EP1046738B1 - Method and device for continuously washing a textile fabric - Google Patents

Abstract

Continuous textile fabrics (1) are scoured by passing them upwards through a vertical shaft (6) without contacting the sides the top (7) the shaft is fed across the full width with wash liquor (10) by an overflow system. The liquid (10) is retained at a level at the bottom (8) where it is drawn off so that the shaft remains completely filled. An Independent claim is also included for equipment for carrying out this process, with an overflow liquid feed at the top shaft and a vessel that is kept filled at the bottom. Several shafts can be used in series, with an appropriate change in level provide flow by gravity. The gap between the sides of the shaft (6) is adjustable below 15 mm, e.g. optimal results were obtaine with 6 mm. The equipment can form the pre-wash stages of conventional plant.

Description

The invention relates to a method and an apparatus for the continuous washing of a textile web according to the preamble of claim 1, and a washing device according to the preamble of claim 10.

Such methods and apparatus for a continuous washing process are in the Textile finishing has long been known and used. They serve to put on the textile web Substances from upstream refining processes such as e.g. Sage, lye, colorants etc. wash out. The aim is to achieve the highest possible washing efficiency, To the expenditure on equipment and the consumption of fresh water or wash liquor so low as possible.

In particular, numerous methods and devices have become known in which the textile web passed through a vertical and more or less closely formed shaft and there treated with wash liquor. An example of this is the EP A 43 083, according to which at the upper end of the shaft on both sides of the web washing nozzles are arranged. Of the Channel itself is formed in a zigzag cross section, the web over leading edges the channel is guided. However, the web becomes a heavy mechanical load exposed and non-detachable dirt particles are pressed into the web.

By EP A 433 228 (preamble of claims 1 and 10) a generic comparable method has become known at the textile web through a nozzle compartment with an ascending and a descending Shaft is guided. The web is under pressure at the upper end of each of the shafts Nozzle arrangement with wash liquor and / or acted upon by steam. This can basically very good results are achieved. However, not all textile fabrics are equally suitable good for such an intense pressurization. In addition, that requires Nozzle system a little increased maintenance.

It is therefore an object of the invention to provide a method of the type mentioned, in which the textile web with a high washing efficiency and low energy consumption treated as gently as possible. Both the expenditure on equipment, as well as the consumption Washing liquor should be kept as small as possible. This task will solved according to the invention with a method having the features in claim 1. It has It was shown that with a goods passage in the shaft from bottom to top always better Washing results are achieved, as in the opposite case.

The inventive passage of the wash liquor ensures that the shaft is always up to Flooded upper end, wherein in the shaft due to the countercurrent principle, a turbulent Flow stops. The wash liquor flows without pressure into the shaft, and evenly on both sides of the web.

Particularly advantageous is the web after leaving the first shaft to the same Way guided by at least one second shaft, at which the wash liquor at the top is fed in the same way from a second overflow system in the shaft. The Level of the wash liquor in the second overflow system is above the level in the first overflow system and the wash liquor becomes the first overflow system at the lower end of the second shaft fed below its level. In this arrangement, the manholes form a waterfall-like Cascade system.

In intense currents, the shafts are filled with liquid and dirt particles are detached from the surface and carried away. Of course, it would be conceivable, more than two Manholes arranged in the same way one behind the other.

Preferably, the web is at least after leaving the first shaft via a Draining run out, which has at least the same length as the length of Shaft. Thus, the degree of loading of the web can be greatly reduced with wash liquor. In addition, the web can at least after leaving the first and the second shaft for stripping the wash liquor, a pair of rolls wrap around in opposite directions. To achieve a Controlled goods tension, this pair of rollers can be provided with a drive. instead a pair of rollers could also be provided only a simple guide roller.

To achieve an additional washing effect, the web outside the shaft at least be acted upon on one side of a nozzle assembly with wash liquor. In order to it can be ensured that no larger impurities adhere to the web, if this occurs in the subsequent treatment step.

Preferably, the web is fed to the first shaft via a moat whose liquid level above the lower end of the first shaft. This ensures, on the one hand, that the first shaft always remains completely filled with liquid. on the other hand Vapors and gases can be retained at the moated castle.

The web can after leaving the first shaft or at several shafts after the Leaving the last shaft are passed through a squeezing. In such a Quetschwerk the degree of loading of the web can be controlled relatively precisely with wash liquor.

A particularly advantageous combination results when the web after leaving the first shaft or several shafts after leaving the last shaft one Diving compartment is supplied, in which it passes through upper guide rollers and lower dipping rollers several filled with wash liquor chambers is performed. The first and g.g.f. the others Overflow systems can with the guided in countercurrent through the immersion compartment wash liquor be fed. The shafts are evidently a Vorwaschabteil, which the total distance to be covered by the track in the diving compartment can be greatly reduced. The purity of the wash liquor is increased both in the pre-wash compartment and in the dipping compartment always on the feed direction of the web. Instead of the dipping compartment, the prewash compartment could Of course, also be combined with other washing compartments, which the Train by other principles. Conceivable, for example, would be the use a drum washing machine.

In terms of the device, the object is achieved by a device with the Characteristics solved in claim 10. The shaft or the offset arranged one behind the other Manholes form an air-free hydraulic system with continuous flow on both Sides of the railway.

Particularly good results can be achieved if the inside width of the shaft or the Shafts, ie the free distance between the two shaft walls, in a range of less designed as adjustable 15 mm .. This is the one hand, the collection of the material web much easier by the shaft, if necessary, also open to a greater distance can be. On the other hand, the shaft width can be exactly the one to be treated Adjust material web. Preferably, one shaft wall is fixed and the opposite one Shaft wall arranged adjustable. As adjustment can set screws, eccentric joints or the like can be used. For example, in one experimental setup Achieved optimum results with 6 mm.

Be advantageous for the required deflections of the web or for the non-contact Guiding the web in the shafts exclusively steel rollers used For fleet separation However, other systems such as e.g. Crushing machines, vacuum suction devices, stripping devices etc. are used.

Figur 1

einen Querschnitt durch eine erfindungsgemässe Vorrichtung in stark vereinfachter Darstellung,

Figur 2

die Vorrichtung gemäss Figur 1 in Kombination mit einem konventionellen Tauchabteil,

Figur 3

eine vergrösserte Darstellung eines einzelnen Schachtes und

Figur 4

eine Querschnitt durch eine erfindungsgemässe Vorrichtung mit nur einem Schacht.

Further advantages and individual features of the invention will become apparent from the following description of an embodiment and from the drawings. Show it:

FIG. 1

a cross section through an inventive device in a greatly simplified representation,

FIG. 2

the apparatus according to FIG. 1 in combination with a conventional immersion compartment,

FIG. 3

an enlarged view of a single shaft and

FIG. 4

a cross section through an inventive device with only one slot.

According to FIG. 1, a prewash compartment, designated overall by 16, has a closed housing 17, in which a textile web 1 are introduced in the direction of arrow a via a moat 15 can. At an entry roller pair 18, the web is thereby in the correct insertion position brought.

Inside the enclosure and immediately following the water lock are stepped a first shaft 2 and a second shaft 6 are arranged offset. The shaft walls are plane-parallel formed to each other and enclose the web 1 relatively tight. At the top 3 of the first shaft or at the upper end 7 of the second shaft is ever a first overflow system 5 or a second overflow system 9 is arranged.

The first overflow system 5 consists of a relatively shallow overflow trough 19 on the one Side of the shaft and a larger overflow trough 20 on the other side of the shaft. The overflow trough 20 is designed as a dip trough, in which a dipping roller 29 is arranged is.

In the same way, the second overflow system 9 consists of a flat overflow trough 21st and a larger overflow trough 22. While the flat overflow trough 21 is approximately the same is like the overflow trough 19 of the first overflow system, the larger trough 22 narrower than the overflow trough 20 because it does not have to absorb a dipping roller.

The two overflow systems each have a liquid level N1 and N2. The lower end 8 of second shaft is below the level N1 of the first overflow system 5 and below the upper End 3 of the first shaft 2. In the same way is the lower end 4 of the first Well 2 below the liquid level NA of the moated castle 15th

The entire liquid system of the wash liquor 10 is in the direction of arrow b via a liquor supply line 23 fed. This leads directly to the moated castle 15 and supplies this with Liquid. At the same time, however, a washing liquor from the liquor supply line is also pumped 23 taken and via a pressure line 26 and a valve 27 a nozzle assembly 36 supplied. This is arranged over the second overflow system 9 and serves to the web In the region of the second pair of rollers 13 to spray under pressure to improve the washing effect. The wash liquor flowing along the web in this way feeds the two overflow systems. The overflow pans on both sides of the web are each over a pipe connected to each other, so that according to the principle of communicating tubes in both Tubs always sets the same level. The discharge of the wash liquor takes place at the deepest Place, so at the moated castle 15 via a gutter 24. The maintenance of a sufficient Of course, flow is also possible in other ways. For example the wash liquor are also fed directly to the second overflow system 9.

The textile web 1 is stretched wide through the entire device and out in the area the two shafts held so that they passed the shafts contactless. To this end are roller pairs 12 and 13 arranged over the two shafts, which at the same time serve to strip away entrained wash liquor. For this purpose, the pairs of rollers are in opposite directions entwined. Of course, it would also be conceivable, above the shafts only to arrange individual rollers. In the first shaft 2, the web between a fountain roller 28th and the first pair of rollers 12 out. The pair of rollers 12 is arranged so that a free Abtropfstrecke 11 remains, the length of at least the same size, but preferably larger is as the length of the shaft.

In the second shaft 6, the web between der.Tauchwalze 29 and the second pair of rollers 13 led. Another nozzle assembly 14 could also be on the other side of the web Be provided area of the upper roller.

The exit of the textile web from the prewash compartment 16 takes place at a housing opening 36. As shown in Figure 2, the prewash compartment is designed to work directly with another unit to be coupled. In a freestanding prewash compartment, the textile web could also be passed through a water lock at the exit to seal the steam atmosphere inside. In such a case, but would also be the arrangement of a squeezing at the output particularly advantageous to control the degree of loading of the web with wash liquor can.

FIG. 2 shows the prewash compartment 16 according to FIG. 1 in direct structural connection with a conventional immersion compartment 30. In a known manner, the immersion compartment is the textile Web 1 via upper guide rollers 31 and lower dip rollers 32 each in double loops guided. The lower guide rollers are each arranged in individual chambers 33, which flowing through in countercurrent of wash liquor. At the upper guide rollers 31 can Squeezing rollers 34 may be provided.

The wash liquor from the dipping compartment 30 is connected via a connecting line 35 to the prewash compartment Supplied 16 and is thus already partially loaded with dirt or chemicals. However, this is completely sufficient for the intensive washing action desired in the pre-wash compartment 16.

FIG. 3 again illustrates the mode of action of the washing method according to the invention. By the inflow of wash liquor 10 on both sides of the textile web 1 in the shaft 6 and by the countercurrent principle, a turbulent indicated by the arrows forms Flow, which leads to a rapid penetration of the textile web. About the individual Liquid levels are at atmospheric pressure and the flow rate becomes unique determined by the amount of the supplied wash liquor. The length of a single shaft and its clear width depend on the individual case. However, the minimum length is preferably about 250 mm

Figure 4 shows a device which operates on substantially the same principle as that according to Figure 1, but which has only a single shaft. The supply of the material web 1 takes place in the direction of arrow a via a simple entry roller 40, which the web directly to the moated castle 15 diverts. In the shaft 2, the web between the fountain roller 28 and the Roller pair 12 out. The overflow system 5 here consists of a large overflow trough 37 and a small overflow trough 38. The latter is directly in the movable shaft wall 41st integrated. This shaft wall can be pivoted away in the direction of arrow c at an eccentric joint 39 become.

The supply of the wash liquor via the liquor supply line 23 directly into the large overflow pan 37. About a not shown lateral connection line is the connection to small overflow trough 38 guaranteed. Through the shaft 2, the wash liquor flows directly into Water lock 15 and from there into the gutter 24th

Claims (17)

1. Method for continuous washing of a run of textile fabric (1), wherein the run of fabric is guided in a contactless and stretched manner from the bottom upwards through at least one first, approximately vertical shaft (2), and wherein washing liquor (10) is supplied at the upper end (3) of the shaft and is led off at the lower end (4) of the shaft,
   characterised in that

   the washing liquor is fed out of a first overflow system (5) into the shaft at the upper end (3) of the shaft (2) on both sides of the fabric run, and over its entire width,

   and that the washing liquor is led off at the lower end (4) of the shaft (2) in such a way below a liquor level (NA)

   that the shaft is completely filled with washing liquor.
2. Method in accordance with claim 1, characterised in that

   after leaving the first shaft, the fabric run is led in the same way through at least one second shaft (6), at which the washing liquor is supplied into the shaft (6), at the upper end (7), in the same way out of a second overflow system (9),

   the level (N2) of the washing liquor in the second overflow system (9) lies above the level (N1) in the first overflow system (5),

   and that the washing liquor at the lower end (8) of the second shaft (6) is supplied to the first overflow system (5), below its level (N1).
3. Method in accordance with claim 1 or 2, characterised in that the fabric run (1), at least after leaving the first shaft (2), is led over a dripping section (11) which is at least the same length as the shaft.
4. Method in accordance with one of the claims 1 to 3, characterised in that the fabric run, at least after leaving the first shaft, winds around a roller pair (12, 13) in an opposite direction, to wipe off the washing liquor.
5. Method in accordance with one of the claims 1 to 4, characterised in that the fabric run (1) outside the shaft is pressurised, at least on one side, with washing liquor from a jet arrangement (14).
6. Method in accordance with one of the claims 1 to 5, characterised in that the fabric run is supplied to the first shaft (2) via a water lock (15), whose fluid level (NA) lies above the lower end (4) of the first shaft (2).
7. Method in accordance with one of the claims 1 to 6, characterised in that after leaving the first shaft (2), or after leaving the last shaft in the case of several shafts, the fabric run is led through a squeezing apparatus.
8. Method in accordance with one of the claims 1 to 7, characterised in that after leaving the first shaft (2), or after leaving the last shaft in the case of several shafts, the fabric run (1) is led to an immersion compartment (30) in which it is guided via upper deflection rollers (31) and lower immersion rollers (32), through preferably several chambers (33) filled with washing liquor.
9. Method in accordance with claim 8, characterised in that the first and - if applicable - further overflow systems are supplied with the washing liquor out of the immersion compartment (30), this [liquor] being guided though the chambers (33) in counter-current.
10. Arrangement for the continuous washing of a run of textile (1) with at least one first, approximately vertical, shaft (2), through which the fabric run (1) can be guided in a contactless and stretched manner, from the bottom upwards, and with elements for supplying washing liquor at the upper end (3) of the shaft,
    characterised in that

    the elements are designed as a first overflow system (5), each with an overflow trough (19, 20) which extends over the entire width and which is arranged on each side of the fabric run,

    and that the lower end (4) of the shaft (2) opens into a container in such a way

    that it is inundated with washing liquor.
11. Arrangement in accordance with claim 10, characterised in that

    in relation to the direction of transportation (a) of the fabric run, arranged after the first shaft (2) is at least one second shaft (6) of the same kind, arranged at the upper end (3) of which is a second overflow system (9) of the same kind,

    wherein the second shaft (6) is arranged offset relative to the first shaft (2) so that its upper end (7) lies above the upper end (3) of the first shaft (2), and its lower end (8) lies below the upper end (3) of the first shaft.
12. Arrangement in accordance with claim 10 or 11, characterised in that the clear width of the shaft or shafts is preferably adjustable in a range of less than 15 mm.
13. Arrangement in accordance with one of the claims 10 to 12, characterised in that at least above the first shaft, a roller pair (12, 13) is arranged, around which the fabric run can be wound, in an opposite direction.
14. Arrangement in accordance with one of the claims 10 to 13, characterised in that arranged in the advance feed area of the fabric run, outside the shaft or shafts, at least on one side is a jet arrangement (14) for subjecting the fabric run to washing liquor.
15. Arrangement in accordance with one of the claims 10 to 14, characterised in that the shaft or shafts (2, 6) are surrounded by a housing (17) and that the fabric run (1) can be introduced into the first shaft via a water lock (15) arranged at the lower end (4) of the first shaft (2).
16. Arrangement in accordance with one of the claims 10 to 15, characterised in that the shaft or shafts (2, 6) form a pre-wash compartment (16) which is arranged before an immersion compartment (30) in which upper deflection rollers (31) and lower immersion rollers (32) are arranged, wherein the immersion rollers are surrounded by chambers (33) for accommodating washing liquor.
17. Arrangement in accordance with claim 16, characterised in that the washing liquor that is guided in counter-current through the chambers (33) of the immersion rollers can be supplied via a connection conduit (35) to the overflow system or overflow systems (5, 9).

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