Classifications

• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
  • D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
  • D02J1/08—Interlacing constituent filaments without breakage thereof, e.g. by use of turbulent air streams
• • 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
  • D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
  • D02G3/04—Blended or other yarns or threads containing components made from different materials
  • D02G3/045—Blended or other yarns or threads containing components made from different materials all components being made from artificial or synthetic material
• • 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
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S57/00—Textiles: spinning, twisting, and twining
  • Y10S57/908—Jet interlaced or intermingled
• • 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
  • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
  • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
  • Y10T428/24826—Spot bonds connect components
• • 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
• • 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
  • Y10T428/2904—Staple length fiber
  • Y10T428/2905—Plural and with bonded intersections only
• • 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
  • Y10T428/2915—Rod, strand, filament or fiber including textile, cloth or fabric
• • 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
  • Y10T428/2927—Rod, strand, filament or fiber including structurally defined particulate matter

Definitions

• the present invention relates to a multifilament flat yarn with good thread closure, a process for the production of multifilament flat yarns and their use, in particular in the form of thread chains which can be woven without sizing.
• a yarn When used as a warp thread in a weaving machine, a yarn is subject to a large number of mechanical stresses. This includes influences of the dynamic stretching of the yarn, which can lead to loosening of the sizing film, partial dissolving of the intermingling and chafing of adjacent warp threads. Furthermore, the gradual passage through the warp thread monitor causes the yarns to rub against the slats; the constant change of subject causes a relative movement between adjacent filaments, which results in chafing and stretching of the filaments; the strands are subjected to multiple stresses, such as chafing or kinking; there is a scouring and a high relative movement in the reed. In addition, the yarns are damaged by functional elements of the loom, for example by relay nozzles, which can destroy the thread closure by piercing the yarn, and can cause filament breaks, which can lead to thread breaks.
• threads are sized.
• the sizing of warp chains from the processing of staple fiber yarns from natural fibers has long been known (see, for example, Falkai et al. "Synthesefaser", pp. 334-5, Verlag Chemie, 1981).
• the sizing is supposed to Combine the filaments of the yarn for the weaving process, but leave the yarns well separated from each other to form the shed.
• DE-A-2,008,338 discloses blast-textured yarn which, according to the statements given there, can be used as a warp yarn in weaving without the use of a size. Yarns of this type can be woven directly into rifle looms without size or they can also be woven in as warp yarns Use water jet looms. Modern air looms and also water looms which have since been further developed differ from the looms mentioned in DE-A-2,008,338 in that they have a considerably higher weft insertion and shed change frequency.
• the yarns known from DE-A-2,008,338 are characterized by a so-called "interlacing resistance". The yarn describes this size by means of a static load test.
• EP-B-332,980 takes the view that a smooth filament yarn can now only be successfully sized with the highest tack and abrasion resistance.
• an unsized and untwisted polyester multifilament yarn is known that is suitable as a warp yarn for the production of fabrics.
• the yarn is characterized by a tensile strength of at most up to 2 g / denier.
• the advantages of yarns that can be woven without twisting or without the use of sizes are both economic and ecological.
• the sizing process is a further process step in the manufacture of fabrics and accordingly causes costs.
• sizes are usually removed from the fabric after the weaving process, which results in additional costs, waste materials and environmental pollution.
• the degree of intermingling has so far been determined for the characterization of intermingled yarns. This is done with the help of known vortex testers.
• Examples of this are needle test devices, mechanical thick / thin point scanners or optical thick / thin point sensors.
• the needle test value was usually given, measured with the Rothschild needle test device R 2040 or the HOOK-DROP test, as described in US Pat. No. 2,985,995; or the number of swirl nodes per unit length was measured, e.g. with the Reutlinger Interlace Counter or the "ITEMAT" from Enka Tecnica. Both measurement values assess the thread closure of the filaments in the yarn. With these methods one obtains a statement about the length and number of the thread segments closed or left open by the vertebra.
• a multifilament smooth yarn is provided, which can be plainly woven even under the requirements of modern, fast-running weaving machine systems.
• multifilament smooth yarn is understood to mean a multifilament yarn that is composed of a large number of individual filaments and that is not a high-twisted yarn.
• a protective twist for example a twist of up to 50 T / m.
• multifilament smooth yarns are suitable, which are made of continuous filaments and have been stabilized during their manufacture or further processing. These include, for example, nitrided, welded, glued, fused or, in particular, intermingled smooth yarns.
• Examples of this are single or multi-component smooth filament yarns which have been subjected to stabilization, such as intermingling, preferably air intermingling.
• the yarns according to the invention are not subject to any restrictions if yarns from filaments (continuous filaments) can be produced therefrom. It can be yarns made from semi-synthetic fibers, for example yarns made from cellulose fibers, or in particular yarns made from synthetic fibers, e.g. made from polyamides, polyolefins, polyacrylonitrile or in particular polyesters, such as polyethylene terephthalate or polybutylene terephthalate.
• Filament yarns made of synthetic fibers, in particular polyester, which are very particularly preferably air-entangled, are particularly preferred.
• the yarns can also be in the form of filament blends and / or plies.
• Smooth yarns made from drawn multifilaments are very particularly preferred, in particular those with the dtex 76f128, 100f128, 76f64, 50f80 and 50f40 titers
• the term "plain weave” means a multifilament flat yarn which can be used practically when used as a thread chain in an otherwise customary weaving process and which does not require a size to carry out this weaving process.
• this yarn cannot have any of the customary preparations or finishing agents that have been applied to the yarn, for example to carry out or facilitate the manufacturing or further processing steps preceding the actual weaving process.
• the present invention is made possible, inter alia, by the finding that sizes can be dispensed with when used on the loom, if yarns with a certain tendency to open are used, and that simple control methods must be available for testing such yarns.
• One such control method is the method described above for measuring the tendency of multifilament smooth yarn to open under dynamic mechanical stress. With the help of this method it is possible to sufficiently simulate the conditions prevailing on weaving machines and to develop yarns which correspond to the desired requirement profile.
• the degree of intermingling VG beginning and end VG of the yarn to be tested can be determined in a manner known per se .
• turbulence testing devices are needle test devices or preferably mechanical thick / thin point scanners or in particular optical thick / thin point sensors.
• Examples of mechanical thick / thin point scanners are the Reutlingen interlace counter, as described in chemical fibers / textile industry, 29 (10), pp. 862-4 (1979) or the Itemat test device for interlacing, as in chemical fibers / textile industry, 36/88 , Pp. 99 ff. (1986).
• optical thick / thin point sensors are described in EP-A-465,842 and in EP-A-340,600; in the broadest sense, these are systems which, with the aid of optical methods, such as shading, diffraction or reflection, allow the measured variable to be assigned to the thick / thin areas of the tested yarn.
• degree of intermingling is to be understood in the context of this description in the sense that it is a measured value which is obtained by testing the yarn according to the invention, that is to say also a non-intermingled yarn (for example a welded yarn) with a intermingling tester . With this measurement, the thread closure of the filaments in the yarn is assessed; ie length and number of closed or open thread segments.
• the change in the thread closure or the change in the degree of intermingling of the yarn according to the invention is determined in a practical manner under a predetermined static thread tension and under an additional dynamic mechanical load.
• the yarn undergoes a deflection in the section and is guided under a predetermined and non-pulsed tension.
• the yarn undergoes a deflection in the test section, the angle between the two parts of the yarn path being approximately 50 to approximately 5 °, and the deflection being caused by the arrangement of the transport devices and the radial force measuring device.
• the tension can be regulated in a manner known per se, for example by regulating the speed of the transport rollers.
• the static thread tension is monitored by means of the thread tension measuring device.
• the yarn is thus guided under a predetermined and non-pulsed tension in the test section.
• the transport devices can be any device suitable for yarn transport. Examples of this are commercially available, motor-driven godets or delivery plants, preferably frequency-controlled.
• the transport devices are preferably pairs of rollers around which the yarn to be tested is guided several times and the speed of which can be regulated separately. This makes it possible, for example, to simulate a tension as it occurs in a thread chain.
• the thread tension measuring device can likewise be any device suitable for this purpose. Examples of this are the Rothschild tensiometer, the Honigmann Tensitron, the Denkendorf thread tension tensor or the thread tension meter from REES.
• the length of the test track can fluctuate within wide limits; typical values are in the range from 50 to 3000 cm, preferably 150 to 200 cm (weaving machine dimensions).
• the deflection device can be any device suitable for this purpose.
• deflection devices are pistons or eccentrics operating perpendicular to the yarn axis and, in particular, blades rotating perpendicular to the yarn axis, which exert an impact pulse, defined in terms of height and frequency, on the moving yarn.
• the frequency of the deflection device can also vary within wide limits; as well as the amount of tension impulses to be applied to the yarn.
• frequency and tension pulses are selected in a range such that the behavior of a thread chain is simulated on a weaving machine.
• Typical values for the frequency of the deflection device are in the range from 5 to 50 Hz, preferably in the range from 8 to 35 Hz.
• Typical values for the magnitude of the tension impulses to be applied to the yarn lie in such a range that the total tension in the yarn - i.e. the sum of the static yarn tension and the proportion of the tension acting periodically on the yarn (values of the tension amplitude) - is in the range of 0 , 05 to 1.0 cN / dtex, preferably in the range from 0.1 to 0.7 cN / dtex.
• the method described above for characterizing thread chains is very particularly preferably used.
• the yarn is passed through the test section in the form of a thread chain.
• the check is carried out either successively on individual skeins or on several Yarn strands of the thread chain or on all thread strands of the thread chain.
• Such thread chains preferably consist of two to five yarns; the deflection device preferably acts on a plurality of such yarns.
• the degree of intermingling VG beginning and end VG are obtained as measured variables, for example as the number of intermingling points per unit length of the yarn.
• a test variable is the tendency of the yarn according to the invention to open under the test conditions in the test section.
• the evaluation of the measured variables VG beginn and VG end at a predetermined total thread tension K F can be carried out in different ways.
• the quotients VG beginn / VG end or VG end / VG beginn at a certain total thread tension K F are a characteristic for the behavior of the yarn under dynamic mechanical loading.
• the total thread tension K F is the sum of the static thread tension and a portion of the periodically acting on the yarn and caused by the deflection dynamic thread tension assumed in the deflected yarn as it is transported through the test section.
• the distribution of the measured values of the degree of intermingling VG of yarns usually obeys a Poisson function. However, with the same mean values, this is dependent on different parameters, such as yarn material, the conditions during the creation of the thread closure and thread running conditions, and its width is very different.
• the yarn according to the invention has values of VG max ⁇ 30 mm, preferably from 11 to 22 mm, in particular from 18 to 22 mm with the Rothschild needle tester type 2040.
• Preferred multifilament flat yarns according to the invention have VS (K F ) values which are in the range from 60 to 100%.
• multifilament flat yarns as defined above, whose VS (K F ) value is 45-90% and which is measured at a frequency of 15 Hertz and with such a maximum deflection in step c), so that at the maximum deflection in the multifilament smooth yarn results in a total thread tension K F of 0.2 to 0.42 cN / dtex (measured with the Denkendorf thread tension tensor DEFAT).
• the multifilament smooth yarns according to the invention are particularly preferably in a size-free manner and in the form of a thread chain. It is known per se that thread chains with high thread densities are particularly difficult to weave. It has been found that the yarn according to the invention can be woven without size in the form of thread chains with high thread densities.
• the invention therefore also relates to thread chains in which the thread densities are more than 20 threads / cm, in particular greater than or equal to 40 threads / cm.
• the single-filament titer of the multifilament flat yarns according to the invention can fluctuate within wide limits; typically this titer is 0.3 to 6.5 dtex, preferably 0.6 to 1.5 dtex, and very particularly preferably less than 1.0 dtex.
• the yarn titer of the multifilament smooth yarns according to the invention can also vary within wide limits; typically this yarn titer is 20 to 600 dtex, preferably 40 to 400 dtex.
• the number of filaments of the multifilament flat yarn according to the invention typically ranges from 20 to 250, preferably from 40 to 180.
• Types with lower filaments are particularly difficult to use as warp yarns. It is therefore to be regarded as particularly surprising that such yarns can still be woven without difficulty without any problems.
• the invention therefore preferably relates to multifilament flat yarns, as defined above, with capillary numbers from 20 to 80, in particular from 30 to 50.
• the multifilament smooth yarns according to the invention are notable for high strength; in the case of plain polyester yarns, the tensile strengths are more than 2 g / denier, preferably more than 3 g / denier.
• the multifilament smooth yarns according to the invention are usually fluid-interlaced multifilament yarns, preferably air-interlaced multifilament yarns.
• the invention also relates to a production method for producing interwoven multifilament smooth yarns which can be woven without the need for sizing. It has been found that multifilament smooth yarns can be produced with sufficient thread closure and sufficient opening tendency for the plain weaving if the thread is guided with low tension at the location of the intermingling and is preferably carried out in the context of the low tension with particular tension constancy.
• the method according to the invention is characterized in that the yarn tension at the location of the intermingling has the value of May not exceed 0.6 cN / dtex.
• the method according to the invention is particularly preferably carried out such that the yarn tension is kept particularly constant at the location of the intermingling, in particular that the fluctuation in the yarn tension is less than + / - 0.1 cN / dtex.
• This constant voltage can be achieved by means of measures known per se, for example in that supply mechanisms or godets are controlled and regulated by frequency converters.
• Any one- or multi-component filament yarns can be used as master yarns; these yarns are usually drawn before interlacing, unless the filament yarns are the fastest spun and can no longer be drawn.
• the rovings are usually fully drawn yarns, i.e. for types whose maximum tensile force elongation at 25 ° C is less than 80%.
• the orientation and stretching of the spun threads can be carried out in a manner known per se.
• a fully oriented yarn (FOY) can already be produced during the spinning process, which generally no longer needs to be drawn; or it is possible to produce a yarn which can be subsequently processed into a drawn yarn in a post-drawing process.
• These latter post-stretchable yarns are usually LOY, MOY, HOY or POY yarns.
• LOY, MOY, HOY, POY and FOY are well known and e.g. in chemical fibers / textile industry, 6/1985, p. 411-2.
• the stretching can follow the spinning process directly or can be carried out in a separate step, for example combined with a customary aftertreatment, such as fixing.
• the stretching can also take place immediately before the feed to the swirling nozzle, for example by means of upstream stretching godets.
• This variant can be carried out within a post-treatment section or integrated in the spinning process before the location of the intermingling.
• the stretching and swirling can take place in succession in one step, e.g. by swirling a FOY yarn directly in the spinning shaft before winding the yarn. However, it can also only take place in a downstream process, for example by rewinding or re-looping.
• the stretching and swirling can also take place in two or more stages.
• yarns in spinning can be partially oriented, for example as LOY, MOY, HOY or POY yarns, and can then be drawn in a subsequent stage, for example in drawing bobbins or drawing twists. This is done here Swirling only in a subsequent process step after the yarn has been drawn and before it is wound up.
• the intermingling is integrated in a device for carrying out textile processes which is known per se and which has godet pairs which allow the yarn to be guided with low tension.
• a device for carrying out textile processes which is known per se and which has godet pairs which allow the yarn to be guided with low tension. Examples of this are texturing devices, twisting devices or rewinding devices. These devices can additionally be equipped with stretching devices, for example with pairs of godets moving at different speeds.
• the invention preferably relates to a intermingling process, as defined above, wherein a yarn is used as the multifilament roving, the maximum tensile strength at 25 ° C of which is less than 80%, which is intermingled in a known device for carrying out textile processes, which has pairs of godets that allow low-tension guiding of the yarn and between which godet pairs there is at least one intermingling nozzle.
• the invention preferably relates to a intermingling process, as defined above, wherein a yarn is used as multifilament roving, the maximum tensile elongation at 25 ° C is more than 80%, which is subjected to stretching immediately before the intermingling, so that its maximum tensile elongation at 25 ° C after the drawing is less than 80%, and which is subsequently swirled, the drawing device and at least one swirling nozzle being integrated in a device for carrying out textile processes which is known per se and which has godet pairs which allow the yarn to be guided with little tension and between which godet pairs there are at least one swirl nozzle is located.
• a FOY yarn in particular a FOY yarn, which after the Spinning is fed directly to the intermingling, tension isolation being carried out between the spinning process and the intermingling.
• tension isolation being carried out between the spinning process and the intermingling. This is preferably done by means of pairs of rollers around which the yarn is guided without slippage before it enters the intermingling nozzle.
• One- or multi-component yarns can be selected that run into the intermingling unit once or several times and in any case leave it as a compact yarn.
• the intermingling can also be carried out in several stages, the yarn passing through a number of intermingling nozzles connected in series.
• swirling nozzles In the case of a plurality of swirling nozzles connected in series, these can either all be arranged in a voltage-insulated zone or the swirling nozzles are arranged in more than one voltage-insulated zone connected in series.
• the presentation and feeding of the multifilament roving to the intermingling nozzle takes place by means of measures and devices which are conventional per se.
• texturing yarns for the blowing nozzle it is known that the filament material is fed to the blowing nozzle at a higher speed than is drawn off from it.
• the excess speed of the feed compared to the take-off expressed as a percentage based on the take-off speed, is referred to as the advance.
• the advance make sure that the advance of the multifilament roving is selected so that a practically lint-free and loop-free yarn is formed. This is usually the case with leads of less than 3%. In individual cases, however, higher leads can be selected as long as a smooth, intermingled yarn is formed, preferably a multifilament smooth yarn which has the above-defined values for the opening tendency and the thread closure of the interconnected filaments.
• the multifilament roving is intermingled in the intermingling nozzle by means of a fluid, for example by means of liquids or in particular by means of gases. Air is preferred.
• the intermingling pressure is to be selected in the individual case so that the required maximum limit of the yarn tension at the location of the intermingling is not exceeded and that a smooth yarn is formed. Typical values for the swirl pressure are 1.5 to 7.5 bar.
• the roving is preferably swirled with air with the addition of a liquid which wets the roving during the swirling process, for example water.
• the multifilament flat yarn formed is drawn off from the intermingling nozzle. This can be done by means of devices known per se, for example with godets. When choosing the withdrawal tension, care should be taken that the tension of the yarn at the location of the intermingling is less than or equal to 0.6 cN / dtex, preferably 0.1 to 0.4 cN / dtex.
• the intermingled multifilament smooth yarn can then be subjected to a fixing treatment by passing it through a heating device; typical temperatures of the yarn as it passes through the heating device are in the range from 60 to 250 ° C.
• the method according to the invention can be carried out on individual, unground or folded yarns, which are then wound up and processed into a thread chain in a further step.
• the method can also be integrated into the production of warp beams by the swirling by means of a plurality of swirling nozzles connected in parallel on the one provided for the production of the warp beam Thread is carried out. Examples of such integrated methods can be found in DE-AS-2,611,547, EP-A-152,919, EP-A-216,951, DE-A-3,711,767, and DE-A-3,727,262.
• the conditions during the swirling at each of these nozzles can be kept the same or different; in particular, the type of nozzles can be varied or process parameters such as thread tension, intermingling pressure or the application of liquid before and / or after the location of the intermingling on the yarn.
• the multifilament smooth yarn according to the invention can preferably be used in applications in which a low tendency to open such yarns is a prerequisite.
• Example 1 Production of a size-free plain yarn chain from FOY with the title dtex 50f40
• FOY of the titer dtex 50f40 x 1 round made of polyethylene terephthalate is used as the original yarn.
• the yarn is spun using technology known per se, e.g. in DE-A-2,117,659.
• a swirled yarn is produced from the original yarn thus produced by rewinding on a winding machine.
• the yarn When rewinding, the yarn is air-swirled at a frequency of 1100 knots / second.
• the thread tension when entering the swirl nozzle it is kept particularly constant and is less than 0.6 cN / dtex.
• the winding tension is also less than 0.6 cN / dtex.
• the finished yarn is characterized by the following characteristic data: Total thread tension K F (cN / dtex) VS (K F ) (%) VG medium (mm) VG max (mm) IL medium (1 / m) LK medium (mm) unencumbered 100 12th 18th 76 2.5 0.2 96 12th 18th 73 2.0 0.4 86 12th 22 65 1.6 0.6 57 21 65 43 1.3
• Example 2 Production of a size-free plain yarn chain from FOY with the title dtex 76f128
• FOY of the dtex 76f128 x 1 titer made of polyethylene terephthalate is used as the original yarn.
• the yarn is spun using technology known per se, e.g. in DE-A-2,117,659.
• the master yarn thus produced is air-swirled on-line before the first winding at a frequency of 5500 knots / second.
• the thread tension when entering the intermingling nozzle is kept particularly constant and is less than 0.6 cN / dtex.
• the yarn is wound up. The winding tension is less than 0.6 cN / dtex.
• the finished yarn is characterized by the following characteristic data: Total thread tension K F (cN / dtex) VS (K F ) (%) VG medium (mm) VG max (mm) IL medium (1 / m) LK medium (mm) unencumbered 100 7.5 12.5 89 4.2 0.13 100 7.1 11.1 85 4.8 0.40 100 7.1 15.2 85 4.8 0.66 88 8.0 14.1 73 5.6
• Example 3 Re-enactment of a yarn known from DE-A-2,008,338 and checking the running behavior of this yarn on different, fast-running weaving machines
• Example 1 of DE-A-2,008,338 lists the following yarn by name and by way of example: Yarn of polyethylene terephthalate threads of denier 70 den f 34; this yarn is swirled at 2697 m / min under a thread tension of 17 g at pressures of at least 4.6 atm in type A nozzle device described in more detail there.

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

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• 1993
  • 1993-07-23 DE DE4324752A patent/DE4324752C2/de not_active Expired - Lifetime
• 1994
  • 1994-07-18 DE DE59404396T patent/DE59404396D1/de not_active Revoked
  • 1994-07-18 EP EP94111130A patent/EP0635591B1/fr not_active Revoked
  • 1994-07-21 US US08/279,254 patent/US5518814A/en not_active Expired - Fee Related

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