EP0945539B1 - Method and device for continuous alkali treatment - Google Patents

Description

The invention relates to a method and a device for the continuous alkali treatment of textile products with partial differences in thickness, such as tips and embroidery made primarily from cellulosic raw materials, but also consist of synthetic material can.

Lace is a flat textile object in the form of an ornament, the effect of which is shown through of the background by itself between the pattern shapes located openings is based.

The alkali treatments of lace and embroidery serve the fiber digestion and prepare the goods for bleaching, Dyeing and printing before. These alkali treatments are done currently discontinuous in the low concentration range. There are alkali, usually sodium hydroxide and soda, for use. Their effect can be the usual textile auxiliaries are supported.

DE 42 13 127 C 1 (preamble of claim 1) describes a continuous process described for the mercerization of textile webs, in which the wet web is initially mechanical is drained. The loading density of the pre-impregnated goods continuously measured and to them then becomes strong lye in a main impregnation field the application of the starch liquor in the gusset a pair of rollers and then the goods is squeezed in the pair of rollers. The to be fed concentrated lye is continuously calculated and controlled and is subject to a circulation system. Then the Goods supplied downstream treatment compartments.

According to EP 0 340 166 A 1, the mercerization is carried out with a spreader field described, the goods immediately on the shortest route from the vertical crushing unit for re-impregnation is placed on the tension chain. The Impregnation and stabilization of the goods is there already completed and the washing section is working only with spray nozzles.

DE 196 35 171 C 1 describes a method for washing out of polyvinyl alcohol base fabric made of lace and embroidery described, also according to the principle of spraying and sucking works. It also becomes Improvement of the drainage effect by hanging up described with a brush. This device is for continuous lye treatment is not provided and unsuitable.

The methods described in the aforementioned inventions and devices are generally not for one adapted lye treatment for lace and embroidery suitable. DE 42 13 127 C 1 and EP 0 340 166 A 1 work on the principle of squeezing and reaching for lace and embroidery in appearance only Inhomogeneity of effects. The continuous flow of goods of lace and embroidery on these devices not given.

The invention has for its object a method and to develop a device that the tips and Embroidery through an adapted alkali treatment like this be modified so that they have a very good fiber digestion have an evenly improved staining, a differentiated improved staining, a excellent printability, even using modern spray printing technology, and enable a very high degree of whiteness. The products should be managed continuously with lye of different concentrations and Temperature and length can be treated Width of the goods can be set in an exactly defined manner and there must be either homogeneous and inhomogeneous lye effects can be generated and there must be another Minimize alkali consumption.

According to the invention the task in the characterizing Parts of claims 1-5 solved.

The invention is described below using two exemplary embodiments explained in more detail.

Fig. 1

Prinzipskizze einer Seitenansicht der Vorrichtung ohne Vorimprägnierabteil

Fig. 2

Prinzipskizze einer Seitenansicht des Haupt- und Nachimprägnierabteils mit Saugtechnik

The drawings show:

Fig. 1

Schematic diagram of a side view of the device without pre-impregnation compartment

Fig. 2

Schematic diagram of a side view of the main and post-impregnation compartment with suction technology

The device consists of a pre-impregnation compartment, a main impregnation compartment 1, a post-impregnation compartment 5, a stabilizing compartment 15 and one Washing section 19. The pre-impregnation compartment, not shown consists of a usual low-tension working Wide washer and a squeegee on the End of the pre-impregnation compartment is arranged and a Has cover. The main impregnation compartment 1 exists from the first pair of rollers 2 and 4, which run against each other are arranged and thereby form a gusset 3. The main impregnation compartment 1 has a separate one Not shown drive. The re-impregnation compartment 5 consists of a chassis 6, which is under the roller 4 of the first pair of rollers 2, 4 and the subsequent roller 8 of the second pair of rollers 7, 8 attached and heated and is equipped with a temperature control device. The axes of the rollers 4 and 8 are at the same height and parallel to the axis of the roller 2. The roller 7 is closed the rollers 4 and 8 arranged on gap, so that the roller 7 is supported on the rollers 4 and 8.

The roller 8 is arranged so that by means of both sides Spring pressure on the roller 10 of the following vertical crushing unit 9 is pressed. Between the rollers 7 and 8 or the roller 10 of the vertical crushing unit 9 is a spray tube 11 which is connected to the chassis 6 stands, attached. Optionally, the post-impregnation compartment 5 as shown in FIG. 2 so that instead the roller 8 are two parallel rollers, the supporting roller 12 and the goods guide roller 13 and a Suction bar 14 are located. The roller 12 is also a material guide roller and at the same time the holder for the roller 7. The roller 13 is a material guide roller over the suction bar 14 arranged. The chassis 6 is through a smaller chassis 6a replaced and is located on the underside of the roller 4. The spray tube 11 is out of operation. The vertical crusher 9 of the post-impregnation compartment 5 has one separate drive. The stabilization compartment 15 exists of two endlessly running on the edges of the textile product Needle or clip chains with web guides and needle devices 16, the inlet field 17, the Residence zone 18, a washing section 19 and a downstream Pull-out crushing unit 20. The washing section 19 is located 1 at the end of the stabilization compartment 15, which also includes the entry field 17 and the dwelling zone 18. The inlet field 17 is adjustable in width. Above the washing section 19 are spray nozzles 21 at equal intervals attached across the width of the textile product.

Each in front of the spray nozzles 21 is above the path of the textile product and across the entire width of the Stabilizing compartment 15 a partition 22 is arranged. Between the spray nozzles 21 are suction bars 23 with Sealing lips attached. Over the sealing lips of the squeegees 23 there is a sealing brush 24. Below the spray nozzle 21 and the suction bar 23 is the drip pan 25. The stabilizing compartment 15 with the pull-out crushing unit 20 has one drive each.

The procedure is as follows:

example 1

As a textile product, an air tip made of 100% Cotton provided. for a modern spray printing process should be pretreated. This requires homogeneous mercerization. The top will be there boiled alkaline and submitted wet to the device. For this purpose, it should contain 270 g / l sodium hydroxide solution be mercerized. The lace and also embroidery can be pre-impregnated dry or wet and there through a content of sodium hydroxide solution 50 g / l be prepared for the subsequent process. Through a pre-impregnation They will be finished with an even finish and very low moisture level. The fleet content is max. 80%. In this case After pre-impregnation, the tip has a sodium hydroxide solution of 30 g / kg. The aspirated tip contains still 60% water.

The fleet consists of those used for shock de-leaching rinsing water from the following compartments.

The suction bar works at the end of the pre-impregnation with a special cover to a low Moisture level with low energy consumption too to back up. The tip then becomes the main impregnation compartment 1 fed and impregnated with sodium hydroxide solution. Through the opposite rollers 2 and 4, a gusset 3 formed and thus exerted pressure. In this Gusset 3 is made of alkali solution using a metering pump the suds container filled. This is from the Tip picked up or flowing over an overflow back to the tub. In the suds container there is a temperature measurement and control device that has an intended temperature the lye enables and a lye concentration measurement and control device that the backflowing Amount of alkali lye, commercially available alkali lye and water, mixed to alkali, which in turn the gusset 3 is supplied.

wobei:

K_ware :

Konzentration der Natronlauge auf der Ware in g/l

Kv

: Konzentration der Natronlauge auf der Ware durch die Vorimprägnierung in g/l

K_H

: Konzentration der Natronlauge im Zwickel der Hauptimprägnierung in g/l

AE₁

: Abquetscheffekt der Ware nach der Vorimprägnierung in %

AE₂

: Abquetscheffekt der Ware nach der Hauptimprägnierung in %

The main impregnation 1 is decisive for obtaining the final concentration of the sodium hydroxide solution. It is calculated as follows:

in which:

K _goods :

Concentration of the sodium hydroxide solution on the goods in g / l

Kv

: Concentration of the sodium hydroxide solution on the goods through the pre-impregnation in g / l

K _H

: Concentration of the sodium hydroxide solution in the gusset of the main impregnation in g / l

AE ₁

: Squeezing effect of the goods after pre-impregnation in%

AE ₂

: Squeezing effect of the goods after the main impregnation in%

K _ware is generally up to 300 g / l sodium hydroxide solution and K _H should be a maximum of 600 g / l sodium hydroxide solution. After the main impregnation, the tip still contains 110% water at a squeezing pressure of 5 bar. According to Formula 1, the alkali concentration of the main impregnation must be 480 g / l sodium hydroxide solution. As soon as the tip leaves the horizontal crushing unit of the main impregnation compartment 1, it arrives at the post-impregnation compartment 5 in the bound goods run. In the post-impregnation, the concentration of sodium hydroxide solution which corresponds to the target concentration of the sodium hydroxide solution on the tip, in the example 270 g / l, is used. The tip is impregnated in the chassis 6, squeezed off by the roller 7 resting on it, impregnated again by means of a spray tube 11, squeezed again by the roller 7 resting on it, impregnated again in the chassis 6, dewatered by the lower roller 10 of the vertical crushing unit 9. impregnated by spray tube 11 and finally dewatered in the vertical crushing unit 9 at 5 bar to a liquor content of 110%. The tip generally runs in the bound goods run.

The squeezing pressure of either 3 - 8 bar of the main impregnation compartment 1 and the vertical crushing unit 9 can optionally also be of different heights and thus the Squeeze effect fluctuate. Since it can be assumed that in the vertical crushing unit 9 in the sense of a minimized Use of caustic solution takes place to a maximum no or only a slight excess of lye in the Chassis 6 arise, the dilution of the commercially available Sodium hydroxide solution is used and so the main impregnation is fed.

The re-impregnation can also optionally be carried out according to FIG. 2 be carried out so that the tip first in Chassis 6a impregnated by the roller 7 lying thereon squeezed under the supporting roller 12 above the Suction bar 14 under the guide roller 13 and in the bound Goods run to the vertical crushing unit 9 is fed. The Tip is through the suction bar 14 to a liquor content brought by 100%. The extracted sodium hydroxide solution is the Chassis 6a of the re-impregnation compartment 5 is fed again. The excess lye is used to dilute the commercially available Sodium hydroxide solution used and so the main impregnation fed again. The speed of the vertical crusher 9 of the post-impregnation compartment 5 can deviate negatively or positively from the main impregnation compartment 1. In the example, the speed difference of the vertical crushing mechanism is 9 + 1%. The tip leaves the vertical crushing unit 9 and comes over a short distance on the tension chain of the Stabilization compartment 15. The speed of the Tension chain can be negative or positive to the main impregnation compartment 1 deviate. In the example, the speed difference is the tension chain + 2%. The tip is also open in the conical inlet field 17 brought the desired width, in the example to + 2% the starting width and then by lingering this state stabilized. The latitude and Length gain of the tip is thus in length and Transverse direction 2% each. In the stabilized state Tip of the washing section 19 fed and by spraying and suction in the countercurrent principle without changing the length and width of the tip. Doing so first through the spray nozzle 21, the goods with the 1-3 times the amount of water at a temperature of optionally up to 98 ° C, then by the Suction bar 23 drained with a vacuum of 0.5 - 0.9 bar works. The suction bar 23 is with a Sealing brush 24 equipped, which ensures that the Vacuum system with low electrical energy requirements achieved maximum drainage. That before the Spray nozzle 21 lying partition 22 and the forward movement the goods separate the individual washing liquors and enables precise work in the counterflow principle. This washing process is repeated three times at the end of the washing section the goods over a Pull-out crusher 20 are drained and removed can. The lye concentration on the goods is there under 50 g / l.

By spraying - 100% of the weight of the goods - and the Suction process becomes at a vacuum of 0.6 bar Lye minimization on the top of approx. 50% + 50% the residual liquor content of the wash liquor or by the Syringes - 200% of the weight of the goods - a lye minimization at the peak of approx. 33% + 66% of the residual alkali content reached the wash liquor. The procedure and the use of alkaline wash water enables these positive washout results.

According to the example, the following concentrations and Quantities relevant.

Sodium hydroxide solution is present in the first spray tube 21 a concentration of 94 g / l, the liquor temperature is close to the cooking temperature. It will be 100% from Goods weight applied to fleet. The top leaves the compartment with 182 g / l sodium hydroxide solution. The vacuumed Fleet of the first squeegee 23 is in production of the caustic soda liquors for main and secondary impregnation used to dilute the strong alkali.

The second spray tube 21 brings liquor with a sodium hydroxide content from 50 g / l. The liquor temperature is approx. 90 ° C. There are 200% of the weight of the goods Fleet applied. The tip leaves the compartment with 94 g / l sodium hydroxide solution. The extracted liquor is heated up and fed 50% to the first spray tube 21. The remaining liquor is used for pre-impregnation. The third spray tube 21 carries liquor with a sodium hydroxide solution from 28 g / l to. The liquor temperature is approx. 90 ° C. There are 200% of the weight of the water upset. The tip leaves the compartment at 50 g / l Caustic soda. The squeezed liquor is heated up and supplied to the second spray tube 21.

Then the top is on separate technology deacidified as usual.

The laces and embroidery are excellent Dye absorption capacity and significantly improved textile properties. The consumption at Sodium hydroxide solution is used consistently greatly reduced in the overall process.

Example 2 Creation of shadow colors on cotton drill embroidery

The alkaline boiled and pre-bleached embroidery can be fed to the pre-impregnation compartment analogously to Example 1 and be treated there or they will be like In the present example 2, the main impregnation compartment immediately dries 1 submitted and with sodium hydroxide solution in the concentration range from 50 g / l to 300 g / l impregnated and squeezed at 5-6 bar. Because of the differences in thickness the tip enriches itself when squeezed Sodium hydroxide in the embroidery base, or in the tip itself there is only a reduced amount of sodium hydroxide solution / kg of goods. It passes through the post-impregnation compartment 5 without additional Exposure to lye. Changes in length and width the embroidery will not be done.

In the conical inlet field, the exit length and width adjusted again. In the washing section 19, As shown in example 1, the embroidery is washed out.

Depending on the thickness differences of the embroidery and the sodium hydroxide concentration shows the one treated in this way Embroidery after dyeing between the embroidery base and the embroidery hue differences that are targeted for Shadow colors can be used on the pattern side can.

List of the reference symbols used

1

Main impregnation compartment

2nd

roller

3rd

gore

4th

roller

5

Post-impregnation compartment

6

chassis

6a

chassis

7

roller

8th

roller

9

Vertical crushing machine

10th

roller

11

Spray tube

12th

roller

13

roller

14

Squeegee

15

Stabilization compartment

16

Web guide and pin devices

17th

Infeed area

18th

Dwell zone

19th

Washing section

20th

Pull-out crusher

21

Spray nozzles

22

Divider

23

Suction bar 23

24th

Sealing brush

25th

Drip pan

Claims (5)

1. Method for the continuous alkali treatment of web-like textile products with partial thickness differences, in particular of lace and embroidery, these being subjected to alkaline pretreatment, being preimpregnated with a weak caustic soda solution, being dehydrated, having their loading density measured and being delivered for main impregnation (1) with concentrated caustic soda solution, the caustic soda solution being supplied via a gusset (3), and the products subsequently being squeezed off and being delivered to a dwelling and stabilizing zone (15) in the form of rollers or a tentering frame, and reconditioning of the caustic soda solution being carried out, the concentration and temperature of which are corrected, said caustic soda solution being delivered to the gusset (3) again, and the reconditioning of the treatment liquors taking place on the countercurrent principle, characterized in that

   during main impregnation (1), caustic soda solution is supplied to the alkali-scoured and preimpregnated textile product according to the formula

   

   (the various parameters being explained in the description),
   but up to a maximum of 600 g/l, in the gusset (3) of the first pair of rollers (2, 4),

   the textile product passes from the main impregnation compartment (1) in a tied-up fabric run through the roller (4) of the first pair of rollers (2, 4), which at the same time serves as a squeezing roller of the main impregnation compartment (1) and as a first fabric guide roller of the postimpregnation compartment (5), along a very short path into the postimpregnation compartment (5) and is treated therein with a caustic soda solution concentration corresponding to the desired concentration of the caustic soda solution on the textile product, the latter being impregnated in the chassis (6), is squeezed off between the roller (4) of the first pair of rollers and the roller (7) of the second pair of rollers, is impregnated again by means of the spray pipe (11), is squeezed off between the roller (7) and the following roller (8), is impregnated in the chassis (6), is squeezed off between the roller (8) and the roller (10) of the vertical squeezing assembly (9), is impregnated by means df the spray pipe (11) and is dehydrated to a low liquor content in the vertical squeezing assembly (9), and, after leaving the postimpregnation compartment (5), is subjected to no further caustic soda solution,

   for setting the desired length and width, the textile product is first led from the main impregnation compartment (1) into the postimpregnation compartment (5), speed differences between the vertical squeezing assembly (9) and the main impregnation compartment (1) being capable of being set positively or negatively,

   subsequently, the stabilized textile product highly dehydrated by means of the vertical squeezing assembly (9) or the suction beam (14) is delivered to the washing stage (19) and is shock-treated for the removal of caustic soda solution by means of spraying and suction.
2. Method particularly according to Claim 1, characterized in that postimpregnation first takes place in the chassis (6a), and the textile product is squeezed off by the roller (7) resting on it, in conjunction with the roller (4), and is squeezed off once again in conjunction with the roller (12), which serves as a fabric guide roller and forms the mounting of the roller (7), and is subsequently delivered in a free fabric run under the supporting roller (12) to the suction beam (14) and passes under the roller (13), which is arranged as a fabric guide roller above the suction beam (14), to the vertical squeezing assembly (9), a liquor content of 100% being achieved by means of the suction beam (14), and the sucked-off caustic soda solution being recirculated to the chassis (6a), the excess caustic soda solution being supplied to main impregnation again, the speed differences and the further treatment of the textile product taking place according to Claim 1.
3. Method according to Claim 1 or 2, characterized in that the scoured and prebleached textile product is presented, dry, to the main impregnation compartment (1), is impregnated with a caustic soda solution in the concentration range of 50-300 g/l and is squeezed off at 5-6 bar between the rollers (2 and 4).
4. Apparatus for carrying out the method according to one of Claims 1 to 3, consisting of a preimpregnation compartment with a full-width washing machine and of a main impregnation compartment (1) with an arrangement of rollers (2, 4), above which spray pipes (11) are arranged and below which collecting vessels (6) and feed pumps with pipelines are arranged, for generating a circulation of the treatment fluid from the collecting vessels (6) via the spray pipes (11) back to the collecting vessels (6), and, furthermore, consisting of rollers (2, 4) running in opposition to one another and forming a gusset (3), characterized in that

   the main impregnation compartment (1) with a direct supply of the caustic soda solution to the gusset (3) is followed by a postimpregnation compartment (5) and the latter is followed by a stabilizing compartment (15) with a washing stage (19),

   the main impregnation compartment (1) consists of known rollers (2 and 4) running in opposition to one another and forming a gusset (3), the roller (4) being a fabric guide roller of the postimpregnation compartment (5),

   the postimpregnation compartment (5) has a heatable chassis (6) below the rollers (4 and 8), these rollers (4 and 8) being located at the same height in relation to the roller (2), the roller (7) being arranged so as to be capable of being supported on these rollers (4 and 8), and, furthermore, the roller (8), together with the spray pipe (11) located above it, being arranged so as to be capable of being pressed onto the roller (10) of the following vertical squeezing assembly (9),

   a washing stage (19) with spray nozzles (21) and a draw-out squeezing assembly (20) is arranged at the end of the stabilizing compartment (15) which also comprises the entry zone (17) and the dwell zone (18), a separating plate (22) being located upstream of the spray nozzles (21) over the entire width of the stabilizing compartment (15), and there being located between the spray nozzles (21) suction beams (23) with sealing lips, above which sealing-off brushes (24) lie, and a known collecting trough (25) being arranged below these spray nozzles (21).
5. Apparatus according to Claim 4, characterized in that the postimpregnation compartment (5) has, in the clearance of the roller (8), two parallel-arranged rollers (12 and 13) with suction beams (14), the chassis (6a) being located on the underside of the roller (4) to the exclusion of the spray pipe (11).

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