CZ351899A3 - Process of continuous dyeing warp yarn and apparatus for making the same - Google Patents

Abstract

In the method, the warp yarn is airtight closed dyeing reactor (1) so that the warp yarn is impregnated according to the invention initial immersion in a fresh dyeing bath, followed by squeezes the inserted wringer (3a) placed in the dye reactor (1), and then occurs with the exclusion of oxygen on the other guide and return rollers (5a to 5g) without repetition immersing in a fresh bath fixation delay, which is variable adapts to the technological demands placed on dyes used. A dyeing reactor (1) is formed a sealed container at the lower end thereof dyeing tanks (2a to 2c) forming the bottom of the dyeing reactor (1), wherein the coloring tanks (2a, 2c) extending over the side walls, they also form a buffer shaft with guide and return rollers (4a, 4b, 4c) and form a sealed inlet and outlet relative to the surroundings for warp yarns. They are located in the dyeing reactor (1) inserted wringer (3a), whose squeezing pressure is variable adjustable to zero, and other guide and return a cylinder (5a to 5g) and under the dyeing reactor (1) is located a hydraulic tubular system for supplying the dyeing reactor (1) dyeing bath.

Description

Method of continuous dyeing of warp yarn and apparatus for its implementation

Technical field

The invention relates to a method for continuously dyeing warp yarns, in particular cotton warp yarns by indigo or other groups of dyes, which, after impregnation and squeezing, require oxidation or heat treatment after the impregnation and squeezing and fixation and a device for carrying it out.

BACKGROUND OF THE INVENTION

Continuous machines for dyeing warp yarn for dyeing indigo for blue action are known, which consist of connected dyeing containers with a spinner standing together or a dyeing flar with a relatively large bath volume. These dyeing fullar or flaring dye are also used for dyeing with sulfur or vat dyes for black and color processes. In order to solve the problems of color circulation and to achieve a better dye yield, it is known to integrate in the warp yarn dyeing machine additional units consisting of a dyeing flar with an economical trough and a subsequent evaporator. Thus, the units cannot be used for the main production of indigo dyeing.

Known dye containers with a spinner or dye foul consist of a simple roller vat in which the dyed warp is impregnated by guiding and turning over a plurality of rollers and / or impellers which are placed in the bath and then squeezed. The warp path in the bath and thus the dwell time in the color bath is determined by the number of baths equipped with rollers and impellers.

and their mutual distance. Because is speed curriculum at coloring indigem determined in advance and practically does not change, are here time immersion

• · • ·

And the volume of the bath is constant and thus only depends on the design of the dyeing container.

Due to the increasing demand for indigo blue denim with different color fastnesses and different tint depths, greater flexibility is required for the induced dyeing of light blue to super blue parts for black and color denim.

Different for conventional color tones of color tinting depths, indigo coloring devices require the use of fewer coloring containers.

For example, in light For dark tones, multiple tanks in sequence must be used. In light tinting, six dyeing tanks with up to 2500 l dyeing bath are generally used. This means that conventional indigo dyeing devices have to be adapted to produce different tone depths. Depending on the desired color tone, more dye containers must be used, or removed and the dye bath pumped or drained. The unnecessary coloring bath, which may be several thousand liters, must be drained or stored in an intermediate storage facility at the time.

In the known Loopdye apparatus, only a dyeing bath is required, through which the warp thread is laid several times over one another, for dark indigo tones four or five times.

Color tones other than indigo are colored with other groups of dyes, usually sulfur or vat dyes. These and also conventional cotton dye groups, such as reactive and directive dyes, have different affinities for cotton, generally higher than indigo. In addition, the affinity is further influenced by the color temperature, which may be far apart for the different dye groups. Thus, for example, the affinity and yield of the indigo dye increase with decreasing temperature, while for other dye groups with increasing temperature they increase.

• · · · · · · · · · · · · · · · · ·

By cooling an indigo dye bath in existing dyeing machines, it would be possible to achieve higher affinity and dye yield, but this is economically disadvantageous due to the number of dye tanks and the large number of dye baths.

Another problem that arises with existing dyeing machines is that the dye is extracted from the dye bath by affinity. This results in the beginning of the warp yarn being darker in color than the end of the warp yarn. This dreaded phenomenon, which can be seen in several thousand meters of dyed warp, occurs especially in larger plants with a large volume of dyeing bath, which can lead to long paint run-off.

SUMMARY OF THE INVENTION

It is therefore an object of the present invention to overcome the disadvantages of existing methods of continuous dyeing of warp yarns, in particular cotton warp yarns by indigo or other groups of dyes, which require oxidation or heat treatment for fixation and squeezing. In particular, the bath quantities required must be decisively reduced, and economically favorable conditions for cooling or heating the dyeing bath must be possible. The warp yarn dwell in the dyeing device should also be variable by simple construction means and the fixing temperature should be selectable from a temperature below ambient temperature to above 100 [deg.] C.

SUMMARY OF THE INVENTION It is an object of the invention to provide a method for continuously dyeing warp yarns, in particular cotton warp yarns by indigo or other dye groups, which allows high variability in dyeing warp yarns with different color tones but also different dye groups. sulfur or vat dyes under optimal conditions.

According to the invention, this object is solved by providing the warp.

The 4 warp yarns are passed through an airtight, closed dyeing reactor, which can be adapted to technological conditions optimal for some dyes. To do this, the warp yarn is soaked after initial immersion in a fresh dye bath and subsequently squeezed in an intermediate squeezer located in the reactor. The guide and return rollers then undergo fixation with the exclusion of oxygen, with or without any repeated immersion in the fresh dyeing bath, whereby the warp thread dwell can be adjusted in accordance with the desired color tone and the dye technology requirements.

The reactor of the invention is a top-sealed vessel having, at its lower end, openings for the warp yarn inlet and outlet. Below the dyeing reactor are placed tanks for the dyeing bath, into which the bottom opening of the reactor enters. These tanks also form an alignment shaft with guide and return rollers, which seal the dyeing reactor with respect to the surroundings and through which the warp yarn warp is fed and discharged. In addition, another squeezer may be placed in the inlet tub to squeeze the air still contained in the incoming warp yarn warp. These tanks are provided with twin bottoms through which an indigo dye bath can be cooled, but other dye baths, such as sulfur dyes, can be heated. In the dyeing reactor there is an intermediate squeezer whose squeezing pressure can be varied up to zero. Pairs of rollers may be inserted in place of, or in addition to, the wringer, which wipes excess dye on the wringer and thereby prevents the dye bath from dripping. The roller pairs are adjustable and positioned such that the warp yarn warp must form a more or less embossed S-curve or Z-curve. The guide or return rollers located inside the dyeing reactor, which are vertically displaceable in the interior, may shorten or extend the warp yarn warp time, depending on the technological requirements.

• • •

- 5 ··

Below the dyeing reactor is a hydraulic tubing system for supplying the reactor with a dyeing bath. This circulating system consisting of supply pipes, with pumps therein and also several valves, serves to circulate the impregnating or dyeing bath and, if necessary, to dispense more concentrated addition.

BRIEF DESCRIPTION OF THE DRAWINGS

Additional tasks, features, details and benefits *

according to the invention and also the device according to the invention for carrying out it are apparent from the following description of exemplary embodiments by means of the attached drawings. The drawings show:

giant . 1 coloring reactor v lateral perspective in section, giant. 2 coloring warp reactor threads, according to giant. 1 with shortened instructions giant . 3 dyeing reactor the amount of bath and according to giant . 1 when staining smaller giant . 4 coloring reactor according to giant . 1 when staining bigger

the amount of bath.

DETAILED DESCRIPTION OF THE INVENTION

The dyeing reactor 1 shown in FIG. 1 is formed by a top-closed vessel. On its underside it has three dyeing tanks 2a, 2b, 2c which are filled with a dyeing bath. The first dyeing tank 2a and the third dyeing tank 2c are at the same time equalizing shafts, i.e. the lower part of the side walls of the dyeing reactor 1 protrudes into the dyeing bath after the dyeing tanks 2a, 2c have been filled, thereby preventing ambient air, especially air oxygen, from entering. • ·

- 6 dyeing reactor 7. In addition, a further wringer 3c may be disposed in the first dye tank 2a, which expels the air still contained in the incoming warp yarn warp. In addition, the dyeing tanks 2a and 2b comprise double bottoms 7a, 7b, by means of which the dyeing baths are cooled or heated by the indigo, for example with a sulfur dye.

In the dyeing reactor 1 there is an intermediate wringer 3a. which can squeeze the warp thread so that the warp thread does not contain any drops of bath during the next run. By means of this intermediate wringer 3a, the squeezing pressure on the warp yarn warp can be varied to an unpressurized state by means of adjustable pressure rollers.

Instead of, or in addition to, the inserted wringer 3a, pairs A 1, k 2 of rollers can be used which wipe off the excess dyeing bath in the wringer 3a, 3c and thereby prevent the dyeing bath from dripping. The pulley pairs Ai, Up are adjustable and positioned so that the warp yarn warp must form more or less pronounced S-curves or Z-curves.

In the dyeing reactor X, immediately above the tanks 2a and 2c there are guide and return rollers 4a, 4b, 4c. These rollers are in a bath of leveling shafts. Use others. The guide and return rolls 5a to 5g guide the warp yarn warp through the dyeing reactor. These guide and return rollers 5a to 5g are provided with grooves 11. The grooves 11 of these guide and return rollers 5a to 5g prevent a possible cross-over of the yarns. Further guide and return rolls 5a to 5g remain free of fibers and dirt, thereby preventing yarn breakage. Furthermore, these guide and return rolls 5a to 5g are in the dyeing reactor. vertically adjustable, whereby the length of the warp thread can be varied. In the example of FIG. 1, the haul length K1 is 16 m.

the shortened haul K2 is 7 m.

The dyeing reactor housing 8 is heatable and is heatable and is heat-sealable. · · · ··· ··· ··· · · · · · · · · · · · · · · · · ·

- Ί created obliquely descending to prevent dripping. Furthermore, the dyeing reactor can be heated by means of a steam steam pipe 9.

In the case of steam heating, for example in sulfur dyes, the excess steam is discharged through the chimney 10. The chimney 10 is pressurized, i.e. opens at a predetermined vapor pressure.

Figures 3 and 4 show a hydraulic tubing system and the filling of the dyeing reactor 7 with a dye bath.

The coloring bath is supplied by means of the first overflow 11a. The uniformity of the feed bath having a higher concentration than the impregnating bath is ensured by flowing uniformly into the first dye tank 2a over the width of the dyeing reactor 7. The volume of the dye bath in this first dye tank 2a is, for example, 150 l.

The outflow of the dye bath may occur arbitrarily through the first overflow 11a or the third overflow 11c, depending on which dyeing tank 2a, 2b, 2c contains a dyeing bath. Also here the uniformity of runoff after. the entire width of the dyeing reactor 1;

The overflow of the centrifuged and reactive dye baths from the main spinner 34, which is located outside the dyeing reactor A, is effected by means of an outlet 11d.

The circulation of the impregnation or dye bath, which is very important for uniform dyeing, is ensured in the case of a small bath volume of 150 l by means of branches 12a and 12b of the circulation duct system with circulation pump 14 having a variable pumping capacity between 600 and 6000 l / h. .

In case of impregnation in both dye tanks 2a and 2b, • ·

9

A 9 9

A 9 9 • ····· · · 9 A A 999 999 • 99 999 «· • 9 A 9 9 9 9 9 · 9 99

8, with the volume of the dye bath in the first dye tank 2a 150 1 and 80 l in the second dye tank 2b, the bath circulation through branches 12a and 12c of the second circulation duct system also takes place by means of a circulation pump 14.

The selection of small and large dye bath circuits is controlled by valves 13a, 13b and 13c. The sixth valve 13f on the outlet pipe prevents bath concentration when a more empty tank is selected.

The commonly required concentration of the dyeing bath with the required amount of dyes and chemicals to be carried away by the outgoing warp yarn is by dispensing a more concentrated addition through the inlet 16 with a metering pump 17 which can be controlled by the fifth valve 13e. This addition of the addition to the two dye baths present in the circuit, the circulation bath and the squeezed and idle baths from the main wringer 3b, takes place by means of a mixing tank 15 with a bath volume of 30 l.

As a result, the total volume of the dyeing bath participating in the dyeing is in the preferred example using only the first dye tank 2a.

150 + 60 + 30 = 240 1

When both of the two ink tanks 2a and 2b are filled, the total volume is

150 + 80 + 60 + 30 = 320

Of course, other total volumes of the dye bath used are also possible. For example, there may be a reduction by using displacement bodies in the dyeing tanks 2a to 2c, possibly increasing by raising the inlets and outlets and increasing the bath level.

· · Φ · · · · · · · ·

In the following, two preferred dyeing methods are described in more detail by way of examples:

Example 1

In standard-navy-blue indigo dyeing, a total volume of 320 L is used. An indigo bath with 3 g / l indigo and the required amount of sodium hydrosulfite as the reducing agent is added.

After the dyeing tanks 2a to 2b and the third dyeing tank 2c have been filled at the main wringer 3b, the third dyeing tank 2c with a 1: 1 dilution, the dyeing bath is circulated by means of the third and first branches 12c, 12a of the circulation system and circulation pump 44.

The valve positions are as follows: valves 13a, 13c,

13d and 13e are open and the second valve 13b is closed.

Dyeing speed can be due to warp retraction (16 m)

up to 50 m / min and is set accordingly. Impregnation bath Yippee in this example chladzena preferably at 15 ⁰ C, thereby se substantially increase the affinity of indigo to cotton yarn. Addition with it avoids changes temperature,

conditional environment during the dyeing reaction.

. The feed additive of 80 g / l indigo with the required chemicals is proportional to the weight of the warp yarn used. The dosing control is taken over by the PC, which measures the input yarn length of the warp thread, recalculates the weight per unit of time (e.g. 18 kg / min) and then proportionally dispenses the feed allowance. In this example, dosing is provided for 2% dyeing at a feed additive concentration of 80 g / l indigo.

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4.5 l / min of feed additive.

With a haul length longer than 16 m, the highest possible dye yield and color fastness to washing will be highest.

When selecting a lower haul, the color fastness to washing is less, which may be quite desirable with a STONE washing machine.

Example 2

In principle, the dyeing with a sulfur dye for black-denim or color-denim follows the same procedure as described in Example 1, except that only the first dye tank 2a is used and thus the volume is reduced to 150 + 60 + 30 = 240 1.

Next, the dyeing bath is heated to at least 90 ° C and the interior of the dyeing reactor 1 is heated to 100 ° C to 102 ° C by steam.

The warp thread retraction is preferably 16 m, as a longer dwell ensures better dye yield.

PETR KALENSKY ATTORNEY AT LAW „SP ^ LFČMÁ ATTORNEY'S LAW OFFICE ALL GREAT ZELCHY

AND PARTNERS

120 00 Prague 2, Czech Republic. Hálkova 2 Czech Republic

Claims (21)

PATENT CLAIMS Method for continuously dyeing a warp yarn, in particular cotton warp yarn, with indigo or other groups of dyes, in particular sulfur dyes or vat dyes, in which a parallel guided warp of unlinked warp yarn is impregnated by passing a dye tank (2a to 2c) filled one or more dyeing baths, through a roller tray or dye foul, as well as to extend the dwell time across the multiple rollers and / or deflection rollers (4a to 4c) that are located in the dyeing bath, then squeezed, flushed with a wringer (3b) , is wound and wound onto a warp roller, characterized in that the warp yarn warp is guided through an airtight sealed dyeing reactor (1), adaptable to optimum technological conditions, so that the warp yarn warp is impregnated into the fresh dyeing bath as initially immersed. squeezes the inserted squeezer (3a), um the dyeing reactor (1), and then, with the exclusion of oxygen on the other guide and return cylinders (5a to 5g) without repeated immersion in the fresh bath fixation dwell, the warp thread dwell in the dyeing reactor (1) being variably adjusted according to the desired color tone to technological requirements placed on the group of dyes used. Method according to claim 1, characterized in that the warp yarn warp is immersed in less than 300 l of an indigo dyeing bath at a concentration of 3 g / l after squeezing into the dyeing reactor t (1) after squeezing in the intermediate spinner (3a). the warp yarn concentration is halved, so that in the following delay the warp yarn warp can stretch an existing high concentration of 3 g / l onto the cotton yarns in the dyeing reactor (1). A method according to claim 1, characterized in that the cooling is 9 9 9 9 · ··· 999 · 9 9 9 9 9 99 ·> ··· ·· ·· - 12 dye baths and warp dwell time in the dye reactor (1) for indigo dyes are adjusted so that the maximum dye yield is achieved and the number of dyeing tanks (2a to 2c) and the number of dip oxidation runs are minimized. Method according to claim 1, characterized in that, in order to save the dye, the concentration of the bath in the outlet dyeing tank (2c) is so small that, after squeezing on the warp, there is little unfixed dye to be washed in the subsequent washing bath. Method according to claim 1, characterized in that an inert gas, for example nitrogen, is introduced into the hermetically closed dyeing reactor (1) to prevent oxidation of the dye. The method according to claim 1, characterized in that the air present in the warp yarn inlet is forced by means of another scrubber (3c) located below the bath at the inlet of the dye reactor (1c) to prevent oxidation of the dye in the hermetically closed dyeing reactor (1). ). Method according to claim 1, characterized in that the indigo dye baths placed in the dyeing tanks (2a to 2c) are cooled to increase the affinity. Method according to claim 1, characterized in that the sulfur dyes or vat dyes placed in the dyeing tanks (2a to 2c) are heated and the interior of the dyeing reactor (1) is heated by means of steam. ’ Method according to claim 1, characterized in that the spinning of the warp threads of the yarn in the first spinner (3a) is variably adjusted to affect the coloration and color fastness during washing. 10. The method of claim 1 wherein said dyeing - 13 • ·· ·· ·· ·· · · · " · · • · · · · · · • · · * ··· ··· • · · · · • · · · · · · · · 11. a bath whose concentration lies above the concentration of the impregnating bath is fed to the dyeing reactor (1) evenly through the first overflow (11a) and the dyeing bath is discharged via the second overflow (11b) or through the third overflow (11c) according to the dyeing tank (2a, 2b) ), which comprises a soaking bath, and the squeezed and idle dyeing bath is removed by means of a main squeezer (3b) located outside the dyeing reactor (1) and an outlet (11d). Method according to claims 1 and 10, characterized in that the circulation of the impregnating or dyeing bath is carried out by means of a circulation system with a circulation pump (14), the bath volume being determined by means of valves (13a, 13b, 13c) and The wringers (3b) are performed by a pipe system (12d) with an adjustable valve (13d). 12. The method according to the claim normally dye quantities are removed by the amount required and dyeing more concentrated by the metering pump (13e). 1, 1.0 and 11, characterized in that the concentration of the dyeing bath by the desired chemical, which is obtained from the dyeing bath of the warp yarn, is provided by dosing the addition by means of an inlet (16) with (17) which is controlled by a valve 13 . Device for carrying out the method according to claims 1 to 12, characterized in that the dyeing reactor (1) is formed by a closed vessel, at the lower end of which there are dyeing tanks (2a to 2c) forming the bottom of the dyeing reactor (1), (2a, 2c) protruding over the side walls at the same time form an alignment shaft with the guide and return rollers (4a, 4b, 4c) and form a sealed inlet and outlet for warp yarn warp, with the dyeing reactor (1) being an intermediate squeezer (3a) is provided, the squeezing pressure of which is variable to zero - 14 ΦΦ ΦΦ ΦΦ φ φ ΦΦΦ · φφφφ ΦΦ · ΦΦ ΦΦ ΦΦ • • · · · · · · · · · · · · · · · · · · · · · · ·,, ·, ·,, · ·,, ·,,,,,,, ·,, a tubular system for supplying the dyeing reactor (1) with a dye bath. A guiding and shortening device vertically according to claim 13, a warp roller (5a) of warp sliding. characterized in that further up to 5g) are for elongation or yarn in the dyeing reactor (1) Apparatus according to claim 13, characterized in that the further guide and return rollers (5a to 5g) are provided with a groove. Apparatus according to claim 13, characterized in that adjustable pairs (Al, A2) of pulleys, preferably made of teflon rods, are disposed in the dyeing reactor (1) to wipe off the excess dyeing bath. Apparatus according to claim 13, characterized in that the double bottoms (7a, 7b) of the coloring tank (2a, 2b) are heatable and cooled. Apparatus according to claim 13, characterized in that the top cover (8) of the dyeing reactor (1) is obliquely descending and heatable, wherein the dyeing reactor (1) is provided with a steam conduit (9) for heating the interior space of the dyeing reactor (1). 1). Apparatus according to claim 13, characterized in that the dyeing reactor (1) is provided with an overpressure control stack (10). Device according to claim 13, characterized in that the hydraulic pipe system consists of supply pipe branches (12a to 12d) with a circulation pump (14) located there and valves (13a to 13d) for charging the dyeing reactor (1) and for circulating the feed. and dye baths, respectively The dosing pump (17) in the inlet (16) with the valve (13e) for dosing the more concentrated addition. Apparatus according to claim 13, characterized in that horizontal inlets (11a to 11c) are arranged in the inlets and outlets to ensure uniformity of the dyeing bath over the width of the dyeing reactor (1).