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
  • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
  • D02G1/20—Combinations of two or more of the above-mentioned operations or devices; After-treatments for fixing crimp or curl
  • D02G1/205—After-treatments for fixing crimp or curl
• • 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
• • 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
• • 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
  • Y10T428/2929—Bicomponent, conjugate, composite or collateral fibers or filaments [i.e., coextruded sheath-core or side-by-side type]
• • 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 a two-component loop sewing thread for modern industrial sewing machines with high strength and low shrinkage and a method for its production.
• a similar loop sewing thread is known for example from EP-A 57 583.
• several, differently shrinking yarns are fanned by air-jet texturing with different lead and thus a loop yarn is produced.
• the shrinkage is triggered in a subsequent fixing process, the loops of the filaments are then tightened into bud-like projections.
• the yarns are provided with a twist of about 100 to 300 T / m between loop formation and fixation.
• a disadvantage of these known methods is that the final strength of the finished loop yarn is lower than would be expected from the strength of the rovings.
• the final strength of these known sewing threads is only between 25 and 40 cN / tex, whereby final strength here means the quotient of the maximum tensile force and the final titer at the moment of tearing.
• the filaments of these known yarns can also shrink to different degrees depending on the degree of integration. These differences can be seen in a different coloration along a filament and are particularly pronounced from filament to filament if yarns with different shrinking capacities have been used.
• Single-component loop sewing threads are already known, the final strength of which is between 40 and 50 cN / tex. But these yarns show bad sewing properties due to their low number of loops. Like conventional sewing threads, they are provided with around 600 to 800 T / m and their elongation at break is relatively high at over 18%.
• the present invention relates to a two-component loop sewing thread which does not have the disadvantages of the prior art described above.
• synthetic polymers such as. B. polyamides, polyacrylonitrile, polypropylene, but preferably polyesters and in particular polyethylene terephthalate and has a final strength, i. H.
• the final strength is understood to be the quotient of maximum tensile force and final titer at the moment of tearing; the maximum tensile elongation is Elongation experienced by the yarn when subjected to the maximum tensile force.
• the total titer of the two-component loop sewing thread according to the invention is generally 200 to 900 dtex. Underneath and overlying titers can also be produced if they are of interest in the individual application, but they are not the rule.
• the two-component loop sewing thread according to the invention is composed of stand-up filaments and effect filaments.
• the upright filaments are oriented 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 protruding from the fiber structure due to their greater length, and thus the textile and usage properties of the yarn according to the invention are essential participate.
• the total titers of upright filaments and effect filaments of the loop sewing thread according to the invention are in a ratio of 95: 5 to 70:30, preferably 90:10 to 80:20.
• Stand-up filaments and effect filaments differ in terms of their individual titer. This is 8 to 1.2, preferably 5 to 1.5 dtex for the standing filaments, and 4.5 to 1, preferably 3 to 1.4 dtex for the effect filaments. Within these titer limits, the single titer of the standing filaments is 1.2 to 6 times, in particular 1.5 to 3.5 times, the single titer of the effect filaments.
• the two-component loop sewing threads according to the invention can be produced from the above-mentioned synthetic spinnable polymers and polycondensation products, such as polyamides, polyacrylonitrile, polypropylene and polyesters.
• polyesters as starting material for the production of the yarns according to the invention is particularly expedient.
• Suitable polyesters are in particular those which essentially consist of aromatic dicarboxylic acids, such as, for. B. terephthalic acid or isophthalic acid, 1,4-, 1,5- or 2,6-naphthalenedicarboxylic acid, hydroxycarboxylic acids such as. B.
• polyester raw materials can also by condensing smaller proportions of aliphatic dicarboxylic acids such as. B. glutaric acid, adipic acid or sebacic acid or of polyglycols such as. B.
• Another possible modification which in particular influences the dyeing behavior of the two-component loop sewing threads according to the invention, is the modification by building blocks containing sulfo groups, such as, for. B. by the incorporation of sulfoisophthalic acid.
• the upper limit of the final strength of the loop sewing threads according to the invention depends on the selected degree of condensation of the polymer material used, in particular the polyester material.
• the degree of condensation of the polyester is expressed in its viscosity.
• a high degree of condensation, i.e. H. a high viscosity leads to particularly high final strengths of the yarns produced according to the invention.
• High-molecular-weight polyesters with an intrinsic viscosity (IV) of more than 0.65 dl / g, in particular more than 0.75 dl / g, are therefore preferred for the production of the loop sewing threads according to the invention, these values being measured in solutions in dichloroacetic acid (DCE) at 25 ° C.
• Loop sewing threads with the property profile defined above and based on polyesters with IV values above 0.65 dl / g are the subject of EP-B 363 798 and excluded from the subject of the present application.
• a preferred polyester material for producing the loop yarns according to the invention is polyethylene terephthalate.
• the inventive production of the two-component loop sewing thread is carried out by air nozzle texturing two roving strands fed with different lead, these roving strands have different total and individual titers, but both consist of high-strength, low-shrinkage and low-stretch filaments.
• High-strength, low-shrinkage and low-stretch filaments are understood to mean those which have a maximum tensile strength, based on the final titer, of at least 65 cN / tex, generally 65 to 90 cN / tex, preferably 70 to 84 cN / tex, a maximum tensile strength Elongation of at least 8%, usually 8 to 15%, preferably 8.5 to 12%, and a thermal shrinkage at 180 ° C. of at most 9%, usually 5 to 9%, preferably 6 to 8% .
• the filament material is fed to the blow nozzle at a higher speed than is drawn from it.
• the two strands of yarn to be mixed which then deliver the stand or the 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 fed to the blowing nozzle with a lead of 3 to 10%, the roving strand, from which the effect filaments of the yarn according to the invention emerge, with a lead of 10 to 60%.
• the total titers of the roving strands forming the upright filaments and the effect filaments are selected so that they have a ratio of 95: 5 to 70:30, preferably 90: 10 to 80:20, and that their mixture after the interlacing is 200 to 900 dtex.
• the total titer T S of the intermingled yarn is not simply composed of the titers of the roving, but that the leading of the two roving must be taken into account here.
• the individual titer of the filament of the roving is 8 to 1.2, preferably 5 to 1.5 dtex, the individual titer of the filament of the effect roving is 4.5 to 1, preferably 3 to 1.4 dtex.
• the individual titer of the rovings is selected so that the individual titer of the upright filaments is 1.2 to 6 times, preferably 1.5 to 3.5 times, the individual titer of the effect filaments.
• the high-strength and low-shrinkage threads can be used, which, for. B. from DE-AS 12 88 734 or EP-A 173 200 are known and their production is described there.
• the production of the rovings required for the process according to the invention in an integrated process step immediately preceding the air turbulence, in which they are obtained by stretching a partially oriented spun fabric and an immediately subsequent, essentially shrink-free heat treatment is the subject of EP-B 363 798 and of the subject of present registration excluded.
• partially oriented yarns are drawn at a temperature of 70 to 100 ° C., preferably via heated godets at a Drawing tension in the range from 10 to 25 cN / tex, preferably from 12 to 17 cN / tex (in each case based on the drawn titer).
• the essentially shrink-free heat treatment of the yarns immediately after stretching takes place at a yarn tension between 2 and 20 cN / tex, preferably at 4 to 17 cN / tex, and a temperature in the range from 180 to 250 ° C., preferably from 225 to 235 ° C.
• this heat treatment can be carried out in any known manner; it is particularly expedient to carry out the heat treatment directly on a heated extraction godet.
• Substantially shrink-free means that the yarns are preferably kept at a constant length during the heat treatment, but that shrinkage of up to 4%, better not more than 2%, can be permitted.
• the drawing conditions of the two partially oriented yarns are preferably kept as identical as possible. However, differences in the drawing conditions of up to ⁇ 10% can be tolerated.
• the loop yarn withdrawn from the air texturing nozzle can still be subjected to a fixing process.
• This fixation can also be carried out in any manner known per se, it is expedient to subject the yarn of constant length to hot air treatment at temperatures of 200 to 320 ° C., preferably 240 to 300 ° C.
• the loops of the individual filaments remain fully intact 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 up to the break, which according to that from DE-A-34 31 832 known methods can be determined.
• the uniformly stretched filaments lead to uniform coloring and thus to a calm image of the seam.
• the strength of the yarns produced in this way is significantly higher than that of sewing threads with differently shrinking filaments.
• the use of similar rovings also simplifies the manufacturing process.
• shrinking rovings for example, much more loops must first be produced than the finished sewing thread should have, since the shrinking process leads to a reduction in the number of loops.
• the two-component loop sewing thread according to the invention does not have to be twisted during its manufacture. It is therefore untwisted and can also be used untwisted as a sewing thread. Usually, however, is subsequently in the course of further processing, eg. B. for optical reasons, a relatively weak rotation of about 100 to 300 T / m applied.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Sewing Machines And Sewing (AREA)
• Artificial Filaments (AREA)
• Materials For Medical Uses (AREA)

Applications Claiming Priority (3)

Related Parent Applications (2)

Publications (3)

Family

ID=6364594

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Family Cites Families (21)

• 1988
  • 1988-10-07 DE DE3834139A patent/DE3834139A1/de not_active Withdrawn
• 1989
  • 1989-10-04 AT AT92118877T patent/ATE142718T1/de not_active IP Right Cessation
  • 1989-10-04 DE DE58909729T patent/DE58909729D1/de not_active Expired - Fee Related
  • 1989-10-04 EP EP92118877A patent/EP0530860B1/fr not_active Expired - Lifetime
  • 1989-10-04 SG SG9608527A patent/SG83079A1/en unknown
  • 1989-10-04 EP EP89118385A patent/EP0363798B1/fr not_active Expired - Lifetime
  • 1989-10-04 DE DE8989118385T patent/DE58905247D1/de not_active Expired - Fee Related
  • 1989-10-04 AT AT89118385T patent/ATE92981T1/de not_active IP Right Cessation
  • 1989-10-06 US US07/417,904 patent/US5100729A/en not_active Expired - Fee Related
  • 1989-10-06 JP JP1260382A patent/JPH02145828A/ja active Pending
• 1993
  • 1993-12-03 US US08/161,980 patent/US5359759A/en not_active Expired - Fee Related

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