Classifications

• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
  • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
  • D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
  • D02G3/04—Blended or other yarns or threads containing components made from different materials
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2201/00—Cellulose-based fibres, e.g. vegetable fibres
  • D10B2201/01—Natural vegetable fibres
  • D10B2201/02—Cotton
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2201/00—Cellulose-based fibres, e.g. vegetable fibres
  • D10B2201/20—Cellulose-derived artificial fibres
  • D10B2201/22—Cellulose-derived artificial fibres made from cellulose solutions

Definitions

• the invention relates to blends of fibres in the form of yarns and threads from cotton with cellulosic staple-fibres of the Lyocell type as well as articles therefrom.
• amine-oxide-process or “Lyocell process” has been established as alternative to the viscose process, wherein cellulose, without forming a derivative, is dissolved in an organic solvent of an amine-oxide, in particular N-methylmorpholine-N-oxide (NMMO).
• NMMO N-methylmorpholine-N-oxide
• the solution of cellulose is usually extruded by means of a forming tool, whereby it is moulded. Via an air gap, the moulded solution gets into a precipitation bath, where the moulded body is obtained by precipitating the solution. The moulded body is washed and dried, optionally after further treatment steps.
• Cellulosic fibres produced from such solutions are called “solvent-spun” fibres and have received the generic name "Lyocell” by the BISFA (The International Bureau for the Standardisation of man made Fibres).
• a process for the production of Lyocell fibres is described, for instance, in US 4,246,221.
• the amine-oxide process yields fibres which are distinguished by a high tensile strength, a high wet-modulus and a high loop strength.
• Other possible solvents for the production of solvent-spun cellulosic fibres are so-called “ionic liquids”. These solvents are described e. g. in WO 03/029329 and WO 06/108861.
• solvents are described e. g. in WO 03/029329 and WO 06/108861.
• the expressions "solvent-spun cellulosic fibre” and "Lyocell” are used synonymously.
• Lyocell fibres are mainly used in the form of cut fibres of a discrete length, i.e. as so-called "staple fibres". If in the following "Lyocell fibres” are mentioned, Lyocell fibres in the form of staple fibres are meant by that.
• Lyocell fibre Yarns and threads from blends of cotton and Lyocell fibres with a Lyocell fibre content above 50 % are already available commercially.
• the Lyocell fibre is determining the properties like tenacity and elongation of the blend due to its high content.
• Cotton as a naturally product is available in qualities and with qualities which differ very much and the price depends on the quality. Yarns made of 100 % cotton show a high variation in the yarn parameters.
• the content of the Lyocell fibres in the blends of cotton and Lyocell fibres is less then 50 % (by weight) based on the total blend.
• the content of the Lyocell fibres in the yarns and threads according to the invention is 25 to 33 % by weight.
• the titer of the Lyocell fibres preferably is 0,9 to 2,5 dtex, particularly preferably 1 ,3 to 1 ,7 dtex.
• the cutting length of the Lyocell fibres is 28 to 51 mm, preferably 34 to 38 mm.
• the yarns and threads according to the invention can be produced according to any known manufacturing method. An overview can be found in "Alfons Hofer, Stoffe 1. 1st ed., Deutscher fraverlag GmbH, Frankfurt am Main, 1992)."
• the solvent spun cellulosic fibres are Lyocell fibres with a high NSF value. Especially preferred are Lyocell fibres with an NSF value of more than 200.
• the solvent spun cellulosic fibres with high NSF value are cross-linked with an alkali-resistant cross-linking agent, because the fibre blend according to the invention is preferably mixed with other cellulosic fibres and such fibres are commonly exposed to alkaline baths during dyeing and finishing. Therefore alkali-resistant cross-linking is preferred, but the acid- resistant cross-linked solvent spun cellulosic fibers in principal show the same advantages with respect to pilling performance and may be used especially for applications which require acidic steps during the aftertreatment.
• alkali-resistant cross-linking agent of the following formula (I):
• the dyeability of the solvent spun cellulosic fiber with an NSF value of more than 200 was compatible with that of cotton, which resulted in even dyeing results and increased dye-house economy.
• an acid-resistant cross-linking treatment which is already known from WO 94/09191.
• One preferred cross-linking agent in this embodiment of the invention is 1 ,3,5-triacryloylhexahydro-s-triazine (THAT)
• the solvent spun cellulosic fibres are cross-linked in the never dried state.
• Solvent-spun fibres in their state before the first drying are designated as "never dried” fibres. It has been shown that the use of compounds of the formula (I) on never dried fibres in particular produces a considerable reduction in the tendency to fibrillate.
• the cotton fibres are recycling cotton fibres, i. e. cotton fibres which were already processed once into textiles and then recycled by well-known methods.
• Such recycled cotton fibres have poor fibre properties because of the many mechanical as well as chemical influences they had experienced in their first "textile life" and during the recycling process. Therefore the fibre length could have been decreased by e.g. cutting, abrasion, breakage or even by the decomposing effect of chemicals (acids, bleaching agents, laundry chemicals, dyestuffs, oxygen, sunlight, etc.).
• chemicals ascids, bleaching agents, laundry chemicals, dyestuffs, oxygen, sunlight, etc.
• a further embodiment of the present invention is a product containing the yarns and threads according to the invention, preferably a textile article in the form of woven fabrics or knitted fabrics.
• textile articles essentially consisting of the yarns or threads according to the invention.
• a further embodiment of the present invention is a method to compensate the poor fibre properties of cotton fibres, wherein the cotton fibres with poor fibre properties are blended with less than 50 % by weight of Lyocell fibres, followed by making yarns or threads from this blend, the content of Lyocell fibres in the yarns or threads being less than 50 % by weight.
• Yarns were made by Ring-spinning from blends of different cotton-types and Lyocell fibres as described in Table 1.
• the improvements in the yarn-qualities as well as improvements in tenacity and elongation of the yarns given in % compared to a yarn (Ne 80/2) containing 100 % of the corresponding cotton type are shown in Table 1 :

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Artificial Filaments (AREA)

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Publications (1)

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• 2008
  • 2008-12-23 AT AT20072008A patent/AT507758A1/de not_active Application Discontinuation
• 2009
  • 2009-12-17 CN CN2009801524567A patent/CN102272365A/zh active Pending
  • 2009-12-17 WO PCT/AT2009/000490 patent/WO2010071910A2/en active Application Filing
  • 2009-12-17 EP EP09812413A patent/EP2382344A2/de not_active Withdrawn

Non-Patent Citations (2)

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