EP0218934A2 - Cleaning process for artificial guts of regenerated cellulose - Google Patents
Cleaning process for artificial guts of regenerated cellulose Download PDFInfo
- Publication number
- EP0218934A2 EP0218934A2 EP86112752A EP86112752A EP0218934A2 EP 0218934 A2 EP0218934 A2 EP 0218934A2 EP 86112752 A EP86112752 A EP 86112752A EP 86112752 A EP86112752 A EP 86112752A EP 0218934 A2 EP0218934 A2 EP 0218934A2
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- EP
- European Patent Office
- Prior art keywords
- washing
- regenerated cellulose
- cellulose
- elements
- deflection
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
- D06L1/00—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods
- D06L1/12—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods using aqueous solvents
- D06L1/20—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods using aqueous solvents combined with mechanical means
Definitions
- the invention relates to a method for faster cleaning of products made from regenerated cellulose, in which the product to be cleaned passes through at least one washing segment, where it is first expressed with the aid of squeezing elements and then washed out via deflection elements with the washing medium flowing in countercurrent.
- the coagulation of cellulose xanthate which is caused by the neutralization of the sodium hydroxide solution by sulfuric acid, also follows formation of cellulose by acid hydrolysis (regenerated cellulose).
- acid hydrolysis regenerated cellulose
- noticeable amounts of salts, in particular sodium sulfate which remain together with the regenerating agent sulfuric acid and constituents of the precipitation bath in the cellulose and must be removed by subsequent washing.
- regenerated cellulose products are either in a vertical arrangement (vertical wash), in which the up and down continuous material webs are sprayed with water at the top, with salt and acid-laden water flowing out at the lower deflection points or in horizontal wash baths (tub washing), which often are arranged one above the other in several floors, washed out with water in countercurrent.
- vertical wash in which the up and down continuous material webs are sprayed with water at the top, with salt and acid-laden water flowing out at the lower deflection points or in horizontal wash baths (tub washing), which often are arranged one above the other in several floors, washed out with water in countercurrent.
- the aim of the present invention was therefore to provide a more efficient washing-out process for regenerated cellulose products in order to ultimately increase the production speed.
- the present invention therefore relates to a process for cleaning products made from regenerated cellulose, preferably cellophane films or synthetic casings, which is characterized in that the regenerated cellulose product is passed through at least one washing segment, where it is first squeezed out with the aid of a squeezing element and then with simultaneous deflection is washed out via deflection elements with the washing water conducted in countercurrent.
- washing segments should be run through, wherein the individual washing segments can be combined in a common container or each can be lined up one behind the other or one above the other.
- each of these washing segments (6) should have a Squeeze element (1) must be equipped, the line pressure can be adjusted with the usual methods (hydraulics, spring pressure, etc.).
- the squeezing element should preferably consist of a pair of rollers, at least one of the rollers should have an elastic coating. It is therefore expedient to choose a combination of an upper hard roller and a lower rubber-coated roller, for example a combination of an upper roller made of stainless steel and a lower roller with a hard rubber coating of medium Shore hardness.
- Each washing segment (6) has at least one deflecting element (2), preferably a deflecting roller, the residence time of the product to be washed out being increased with the number of deflecting elements.
- the washing water (7) is conducted in counterflow to the direction of the product (3) to be washed out. In the case of a common container for the individual washing segments, this is ensured by flow guide plates (5).
- the squeezing elements (1) can also be equipped with fresh water nozzles (4) on the inlet side, which flush away the heavily salt-laden water escaping during squeezing, some of which runs off on the product (3).
- line pressures of 1 to 1,000 N per cm should be used during the squeezing process.
- the dwell time between successive squeeze elements should be set so that the absorbent product by absorbing fresh water reaches a high degree of swelling.
- the dwell time can be controlled by the machine speed, but also by the number of deflecting elements, preferably deflecting rollers, and the dimension of the washing segments.
- the suction speed of the material is known to be influenced by the temperature of the wash water.
- line pressures of 100 to 500 N per cm are preferred. Due to the high absorbency of these materials, relatively short residence times of less than 10 seconds can be sufficient to achieve the maximum possible water absorption.
- the cleaning method according to the invention makes it possible to achieve washing-out degrees which are superior to those of the prior art, with a considerable reduction in the size of the system, water and energy. It is also possible to significantly increase the production speed.
- cellulose tubes are cleaned, which are known to be produced by coating a fiber paper formed into a tube with viscose and subsequent coagulation and regeneration in a precipitation bath with a high salt and acid content.
- the washing segments used in the examples each have three deflection rollers, a base area of 50 ⁇ 50 cm and a height of 75 cm, measured between the lower deflection roller and squeeze rollers.
- the synthetic intestine emerging from the pre-cleaning trough made of regenerated cellulose with a load of 0.5 to 0.7 g salt per g cellulose is pressed off with the first squeezing rollers at a line pressure of 120 N / cm and passes through at a speed of 7.5 m / min five washing segments with a total washing distance of 12.5 m.
- the water temperature is 40 ° C, the throughput 25 l / min.
- the artificial intestine has a residual salt content of on average ⁇ 0.001 g of salt per g of cellulose, determined as the residue that can still be removed with water.
- Example 1 an artificial intestine made of regenerated cellulose with a salt load of 0.8 to 1 g salt per g cellulose is cleaned in five washing segments at a speed of 10 m / min.
- the residual salt content after cleaning is 0.002 g salt per g cellulose.
- an artificial intestine made of regenerated cellulose is cleaned, the water throughput being increased to 60 l / min.
- the residual salt content averages 0.0015 g salt per g cellulose.
- Example 3 an intestine with a salt load of 1.2 to 1.4 g of salt per g of cellulose is cleaned at a speed of 15 m / min in seven washing segments corresponding to a total washing distance of 17.5 m.
- the average residual salt content is 0.0025 g of salt per g of artificial casing.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Paper (AREA)
- Artificial Filaments (AREA)
Abstract
Verfahren zur Reinigung von Produkten aus regenerierter Cellulose, indem man das regenerierte Celluloseprodukt durch mindestens ein Waschsegment führt, wo es zunächst mit Hilfe eines Abquetschelementes ausgequetscht und dann bei gleichzeitiger Umlenkung über Umlenkelemente mit dem im Gegenstrom geführten Waschwasser ausgewaschen wird. Process for cleaning products from regenerated cellulose by passing the regenerated cellulose product through at least one washing segment, where it is first squeezed out using a squeezing element and then washed out with the washing water conducted in countercurrent via deflecting elements.
Description
Gegenstand der Erfindung ist ein Verfahren zur rascheren Reinigung von Produkten aus regenerierter Cellulose, in dem das zu reinigende Produkt mindestens ein Waschsegment durchläuft, wo es zunächst mit Hilfe von Abquetschelementen ausgedrückt und anschließend über Umlenkelemente mit dem im Gegenstrom fließenden Waschmedium ausgewaschen wird.The invention relates to a method for faster cleaning of products made from regenerated cellulose, in which the product to be cleaned passes through at least one washing segment, where it is first expressed with the aid of squeezing elements and then washed out via deflection elements with the washing medium flowing in countercurrent.
Es ist bekannt, daß bei den üblichen Trockenspinnverfahren die Festkörperbildung durch Verdampfen des Lösungsmittels beispielsweise in einem Trockenschacht erfolgt, während beim Naßspinnverfahren das Lösungsmittel durch Verdünnung, Ausspülung, Neutralisation usw. entzogen und das gelöste Polymere so zur Ausfällung gebracht und anschließend durch Auswaschen gereinigt wird.It is known that in the conventional dry spinning process the solid is formed by evaporation of the solvent, for example in a drying shaft, while in the wet spinning process the solvent is removed by dilution, rinsing, neutralization etc. and the dissolved polymer is thus precipitated and subsequently cleaned by washing.
So schließt sich auch an die Koagulation von Cellulose-Xanthogenat, die durch Neutralisation der Lösungsnatronlauge durch Schwefelsäure hervorgerufen wird, die Rückbil dung der Cellulose durch saure Hydrolyse an (Regeneratcellulose). Dabei entstehen neben gasförmigen Verbindungen wie Schwefelwasserstoff und Schwefelkohlenstoff auch merkliche Mengen an Salzen, insbesondere Natriumsulfat, die zusammen mit dem Regenerationsmittel Schwefelsäure und Bestandteilen des Fällbades in der Cellulose verbleiben und durch anschließende Wäsche entfernt werden müssen.The coagulation of cellulose xanthate, which is caused by the neutralization of the sodium hydroxide solution by sulfuric acid, also follows formation of cellulose by acid hydrolysis (regenerated cellulose). In addition to gaseous compounds such as hydrogen sulfide and carbon disulphide, noticeable amounts of salts, in particular sodium sulfate, which remain together with the regenerating agent sulfuric acid and constituents of the precipitation bath in the cellulose and must be removed by subsequent washing.
Das vollständige Auswaschen aller Begleitsubstanzen ist besonders wichtig bei Celluloseprodukten, die als Bedarfsgegenstände mit Lebensmitteln in Berührung kommen, wie beispielsweise als Verpackungsfolie oder Kunstdärme.The complete washing out of all accompanying substances is particularly important for cellulose products that come into contact with food as commodities, such as packaging foil or artificial casings.
Üblicherweise werden regenerierte Celluloseprodukte entweder in einer senkrechten Anordnung (Senkrechtwäsche), bei der die auf- und ablaufenden Endlosmaterialbahnen oben mit Wasser besprüht werden, wobei an den unteren Umlenkpunkten Salz- und Säure-beladenes Wasser abfließt oder in waagerechten Waschbädern (Wannenwäsche), die oft in mehreren Etagen übereinander angeordnet sind, mit Wasser im Gegenstrom ausgewaschen.Usually, regenerated cellulose products are either in a vertical arrangement (vertical wash), in which the up and down continuous material webs are sprayed with water at the top, with salt and acid-laden water flowing out at the lower deflection points or in horizontal wash baths (tub washing), which often are arranged one above the other in several floors, washed out with water in countercurrent.
Beide Systeme weisen erhebliche Nachteile auf. Sowohl bei der Senkrecht- als auch bei der Wannenwäsche laufen rein diffusionsgesteuerte Vorgänge ab. Das hat zur Folge, daß zunächst bei hohen Konzentrationen an auszuwaschenden Bestandteilen der Stoffaustausch schnell vonstatten geht und daher nur kurze Waschstrecken notwendig sind, während mit abnehmenden Konzentrationen wegen des geringen Stoff austausches die Waschstrecken erheblich länger ausgelegt werden müssen. Rückstände von weniger als 1 g Salz pro 100 g Cellulose sind nur mit großem Aufwand zu erreichen.Both systems have significant disadvantages. Purely diffusion-controlled processes take place in both vertical and bathtub washing. The consequence of this is that, at first, with high concentrations of components to be washed out, the mass transfer takes place quickly and therefore only short washing distances are necessary, while with decreasing concentrations because of the low amount of material exchanges the washing sections must be designed considerably longer Residues of less than 1 g salt per 100 g cellulose can only be achieved with great effort.
Um die geforderten hohen Auswaschgrade zu erreichen, sind daher sowohl bei der Senkrecht- als auch bei der Wannenwäsche erhebliche Mengen an Energie, Wasser und umbautem Raum notwendig.In order to achieve the required high degrees of washout, considerable amounts of energy, water and enclosed space are necessary for both vertical and bathtub washing.
Ziel der vorliegenden Erfindung war es daher, ein effizienteres Auswaschverfahren für regenerierte Celluloseprodukte zur Verfügung zu stellen, um schließlich damit eine Erhöhung der Produktionsgeschwindigkeit zu erzielen.The aim of the present invention was therefore to provide a more efficient washing-out process for regenerated cellulose products in order to ultimately increase the production speed.
Gegenstand der vorliegenden Erfindung ist daher ein Verfahren zur Reinigung von Produkten aus regenerierter Cellulose, vorzugsweise Zellglasfolien oder Kunstdärme, das dadurch gekennzeichnet ist, daß man das regenerierte Celluloseprodukt durch mindestens ein Waschsegment führt, wo es zunächst mit Hilfe eines Abquetschelementes ausgequetscht und dann bei gleichzeitiger Umlenkung über Umlenkelemente mit dem im Gegenstrom geführten Waschwasser ausgewaschen wird.The present invention therefore relates to a process for cleaning products made from regenerated cellulose, preferably cellophane films or synthetic casings, which is characterized in that the regenerated cellulose product is passed through at least one washing segment, where it is first squeezed out with the aid of a squeezing element and then with simultaneous deflection is washed out via deflection elements with the washing water conducted in countercurrent.
Je nach dem gewünschten Reinigungsgrad der Celluloseprodukte sollten ein oder mehrere Waschsegmente durchlaufen werden, wobei die einzelnen Waschsegmente in einem gemeinsamen Behälter zusammengefaßt oder jedes für sich hinter oder übereinander aufgereiht sein können. Wie Fig. 1 zeigt, sollte jedes dieser Waschsegmente (6) mit einem Abquetschelement (1) ausgerüstet sein, dessen Liniendruck mit den üblichen Methoden (Hydraulik, Federdruck usw.) einstellbar ist. Vorzugsweise sollte das Abquetschelement aus einem Walzenpaar bestehen, wobei zumindest eine der Walzen einen elastischen Überzug aufweisen soll. Zweckmäßigerweise wählt man daher eine Kombination aus einer oberen harte Walze und einer unteren gummibelegten Walze wie z.B. eine Kombination aus einer oberen Walze aus Edelstahl und einer unteren Walzen mit einem Hartgummiüberzug mittlerer Shore-Härte. In jedem Waschsegment (6) ist mindestens ein Umlenkelement (2), vorzugsweise eine Umlenkrolle vorhanden, wobei mit der Zahl der Umlenkelemente die Verweilzeit des auszuwaschenden Produktes verlängert werden kann. Das Waschwasser (7) wird in Gegenströmung zur Laufrichtung des auszuwaschenden Produkts (3) geführt. Im Falle eines gemeinsamen Behälters für die einzelnen Waschsegmente wird dies durch Strömungsleitbleche (5) sichergestellt.Depending on the desired degree of purification of the cellulose products, one or more washing segments should be run through, wherein the individual washing segments can be combined in a common container or each can be lined up one behind the other or one above the other. As shown in Fig. 1, each of these washing segments (6) should have a Squeeze element (1) must be equipped, the line pressure can be adjusted with the usual methods (hydraulics, spring pressure, etc.). The squeezing element should preferably consist of a pair of rollers, at least one of the rollers should have an elastic coating. It is therefore expedient to choose a combination of an upper hard roller and a lower rubber-coated roller, for example a combination of an upper roller made of stainless steel and a lower roller with a hard rubber coating of medium Shore hardness. Each washing segment (6) has at least one deflecting element (2), preferably a deflecting roller, the residence time of the product to be washed out being increased with the number of deflecting elements. The washing water (7) is conducted in counterflow to the direction of the product (3) to be washed out. In the case of a common container for the individual washing segments, this is ensured by flow guide plates (5).
Die Abquetschelemente (1) können an der Eintrittseite zusätzlich mit Frischwasserdüsen (4) bestückt werden, die das bei der Abquetschung austretende stark salzbeladene Wasser, das zum Teil an dem Produkt (3) abläuft, wegspülen.The squeezing elements (1) can also be equipped with fresh water nozzles (4) on the inlet side, which flush away the heavily salt-laden water escaping during squeezing, some of which runs off on the product (3).
Beim Abquetschvorgang sollten je nach der Dicke des zu reinigenden Produktes Liniendrucke von 1 bis 1.000 N pro cm angewendet werden. Die Verweilzeit zwischen aufeinanderfolgenden Abquetschelementen sollte so eingestellt werden, daß das saugfähige Produkt durch Aufnahme von frischem Wasser einen hohen Quellungszustand erreicht. Bekannterweise kann die Verweilzeit durch die Maschinengeschwindigkeit, aber auch durch die Zahl der Umlenkelemente, vorzugsweise Umlenkrollen, und der Dimension der Waschsegmente gesteuert werden. Die Sauggeschwindigkeit des Materials wird bekannterweise durch die Temperatur des Waschwassers beeinflußt. Bei Cellulose-Regeneratprodukten, vorzugsweise bahnförmigen Materialien oder flachgelegten schlauchförmigen Hüllen wie künstlichen Wursthüllen, sind Liniendrucke von 100 bis 500 N pro cm bevorzugt. Aufgrund der hohen Saugfähigkeit dieser Materialien können relativ kurze Verweilzeiten von unter 10 Sekunden zur Erreichung der maximalen möglichen Wasseraufnahme ausreichen.Depending on the thickness of the product to be cleaned, line pressures of 1 to 1,000 N per cm should be used during the squeezing process. The dwell time between successive squeeze elements should be set so that the absorbent product by absorbing fresh water reaches a high degree of swelling. As is known, the dwell time can be controlled by the machine speed, but also by the number of deflecting elements, preferably deflecting rollers, and the dimension of the washing segments. The suction speed of the material is known to be influenced by the temperature of the wash water. In the case of regenerated cellulose products, preferably sheet-like materials or flat tubular casings such as artificial sausage casings, line pressures of 100 to 500 N per cm are preferred. Due to the high absorbency of these materials, relatively short residence times of less than 10 seconds can be sufficient to achieve the maximum possible water absorption.
Das erfindungsgemäße Reinigungsverfahren gestattet, unter erheblicher Reduzierung von Anlagengröße, Wasser und Energiebedarf Auswaschgrade zu erreichen, die denen des Standes der Technik überlegen sind. Darüber hinaus ist es möglich, dadurch die Produktionsgeschwindigkeit deutlich zu erhöhen.The cleaning method according to the invention makes it possible to achieve washing-out degrees which are superior to those of the prior art, with a considerable reduction in the size of the system, water and energy. It is also possible to significantly increase the production speed.
In den folgenden Beispielen werden Cellulose-Schläuche gereinigt, die bekannterweise durch Beschichten eines zu einem Schlauch geformten Faserpapiers mit Viskose und nachfolgender Koagulation und Regeneration in einem stark salz- und säurehaltigen Fällbad hergestellt wurden. Die in den Beispielen eingesetzten Waschsegmente weisen jeweils drei Umlenkrollen, eine Grundfläche von 50 x 50 cm und eine Höhe von 75 cm, gemessen zwischen unterer Umlenkrolle und Abquetschwalzen, auf.In the following examples, cellulose tubes are cleaned, which are known to be produced by coating a fiber paper formed into a tube with viscose and subsequent coagulation and regeneration in a precipitation bath with a high salt and acid content. The washing segments used in the examples each have three deflection rollers, a base area of 50 × 50 cm and a height of 75 cm, measured between the lower deflection roller and squeeze rollers.
Der aus der Vorreinigungswanne austretende Kunstdarm aus regenerierter Cellulose mit einer Beladung von 0,5 bis 0,7 g Salz pro g Cellulose wird mit den ersten Abquetschrollen bei einem Liniendruck von 120 N/cm abgepreßt und durchläuft mit einer Geschwindigkeit von 7,5 m/min fünf Waschsegmente mit einer Gesamtwaschstrecke von 12,5 m. Die Wassertemperatur beträgt 40° C, der Durchsatz 25 l/min. Am Ende der Waschstrecke weist der Kunstdarm einen Restsalzgehalt von durchschnittlich <0,001 g Salz pro g Cellulose auf, bestimmt als noch mit Wasser herauslösbarer Rest.The synthetic intestine emerging from the pre-cleaning trough made of regenerated cellulose with a load of 0.5 to 0.7 g salt per g cellulose is pressed off with the first squeezing rollers at a line pressure of 120 N / cm and passes through at a speed of 7.5 m / min five washing segments with a total washing distance of 12.5 m. The water temperature is 40 ° C, the throughput 25 l / min. At the end of the washing section, the artificial intestine has a residual salt content of on average <0.001 g of salt per g of cellulose, determined as the residue that can still be removed with water.
Entsprechend Beispiel 1 wird ein Kunstdarm aus regenerierter Cellulose mit einer Salzbeladung von 0,8 bis 1 g Salz pro g Cellulose in fünf Waschsegmenten mit einer Geschwindigkeit von 10 m/min gereinigt. Der Restsalzgehalt nach der Reinigung beträgt 0,002 g Salz pro g Cellulose.According to Example 1, an artificial intestine made of regenerated cellulose with a salt load of 0.8 to 1 g salt per g cellulose is cleaned in five washing segments at a speed of 10 m / min. The residual salt content after cleaning is 0.002 g salt per g cellulose.
Entsprechend Beispiel 1 und 2 wird ein Kunstdarm aus regenerierter Cellulose gereinigt, wobei der Wasserdurchsatz auf 60 l/min erhöht wird. Der Restsalzgehalt beträgt durchschnittlich 0,0015 g Salz pro g Cellulose.According to Examples 1 and 2, an artificial intestine made of regenerated cellulose is cleaned, the water throughput being increased to 60 l / min. The residual salt content averages 0.0015 g salt per g cellulose.
Entsprechend Beispiel 3 wird ein Darm mit einer Salzbeladung von 1,2 bis 1,4 g Salz pro g Cellulose mit einer Geschwindigkeit von 15 m/min in sieben Waschsegmenten entsprechend einer Gesamtwaschstrecke von 17,5 m gereinigt. Der Restsalzgehalt beträgt durchschnittlich 0,0025 g Salz pro g Kunstdarm.
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3536537 | 1985-10-12 | ||
| DE19853536537 DE3536537A1 (en) | 1985-10-12 | 1985-10-12 | METHOD FOR CLEANING PRODUCTS FROM REGENERATED CELLULOSE |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0218934A2 true EP0218934A2 (en) | 1987-04-22 |
| EP0218934A3 EP0218934A3 (en) | 1988-09-14 |
| EP0218934B1 EP0218934B1 (en) | 1990-03-21 |
Family
ID=6283497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP86112752A Expired - Lifetime EP0218934B1 (en) | 1985-10-12 | 1986-09-16 | Cleaning process for artificial guts of regenerated cellulose |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4790044A (en) |
| EP (1) | EP0218934B1 (en) |
| DE (2) | DE3536537A1 (en) |
| FI (1) | FI864079A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000018991A1 (en) * | 1998-09-29 | 2000-04-06 | Lenzing Aktiengesellschaft | Method for producing cellulosic fibers |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5741529A (en) * | 1996-07-31 | 1998-04-21 | Alfacel S.A. | Adjustable reaction tubs for cellulose |
| US5736087A (en) * | 1996-10-30 | 1998-04-07 | Alfacel S.A. | Method for finishing of sausage casings |
| CN114539800B (en) * | 2022-04-01 | 2023-08-04 | 浙江理工大学 | Preparation method and application of high-toughness high-transparency heat-sealable cellulose film |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3972209A (en) * | 1974-11-18 | 1976-08-03 | Serkov Arkadij T | Apparatus for washing yarn during movement thereof |
| FR2317410A1 (en) * | 1975-07-11 | 1977-02-04 | Evsei Moiseevich Mogilevsky | Continuous viscose filament washing unit - has pre washing bath before filaments pass through spray which also tops up bath |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2916767A (en) * | 1956-12-07 | 1959-12-15 | Du Pont | Film casting apparatus including means to restrain transverse shrinkage of the film |
| US3857261A (en) * | 1973-08-27 | 1974-12-31 | Riggs & Lombard Inc | Textile scouring range |
| DE2425374A1 (en) * | 1974-05-25 | 1975-12-04 | Artos Meier Windhorst Kg | METHOD AND DEVICE FOR WET TREATMENT, IN PARTICULAR FOR WASHING MOVING ROLLS OF PRODUCTS |
| US4025304A (en) * | 1974-09-14 | 1977-05-24 | Vepa Ag | Process for the wet treatment of tension-free guided material |
| US3889390A (en) * | 1974-10-18 | 1975-06-17 | Du Pont | Regenerated cellulose softener recovery method and apparatus |
| JPS5274094A (en) * | 1975-12-15 | 1977-06-21 | Toyo Boseki | Correct apparatus for loop size of fibre in continuous treat machine |
| US4372135A (en) * | 1979-05-11 | 1983-02-08 | Greenville Steel Textile Machinery Corporation | Horizontal washer apparatus |
| US4520520A (en) * | 1983-02-01 | 1985-06-04 | Johnston Lawton L | Mercerization process and apparatus |
-
1985
- 1985-10-12 DE DE19853536537 patent/DE3536537A1/en not_active Withdrawn
-
1986
- 1986-09-16 EP EP86112752A patent/EP0218934B1/en not_active Expired - Lifetime
- 1986-09-16 DE DE8686112752T patent/DE3669741D1/en not_active Expired - Lifetime
- 1986-10-09 FI FI864079A patent/FI864079A/en not_active Application Discontinuation
- 1986-10-09 US US06/916,776 patent/US4790044A/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3972209A (en) * | 1974-11-18 | 1976-08-03 | Serkov Arkadij T | Apparatus for washing yarn during movement thereof |
| FR2317410A1 (en) * | 1975-07-11 | 1977-02-04 | Evsei Moiseevich Mogilevsky | Continuous viscose filament washing unit - has pre washing bath before filaments pass through spray which also tops up bath |
Non-Patent Citations (1)
| Title |
|---|
| Kurt Götze :"Chemiefasern nach dem Viskoseverfahren",2.Band,3.Aufl.,Springer Verlag (1967),S.881 bis 885 und 910 bis 913 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000018991A1 (en) * | 1998-09-29 | 2000-04-06 | Lenzing Aktiengesellschaft | Method for producing cellulosic fibers |
| US6645409B2 (en) | 1998-09-29 | 2003-11-11 | Lenzing Aktiengesellschaft | Process for the production of cellulosic fibres |
Also Published As
| Publication number | Publication date |
|---|---|
| FI864079A (en) | 1987-04-13 |
| DE3536537A1 (en) | 1987-04-16 |
| EP0218934B1 (en) | 1990-03-21 |
| EP0218934A3 (en) | 1988-09-14 |
| DE3669741D1 (en) | 1990-04-26 |
| US4790044A (en) | 1988-12-13 |
| FI864079A0 (en) | 1986-10-09 |
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