EP2463418A1 - Yarn, particular sewing yarn or embroidery yarn as well as method for producing such a yarn - Google Patents

Abstract

A yarn has structure of core yarn with at least one core consisting of multifilament yarns (6) and covering containing fiber yarns. At least one portion of the fiber, which forms the fiber yarn of covering, is merged over entire axial fiber length or over portion of axial fiber length between the filaments of at least one multifilament yarn. An independent claim is included for manufacture of yarn.

Description

The present invention relates to a yarn, in particular a sewing or embroidery thread, with the features of the preamble of patent claim 1 and a method for producing such a yarn with the features of the preamble of claim 16.

Yarns, in particular sewing or embroidery threads, which have the structure of a core yarn have long been known. Thus, these known core yarns consist of a core which is formed from a multifilament yarn, this multifilament core being wound with a fiber yarn, which is also commonly referred to as staple fibers, which is usually carried out on ring spinning machines. In order to ensure the necessary cohesion of the yarn, the yarn is rotated high after the core material is wound around, or alternatively, at least two braided core materials are twisted together after pre-twisting. Due to the above-mentioned high rotation or by twisting the fiber yarn wrapping is fixed relative to the then rotated soul material or the braided and twisted soul materials due to the thereby caused external clamping of the fiber yarn, so that Aufschiebungen the wrapping are largely avoided.

Furthermore, it is known from staple fiber yarns according to the so-called Murata vortex air spinning method using a single air swirl nozzle to produce relatively bulky fiber yarns, these yarns have a core of fiber yarns and a sheath of Umwindefasern. The sheath of these yarns thus produced has seen over the yarn cross section at least 75 wt.% Staple fibers, which are wound with the help of the fixed, arranged downstream of the nozzle spindle and the air turbulence caused thereby around the core consisting of staple fiber yarns. However, the yarns produced in this way do not have any high mechanical requirements, as they act, for example, when sewing and embroidering on the corresponding sewing or embroidery yarns.

The production of the above-described conventional core yarns is particularly costly due to the application of rotation or twisting, while the last-described pure fiber yarns are not usable as sewing or embroidery threads.

The present invention has for its object to provide a yarn, in particular a sewing thread or an embroidery thread, which has the construction of a core yarn, but the fiber yarns (= staple yarns or short fibers) sheathing this Coregarnes particularly firm on Soul material should be fixed. Furthermore, the present invention has the object to provide a particularly cost-effective method for producing the yarn described above.

These objects are achieved by a yarn with the characterizing features of claim 1 and by a method having the characterizing features of claim 16.

The yarn according to the invention, which is used in particular as sewing or embroidery thread, has the structure of a core yarn on, wherein this core yarn is provided with at least one consisting of a multifilament yarn soul, which in turn has a wrapping of fiber yarns. In contrast to the conventional core yarn described above, however, in the yarn according to the invention at least a portion of the fibers forming the particular untwisted or only slightly twisted fiber yarn of the winding over the entire axial fiber length or over a portion of the axial fiber length between the filaments of the at least a multifilament yarn of the soul involved and in particular clamped. In other words, therefore, a certain proportion of the fibers forming the wrapping over its entire axial length or over a portion of the axial fiber length between the filaments, in particular between the adjacent filaments, the multifilament soul is involved and preferably clamped, while the unincorporated or Unclamped fibers of the wrap (wrapping) spirally arrange around the soul material. Depending on their length, the unconnected or unclamped sections of the fibers also spirally wrap around the core material and fix the uninsulated or unclamped fibers there or protrude from the core longitudinal axis.

In particular, the yarn according to the invention has a proportion of staple fibers which is at most 50% by weight and which is preferably between 50% by weight and 25% by weight and in particular between 45% by weight and 35% by weight, based on the weight of the finished product Coregarnes, varies.

The yarn of the invention has over the conventional core yarn on the advantage that the wrap (wrapping) due to the previously described involvement and in particular entrapment is particularly safe and secure against displacement relative to the longitudinal axis of the soul, without it For this purpose, the high rotation or twisting described at the beginning of the prior art is absolutely necessary. This also explains why the yarn of the invention has a much softer feel than a conventionally made core yarn, which is a particular advantage in terms of comfort in ready-made parts, especially underwear, bedding, towels, blouses, T-shirts o. Like., Which are provided with the sewing thread or embroidery thread according to the invention, proves. The further advantage of the yarn according to the invention is that it is particularly inexpensive to produce compared to conventional core yarns, since cost-intensive up-twining or twisting is not absolutely necessary here.

The positive properties described above have in particular those embodiments of the yarn according to the invention, in which the proportion of over its entire axial length or only over a portion of the axial fiber length included or clamped fibers between 1 wt.% And 60 wt.%, Based on the total fiber weight of the wrap varies. In other words, in this case 1% by weight to 60% by weight of the total fiber weight fraction of the wrapping between the above-described filaments of the core material is bound or clamped, and with increasing proportion of the fibers thus bound or clamped accordingly the slack slope of the wrap (wrapping) can be further reduced. This in turn makes it possible, by varying the proportion of incorporated or trapped fibers, to adjust the requirements imposed on the respective yarn in a particularly simple manner. If, for example, sewing or embroidering is carried out at high speeds and the yarn used for this purpose is deflected many times, then it makes sense to select the proportion of fibers which are bonded over their entire axial length or over a portion of their axial fiber length and in particular clamped accordingly high especially between 40% by weight and 60% by weight, based on the total fiber weight of the wound. However, if the requirements on the particular yarn according to the invention, in particular during sewing or embroidering, are relatively low, ie it is processed at relatively low speeds and / or with a small number of deflections, then the proportion of the fixed fibers mentioned above preferably varies between 1 wt .% And 15 wt.%, And at correspondingly higher requirements, in particular between 16 wt.% And 39 wt.%, Each based on the total fiber weight of the wrapping.

A further possibility for adapting the yarn according to the invention to the special requirements imposed thereon is given by the fact that in a further embodiment of the yarn according to the invention between 1 wt.% And 30 wt.% Of the fibers of the wrapping only over a section and thus not over their entire axial length between the filaments of the existing at least one multifilament yarn soul are involved. Depending on the degree of integration and in particular the entrapment, ie in particular of the surface and thus substantially of the length of the integrated portion of the respective fiber, in this embodiment of the yarn according to the invention, the special core yarn construction can be adapted to the requirements imposed on the yarn according to the invention. In this embodiment as well, a high percentage of the incorporated fiber sections means a particularly high stability of the yarn with respect to the mechanical stresses described above (high speed, high number of deflections), while a smaller percentage of the fiber sections involved accordingly also a lower stability of the yarn Garnes with respect to the mechanical stresses described above causes.

A particularly advantageous embodiment of the yarn according to the invention provides that in this case the core yarn has a single multifilament yarn as the core. Accordingly, depending on the filament count of this single multifilament core yarn and the filament denier, the degree of fixation of the fiber yarns overcladding is also due to entrapped or trapped fibers, so that preferably such a yarn, especially as a fine yarn, i. As a yarn with a low titer is formed.

Much higher mechanical stabilities, however, have such embodiments of the yarn according to the invention, which have as a soul two to five multifilament yarns. If these embodiments of the yarn according to the invention are additionally provided after their manufacture with a low rotation, in particular between 50 and 800 turns / m, preferably between 250 and 500 turns / m, the mechanical stability of these embodiments can be achieved with such simple and cost-effective means further improve or particularly easy to adapt to the particular requirements that occur during processing of the yarn in the confectionery, so that with such a yarn many different tasks can be met.

As already mentioned above, in the case of the yarn according to the invention, in particular its mechanical stability and preferably the displacement of the overlay (wrapping) also depend on how long the fiber section bound by the capillaries (filaments) of the core is. Preferably, these sandwiched fiber sections with a length between 2% and 20%, based on the staple length of the fibers of the fiber yarn, which form the wrapping, are bound or clamped by the filaments of the multifilament yarn forming the core.

A further improvement of the mechanical stability of the yarn according to the invention can be achieved in that at least a portion of the fibers which form the fiber yarn of the wrapping, bound by other fibers of the fiber yarn of the wrapping and in particular is clamped. Such additional incorporation of the fibers of the fiber yarn, which forms the wrapping, can be achieved in particular by providing the core yarn produced according to the invention with a slight twist, which is also commonly referred to as protective rotation, preferably for this purpose on the finished core yarn rotation between 50 turns / m and 500 turns / m, in particular between 100 turns / m and 300 turns / m applied. It is also possible, at least two core yarns according to the invention with or without protective rotation, to twist together, for this small twisting turns between 50 turns / m and 800 turns / m, preferably between 250 turns / m and 500 turns / m, are particularly preferred. If the yarn according to the invention has coregarves provided with a protective rotation, the above-mentioned lower rotations are provided depending on the rotations of the protective rotation for the twisting rotation, wherein preferably the protective rotation in the S direction and the twist rotation in the Z direction are applied.

Likewise, the above-described additional incorporation of the fibers of the wrapping can be achieved by applying a bond to the yarn according to the invention, preferably in a concentration of between 0.2% by weight and 5% by weight, based on the weight of the finished yarn.

With respect to the filament count of the at least one multifilament yarn forming the core, it is generally noted that the desired fixation of the spun yarns depends on the size of the filament count. High single filament numbers of the multifilament soul effect Accordingly, a higher fixation of the integrated fibers of the fiber yarn wrapping and thus a higher mechanical stability, in particular against undesirable displacement of the wrapping during processing of the yarn, which can ultimately lead to a yarn break during further processing or to defective productions, wherein the Einzelfilamentzahl the multifilament soul between 12 and 1,000, preferably between 24 and 96, varies.

Particularly suitable embodiments of the yarn according to the invention have such multifilament yarns as a core whose individual filament titer varies between 0.7 dtex and 5 dtex, preferably between 2.5 dtex and 3.8 dtex. This also makes it possible, by varying the Einzelfilamenttiters the degree of fixation of the fibers of the fiber yarn, which forms the wrapping to make.

As to the material constituting the multifilament yarn constituting the core, it is basically understood that synthetic and semi-synthetic multifilament yarns are selected therefor. These include in particular polyalkylenes, preferably ultra-high modulus polyethylene (Dyneema), peek, glass fibers, carbon fibers, viscose, modal fibers and / or polyacrylic fibers. However, it is particularly suitable for the use of the yarn according to the invention as sewing thread or embroidery thread, if these embodiments as materials multifilament viscose fibers, multifilament polyester fibers, especially high-strength multifilament polyester fibers, multifilament polyamide 6th fibers, multifilament polyamide 6.6 fibers, multifilament aramid fibers and / or multifilament polyamide fibers.

The term "and / or" used in the present specification means that all or some elements of the enumeration thereof are additive or that some or all elements of the enumeration thereof are understood alternatively while the term polyester includes in particular those materials which consist of polyethylene terephthalate. Furthermore, it should be noted that all terms used singular in the present description of the invention also cover the plural of these terms.

Furthermore, the term card sliver describes all band-like structures in which the fibers are largely or completely present in a parallel arrangement and thus also covers the terms used in the art conveyor belt, carded ribbon or combed tape. A combed belt is usually such a belt of parallelized fibers which has a smaller proportion of impurities and / or fibers of lesser axial length compared to an unkempt belt.

Fiber yarn used as a braiding for the yarn of the invention preferably comprises synthetic fiber yarns and / or natural fiber yarns. It is particularly suitable if the yarn according to the invention comprises, as a braiding, a particular untwisted or only slightly twisted fiber yarn (fiber bundle) of cotton, polyester, polyamide, panox fibers, polyacrylonitrile, viscose, modal, wool, polypropylene, acetate and / or aramid. The titer of the single fiber of the aforementioned fiber yarns varies in particular between 0.6 dtex and 2 dtex, preferably between 0.8 dtex and 1.5 dtex.

With regard to the staple length of the previously mentioned fiber yarns, it should generally be noted that this preferably depends on the degree of braiding. In particular, the yarn according to the invention for the wrapping on such fiber yarns whose staple length between 25 mm and 60 mm, preferably between 30 mm and 50 mm, varies.

By varying the soul material, ie depending on whether the soul material is a multifilament smooth yarn, a multifiles textured yarn or air-entangled yarn, the volume and properties of the yarn of the invention can be further varied as desired. If a multifilament plain yarn is used as the core material, the yarn according to the invention has a relatively small volume and a lower reversible elasticity compared with an embodiment which contains an air-twisted yarn or a textured yarn as core material with the same quantitative proportion of stranding. Replacing this plain yarn with a textured multifilament core material increases the elasticity of the yarn of the present invention while providing a large volume and a relatively high reversible elasticity when using an air-entangled multifilament core material.

Depending on the respective use of the yarn according to the invention, it has in particular between 40% by weight and 80% by weight, preferably between 50% by weight and 75% by weight, of the multifilament yarn forming the core and between 60% by weight and 20% by weight. , Preferably between 50 wt.% And 25 wt.%, The wrapping on.

Particularly stable embodiments of the yarn according to the invention are achieved in that two to ten, preferably two to four, core yarns of the type described above in connection with the yarn according to the invention are twisted together. This embodiment of the yarn according to the invention have outstanding properties at high strength properties, which turns out to be particularly advantageous at high sewing speeds, which reach up to 6,000 m / min.

The present invention further relates to a method for producing the various embodiments described above the yarn according to the invention with the characterizing features of claim 16.
The inventive method for producing the yarn according to the invention provides that at least one forming the wrapping of the yarn card sliver is stretched over at least one draw passage and that the drawn card sliver is fed together with the at least one core of the yarn forming multifilament yarn of an air swirl nozzle.

The method according to the invention has, analogously or identically, all the advantages described above for the corresponding yarn according to the invention.

It is particularly advantageous with respect to the incorporation of the fibers of the fiber yarn, which forms the wrapping, if, in the inventive method, the at least one multifilament yarn is spread before contact with the air swirl nozzle. This spreading causes the fibers of the fiber yarn during the actual spinning process, i. Thus, in the single air swirl nozzle, so spun and fixed, as previously extensively described in the yarn of the invention. In this case, this spreading causes in particular that a sufficiently large distance between the individual capillaries of the soul is formed, so that accordingly the integration or entrapment of the fibers of the fiber yarn, which form the wrapping, can be done excellently.

The spreading of the filaments of the multifilament core described above can be effected pneumatically, ie thus in particular by a gas flow and preferably by a flow of air which acts on the multifilament yarn by means of a suitable nozzle or by suction.

It is also possible to effect the desired spreading mechanically, in this respect either a per se known and with the multifilament yarn in contact passing and running transversely to the transport direction wheel or belt is provided. Depending on the speeds of the belt or the wheel and the transport speed of the supplied multifilament yarn and the friction occurring between the wheel or the belt, the degree of spreading can be controlled. However, it is particularly suitable when the multifilament yarn is spread by contact with a finger spacer, wherein the degree of spreading is variable, in particular by the shape and preferably by the curvature of the finger spacer, the type of feeding of the multifilament yarn, in particular its supply voltage and its feed angle ,

Of course, if it is found in connection with the yarn of the invention or in the context of the inventive processes that the yarn forming the core is a multifilament yarn, then this multifilament yarn can be replaced by a family of monofilament yarns or air-intermingled yarns. In this case, this group of yarns mentioned before the air swirl nozzle is supplied in such a way that the monofilaments or the individual air-entangled yarns are arranged at a distance from each other.

If in the process according to the invention not only a single multifilament yarn is used as the core, but several and in particular two to five multifilament yarns are used as the core, these multifilament yarns are preferably supplied individually to the at least one stretched card sliver in front of the air swirl nozzle so as to be spaced apart from the front are arranged. Thus, in this variant of the method according to the invention can be dispensed with the spreading, However, it is of course also possible to provide here the Aufspreizvarianten described above.

Of course, it is also possible, the previously mentioned two to five, the core of the core yarn forming multifilament yarns combined in groups or in groups and thus bundled be supplied to the stretched card sliver.

The term feeding, as used above in connection with the method according to the invention, means in particular that the multifilament yarn or filaments are also brought into contact with the at least one drawn card sliver. This can preferably be achieved by means of a tube to be passed through by the multifilament yarn or a ring to be passed through, which is positioned in the running direction of the card sliver, in particular directly in front of the air swirl nozzle.

If in the method according to the invention with a fiber yarn, which forms the wrapping of the yarn according to the invention, worked from natural fibers and in particular from cotton fibers, so provides a development of the method according to the invention, that the card sliver is additionally combed. The combed tape thus produced from the card sliver then has a uniform length of the staple fibers, since by means of this additional process step such staple fibers are combed out, which are quite short-stacked. This in turn means that a yarn produced therefrom, in particular a sewing or embroidery thread, can be processed perfectly within the confection even under extreme mechanical stress.

It is particularly advantageous if, in the method according to the invention, the card sliver is stretched over a stretch zone having at least two and preferably two to three stretch passages As a result, on the one hand, a perfect stretching and, on the other hand, high production speeds are made possible.

Particularly good results with respect to the mechanical and technological properties of the yarn according to the invention are achieved when the card sliver with a total delay between 50-fold and 350-fold, preferably between 230-fold and 280-fold, before spinning the core yarn, in particular on the spinning machine, is stretched.

In particular, the stretching of the card sliver in the method according to the invention is carried out in such a way that the card sliver is introduced with a sliver fineness of between 5 Ktex and 1.5 Ktex of the draw zone.
Due to the fact that the method according to the invention enables high production speeds, the core yarns according to the invention can be produced in a particularly cost-effective manner by this process. High speeds preferably mean that the drawn card sliver is supplied to the air swirl nozzle at a delivery speed between 150 m / min and 400 m / min, preferably between 220 m / min and 320 m / min.

If a particularly high degree of fixation of the fiber yarns forming the wrapping is to be achieved relative to the core material, then it is advantageous to turn the yarn according to the invention after its production or to twist it with at least one further yarn according to the invention. The rotation or twisting preferably varies between 50 rotations / m and 800 rotations / m, in particular between 250 rotations / m and 500 rotations / m.

Advantageous developments of the yarn according to the invention and of the method according to the invention are specified in the subclaims.

Figur 1

eine Draufsicht auf den Bereich der Zuführung des die Seele bildenden Multifilamentgarnes zu dem die Umspinnung bildenden Fasergarn; und

Figur 2

eine Seitenansicht zu Figur 1, teilweise mit aufgebrochener Luft-Dralldüse.

The invention will be explained in more detail with reference to embodiments in conjunction with the drawings. Each show schematically:

FIG. 1

a plan view of the region of the supply of the soul-forming multifilament yarn to the spun yarn forming fiber; and

FIG. 2

a side view too FIG. 1 , partially with broken air swirl nozzle.

In the figures, the same elements are provided with the same reference numerals. It should be noted that the figures are schematic, not to scale drawings.

For clarification it should be noted that in the FIG. 1 for the sake of clarity seen in the running direction of the yarn, as indicated by the arrow 10, the spindle, as described in detail in FIG FIG. 2 is not shown.

A generally designated 1 stretched card sliver has a plurality of parallelized individual fibers 1a to 1c, in which case only three individual fibers are shown by way of example. The pair of rollers 2 and 3 form the outlet roller pair of the draw zone, wherein opposite to the direction 10 of the yarn before the pair of rollers 2 and 3, a further pair of rollers 4 and 5 is arranged.

Denoted by 6 is a multifilament yarn which forms the core of the finished yarn. This multifilament yarn 6 has a plurality of individual filaments 6a, 6b and 6c, wherein only the two outer individual filaments 6a and 6b and a middle individual filament 6c are shown by way of example. From a supply, not shown, the multifilament yarn 6 is withdrawn and spread over a finger spacer 7 in the transport direction 10 so that the individual filaments 6a, 6b and 6c shown by way of example are spaced apart and fed to the fibers 1a, 1b and 1c of the drawn card sliver 1 shown by way of example become. As a result, some of the fibers of the card sliver 1 are at least partially bound by individual filaments, in particular adjacent filaments of the multifilament yarn 6 and in particular clamped and fixed when the yarn has passed the air swirl nozzle 8 and the associated spindle 11. By the pair of rollers 2 and 3, the stretched card sliver 1 brought into contact with the multifilament yarn 6 is then fed to the air swirl nozzle 8, whereby the yarn 9 according to the invention is spun through the air swirl nozzle 8 with the associated spindle 11.

The FIG. 2 reproduces this spinning process in detail. Downstream of the air swirl nozzle 8 a fixed spindle 11 is arranged, which, as already mentioned, in FIG. 1 not shown. Due to the prevailing in the air-swirl nozzle 8 air flow conditions and the special nozzle geometry, a portion of the fibers of the fiber yarn 1 is placed over the spindle 11 downstream of the air swirl nozzle and there in a rotational movement according to arrow 12, resulting in that Wrap this part of the fibers of the fiber yarn around the soul and form the wrapping there, as in FIG. 1 is schematically indicated by the reference numeral 13.

Embodiment 1

On a Murata Vortex Type 861 E air-jet spinning machine (manufacturer: Murata Machinery Ltd., Japan) was a card sliver, consisting of a polyester fiber yarn, type 333, fiber length 38 mm, single filament denier 1.3 dtex after stretching the card sliver with two multifilament yarns as air - spun as in principle in the FIGS. 1 and 2 shown and described above. It should be noted that the machine was additionally equipped with the pictured and described Fingerbreithalter 7.

Each of the two multifilament yarns used consisted of polyester, type 712, 33 dtex, f 16. The following parameters were set on the vortex machine for this purpose: Hauptverstreckungsrate: 55-fold Gesamtverstreckungsrate: 270 times Delivery and admission ratio: 0.980 Delivery Speed: 270 m / min Cross Wrap: 16 ° traverse angle Air nozzle pressure: 5 bar

Two of the core yarns thus produced were then twisted on a Hamel 2000 machine, the twisting direction being S, and the twisting twist being 450 turns / m.

Embodiment 2

On the machine described above, a second yarn was produced. The following parameters were used as a basis:

The multifilament yarn used to form the core was made of polyester, type 714, 74 dtex, f 24. The following parameters were set on the vortex machine for this purpose: Hauptverstreckungsrate: 55-fold Gesamtverstreckungsrate: 270 times Delivery and admission ratio: 0.980 Delivery Speed: 263 m / min Cross Wrap: 16 ° traverse angle Air nozzle pressure: 5 bar

As a fiber yarn forming the sheath of the core yarn, cotton was selected, with a denier of 3.8 dtex and a staple length of 34 mm.

Two of the core yarns thus produced were then twisted on a Hamel 2000 machine, the twisting direction being S, and the twisting twist being 450 turns / m.

Embodiment 3

On the machine described above, a third yarn was produced. The following parameters were used as a basis:

Each of the two multifilament yarns forming the core consisted of Type 712, 74 dtex, f 24. For this purpose, the following parameters were set on the vortex machine: Hauptverstreckungsrate: 40x Gesamtverstreckungsrate: 235-fold Delivery and admission ratio: 0.96 Delivery Speed: 240 m / min Cross Wrap: 16 ° traverse angle Air nozzle pressure: 6.5 bar

As the spun yarn which formed the coreground, a type 333 polyester having a titer of the single fiber of 1.3 dtex and a staple length of 38 mm was selected.

Three of the core yarns produced in this way were then twisted on a Lezzeni TBR-LA machine, with each core yarn initially provided in the S direction with a rotation of 520 turns / m. Subsequently, these three pre-twisted core yarns were twisted together with twisting in the Z direction at 500 turns / m.

Of the previously prepared coregarn yarns used as sewing yarn, the following technical parameters were determined. technical parameters Yarn according to embodiment 1 Yarn according to embodiment 2 Yarn according to embodiment 3 Total fineness in 310 322 897 dtex (155x2) (161x2) (299x3) Maximum tensile force in cN 1212 ± 37 1196 ± 106 3893 ± 70.5 Maximum tensile strain in% 15.76 14.99 20.5 Tenacity in cN / tex 38.96 37.04 43.36

Of the above-mentioned three core yarn twists according to Embodiments 1 to 3, all of which were conceptualized as sewing yarns, the sewing performance was determined. The results are summarized in the table below. sewing operation Yarn according to embodiment 1 Yarn according to embodiment 2 Yarn according to embodiment 3 Reverse sewing 150 cN 95.4% 100% Reverse sewing 200 cN 83.4% 97.6% thermal 208 mm load-bearing capacity forward sewing Number of thread breaks 0 Zigzag sewing 275 cN thread breakage 0 Skip stitch 0 Zigzag sewing 325 cN thread breakage 0 Skip stitch 0

To determine the sewing performance of the yarns according to Embodiments 1 and 2, a modified industrial sewing machine, type Pfaff DOST sewing machine, class 483-G-8 / 01-900 / 5 was used, with a stitch length of 5 stitches / cm, a stitching frequency of 5,000 stitches / min and a needle system System 134, needle size Nm 80, have been used. Two layers of a body (manufacturer: Ettlin spinning, KF72 160 cm variaminblau, 3344 Sanfor, cotton, 100% OE yarn) were cut to 150 cm in the warp direction and sewn together on one side. The strip width was approximately 20 cm in the weft direction. Five stitches were made per unit and span, sewn up to a length of 750 cm or until the thread breaks.

For evaluation, the ratio of average seam length of all five seams to Gesamtnähgutlänge was determined and gives the Rückwärtsnäheigenschaften of the yarn according to the embodiments 1 and 2, which is given in percent. To exclude errors, the respective result is correlated to the values determined using a standard thread.

To determine the sewing performance (thermal loadability) of the yarn according to Embodiment 3, a modified industrial sewing machine, type Pfaff DOST sewing machine, class 483-G-8 / 01-900 / 5 was used, wherein a commercially available bobbin thread Nm 50, a stitch length of five stitches / cm, a stitch frequency of 5,000 stitches / min and a needle system 134, needle size Nm 90, were used. Seven layers of a fabric were cut to about 30 cm in the warp direction and about 25 cm in the weft direction, superimposed and with a seam spacing of about 3 mm five times over the entire length sewn together. The average length of the seam in mm until the yarn break results in the thermal load capacity. The yarn had melted at the thread break. To exclude errors, the respective result is correlated to the values determined using a standard thread.

To determine the forward sewing properties of the yarn according to Embodiment 3, a modified industrial sewing machine, type Dürkopp Adler DOST sewing machine, class 272-140342 was used, with a stitch length of 3 stitches / cm, a stitching frequency of 5,000 stitches / min and a needle system of Nm 80 stitches have been used as a basis. Three layers of a nonwoven fabric were cut to 150 cm, the triple nonwoven web was placed around the sewing machine table and fixed, so that the cut edges overlap. The endless belt thus produced was sewn at full speed for thirty rounds of 45 m.

For the evaluation, the number of yarn breaks was determined. To exclude errors, the respective result is correlated to the values determined using a standard thread.

In order to determine the zigzag sewing properties of the yarn according to Embodiment 3, an industrial sewing machine, type Pfaff sewing machine, Class 418 was used, with a stitch length of 1.5 stitches / cm, a stitching frequency of 3,500 stitches / min, an overstitch width of 5, 0 mm and a needle system 438, needle size Nm 110, were used. Both upper thread and lower thread were made of the yarn according to Embodiment 3. Three layers of a standard nonwoven fabric were cut to 150 cm. The doubled nonwoven webs were placed around the sewing machine table to form an endless belt, and the cut edges overlapped and fixed. At full speed were given per specified voltage range Sewed 15 m seam. Per voltage range, the number of thread breaks and the number of missing stitches are given in the table above. To exclude errors, the respective result is correlated to the values determined using a standard thread.

The standard nonwoven used in the sewing method described above in Embodiment 3 during forward sewing and zig-zag stitching is a nonwoven fabric made by Freudenberg (product name: BO50810T150L100, Article No. 53385724). When determining the thermal load capacity, the fabric used there was produced by the Uhingen spinning mill and has the following technical properties: tent fabric, 159 cm R 2/2, 28 / 32.5 28/16 cm / Nm, cotton chain, 100% OE - yarn, weft cotton, 100% ring yarn.

The embodiments described above demonstrate that all three threads have good to excellent bonding properties.

Claims (23)

Yarn, in particular sewing or embroidery thread, which has the structure of a core yarn with at least one core consisting of multifilament yarns and a braiding of fiber yarns, characterized in that at least a portion of the fibers forming the fiber yarn of the braiding over its entire axial fiber length or is incorporated over a portion of its axial fiber length between the filaments of the at least one multifilament yarn of the soul. Yarn according to Claim 1, characterized in that the proportion of incorporated fibers varies between 1% by weight and 60% by weight, based on the total fiber weight of the wound. Yarn according to Claim 1 or 2, characterized in that between 1% by weight and 30% by weight of the fibers of the wrapping are bonded over a portion of their axial fiber length between the filaments of the core consisting of the at least one multifilament yarn. Yarn according to one of the preceding claims, characterized in that the core yarn has a single multifilament yarn as a core. Yarn according to one of Claims 1 to 3, characterized in that the core yarn has as a core two to five multifilament yarns. Yarn according to one of the preceding claims, characterized in that the portion of the fibers with a binding and in particular clamping length between 2% and 20%, based on the length of the fibers of the fiber yarn, is integrated by the filaments of the multifilament yarn forming the core. Yarn according to one of the preceding claims, characterized in that at least a portion of the fibers which form the fiber yarn of the wrapping is bound by other fibers of the fiber yarn of the wrapping and in particular is clamped. Yarn according to one of the preceding claims, characterized in that the multifilament yarn forming the core has a single filament count between 12 and 1000, in particular between 24 and 96. Yarn according to one of the preceding claims, characterized in that the multifilament yarn forming the core has a single filament denier between 0.7 dtex and 5 dtex, preferably between 2.5 dtex and 3.8 dtex. Yarn according to one of the preceding claims, characterized in that the multifilament yarn forming the core consists of multifilament viscose, multifilament polyester, multifilament polyamide 6, multifilament polyamide 6,6-multifilamentary aramide and / or multifilament polyamide fibers. Yarn according to one of the preceding claims, characterized in that the fiber yarn is a synthetic fiber yarn and / or a natural fiber yarn and has a single fiber titer between 0.6 dtex and 2 dtex, preferably between 0.8 dtex and 1.5 dtex. Yarn according to Claim 11, characterized in that the fiber yarn has a staple length of between 25 mm and 60 mm. Yarn according to one of the preceding claims, characterized in that the multifilament yarn forming the core is a multifilament plain yarn, a multifilament textured yarn or an air-twisted yarn. Yarn according to one of the preceding claims, characterized in that the yarn contains between 40% and 80% by weight, preferably between 50% and 75% by weight, of the multifilament yarn forming the core and between 60% and 20% by weight .%, Preferably between 50 wt.% And 25 wt.%, The wrapping has. Yarn according to one of the preceding claims, characterized in that it has two to ten, preferably two to four, core yarns twisted together. A method for producing a yarn according to one of the preceding claims, characterized in that at least one carding belt forming the yarn is stretched over at least one draw passage and that the drawn card sliver is fed to an air swirl nozzle together with the at least one multifilament yarn forming the core of the yarn becomes. A method of making the yarn according to claim 16, characterized in that the at least one multifilament yarn is spread apart prior to contact with the air swirl nozzle. A method according to claim 16 or 17, characterized in that the card sliver is combed. Method according to one of Claims 16 to 18, characterized in that the two to five multifilament yarns forming the core of the core yarn are each fed individually to the drawn card sliver. Method according to one of claims 16 to 19, characterized in that the card sliver is stretched over a draw zone with two or three draw passages. Method according to one of claims 16 to 20, characterized in that the card sliver is drawn with a total delay between 50-fold and 350-fold before spinning the core yarn. Method according to one of claims 16 to 21, characterized in that the card sliver is introduced with a belt fineness between 5 Ktex and 1.5 Ktex of the draw zone. Method according to one of Claims 16 to 22, characterized in that the drawn card sliver is fed to the air swirl nozzle at a delivery speed of between 150 m / min and 400 m / min.

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