Method of and device for coloring of textiles

Abstract

Coloring of continuous textiles includes pad dying the textiles many times in at least one trough; subsequently green painting the textiles in an oxidation line; then washing and drying the textiles; and expelling oxygen from the textiles immediately before each pad dying, wherein a reintroduction of oxygen in the textiles is prevented before each green painting.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to a method for continuous coloring textiles, as well as to the device for performing the method. [0002] Methods and devices of this type are known in the art, for example for indigo coloring of textiles, in which a coloring substance which is not soluble in water is converted by means of alkali or reduction agent into a water-soluble form which has affinity to threads. In this manner the coloring substance can color the threads of the textiles, which is also called pad dying. After a subsequent oxidation which is also known as green painting, the coloring substance obtains indigo blue color. Also, other copper coloring substances such as indanthrene and sulphur coloring substances can be used. The textiles in this application include textile webs or threads. [0003] German patent document DE 43 14 402 A1 discloses a method of indigo coloring of threads, in which the threads are pad dyed with a coloring substances many ...

AI Technical Summary

Benefits of technology

[0006] Accordingly, it is an object of the present invention to provide a method for coloring of textiles, in which they are pad dyed many times with coloring substances and subsequently in an oxidation line are green painted, wherein the method and the device are improved so that considerable quantities of chemicals can be saved and simultaneously a uniform coloring result can be provided.

[0011] The inventive method eliminates these disadvantages, and it prevents oxidation of coloring substances and auxiliary substances, without being used for the coloring process. When compared with known methods, a saving of 30-40% of the total consumption of chemicals with corresponding cost reduction is possible. Furthermore, coloring results are obtained.

[0012] The expelling of the oxygen by emersion in a liquid and subsequent squeezing in accordance with another feature of the present invention guarantees its complete removal. The use of washing water guides chemicals, which are lost in known methods with the waste water, back into the covering process, so that they can be again utilized. The washing water is oxygen-free, it has the required pH value, and therefore it suits the best for the expelling of oxygen from textiles.

[0013] The oxygen-free atmosphere between the expelling of the oxygen and the subsequent green painting prevents that the textiles, before or after wetting with a coloring substance, again take oxygen and introduce it then into the coloring bath. The maintaining of the once produced oxygen free atmosphere is possible with very low expenses, since in operation it is practically not influenced by the passing textiles.

[0015] In accordance with another feature of the present invention, a device for coloring of textiles is proposed, which includes a plurality of coloring troughs each connected with a supply of a coloring substance; a second squeezing mechanism connected after each of said coloring troughs; a plurality of oxidation lines each arranged behind the second squeezing mechanism; a washing trough; a dryer; means for expelling oxygen from the textiles arranged immediately before each of said coloring troughs; further means which prevent a contact of the textiles with oxygen between each means for expelling and the second squeezing mechanism.

Problems solved by technology

Oxygen in a coloring bath causes an oxidation of a coloring substance, so that it no longer has affinity to threads or in other words it is water-insoluble and can no more be used efficiently for coloring.

Furthermore, the oxygen acts so that auxiliary substances such as reduction agents and alkali are consumed and / or converted into an inefficient form.

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