Bleaching and dyeing; fluid treatment and chemical modification – Fluid treatment – Gas or vapor
Patent
1997-06-12
1999-03-23
Stinson, Frankie L.
Bleaching and dyeing; fluid treatment and chemical modification
Fluid treatment
Gas or vapor
8151, 68 5D, 34652, D06B 310
Patent
active
058853057
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for dye fixing in connection with reactive dyeing of cellulose goods, with a padding machine for applying a dye liquor containing the reactive dyestuff to the goods, and with an air dryer connected downstream of the padding machine having a chamber with a goods inlet and outlet, as well as a controllable draw-off conduit and a controllable recirculating fan. The recirculating fan preferably aspirates the air via a heating register with the aid of a ventilator. The ventilator and/or heating register can be controllable. It is therefore also possible to call this a recirculating heating fan.
The device is preferably intended to perform a reactive dye process by means of a dye liquor containing auxiliaries for binding the reactive dyestuff to the cellulose fibers. Within the framework of the invention the term "cellulose goods" includes textile goods webs made of cellulose yarn or fibers, including cotton, viscose, PES/viscose, PES/co, viscose/wool, PA/wool, modal fibers and the like. If it is stated that the air dryer has a chamber for inserting and removing the goods, as well as a draw-off conduit and recirculating fan, this also includes a plurality of at least two chambers with inlets and outlets and/or a plurality of at least two draw-off conduits and recirculating fans per chamber.
Today, mainly four methods are employed world-wide for the continuous dyeing of mesh or woven goods, for example also made of 100% cellulose, with reactive dyestuffs, namely the pad-batch method with a cold retention time between padding and washing, the pad-dry thermo-fixing method with a drying and a hot-air fixation passage between padding and washing, the pad-steam method with a steam passage between padding and washing, and the pad-dry-pad steam method with an intermediate drying stage and a steam stage between padding and washing.
The reactive dyestuffs being used can be classified by the strength of their reactivity. The reactivity of the dyestuffs has an effect on the length of the retention time in connection with the pad-batch method, on the temperature and time in connection with the pad-dry thermo-fixing method, and on the temperature as well as time in connection with the pad-dry-pad steam process. The amount of dye yield and/or of the degree of fixation are functions of reactivity. The dyes which can also be employed in cold dyeing systems at 40.degree. C. also have a reactivity increasing in the following series: monochlorotriazine, vinyl sulfone, dichloroquinine oxaline, monofluorotriazine, difluorochloropyrimidine and dichlorotriazine.
To bind the reactive dye to the fibers, the most diverse types and amounts of auxiliaries are recommended by the dye manufacturers, depending on the method. For example, with the pad-batch method, up to 30 g/l of sodium carbonate, 35 ml/l of NaOH 38.degree. Be, 70 ml/l of water glass 37.degree. to 40.degree. Be and 80 g/l of urea are possible. With the bad-dry thermo-fixing method up to 30 g/l of sodium carbonate, 5 g/l of common salt, 20 g/l of sodium bicarbonate and 200 g/l of urea are used, and with the pad-steam method and the pad-dry-pad steam method up to 30 g/l of sodium carbonate, 20 ml/l of NaOH 38.degree. Be and 250 g/l of common salt/Glauber's salt. These auxiliaries, in particular soda lye, water glass, sodium carbonate, urea and common salt, which are used in relatively large amounts, partially get into the exhaust air, but to the greatest part into the waste water during the washing process following dye fixation.
In a desire to prevent the burden on the exhaust air and waste water during the reactive dyeing of cellulose goods, to reduce the required machinery and to perform the dyeing process with a reduced use of energy over a shorter time, the inventor arrived at the realization to connect the reactivity of the dyestuffs themselves with the drying behavior of the treated goods in such a way that an optimal dyeing yield can be achieved without the large or aggressive amounts of auxiliaries, such as urea, water glass, sodium carb
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A. Monforts Textilmaschinen GmbH & Co.
Stinson Frankie L.
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