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
  • 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
  • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
  • D02G3/38—Threads in which fibres, filaments, or yarns are wound with other yarns or filaments, e.g. wrap yarns, i.e. strands of filaments or staple fibres are wrapped by a helically wound binder yarn

Definitions

• the present invention relates to a sewing thread with the features the preamble of claim 1 and a method to produce such a sewing thread with Features of the preamble of claim 19.
• Sewing threads are known in different constructions, be it as sewing thread, as air-entangled yarns or as core yarns, each of the constructions listed above being theirs has individual advantages or weaknesses.
• Sewing threads designed as core threads have at least two rovings, these at least two, as core yarns trained rovings by twisting to manufacture Sewing thread are processed.
• Each of these rovings has the construction of a core yarn, such that each roving at least one core from a first multifilament yarn component comprises, this soul then with a second Fiber yarn component is wound.
• a roving a core-shell structure wherein the core through the inner multifilament soul that follows is also referred to as the first yarn component, and the Coat through a fiber yarn that spins the soul and that hereinafter also as the second yarn component or as the second Fiber yarn component is designated, is formed.
• the first multifilament yarn component to cover this first multifilament yarn component which is a major part of the strength of the finished Sewing thread provides, from unwanted damage
• the experts held it up today necessary for such a covering with fiber yarn must be so dense that the one made from two rovings Sewing thread seen at least in the cross section of the sewing thread about 45 individual fibers per roving, as a rule, however between 50 and 88 individual fibers per roving.
• the present invention is based on the object To provide sewing thread of the specified type that the Has construction of a core yarn and the cheaper than can be produced so far.
• the sewing thread according to the invention also exists as before known sewing thread described from at least two rovings, which twists together to form the sewing thread are.
• Each roving has the construction of a core yarn on, this core yarn at least one that Soul-forming first multifilament yarn component and a die Soul-spinning second fiber yarn component comprises.
• the finished sewing thread seen in the inventive Sewing thread at least the fiber thread wound a roving up to 41 individual fibers, preferably less than 41 individual fibers, so that in comparison to the prior art described above, the invention Sewing thread a much smaller number of fiber threads in the fiber yarn covering forming the sheath of the rovings owns.
• the invention differs Sewing thread from conventional sewing thread in that that the sewing thread according to the invention has at least one roving, in which the fiber yarn spinning is decidedly less Has individual fibers than in the prior art Case is.
• the improved sewing behavior of the sewing thread according to the invention which is up to 15% higher Sewing speeds or up to 20% longer seams with multidirectional Sewing and a higher number of with the Sewing thread according to the invention created buttonholes without thread break expresses, it is attributed to that in the invention Sewing thread provided fiber yarn covering of the roving with a maximum of 41 individual fibers or preferably less (seen across the cross section of the finished sewing thread) on the one hand the multifilament soul of each roving is still sufficient from mechanical and / or thermal damage protects and on the other hand due to the reduced number of individual fibers increased structuring in the wrapping has, so that even more air through such a reference the individual fiber count entrains reduced rewound, which improves cooling by the industrial Sewing heated thread guide organs or the needle brought about becomes.
• the sewing thread according to the invention has due to the reduction of the individual fibers in the fiber yarn spinning of the at least one roving compared to a conventional one Sewing thread containing at least 45 individual fibers in the fiber thread has a considerably reduced thickness on, so that even finer with the sewing thread according to the invention Seams can be created, which was previously conventional Coregarn remained locked.
• the sewing thread according to the invention in Compared to a conventional core yarn cheaper to produce.
• This advantage is in the invention Sewing thread is further emphasized by the fact that during spinning a small amount of fiber yarn in the roving must be processed so that the manufacturing speeds accordingly of the sewing thread according to the invention in Comparison to the manufacturing process of conventional sewing thread accordingly, preferably by 5% to about 15% can.
• a particularly suitable embodiment of the invention Sewing thread provides that the fiber yarn is spun maximum of all rovings seen in the cross section of the sewing thread 41, but preferably less than 41, individual fibers.
• Such a thing Sewing thread is then identical in comparison to one otherwise constructed conventional sewing thread the previously listed Advantages in a special measure and also has one extremely small thickness, without this the sewing Properties will deteriorate in any way.
• this embodiment of the sewing thread according to the invention at least one such roving includes, in which the fiber yarn spinning in cross section of the sewing thread seen a number of individual fibers between 20 individual fibers and has 38 individual fibers.
• this embodiment of the sewing thread according to the invention exclusively such rovings created in which the fiber yarn spinning of all rovings seen in cross section of the sewing thread between Have 20 individual fibers and 38 individual fibers, so owns such an embodiment of the sewing thread according to the invention even more improved sewing properties and can also even while reducing the use of materials and more Create increase in manufacturing speed.
• the individual fibers the mean of the fiber yarn spinning of each roving Stack length between 25 mm and 70 mm, preferably between 33 mm and 43 mm.
• Sewing thread addressed cover of the multifilament It is the soul of every roving when it comes to the inventive one Sewing thread of the total denier of the fibers used for the thread spinning of a roving used between 25 dtex and 200 dtex varies.
• the sewing thread according to the invention has such rovings that have a total titre between 70 dtex and 400 dtex own, these rovings designed as core yarns then in addition to the multifilament soul as a coat trained fiber yarn spinning with a maximum number of individual fibers of 41 individual fibers and in particular less than Has 41 individual fibers.
• Sewing thread A particularly good correlation between the thickness of the invention Sewing thread and the desired properties reached when the sewing thread according to the invention from two to four rovings of those described above or below still to be described type, which under formation of the Sewing threads are then twisted together.
• Such a thing Sewing thread then has in particular an overall titer as a finished one Sewing thread between 140 dtex (2 x 70 dtex) at a minimum and especially a maximum titer of 1,600 dtex (4 x 400 dtex) and is almost for all sewing operations that occur particularly suitable.
• a particularly high-strength embodiment of the invention Sewing thread is achieved when the soul multifile first yarn component of each roving or the Soul of at least one roving made of polyester, in particular made of high-strength polyester.
• a polyethylene terephthalate that also under the name of the high-strength standard in the trade Technical polyester fibers are offered, in particular the intrinsic viscosity between 0.5 dl / g and 0.75 dl / g, preferably between 0.55 dl / g and 0.63 dl / g, varies.
• this intrinsic viscosity is appropriate Polymer solutions in dichloroacetic acid determined at 25 ° C.
• the sewing thread according to the invention preferably has such rovings on which the multifilament first yarn component, the forms the soul of every roving, a filament number in particular between 16 and 300, preferably a single filament number between 24 and 96.
• Such embodiments have a particularly advantageous sewing behavior of the sewing thread according to the invention, in which the second yarn component, which is the spinning of each Roving forms, a fiber yarn made of polyester fibers and / or from cellulosic fibers, in particular from cotton fibers, is.
• a polyester fiber is used as the fiber yarn used for spinning, so this offers opposite the embodiments of the sewing thread according to the invention, the one Have encapsulation of cellulosic fibers, plus the additional
• the advantage that such a sewing thread is then exclusive consists of polyester and therefore in a one-step process using one class of dye, namely of disperse dyes, can be dyed.
• polyester stands for such in the present text Fibers or filaments made exclusively or largely consist of polyethylene terephthalate.
• a particularly good and less hairy cover is used ensured such embodiments of the sewing thread according to the invention, for those for the covering of each roving such fibers are selected, their single fiber titer between 0.6 dtex and 4 dtex, in particular between 0.8 dtex and 2 dtex, varies.
• Fibers, fiber yarns or staple fibers in the sense of the present Registration should all match such thread-like Denote structures that have a limited length, in particular have a length between 25 mm and 70 mm.
• each roving in the invention Sewing thread is a mass ratio of the first thread component to second fiber yarn component, which is the spinning of the first, yarn component serving as soul, from 50:50 to 75:25 and preferably from 58:42 to 68:32.
• a particularly suitable and easily colored embodiment of the sewing thread according to the invention provides that each roving is a first material that is identical Yarn component, i.e. a soul material, which with wound around a fiber yarn winding identical in material is.
• the present invention further relates to a method for producing the previously described embodiments of the sewing thread according to the invention.
• Sewing threads are initially at least two Rovings created, being used to create each roving a fuse made from fiber yarn together with the as Soul-serving multifilament yarn component of a spinning device is fed and spun there. After that the so created at least two rovings that are is core yarns, twisted together, whereby the inventive Sewing thread is formed.
• the sliver of the fiber yarn immediately before being fed to the Spinning device compressed so far that in the finished sewing thread the fiber yarn spinning of at least one roving over the Cross-section of the sewing thread seen a maximum of 41 individual fibers, preferably less than 41 individual fibers and in particular between 20 individual fibers and 38 individual fibers.
• the method according to the invention has the same Advantages that already exist for the sewing thread according to the invention are described so that to avoid repetition this is referred to.
• the inventive method is particularly is economically applicable while saving material, that it is faster compared to the conventional method is executable and that the created according to the invention Sewing thread excellent and universal sewing properties has, as described in detail above is.
• the inventive The process produced a sliver of the fiber yarn immediately before the feed to the spinning device is compressed so far that they are 10 times to 25 times the volume of the spun Rovings, especially 15 times to 20 times the volume of the spun roving. Due to the fact that that fed to the spinning device together with the core material Fibers of the fiber yarn usually only a limited one Thickness, i.e. in particular a thickness of about 1 to 5 layers of the fiber yarn, the volume of the fiber yarn sliver can are approximately equated with the width that the Fibrous thread fastener takes, so that the previously reproduced statement with regard to the compression approximately the following Statement corresponds. This means that in the invention Process the width occupied by the fuse 10 times to 25 times, especially 15 times up to 20 times the thickness of the spun roving becomes.
• Coefficient of twist ⁇ 'for the production of the roving is used between 80 and 130, of course the direction of rotation selected for twisting the thread to the direction of rotation of the roving.
• Nm means the yarn count (titer) in number metric.
• the first step was after conventional method spun a roving, where as The starting material for this roving is a multifilament core with a titer of 139 dtex with a fiber yarn with a Total titre of 65 dtex and a pre-rotation coefficient ⁇ 'of 110 was twisted in the S direction.
• the starting material for this roving is a multifilament core with a titer of 139 dtex with a fiber yarn with a Total titre of 65 dtex and a pre-rotation coefficient ⁇ 'of 110 was twisted in the S direction.
• a mass ratio of filament material (multifile core) of 68.1% and selected a fiber yarn proportion (fiber yarn spinning) of 31.9%
• the roving thus created then has a titer of effectively had 204 dtex.
• This roving was linear Strength of 1,040 cN or a specific strength of 50.98 cN / tex, the loop strength being 676 cN.
• the fibers used in the fiber yarn wrap had one Individual titers of 1.3 dtex and had a stack length of 38 mm.
• Cross sections were created from this standard sewing thread so the number of fibers of the fiber yarn winding of each roving to determine. For this purpose, five were over a length of 2 m Cross sections made. The number then became microscopic of the individual fibers in the fiber yarn spinning of each roving counted. After unwinding 50 m of the standard sewing thread this measurement was then repeated four times that a total of 25 cross sections were evaluated microscopically.
• the roving thus produced had an effective titer of 188 dtex and a mass distribution from filament to fiber content from 73.9 to 26.1.
• the linear strength of the roving thus produced was 1,060 cN, the specific strength was 56.38 cN / tex.
• the loop strength of the roving was 690 cN.
• the roving had an S twist.
• sewing thread E Two of these rovings were made with the formation of the sewing thread, which is hereinafter referred to as sewing thread E, with each other twisted, with the twist in the Z direction below the previous one specified rotation coefficient ⁇ was carried out.
• the sewing thread E is the number of fibers in the fiber covering of each roving averaged 37.69.
• the finished Sewing thread had a total titer of 407 dtex.

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

Applications Claiming Priority (2)

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Citations (4)

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• 1999
  • 1999-03-16 DE DE19911757A patent/DE19911757A1/de not_active Withdrawn
• 2000
  • 2000-02-19 PT PT00103561T patent/PT1036866E/pt unknown
  • 2000-02-19 EP EP00103561A patent/EP1036866B1/fr not_active Expired - Lifetime
  • 2000-02-19 ES ES00103561T patent/ES2357484T3/es not_active Expired - Lifetime
  • 2000-02-19 AT AT00103561T patent/ATE492668T1/de active
  • 2000-02-19 DE DE50016045T patent/DE50016045D1/de not_active Expired - Lifetime
  • 2000-03-16 US US09/526,373 patent/US6425237B1/en not_active Expired - Fee Related
• 2002
  • 2002-04-30 US US10/135,640 patent/US6546711B2/en not_active Expired - Fee Related

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