (g / m 3 ), the Spinning mass throughput (g of spinning mass / hole / min), the length of the air gap (mm) and the number of fibrils per fiber length of 0.276 μm, which were obtained in the fibrillation test described above.
Für die Beispiele 9 bis 14 wurde eine Spinndüse mit kreisförmig angeordneten Spinnlöchern verwendet, sodaß ein kreisförmig ausgebildeter Filamentvorhang durch den Luftspalt geführt wurde. In das Zentrum des von den Spinnlöchern gebildeten Kreises wurde für Beispiel 9 Luft (Vergleich) und für die Beispiele 10-14 methanolhaltiges Gas eingespeist und radial nach außen geblasen. Ein Spinnvorrichtung, mit welcher die Beispiele 9 bis 14 durchgeführt werden können, ist aus der WO 93/19230 (Fig. 2) bekannt, wobei der ringförmig ausgebildete Filamentvorhang jedoch nur radial von innen nach außen beblasen wurde. Im übrigen wurde analog den Bedingungen der Beispiele 1-8 gearbeitet.A spinneret with circularly arranged spinning holes was used for Examples 9 to 14, so that a circular filament curtain was passed through the air gap. For example 9, air (comparison) and for examples 10-14 gas containing methanol were fed into the center of the circle formed by the spinning holes and blown radially outward. A spinning device with which Examples 9 to 14 can be carried out is known from WO 93/19230 (FIG. 2), but the ring-shaped filament curtain was only blown radially from the inside to the outside. The rest of the procedure was analogous to the conditions of Examples 1-8.
Die Ergebnisse sind in der Tabelle 2 angegegeben.
In der Tabelle 3 sind für die in der Tabelle 2 angebenen Fasern charakteristische Faserdaten zusammengestellt.
Die Titer (dtex) der in der Tabelle 3 angeführten Fasern 9, 10, 11, 12, 13 und 14 waren 1,71, 1,56, 1,6, 1,62, 2,1 bzw. 1,86.The titers (dtex) of fibers 9, 10, 11, 12, 13 and 14 shown in Table 3 were 1.71, 1.56, 1.6, 1.62, 2.1 and 1.86, respectively.
Claims (8)
- A process for the production of cellulose fibres, wherein a solution of cellulose in an aqueous tertiary amine-oxide is extruded through spinning holes of a spinneret into filaments and conducted across an air gap into a substantially aqueous precipitation bath, characterized in that said extruded filaments, while being conducted across the air gap, are contacted with an aliphatic alcohol, said alcohol being present exclusively in gaseous state.
- A process according to Claim 1, characterized in that as said alcohol methanol, ethanol, n-propanol, i-propanol, n-butanol, sec.-butanol or tert.-butanol or a mixture of these alcohols is used.
- A process according to one of the Claims 1 to 3, characterized in that said extruded filaments are contacted with said aliphatic alcohol by being exposed in the air gap to a gas stream containing said aliphatic alcohol in gaseous state.
- A process according to Claim 3, characterized in that said solution of cellulose in an aqueous tertiary amine-oxide is extruded through spinning holes of a spinneret arranged in a ring-shape into filaments, a filament curtain arranged in a ring-shape being conducted across the air gap, and that said gas stream is introduced in the center of the ring formed by the filament curtain, said filament curtain being exposed radially to said gas stream from the inside towards the outside.
- A process according to Claim 4, characterized in that said extruded filaments additionally are exposed to a second gas stream, said filament curtain arranged in a ring-shape being exposed to said gas stream radially from the outside towards the inside.
- A process according to one of the Claims 1 to 5, characterized in that said air gap has a length of from 20 to 60 mm.
- A process according to Claim 1, characterized in that said spinning holes have a diameter of from 80 to 100 µm.
- A process according to Claim 7, characterized in that from 0,025 to 0,05 g of cellulose solution per minute are extruded at each spinning hole.
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SI9530003T SI0731856T1 (en) | 1994-09-05 | 1995-06-26 | Process for the preparation of cellulose fibres |
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AT0169994A AT401393B (en) | 1994-09-05 | 1994-09-05 | METHOD FOR PRODUCING CELLULOSE FIBERS |
AT1699/94 | 1994-09-05 | ||
PCT/AT1995/000131 WO1996007777A1 (en) | 1994-09-05 | 1995-06-26 | Process for producing cellulose fibres |
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EP0731856B1 true EP0731856B1 (en) | 1996-09-25 |
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US (1) | US5601771A (en) |
EP (1) | EP0731856B1 (en) |
JP (1) | JPH09505118A (en) |
CN (1) | CN1039044C (en) |
AT (2) | AT401393B (en) |
AU (1) | AU689268B2 (en) |
BR (1) | BR9506354A (en) |
CA (1) | CA2175562A1 (en) |
DE (3) | DE19580977D2 (en) |
ES (1) | ES2092921T3 (en) |
FI (1) | FI961901A (en) |
GB (1) | GB2297055B (en) |
GR (1) | GR3021174T3 (en) |
HK (1) | HK1000326A1 (en) |
MY (1) | MY132079A (en) |
NO (1) | NO961794D0 (en) |
TR (1) | TR199501001A2 (en) |
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DE10043297B4 (en) * | 2000-09-02 | 2005-12-08 | Thüringisches Institut für Textil- und Kunststoff-Forschung e.V. | Process for the production of cellulose fibers and cellulose filament yarns |
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GB9412500D0 (en) * | 1994-06-22 | 1994-08-10 | Courtaulds Fibres Holdings Ltd | Fibre manufacture |
SE505873C2 (en) * | 1996-01-10 | 1997-10-20 | Moelnlycke Ab | Process for the production of absorbent materials, absorbent materials and absorbent articles containing the material in question |
EP0807460A1 (en) * | 1996-05-15 | 1997-11-19 | Akzo Nobel N.V. | Cellulosic dialysis membrane |
US6471727B2 (en) | 1996-08-23 | 2002-10-29 | Weyerhaeuser Company | Lyocell fibers, and compositions for making the same |
US6331354B1 (en) | 1996-08-23 | 2001-12-18 | Weyerhaeuser Company | Alkaline pulp having low average degree of polymerization values and method of producing the same |
US6210801B1 (en) | 1996-08-23 | 2001-04-03 | Weyerhaeuser Company | Lyocell fibers, and compositions for making same |
US6306334B1 (en) | 1996-08-23 | 2001-10-23 | The Weyerhaeuser Company | Process for melt blowing continuous lyocell fibers |
EP0853146A3 (en) * | 1997-01-09 | 1999-03-24 | Akzo Nobel N.V. | Method of producing cellulosic fibres and cellulosic fibres |
CN1061106C (en) * | 1997-12-09 | 2001-01-24 | 宜宾丝丽雅集团有限公司 | Method for producing cellulose fiber by dissolvant method |
GB2337957A (en) * | 1998-06-05 | 1999-12-08 | Courtaulds Fibres | Method of manufacture of a nonwoven fabric |
US6773648B2 (en) | 1998-11-03 | 2004-08-10 | Weyerhaeuser Company | Meltblown process with mechanical attenuation |
DE10206089A1 (en) | 2002-02-13 | 2002-08-14 | Zimmer Ag | bursting |
US6799132B2 (en) * | 2003-01-08 | 2004-09-28 | Westinghouse Air Brake Technologies Corporation | Smart resolution valve pressure control |
KR100575378B1 (en) * | 2004-11-10 | 2006-05-02 | 주식회사 효성 | Process for preparing a cellulose fiber |
EP2589689B1 (en) * | 2010-06-30 | 2018-02-28 | Kolon Industries, Inc. | Dope for spinning lyocell, method for preparing lyocell filament fiber , and method for preparing a lyocell staple fiber using same |
DE202013011959U1 (en) | 2012-08-22 | 2014-12-15 | Deutsche Institute Für Textil- Und Faserforschung Denkendorf | Direct-spun cellulose fibers, their preparation and use |
DE102012016714A1 (en) * | 2012-08-22 | 2014-02-27 | Deutsche Institute Für Textil- Und Faserforschung Denkendorf | Regenerated cellulose fibers which are present as non-fibrillating cellulose filaments present in form of micro- or super-micro-filaments having less titre, useful e.g. as carbon fiber precursors for producing carbon fibers |
TWI667378B (en) | 2014-01-03 | 2019-08-01 | 奧地利商蘭精股份有限公司 | Cellulosic fibre |
US10626232B2 (en) * | 2017-07-25 | 2020-04-21 | Kruger Inc. | Systems and methods to produce treated cellulose filaments and thermoplastic composite materials comprising treated cellulose filaments |
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US4246221A (en) * | 1979-03-02 | 1981-01-20 | Akzona Incorporated | Process for shaped cellulose article prepared from a solution containing cellulose dissolved in a tertiary amine N-oxide solvent |
US4416698A (en) * | 1977-07-26 | 1983-11-22 | Akzona Incorporated | Shaped cellulose article prepared from a solution containing cellulose dissolved in a tertiary amine N-oxide solvent and a process for making the article |
US4261943A (en) * | 1979-07-02 | 1981-04-14 | Akzona Incorporated | Process for surface treating cellulose products |
SU1331914A1 (en) * | 1985-09-23 | 1987-08-23 | Научно-исследовательский институт химии Саратовского государственного университета им.Н.Г.Чернышевского | Method of enhanging fibre quality |
AT392972B (en) * | 1988-08-16 | 1991-07-25 | Chemiefaser Lenzing Ag | METHOD FOR PRODUCING SOLUTIONS OF CELLULOSE AND DEVICE FOR IMPLEMENTING THE METHOD |
GB9022175D0 (en) * | 1990-10-12 | 1990-11-28 | Courtaulds Plc | Treatment of fibres |
GB9103297D0 (en) * | 1991-02-15 | 1991-04-03 | Courtaulds Plc | Fibre production method |
ATA53792A (en) * | 1992-03-17 | 1995-02-15 | Chemiefaser Lenzing Ag | METHOD FOR PRODUCING CELLULOSIC MOLDED BODIES, DEVICE FOR IMPLEMENTING THE METHOD AND USE OF A SPINNING DEVICE |
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DE10043297B4 (en) * | 2000-09-02 | 2005-12-08 | Thüringisches Institut für Textil- und Kunststoff-Forschung e.V. | Process for the production of cellulose fibers and cellulose filament yarns |
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GB9607016D0 (en) | 1996-06-05 |
GR3021174T3 (en) | 1996-12-31 |
BR9506354A (en) | 1997-09-16 |
MY132079A (en) | 2007-09-28 |
AU2706595A (en) | 1996-03-27 |
NO961794L (en) | 1996-05-03 |
GB2297055B (en) | 1997-11-19 |
TW279181B (en) | 1996-06-21 |
DE29514233U1 (en) | 1996-01-11 |
NO961794D0 (en) | 1996-05-03 |
WO1996007777A1 (en) | 1996-03-14 |
CA2175562A1 (en) | 1996-03-14 |
DE59500026D1 (en) | 1996-11-28 |
FI961901A0 (en) | 1996-05-03 |
ATE143423T1 (en) | 1996-10-15 |
AT401393B (en) | 1996-08-26 |
ES2092921T3 (en) | 1996-12-01 |
GB2297055A (en) | 1996-07-24 |
TR199501001A2 (en) | 1996-06-21 |
CN1039044C (en) | 1998-07-08 |
HK1000326A1 (en) | 1998-02-27 |
AU689268B2 (en) | 1998-03-26 |
DE19580977D2 (en) | 1996-09-26 |
ATA169994A (en) | 1996-01-15 |
FI961901A (en) | 1996-05-03 |
JPH09505118A (en) | 1997-05-20 |
US5601771A (en) | 1997-02-11 |
CN1134733A (en) | 1996-10-30 |
EP0731856A1 (en) | 1996-09-18 |
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