EP0120894B1 - Device for dyeing continuously fed band products - Google Patents

Abstract

The device according to the invention comprises a container (13) having an upper part (16) wherein a liquid dye is held and a lower part (17) wherein are arranged heating pipes (18) intended to provide a uniform heating of the bottom (15). Above the liquid are arranged walls (48, 49, 50, 51, 52) which define guiding channels for the foam generated by a nozzle (20), which channels become narrower from bottom to top. The product to be treated (25) fed in the direction of the arrow (A) is subjected to a multilayer treatment in the different successive guiding channels.

Description

The present invention relates to a device for dyeing continuously moving products, in particular textile materials, comprising a receptacle open at its upper part and containing organs for generating a dye foam, a guide device for bringing the foam into contact with the tinting products, and drive means for continuously scrolling the tinting products above the upper opening of the container.

In recent years, considerable efforts have been made to reduce the quantities of water used as a dye carrier or other chemicals commonly used in the industry, particularly in the textile industry. For this purpose, processes and machines have been developed using a dyeing substance in the foam state for dyeing textiles in the form of threads or woven products, or any other product such as for example strips of paper.

Such a process is for example described in American patent US-A-3697314 which presents a device comprising a foam generating container, guide conduits which bring the coloring foam up to a slot by which this foam is discharged under pressure to impregnate continuously transported wires in the vicinity of this slot.

Another device described for example in American patent US-A-3954404 comprises a tank for impregnating a strip of continuously moving fabric, this tank containing a coloring foam, a steam treatment chamber intended to fix the dyes and fabric wash tanks.

American patent US-A-4158076 relates to a device for dyeing or printing a strip of paper by means of a dyeing material in the foam state, which is generated in a tank and led to a passage constricted adjacent to the tinting surface of the paper web, whereby the foam is forced in a direction opposite to the direction of movement of the paper web.

All these documents show that it is known to generate coloring foam in a tank and either to maintain this foam in the tank and to immerse the product to be tinted, or to guide this foam to apply it under pressure. against the surface of the product to be tinted.

The numerous experiments carried out have not always been conclusive. On the one hand, the quality of the foam, and in particular its homogeneity, is very variable depending on the level of the bath of raw materials used for making the foam and contained in the tank, and according to the temperature of this bath .

In fact, the foam is usually generated by a mixer placed inside the application machine on a product, and is transported through more or less long tubes to the point of application. As a result, the bubbles tend to burst during transport and there is the appearance of areas in which the dye is more concentrated, which causes color irregularities or streaks on the treated product.

In known devices, the tank generally contains pipes of heat exchangers which make it possible to bring and maintain this bath at a predetermined temperature. However, it has been found that the turbulence generated around and above these pipes modifies the quality of the foam and prevents the creation of a homogeneous foam. However, the application of non-homogeneous foam causes an irregular dyeing and in particular generates clearly visible streaks on the surface of the treated product.

Furthermore, in certain known systems, the foam is highly constrained through a narrow passage, in which the bubbles of this foam are crushed between a roller and the surface of the product to be tinted. Since compression cannot be uniform since it fluctuates with variations in the quality of the material treated or in the tension exerted on it by the mechanism for transporting this material, the dye generally does not apply uniformly, which negatively affects the quality of the finished product.

In addition, when the foam is pushed through a narrow slit, significant hydrophysical forces act on this foam in the area where the product to be treated comes into contact with the lip of the slit. The foam does not react uniformly to these forces over the entire length of the slit, which can cause build-up of liquid stain and cause streaks to mark the surface of the product.

The present invention proposes to overcome the various aforementioned drawbacks and realizes a device making it possible to generate a very homogeneous foam and to apply this foam according to a principle of multilayer coating on a support to be tinted, which results in an effective, deep dyeing. and very homogeneous.

These objects are achieved by the device according to the invention, characterized in that the foam guiding device comprises partitions arranged above the container containing the foam generating members, these walls defining at least two adjacent corridors which narrow from below above, and in that the container is provided with a device for regulating the temperature of the dye contained in this container.

The presence of several adjacent corridors, at the upper end of which the foam bubbles crash and deposit their coloring substance, makes it possible to carry out the dyeing in several successive stages and in particular to apply several successive layers of dyeing.

• La fig. 1 représente une vue coupée en élévation du dispositif selon l'invention,
• La fig. 2 représente une vue partielle en coupe illustrant un autre mode de fixation des cloisons définissant les couloirs de guidage de la mousse, La fig. 3 représente une variante de ce dispositif prévue pour le traitement de produits non poreux,
• La fig. 4 illustre une autre forme de réalisation du dispositif selon l'invention, spécialement prévue pour traiter des produits à fibres serrées, perpendiculaires au sens de défilement, et
• La fig. 5 illustre schématiquement un perfectionnement utile dans certaines conditions.

The present invention will be better understood with reference to the description of a preferred embodiment and the attached drawing, in which:

• Fig. 1 represents a cut view in elevation of the device according to the invention,
• Fig. 2 represents a partial sectional view illustrating another method of fixing the partitions defining the foam guideways, Fig. 3 represents a variant of this device intended for the treatment of non-porous products,
• Fig. 4 illustrates another embodiment of the device according to the invention, specially provided for treating products with tight fibers, perpendicular to the direction of travel, and
• Fig. 5 schematically illustrates an improvement useful under certain conditions.

With reference to fig. 1, the device 10 essentially comprises a chassis illustrated schematically by two supports 11 carrying a base plate 12, on which is mounted the container 13 containing the liquid dye used as raw material for generating the dye foam. The container 13 consists of a tank 14, inside which is mounted a bottom plate 15 which delimits an upper zone containing the liquid dye 16, and a lower zone 17 in which are provided heating pipes 18 embedded by example in an oil bath maintained in permanent circulation by a pump through a closed circuit.

In the upper part of the tank 14 are arranged on the one hand the outlets 19 of conduits for supplying the liquid dye 16, and on the other hand an air injection nozzle 20 constituted by a tubular element provided with 'A large number of very small opening holes, which allows to inject, in a controlled manner, pressurized air into the liquid dye 16 to generate a foam which will develop above the surface of the liquid.

In known devices, heating pipes immerse in the liquid dye, which has the disadvantage, as mentioned above, of causing undesirable turbulence. In the present device, the heating pipes are arranged in the cavity 17 below the bottom plate 15, which is heated uniformly by radiation or by convection. This bottom 15 is brought to a regular temperature over its entire surface, which makes it possible to cause a gentle heating of the liquid contained in the tank 14, thus eliminating the zones of strong turbulence capable of modifying the shape of the bubbles and consequently the quality of the foam generated. It has been found experimentally that the ideal temperature is between 65 and 80 ° C and is preferably close to 71 ± 2 ° C. At this temperature, the fixing of the dye, between 70 and 95%, is very good, which makes it possible to avoid any subsequent fixing treatment with steam.

The side walls of the container 13 extend upwards, on the sides by two vertical panels (not shown), forwards by an inclined wall 21 and rearwards by the drum 22 and by the flexible scraper 23 which takes bearing against the surface of the drum 22. The inclined partition 21 carries, at its upper end, a front plate 24 bevelled at the front, the flat upper surface of which is in the horizontal plane tangential to the drum 22. The product to be tinted, in the form of a continuous strip 25, flows in the direction of arrow A, taken between the driven drum 22 and the pressure roller 26. The pressure roller 26 is constituted by a cylinder with an axis 27 carried by two lateral flanges 28 integral a support 29 pivoting about an axis 30. A height adjustment device, comprising a vertical screw 31 whose head is fixed by a support 32 on a column 33, makes it possible to adjust the height of the pressure roller 26. This roller is coated an annular layer 34 of an elastic material such as for example neoprene. The pressing pressure of the pressing roller 26 on the drum 22 is precisely adjustable using the adjustment device comprising the screw 31, or by any other similar means allowing the same result to be obtained.

The height adjustment screw makes it possible to block the pressure roller in a determined position, for example by means of calibration gauges, with the aid of which the height of the slot formed between the drum 22 and the pressure roller 26 is measured. height of this slit depends on the thickness of the product treated and the more or less strong pressure that we want or can exert on the product. The roller 26 can be driven or can rotate freely under the effect of friction. It is however essential that the drum 22 and the roller 26 have the same peripheral speed.

In the zone corresponding to the upper opening of the container 13, the product strip 25 is retained by a grid 35 stretched between two rollers 36 and 37 by means of a mechanical tensioner 38 known per se. In the example described, this tensioner consists of two jaws 39 and 40 connected by a threaded rod 41 secured to an adjustment nut 42. In such a device, the rotation of the nut 42 in one direction causes the spacing of the two jaws 39 and 40, and the rotation of the nut 42 in the opposite direction causes the two jaws 39 and 40 to come together. This tensioner-grid assembly is mounted on two flanges 43 movable in height thanks to a sliding system comprising oblong slots 44 and rods 45 engaged in these slots. The assembly is supported by a transverse beam 46 supported by the columns 33.

In the space arranged above the level of the liquid in the tank 14, a level which is precisely controlled by an ultrasonic device 47 shown diagrammatically, there are a series of partition walls 48, 49, 50, 51 and 52 These partitions are rigidly held by supports 53 and 54 comprising a central rod and nuts engaged on this rod and the lengths of which are determined so as to ensure a precisely defined position of the above-mentioned partitions. These partitions, the first two 48 and 49 of which are curved at their upper part to adapt at least partially to the curvature of the surface of the drum 22, are designed and arranged in such a way that the foam guideways that they define, for example, a width at their base which is substantially double their width at their upper part.

This relationship between widths is not, however, immutable. The width of the corridors at their top can vary from one corridor to the next. Since the absorption of coloring matter by the treated product is particularly important above the first guide lane, and decreases as the product advances in the machine because its porosities are gradually closed, it is advantageous to reduce proportionally the quantity of foam available in the lanes successive and increase the pressure in these lanes. This effect is obtained by placing the partition walls in relation to each other, so that their width at the base decreases in the direction of movement of the product (arrow A). The decrease ratio may for example be between 5 and 50%, but is preferably around 20%. The width at the top of the corridors can be equal to half their width at the base. However, the widths of the corridors at their top can be equal to a variable percentage of the widths of these same corridors at their base. Thus, the width at the top of the first corridor can represent 80% of the width of this corridor at its base. The width at the top of the second corridor can be equal to 70% of the width of this corridor at its base. For the third lane the proportion is 60%, for the fourth lane it is 50%, for the fifth lane it is 40% and for the sixth and last lane it represents 30%.

This variable relationship of the widths of the foam guideways makes it possible to modulate the speed of rise of this foam and to avoid accumulations.

Since the positions of the partitions can be decisive for the quality of the product, it is possible to provide means for fixing these walls allowing rapid, manual or automatic modification of these positions. Such an assembly is easy to carry out by those skilled in the art.

In operation, the foam generation system has been surrounded by a maximum of precautions so that this foam is homogeneous. For this purpose, as mentioned above, the container has a bottom plate 15 which allows uniform heating and suppresses the troublesome turbulence inside the liquid. In addition, the level in the tank is precisely controlled by an ultrasonic device. which contributes to having a constant quality and good homogeneity of the foam generated. For the same purpose, the base liquor, that is to say the liquid dye 16 contained in the tank 14, is constantly recycled and kept in circulation through the supply conduits, the outlets 19 of which open into the tank 14 and the flow conduit 55. Next, the partition walls 48, 49, 50, 51 and 52 restrict themselves upwards, which tends to constrict the bubbles of the foam and contributes, in a non-negligible manner, to further homogenize the foam near its application area. Finally, the existence of a series of foam guide corridors allows application in several superimposed layers of the dye substance and very good penetration of the dye into the material to be tinted. Indeed, the strip 25, flowing in the direction of the arrow A, is first subjected to a first treatment with the foam located in the corridor defined by the wall 52 and the front wall 21, then subjected to the action of the foam present in the guide corridor defined by the partitions 51 and 52, then to that of the corridor defined by the partitions 50 and 51, then to that contained in the guide corridor defined by the partitions 49 and 50, then to that of the guide corridor defined by the partitions 48 and 49 and finally that contained in the guide corridor defined by the partition 48 and the scraper 23. Thus, the product in strip 25 or in the state of wire or occurring in any suitable form is subjected to a multilayer treatment, which makes it possible to obtain a high quality surface finish. The upper ends of the partition walls are spaced a few millimeters from the bottom surface of the product. In this way, the foam is spread against this surface as with a spatula.

In some cases, to obtain certain special effects, it may be advantageous not to achieve a uniform dye, but rather an irregular "flaking", without any reason. Such a dye is of interest in the textile industry but also in the wallpaper industry, where papers with a mottled background are frequently produced. Such an effect is obtained by modulating the speed of movement of the product 25. If the speed of a strip of fabric or paper is sufficiently high, the quantities of foam produced are absorbed faster than they are produced. Foam-free cavities are formed in the guideways and this results in an irregular dyeing, a "flaking" composed of more or less clear or tinted touches.

With the help of a device as described "it is possible to make a flocking of a color. To make polychrome flocking, it suffices to have two or more similar machines in series, each applying its colored keys to the surface exposed above the foam guideway.

If the treatment is carried out at high temperature, each color is fixed at least 75% at the outlet of the corresponding device. However, if it is desired to obtain combinations of colors, it is sufficient to lower the temperature and to fix the colors by a steam fixing device, placed in the extension of the tinting machines.

Therefore, the possibilities of this device are very vast. All kinds of special effects are possible without the user being forced to make significant and expensive transformations.

In the example of fig. 2, all the essential elements are identical to the corresponding elements in FIG. 1. The only difference is the method of fixing the partitions 48, 49, 50, 51 and 52 which are fixed in position using rails 48 ', 49', 50 ', 51' and 52 'secured to the side panels (not shown) which laterally delimit the container 13 and the space containing the foam surmounting this container.

In the two embodiments described above, the container 13 has at its base a conduit 55. The drum 22 rests on a support drum 9 preferably provided with a coating with a high coefficient of friction, such as for example neoprene. In addition, these devices are preferably equipped with an automatic command and control device for the foam generator. Three parameters are essential to this control: the pressure of the foam, the volume of air injected and the speed of movement of the product. Regular measurement of the pressure of the foam and the speed of travel of the product and an automatic interpretation of the results of the measurements by a central computer make it possible to automate the injection of air into the injector 20 and to control so specifies the generation of foam according to the effects that one wants to obtain.

In the case of non-porous products, such as for example thick paper, which one wishes to tint in two colors, it is advantageous to use an installation as shown diagrammatically in FIG. 3. It comprises two devices 101 and 102 such as those described above with reference to FIGS. 1 or 2, each working with a color. A roll of paper 103 is carried by a support 104 of a type known per se, unrolls a strip of paper 105 stretched between a drum 106 and a drum 107. The two drums 106 and 107 cooperate with a third drum 108 to tension a rotary grid 109, for example made of polyester or any other suitable material, which serves as a support for the paper strip 105 during its journey over the dyeing devices 101 and 102. A rinsing installation 110 and a drying ventilation 111 are arranged on the return route of the grid 109.

A pressure roller 112, rotating at the same speed as the drum 107, applies the paper to the peripheral surface of this drum. Ramps of heating by infrared radiation 113 ensure a pre-drying of the tinted paper before it passes through a drying device (not shown).

To treat a weakly or non-porous material, it is essential that the foam bubbles can burst and release their coloring substance on contact with the product to be treated, as well as the air they contain. To promote this bursting of bubbles, they are caused to expand by heating the product with the aid of a heating plate 114 arranged parallel above the strip 105. This plate is placed above and at the front of the dye 101 and 102 and causes the paper to preheat.

FIG. 4 illustrates a device in which the grid 35 of FIG. 1 is replaced by a cylindrical grid 201. A strip of product 202, comprising a flat base and bristles erected vertically with respect to this base, is stretched between two drums 203 and 204 and the cylindrical grid 201, and passes over foam guide corridors 205,206,207 and 208. Thanks to its passage on the rotary grid 201, the bristles of the product 202 open and allow good penetration of the foam, and therefore a deep dyeing and quality of the product. This technique will be used advantageously for carpets or fabrics of the velvet type.

Fig. 5 illustrates an advantageous improvement to avoid the formation of foam accumulation zones at the top of the guide corridors. This improvement consists in making partition walls 301 with double walls 302 and 303, which define a suction channel connected to a suction duct 304, through which the foam present in the guide passage is recycled. By this process, a slow and permanent circulation of the foam is created, the homogeneity and quality of which are guaranteed by constant regeneration. These channels also make it possible to evacuate the air released by the bursting of the bubbles.

This improvement can be reported on each of the preceding devices described above. Likewise, a complex installation may include several stages of dyeing carried out using one or more of the devices described above.

Claims (36)

1. Device for dyeing continuously fed ribbon products, particularly textile materials, comprising at least one container with an open upper portion and having means for generating foam dye, at least one flow means to cause the foam to contact the products to be dyed, and drive means for continuously feeding the products to be dyed above the upper opening in the container, characterized by the fact that the flow means for the foam comprises separating walls disposed above the container holding the foam generating means, said walls defining at least two adjacent channels which become narrower from bottom to top, and by the fact that the container is provided with a means for regulating the temperature of the dye within the container.

2. Apparatus according to claim 1, characterized by the fact that the separating walls are at least partially inclined in the direction of displacement of the products to be dyed.

3. Apparatus according to claim 1, characterized by the fact that each channel comprises a first opening adjacent the upper opening of the container holding the dyeing material, and a second opening adjacent the lower surface of the product to be dyed, and by the fact that the width of the second opening is 25% to 75% smaller than the width of the first opening.

4. Apparatus according to claim 3, characterized by the fact that it comprises several adjacent channels, each one of which has a first opening adjacent the foam generating container and a second opening adjacent the product to be dyed, and by the fact that the respective widths of the lower openings and the upper lower openings decrease in the direction of movement of the product to be dyed.

5. Device according to claim 4, characterized by the fact that the widths of the lower openings decrease, the width of each one of these openings being from 5% to 50% smaller than the preceding opening.

6. Device according to claim 4, characterized by the fact that the widths of the upper openings are proportional to the corresponding widths of the lower openings, and by the fact that the proportional relationship decreases in the direction of movement of the product to be treated.

7. Device according to claim 1, characterized by the fact that the container comprises a base wall which defines an upper zone or vat containing the raw material from which the foam dye is produced, and containing the means necessary to produce said foam, and a second lower zone containing heating elements disposed to uniformly heat said base wall.

8. Device according to claim 7, characterized by the fact that the lower zone contains a liquid of high caloric capacity, by the fact that this lower zone forms a portion of a closed circuit, comprising a circulation pump for the liquid, measuring means and temperature control means.

9. Device according to claim 1, characterized by the fact that it comprises a pressure cylinder held by a pivotable support and a pressure regulating means, disposed to regulate the thickness of an opening through which the product passes after being treated with the foam dye, the opening being situated between the peripheral surface of the pressure cylinder and the peripheral surface of a drum defining the wall of the outlet of the container containing the foam generating means.

10. Device according to claim 1, characterized by the fact that it comprises a fixed net provided with a stretcher, said net being disposed above the upper opening of the flow channels for the foam and in contact with the surface of the products for dyeing which is not exposed to the foam.

11. Device according to claim 1, characterized by the fact that it comprises an ultrasound level regulator to control the level of liquid dye in the container.

12. Device according to claim 1, characterized by the fact that the foam generating means comprises a tubular injector having a series of very small openings, this tube being horizontally disposed, submerged in the liquid dye and connected to a source of compressed air.

13. Device according to claim 12, characterized by the fact that it comprises a unit for measuring and controlling the volume of air injected by the injector, said unit comprising means for measuring and interpreting the pressure of the foam above the vat, and means for measuring and interpreting speed at which the product to be dyed is fed, and by the fact that this measuring means is disposed to control the volume of air injected as a function of foam pressure and speed of product displacement.

14. Device according to claim 1, characterized by the fact that it comprises several containers with open upper portions and containing means for generating a dye foam, each of the containers being located below a means for flowing the corresponding foam, said containers being arranged in series, so that the product to be dyed successively passes above the flow channels for the foam produced in the different containers.

15. Device according to claim 1, characterized by the fact that it comprises a heating plate disposed upstream of and above the flow channels for the foam, parallel to the direction of movement of the product to be dyed.

16. Device according to claim 15, characterized by the fact that it comprises a net which serves as a support for the product to be dyed, said net being moved along simultaneously with the product, above the flow channels for the foam.

17. Device according to claim 1, characterized by the fact that each separating wall comprises two partitions forming an opening therebetween,

3. Einrichtung gemäss Anspruch 1, dadurch gekennzeichnet, dass jede Kammer eine erste Offnung hat, welche an die obere Offnung des Behälters, der die Färbesubstanz enthalt, angrenzt, und eine zweite Öffnung besitzt, welche an die Unterseite des zu färbende Produktes angrenzt, und dadurch, dass die Breite der zweite Offnung in Bezug auf die Breite der ersten Offnung und 25% bis 75% reduziert ist.

4. Einrichtung gemäss Anspruch 3, dadurch gekennzeichnet, dass sie aus mehreren aneinandergrenzenden Kammern besteht, von denen jede eine erste Öffnung, welche an den Behälterbereich mit Schaumerzeugung grenzt, und eine zweite Offnung besitzt, welche an das zu färbende Erzeugnis grenzt, und dadurch, dass die jeweiligen Breiten der unteren und oberen Offnungen abnehmen, und zwar in Durchlaufrichtung des zu far- benden Erzeugnisses.

5. Einrichtung gemäss Anspruch 4, dadurch gekennzeichnet, dass die Breiten der unteren Offnungen abnehmen, und zwar ist jede Breite einer dieser Offnungen um 5% bis 50% reduziert, bezo- gen auf die Breite der vorhergehenden Offnung.

6. Einrichtung gemäss Anspruch 4, dadurch gekennzeichnet, dass die Breiten der oberen Offnungen proportional zu den entsprechenden Breiten der unteren Offnungen sind und dadurch, dass das Proportionalitätsverhältnis in Durchlaufrichtung des zu färbenden Produktes abnimmt.

7. Einrichtung gemäss Anspruch 1, dadurch gekennzeichnet, dass der Behälter eine trenn- wandartige Platte hat, die einen oberen Bereich oder Wanne, welche den Rohstoff zur Erzeugung des Färbeschaumes und die Organe, welche zur herstellung dieses Schaumes benötigt werden, enthält, und einen zweiten, unteren Bereich, in dem die Heizelemente zum gleichmässigen Erwar- men dieser Platte untergebracht sind, trennt.

8. Einrichtung gemäss Anspruch 7, dadurch gekennzeichnet, dass sich im unteren Bereich eine Flüssigkeit mit grosser Wärmekapazität befindet und dadurch, dass dieser untere Bereich in einen geschlossenen Kreislauf integriert ist, zu dem eine Zirkulationspumpe für die Flüssigkeit und Instru- mente zum Messen und Kontrollieren der Tempe- ratur gehören.

9. Einrichtung gemäss Anspruch 1, dadurch gekennzeichnet, dass sie aus einer Andrückwalze, die an einer schwenkbaren Halterung befestigt ist, und aus Teilen zum Einstellen der Höhe besteht, welche angebracht sind, um die Stärke eines Schlitzes zu regulieren, durch den das Produkt nach seiner Behandlung mit dem Farbeschaum hindurchgeht und der zwischen Andrückrollen- oberfläche und der oberfläche einer walze vorhanden ist, welche am Behälterausgang als wandarti- ge Abgrenzung für den Behälterbereich dient, der die schaumerzeugenden Organe enthält.

10. Einrichtung gemäss Anspruch 1, dadurch gekennzeichnet, dass sie aus einem verstellbaren Gitter besteht, das mit einer Spannvorrichtung ver- sehen ist, wobei sich dieses Gitter über der oberen Offnung der Rammern befindet, die als Fuhrung für den Schaum dienen, und gegen die Fläche der zu färbenden Erzeugnisse drückt, die der Schaum- behandlung nicht ausgesetzt ist.

11. Einrichtung gemäss Anspruch 1, dadurch gekennzeichnet, dass sie einen Ultraschall-H6henregler besitzt, um die Höhe der Flüssigfarbe im behälter zu überwachen.

12. Einrichtung gemäss Anspruch 1, dadurch gekennzeichnet, dass die schaumerzeugenden Organe aus einem Rohr mit Injektionsfunktion beste- hen, das mit einer Reihe feiner Offnungen verse- hen ist, wobei dieses horizontal angebrachte Rohr mit Düsen in der flüssigen Farbe versenkt und mit einer Druckluftquelle verbunden ist.

13. Einrichtung gemäss Anspruch 12, dadurch gekennzeichnet, dass sie eine Einheit zum Messen und Steuern der Luftmenge beinhaltet, welche durch das Rohr mit Düsen zugeführt wird, wobei diese Einheit Organe zur Druckmessung und -auswertung des schaumes über der Wanne und Organe zur Messung und Auswertung der Ge- schwindigkeit besitzt, mit welcher das zu färbende Erzeugnis durchläuft, und dadurch, dass diese Messeinheit dazu da ist, die injizierte Luftmenge in Abhängigkeit vom Druck des Schaumes und der Durchlaufgeschwindigkeit des Produktes zu steuern.

14. Einrichtung gemäss Anspruch 1, dadurch gekennzeichnet, dass sie aus mehreren, in ihrem oberen Teil offenen Sehältern besteht und Organe zum Herstellen eines Färbeschaumes hat, wobei sich über jedem dieser Behälter eine Führungsvorrichtung für den entsprechenden Schaum befindet und wobei sich diese Behälter hintereinander befinden, so dass das zu färbende Produkt nachein- ander die Kammern passiert, welche als Führung für den Schaum dienen, der in den verschiedenen Behältern erzeugt wird.

15. Einrichtung gemäss Anspruch 1, dadurch gekennzeichnet, dass sie eine Heizplatte besitzt, die sich oberhalb der Führungskammern für den Schaum befindet, parallel zur Durchlaufrichtung des zu färbenden Erzeugnisses.

16. Einrichtung gemäss Anspruch 15, dadurch gekennzeichnet, dass sie ein Gitter beinhaltet, welches als Auflage far das zu färbende Produkt dient, wobei dieses Gitter gleichzeitig bewegt wird wie das Erzeugnis über den Kammern, die als Führung für den Schaum dienen.

17. Einrichtung gemäss Anspruch 1, dadurch gekennzeichnet, dass jede Trennwand aus zwei Wandelementen besteht, zwischen denen ein Hohlraum vorhanden ist, wobei besagter Hohlraum zum oberen Ende der Trennwand hin geöff- net ist und nach unten an eine Saugvorrichtung angeschlossen ist, welche mit einem Speicher mit Flüssigfarbe verbunden ist.

18. Einrichtung gemäss Anspruch 1, dadurch gekennzeichnet, dass sie einen Umwälzkreislauf für die flüssige Farbe besitzt, wobei dieser Kreislauf eine Zirkulationspumpe hat, welche dazu da ist, eine verstärkte Umwälzung der Farbezwischen Speicher und Wanne des Behälters zu bewirken.

19. Einrichtung gemäss Anspruch 1, dadurch gekennzeichnet, dass sie aus einem sich drehen- den, zylinderförmigen Gitter besteht, das sich über this opening being open in the area of the upper extremity of the separating wall and connected at its base to a suction means, which is connected to a reservoir of liquid dye.

18. Device according to claim 1, characterized by the fact that it comprises a circuit for recycling the liquid dye, this circuit consisting of a circulation pump disposed to cause forced circulation of the dye between a reservoir and the vat portion of the container.

19. Device according to claim 1, characterized by the fact that it comprises a rotatable cylindrical net disposed above the flow channels for the foam and serving as a support for the lower surface of the product to be dyed which is not exposed to the foam.

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