Bleaching and dyeing; fluid treatment and chemical modification – Fluid treatment – Special forms and forming
Patent
1992-08-12
1994-11-01
Stinson, Frankie L.
Bleaching and dyeing; fluid treatment and chemical modification
Fluid treatment
Special forms and forming
68 13R, 68 22R, 68200, D06B 312
Patent
active
053597435
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an improved continuous process and installation for treating textile fabric webs.
A two-step coating method and a corresponding installation are disclosed in German Published Patent Application 37 33 997. An important feature of this two-step liquor application is the possibility of applying more liquid to the web, that is, achieving moisture contents (i.e., liquid weight in proportion to the weight of the dry fabric) which lie far above those that are attainable using devices that work with squeezing devices, which exhibit an applied pressure that produces a uniform line pressure and prevents the fabric web from slipping through. In the second coating device, the additional liquid is only applied, but is not exchanged for the liquid quantity applied by the first coating device. The second coating is, therefore, purely an additional impregnation. The question of how such a heavily loaded fabric web should be directed in the ager to prevent the liquid from running off or dripping off is not addressed by this patent application.
The present invention is directed to the problem of developing a process, and a corresponding installation, which will ensure that a fabric web which is heavily loaded with treatment liquor will undergo the proper treatment sequence in an ager.
SUMMARY OF THE INVENTION
The present invention provides a continuous process for treating textile fabric webs in which the web is guided in the heating zone of an ager in a zig-zag path formed by several essentially horizontal loops that are located one over the other.
Guiding the web in essentially horizontal loops in the heating zone of the ager prevents the liquid from running down the web and also prevents any related unevenness in the liquid coating of the fabric web which would occur at the vertical sections of the conventional guidance path of a fabric web in an ager. The amply applied treatment liquor can penetrate into the web while in the dwelling section, which is made up of a number of essentially horizontal loops. An important element of the present invention is that the liquid carried along when the fabric web runs towards a guide roller on the side of the fabric web facing this guide roller is drawn into the nip between the fabric web and this guide roller and is pressed into the fabric web. This promotes the mixing, for instance, of several existing treatment liquors, the penetration of the treatment liquors into the fabric web, and the interaction of the treatment liquors in the depth of the fabric web. Therefore, the heating zone not only has a temperature-increasing function, but also a force-through and a reaction function. By the end of the heating zone, which is composed of horizontal loops, the last applied treatment liquor has been forced into the web, and the danger of the liquid coating running dripping off, causing local unevenness, is thereby reduced. Therefore, in principle, the subsequent guiding of the web in the ager can occur in the usual way, although special methods for guiding the web are preferred for certain treatments.
Guiding a fabric web in horizontal loops is known in and of itself from the German Printed Patent 17 10 477. However, this reference concerns an open-width processing operation and not the formation of a heating zone in an ager. Such a guidance method, also in an ager, is to be inferred from DE-A 29 08 345, however the horizontal guidance does not occur in a feeding zone and is not used in connection with a liquid application. The same is true of U.S. Pat. No. 4,873,846, in which virtually the entire guidance section exists in the ager in horizontal loops.
In the case of FR-A 1,181,404, the fabric web runs in upright loops through a tank with a large supply of bleaching liquor. After passing a vertical heating zone, the fabric web is folded in a J-box, where it dwells for a period; neither a horizontal guidance system nor a steam atmosphere is present. The feature of feeding the fabric web after a liquid application into an ag
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Benz Bernhard
Keller Walter
Kurschatke Wolfgang
Kutz Johannes
Meyer Christian
Eduard Kusters Maschinenfabrik GmbH
Stinson Frankie L.
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