VERFAHREN ZUM KONTINUIERLICHEN FAERBEN VON BAHNFOERMIGEN TEXTILEN FLAECHENGEBILDEN AUS CELLULOSEFASERN ODER DEREN MISCHUNGEN SYNTHETISCHEN FASERN

• Main Authors: HANS-ULRICH VON DER ELTZ, JOACHIM STEINBACH, HEINZ SCHMIDT
• Format: Patent
• Language: German
• Subjects: DYEING LEATHER, FURS, OR SOLID MACROMOLECULAR SUBSTANCES INANY FORM; DYEING OR PRINTING TEXTILES; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR; LAUNDERING; TEXTILES; TREATING TEXTILE MATERIALS BY LIQUIDS, GASES OR VAPOURS; TREATMENT OF TEXTILES OR THE LIKE

The sheet structures which comprise continuous sheets of tops, card slivers and spread-out tows and consist of cellulose fibres or blends thereof with synthetic fibres are, in a continuous process, a) padded with an aqueous dyeing liquor which is at room temperature, contains at least one sulphur dye reduced to the leuco form and is provided with an addition of a sodium polysulphide (Na2Sx; x = 2-5) which is in aqueous solution and acts as redox buffer, then b) for the purpose of fixing the padded leuco sulphur dye guided through in the plaited state for 1-10 min. at 80-98 DEG C or for 10-60 sec. at 110-220 DEG C, while retaining the moisture applied by the padding, through a heat-fixing chamber which is heated exclusively by hot air, and finally c) subjected to a reoxidation treatment to return the sulphur dye or dyes used to the water-insoluble disulphide form. Tops, card slivers and fibre webs can be dyed by this process without the need for a special steamer. Since no intermediate drying is necessary, time and energy are saved. While the requirement for reducing agent remains the same, an excellent appearance and good fixing even of deeper dyeings are obtained. The dyeings display good fastness. Since the process is a one-bath process, the procedure is simplified.