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
  • 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
  • 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
• • 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
  • D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]

Definitions

• EP 0 367 938 B describes a two-component yarn which has at least one multifilament first yarn component, which is arranged in the interior of the yarn and which is referred to as the core material, and at least one second multifilament effect material enveloping the core material.
• the two aforementioned multifilament yarns are intermingled with one another in such a way that the necessary thread closure is achieved by intertwining the two yarn materials results.
• such a filament yarn is used as the first yarn material, the specific strength of which is already very high as a starting material compared to a standard textile yarn.
• EP 0367 938 B thus teaches that a high-strength multifilament yarn is already used as the starting material.
• fiber yarns or twists are also known.
• Core yarns are also known, as described for example in DE 24 36 997 B.
• the known yarn has a multifilament core material, which is wound with a second yarn component to form a core yarn.
• the core material of the well-known core yarn consists of stretched and fixed multifilament fibers, the high-strength multifilament yarns previously described for the intermingled yarn usually also being used for this. These high-strength multifilament yarns are considerably more expensive than standard textile fibers.
• EP 0 363 798 A A yarn with the features of the preamble of claim 1 is known from EP 0 363 798 A.
• This publication describes a sewing thread which is formed from multifilament thread components, the specific strength of the known sewing thread being greater than 40 cN / tex.
• the known sewing thread has the construction of a loop sewing thread, this construction also being commonly referred to as air-entangled thread. Because of this construction, the known sewing thread has a relatively open, voluminous structure, this structure being achieved by the fact that the effect yarn component used to produce the loop sewing thread protrudes loop-like or loop-shaped over the fiber yarn axis of the soul component relative to the largely parallel soul component.
• EP 0 363 798 A expressly emphasizes that high-strength yarns, which are also commonly referred to as technical yarns, are used to produce this known loop sewing thread.
• the present invention has for its object to provide a yarn of the type specified, which has an extremely high resistance to mechanical stresses at a particularly low manufacturing price.
• the yarn according to the invention in particular a sewing thread according to the invention, has a specific strength between 32 cN / tex and 55 cN / tex, the yarn according to the invention being formed from multifilament yarn components like the known yarn described above.
• the yarn according to the invention comprises at least two, preferably two to four, twisted core yarns, each core yarn having at least one multifilament yarn component forming the core of the core yarn and at least one second yarn component.
• the core of each core yarn is spun by the at least one second yarn component to form the core yarn, the core of each core yarn forming at least one multifilament yarn component being a standard textile standard multifilament yarn.
• the yarn according to the invention which comprises at least two, preferably two to four, twisted core yarns has a number of advantages. It was thus surprisingly found that such a yarn has the previously stated high strengths between 32 cN / tex and 55 cN / tex, in particular between 37 cN / tex and 48 cN / tex, although soul materials are used to produce this yarn in deviation from the prior art described above, they are not high-strength multifilament yarns but standard textile standard multifilament yarns. This in turn leads to the yarn according to the invention being particularly inexpensive to produce.
• the yarn according to the invention is used as a sewing thread, such a sewing thread is characterized in that it performs the usual sewing operations, for example multidirectional sewing or buttonhole sewing, even at extremely high sewing speeds of up to 7,000 stitches per minute without one Damage to the yarn survives.
• the yarn according to the invention does not cause any sewing disturbances in the area of the ready-to-wear.
• a first embodiment of the yarn according to the invention has core yarns in which the multifilament yarn components forming the core have an intrinsic viscosity between 0.5 dl / g and 0.75 dl / g, in particular an intrinsic viscosity between 0.55 dl / g and 0.63 dl / g.
• These are multifilament polyester yarn components.
• the values of the intrinsic viscosity mentioned above reflect the molecular structure (molecular weight, chemical composition) of the polyester multifilament yarns used, the degree of condensation of the polymers also correspondingly increasing with increasing viscosity.
• the values given above refer to polymer solutions in dichloroacetic acid at 25 ° C.
• this single-filament titer varies between 0.6 dtex and 6 dtex, preferably between 1.5 dtex and 4 dtex.
• the core yarns according to the invention provided in the yarn according to the invention in particular have a multifilament yarn (multifilament yarn component) as a core, the number of filaments of which varies between 16 and 300, preferably between 24 and 96.
• a fiber yarn made of polyamide 6, polyamide 6,6, cotton and / or in particular polyester fibers is preferably used as the second yarn component of each core yarn.
• Embodiments of the yarn according to the invention have a particularly high strength in which the second yarn component of each core yarn comprises at least one fiber yarn, the specific strength of which varies between 40 cN / tex and 70 cN / tex.
• the yarn according to the invention has a fiber yarn for each core yarn as the second yarn component, the staple length of the individual fibers of the fiber yarn varies between 15 mm and 120 mm, in particular between 20 mm and 60 mm.
• the yarn according to the invention comprises at least two, preferably two to four, twisted core yarns, each individual core yarn having the structure described above or below.
• Nm means the thread count (titer), given in number metric.
• Such a twisted yarn which, as already described above, comprises at least two, preferably two to four, twisted core yarns, can in particular also be used excellently as a sewing thread, since such a sewing thread, for example, multidirectional sewing or sewing buttonholes with high stitch densities (up to 7,000 stitches per minute) without yarn break.
• Each core yarn forming the yarn according to the invention described above has a total denier which is between 100 dtex and 1,400 dtex, preferably between 100 dtex and 600 dtex.
• the mass ratio of core to second yarn component provided for each core yarn varies in the yarn according to the invention from 70% (mass of core) to 30% (mass of second yarn component) to 30% (mass of core) to 70% (mass of second yarn component) .
• the yarn according to the invention In order to ensure simple dyeing with a dye class of core material and at the same time the second yarn component, it is recommended that the yarn according to the invention have the same fiber substrate mentioned above both as core and as a second yarn component.
• the invention Yarn includes core yarn that have different fiber substrates in the core and as a second yarn component.
• the present invention is also based on the object of providing a production method with which the yarn according to the invention described above can be spun particularly economically.
• core yarns are provided with core yarns which have at least one multifilament yarn component serving as a core, which is wound with a second yarn component, the at least one multifilament yarn component forming the core of each core yarn being a pre-oriented multifilament yarn (POY thread) is selected.
• POY thread pre-oriented multifilament yarn
• the molecular structure of this pre-oriented multifilament yarn corresponds to that of a standard textile multifilament yarn, the pre-oriented multifilament yarn (POY yarn) being stretched such that its strength is between 60 cN / tex and 90 cN / tex, preferably between 71 cN / tex and 90 cN / tex , varies.
• the method according to the invention has a number of advantages.
• a thread or sewing thread produced in this way has low residual shrinkage values, which, for example, are in the order of 1%, preferably less than 0.5%, in hot shrinkage values (water, about 98 ° C.) and in hot air shrinkage values (160 ° C.) on the order of about 2%, preferably less than 1%.
• a polyester multifilament yarn is preferably selected for this, the intrinsic viscosity of which is between 0.5 dl / g and 0.75 dl / g, preferably between 0.55 dl / g and 0.63 dl / g.
• the polyester POY yarn described above is such a yarn whose chemical structure and in particular its molecular weight corresponds to a conventional textile standard multifilament yarn.
• the intrinsic viscosities mentioned above represent values which are measured in corresponding solutions of the polymer in dichloroacetic acid at 25 ° C.
• each pre-oriented multifilament yarn which is preferably polyester-POY yarn
• each pre-oriented multifilament yarn is drawn in such a way that this multifilament yarn is stretched over feeds a delivery godet wrapped in the yarn at a first speed to a main stretching zone.
• the multifilament yarn is then withdrawn from the main drawing zone at a second speed via a take-off godet wrapped in the pre-oriented multifilament yarn, the second speed being 70% to 180%, preferably 100% to 160%, greater than the first speed.
• the take-off godet is heated to a temperature between 160 ° C. and 240 ° C.
• the tensile strengths of a multifilament yarn stretched in this way are extremely high, that is, depending on the pre-oriented multifilament yarn (POY yarn) used in each case, they are in the range between 60 cN / tex and 90 cN / tex, in particular between 71 cN / tex and 90 cN / tex .
• a further development of the previously described embodiment variant of the method according to the invention provides that the delivery godet is also heated to a temperature between 60 ° C. and 160 ° C., preferably to a temperature between 80 ° C. and 140 ° C. heats up.
• heating is carried out in the main stretching zone, i.e. between the delivery godet and the take-off godet, the pre-oriented multifilament yarn to a temperature between 80 ° C and 180 ° C.
• This heating of the multifilament yarn in the main stretching zone is preferably carried out in such a way that a hot plate, an IR emitter and / or a laser are used for this purpose.
• this residence time varies in particular between 0.01 s and 1 s.
• the delivery godet and the take-off godet are looped with the pre-oriented multifilament yarn, as already described above. It has been shown here that particularly high strengths and particularly low shrinkage values of the stretched multifilament yarn result when the delivery godet and / or the take-off godet are looped 5 to 40 times, preferably 10 to 20 times, with the pre-oriented multifilament yarn.
• These wrapping values refer to Godets, the diameter of which vary between approximately 40 mm and 250 mm, preferably 80 mm and 120 mm.
• a pre-stretching zone is arranged in front of the main stretching zone, as seen in the transport direction of the pre-oriented multifilament yarn (POY yarn).
• POY yarn which is preferably a polyester POY yarn, is first partially drawn in the pre-drawing zone and then finally drawn in the main drawing zone.
• pre-stretch the pre-oriented multifilament yarn in the pre-stretching zone between 0.5% and 10%, preferably between 1% and 4%.
• the pre-oriented multifilament yarn is thus stretched in the pre-stretching zone between 0.5% and 10%, preferably between 1% and 4%.
• pre-stretching or stretching speeds it should be noted that the aforementioned high strengths and low shrinkage values can be achieved particularly economically and reproducibly if one selects take-off speeds that are greater than 300 m / min and preferably between 600 m / min and 1,200 m / min.
• a relaxation zone is arranged behind the main drawing zone, in which the drawn multifilament yarn is heated to a temperature between 80 ° C and 240 ° C, preferably to a temperature between 140 ° C and 200 ° C, is heated. It has been shown here that such a relaxation zone further reduces the shrinkage values, in particular the boiling shrinkage value (water 98 ° C.) and the hot air shrinkage value (160 ° C.) of the drawn multifilament yarn. This is particularly true when the drawn multifilament yarn is introduced into the relaxation zone with lead, which is preferably between 0.5% and 10% and in particular between 1% and 3%.
• the residence time of the multifilament yarn in the relaxation zone then varies depending on the respective transport speed of the yarn through the relaxation zone and is preferably 0.01 s to 1 s.
• POY yarns used in the method according to the invention depends on the later use of the drawn yarn. POY multifilament yarns are preferably selected here whose single filament titer varies between 1 dtex and 12 dtex, preferably between 3 dtex and 8 dtex.
• the titer of the pre-oriented multifilament yarn it should be noted that this varies between 40 dtex and 2,000 dtex, preferably between 80 dtex and 1,200 dtex.
• the number of filaments of the pre-oriented multifilament yarn used is between 16 and 300, preferably between 24 and 96.
• a variant of the previously described embodiment of the method according to the invention provides that first each core yarn is individually twisted and then the core yarns present as pre-twist are twisted to form the yarn according to the invention.
• a yarn twist is preferably selected, the twist coefficient ⁇ is between 90 and 140, the twist coefficient ⁇ being defined above for the yarn according to the invention.
• the subsequent twist of twist is preferably carried out at a twist factor ⁇ between 120 and 180.
• One embodiment of the yarn according to the invention has particularly good results in terms of sewing behavior, its hairiness (sh) between 2.5 and 7.5, in particular varies between 4 and 7. These hairiness values relate to measurement results as determined by the known method with a Uster yarn uniformity measuring device, type UT3.
• the method according to the invention preferably uses a multifilament polyester core and a polyester spinning component as the starting material (second yarn component), so that a core yarn is accordingly obtained which consists entirely of polyester.
• Polyester in the sense of the present application is understood to mean polyethylene terephthalate.
• a polyester POY yarn was pre-stretched between a delivery plant and a downstream delivery godet in such a way that it was 5% elongated.
• the temperature of the delivery godet was 100 ° C.
• the pre-drawn multifilament yarn was then drawn in a main section, which consisted exclusively of the aforementioned delivery godet and a take-off godet, at a draw ratio of 1: 2.4.
• the temperature of the take-off godet was 160 ° C.
• the polyester multifilament yarn was 20 times the supply godet and 20 times the Deduction godet wound. Both godets had a diameter of 150 mm.
• the drawing speed was 600 m / min.
• a thermal treatment (hot plate) was provided behind the take-off godet, the drawn multifilament yarn being introduced into the thermal aftertreatment with a lead of 3%.
• the temperature of the thermal aftertreatment was 180 ° C., the residence time was 0.5 s.
• the drawn polyester multifilament yarn which had a total denier of 138 dtex and a filament number of 30, was wound up.
• the stretched polyester multifilament yarn described above was wound with a polyester staple fiber (single fiber titer 1.3 dtex, staple length 38 mm) to form a core yarn.
• the spun core yarn had a twist factor ⁇ of 105.7 and a titer of Nm 49.

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

Applications Claiming Priority (2)

Publications (2)

Family

ID=6458427

Family Applications (1)

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• 1992
  • 1992-05-12 DE DE4215212A patent/DE4215212A1/de not_active Withdrawn
• 1993
  • 1993-05-08 ES ES93107497T patent/ES2093875T3/es not_active Expired - Lifetime
  • 1993-05-08 AT AT93107497T patent/ATE144801T1/de not_active IP Right Cessation
  • 1993-05-08 EP EP93107497A patent/EP0569891B1/de not_active Expired - Lifetime
  • 1993-05-08 DE DE59304337T patent/DE59304337D1/de not_active Expired - Fee Related
• 1997
  • 1997-05-08 HK HK61397A patent/HK61397A/xx not_active IP Right Cessation

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