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
  • D02G3/44—Yarns or threads characterised by the purpose for which they are designed
  • D02G3/46—Sewing-cottons or the like
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
  • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
  • D01F6/78—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolycondensation products
  • D01F6/80—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolycondensation products from copolyamides
  • D01F6/805—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolycondensation products from copolyamides from aromatic copolyamides
• • 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
  • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
  • D02G1/16—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics using jets or streams of turbulent gases, e.g. air, steam
  • D02G1/165—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics using jets or streams of turbulent gases, e.g. air, steam characterised by the use of certain filaments or yarns
• • 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
  • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
  • D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
  • D10B2331/021—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides aromatic polyamides, e.g. aramides
• • 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
  • Y10S57/00—Textiles: spinning, twisting, and twining
  • Y10S57/903—Sewing threads
• • 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
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2913—Rod, strand, filament or fiber
  • Y10T428/2922—Nonlinear [e.g., crimped, coiled, etc.]
• • 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
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2913—Rod, strand, filament or fiber
  • Y10T428/2922—Nonlinear [e.g., crimped, coiled, etc.]
  • Y10T428/2924—Composite
• • 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
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2913—Rod, strand, filament or fiber
  • Y10T428/2933—Coated or with bond, impregnation or core
  • Y10T428/2964—Artificial fiber or filament
  • Y10T428/2967—Synthetic resin or polymer
  • Y10T428/2969—Polyamide, polyimide or polyester
• • 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
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2913—Rod, strand, filament or fiber
  • Y10T428/2973—Particular cross section
  • Y10T428/2976—Longitudinally varying

Definitions

• the present invention relates to new two-component loop yarns, adapted processes for their production and the use of these yarns as sewing and embroidery threads.
• loop threads made of so-called stand-up and effect threads have recently become known.
• Loop threads that can be used in particular as sewing threads are e.g. in EP-A-295,601, EP-A-367,938 and EP-A-363,798. These documents mainly describe loop yarns based on polyester yarns. The use of other polymers has been mentioned, but is not explained in more detail.
• Aromatic polyamides are known to be raw materials with high thermal and chemical stability and low flammability. Furthermore, fibers made from such raw materials show very good mechanical properties, such as high strength and high initial modulus (modulus of elasticity).
• Aromatic copolyamides have also become known which have good solubility in the known amide solvents, which are also easy to spin and whose filaments are distinguished by high strength values and initial moduli after stretching. Examples of such Aromatic copolyamides are described in DE-PS-2,556,883, DE-A-3,007,063, EP-A-199,090, EP-A-364,891, EP-A-364,892, EP-A-364,893 and EP-A-424,860.
• the present invention provides a loop yarn that takes advantage of the known good mechanical properties of the aramids.
• loop texturing yarns which are distinguished by particularly good sewing behavior and good seam formation can be produced by blowing texturing processes.
• the two-component loop yarns according to the invention can be used excellently as sewing and embroidery threads.
• the present invention relates to a two-component loop yarn made of upright and effect filaments, at least part of the upright component, preferably the entire upright component, consisting of aromatic polyamides, characterized in that the aromatic polyamides contain the recurring structural units of the formulas I and II -OC-Ar1-CO-NH-Ar2-NH- (I), -OC-Ar1-CO-NH-Ar3-NH- (II), wherein Ar1, Ar2 and Ar3 independently of one another represent a divalent mono- or polynuclear aromatic radical, the free valences of which are in the para-position or in the meta-position or in a parallel, coaxial or angled position comparable to these positions, and Ar2 and Ar3 in individual cases assume different meanings within the scope of the given definitions, and the respective monomer units on which the polymer is based are selected so that an aromatic polyamide which forms soluble in organic solvents and preferably forms isotropic solutions results.
• soluble aromatic polyamide is understood to mean an aromatic polyamide that has a solubility in N-methylpyrrolidone of at least 50 g / l at 25 ° C.
• the polar aprotic organic solvent contains at least one amide type solvent, e.g. N-methyl-2-pyrrolidone, N, N-dimethylacetamide, tetramethylurea, N-methyl-2-piperidone, N, N'-dimethylethyleneurea, N, N, N ', N'-tetramethylmaleic amide, N-methylcaprolactam, N-acetylpyrrolidine , N, N-diethylacetamide, N-ethyl-2-pyrrolidone, N, N'-dimethylpropionic acid amide, N, N-dimethylisobutylamide, N-methylformamide, N, N'-dimethylpropyleneurea.
• the preferred organic solvents for the process according to the invention are N-methyl-2-pyrrolidone, N, N-dimethylacetamide and a mixture of these compounds.
• radicals mean divalent aromatic radicals, the valence bonds of which are in para- or in a comparable coaxial or parallel position to one another, these are mono- or polynuclear aromatic hydrocarbon radicals or heterocyclic-aromatic radicals which can be mono- or polynuclear.
• heterocyclic-aromatic radicals these have in particular one or two oxygen, nitrogen or sulfur atoms in the aromatic nucleus.
• Polynuclear aromatic radicals can be condensed with one another or linearly connected to one another via C-C bonds or via -CO-NH groups.
• valence bonds which are in a coaxial or parallel position, are directed in opposite directions.
• An example of coaxial, oppositely directed bonds are the biphenyl-4,4'-ene bonds.
• An example of parallel, opposite bonds are the naphthalene 1,5 or 2,6 bonds, while the naphthalene 1,8 bonds are parallel aligned.
• Examples of preferred divalent aromatic radicals whose valence bonds are in para- or in a comparable coaxial or parallel position to one another are mononuclear aromatic radicals with mutually para-free valences, in particular 1,4-phenylene or dinuclear fused aromatic radicals with parallel directed bonds, in particular 1,4-, 1,5- and 2,6-naphthylene, or dinuclear aromatic residues linked via a CC bond with coaxial, oppositely directed bonds, in particular 4,4'-biphenylene.
• radicals mean divalent aromatic radicals whose valence bonds are in a meta or in a comparable angled position to one another, these are mono- or polynuclear aromatic hydrocarbon radicals or heterocyclic-aromatic radicals which can be mono- or polynuclear.
• heterocyclic-aromatic radicals these have in particular one or two oxygen, nitrogen or sulfur atoms in the aromatic nucleus.
• Polynuclear aromatic radicals can be condensed with one another or via C-C bonds or via bridging groups, e.g. -O-, -CH2-, -S-, -CO- or -SO2- be connected to each other.
• Examples of preferred divalent aromatic radicals whose valence bonds are in a meta or in a comparable angled position to one another are mononuclear aromatic radicals with free valences which are meta to one another, in particular 1,3-phenylene or dinuclear condensed aromatic radicals with bonds oriented at an angle to one another, in particular 1,6- and 2,7-naphthylene, or dinuclear aromatic residues linked via a CC bond with bonds oriented at an angle to one another, in particular 3,4'-biphenylene.
• Smaller proportions for example up to 5 mol% of the monomer units, based on the polymer, can be aliphatic or cycloaliphatic in nature, for example alkylene or cycloalkylene units.
• Alkylene radicals are to be understood as meaning branched and in particular straight-chain alkylene, for example alkylene with two to four carbon atoms, in particular ethylene.
• Cycloalkylene radicals are, for example, radicals having five to eight carbon atoms, in particular cycloalkylene.
• substituents are alkyl, alkoxy or halogen.
• Alkyl radicals are to be understood as meaning branched and in particular straight-chain alkyl, for example alkyl having one to six carbon atoms, in particular methyl.
• Alkoxy radicals are to be understood as meaning branched and in particular straight-chain alkoxy, for example alkoxy with one to six carbon atoms, in particular methoxy.
• radicals are halogen, it is, for example, fluorine, bromine or, in particular, chlorine.
• Aromatic polyamides based on unsubstituted radicals are preferably used.
• Terephthalic acid units are preferably used as the dicarboxylic acid unit in the aromatic polyamides containing the recurring structural units of the formulas I and II.
• stand-up filaments and preferably also effect filaments made of aromatic copolyamides which have the repeating structural units of the formulas III and IV or the formulas III and VI or the formulas III, IV and V or the formulas III, IV and VI or the formulas IV, V and VI included -OC-Ar1-CO-NH-Ar4-NH- (III), -OC-Ar1-CO-NH-Ar5-Q-Ar6-NH- (IV), -OC-Ar1-CO-NH-Ar7-Y-Ar8-NH- (V), wherein Ar1 and Ar4 independently of one another represent a divalent mono- or polynuclear aromatic radical, the free valences of which are in the para position or in a parallel or coaxial position to one another comparable to this position, in particular are mononuclear or dinuclear aromatic radicals, Ar5 and Ar6 independently represent a divalent mono- or polynuclear aromatic radical, the free valences of
• yarns containing as stand-up filaments and preferably also as effect filaments aromatic copolyamides with the recurring structural units of the formulas III, IV and V in which Ar1 is 1,4-phenylene, Ar4 1,4-phenylene or a divalent radical of 4,4 ' -Diaminobenzanilide, Ar5, Ar6 and Ar7 represent 1,4-phenylene, Ar8 represents 1,3-phenylene, Q is -O-1,4-phenylene-O- and Y is -O-; those aromatic copolyamides in which the proportions of the recurring structural units of the formulas III, IV and V are within the following ranges, based on the total amount of these structural units, are particularly preferably used: recurring structural unit of the formula III: 40-60 mol%, recurring structural unit of the formula IV: 1-20 mol%, and recurring structural unit of the formula V: 15-40 mol%
• Yarns are also particularly preferred, containing as stand-up filaments and preferably also as effect filaments, aromatic copolyamides with the recurring structural units of the formulas III, IV and V, in which Ar1 is 1,4-phenylene, Ar4 1,4-phenylene or a divalent radical of 4,4 'Is diaminobenzanilide, Ar5 and Ar6 are 1,4-phenylene, Ar7 and Ar8 are methyl-substituted 1,4-phenylene, Q is -O-1,4-phenylene-O- and Y is a direct CC bond; those aromatic copolyamides in which the proportions of the recurring structural units of the formulas III, IV and V vary within the following ranges, based on the total amount of these structural units, are particularly preferably used, move: recurring structural unit of the formula III: 10-30 mol%, recurring structural unit of the formula IV: 10-30 mol%, and recurring structural unit of the formula V: 10-60 mol%.
• Yarns are also particularly preferred, containing as stand-up filaments and preferably also as effect filaments, aromatic copolyamides with the recurring structural units of the formulas III, IV and V, in which Ar1 is 1,4-phenylene, Ar4 1,4-phenylene or a divalent radical of 4,4 'Is -diamino benzanilide, Ar5 and Ar darstellen are 1,4-phenylene, Ar7 and Ar8 are methyl-substituted 1,4-phenylene, Q is -O- and Y is a direct CC bond; those aromatic copolyamides in which the proportions of the recurring structural units of the formulas III, IV and V are within the following ranges, based on the total amount of these structural units, are particularly preferably used: recurring structural unit of the formula III: 10-30 mol%, recurring structural unit of the formula IV: 10-50 mol%, and recurring structural unit of the formula V: 10-60 mol%.
• Yarns are also particularly preferred, containing as stand-up filaments and preferably also as effect filaments, aromatic copolyamides with the recurring structural units of the formulas III and IV, in which Ar1 is 1,4-phenylene, Ar- 1,4-phenylene or a divalent radical of 4,4'- Is diaminobenzanilide, Ar5 is 1,4-phenylene, Ar6 is 1,3-phenylene and Q is -O-; those aromatic copolyamides in which the proportions of the recurring structural units of the formulas III and IV are within the following ranges, based on the total amount of these structural units, are particularly preferably used: recurring structural unit of the formula III: 20-50 mol%, and recurring structural unit of the formula IV: 40-60 mol%.
• Yarns are also particularly preferred which contain aromatic copolyamides as standing filaments and preferably also as effect filaments with the recurring structural units of the formulas III and VI, in which Ar1 is 1,4-phenylene, Ar4 1,4-phenylene or a divalent radical of 4,4'- Is diamino benzanilide and X is -NH-; those aromatic copolyamides in which the proportions of the recurring structural units of the formulas III and VI are within the following ranges, based on the total amount of these structural units, are particularly preferably used: recurring structural unit of the formula III: 20-70 mol%, and recurring structural unit of the formula VI: 20-70 mol%.
• yarns containing as stand-up filaments and preferably also as effect filaments aromatic copolyamides with the recurring structural units of the formulas III, IV and VI in which Ar1 is 1,4-phenylene, Ar4 1,4-phenylene or a divalent radical of 4,4 'Is -diamino benzanilide, Ar5 is 1,4-phenylene, Ar6 is 1,4- or 1,3-phenylene, Q is -O- or -O-1,4-phenylene-O- and X is -NH-; those aromatic copolyamides in which the proportions of the recurring structural units of the formulas III, IV and VI are within the following ranges, based on the total amount of these structural units, are particularly preferably used: recurring structural unit of the formula III: 10-30 mol%, recurring structural unit of the formula IV: 10-40 mol%, and recurring structural unit of the formula VI: 30-70 mol%.
• Yarns are also particularly preferred, containing as stand-up filaments and preferably also as effect filaments, aromatic copolyamides with the repeating structural units of the formulas IV, V and VI, in which Ar1 is 1,4-phenylene, Ar5 is 1,4-phenylene, Ar6 1,4- or Is 1,3-phenylene, QO- or -O-1,4-phenylene-O-, Ar7 and Ar8 is methyl-substituted 1,4-phenylene, Y is a direct CC bond and X is -NH-; there those aromatic copolyamides in which the proportions of the recurring structural units of the formulas IV, V and VI are within the following ranges, based on the total amount of these structural units, are particularly preferably used: recurring structural unit of the formula IV: 10-40 mol%, recurring structural unit of the formula V: 20-60 mol%, and recurring structural unit of the formula VI: 30-70 mol%.
• Examples of preferred diamine combinations which are based on these preferred aramids containing the recurring structural units of the formulas III and IV or the formulas III and VI or the formulas III, IV and V or the formulas III, IV and VI or the formulas IV, V and VI , are 1,4-phenylenediamine and 3,4'-diaminodiphenyl ether; 1,4-phenylenediamine, 4,4'-diaminodiphenylmethane and 3,3'-dichloro-, 3,3'-dimethyl or 3,3'-dimethoxybenzidine; as well as 1,4-phenylenediamine, 1,4-bis (aminophenoxy) benzene and 3,3'-dichloro-, 3,3'-dimethyl or 3,3'-dimethoxybenzidine; as well as 1,4-phenylenediamine, 3,4'-diaminodiphenyl ether and 3,3'-dichloro, 3,3'-dimethyl or
• Aramides which are derived from such diamine combinations and which can preferably be used according to the present invention are described in part in EP-A-199,090, EP-A-364,891, EP-A-364,892, EP-A-364,893 and EP- A-424,860.
• Two-component loop yarns are preferred which have a yarn count of 100 to 1000 dtex, in particular of 200 to 800 dtex.
• the two-component loop yarn according to the invention is composed of stand-up and effect filaments.
• the upright filaments are aligned to a much greater extent in the direction of the fiber axis than the effect filaments, which are interwoven and intertwined with the upright filaments, but additionally form loops due to their greater length and thus the textile properties and the usage properties, for example sewing behavior, significantly determine the yarn of the invention.
• Standard and effect filaments generally differ in terms of their individual titer. This can be 0.5 to 8 dtex for the upright filaments. For the effect filaments, this can be 0.2 to 4.5 dtex.
• the loop yarn according to the invention usually has a tenacity of more than 50 cN / tex, preferably more than 70 cN / tex.
• the tenacity is the quotient of the maximum tensile force and the final titer at the moment the maximum tensile force acts.
• the loop yarn according to the invention preferably has a maximum tensile force elongation of less than 5%, in particular less than 4%.
• the maximum tensile elongation is the stretch that the yarn experiences when the maximum tensile force is applied.
• Two-component loop yarns which have a tenacity of more than 50 cN / tex and a maximum tensile strength elongation of less than 5% are very particularly preferred.
• the effect component and part of the upright component of the two-component loop yarns according to the invention can in principle be made from all synthetic spinnable polymers and polycondensation products, such as Polyamides such as aliphatic, aromatic or aliphatic-aromatic polyamides; Polyacrylonitrile; Polyolefins such as polyethylene or polypropylene; Polyether ketones, such as PEK or PEEK; Polyarylene sulfides such as poly-para-phenylene sulfide; and polyesters such as polyethylene terephthalate.
• Polyamides such as aliphatic, aromatic or aliphatic-aromatic polyamides
• Polyacrylonitrile Polyolefins such as polyethylene or polypropylene
• Polyether ketones such as PEK or PEEK
• Polyarylene sulfides such as poly-para-phenylene sulfide
• polyesters such as polyethylene terephthalate.
• aromatic polyamides containing the recurring structural units of the formulas I and II defined above as the effect component of the yarns according to the invention; stand and effect components particularly preferably consist of one and the same material.
• the upper limit of the tenacity of the loop yarns according to the invention also depends on the selected degree of condensation of the aramid material used.
• the degree of condensation of the aramid is expressed in its solution viscosity.
• a high degree of condensation, i.e. a high solution viscosity leads to particularly high tenacity.
• the two-component loop yarn according to the invention consisting of stand-up and effect threads, is produced by blast texturing of two or more roving strands fed to a texturing nozzle with different lead.
• the blast texturing is carried out by a fluid, such as water, or in particular by a gas which is inert to the roving strands, in particular by air, which is optionally moistened or acts on a previously moistened roving.
• the filament material is fed to the blowing nozzle at a higher speed than is drawn from it.
• the yarn strands to be mixed with one another, which then deliver the stand or effect filaments in the finished yarn are fed to the texturing nozzle with different lead.
• the roving strand from which the upright filaments of the yarn according to the invention emerge is usually the blowing nozzle with a lead of 3 to 10%, the roving strand from which the effect filaments are made of the yarn according to the invention emerge, usually supplied with an advance of 10 to 60%.
• T S T St * (1 + (V ST / 100)) + T E * (1 + (V E / 100)), where T St and V St are the titer and lead of the roving and T E and V E are the titer and lead of the effect roving.
• roving strands of different total and single filament titer are used, at least the roving for the upright filament consisting of filaments of such a strength that the final strength of the loop yarn desired for the application area in question can be achieved.
• roving yarns are yarns which are located before the entry into the intermingling nozzle and are used as stand-up and effect components to build up the loop yarn.
• yarns made from aromatic polyamides containing the recurring structural units defined above are used as the main component of formulas I and II, which can be referred to as high-strength yarns, while both conventional textile multifilament yarns and high-strength multifilament yarns can be used as the effect component.
• feed materials can either already be presented to the texturing device as high-strength multifilament yarns or they can be stretched immediately before entering the texturing nozzle.
• Upright roving yarns are preferably used which have a maximum tensile force, based on the final titer, of at least 100 cN / tex, usually 100 to 250 cN / tex, in particular 125 to 170 cN / tex.
• roving rovings have a maximum tensile strength elongation of at most 5%, usually from 2 to 4%, preferably from 2.5 to 3.2%.
• two roving strands are used, both of which consist of filaments that have a tenacity, based on the final titer, of at least 150 cN / tex, and a maximum tensile strength elongation of 2 to 5%.
• the primary two-component loop yarn is drawn off under tension, so that the primary yarn is mechanically stabilized while reducing the loop size.
• the withdrawal tension is usually at least 0.1 cN / tex.
• the tension should preferably be selected so that the loops and loops formed are essentially retained, ie do not contract or only bud to a small extent.
• the stabilized primary yarn is optionally heated to fix the yarn structure. It is expedient to subject the yarn of constant length to hot air treatment at air temperatures of 200 to 600 ° C., preferably 350 to 450 ° C.
• the two-component loop yarns according to the invention have the advantages known for such yarns; the loops of the individual filaments remain fully intact after leaving the blast texturing nozzle and, thanks to the entrained air, result in good sewing properties even at high sewing speeds. This advantage is evident in the high values for the so-called sewing length to break, which are determined by the method known from DE-A-3,431,832. Furthermore, the two-component loop yarns according to the invention are distinguished by a particularly high strength.
• a particular advantage is that the two-component loop yarn according to the invention does not have to be twisted. It can be used untwisted, for example as a sewing thread.
• a desired twist to the yarn, for example a twist of approximately 100 to 300 T / m.
• the two-component loop yarns according to the invention can be used in particular as sewing threads.
• the invention also relates to this use of the yarns.
• a bobbin with stand roving titer 440 f 300 and a bobbin with effect roving titer 220 f 150 were placed on the creel. Both rovings consisted of an aromatic polyamide based on terephthalic acid, para-phenylenediamine, 1,4-bis (4-aminophenyl) benzene and 3,3'-dimethylbenzidine.
• the ratio of the transmission between the texturing nozzle and the downstream take-off unit was 2-15%, preferably 3-8%, for the vertical thread, and 10-50%, preferably 15-25%, for the effect thread.
• the temperatures of the intake and delivery godets were both 250 ° C.
• the drawn yarns were passed around the heated delivery godets.
• the yarn speed for the drafting systems was regulated separately.
• the single capillary titer of the rovings before entering the blow nozzle was 1.5 dtex, both for the stand-up and for the fancy yarn.
• the loop yarn was mechanically stabilized by pulling off, the tension in the yarn being 0.1 cN / tex.
• the yarn was then fixed by passing it through a hot air oven heated to 400 ° C. The subsequent fixation was carried out using a method which has been described in EP-A-569,082.
• a loop yarn was obtained with the following characteristics: Yarn titer: 644 dtex Maximum traction: 4570 cN Fineness: 71.0 cN / tex Maximum tensile strength stretch: 2.1% Loop strength: 54.61 cN / tex

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

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• 1994
  • 1994-12-07 DE DE4443456A patent/DE4443456A1/de not_active Withdrawn
• 1995
  • 1995-11-24 DE DE59506162T patent/DE59506162D1/de not_active Expired - Fee Related
  • 1995-11-24 EP EP95118506A patent/EP0718425B1/fr not_active Expired - Lifetime
  • 1995-12-05 US US08/567,289 patent/US5645935A/en not_active Expired - Fee Related

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