DE1610994A1 - Method and device for the notching and bleaching of textiles in wide webs - Google Patents

Description

Dr. Expl.

1.5-545-D February 15, 1966.

JOH. KLEINEWEFERS SONS, KREFELD Patent and utility model help application

Method and device for the notching and bleaching of textiles in wide webs

The invention relates to the cupping and bleaching of Cotton, the cotton being boiled in a caustic soda liquor from the in a preliminary process to the bleaching process Still adhering seed coats and impurities are freed and the fibers for the subsequent actual bleaching process is made more receptive "

Such methods are known. So be in discontinuous Way the textiles are cooked in open vats or in closed pressure vessels. It is also known It has become possible to impregnate textiles in a continuous flow of goods with the caustic solution and through high-pressure vessels to pass through the atmosphere with steam, It is also known the buckling and bleaching process by impregnation with a

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161089A

Mixing of the two liquors in a continuous flow of goods in a pressure vessel with a steam atmosphere.

Because of the savings in chemicals that can be achieved in this way, it has now proven to be expedient to carry out the buckling and bending in a continuous process in separate pressure vessels. It has been found to be a disadvantage here that the buckling and the peel dissolving take place much more slowly than the reaching of the degree of whiteness during bleaching, so that the passage through the system takes place at different speeds or the buckling has to be repeated twice. One could, however, choose the pressure vessel for the booking process to be significantly larger and thus extend the throughput time, but this entails additional expenditure on machines and also disrupts the disposition for the optional use of the individual pressure vessels.

According to detailed investigations, the cause of the so slow going process ψ is to be seen in the fact that steam condensate immediately precipitates on the material web, which is practically cold in the pressure vessel Concentration causes. This circumstance then has the further disadvantage that, as a result of the lower degree of efficiency, the consumption of caustic is higher in the end, or that more weak caustic has to be worked up in an expensive process.

According to the invention, these disadvantages are avoided by

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that the beuching process as well as the subsequent bleaching process be carried out so that the web to be treated is introduced into the pressure vessel without impregnation, the Treatment liquor is in the pressure vessel, with a so high liquid level so that the web of material does not come into contact with the steam atmosphere when it enters the pressure vessel, but under the fleet level in the heated to well over 100 Treatment liquor arrives and continues within this will. This has the effect that the material web entering the pressure vessel cold suddenly increases to a high level Temperature is heated and not, as before, on the cold incoming Web a reduction in the alkali concentration. The impregnation is caused «Experiments have shown that by the direct introduction of the goods into the hot liquor the duration of the visit process from previously 2-5 minutes to about 1/2 minute can be reduced, so that now the web of material hits the pressure vessels at the same high speed for the beucfeen and for the bleaching go through one after the other can. Further features of the invention are given in the description of the exemplary embodiment shown in the drawing referred »

As the drawing shows, they are attached to a kettle-shaped pressure vessel 1 the pressure-tight product passages 2 for the passage of the web 3 in the center of the bowl or in the lower part. Part of the boiler arranged and the fleet level 4 of the Beuchflotte so high that the incoming and outgoing goods do not interact with the steam atmosphere

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can come into contact. To extend the throughput path, the web can still pass over some within the fleet arranged pulleys 5 are guided and leaves the pressure vessel at the right passage device in the direction of the arrow.

Through a steam supply 6, the required pressure is above one atmosphere and thus a treatment temperature of about Maintain 100 °. Naturally, the liquor has to be filled in already heated to excessive steam condensation and thus to prevent liquor dilution. It is therefore expedient to have a heater coil inside the boiler 7 arranged for steam or electrical heating. net, the heating output of which is regulated by a temperature sensor. According to another invention, the heat exchanger is inside of the pressure vessel arranged eccentrically in order to achieve a forced circulation and thus a better heat transfer.

During the process of wetting, the liquor becomes like also very quickly and heavily contaminated by the peeled off shells themselves, so that it is necessary for trouble-free continuous operation It is of crucial importance to constantly regenerate the liquor. According to a further invention, this is done by that the liquor by one in the pressure vessel itself or - even better - by one arranged outside the vessel Sludge catcher and filter is circulated. For this purpose, the liquor runs via a line 8 into the also as a pressure vessel trained cleaning apparatus 9, from there over a

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Line 11 and a circulation pump 12 back to the beuching and bleaching kettle. The cleaning apparatus 9 is provided with easily exchangeable filter inserts 10, where it is used when the filter is changed disconnected from pressure vessel 1 by means of quick-closing valves IJ will. After the contents of the cleaning vessel have been cooled to about 90 ° by a cooling coil (not shown) * the filter inserts can be changed quickly, after which after filling the valves 13 can be opened again with fresh liquor. Part of the treatment liquor is made up of the goods passing through taken away, so that it has to be constantly replaced from the outside. This is expediently done by adding liquor by means of a pressure pump 16 via a check valve 17 »The pump is controlled by a liquid level regulator attached to the pressure vessel 14 automatically via an amplifier device 15 off and on »

As already mentioned, this process can also be used for lead-drawing with the same beneficial effect as the Laugenerspanis Sodium chlorite can be used ". There is a special Advantage of the invention is that now without the previous In some cases, bleaching with chlorine dioxide is also made possible. As is known, this bleaching process has been in practice so far found little application because a lot of chlorine gases are released and you step into the work room and also the equipment, even if it is made of chrome-nickel alloys, from Ghlorgas be strongly attacked in the steam atmosphere "

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However, since the usual materials of chlorine dioxide solutions almost at all will not be attacked, according to the finding suggested that the pressure vessel be completely closed with the liquor fill so that you can no longer see any air or atmosphere can form. This means that the steam nut 6 can be omitted entirely, with the lightening of the fleet in the vox * bes rather flat manner can be done from inside or outside. Against this must be the inevitable Changes in volume are absorbed by a spring-loaded expansion piston or expansion cylinder will. Furthermore, the regulation of the fleet is now carried out by a pressure gauge or by one of the expansion elements actuated contacts.

To get through when the goods exit the pressure vessel the rapid evaporation of chlorine gases from the raujnatBOsphere to keep away, it is advisable to keep the goods for a short time Let the piece run in a channel in which the goods pass through Spraying with water is cooled and the chlorine gases are sucked off and dissolved in water.

The arrangement can also be made in such a way that the liquor is heated in a pressure vessel outside the pressure vessel, for example between a pressure vessel and a. Circulation pump arranged, heat exchanger is. ;

Claims (1)

Ί6Ί0994 i? a tent to the test 1.) Method of cupping or bleaching textiles in wider Web with continuous passage through a pressure treatment vessel with a pressure of over one atmosphere and a temperature of over that the pressure vessel (1) is mostly or completely filled with liquor and that the material web (»below the liquid level (k) without impregnation and directly into the liquor in the pressure vessel is introduced and continued within the same. 2 ·) Method according to claim 1 "characterized" that the liquor through an inside or outside the pressure vessel (1) arranged Reiuiguiigsappar & t (9) pumped around and constantly cleaned Einrlehtiisig for performing the method according to claims {1 and 2, characterized by such an arrangement of the Usalenicrollen lying within the Difuakgefäßes (1) (5) and iron such loan fleet stand (4) such that the product flow from the inlet to suit outlet within the fleet takes place. Device according to claim $ _g, characterized in that volisfcSisaiges · Filling of the pressure vessel (J.) in the circulating [8 "SS | © in @ laäbisch € s DruckausgMehelement % ISve SAD 5.) Device according to claim ~ 5, characterized by a heat exchanger (7) arranged inside or outside the pressure vessel (l). 6.) Device according to claim 3 to 5 * characterized .by an eccentric arrangement of the heat exchanger (7) within of the pressure vessel (l). 7 ·) Device according to claim 3> characterized in that the liquor consumption by one of a liquid level regulator (14, 15) controlled pressure pump (16) is refilled. 8.) Device according to claim 5 to Ί> characterized in that the control of the refill pump (16) od by a contact manometer. The like. Is triggered. 9.) Device according to claim Ju. ff., characterized by 'a goods tunnel that rests directly on the outlet slot (2), in which the goods (5) are cooled and the gases released are sucked off. 109809/0428