EP1436451B1 - Method and device for producing a fancy knotted yarn - Google Patents

Abstract

The invention relates to a method and a device for producing a fancy knotted yarn. The treatment air is injected into the yarn channel as primary air via a main bore hole, and as secondary air preferably via two auxiliary bore holes. The introduction of primary air is designed to create a double air vortex, and the introduction of secondary air is designed to ensure the yarn transport and to stabilise the air flow in the yarn channel. The novel solution has surprising advantages in terms of a plurality of quality criteria, predominantly shorter opening lengths, a more uniform vorticity, a number of knots which is higher by approximately 10%, and the possibility of using coarser titers.

Description

Technical area

The invention relates to a method and an apparatus for producing knotted yarn from spun-textured filament yarn in a continuous yarn channel of a vortex nozzle with a centrally directed to the Garnkanalachse main bore for the primary air and at least one auxiliary bore at a distance from the main bore for secondary air.

State of the art

Knotted yarn is produced for various applications by an air swirling process: very coarse titers such as e.g. for BCF yarns, fine yarns for textile titres or for plain yarns. The individual filaments of a smooth or textured filament yarn are incorporated by means of Verwirbelungsstellen. The aim of this treatment is better processability, e.g. when unwinding, weaving or knitting without expensive twisting operations or finishing processes. The thread closure of the swirled yarn is produced by means of swirling nozzles. A particular advantage of these nozzles is that they also function at full production speed of spinning, drawing and draw texturing processes. They can therefore be switched into these processes as cost-effective elements "in line". Core part of a swirl nozzle is the yarn channel with a transverse bore for the compressed air supply.

Based on the previous model presentations, the filament of the current thread opens bubble-shaped above the air flow of the transverse bore. The filaments left and right of the transverse bore within the yarn channel are offset by the two partial flow vortex in an opposite rotation. This creates filament interlacings, called vortex points or nodes, before and after the air bore. If the swirling point now leaves the air flow, the relative movement of the individual filaments is stopped due to the intertwining. By Further transport of the thread continuously unfilmed filaments enter the nozzle. This starts the process from the beginning. Knot formation is therefore a discontinuous process.

The task of turbulence is the achievement of a thread closure, that is, the better holding together of the individual filaments. The turbulence quality is assessed on the basis of three criteria: swirl density, turbulence uniformity and turbulence stability. The most commonly used method for assessing the swirl quality is the measurement of the average number of swirl spots per meter. However, this method says little about the individual distances between the turbulence points. The standard deviation of the swirl density from several measurements does not give any relevant information about the swirl uniformity. If, however, the opening lengths are measured, only the minimum (oil min.) And maximum value (oil max.) Need to be determined. The test result Oilmin. 0.6 cm to 1.3 cm means that all spaces between the turbulence points are within 0.6 cm to 1.3 cm. This is a very accurate quality statement, and it does not even require an indication of turbulence per meter.

The third important quality criterion is the swirling stability. The turbulence must be able to withstand the thread close to the thread tensile forces occurring during processing, ie the turbulence points must not dissolve during processing. So-called hard Verwirbelungsstellen are in textile fabric but better visible than soft. Preferably, therefore, the Verwirbelungsstabilität is adapted to the particular application, that is, only as hard as necessary chosen. A good statement about the application-specific turbulence stability is obtained with a load series. The swirl density is measured at the corresponding yarn load and compared with the result of the basic load.

In the course of the development work it has been shown that with the help of the swirling technique a very large spectrum of different yarns can be combined. On the one hand, existing twisted "multi-component classics" can be substituted, on the other hand completely new, custom-made yarn combinations can be produced. Almost all types of filament yarns can be fluidized together with other filament yarns, for example polyamide, polyester, polypropylene, viscose, acetate, etc., if at least one component fulfills certain requirements with regard to the fineness ratio and flexural rigidity.

There are three basic types of air swirl nozzles: the closed nozzle, the open nozzle with a threading slot, and the mixed type of both, the open / closed nozzle. With the nozzle closed, the yarn must be pulled into the nozzle by means of suction air for threading with appropriate threading aids. The open nozzle has a permanently open Einfädelschlitz, so that the running yarn can be threaded by hand. The open / closed nozzle has mechanical movable means. The nozzle is usually formed in two parts, with a part with the compressed air supply is firmly attached to the machine. The second part is the moving part and, depending on the structural design, is brought into the closed position by folding, turning or sliding either in the open position for threading or for normal manufacturing operation. The open nozzles such as the open / closed nozzles are usually formed in two parts and, in addition to the threading slot in the part which faces the air supply, preferably have a flat baffle surface. The baffle has an important meaning for the Verwirbelungsfunktion. The closed nozzle has lost in importance compared to the other two basic types.

The process speed, especially in the production of spun-stretch textured carpet yarns, has in recent years of about 2000 m / min. at 3500 m / min. elevated. For spinning machines is a speed range of 4000 to 6000 m / min. and more sought after. Since the turbulation takes place "in line" after texturing and before winding, the objective also applies to the vortex nozzles, without loss of quality at a yarn transport speed of, for example, 3000 to 6000 m / min. to work optimally. The vortex nozzles used for Texturgarne usually have a slightly inclined to the conveying direction of the yarn blast air duct. The inclination from the vertical is usually at 10 ° - 15 ° and gives the yarn passing through a slight conveying effect, which is less than the sum of the yarn opposite resistance forces in the nozzle. However, with higher inclination values of the tuyere, that is to say with a higher conveying effect, the swirling power decreases accordingly and the yarn is more slippery. Another consequence of Verwirbleung at higher speeds is the necessary increase in air pressure. This causes a higher density of the air in the yarn channel. At high process speeds, one would like to achieve as much as possible swirling density and turbulence quality as at low process speeds in order to ensure the further processing of the yarn equally. Experiments have shown that the thread tension at the nozzle outlet with increasing yarn speed and at the same time higher air pressure of the tuyere an ever higher percentage increase value compared to the input yarn tension reached. At 4000 m / min. at an input thread tension of 100, an initial thread tension of 120 to 160 results. However, an increase of 20% - 60% is very damaging to the yarn.

The EP 0 326 552 shows an open / closed nozzle of a slightly inclined angle for the air injection. A not insignificant aspect lies in a cross-sectional widening from the air injection point in both directions to the inlet and outlet of the yarn channel. The EP 0 465 407 still beats an approximately constant, the DE 197 00 817 an expanding cross section.

An interesting nozzle design is with the DE 41 13 927 proposed. It is a closed nozzle with a flat baffle on the opposite side of the air injection. It is blown in addition to the air injection as primary air secondary air tangentially into the yarn channel. The DE 41 13 927 subdivided in the air flow in "direct" ie incident perpendicular to the thread, in "Indirect", that is obliquely, at a certain angle, incident on the thread, or "Pulsating", that is, the air is supplied in batches. Throughout the air flow takes place centrally to the yarn channel. The turbulence fluid, predominantly air, is often directed at a certain angle on the thread, whereby a certain conveying effect is achieved. Especially in the processing of BCF yarns, which are used in carpet products and achieve dtex up to 6000, often no clean turbulence, since the air supply is not sufficient. Very high operating pressures and correspondingly large quantities of air are hardly able to remedy this situation. Of the DE-PS 41 13 927 The task was based on developing a swirl nozzle, which achieves a high, clean turbulence and also reduces air consumption. As a solution, a Verwirbelungsdüse is proposed, mainly for processing BCF yarns, with a, at a certain angle to the yarn running Verwirlungsluftkanal, with two other support channels, which are reduced in diameter relative to the main channel and associated with the air jets, left and passing by the yarn on the right, wrap the same. Depending on the yarn path to the yarn running direction, the support channels are arranged below or above the main channel. It is interesting that all attempts of the applicant with the solution according to DE 41 13 927 did not provide any benefits in terms of improving knot formation.

Presentation of the invention

The invention has been based on the object to seek a new method and a new device, which targeted via an influence on possible Verwirbelungsgrundparameter even at greater transport speeds of the yarn high node quality can be achieved.

The inventive method is characterized in that the primary air perpendicular to the yarn channel or with only a small conveying effect and the secondary air via the at least one auxiliary bore supporting the vortex flow and with conveying effect, is supplied.

The inventive device is characterized in that the main bore perpendicular to the Garnkanalachse or with a slight angular deviation for or against a slight conveying effect on the yarn and the auxiliary bore or auxiliary bores are inclined to the Garnkanalachse and directed differently directed to the primary air.

Interesting is the fact that all experiments with auxiliary bores perpendicular to the yarn channel did not improve anything. On the other hand, a slight inclination, especially in the direction of conveyance, in part but also in the direction of conveyance, brought surprising improvements. Furthermore, it was found that the same orientation of the main and auxiliary bores is approximately in accordance with the WO9 / 19549 also brought no improvements.

• Reduktion des Druckes und eine Reduktion des Luftverbrauches
• kürzere Öffnungslänge
• gleichmässigere Verwirbelung
• Knotenzahl ca. 10% höher
• es können höhere Titer in der Düse gefahren werden, z.B. anstelle von 1800 dtex, 2600 dtex, also eine Erhöhung von ca. 40%.

With larger series of experiments, solutions according to DE 41 13 927 as well as the new invention. The result was surprising, as with solutions according to the teaching of DE 41 13 927 almost no improvements were observed in relation to the relevant state of the art. In contrast, the experimental results with the new invention showed a number of improvements:

• Reduction of pressure and a reduction of air consumption
• shorter opening length
• more uniform turbulence
• Node number approx. 10% higher
• Higher titres can be used in the die, eg instead of 1800 dtex, 2600 dtex, ie an increase of approx. 40%.

• das Zentrieren und Stabilisieren des Garnes in dem Garnkanal
• eine gezielte Förderfunktion für das Garn, unabhängig der Verwirbelungsfunktion
• eine Drehhilfe für eine Optimierung der Knotenbildung.

Am besten lagen die Ergebnisse mit Verwirblungsdüsen mit gebogenen Garnkanälen.The new invention allows in particular three positive effects, they are:

• centering and stabilizing the yarn in the yarn channel
• a targeted conveying function for the yarn, regardless of the Verwirbelungsfunktion
• a rotation aid for optimizing knot formation.

The best results were with swirl nozzles with curved yarn channels.

The new invention allows a number of particularly advantageous embodiments. Reference is made to the claims 2 to 7 and 9 to 13 reference.

Brief description of the invention

die Figur 1

rein schematisch die Verwirbelungstechnik mit einer geschlossenen Düse;

die Figur 2

einen Schnitt II- II der Figur 1;

die Figur 3a

eine Ansicht einer Verwirbelungsdüse in Achsrichtung auf den Verwirbelungskanal;

die Figur 3b

das Strömungsbild in dem Bereich der Lufteinblasung;

die Figur 4a

einen Längsschnitt des Verwirbelungskanales einer Lösung des Standes der Technik;

die Figur 4b

einen Schnitt IVb - IVb der Figur 4a;

die Figur 4c

einen Schnitt IVc - IVc der Figur 4a;

die Figur 5a und 5b

die Ergebnisse einer Modellrechnung der Strömung in einer Verwirbelungsdüse des Standes der Technik;

die Figuren 6a und 6b

die Ergebnisse einer Modellrechnung der Strömung in einer erfindungsgemässen Verwirbelungsdüse gemäss Figur 7a und 7b;

die Figur 7a

einen Schnitt VIIa - VIIa der Figur 7b;

die Figur 7b

einen Schnitt VIIb - VII der Figur 7a;

die Figur 7c

eine Ansicht der Figur 7b gemäss Pfeil Xa;

die Figur 7d

eine Ansicht der Figur 7b gemäss Pfeil Xb;

die Figur 7e

eine Ansicht der Figur 7b gemäss Pfeil Xc;

die Figur 7f

eine Ansicht Luftbohrung der Figur 7b;

die Figur 8

eine perspektivische Darstellung einer erfindungsgemässen, dreiteiligen Verwirbelungsdüse für die Herstellung von BCF-Garnen;

die Figur 8a

eine SlideJet-Lösung mit offenem/geschlossenem Garnkanal;

die Figur 9 und 10

zwei weitere Ausgestaltungen einer erfindungsgemässen Verwirbelungsdüse;

die Figur 11

ein Muster von verwirbeltem Garn gemäss Stand der Technik;

die Figur 12

ein Muster von verwirbeltem Garn gemäss neuer Erfindung.

The new solution will be explained in the sequence starting from the prior art with some embodiments with further details. Show it:

the figure 1

purely schematically the swirling technique with a closed nozzle;

the figure 2

a section II-II of FIG. 1 ;

the figure 3a

a view of a swirling nozzle in the axial direction of the swirling channel;

Figure 3b

the flow pattern in the area of the air injection;

the figure 4a

a longitudinal section of the Verwirbelungskanales a solution of the prior art;

Figure 4b

a section IVb - IVb the FIG. 4a ;

Figure 4c

a section IVc - IVc the FIG. 4a ;

FIGS. 5a and 5b

the results of a model calculation of the flow in a vortex nozzle of the prior art;

Figures 6a and 6b

the results of a model calculation of the flow in a vortex nozzle according to the invention FIGS. 7a and 7b ;

Figure 7a

a section VIIa - VIIa of FIG. 7b ;

Figure 7b

a section VIIb - VII of Figure 7a ;

Figure 7c

a view of FIG. 7b according to arrow Xa;

Figure 7d

a view of FIG. 7b according to arrow Xb;

Figure 7e

a view of FIG. 7b according to arrow Xc;

Figure 7f

an aerial view of the FIG. 7b ;

the figure 8

a perspective view of an inventive, three-part Verwirbelungsdüse for the production of BCF yarns;

Figure 8a

a SlideJet solution with open / closed yarn channel;

FIGS. 9 and 10

two further embodiments of a vortex nozzle according to the invention;

the figure 11

a pattern of swirled yarn according to the prior art;

the figure 12

a pattern of entangled yarn according to the invention.

Ways and execution of the invention

In the episode will now be on the FIGS. 1 and 2 Referenced. Both the Verwirbelungsdüse 1 as well as the turbulence on the yarn 2 is shown purely schematically. The FIG. 2 is a section II - II of the FIG. 1 , In the illustrated nozzle is a closed nozzle with a continuous cylindrical bore for the yarn channel 3. In the nozzle body of the swirl nozzle 1, a compressed air supply bore 4 is mounted in the central region perpendicular to the yarn channel 3. The compressed air (blowing air BL) is, as indicated by arrow 5, blown at a pressure of eg 1 to 10 and more bar on the compressed air supply hole 4 in the yarn channel 3. From the yarn, which is guided as a smooth or textured yarn 2 through the yarn channel 3, a swirled yarn 2 'with node K forms respectively. with the typical knot structure, which is also clearly visible from the eye on the yarn. The compressed air 5 is divided in the yarn channel 3 in two partial flow vortex 6, which are the actual trigger for the opening and turbulence. The yarn 2 is supplied at a constant transport speed in the yarn channel 3, which is indicated by an arrow 7. The knot yarn 2 'is withdrawn at a controlled speed according to arrow 8.

The FIG. 3 shows a view of a swirl nozzle in about four times magnification for the production of BCF yarns. At relatively low yarn conveying speeds of less than 1000 m / min. the baffle 9 may still be rounded ( FIG. 3b ). At high and highest powers up to 3000 m / min., Especially from 3000 to 6000 m / min., But the baffle surface is preferably formed as a flat surface, as in the FIG. 3a is shown. The nozzle body of the FIGS. 3a and 3b is divided into two parts with compressed air supply from below, as indicated by arrow BL. In an upper nozzle body 10 with an upper Garnkanalhälfte the baffle 9 is mounted. The nozzle body 10 is fixedly connected via a screw 12 with a lower nozzle body 11. The advantage of the bipartite is, since each nozzle body part is processed completely independently, the first being that the yarn channel shape can be made arbitrarily. As a second major advantage, a threading slot 13 can be arranged between the upper and the lower nozzle body part. This allows threading in the running yarn 7 without having to mechanically move anything at the nozzle. A particularly advantageous design idea of the open nozzle form of the Applicant arises when the channel width Kb - O in the upper nozzle body part 10 is slightly smaller than the corresponding channel width Kb - U in the lower nozzle body part 11 U.S. Patent No. 5,010,631 Referenced. By on the side of the baffle thereby protruding corners 14 and 15, especially the resulting flow guidance, the dividing plane between the upper nozzle body part 10 and the lower nozzle body part 11 has no adverse effect. This applies in particular to the region of the threading slot 13. The straight line T may at most hit the edge 16 of the parting plane of the lower nozzle body part 11, as with T 'in FIG. 3b is hinted at. This prevents too much air from escaping from the threading slot, but especially that the yarn is not damaged at the edges in question and can not escape through the threading slot during operation.

The Figures 4a, 4b and 4c show a proposal for a further embodiment of a known two-part vortex nozzle. It will do that on the WO99 / 19549 Referenced. The open position must be adjusted by moving the upper nozzle body 20, as indicated by arrow 22 and joint 23. In other solutions of the prior art, the upper nozzle body 20 is rotated or moved to the opening of the yarn channel 3 relative to the lower nozzle body 21. The Figures 4b and 4c have as a special feature a division of the compressed air supply as the main air H and as secondary air N. The secondary air is injected symmetrically and substantially in the same direction in the yarn channel. The direction of the blowing air in the yarn channel has, as indicated by angle δ, a very strong conveying action and is preferably proposed between an angle δ of 60 to 87 ° . The main air H and the secondary air N are injected at a small distance X in the direction of the Garnkanallängsachse 24 offset, wherein the main air and secondary air can be arranged offset in or against the flow direction.

• Es darf nicht das primäre Ziel sein, die Wirbelströmung an sich, etwa im Hinblick auf einen Schwingeffekt des durchlaufenden Garnes zu optimieren.
• Das Ziel muss eine Stabilisierung und Optimierung der Wirbelströmung, insbesondere mit Bevorzugung in Garntransportrichtung sein, sowie zumindest teilweise unabhängig davon eine Optimierung der Garntransportfunktion.
• Die Sekundärluft bekommt die Funktion eines in dem Garnkanal integrierten Fadenführers.

The FIGS. 5a and 5b show the results of a model calculation of a vortex nozzle according to FIGS. 3a and 3b , Important for the understanding of the new invention is that the model calculations were made without yarn only with pure air. An exact flow calculation with continuous yarn is not possible with the currently known computer programs. It was found that not the air turbulence, as has been assumed until today, but the disturbance within the vortex zone through the filaments or through the individual filaments only the vortexing effect. The individual filaments are individually swirled with great forces and enormously high speeds. This new realization has fundamental consequences for the design and interpretation:

• It must not be the primary goal to optimize the vortex flow itself, for example, with regard to a vibrating effect of the continuous yarn.
• The goal must be stabilization and optimization of the turbulent flow, in particular with preference in the yarn transport direction, as well as, at least in part, an optimization of the yarn transport function.
• The secondary air gets the function of a thread guide integrated in the yarn channel.

The new invention proposes the supply of primary air as well as secondary air, as in the consequence of the Figures 6a and 6b is explained. Because according to the example FIGS. 5a and 5b the compressed air supply is slightly inclined in the transport direction, creates a stronger vortex flow in the direction of Garnkanalaustrittes Ak2. This can be seen from the larger line concentration in the exit region. The representation according to Figures 6a and 6b starts from the identical nozzle design FIGS. 5a and 5b out. In the Figures 6a and 6b are two auxiliary bores for secondary air SL with an angle δ arranged relatively strong inclined in the transport direction. Both auxiliary bores are arranged symmetrically in the respective edge regions of the yarn channel, as marked by the distance Z. As a variant, the possibility is indicated by δ '.

If one compares now the results of the Figures 5a / 5b and 6a / 6b, then you can see in the Figures 6a and 6b three striking zones A, B and C. The result is a slightly intensified zone A in the area Ak1 and a corresponding zone C in the area Ak2. Quite surprisingly, a very stable edge flow zone B1 arises on both sides of the yarn channel. or B2 in the main turbulence zone V - V. It is the zone in which the knots are actually heavily influenced, unlike the section Ö, which primarily serves the opening of the yarn. As stabilized with the secondary air, the lateral edge region and also a strong conveying effect is generated, the knot formation, as explained earlier, surprisingly, and indeed be positively influenced in all the essential quality criteria.

The FIGS. 7a to 7e show the nozzle shape with which larger test series were driven, which also served as the basis for the model calculations according to the Figures 6a and 6b was chosen. The FIGS. 7a to 7e represent a two-part open nozzle with a lid. The top part 30 is airtight on the nozzle body 10 and the nozzle body 10 is screwed precisely to the nozzle body 11 via a clamping screw 31 ( FIG. 7c ). The uppermost part 30 serves to supply the secondary air SL, which is supplied via a guided through the nozzle body part 10 and the nozzle body part 11 bore 32 and a channel 33 in the uppermost part 30. The feeding of the secondary air SL takes place via two auxiliary bores 34, which lead in the yarn transport direction inclined through the nozzle body part 10 into the yarn channel. For exact positioning of the nozzle body 10 with respect to the nozzle body 11, a dowel pin connection 35 is additionally provided. This ensures that the yarn channel itself, as well as the primary and secondary air supply, always reproducibly match each other. The primary air PL is supplied via the compressed air supply bore 4. The yarn channel is in the FIG. 7b formed on both sides of the compressed air supply bore 4 symmetrically widening in both directions. Advantageously, the extension is formed only in the lower nozzle body 11. The primary air is in the FIGS. 7a to 7e blown easily promoting. Another aspect of a particular advantageous solution is that the primary air and the secondary air are introduced into the yarn duct in the exact opposite direction, as indicated by arrows 36 and 37. The entire vortex nozzle 1 is in the FIG. 7c according to arrow IXe in a plan view, and in the FIGS. 7d and 7e shown in the respective levels IXd and IXe. The Verwirbelungsdüse 1 is attached via the bore 31 and 38 on the machine side. The Figure 7f shows a preferred embodiment with a main bore with a slot or an oval shape, wherein the outer edge of the bore has a distance of at least 0.1 to 0.5 mm to Garnkanalwand, or not quite up to the edge of the yarn channel with the width B leaves. The distance A1 is the effective distance in the yarn channel. Unlike the WO99 / 19549 the auxiliary bores do not simply have a reinforcing function to the main air, but are supposed to directly support the vortex formation.

The FIG. 8 shows an assembled, two-part nozzle 1 with lid for the secondary air supply in perspective view, with the uppermost part 30, and the nozzle bodies 10 and 11th

The FIG. 8a shows a solution with yarn channel that can be opened for threading and closed for operation. For the structural design is on the WO97 / 11214 Referenced.

The FIG. 9 shows a design with an additional relief hole. The relief hole has several functions. Above all, this can favor the formation of air turbulence in the transport direction, can be achieved after the insertion point 4 for the primary air. With the relief hole, which is arranged centrally like the Compressed air supply hole 4, the effect of the secondary air is increased and the vortex formation additionally stabilized.

The FIG. 10 shows a further embodiment with a widening in the direction of transport Garnkanal 3. As a result, a particularly preferred vortex formation in the zone B is achieved and reduced for the vortex formation in the region of the yarn inlet.

The FIG. 11 shows a pattern of entangled yarn with a nozzle of the prior art.

The FIG. 12 shows a pattern of entangled yarn with the same starting yarn, but with the new invention. The air pressure of the feed air was 6 bar, the transport speed of the yarn at 2400 m / min. The yarn count was 2600 dtex with a filament count of 135. It is BCF tricolor yarn (polypropylene).

• das Zentrieren und Stabilisieren des Garnes in dem Garnkanal,
• eine gezielte Förderfunktion für das Garn, unabhängig der Verwirbelungsfunktion
• eine Drehhilfe für eine Optimierung der Knotenbildung.

According to a further very advantageous embodiment, it is proposed that the distance A1 of the auxiliary bores or of the auxiliary bores from the main bore in the direction of the yarn channel is at least 1½ times the diameter D of the main bore. The transverse dimension D of the main bore is preferably formed oval and smaller than the corresponding width dimension B of the yarn channel, such that between the outer edge of the main bore and the yarn channel width an edge distance of 0.1 to 0.5 mm remains, with the auxiliary bores are arranged in the region of the edge distance. Above all, the secondary air acts outside the main wind zone of the primary air and can thus maximize the positive effects described in the introduction, namely

• centering and stabilizing the yarn in the yarn channel,
• a targeted conveying function for the yarn, regardless of the Verwirbelungsfunktion
• a rotation aid for optimizing knot formation.

Claims (16)

1. Method for producing knotted yarn (2) from smooth and textured filament yarn in a continuous yarn channel (3) of an interlacing nozzle (1) with a main bore (4) for primary air which is directed centrally into the yarn channel axis and at least one auxiliary bore (34) for secondary air at a distance from the main bore (4), characterised in that

   ■ the primary air is supplied into the yarn channel (3) perpendicularly or with only a slight conveying effect or a minor effect against the direction of yarn conveyance,

   ■ the auxiliary bore (34) is inclined to a plane perpendicular to the axis of the yarn channel and is directed differently from the primary air, and

   ■ the secondary air is supplied, so as to support the interlacing flow, through the at least one auxiliary bore (34).
2. Method according to claim 1, characterised in that the secondary air is supplied in such a way as to have a conveying effect.
3. Method according to either claim 1 or claim 2, characterised in that the primary air supply is designed with a view to optimising the interlacing effect and the secondary air supply is designed with a view to optimising the conveying effect and as an aid to rotation.
4. Method according to any one of claims 1 to 3, characterised in that the secondary air for centring the yarn (2) in the yarn channel (3) is supplied through at least two auxiliary bores (34) arranged at a distance from the main bore (4) symmetrically and with a tangential entry into the yarn channel (3) at an angle of 5° - 40° to the perpendicular.
5. Method according to any one of claims 1 to 4, characterised in that the primary air is supplied into the yarn channel (3) at an angle of 0° to 15°, preferably of 0° to 10°, to the perpendicular.
6. Method according to any one of claims 1 to 5, characterised in that the yarn channel cross-section is designed as a rounded or planar portion on the side of the main bore (4) for the primary air and on the opposite side is designed with a planar or rounded baffle surface portion, and the at least one or at least two auxiliary bores (34) for the secondary air is/are arranged in the region of the planar or rounded baffle surface with the opening being directed in the opposite direction from the primary air.
7. Method according to any one of claims 1 to 6, characterised in that the distance of the at least one or at least two auxiliary bores (34) from the main bore (4) is from 1/4 to 1 1/3 opening lengths plus knot lengths.
8. Method according to any one of claims 1 to 7, characterised in that the yarn channel cross-section is designed so that it widens in both directions from the main bore (4) for the primary air to the yarn channel inlet and outlet, the side of the yarn channel having the rounded cross-section preferably being designed so that it is bent in both directions in the sense of the widened region.
9. Device for producing knotted yarn in a yarn channel (3) of an interlacing nozzle (1) with the main bore (4) for primary air directed centrally into the yarn channel (3) and at least one auxiliary bore (34) for secondary air which is arranged in the direction of yarn transport at a distance from the main bore (4), characterised in that

   ■ the main bore (4) is arranged perpendicular to the yarn channel axis (3) or with a slight angle deviation for or against a slight conveying effect on the yarn (2), and

   ■ the auxiliary bore(s) (4) is/are arranged at an inclination to the yarn channel axis and in different directions to the primary air.
10. Device according to claim 9, characterised in that the interlacing nozzle (1) is designed as a closed nozzle with a round channel cross-section, the main bore (4) opens, approximately at the middle of the channel, from one side of the nozzle into the yarn channel (3) and an auxiliary bore (34), in particular at least two auxiliary bores (34), open from the opposite side of the nozzle into the yarn channel (3).
11. Device according to claim 9, characterised in that the interlacing nozzle (1) is designed as an open nozzle with respective halves of the channel in a carrier nozzle part and in a nozzle part positioned thereon, the main bore (4) being arranged approximately at the centre of the carrier nozzle part in the yarn channel length, and in the attached nozzle part the auxiliary bores (34) being arranged at a distance from the main bore (4).
12. Device according to claim 9, characterised in that the interlacing nozzle is designed as a clip-slidejet nozzle, which comprises a fixed nozzle part and a movable nozzle part, with an open position for threading and a closed position for normal interlacing operation, the fixed nozzle part comprising the main bore (4) approximately at the centre of the yarn channel length and the movable nozzle part comprising the auxiliary bores (34).
13. Device according to any one of claims 9 to 12, characterised in that

    ■ the main bore (4) opens into the yarn channel (3) at an angle of 0° to 15°, preferably of 0° to 10°, to the perpendicular, and

    ■ the auxiliary bores (34) open into the yarn channel (3) at an angle of 10° to 45° to the perpendicular.
14. Device according to any one of claims 9 to 13, characterised in that the total surface area of the auxiliary bores (34) amounts to approximately 1/4 to 1/3 of the surface area of the main bore (4).
15. Device according to any one of claims 9 to 14, characterised in that the distance A1 between the auxiliary bore(s) (34) and the main bore (4) in the direction of the yarn channel (3) is at least 1 ½ times the diameter D of the main bore (4).
16. Device according to any one of claims 9 to 15, characterised in that the transverse dimension of the main bore (4) is preferably designed to be oval and smaller than the corresponding width dimension of the yarn channel (3) in such a way that an edge distance of from 0.1 to 0.5 mm remains between the outer edge of the main bore (4) and the width of the yarn channel, the auxiliary bore(s) (34) being arranged in the region of the edge distance.

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