Classifications

• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
  • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
  • D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
  • D06M11/36—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
  • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
  • D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
  • D06M11/36—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
  • D06M11/38—Oxides or hydroxides of elements of Groups 1 or 11 of the Periodic Table
  • D06M11/40—Oxides or hydroxides of elements of Groups 1 or 11 of the Periodic Table combined with, or in absence of, mechanical tension, e.g. slack mercerising
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S8/00—Bleaching and dyeing; fluid treatment and chemical modification of textiles and fibers
  • Y10S8/03—Swelling and stretching

Definitions

• Cotton fibres or rovings or slivers are subjected to the action of a swelling agent without tension being exerted on them.
• the swelling agent should be capable of transforming the material into cellulose II.
• the fibres shrink while still in the presence of the swelling agent and subsequently the fibres are restretched to 95-110% of their original length before swelling. flhen while maintaining these dimensions the fibres or rovings or slivers are rinsed or neutralised and rinsed and while still maintaining these dimensions are dried at temperatures exceeding 70 C.
• the fibres or slivers or rovings can be given a resin finish and they will not show the usual degradation of properties.
• the invention concerns a method of preparing cotton fibres, slivers, or rovings which is based upon the application of definite swelling, stretching, rinsing, and drying treatments on fibres, slivers and rovings.
• the fibres obtained have a distinctly higher strength and 'an improved response to subsequent easy-care finishing.
• the increase in fibre strength may amount to about 200% of the original strength.
• the invention comprises the steps of swelling the cotton fibre or sliver or roving without tension in a swelling agent so as to obtain cellulose II as e.g.: caustic soda with a concentration of at least 512% NaOH, or preferably higher, e.g. 25% NaOH.
• cellulose II as e.g.: caustic soda with a concentration of at least 512% NaOH, or preferably higher, e.g. 25% NaOH.
• cellulose II as e.g.: caustic soda with a concentration of at least 512% NaOH, or preferably higher, e.g. 25% NaOH.
• the material is dried while maintaining the dimensions reached.
• the fibres or slivers or rovings obtained in this way are spun either in the wet or the dry state into weaving or knitting yarns.
• Treating yarns by using the technique described is not recommended, because an essential change in the yarn structure involving a very low elongation of the yarn will occur.
• a reactant finishing process using the treated fibrous materials does not lead, or does so only to a small extent, a decrease of the strength properties of the fibres and yarns respectively of the fabrics and 'knittings prepared from these fibres and yarns.
• the shinkage occurring during swelling may be about IS- 20%.
• the restrec'tching of the fibre or the sliver or the roving may be carried out by a conventional method, e.g. by stretching between two pairs of rollers, the second pair of which has a higher speed than the first pair. :In some cases use can be made of two clamps holding the yarn by enlarging the distance between them.
• the restrectching treatment should preferably start when the material is still completely swollen, as only then are the necessary high stretching levels easily obtained using relatively low loads at that time.
• the caustic soda should preferably be removed completely before the final drying treatment.
• the rinsing treatment may be repeated after drying.
• the drying treatment should be carried out in such a way that at least the final length reached during swelling and rinsing is maintained.
• imperfections caused during swelling as a consequence e.g. of an imperfect penetration of the caustic soda into the material, may be nearly completely eliminated by using a high degree of restretching during the drying treatment.
• even fibres which are stretched insufiiciently show an essential improvement of the tensile properties if restretching is applied to as high a degree as possible.
• drying treatment contributes quite essentially to the elfect which is desired.
• drying should lead to a setting of the structural changes introduced into the fibres by applying the treatments mentioned above.
• the moisture should be removed as much as possible without damaging the fibre material thermally. Based upon experiments carried out, drying by means of infrared radiation meets the above-mentioned requirement.
• EXAMPLE I Fibre treatments A bundle of cotton fibres was swollen without tension in 24% NaOH. After complete swelling the fibres were 3 restrectched to between 100% and 105% of the original length. Restretching was carried out during swelling and rinsing of the caustic soda. Their final dimensions reached during restretching were maintained for "at least one minute.
• the conditioned material was finished using a reapparatus.
• the wet material was spun twistless. In order to obtain the best normal yarn possible, the twistless material was uptwisted in the moist state.
• an unmercerised roving was spun in the same way and uptwisted. In this way a 27 tex. yarn was made applying a twist of 700 turns per metre.
• the reactant solution was applied in a quantity equal to the weight of the fibres. After storage for one hour at room temperature and 100% relative humidity, the fibres were dried at 70 C. and then baked for 5 min. at 160 C.
• the treated material shows a clearly greater strength when the reactant has been applied. Generally speaking the total elongation does not show large differences. The tearing strength of the reactant treated preswollen material is better and this tendency is more pronounced with an increasing reactant content.
• the dry crease recovery angle of the preswollen material without reactant is somewhat higher than that of the blank material. When the reactant has been applied the differences disappear.
• the wet recovery angles are nearly the same for blank and treated material.
• swelling the unrestrained material in a swelling agent to effect a transformation of the material to Cellulose II; stretching the material, in the presence of the swelling agent, to a length within 95 to 110 percent of the original length of the material before the soaking step, the stretched length being continuously maintained during the remaining steps in the process; rinsing the material while in the stretched condition to remove the swelling agent; and drying the material while in the stretched condition at a temperature in excess of 70 C. to set the improved tensile strength properties obtained.
• the swelling agent is an aqueous solution of sodium hydroxide with a strength of 12-24% NaOH.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Chemical Or Physical Treatment Of Fibers (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

Priority Applications (1)

Applications Claiming Priority (1)

Publications (1)

Family

ID=9787520

Family Applications (1)

Country Status (5)

Cited By (2)

• 1971
  • 1971-02-19 GB GB498271A patent/GB1366642A/en not_active Expired
• 1972
  • 1972-01-24 NL NL7200929A patent/NL7200929A/xx unknown
  • 1972-01-28 US US00221762A patent/US3822994A/en not_active Expired - Lifetime
  • 1972-02-08 FR FR7204119A patent/FR2125330B1/fr not_active Expired
  • 1972-02-17 DE DE19722207398 patent/DE2207398B2/de active Granted

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