WO2008145094A1

WO2008145094A1 - Method and plant for the textile treatment of tubular fabric

Info

Publication number: WO2008145094A1
Application number: PCT/DE2008/000858
Authority: WO
Inventors: Oliver Hostenkamp
Original assignee: Lindauer Dornier Gesellschaft Mbh
Priority date: 2007-05-26
Filing date: 2008-05-21
Publication date: 2008-12-04
Also published as: DE102007024786A1

Abstract

A description is given of a method and plant for the textile treatment of tubular fabric, which is operated with a first part-treatment by means of a first active liquid and with a second part-treatment with a second active liquid, as a continuous, total process. The tubular fabric in the form of a continuous tube (1) undergoes the first part-treatment in a pretreatment station (26) and then, on leaving this pretreatment station (26), passes continuously into an aftertreatment station (27). In the aftertreatment station (27) the second part-treatment takes place. At the end of the first part-treatment, the concentration of the active agent in the first active liquid carried by the tubular fabric is set deliberately to the level that is needed at the beginning of the subsequent, second part-treatment.

Description

Process and plant for textile finishing of textile tubular goods

The invention relates to a method for textile finishing of textile tubular fabric, which is subjected in the form of an endless tube successively a first partial treatment by a first active liquid and a second partial treatment by a second active liquid, according to the preamble of claim 1. The invention further relates to a Plant for textile finishing of textile tubular goods, which is intended and suitable for carrying out the method according to the invention, according to the preamble of claim 8.

An important process for textile finishing of tubular fabric, such as circular knit fabric, in two successive partial treatments, is mercerizing with subsequent bleaching. When Mercerizing the tubular fabric in the form of an endless tube with an alkaline solution, usually diluted

Caustic soda, treated as a working fluid. During the subsequent bleaching, the tube is treated with a bleaching liquid, primarily with peroxide.

According to the state of the art known from operational practice, the procedure in this case is that the mercerizing and bleaching of textile tubular goods take place in separate process sequences and installations. During the mercerization process, the endless tube is successively passed through various treatment stages by first impregnating it with the active liquid and then undergoing a reaction treatment by heating and applying a mechanical stress. Subsequently, the active liquid must be removed again from the endless tube and recovered, at least diluted, the final treatment stage is a washing out and cooling of the tube with washing water.

The mercerized endless tube is then stored temporarily and fed to another system in which the bleaching is carried out by known methods. This procedure is documented for example by DE 28 13 603 A1, which corresponds to the above-mentioned prior art according to the preambles of the claims 1 and 8. The processes for bleaching textile tubular goods can be assumed to be known. The mercerizing and bleaching of textile tubular fabric in separate processes and equipment is manufacturing technology and economically disadvantageous because conveyor and control devices distributed over two plants, so must be procured twice, the production is interrupted by intermediate storage and also an increased space requirement and a greater number of trained supervisors and operators is required. In addition, there is an increased need for active fluid and the risk of environmental pollution when the required for mercerizing active fluid is always completely recovered, processed and used again.

In the processing of textile flatware, however, it has long been known to combine the processes for mercerizing with subsequent bleaching into a single process, which takes place in a single plant, cf. For this purpose DE-U 1 813 515 and GB-PS 4251 from the year 1907. If such continuous running overall process in the textile finishing of tubular fabric have not been proposed so far, this is probably because that tubular fabric process is much more difficult to handle than flatware. Reference is made to the already mentioned DE 28 13 603 A1 (page 1, paragraph 2 to page 4, paragraph 1).

When transporting and treating the endless tube whose panels must be at least temporally and partially to each other. This complicates a uniform mass transfer when exposed to the different treatment liquids. At the same time, the deflection points of the fabric webs are particularly endangered when the walls of the endless hose lie in two layers on top of each other. This can lead to wrinkles and bow marks on the finished tubular fabric. Another critical point is the transition from mercerizing to bleaching, for example, when the alkaline solution is completely removed after mercerizing and treatment with peroxide is to be applied to a completely washed and neutralized web.

As a remedy has already been proposed according to DE 28 13 603 A1, expand the endless tubular web in individual treatment sections by an air flow, so that the fabric is present as a hose in a uniform state of tension with free accessibility of their entire surface to the environment and treated in this state can be. However, it is not possible to economically perform the entire process of mercerizing or bleaching in this state. Also, the expansion of the tubing does not mean a solution for a direct Transition from mercerizing to bleaching. The same limitations exist for the arrangement of mechanically acting Rundbreithaltern, as they are known for example from EP 0 503 269 A1.

However, a completely uniform sequence of the various phases of impregnation, reaction and dilution in the two partial treatments over the entire fabric is a prerequisite for a high-quality condition of the finished finished tubular fabric.

The invention is therefore an object of the invention to provide a method and a system of the initially mentioned type, with which a two-stage textile finishing of tubular fabric is performed in such a way that meets the requirements of economy, environmental protection and a space-saving design of the system as well are like the demand for a finished finished product of consistently high quality.

The solution of this object is achieved with regard to the method with the entirety of the features of claim 1 and with respect to the system with the totality of the features of claim 8.

Surprisingly, it has been found that in many cases it is not necessary or even desirable at the end of the first partial treatment to completely wash out the active agent in the active fluid entrained by the endless tube before the tube is supplied to the second partial treatment. A certain residual content of active fluid from the first partial treatment, which must, however, be set relatively accurately, may even be advantageous for starting the second partial treatment, can be accepted in any case. The means by which this residual content can be adjusted are available to the person skilled in the art. In this way, it is possible to combine the procedures and the facilities for the two partial treatments procedurally and structurally and thereby solve the task mentioned.

According to claim 1, the inventive method is performed with a first partial treatment by a first active liquid and a second partial treatment with a second active liquid as a continuous overall process in which the endless tube undergoes the first partial treatment in a pretreatment station and continuously leaving this pretreatment station in a Post-treatment station in which the second partial treatment takes place. At the end of the first partial treatment, the concentration of the active agent in the first active fluid entrained by the endless tube is set in a targeted manner to the value which is required at the beginning of the subsequent second partial treatment.

The following partial processes preferably take place successively in both treatment stations: impregnation of the endless tube with the active liquid, heating and reacting with the active liquid, dilution of the active liquid and cooling. During impregnation, the active agent is applied to the tubular fabric and the tubular fabric is wetted. It is important that the entire product is brought into contact with the active agent as quickly and evenly as possible in order to obtain a uniform, high-quality end product. To accelerate the impregnation, the active liquid can be admixed with an additional wetting agent. The impregnation sub-step steers steplessly into the sub-process React. The impregnation is completed as soon as the endless tube completely with the

Wetting liquid is wetted. The sub-process of reacting includes the period in which the active liquid is in direct communication with the product and can undergo a reaction. The reaction time needed to arrive at the desired result may be e.g. be influenced by heating. When mercerizing, for example, the reaction time can be set to 30 seconds.

The process of dilution and cooling at the end of the first partial treatment preferably takes place, at least in its last phase, by washing with water. The concentration of the active agent in the first active liquid is adjusted by controlling one or more of the following parameters: amount and temperature of the washing water and the duration of the washing process.

According to a preferred embodiment of the invention, the first partial process is a mercerizing with sodium hydroxide solution as the first active liquid and in the second partial process a bleaching with a bleaching liquid as the second

Effective liquid. At the end of the first partial treatment, the liquor concentration which is optimal for the subsequent bleaching is set in the liquor entrained by the endless tube.

The inventive method can be carried out, for example, such that the endless tube in the transition from the pretreatment station in the Aftertreatment station is passed through a surge tank and that a branch of the current in the expansion tank dilute sodium hydroxide solution is circulated through a device for density measurement, wherein according to the density measurement, the liquor concentration in the entrained by the endless hose fleet at the end of the first part treatment to the optimum Value is adjusted. A device suitable for this purpose is described, for example, in the patent application filed by the applicant, unpublished patent application DE 10 2007 012 443.2.

Further embodiments of the present invention relate to the lye concentration in the liquor entrained by the endless hose as it enters the

Post-treatment station, which is preferably 2 to 3 ° Baume, and a method in which the reaction of the bleaching liquid with the endless tube in the second partial treatment takes 10 to 15 minutes.

The present invention further comprises a plant for textile finishing of tubular fabric in the form of an endless tube with the features of claim 8. Thereafter, a corresponding system is equipped with a pretreatment station, in which the tube is treated with a first active liquid, and with a post-treatment station in which the tube is treated with a second active liquid, wherein the pre- and post-treatment station are assembled into a single system. The endless tube passes in a continuous conveying process from the pretreatment station in the post-treatment station, wherein in the region of the transition from the pretreatment station in the aftertreatment station, a device is arranged by the concentration of the active agent in the first active liquid carried by the endless tube to a Value is set, which is optimal as the starting value for the treatment in the aftertreatment station.

In each case, at least one impregnation section, at least one reaction section and at least one washing section are preferably arranged in the pre-treatment and post-treatment stations.

In the pretreatment station of the plant, mercerization is preferably carried out by means of sodium hydroxide solution and in the post-treatment station bleaching is carried out by means of a bleaching liquid, wherein in the region of the transition from the pretreatment station to the post-treatment station by the concentration adjustment device Concentration of the entrained by the endless hose sodium hydroxide solution is set to the optimum value.

In a preferred embodiment of the system according to the invention, a compensation tank is arranged between the pre-treatment station and the post-treatment station, which is filled with dilute sodium hydroxide solution and through which the endless hose is passed. The device for concentration adjustment in this case has a device for continuous density measurement, through which a partial flow of located in the expansion tank, dilute sodium hydroxide solution is circulated. About a control device is in accordance with the measured density value of the

Washing process in the washing section of the pretreatment station influenced such that the optimum concentration value of entrained by the endless tube sodium hydroxide solution is maintained. For this purpose, reference is again made to the previously mentioned, non-prepublished patent application with the file reference DE 10 2007 012 443.2, which describes a suitable device for controlling the density of a liquid mixture in a batch container. The surge tank of the present invention may correspond to the approach tank of said earlier application.

A further preferred embodiment of the system has at least one in the

Washing section of the pretreatment station for the inlet of washing water arranged and controlled by the control device regulating valve, by which the amount and / or the duration of action of the acting on the endless tube wash water is adjustable.

The washing sections in the pre-treatment and / or post-treatment station preferably have wash towers which are equipped with at least one round spacer for guiding the endless tube. Round spacers enable a gentle and uniform treatment of the textile tubular fabric over the entire circumference and thus a high-quality end product. Types of Rundbreithaltern are well known in the art and therefore will not be described separately here.

The invention with further details of a possible embodiment will be explained below with reference to the figures. In the accompanying drawings show

Figure 1 is a simplified representation of a textile finishing plant for

Implementation of the method according to the invention for textile finishing of textile tubular goods;

Figure 2 shows a section of the textile finishing plant for textile finishing with a device for controlling the concentration of the active agent in a schematically simplified representation and

FIG. 1 shows in simplified form a possible embodiment of a textile finishing plant for carrying out the method according to the invention. In essence, this plant consists of a pre-treatment station 26 and a post-treatment station 27.

At the beginning of the pretreatment station 26, the tubular fabric is presented in the form of the endless tube 1 in the carriage 2 and passed through a Entwirrkopf 3 through a impregnation 4 and a first reaction section 5. Thereafter, the endless tube 1 passes through a washing section, which consists for example of two washing towers 6 and 7, and passes through a first squeezing 8 after the washing section 6, 7 in a surge tank 9 in the transition region between pretreatment station 26 and aftertreatment station 27. Figure 1 shows the Front view of such a textile finishing plant, arranged in the second washing tower 7 just behind the first washing tower 6 and therefore is not visible in this illustration.

In the area of the transition from the pre-treatment station 26 into the aftertreatment station 27, the expansion tank 9 is arranged, in which the endless hose is passed through active fluid via a plurality of guide rollers. In this surge tank and the device is arranged by the concentration of the active agent is adjusted in the entrained by the endless tube 1 first active liquid to a value which is optimal as the starting value for the treatment in the aftertreatment station 27.

At the end of the expansion tank 9 is a second squeezing 13. By the second squeezing 13 reaches the endless tube in the aftertreatment station 27. Here, the hose is first by an impregnation 14 in the form of a Impregnated trough out which contains the bleaching liquor. When leaving the impregnation section 14, the endless tube 1 passes through a third squeezing device 15.

In the course of goods arranged downstream are a damper 16 and a conveyor belt 18, which are both located in a thermally insulated reaction chamber and parts of the reaction section 17 of the aftertreatment station 27 are. This is followed by a washing section consisting of two washing towers 19, 21 and a trough 20 arranged therebetween. Finally, the endless tube 1 is deposited at the end of the aftertreatment station 27 by a folding mechanism 22 in a carriage 23.

The tubular fabric to be treated in the form of the endless tube 1 is, for example, a circular knitted fabric consisting of pure cotton or cotton blended fabrics. The tubular fabric is provided in the carriage 2 and runs from there for pretreatment via a Entwirrkopf 3 in the impregnation and reaction section 4, 5 of the pretreatment station 26 a. In the impregnation section 4, the endless tube 1 is immersed in sodium hydroxide solution having a concentration of about 28-32 ° Baume. This achieves a quick and thorough impregnation of the entire tubular fabric. In the subsequently arranged reaction section 5, the endless tube 1 reacts with the sodium hydroxide solution for at least 30 seconds.

Thereafter, the endless tube 1 with the high alkali concentration in the first washing section 6, 7 washed out. The first washing section comprises, for example, two washing towers 6 and 7, which are passed through in succession by the endless tube 1. The endless tube 1 is passed from top to bottom over a Rundbreithalter through the first washing tower 6 and then runs from bottom to top also via a Rundbreithalter through the second washing tower 7. The Rundbreithalter in the wash towers 6 and 7 tension the endless tube 1 so that a uniform treatment over the entire circumference of the tubular fabric is guaranteed. The lye concentration in the first washing tower 6 is reduced in a first washing process to about 7 ° Baume and simultaneously cooled to 80 to 85 ° C. In the second washing tower 7, the lye concentration is reduced by further washing with hot water to about 2 to 3 ° Baume. This lye concentration then corresponds to about 10 - 20 grams of NaOH per kilogram of product. The squeezer 8 at the outlet of the second washing tower 7 ensures that as little liquor and washing water from the endless tube 1 as possible in the following expansion tank 9 in the transition region between pre- and post-treatment station 26, 27 taken becomes. As a result, the effort and the time for a necessary adjusting an optimum value of the alkali concentration for the aftertreatment in the expansion tank 9 is kept low.

The surge tank 9 is initially filled with cold water, so that the previously heated endless tube 1 is cooled to below 40 ⁰ C. This is necessary because the tubular fabric must be supplied cold to the subsequent peroxide bleach. As soon as the system is put into operation with goods, a certain amount of caustic soda enters the expansion tank 9 through the tubular fabric. In the expansion tank, this results in a low-concentration caustic soda solution whose liquor concentration during operation is continuously influenced by the liquor entrained in the tubular fabric. In order to obtain an almost constant lye concentration in the product for bleaching, located on the surge tank 9, a device 10 for measuring the density of the active liquid and thus to determine the concentration of the active agent. Together with the control device 11 results in a regulation of the alkali concentration. By not shown in Figure 1 device 10 on the expansion tank 9, the density is measured in this example. The regulation of the concentration of the active agent is shown schematically in Figure 2 and explained in more detail in the description of Figure 2.

About a further squeezing 13 at the outlet of the expansion tank 9 of the endless tube 1 runs with the desired residual liquor content of eg 2 - 3 ° Baume in the impregnation 14 of the aftertreatment station 27. In this impregnation section 14 in the form of an impregnation trough the endless tube 1 with bleaching liquor, which contains hydrogen peroxide (H ₂ O ₂ ), soaked. The bleaching chemicals, ie hydrogen peroxide, activators and stabilizers are metered by a control device 11 according to the goods speed and the weight of the tubular fabric, ie the endless tube 1 the impregnation trough in the impregnation 14 by a bleaching liquor feed 25. The impregnation trough is designed as small as possible so that a fast fleet exchange takes place. At the end of the impregnating section 14 is another squeezing 15. About this squeezing 15 passes the endless tube 1 in the subsequent damper 16, where it is heated by saturated steam to 98 - 102 ⁰ C and stored in a thermally insulated reaction chamber on a conveyor belt 18. The length and running speed of the conveyor belt 18 are designed to give the endless tube 1 for bleaching a reaction time of 10 to 15 minutes. Thereafter, the endless tube 1 runs in a first wash tower 19 of the aftertreatment station 27. There, the bleaching chemicals such as hydrogen peroxide (H ₂ O ₂ ) and the sodium hydroxide are washed out. In another trough 20 of the endless tube 1 can be neutralized with acid, to then be washed again in a second washing tower 21 of the aftertreatment station 27 hot. Thereafter, the endless tube 1 is deposited by a folding device 22, for example in a carriage 23.

A device 10 for continuous density measurement as part of the control of the alkali concentration in the expansion tank 9 is shown schematically simplified in Figure 2. The regulation of the lye concentration comprises the device 10 for measuring the density and thus the lye concentration of the liquor in the expansion tank, a control device 11, a control valve 12 in the fresh water inlet 24, and means and connecting lines for signal or data transmission. For example, a portion of the liquor in the expansion tank 9 is pumped continuously in a density measuring circuit and the current density of the liquor is measured by means of an arometer arrangement. The measured value is transmitted to a controller 11 and compared in the controller to a predetermined setpoint (e.g., 2 - 3 ° Baume). If the measured value deviates from the desired value, then the control device 11 causes the amount of fresh water in the second washing tower 7 to be changed

Pre-treatment station 26 is changed accordingly. For this purpose, the control device 11 is signal-transmitting with a e.g. electrically or pneumatically activated control valve 12 in the fresh water inlet 24 of the second washing tower 7 connected. If the alkali concentration in the expansion tank 9 is too high, the amount of fresh water supplied is increased in the second washing tower 7 and reduced if the alkali concentration is too low. A larger amount of supplied fresh water causes a stronger leaching and dilution of entrained liquor. As a result, the alkali concentration in the entrained liquor and subsequently in the subsequent expansion tank 9 drops.

Claims

claims

1. A process for textile finishing of textile tubular fabric, which is subjected in the form of an endless tube successively a first partial treatment by a first active liquid and a second partial treatment by a second active liquid, characterized by the following features: a) the process is performed as a continuous overall process in which the endless tube (1) in a pretreatment station (26) undergoes the first partial treatment and, on leaving this pretreatment station (26), continuously passes into an aftertreatment station (27), in which the second

Partial treatment takes place; b) at the end of the first part of the treatment, the concentration of the active agent in the first active fluid carried by the endless tube (1) is deliberately set to the value which is required at the beginning of the subsequent second partial treatment.

2. The method according to claim 1, characterized in that in both treatment stations (26, 27) successively proceed the following sub-processes: impregnation of the endless tube (1) with the active liquid, heating and reacting with the active liquid, diluting the active liquid and

Cooling down.

3. The method according to claim 2, characterized in that the process of diluting and cooling takes place at the end of the first partial treatment at least in its last phase by washing with water and that the

Concentration of the active agent in the first active liquid is adjusted by controlling one or more of the following parameters: amount and temperature of the washing water and the duration of the washing process.

4. The method according to claim 2 or 3, characterized in that the first

Partial process is a mercerizing with sodium hydroxide solution as the first active liquid and the second part of a bleaching process with a bleaching liquid as the second active liquid, wherein at the end of the first part treatment in the liquor carried by the endless tube (1), the liquor concentration optimal for subsequent bleaching is set.

5. The method according to claim 4, characterized in that the endless tube (1) during the transition from the pretreatment station (26) in the aftertreatment station (27) through a surge tank (9) is guided and that a branch current in the expansion tank (9) in accordance with the density measurement, the liquor concentration in the of the endless tube (1) entrained liquor at the end of the first part treatment is adjusted to the optimum value in the circuit.

6. The method according to claim 4 or 5, characterized in that the

Lye concentration in the fleet of the endless hose (1) entrained when entering the post-treatment station (27) 2 ° to 3 ° Baume.

7. The method according to any one of claims 4 to 6, characterized in that the reacting of the bleaching liquid with the endless tube (1) in the second

Partial treatment takes 10 to 15 minutes.

8. Plant for textile finishing of tubular fabric in the form of an endless tube, with a pretreatment station, in which the tube is treated with a first active liquid, and an aftertreatment station, in which the

A second active fluid is treated, characterized by the following features: a) pre-treatment and post-treatment station (26,27) are assembled into a single system, wherein the endless tube (1) in a continuous conveying operation from the pretreatment station (26) in the

Aftercare station (27) overrides; b) in the region of the transition from the pretreatment station (26) to the aftertreatment station (27), a device is arranged by which the concentration of the active agent in the first active liquid entrained by the endless tube (1) is set to a value which is the starting value for the

Treatment in the aftertreatment station (27) is optimal.

9. Plant according to claim 8, characterized in that in the pre- and in the post-treatment station (26, 27) each have at least one impregnation section (4, 14), at least one reaction section (5, 17) and at least one washing section are arranged.

10. Plant according to claim 9, characterized in that in the pretreatment station (26) mercerizing by means of sodium hydroxide solution and in the aftertreatment station (27) bleaching by means of a bleaching liquid, wherein in the region of the transition from the pretreatment station (26) in the aftertreatment station ( 27) is adjusted by the means for concentration adjustment, the concentration of the endless tube (1) entrained caustic soda solution to the optimum value.

11. Plant according to claim 10, characterized by the following features: a) between the pretreatment station (26) and the

Aftertreatment station (27), a surge tank (9) is arranged, which is filled with dilute sodium hydroxide solution and through which the endless tube (1) is passed; b) the device for concentration adjustment comprises a device (10) for continuous density measurement, through which a partial flow of the in the expansion tank (9) located, dilute sodium hydroxide is circulated; c) via a control device (11) is in accordance with the measured

Density value of the washing process in the washing section of the pretreatment station (26) influenced such that the optimum concentration value of the endless hose (1) entrained sodium hydroxide solution is maintained.

12. Plant according to claim 11, characterized in that in the washing section of the pretreatment station (26) for the inlet of washing water at least one of the control device (11) controlled control valve (12) is arranged, by which the amount and / or the duration of the on the endless tube (1) acting wash water is adjustable.

13. Plant according to one of claims 9 to 12, characterized in that the washing sections in the pre- and / or post-treatment station (26, 27) wash towers (6, 7, 21), which for guiding the endless tube (1) with equipped at least one Rundbreithalter.