EP0615016B1 - Method for continuously bleaching a textile web by use of an alkaline solution of hydrogen peroxide - Google Patents

Method for continuously bleaching a textile web by use of an alkaline solution of hydrogen peroxide Download PDF

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Publication number
EP0615016B1
EP0615016B1 EP19940810094 EP94810094A EP0615016B1 EP 0615016 B1 EP0615016 B1 EP 0615016B1 EP 19940810094 EP19940810094 EP 19940810094 EP 94810094 A EP94810094 A EP 94810094A EP 0615016 B1 EP0615016 B1 EP 0615016B1
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EP
European Patent Office
Prior art keywords
shaft
bath
peroxide
fabric web
concentration
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EP19940810094
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German (de)
French (fr)
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EP0615016A1 (en
Inventor
Hans Weber
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Benninger AG Maschinenfabrik
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Benninger AG Maschinenfabrik
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
    • D06B23/00—Component parts, details, or accessories of apparatus or machines, specially adapted for the treating of textile materials, not restricted to a particular kind of apparatus, provided for in groups D06B1/00 - D06B21/00
    • D06B23/20—Arrangements of apparatus for treating processing-liquids, -gases or -vapours, e.g. purification, filtration or distillation
    • D06B23/205—Arrangements of apparatus for treating processing-liquids, -gases or -vapours, e.g. purification, filtration or distillation for adding or mixing constituents of the treating material
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
    • D06B3/00—Passing of textile materials through liquids, gases or vapours to effect treatment, e.g. washing, dyeing, bleaching, sizing, impregnating
    • D06B3/10—Passing of textile materials through liquids, gases or vapours to effect treatment, e.g. washing, dyeing, bleaching, sizing, impregnating of fabrics
    • D06B3/20—Passing of textile materials through liquids, gases or vapours to effect treatment, e.g. washing, dyeing, bleaching, sizing, impregnating of fabrics with means to improve the circulation of the treating material on the surface of the fabric
    • D06B3/201—Passing of textile materials through liquids, gases or vapours to effect treatment, e.g. washing, dyeing, bleaching, sizing, impregnating of fabrics with means to improve the circulation of the treating material on the surface of the fabric the treating material being forced through the textile material

Definitions

  • the invention relates to a method for the continuous bleaching of a textile fabric web by means of a particularly alkaline peroxide liquor.
  • Oxidation bleaching processes using peroxide have long been known and widely used.
  • Alkaline baths with a pH value of more than 10 are mainly used.
  • An example of a bleaching process with an acidic peroxide liquor is described in US-A-4,060,385.
  • Peroxide bleaching requires relatively high temperatures for the bleaching agent to react. These high reaction temperatures are applied in a damper. Before this, the fabric web must be impregnated with the peroxide liquor in a bath. However, peroxide liquors have the property that they generally do not remain chemically stable over a long period of time at higher temperatures. In the previously known impregnation processes, baths with approx. 500 to 1000 liters of peroxide liquor content were used. The liquor temperature had to be kept very low at approx. 20 to 40 ° C in order to avoid chemical breakdown of the liquor. Obviously, with such a large bathroom volume, the bathroom renovation is relatively small.
  • a disadvantage of the low bath temperature is the relatively poor liquor exchange, which requires a longer residence time in the liquor, and the inefficient heat balance, since heating up is then required again in the steamer.
  • bleach baths with a large liquor content are relatively inefficient in terms of handling and space consumption.
  • the fleet exchange i.e. the ratio of the concentration on the goods to the concentration in the fleet, is to be optimized. According to the invention, this object is achieved by a method which has the features in claim 1.
  • the narrow shaft side walls of the U-shaped shaft obviously form a liquor bath with very little content.
  • new peroxide liquor must be added continuously, which is preferably done below the liquor level. This prevents foaming.
  • the ratio of the fleet consumption to the fleet volume results in a complete bath renewal within a relatively short time, so that the bath can be kept at temperatures of above 50 ° C., preferably even above 60 ° C. An optimal degree of impregnation is achieved at these high temperatures, which considerably simplifies concentration regulation.
  • the fabric web arrives at a high temperature in the subsequent damper so that there is no undesired cooling in the feed area.
  • the very small bath volume also enables the peroxide liquor to be changed within a very short time, since only small amounts of liquid need to be exchanged.
  • the flow speed in the legs of the shaft relative to the fabric web can be set to a certain value in order to achieve a further treatment effect.
  • This flow rate can even be changed with a circulating pump with adjustable delivery capacity.
  • the liquor level can be measured continuously and new peroxide liquor can be added when the liquor level drops will.
  • This supply takes place particularly advantageously in the connection area between the two legs of the shaft.
  • a turbulent flow forms there, with the fabric web being loaded intensively and with depth of peroxide with the entire depth.
  • the peroxide liquor can be discharged at one end in the legs of the shaft either in countercurrent or in the direction of flow in cocurrent to the fabric web and fed in again at the other end.
  • the counter-current operation causes a very intensive fleet exchange and a turbulent flow even in the legs of the shaft.
  • DC operation supports tissue transport and thus a particularly gentle treatment in the treatment zone.
  • the concentration of the peroxide liquor can be measured permanently, and if the concentration changes, either concentrate or thinner can be added. Since the difference in the degree of loading between the inserted and discharged fabric web can be determined beforehand and always remains approximately the same, an equal portion of the concentrate and thinner can be added continuously, according to the desired concentration. In this case, there is no need to measure the concentration. Together with the level regulation already mentioned, this ensures that the operating conditions in the treatment zone always remain the same.
  • the concentration of the peroxide liquor is preferably measured in the connection area between the two legs of the U-shaped shaft. There is enough space available and due to the turbulent flow there, the peroxide liquor is thoroughly mixed so that representative values are always measured.
  • the walls of the U-shaped shaft are heated, they being hollow walls can be formed through which a heating medium is passed.
  • the supply of the heating medium can be controlled via a temperature sensor in the shaft.
  • This heating device can also influence or regulate the temperature in the treatment zone in a particularly advantageous manner.
  • the temperature sensor is also arranged for the same reasons as the concentration sensor in the connection area between the two legs of the shaft.
  • the liquor concentration in the U-shaped shaft is advantageously kept at a value of 10 to 80 ml H 2 O 2 per liter of water.
  • Figure 1 shows an impregnation compartment 1, which has a U-shaped shaft.
  • the shaft is formed overall by the left manhole leg 3, the right manhole leg 4 and by the connecting area 5, which connects the two manhole legs.
  • the upper ends of the two shaft legs 3 and 4 are provided with a conical extension 22.
  • the shaft stands on a frame 14 and has a width which is somewhat greater than the width of the fabric web 2 to be treated (usable width), which can be approximately 1800 mm. With a shaft width of approx. 6 mm and an action length of 2200 mm, this results in a fleet content of approx. 96 l, which is obviously very little.
  • the fabric web 2 is introduced in the direction of arrow a via a guide roller 15 into the left shaft leg 3, deflected at a deflection roller 16 in the connection area and guided upwards again in the right shaft leg 4.
  • the fabric web is always stretched and does not touch the shaft walls.
  • the inner shaft walls 8 and 9 are fixedly arranged on the frame 14, while the outer shaft walls 6 and 7 can be displaced or pivoted outwards.
  • the loader consists of a fixed lower roller 18 and a press roller 19.
  • the press roller can be pressed against the lower roller 18 with the aid of a pressure cylinder 20.
  • a compression spring 21 causes the pressure roller 19 to be completely relieved in the absence of internal pressure in the pressure cylinder 20.
  • the level of the peroxide liquor is constantly measured with a level measuring device 13 at the upper end of one shaft leg.
  • a control valve 11 in a feed line 10 for new peroxide liquor can be activated via the level measuring device.
  • peroxide liquors of the same nature can be fed in via this line.
  • Advantageous results are achieved with a liquor concentration of 10 to 80 ml H 2 O 2 (35%) per liter of water.
  • the fleet consists of peroxide, alkali, stabilizer and possibly a wetting agent.
  • the pH value is greater than 10.
  • the supply line 10 opens into the spray pipes 12 and 12 ', which are arranged on both sides in the connecting area 5 and which preferably extend over the entire width of the shaft.
  • the peroxide liquor can be injected under pressure from these spray tubes.
  • the upper and lower ends of these shaft legs are connected to a line network 25.
  • the connections are made crosswise, so that the upper end of the left manhole leg 3 and the lower end of the right manhole leg 4 and the lower end of the left manhole leg 3 and the upper end of the right manhole leg 4 are combined.
  • a circulation pump 26 is integrated in the line network 25, so that the peroxide liquor in the shaft legs is set into a circular movement.
  • 23 peroxide liquor is drawn off from the exhaust pipes and pressed into the supply pipes 24. Obviously, this creates the opposite flow in the direction of the arrow b.
  • the circulating pump 26 is reversible, however, so that it is also possible to pump to the fabric web 2 in direct current.
  • the tubes 23 and 24 each open in pairs opposite one another in the shaft.
  • a heating element 47 is integrated in the line network 25 and can be heated with a heating medium via the line 32.
  • a temperature sensor 35 measures the temperature in the shaft and controls the control valve 34. The peroxide liquor can be heated in this way.
  • the shaft is connected to a storage container 27 which contains an increased concentration of peroxide liquor.
  • the connection is made via the line network 25.
  • the concentrate 29 can be fed into the line network via a feed pump 28.
  • a concentrate measuring device not shown here, has a concentrate measuring sensor 48 which is arranged in the connection area between the two shaft legs.
  • the feed pump 28 can be activated via this concentrate measuring device when the concentration drops.
  • the concentrate measuring device can also operate the control valve 11 when determining an increased concentration, with diluent being supplied via the supply line 10.
  • the feed pump 28 and the control valve 11 can also continuously supply a predetermined partial amount of concentrate and water, corresponding to the amount of peroxide liquor carried out when leaving the loading crimp 17.
  • the shaft walls 6 to 9 are only designed as simple plates, which may also be provided with stiffening elements.
  • a drain valve 30 is arranged on the floor.
  • damper 36 Immediately to the impregnation compartment 1 is a damper 36 which is known per se and which can have different designs.
  • the fabric web 2 is inserted into the damper 36 as directly as possible via an insertion slot 37.
  • FIG. 2 shows an alternative embodiment in which the shaft walls 6 to 9 are designed as hollow walls through which a heating medium such as steam can be passed. All other functions, in particular the liquid circulation in the shaft legs, the addition of new peroxide liquor and the regulation of the concentration are exactly the same as in the previous embodiment.
  • the shaft walls preferably consist of welded profile tubes 31, square tubes having proven particularly useful. In this way, a particularly great stability of the shaft walls is achieved.
  • the profiled tubes are connected to one another at the grain boundary surfaces, preferably in such a way that a meandering flow takes place.
  • Steam is supplied, for example, via a feed line 32 which opens into the hollow walls approximately in the lower region of the two shaft legs 3 and 4.
  • the movable outer walls 6 and 7 are connected to the fixed inner walls 8 and 9 via flexible lines, since the outer walls are movable.
  • the steam flows upwards in the hollow walls and is discharged again at a discharge line 33.
  • the fixed and sliding shaft walls are connected to one another via flexible cables.
  • a temperature sensor 35 is arranged in the shaft, which activates a control valve 34 in the supply line 32.
  • the peroxide liquor has a temperature of, for example, 60 to 80 ° C.
  • the goods speed can be about 30 to 150 m / min. be. This involves a deep penetration of the fabric web with the peroxide liquor.
  • a liquor content of approx. 90 to 100 liters was used, which, compared to the known bleaching baths of over 800 liters, results in bath turnover eight to nine times faster.
  • the working speed remains at approx. 120 m / min.
  • the fabric web is almost saturated. Monitoring the fleet concentration therefore no longer plays an outstanding role.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Paper (AREA)

Description

Die Erfindung betrifft ein Verfahren zum kontinuierlichen Bleichen einer textilen Gewebebahn mittels einer insbesondere alkalischen Peroxidflotte. Oxidationsbleichverfahren mit Hilfe von Peroxid (Wasserstoffsuperoxid) sind seit langem bekannt und weit verbreitet. Dabei werden überwiegend alkalische Bäder mit einem pH-Wert von mehr als 10 eingesetzt. Ein Beispiel eines Bleichverfahrens mit einer sauren Peroxidflotte ist in der US-A-4,060,385 beschrieben.The invention relates to a method for the continuous bleaching of a textile fabric web by means of a particularly alkaline peroxide liquor. Oxidation bleaching processes using peroxide (hydrogen superoxide) have long been known and widely used. Alkaline baths with a pH value of more than 10 are mainly used. An example of a bleaching process with an acidic peroxide liquor is described in US-A-4,060,385.

Die Peroxidbleiche erfordert relativ hohe Temperaturen für die Reaktion des Bleichmittels. Diese hohen Reaktionstemperaturen werden in einem Dämpfer aufgebracht. Vorher muss die Gewebebahn in einem Bad mit der Peroxidflotte imprägniert werden. Peroxidflotten haben jedoch die Eigenschaft, dass sie im allgemeinen bei höheren Temperaturen nicht über längere Zeit chemisch stabil bleiben. Bei den bisher bekannten Imprägnierverfahren wurden Bäder mit ca. 500 bis 1000 Litern Peroxidflotteninhalt verwendet. Dabei musste die Flottentemperatur sehr niedrig auf ca. 20 bis 40°C gehalten werden, um einen chemischen Zerfall der Flotte zu vermeiden. Ersichtlicherweise ist die Baderneuerung bei so grossen Badvolumen im Verhältnis sehr gering. Ein Nachteil der niedrigen Badtemperatur ist der relativ schlechte Flottenaustausch, der eine längere Verweilzeit in der Flotte erfordert, und der ineffiziente Wärmehaushalt, da anschliessend im Dämpfer wieder ein Aufheizen erforderlich ist. Ausserdem sind Bleichbäder mit grossem Flotteninhalt bezüglich Handhabung und Platzverbrauch relativ unrationell.Peroxide bleaching requires relatively high temperatures for the bleaching agent to react. These high reaction temperatures are applied in a damper. Before this, the fabric web must be impregnated with the peroxide liquor in a bath. However, peroxide liquors have the property that they generally do not remain chemically stable over a long period of time at higher temperatures. In the previously known impregnation processes, baths with approx. 500 to 1000 liters of peroxide liquor content were used. The liquor temperature had to be kept very low at approx. 20 to 40 ° C in order to avoid chemical breakdown of the liquor. Obviously, with such a large bathroom volume, the bathroom renovation is relatively small. A disadvantage of the low bath temperature is the relatively poor liquor exchange, which requires a longer residence time in the liquor, and the inefficient heat balance, since heating up is then required again in the steamer. In addition, bleach baths with a large liquor content are relatively inefficient in terms of handling and space consumption.

Es ist daher eine Aufgabe der Erfindung, ein Verfahren der eingangs genannten Art zu schaffen, bei dem bereits im Imprägnierbad mit hohen Temperaturen gearbeitet werden kann. Ausserdem soll der Flottenaustausch, also das Verhältnis der Konzentration auf der Ware zur Konzentration in der Flotte optimiert werden. Diese Aufgabe wird erfindungsgemäss mit einem Verfahren gelöst, das die Merkmale im Anspruch 1 aufweist.It is therefore an object of the invention to provide a method of to create the type mentioned, in which can be worked in the impregnating bath at high temperatures. In addition, the fleet exchange, i.e. the ratio of the concentration on the goods to the concentration in the fleet, is to be optimized. According to the invention, this object is achieved by a method which has the features in claim 1.

Die engen Schachtseitenwände des U-förmigen Schachtes bilden ersichtlicherweise ein Flottenbad mit einem sehr geringen Inhalt. Je nach dem Beladungsgrad der abgeführten Gewebebahn muss kontinuierlich neue Peroxidflotte zugeführt werden, was vorzugsweise unterhalb des Flottenniveaus erfolgt. Dadurch wird eine Schaumbildung vermieden. Das Verhältnis des Flottenverbrauchs zum Flottenvolumen ergibt eine vollständige Baderneuerung innert relativ kurzer Zeit, so dass das Bad auf Temperaturen von über 50°C, vorzugsweise sogar über 60°C gehalten werden kann. Bei diesen hohen Temperaturen wird ein optimaler Imprägnierungsgrad erreicht, was die Konzentrationsregulierung wesentlich vereinfacht. Die Gewebebahn trifft bereits mit einer hohen Temperatur in den nachfolgenden Dämpfer ein, so dass es dort nicht zu einer unerwünschten Abkühlung im Einzugsbereich kommt. Das sehr geringe Badvolumen ermöglicht übrigens auch einen Rezepturwechsel der Peroxidflotte innert sehr kurzer Zeit, da nur geringe Flüssigkeitsmengen ausgetauscht werden müssen.The narrow shaft side walls of the U-shaped shaft obviously form a liquor bath with very little content. Depending on the degree of loading of the removed web of fabric, new peroxide liquor must be added continuously, which is preferably done below the liquor level. This prevents foaming. The ratio of the fleet consumption to the fleet volume results in a complete bath renewal within a relatively short time, so that the bath can be kept at temperatures of above 50 ° C., preferably even above 60 ° C. An optimal degree of impregnation is achieved at these high temperatures, which considerably simplifies concentration regulation. The fabric web arrives at a high temperature in the subsequent damper so that there is no undesired cooling in the feed area. The very small bath volume also enables the peroxide liquor to be changed within a very short time, since only small amounts of liquid need to be exchanged.

Die Strömungsgeschwindigkeit in den Schenkeln des Schachtes relativ zur Gewebebahn kann auf einen bestimmten Wert eingestellt werden, um damit einen weiteren Behandlungseffekt zu erzielen. Mit einer Umwälzpumpe mit verstellbarer Förderleistung kann diese Strömungsgeschwindigkeit sogar verändert werden.The flow speed in the legs of the shaft relative to the fabric web can be set to a certain value in order to achieve a further treatment effect. This flow rate can even be changed with a circulating pump with adjustable delivery capacity.

Das Flottenniveau kann dauernd gemessen werden und es kann beim Absinken des Flottenniveaus neue Peroxidflotte zugeführt werden. Diese Zufuhr erfolgt besonder vorteilhaft im Verbindungsbereich zwischen den beiden Schenkeln des Schachtes. Es bildet sich dort eine turbulente Strömung, wobei die Gewebebahn intensiv und in der ganzen Tiefe mit Peroxidflotte beladen wird. Ausserdem kann in den Schenkeln des Schachtes entweder im Gegenstrom oder in Warenlaufrichtung im Gleichstrom zur Gewebebahn die Peroxidflotte an einem Ende abgeführt und am anderen Ende wieder zugeführt werden. Der Gegenstrombetrieb bewirkt einen sehr intensiven Flottenaustausch und eine turbulente Strömung auch in den Schenkeln des Schachtes. Dagegen bewirkt der Gleichstrombetrieb eine Unterstützung des Gewebetransports und damit eine besonders schonende Behandlung in der Behandlungszone.The liquor level can be measured continuously and new peroxide liquor can be added when the liquor level drops will. This supply takes place particularly advantageously in the connection area between the two legs of the shaft. A turbulent flow forms there, with the fabric web being loaded intensively and with depth of peroxide with the entire depth. In addition, the peroxide liquor can be discharged at one end in the legs of the shaft either in countercurrent or in the direction of flow in cocurrent to the fabric web and fed in again at the other end. The counter-current operation causes a very intensive fleet exchange and a turbulent flow even in the legs of the shaft. On the other hand, DC operation supports tissue transport and thus a particularly gentle treatment in the treatment zone.

Die Konzentration der Peroxidflotte kann permanent gemessen werden, wobei bei einer Veränderung der Konzentration entweder Konzentrat oder Verdünner zugeführt werden kann. Da die Differenz des Beladungsgrades zwischen eingeführter und abgeführter Gewebebahn vorher ermittelt werden kann und stets etwa gleich bleibt, kann auch dauernd eine gleiche Teilmenge Konzentrat und Verdünner, entsprechend der gewünschten Konzentration, zugeführt werden. Ein Messen der Konzentration fällt in diesem Fall weg. Zusammen mit der bereits erwähnten Niveauregulierung ist auf diese Weise gewährleistet, dass in der Behandlungszone stets gleichbleibende Betriebsbedingungen herrschen.The concentration of the peroxide liquor can be measured permanently, and if the concentration changes, either concentrate or thinner can be added. Since the difference in the degree of loading between the inserted and discharged fabric web can be determined beforehand and always remains approximately the same, an equal portion of the concentrate and thinner can be added continuously, according to the desired concentration. In this case, there is no need to measure the concentration. Together with the level regulation already mentioned, this ensures that the operating conditions in the treatment zone always remain the same.

Die Konzentration der Peroxidflotte wird vorzugsweise im Verbindungsbereich zwischen den beiden Schenkeln des U-förmigen Schachtes gemessen. Dort steht genügend Platz zur Verfügung und infolge der dort herrschenden turbulenten Strömung wird die Peroxidflotte intensiv durchmischt, so dass stets repräsentative Werte gemessen werden.The concentration of the peroxide liquor is preferably measured in the connection area between the two legs of the U-shaped shaft. There is enough space available and due to the turbulent flow there, the peroxide liquor is thoroughly mixed so that representative values are always measured.

Weitere Vorteile können erreicht werden, wenn die Wände des U-förmigen Schachtes beheizt werden, wobei sie als Hohlwände ausgebildet sein können, durch welche ein Heizmedium geleitet wird. Die Zufuhr des Heizmediums kann dabei über einen Temperaturfühler im Schacht geregelt werden. Durch diese Heizvorrichtung kann auch die Temperatur in der Behandlungszone auf besonders vorteilhafte Weise beeinflusst bzw. geregelt werden.Further advantages can be achieved if the walls of the U-shaped shaft are heated, they being hollow walls can be formed through which a heating medium is passed. The supply of the heating medium can be controlled via a temperature sensor in the shaft. This heating device can also influence or regulate the temperature in the treatment zone in a particularly advantageous manner.

Auch der Temperaturfühler wird aus den gleichen Gründen wie der Fühler für die Konzentration im Verbindungsbereich zwischen den beiden Schenkeln des Schachtes angeordnet.The temperature sensor is also arranged for the same reasons as the concentration sensor in the connection area between the two legs of the shaft.

Die Flottenkonzentration im U-förmigen Schacht wird vorteilhaft auf einem Wert von 10 bis 80 ml H2O2 pro Liter Wasser gehalten.The liquor concentration in the U-shaped shaft is advantageously kept at a value of 10 to 80 ml H 2 O 2 per liter of water.

Weitere Einzelmerkmale und Vorteile der Erfindung ergeben sich aus der nachstehenden Beschreibung und aus den Zeichnungen. Es zeigen:

Figur 1
einen stark vereinfachten Querschnitt durch eine Vorrichtung zur Durchführung des Verfahrens, und
Figur 2
ein alternatives Ausführungsbeispiel einer Vorrichtung mit heizbaren Schachtwänden.
Further individual features and advantages of the invention result from the following description and from the drawings. Show it:
Figure 1
a greatly simplified cross section through an apparatus for performing the method, and
Figure 2
an alternative embodiment of a device with heatable shaft walls.

Figur 1 zeigt ein Imprägnierabteil 1, das einen U-förmigen Schacht aufweist. Der Schacht wird insgesamt gebildet durch den linken Schachtschenkel 3, den rechten Schachtschenkel 4 und durch den Verbindungsbereich 5, der die beiden Schachtschenkel miteinander verbindet. Die oberen Enden der beiden Schachtschenkel 3 und 4 sind mit einer konischen Erweiterung 22 versehen. Der Schacht steht auf einem Gestell 14 und hat eine Breite, die etwas grösser ist als die Breite der zu behandelnden Gewebebahn 2 (Nutzbreite), die ca. 1800 mm betragen kann. Bei einer Schachtbreite von ca. 6 mm und einer Einwirkungslänge von 2200 mm ergibt sich derart ein Flotteninhalt von ca. 96 l, was ersichtlicherweise sehr wenig ist.Figure 1 shows an impregnation compartment 1, which has a U-shaped shaft. The shaft is formed overall by the left manhole leg 3, the right manhole leg 4 and by the connecting area 5, which connects the two manhole legs. The upper ends of the two shaft legs 3 and 4 are provided with a conical extension 22. The shaft stands on a frame 14 and has a width which is somewhat greater than the width of the fabric web 2 to be treated (usable width), which can be approximately 1800 mm. With a shaft width of approx. 6 mm and an action length of 2200 mm, this results in a fleet content of approx. 96 l, which is obviously very little.

Die Gewebebahn 2 wird in Pfeilrichtung a über eine Leitwalze 15 in den linken Schachtschenkel 3 eingeführt, an einer Umlenkwalze 16 im Verbindungsbereich umgelenkt und im rechten Schachtschenkel 4 wieder nach oben geführt. Die Gewebebahn ist dabei stets gestreckt und berührt die Schachtwände nicht. Wie in der prioritätsälteren EP-A-534 900 der Anmelderin genauer beschrieben ist, sind die inneren Schachtwände 8 und 9 fest auf dem Gestell 14 angeordnet, während die äusseren Schachtwände 6 und 7 nach aussen verschoben oder verschwenkt werden können.The fabric web 2 is introduced in the direction of arrow a via a guide roller 15 into the left shaft leg 3, deflected at a deflection roller 16 in the connection area and guided upwards again in the right shaft leg 4. The fabric web is always stretched and does not touch the shaft walls. As is described in more detail in the applicant's older EP-A-534 900, the inner shaft walls 8 and 9 are fixedly arranged on the frame 14, while the outer shaft walls 6 and 7 can be displaced or pivoted outwards.

Unmittelbar am oberen Ende des rechten Schachtschenkels 4 ist eine Beladungsquetsche 17 angeordnet, mit welcher der Beladungsgrad der Gewebebahn durch mehr oder weniger starkes Abquetschen bestimmt werden kann. Die Beladungsquetsche besteht aus einer festen Unterwalze 18 und aus einer Presswalze 19. Die Presswalze kann mit Hilfe eines Druckzylinders 20 gegen die Unterwalze 18 gepresst werden. Eine Druckfeder 21 bewirkt dabei, dass bei fehlendem Innendruck im Druckzylinder 20 die Presswalze 19 vollständig entlastet werden kann. Diese Anordnung ermöglicht es, dass die Presswalze auch nur leicht auf die Gewebebahn aufgelegt werden kann, so dass anstelle des Abquetschens nur ein Abstreifen von Peroxidflotte erfolgt. Die abgequetschte bzw. abgestreifte Peroxidflotte fliesst zurück in den rechten Schachtschenkel.Immediately at the upper end of the right manhole leg 4 is a loading squeeze 17, with which the degree of loading of the fabric web can be determined by squeezing to a greater or lesser extent. The loader consists of a fixed lower roller 18 and a press roller 19. The press roller can be pressed against the lower roller 18 with the aid of a pressure cylinder 20. A compression spring 21 causes the pressure roller 19 to be completely relieved in the absence of internal pressure in the pressure cylinder 20. This arrangement makes it possible for the press roller to be placed only slightly on the fabric web, so that instead of squeezing, the peroxide liquor is only wiped off. The squeezed or stripped peroxide liquor flows back into the right shaft leg.

Das Niveau der Peroxidflotte wird mit einer Niveau-Messvorrichtung 13 am oberen Ende des einen Schachtschenkels ständig gemessen. Über die Niveau-Messvorrichtung kann ein Regelventil 11 in einer Zufuhrleitung 10 für neue Peroxidflotte aktiviert werden. Über diese Leitung kann beim Absinken des Flottenniveaus Peroxidflotte von gleicher Beschaffenheit zugeführt werden. Es kann aber z.B. auch nur Verdünnungsflüssigkeit wie Wasser nachgeführt werden, während die richtige Konzentration der Peroxidflotte auf andere Weise aufrecht erhalten wird. Vorteilhafte Ergebnisse werden mit einer Flottenkonzentration von 10 bis 80 ml H2O2 (35 %) pro Liter Wasser erzielt. Die Flotte besteht dabei aus Peroxid, Alkali, Stabilisator und eventuell einem Netzmittel. Der pH-Wert ist grösser als 10. Die Zufuhrleitung 10 mündet in die Spritzrohre 12 und 12', die im Verbindungsbereich 5 auf beiden Seiten angeordnet sind, und die sich vorzugsweise über die ganze Breite des Schachtes erstrecken. Aus diesen Spritzrohren kann die Peroxidflotte unter Druck eingespritzt werden.The level of the peroxide liquor is constantly measured with a level measuring device 13 at the upper end of one shaft leg. A control valve 11 in a feed line 10 for new peroxide liquor can be activated via the level measuring device. When the fleet level drops, peroxide liquors of the same nature can be fed in via this line. However, it is also possible, for example, to only add dilution liquid such as water while maintaining the correct concentration the peroxide liquor is maintained in another way. Advantageous results are achieved with a liquor concentration of 10 to 80 ml H 2 O 2 (35%) per liter of water. The fleet consists of peroxide, alkali, stabilizer and possibly a wetting agent. The pH value is greater than 10. The supply line 10 opens into the spray pipes 12 and 12 ', which are arranged on both sides in the connecting area 5 and which preferably extend over the entire width of the shaft. The peroxide liquor can be injected under pressure from these spray tubes.

Um die Strömungsverhältnisse in den beiden Schachtschenkeln 3 und 4 zu beeinflussen, sind die oberen und die unteren Enden dieser Schachtschenkel an ein Leitungsnetz 25 angeschlossen. Die Anschlüsse erfolgen dabei kreuzweise, so dass das obere Ende des linken Schachtschenkels 3 und das untere Ende des rechten Schachtschenkels 4 und das untere Ende des linken Schachtschenkels 3 und das obere Ende des rechten Schachtschenkels 4 jeweils zusammengefasst sind. In das Leitungsnetz 25 ist eine Umwälzpumpe 26 integriert, so dass die Peroxidflotte in den Schachtschenkeln in eine Kreislaufbewegung versetzt wird. Für den besonders vorteilhaften Gegenstrombetrieb wird aus den Abzugrohren 23 Peroxidflotte abgesaugt und in die Zuführrohre 24 eingepresst. Dabei entsteht ersichtlicherweise die gegenläufige Strömung in Pfeilrichtung b. Die Umwälzpumpe 26 ist jedoch reversibel, so dass auch im Gleichstrom zur Gewebebahn 2 gepumpt werden kann. Die Rohre 23 und 24 münden jeweils paarweise einander etwa gegenüberliegend in den Schacht.In order to influence the flow conditions in the two shaft legs 3 and 4, the upper and lower ends of these shaft legs are connected to a line network 25. The connections are made crosswise, so that the upper end of the left manhole leg 3 and the lower end of the right manhole leg 4 and the lower end of the left manhole leg 3 and the upper end of the right manhole leg 4 are combined. A circulation pump 26 is integrated in the line network 25, so that the peroxide liquor in the shaft legs is set into a circular movement. For the particularly advantageous counterflow operation, 23 peroxide liquor is drawn off from the exhaust pipes and pressed into the supply pipes 24. Obviously, this creates the opposite flow in the direction of the arrow b. The circulating pump 26 is reversible, however, so that it is also possible to pump to the fabric web 2 in direct current. The tubes 23 and 24 each open in pairs opposite one another in the shaft.

Um auch bei diesem Ausführungsbeispiel eine Temperaturregelung zu gewährleisten, ist in das Leitungsnetz 25 ein Heizkörper 47 integriert, der über die Leitung 32 mit einem Heizmedium aufgeheizt werden kann. Ein Temperaturfühler 35 misst die Temperatur im Schacht und steuert das Regelventil 34 an. Auf diese Weise kann die Peroxidflotte geheizt werden.In order to ensure temperature control in this exemplary embodiment as well, a heating element 47 is integrated in the line network 25 and can be heated with a heating medium via the line 32. A temperature sensor 35 measures the temperature in the shaft and controls the control valve 34. The peroxide liquor can be heated in this way.

Zur Aufrechterhaltung einer bestimmten Konzentration der Peroxidflotte ist der Schacht mit einem Vorratsbehälter 27 verbunden, welcher Peroxidflotte erhöhter Konzentration beinhaltet. Beim vorliegenden Ausführungsbeispiel erfolgt der Anschluss über das Leitungsnetz 25. Das Konzentrat 29 kann über eine Förderpumpe 28 in das Leitungsnetz eingespeist werden. Eine hier nicht näher dargestellte Konzentratmessvorrichtung hat einen Konzentratmessfühler 48, der im Verbindungsbereich zwischen den beiden Schachtschenkeln angeordnet ist. Über diese Konzentratmessvorrichtung kann beim Absinken der Konzentration die Förderpumpe 28 aktiviert werden. Die Konzentratmessvorrichtung kann jedoch beim Feststellen einer erhöhten Konzentration auch das Regelventil 11 betätigen, wobei über die Zufuhrleitung 10 Verdünnungsmittel zugeführt wird.In order to maintain a certain concentration of the peroxide liquor, the shaft is connected to a storage container 27 which contains an increased concentration of peroxide liquor. In the present exemplary embodiment, the connection is made via the line network 25. The concentrate 29 can be fed into the line network via a feed pump 28. A concentrate measuring device, not shown here, has a concentrate measuring sensor 48 which is arranged in the connection area between the two shaft legs. The feed pump 28 can be activated via this concentrate measuring device when the concentration drops. However, the concentrate measuring device can also operate the control valve 11 when determining an increased concentration, with diluent being supplied via the supply line 10.

Alternativ können die Förderpumpe 28 und das Regelventil 11 auch dauernd eine vorbestimmte Teilmenge Konzentrat und Wasser zuführen, entsprechend der ausgeschleppten Menge Peroxidflotte beim Verlassen der Beladungsquetsche 17.Alternatively, the feed pump 28 and the control valve 11 can also continuously supply a predetermined partial amount of concentrate and water, corresponding to the amount of peroxide liquor carried out when leaving the loading crimp 17.

Beim vorliegenden Ausführungsbeispiel sind die Schachtwände 6 bis 9 lediglich als einfache Platten ausgebildet, die ggf. noch mit Versteifungselementen versehen sind. Um den Schacht beim Ausfahren der Aussenwände 6 und 7 entleeren zu können, ist am Boden ein Ablaufventil 30 angeordnet.In the present exemplary embodiment, the shaft walls 6 to 9 are only designed as simple plates, which may also be provided with stiffening elements. In order to be able to empty the shaft when the outer walls 6 and 7 are extended, a drain valve 30 is arranged on the floor.

Unmittelbar an das Imprägnierabteil 1 schliesst sich ein an sich bekannter Dämpfer 36 an, der unterschiedliche Bauformen aufweisen kann. Die Gewebebahn 2 wird möglichst auf direktem Wege über einen Einführschlitz 37 in den Dämpfer 36 eingeführt.Immediately to the impregnation compartment 1 is a damper 36 which is known per se and which can have different designs. The fabric web 2 is inserted into the damper 36 as directly as possible via an insertion slot 37.

In der Figur 2 ist ein alternatives Ausführungsbeispiel dargestellt, bei dem die Schachtwände 6 bis 9 als Hohlwände ausgebildet sind, durch welche ein Heizmedium wie z.B. Dampf geleitet werden kann. Alle übrigen Funktionen, insbesondere auch die Flüssigkeitsumwälzung in den Schachtschenkeln, die Zufuhr neuer Peroxidflotte und die Regelung der Konzentration sind genau gleich wie beim vorhergehenden Ausführungsbeispiel. Die Schachtwände bestehen vorzugsweise aus zusammengeschweissten Profilrohren 31, wobei sich Vierkantrohre besonders bewährt haben. Auf diese Weise wird auch eine besonders grosse Stabilität der Schachtwände erreicht. Die Profilrohre sind an den Bregrenzungsflächen über Bohrungen miteinander verbunden und zwar vorzugsweise so, dass eine mäanderförmige Strömung stattfindet.FIG. 2 shows an alternative embodiment in which the shaft walls 6 to 9 are designed as hollow walls through which a heating medium such as steam can be passed. All other functions, in particular the liquid circulation in the shaft legs, the addition of new peroxide liquor and the regulation of the concentration are exactly the same as in the previous embodiment. The shaft walls preferably consist of welded profile tubes 31, square tubes having proven particularly useful. In this way, a particularly great stability of the shaft walls is achieved. The profiled tubes are connected to one another at the grain boundary surfaces, preferably in such a way that a meandering flow takes place.

Die Zufuhr von Dampf erfolgt beispielsweise über eine Zufuhrleitung 32, die etwa im unteren Bereich der beiden Schachtschenkel 3 und 4 in die Hohlwände mündet. Die beweglichen Aussenwände 6 und 7 sind dabei über flexible Leitungen mit den festen Innenwänden 8 und 9 verbunden, da die Aussenwände ja verschiebbar sind. Der Dampf strömt in den Hohlwänden nach oben und wird an einer Abfuhrleitung 33 wieder abgeführt. Auch im oberen Bereich sind die festen und die verschiebbaren Schachtwände über flexible Leitungen miteinander verbunden. Um eine Temperaturregelung zu erreichen, ist im Schacht ein Temperaturfühler 35 angeordnet, der ein Regelventil 34 in der Zufuhrleitung 32 aktiviert.Steam is supplied, for example, via a feed line 32 which opens into the hollow walls approximately in the lower region of the two shaft legs 3 and 4. The movable outer walls 6 and 7 are connected to the fixed inner walls 8 and 9 via flexible lines, since the outer walls are movable. The steam flows upwards in the hollow walls and is discharged again at a discharge line 33. In the upper area, too, the fixed and sliding shaft walls are connected to one another via flexible cables. In order to achieve temperature control, a temperature sensor 35 is arranged in the shaft, which activates a control valve 34 in the supply line 32.

Beim kontinuierlichen Durchlaufen der Gewebebahn 2 durch das Imprägnierabteil 1 hat die Peroxidflotte eine Temperatur von beispielsweise 60 bis 80°C. Die Warengeschwindigkeit kann ca. 30 bis 150 m/min. betragen. Dabei findet eine tiefe Durchdringung der Gewebebahn mit der Peroxidflotte statt. In einer Versuchsanordnung wurde mit einem Flotteninhalt von ca. 90 bis 100 Litern gearbeitet, was gegenüber den bekannten Bleichebädern von über 800 Liter einen acht- bis neunfach schnelleren Badumsatz ergibt. Die Arbeitsgeschwindigkeit bleibt wie bei den bekannten Verfahren bei ca. 120 m/min. Beim dabei erreichten Flottenaustausch wird beinahe eine Sättigung der Gewebebahn erreicht. Die Ueberwachung der Flottenkonzentration spielt daher keine überragende Rolle mehr.When the fabric web 2 is continuously passed through the impregnation compartment 1, the peroxide liquor has a temperature of, for example, 60 to 80 ° C. The goods speed can be about 30 to 150 m / min. be. This involves a deep penetration of the fabric web with the peroxide liquor. In a test arrangement, a liquor content of approx. 90 to 100 liters was used, which, compared to the known bleaching baths of over 800 liters, results in bath turnover eight to nine times faster. As with the known methods, the working speed remains at approx. 120 m / min. When the fleet exchange is achieved, the fabric web is almost saturated. Monitoring the fleet concentration therefore no longer plays an outstanding role.

Claims (9)

  1. A method of continuously bleaching a textile fabric web (2) by means of an in particular alkaline peroxide bath characterised in that the fabric web is passed in a stretched condition through a U-shaped shaft (3, 4, 5) whose side walls closely embrace the fabric web and which is filled with the peroxide bath, that the peroxide bath in the shaft is maintained at a temperature of over 50°C, that fresh peroxide bath is supplied preferably below the level of the bath to maintain the volume of bath in the shaft constant, and that the impregnated fabric web is fed to a steamer (36) after leaving the shaft.
  2. A method according to claim 1 characterised in that the peroxide bath is supplied and removed respectively on both sides of the fabric web in the legs of the shaft.
  3. A method according to one of claims 1 and 2 characterised in that the level of the bath is measured and that when the level of the bath sinks fresh peroxide bath is introduced in the connecting region (5) between the two legs (3, 4) of the shaft.
  4. A method according to one of claims 1 to 3 characterised in that the concentration of the peroxide bath is measured and that upon a variation in concentration either concentrate or diluent is added.
  5. A method according to claim 4 characterised in that the concentration of the peroxide bath is measured in the connecting region (5) between the two legs of the shaft.
  6. A method according to one of claims 1 to 3 characterised in that an equal amount of concentrate or diluent is added continuously in accordance with the previously ascertained difference in the degree of charging between the fabric web when it is introduced and removed.
  7. A method according to one of claims 1 to 6 characterised in that in both legs (3, 4) of the shaft the peroxide bath is removed at one end and added at the other end selectively in counter-flow relationship or in co-flow relationship with the fabric web (2).
  8. A method according to one of claims 1 to 3 characterised in that the walls (6 to 9) of the U-shaped shaft are heated.
  9. A method according to one of claims 1 to 8 characterised in that the bath concentration is maintained at a value of 10 to 80 ml H2O2 (35%) per litre of water.
EP19940810094 1993-03-03 1994-02-18 Method for continuously bleaching a textile web by use of an alkaline solution of hydrogen peroxide Expired - Lifetime EP0615016B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH632/93 1993-03-03
CH63293 1993-03-03

Publications (2)

Publication Number Publication Date
EP0615016A1 EP0615016A1 (en) 1994-09-14
EP0615016B1 true EP0615016B1 (en) 1996-08-28

Family

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Application Number Title Priority Date Filing Date
EP19940810094 Expired - Lifetime EP0615016B1 (en) 1993-03-03 1994-02-18 Method for continuously bleaching a textile web by use of an alkaline solution of hydrogen peroxide

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EP (1) EP0615016B1 (en)
JP (1) JPH073611A (en)
DE (1) DE59400532D1 (en)
ES (1) ES2091112T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1010795A3 (en) 1998-12-14 2001-06-13 Tve-Escale Europe, S.A. Machine for the scouring and bleaching of webs of fabric and the like

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4060385A (en) * 1972-12-06 1977-11-29 Jerome Katz Method for hydrogen peroxide bleaching in acid or neutral solutions
JPS528184A (en) * 1975-07-09 1977-01-21 Nippon Dyeing Machine Mfg Co Apparatus for continuously treating broad textile goods
FR2626020B1 (en) * 1988-01-20 1990-05-04 Protex Manuf Prod Chimiq IMPROVED PROCESS FOR BLEACHING CELLULOSIC FIBERS USING HYDROGEN PEROXIDE IN AN ALKALINE MEDIUM
NL9001133A (en) * 1990-05-14 1991-12-02 Brugman Machinefabriek Bv METHOD FOR DETERMINING AND CONTROLLING THE HYDROXYLES HYDROGEN PEROXIDE CENTER IN BLEACH BATHS AND DEVICE FOR TREATING TEXTILE PATHS.

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ES2091112T3 (en) 1996-10-16
DE59400532D1 (en) 1996-10-02
EP0615016A1 (en) 1994-09-14
JPH073611A (en) 1995-01-06

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