EP1030938B1 - Device and process for intermingling yarn - Google Patents

Description

The invention relates to a swirling device for swirling of multifilament yarns according to the preamble of the claim 1 and a method of swirling at least a multifilament yarn according to the preamble of claim 18.

Swirling devices and methods of those mentioned here Kind are known from DE 37 11 759 C2. They serve the cohesion of the filaments of the multifilament yarn and to improve its further workability since that single multifilament yarn when it is the interlacing device is fed, is still unrotated or only slight Protective twist, which still does not have sufficient cohesion preferably thermoplastic or other materials existing filaments for further processing. The multifilament yarn receives the necessary cohesion only by swirling its filaments. By means of the swirling device can also use the filaments of multiple multifilament yarns swirled together to form a multifilament yarn become.

The swirl quality / swirl result is characterized by intermingling points, i.e. the confusion / entanglements of the filaments, and the one between the Interlacing points in which there are essentially non-swirled, i.e. open yarn places. With the intermingling of the multifilament yarn can continue there is also a very weak turbulence in which no swirling points arise, just a slight, hardly visible tangle of filaments. Such yarns show only a small thread closure and can be used without additional measures associated with high costs, for example Twisting / twisting or finishing, not or only to a limited extent to be processed further. "Thread closure" is a common term for the compactness of the multifilament yarn and describes the cohesion or cohesion of the Filaments.

The known interlacing device has a yarn channel through which the multifilament yarn having a number of filaments to be led. The filaments are by means of one emerging from an opening cross section of a blowing nozzle Compressed air flow swirled. The blow nozzle has usual a circular or elliptical opening cross-section on, which is formed symmetrically to the longitudinal central axis of the yarn channel is. The swirling device has the disadvantage on that not in all cases the intermingling of the filaments of the multifilament yarn to a desired interlacing result leads. The multifilament yarn shows irregularities, in some cases longer missing parts, that is, non-vortexed ones Yarn places, what in the processing of the multifilament yarn, for example weaving, tufting, knitting, knitting, Sewing will result in these open, unprotected threads to be damaged. Break individual filaments and push themselves up, causing a thread break or the break of Neighboring threads and / or defects in textile fabrics arise.

It is therefore an object of the invention to overcome these disadvantages of the prior art avoid the art and a swirling device and to create a process that swirled the quality of the Yarn improves and is able to reach the knot period as well as to equalize the open yarn places. Besides the swirling device should be simple and work economically in terms of air consumption. This object is achieved according to the features of claim 1.

From DE 28 13 368 C2 is already known in one Swirling nozzle has a main jet stream and also a pulsating one Secondary jet flow to be used in the opposite direction or introduced into the yarn channel at right angles to one another to meet each other there. This procedure has however did not lead to the intended success and has therefore cannot be enforced in practice.

It is also known from DE 41 13 927 A1, in the yarn channel to introduce a main air stream by means of a blow nozzle, whose opening cross-section is essentially symmetrical to Longitudinal axis of the yarn channel is formed. Furthermore, are in pairs Side streams are provided, the one side stream in the one edge area and the other side stream in the other Incoming edge area of the yarn channel. Here, too Side streams on the side opposite the main stream of the yarn channel introduced. Apart from that this execution is expensive because there is an air supply for the removable cover is required for the secondary air flows, has been surprising shown that it depends, according to the of the Invention proposed solution, main and secondary flows in to be directed essentially in the same direction and not as in the stand the technique of leading in opposite directions to each other. Obviously there is a disturbance in the main air flow, resulting in increased air consumption and poor swirl results leads.

From CH-PS 415 939 it is known to the media supply lines a circular cross section or any other suitable To give shape, such as rectangle, oval shape or the like. However, the present invention relates to a nozzle channel mouth, whose shape depends on the fact that the medium, especially compressed air, in the form of a main stream in the middle Area and pairwise side streams in the edge areas of the yarn channel flows. One such teaching is this CH-PS also not to be hinted at.

The fact that main and secondary flows essentially in the same direction the main stream can be directed in the middle range act much more intensively on the yarn. The one in the yarn channel incoming main stream divides into two, at least in partial current vortices of equal strength, which are the vortex of the filaments. Each in an edge area side streams flowing in of the yarn channel surprisingly support through the coincidence the turbulence and ensure that the filaments stay in the Border areas (dead zones) in which there are practically none Whirling takes place, but again and again Main airflow are exposed. This will increase the number of the non-swirled, open yarn spots and the Shortened lengths of these imperfections. Because of the advantageous Interaction of the main flow and the secondary flows can a preferably good swirl result the medium consumption, and thus the costs of turbulence, be reduced. Furthermore, an increase in Production speed, that is the running speed of the filaments, and thus the economy of the Swirling device, with a satisfactory Swirl quality given.

By "dividing" the medium flow is to be understood that the The main flow and the secondary flows are not physically separate have to. The division into main and secondary flows can also by designing the cross section of the nozzle. By the coordination of main flow and secondary flows in such a way that the main flow versus each of the two side flows leads the largest volume flow of the medium, the The above-described effect of the turbulence is increased because strong side flows to impair the main flow being able to lead.

The opening cross section is according to another embodiment variant of the secondary flow from the opening cross-section of the main flow Cut. The medium flow is thus divided into several separate partial flows, which at least when flowing into the yarn channel are spaced apart. With others Words, the bias nozzle arrangement has the first embodiment just one blow nozzle and after the second Design variant at least two blow nozzles, the at least two blow nozzles the physical separation of the partial flows effect of the medium flow.

In a preferred embodiment of the swirling device is the opening cross-section of a blow nozzle educated. This is, on the one hand, the manufacture of the opening cross section and on the other hand the medium feed that the Blow nozzle with a medium under pressure, preferably Compressed air, supplied, easy to implement.

But it may also be necessary that the opening cross-section of several, preferably two or three blow nozzles is formed, from each of which a partial flow of the medium flow flows. This is in the arrangement of the main flow and the side streams to each other as well as their targeted inflow in the middle area or the peripheral areas of the Yarn channel given greater flexibility and independence also with regard to different blowing air pressures.

Furthermore, an embodiment of the swirling device preferred, which is characterized in that the Main stream - in the direction of the filaments - side streams is subordinate. The inflowing into the edge areas Secondary flows capture those that are routed through the yarn channel Filaments and transport them to the middle area of the yarn channel in which the filaments are subsequently separated from the Mainstream are swirled. This can make thick and long Swirling points / nodes are formed which are high Show uniformity. If, on the other hand, the main flow becomes -in Direction of the filaments viewed - upstream of the secondary flows, it has been shown that this generally shortens and thinner swirl dots are formed, at the same time a higher swirl frequency is achieved. This results from the mean length of the swirl points and the mean length of the spaces and gives the number of Swirl points per meter. The swirl frequency is also - apart from the multifilament yarn itself - from the thread speed when swirling, from the set Thread tension and on the fineness and structure of the Filaments that are smooth or crimped are affected.

Further advantageous configurations of the device result from the other subclaims.

The task is also solved by a method that the in Claim 18 features mentioned. The fact that the Medium flow into a main flow and in pairs of secondary flows is divided, which is directed essentially in the same direction are, the main stream is amplified in the central area of the Yarn channel effective while the side streams in the two Edge areas too long stay in these for the turbulence prevent ineffective areas. It will be strong Turbulence points are created and defects are avoided. By the interaction of the main flow and the Side streams are a high swirl quality with one low medium consumption achieved.

Figur 1

eine Seitenansicht eines Ausführungsbeispiels einer Verwirbelungsvorrichtung;

Figur 2

eine schematische Draufsicht auf einen Garnkanal;

Figuren 3 bis 15

jeweils eine Draufsicht auf einen öffnungsquerschnitt einer ersten Ausführungsvariante der erfindungsgemäßen Blasdüsenanordnung, bei welcher Haupt- und Nebenströme durch die Gestaltung des Querschnitts einer Blasdüse erzeugt werden;

Figuren 16 bis 19

jeweils eine Draufsicht auf den öffnungsquerschnitt einer zweiten Ausführungsvariante der Blasdüsenanordnung, bei welcher Haupt- und Nebenströme körperlich getrennt sind;

Figuren 20 und 21

jeweils eine Draufsicht auf den öffnungsquerschnitt einer weiteren Ausführungsvariante der Blasdüsenanordnung mit zwei Hauptströmen;

Figur 22

eine Schnittansicht des Garnkanals;

Figur 23

einen schematischen Querschnitt der Verwirbelungsvorrichtung.

The invention is explained in more detail below with reference to the drawing. Show it:

Figure 1

a side view of an embodiment of a swirling device;

Figure 2

a schematic plan view of a yarn channel;

Figures 3 to 15

in each case a top view of an opening cross section of a first embodiment variant of the blowing nozzle arrangement according to the invention, in which main and secondary flows are generated by the design of the cross section of a blowing nozzle;

Figures 16 to 19

in each case a top view of the opening cross section of a second embodiment variant of the blow nozzle arrangement, in which the main and secondary flows are physically separated;

Figures 20 and 21

in each case a top view of the opening cross section of a further embodiment variant of the blowing nozzle arrangement with two main streams;

Figure 22

a sectional view of the yarn channel;

Figure 23

a schematic cross section of the swirling device.

The swirling device described below is generally used for interlacing multifilament yarns. among multifilament yarns are related to the present Invention of both smooth and crimped multifilament yarns Roger that. The crimped multifilament yarns are, for example, by false twist, stuffer box, Edge drawing texturing produced. The multifilament yarn exists from a number of filaments, preferably made from thermoplastics, for example polyamides, Polyester, polypropylene, polyethylene, but also made of viscose, Glass, Kevlar, carbon or other high-modulus fibers exist.

With the help of the swirling device it is also possible the filaments of several multifilament yarns together into one Swirl multifilament yarn. Furthermore can also Fancy yarns are made, as well as blends of Multifilament yarns with fiber yarns or elastane yarns.

The interlacing device can be used, for example, on texturing machines or also on other machines or systems, for example on spinning, drawing twine or winding machines be used. By means of the swirling device interwoven multifilament yarns are woven, knitted, Knitting, tufting machines and similar textile machines for Manufacture of textile fabrics processed without that it is imperative for the multifilament yarns to be aftertreated, such as twisting, twisting, finishing and the like Generation of the required thread closure is required.

Figure 1 shows schematically a side view of an embodiment a swirling device 1 which a Housing 3 includes, here several, a total of two housing parts 5 and 25. The second housing part 25 is by means of a hinge 9 via a swivel arm 7 rotatable on the first housing part 5 hinged and thus forms a cover. By means of a fastened to the second housing part 25 Handle 11 is the second housing part 25 with its solid position shown in solid lines his open position shown in dashed lines in Figure 1 folded.

The swirling device 1 further comprises a Housing 3 penetrating straight yarn channel 13 of the Housing parts 5, 25 is formed. If the second housing part 25 is in its closed position is the yarn channel 13 circumferentially with the exception of the opening cross-section a blow nozzle arrangement, not shown, closed and only at its inlet mouth and its outlet mouth open. To a multifilament yarn, not shown in Figure 1 to be able to insert into or take out the thread channel 13, without first cutting it, the second housing part 25 folded up, so that the yarn channel 13 over its entire length is exposed. The blow nozzle arrangement is via a feed line 14 connected to a medium supply, by means of which the blow nozzle arrangement with a medium under pressure, preferably air, can be acted upon. The multifilament yarn is when passing through the straight yarn channel 13 with a Medium flow acts on the filaments with each other swirled, whereupon in the following with reference to FIGS. 2 to 23 is discussed in more detail.

On the second housing part 25 is a serving as a rigid support U-shaped bracket 15 attached to the angled Poor, of which only the arm 17 can be seen in Figure 1 is, a yarn guide 19 is attached. These will - seen in the vertical direction - from the bottom open U-shaped Ironing formed on the upper edges of her interior spaces open at the bottom guide surfaces 21 for deflecting the Have multifilament yarns.

The yarn channel 13 is in this embodiment first housing part 5 incorporated in the form of a groove a semicircular, clear, constant along its length Has cross section. The ceiling 23 of the yarn channel 13 is from the flat underside of one attached to the swivel arm 7, second housing part 25 is formed. The cross-sectional shape of the Yarn channel 13 can also be designed differently.

Figure 2 shows schematically a plan view of the first housing part 5 of the swirling device 1, in which the Yarn channel 13 is incorporated. This is based on its longitudinal central axis 26 transverse to the running direction of the filaments seen (arrow 27) - in two imaginary, hatched representations Areas divided, namely in a middle Area 29 and in outer edge areas 33, which between the Edges of the yarn channel 13 and the central region 29 are. The edge regions 33 are also referred to as dead zones.

To achieve a desired swirl result, the opening cross section 37 of the blowing nozzle arrangement shown in FIG formed such that the 13th inflowing medium flow in one main flow and in two Secondary streams is shared. The main stream H flows into the middle, central area 29 and divided by the Impact against the underside of the housing part or cover 25 in two partial flow vortices with different directions of rotation (Figure 23) showing the desired local twists / entanglements of the filaments of the multifilament yarn. The filament twists can be different have local patterns, for example braided or Cable pattern. The two side streams N, which are the actual Turbulence of the filaments practically does not contribute to the flow each in one of the edge areas 33 and guide the in the Edge areas 33 guided filaments in the middle area 29 of the yarn channel 13, where it is detected by the main stream H and to be swirled. This will increase the amount of time the Filaments in the edge areas 33 through the yarn channel 13 be guided, reduced so that non-vortexed, open Thread spots avoided, but at least be reduced. By the swirling of the filaments takes place by means of the medium flow basically a structuring of the multifilament yarn instead, that is, by twisting the multifilament yarn also changed optically. This through the medium flow generated effects, for example swirl points and of individual filaments of the multifilament yarn Loops can be divided by the inventive Medium flow defined and influenced in several partial flows thereby be designed.

The following is a first with reference to Figures 3 to 15 Design variant of a blow nozzle arrangement explained in more detail, where the opening cross-section of a single blow nozzle 37 is formed. Figures 3 to 15 each show one Top view of an embodiment of the vertical in the Yarn channel 13 opening blow nozzle 37. The not shown Multifilament yarn passes through the yarn channel 13 in the direction an arrow 27, that is to say as shown in FIGS 15 from right to left.

Figure 3 shows a blow nozzle 37a, the opening cross section symmetrical to the longitudinal central axis 26 of the yarn channel 13 and a transverse axis 41 is formed, which with the longitudinal central axis 26 a right angle, ie an angle of 90 ° includes. The intersection between the longitudinal central axis 26 and which is orthogonal to this standing transverse axis 41 - seen transversely to the longitudinal extension of the yarn channel 13 - in the or - according to another embodiment, not shown - approximately in the middle of the yarn channel 13. If related with the present invention information on symmetry made an opening cross section of a blow nozzle arrangement from a vertical line of sight to the respective opening cross-section, that is, from a viewing direction in the direction of the longitudinal extension of the axis of the in the Thread channel 13 opening blow channel 37 started. The symmetry specification therefore only applies to a top view of the opening cross-section the blow nozzle arrangement. The opening cross section the blow nozzle 37a is substantially cruciform educated. One imaginary bar of the cross lies on top the longitudinal central axis 26 and the other imaginary bar on the Transverse axis 41. The connection areas of the imaginary beams are rounded in such a way that they extend to the edges 33 of the yarn channel 13 extending partial opening cross sections of the blow nozzle 37a are smaller than that in the central region 29 located partial opening cross section of the blowing nozzle 37a.

Through the - seen across the direction of the multifilament yarn - differently sized partial opening cross sections the one flowing through the opening cross section into the yarn channel 13 Medium flow in the main flow H and in the pair Secondary streams N divided.

As can be seen from FIG. 3, the main stream H defines the middle range. The cross sections for the main stream H are chosen so that the main flow H always a larger volume flow of the medium leads to each of the side streams N. How already mentioned above and shown in detail in FIG. 23, bounces the main flow H on the underside delimiting the yarn channel 13 the cover 25, which creates two partial flow vortices, which swirl the filaments of the multifilament yarn. In the the secondary regions flowing into the edge regions 33 of the yarn channel 13 N ensure that the swirling into the edge areas guided filaments back in as soon as possible reach the middle area 29. This will increase the amount of time in which the filaments are located in the edge area, in where there is practically no turbulence. It a very good swirl result is achieved by the Reduced number of open swirls and the lengths of these stolen stones are shortened.

Figure 4 shows a blow nozzle 37b, the opening cross section in the is substantially V-shaped, being between the legs respectively Arms of the V-shape a gain 61 of the main stream H is provided. Through this the V-shape in essentially changed to a W-shape, which together with a triangle forms the opening cross-section. The arms of the V shape or the W-shape also reach here Edge regions 33 of the yarn channel 13.

Figure 5 shows a blow nozzle 37c, which is essentially one has cross-shaped or X-shaped opening cross section. The lying X has one on the longitudinal central axis 26 of the Yarn channel 13 lying center beam 45, which is the main stream H leads and is wider than that to the edge areas 33 protruding crossbars 47 and 49, which are the secondary flows there H lead. The blow nozzle 37c is symmetrical to that Longitudinal central axis 26 and the transverse axis 41 are formed. From the crossbar 47, 49 of the cross-shaped opening cross section outflowing side streams each have a smaller one Volume flow to than from the central area of the opening cross-section, that is, from the center beam 45 formed main opening. The direction of the thread through the arrow 27 Thread channel specified. It follows that the by Ends of the crossbars 47 and 49 led bypasses Lead the main stream. At the same time, they are mirror images to the transverse axis 41 ends of the transverse beams 47 'and 49 'a lagging bypass pair. By this arrangement becomes a very small influence on the main flow good return transport of the filament threads from the edge areas 33 causes an exceptionally good and uniform Quality of the swirl nodes results.

The blow nozzle 37d shown in FIG. 6 has a triangular one Opening cross-section and is in the yarn channel 13th arranged that one of two sides of the equilateral here Triangle-shaped tip 51 on the longitudinal central axis 26 of the Yarn channel 13 is. The blow nozzle 37d is symmetrical to Longitudinal central axis 26 formed. That in the direction of arrow 27 multifilament yarn passed through the yarn channel 13 initially hits on the in the area of the tip 51 of the opening cross section emerging main stream H, which becomes increasingly larger, and then by the side streams from the area of Tips 51 'and 51' 'of the triangular opening cross section emanate. It has been shown that a higher swirl frequency is realizable if the secondary flows N extend further into the edge regions 33 of the yarn channel 13. The higher swirling frequency comes about because the Swirl points are shorter than those using a blowing nozzle are generated, in which the side streams N generating parts of the opening cross-section less in the Border areas are sufficient.

The blowing nozzle 37e shown in FIG. 7 also has one triangular opening cross-section, with its on the Longitudinal central axis 26 lying on two sides of the broad, isosceles triangle tip 53 formed from the central area of the opening cross section of the blowing nozzle 37e outflowing main stream - in the direction of the multifilament yarn seen (arrow 27) - is subordinate. The multifilament yarn is therefore first of all on the broad base of the Triangular led. This is compared to the arrangement of the in Figure 6 shown blow nozzle 37d a more intense and more uniform interlacing of the filaments with longer interlacing knots achieved. The opening cross section of the Blowing nozzle 37e is - as in all other exemplary embodiments the blow nozzle according to the invention symmetrical to the longitudinal central axis 26 trained.

Figure 8 shows a blow nozzle 37f, which has a triangular opening cross section has, the triangle isosceles and compared to the triangles shown in Figures 6 and 7 is very narrow. This is the middle of the opening cross-section the blow nozzle 37f very pronounced, in particular compared to those in the edge regions 33 of the yarn channel 13 protruding edge zones of the opening cross section. Thereby the main flow is strong compared to the secondary flow pair. That from the sides of the isosceles triangle The tip 55 formed lies on the longitudinal central axis 26, that the multifilament yarn passed through the yarn channel 13 is first detected by the main stream, but also at the same time the paired sidestream is effective in the range of the base side of the isosceles triangle formed partial opening cross section into the edge regions 33 of the yarn channel 13 flows.

Figure 9 shows a blow nozzle 37g, which has a T-shaped opening cross section having, that of the crossbar 57 of T-shaped partial opening cross section that of the longitudinal beam 59 of the T-shaped partial opening cross-section Direction of travel of the multifilament yarn seen (arrow 27) - upstream is. The crossbar 57, which is narrower than that Longitudinal bar 59 extends into the edge areas 33 of the yarn channel 13. The incoming multifilament yarn thus reaches first the "wide" side of the T-shaped opening cross-section, in which main and secondary flow act. This causes a more even swirling occurs because at the same time due to the bypass pair, the multifilament yarn dodges prevented in the dead zones 33 by the bypass pair becomes.

Figure 10 shows a blow nozzle 37h, the opening cross section has a Y-shape, the substantially V-shaped part the Y-shape the part formed by a straight bar -in Direction of travel of the multifilament yarn seen (arrow 27) - upstream is. The ends of the V-shaped part of the Y-shape extend far into the edge zones 33 of the yarn channel 13 the filaments of the thread through the yarn channel 13 Multifilament yarns in the edge areas 33 from those from the V-shaped Exiting part of the opening cross section of the blow nozzle 37h Secondary streams recorded first and in the middle Area 29 of the yarn channel 13 passed. Then the Filaments of that formed from the longitudinal beam of the Y-shape Partial cross-section of the main jet flowing 37h captured and swirled. Through this Y-formation of the The cross-section of the opening becomes the main flow from the secondary flows less disturbed than with 37h blow nozzle and comes immediately full effect.

The blow nozzle 37i shown in FIG. 11 differs of the blowing nozzle 37h shown in FIG. 10 only because that the Y-shape of the opening cross-sectional area is changed is. The legs of the Letters have an oblique course, so that this not quite as far into the edge regions 33 of the yarn channel 33 extend as the legs of the shown in Figure 10 Y-shaped opening cross section.

FIG. 12 shows a blow nozzle 37k, which has an opening cross section has that of a third embodiment is derived from a Y shape. The symmetrical to the longitudinal central axis 26 trained longitudinal beams of the Y-shape is opposite Y shapes shown in Figures 10 and 11 wider. Farther the free end of the longitudinal beam is relatively short and wedge-shaped.

The blow nozzle 371 shown in FIG. 13 has a fish-shaped one Opening cross section on that of an ellipse and two legs forming a V-shape is derived. The both legs extend into the edge regions 33 of the yarn channel 13, while the ellipse with its large semiaxis on the longitudinal central axis 26 of the yarn channel 13 and thus the Main stream forms.

FIG. 14 shows a blow nozzle 37m which has an opening cross section with a curved V-shape. Under "swinging" is understood to mean that the legs of the V-shape are not straight, but have a curvature, respectively are bent. Furthermore, all corners of the opening cross section the blow nozzle 37m rounded or point - according to a further embodiment, not shown Radius on. The opening cross section is in the middle Area 29 of the yarn channel 13 widened. Because in this embodiment the legs protrude far into the edge areas, the filaments are quickly transported out of the dead zones.

The blow nozzle 37n shown in FIG. 15 has a opening cross-section essentially derived from a triangle on the two V-shaped arms which extends into the edge regions 33 of the yarn channel 13 protrude.

FIGS. 16 to 19 each show a top view of the opening cross section of a further embodiment with a blowing nozzle arrangement 35, in which the opening cross section of several, here in each case a total of three blow nozzles 37/1, 37/2, 37/3 is formed. These open away from each other in the yarn channel 13 and each have a partial opening cross section on, which together the opening cross section of the Form blow nozzle assembly 35. The partial opening cross section of the Blower nozzle 37/1, from which the main flow of the medium flow into the Flowing yarn channel 13 is larger than that of the blowing nozzles 37/2 and 37/3, from which the bypasses of the medium flow escape. Regardless of the number of blow nozzles The blow nozzle arrangement is the opening cross section of all Embodiments - looking in the direction of Axis of the blowing duct opening into the thread duct - symmetrical to the longitudinal central axis 26 of the yarn channel 13.

The partial opening cross sections of those shown in FIG. 16 Blow nozzles 37/1 to 37/3 are circular. The middle the blow nozzle 37/1, from which the main flow of the medium flow in the yarn channel 13 flows in, lies at the intersection between Longitudinal central axis 26 and transverse axis 41. The blow nozzles 37/2 and 37/3, from each of which a secondary flow into the yarn channel 13 flows in are in the direction of the multifilament yarn seen (arrow 27) - upstream of the blow nozzle 37/1. The blow nozzles 37/2, 37/3 each lie in one of the edge areas 33 of the yarn channel 13.

The exemplary embodiment of the blow nozzle arrangement shown in FIG. 17 35 differs from that in FIG. 16 illustrated embodiment only in that the Partial cross sections of the bias nozzles 37/1 to 37/3 elliptical are trained. The major semi-axis of the Partial cross-section of the blow nozzle 37/1 forming ellipse lies on the longitudinal central axis 26. The major semiaxes of the compared to the partial opening cross section of the blow nozzle 37/1 blow nozzles each having smaller cross-sectional areas 37/2, 37/3 run perpendicular to the longitudinal central axis 26.

Figure 18 shows an embodiment of the blow nozzle arrangement 35, in which the opening cross section of a triangular and two elliptical partial opening cross sections is formed. The blow nozzle 37/1, which has a triangular partial opening cross section has - is in the running direction of the multifilament yarn seen (arrow 27) - upstream of the blow nozzles 37/2, 37/3, such that one side of the partial opening cross section is parallel to the transverse axis 41. On this page this is done by the Yarn channel 13 guided multifilament yarn first, so that at the same time the main flow and a secondary flow pair to the effect come.

The exemplary embodiment of the blow nozzle arrangement shown in FIG. 19 35 comprises two blow nozzles 37/2, 37/3, the Partial cross sections are elliptical and a blow nozzle 37/1, the partial opening cross section of a V-shape with a Center extension 65 has. This increases the partial opening cross section. The blow nozzles 37/2 and 37/3, from which each a secondary flow of the medium flow into the yarn channel 13 inflow, the blow nozzle 37/1 in the direction of the Multifilament yarns seen upstream, so first one Sidestream pair is effective. Since the blow nozzle 37/1 with their Partial opening cross sections into the edge areas 33 of the Yarn channel 13 is enough, then almost sets with the main stream at the same time again a secondary flow pair. The partial opening cross sections the blow nozzles 37/1, 3 // 2, 37/3 together the opening cross-section of the blow nozzle arrangement, the symmetry with the longitudinal central axis 26 of the yarn channel 13 preserved.

In all of the exemplary embodiments described with reference to FIGS. 3 to 19 the blowing nozzle arrangement 35, the opening cross section shown with sharp corners or edges these corners have a fillet radius, currently in one area for manufacturing reasons from 0.03 mm to 0.20 mm.

Looking at Figures 16, 17 and 19 it becomes clear that preferably the blow nozzles from which the side streams of the The medium flow flows into the yarn channel 13, the blow nozzle which the main flow of the medium flow flows into the yarn channel 13, are upstream. That is, the filaments of the multifilament yarn are initially from the side streams in the Edge areas 33 of the yarn channel 13 are detected and only then of the inflowing in the central region 29 of the yarn channel 13 Mainstream swirled. In the embodiment according to FIG. 18, the filaments are caught by the main stream, but also from the side streams. The subordinate Bypass flow pair of blow nozzles 37/2 and 37/3 reinforces the Sidelux effect without affecting the main flow.

It has among other things shown that preferred a good swirl result is achieved with low air consumption if Main and secondary flows, locally, not at the same time Act.

Particularly good results were obtained with almost all types of yarn the embodiment of Figure 20, but also Figure 21 achieved. The Figure 20 shows a plan view of an embodiment of the Blower nozzle arrangement 35, in which the longitudinal central axis 26 symmetrical opening cross-section formed by a blow nozzle 37o is. The opening cross section of the blow nozzle 37o settles composed of two imaginary partial opening cross sections, the are interconnected. The first partial opening cross section is essentially C-shaped and extends directly to the edges of the yarn channel 13. This partial opening cross-section is seen in the direction of the multifilament yarn (Arrow 27) - the elliptical second partial opening cross section subordinate, from which only the main flow of the medium flow flows into the yarn channel 13. In the connection area between the partial opening cross sections of the blow nozzle 37o, the in the area the transverse axis 41 is the width of the opening cross section less than in the upstream and downstream Area. As a result, the main stream is divided into two main streams divided, locally and - according to a preferred embodiment variant - also on the multi-parliamentary thread one after the other Act. According to a further variant (not shown) the main flow of the medium flow in more than two, i.e. divided into at least three main sub-streams. The "division" is not to be understood physically, but takes place in particular through the design of the Opening cross section, such as that in Figure 20 illustrated embodiment realized.

The led in the edge regions 33 through the yarn channel 13 Filaments are first of all from the C-shaped partial opening cross section of the blow nozzles 37o outflowing passed into the central region 29 of the yarn channel 13, where this from the first main stream of the medium stream be grasped and swirled. This is a desired one Structuring of the filaments or multifilament yarn possible.

FIG. 21 shows another embodiment variant of that in FIG. 20 Blow nozzle arrangement 35 shown, in which the opening cross section is formed by two blow nozzles 37/1 and 37/2. The Partial cross-section of the blow nozzle 37/1, from which the main flow of the medium flow flows into the yarn channel 13 a circular cross-section. The essentially C-shaped Blowing nozzle 37/2 is immediately upstream of blowing nozzle 37/1 and extends into the edge regions 33 of the yarn channel 13. The two main currents are therefore physically separate from one another separated, that is, the first main stream with the Secondary streams and the second main stream become two from each other separate blowing nozzles blown into the yarn channel 13. In contrast, the flow shown in FIG Blower nozzle 37o the main flow and the secondary flows together a blow nozzle in the yarn channel 13. When looking at the figures 20 and 21 it is clear that the opening cross sections of the two blowing nozzle arrangements 35 are very similar to each other. It a very similar effect is therefore achieved.

FIG. 22 shows a sectional view of an embodiment of the Yarn channel 13 through which a multifilament yarn shown in dashed lines 69 is performed. One opens into the yarn channel 13 Blowing nozzle 37, the opening cross section of which is variable and for example from one based on the previous FIGS. 3 to 21 shown cross sections are formed can. The blowing nozzle 37 is opposite the longitudinal central axis 26 of the yarn channel 13 inclined by an angle δ between the Axis 71 of the blow nozzle 37 and the longitudinal central axis 26 of the Yarn channel 13 is measured.

According to a first embodiment variant, the blowing nozzle 37 inclined by an angle δ with respect to the longitudinal central axis 26, that in a range of 60 ° ≤ δ ≤ 90 °, preferably from 75 ° ≤ δ ≤ 87 °. It has been found that through the Defined inclination of the blow nozzle 37, the swirl result can also be influenced. In the previous ones Figures 3 to 21 illustrated embodiments of the Blower nozzle arrangement 35 is the angle δ -as described above- merely by way of example 90 °. To make an optical change, thus structuring the multifilament yarn generate, it has proven to be particularly advantageous Angle δ ≤ 60 ° to choose. This can, for example Loops and other structures of the filaments in the desired Generated way. The invention can thus also Texturing filament yarns can be used with success. It has been shown that, as a rule, by the inclination of the Blowing nozzle in the running direction of the multifilament yarn 69, in particular for textured yarns and for texturing yarns a better swirl result can be achieved than with an inclination of the blowing nozzle 37 against the direction of the Multifilament yarn. However, that is enough with one against the Direction of rotation of the multifilament yarn inclined blowing nozzle 37 achievable swirling result in many cases the requirements so that basically the inclination of the blowing nozzle 37th is practically arbitrary.

In the case of a blow nozzle arrangement 35, the multiple blow nozzles 37 has, as for example with reference to Figures 16 to 19 and 20, 21 described, the blow nozzles 37/1, 37/2 and 37/3 different from the longitudinal central axis 26 of the yarn channel 13 be inclined, i.e. different angles δ exhibit. The main flow and the secondary flows act here in different directions, but still in essentially the same sense of what an optimal coordination of Operation of the partial flows of the medium flow enables.

In FIG. 23, one is based on a schematic cross section Swirling device the mode of action in the yarn channel 13 inflowing main stream H and the secondary streams N des Medium flow shown. In the embodiment shown here main and side streams are not physically separate from one another Cut. Of course, the functional representation is on physically separate main and secondary flows without further ado transferable.

The blowing nozzle opens at the bottom of the semi-circular yarn channel 13 in the middle area, in which the one indicated by an arrow H. Main flow of the medium flow flows in and on impact splits into two partial flow vortices on the cover plate 25, which have an opposite sense of rotation. Through this The filaments of the multifilament yarn become partial flow eddies swirled intensely, so that strong swirling points or Swirl nodes are formed. However, be there the filaments also into the edge regions 33 of the yarn channel 13 flung, which, as already described above, dead spaces form so that there is no turbulence. By in the Edge regions 33 entering secondary flows N, which are approximately the same flow towards the main stream H into the yarn channel the filaments are caught by these side streams and returned to the middle area 29 of the yarn channel 13 so that they only remain briefly in the dead zones of the edge regions 33 and are immediately exposed to the main airflow again which causes the swirl. As from the right half of the FIG. 23 shows that the secondary air flow N is only one Part of the edge region 33 of the yarn channel 13 through the mouth cross section reached. Depending on how far the edge area 33 is reached by the secondary air flow N, can the effects vary. In Figures 3 to 21 is for example the mouth in the edge region 33 corresponding to the right half of Figure 23 shown. Of course you can the edge region 33 which is flowed through by the secondary flows up to extend outside the yarn channel 13 under the cover 25, as shown in the left half of Figure 23. Through this Variation can also be crucial in the swirling in terms of nodes, number and strength and frequency of the same can also be influenced. Figures 3 to 21 are therefore also to be understood in relation to this variation, too when it is shown in the figures that the opening cross section ends before the edge of the yarn channel 13.

The description of FIGS. 1 to 23 shows a Process for the treatment of filament yarns in order to swirl. It consists of turning the medium flow into a main flow and split into pairs of side streams, the Main stream in the middle area of the yarn channel and the one of the side streams in one edge area and the other the secondary flows in the other edge region of the yarn channel be initiated. Main and secondary flows are essentially directed in the same direction so that their directions do not cross. A certain different direction of Media flows H and N are permitted, provided that these directions each within areas 29 and 33 (FIG. 2) lie. The main stream is said to be generally opposite each of the both side flows lead the larger volume flow for themselves. By coordinating the size of the side streams accordingly compared to the main current, the time period in which the There are filaments in the edge areas of the yarn channel, decrease so that the result of the turbulence is positively influenced. It can be done this way Limit open swirls of yarn to certain sizes. Also the number of knots, the size and strength the same can be changed in a targeted manner. The width the middle area where the actual swirling takes place, as well as the remaining marginal areas in which No swirling occurs through the main stream certainly.

In summary, it should be noted that the division of the Medium flow into several partial flows the swirl quality is improved. At the same time, medium consumption can be preferred reduced with a consistently good swirl result be so that the cost of turbulence can be reduced are. Through the effective interaction of the side streams with the main flow of the medium flow is an increase the running speed of the multifilament yarn and thus the Swirling device productivity possible.

Claims (23)

1. An interlacing device for multifilament yarns having a yarn passage in which the filaments of the multifilament yarn are adapted to be interlaced by means of a medium stream exiting from an aperture cross-section of an air-blow nozzle, particularly a compressed-air stream, wherein the aperture cross-section of the air-blow nozzle is essentially formed symmetrically with respect to the longitudinal axis of the yarn passage and produces a main stream, and a pair of secondary streams are provided with one secondary stream flowing into one external area and the other secondary stream flowing into the other external area of the yarn passage, characterized in that the main streams (H) and secondary streams (N) are substantially directed in the same direction.
2. The interlacing device according to claim 1, characterized in that the medium stream is divided by the aperture cross-section of an air-blow nozzle assembly (35; 37) into a main stream (H) and a pair of secondary streams (N).
3. The interlacing device according to any one of claims 1 or 2, characterized in that the main stream (H) carries the major volume stream of the medium as compared to each of the two secondary streams (N).
4. The interlacing device according to one or more of claims 1 to 3, characterized in that the aperture cross-section of the secondary stream (N) is separated from the aperture cross-section of the main stream (H).
5. The interlacing device according to one or more of claims 1 to 4, characterized in that the main stream (H) is located downstream of the secondary streams (N) as viewed in the direction of run of the filaments.
6. The interlacing device according to claim 5, characterized in that secondary streams (N) are located downstream of the main stream (H).
7. The interlacing device according to one or more of claims 1 to 6, characterized in that the main stream (H) is formed from a plurality of partial streams.
8. The interlacing device according to one or more of claims 1 to 7, characterized in that the secondary stream (N) extends beyond the outside of the yarn passage (13) so as to run under the cover plate (25) in the external area (33) of the yarn passage (13).
9. The interlacing device according to one or more of claims 1 to 8, characterized in that the aperture cross-section is symmetrical or substantially symmetrical with respect to a transverse axis (41) which encloses a right angle, along with the longitudinal central axis (26).
10. The interlacing device according to one or more of claims 1 to 8, characterized in that the aperture cross-section is formed asymmetrically with respect to the transverse axis (41).
11. The interlacing device according to one or more of claims 1 to 10, characterized in that the aperture cross-section is formed in a Y shape (37h; ...; 37o;37/2).
12. The interlacing device according to one or more of claims 1 to 10, characterized in that the aperture cross-section is formed in a cross shape (37a).
13. The interlacing device according to one or more of claims 1 to 10, characterized in that the aperture cross-section is formed in a triangular shape (37d;...;37f).
14. The interlacing device according to one or more of claims 1 to 10, characterized in that the aperture cross-section is formed in a T shape (37g).
15. The interlacing device according to one or more of claims 1 to 10, characterized in that the aperture cross-section is formed in an X shape (37c).
16. The interlacing device according to one or more of claims 1 to 15, characterized in that the air-blow nozzle (37a;37b;...;37q;37/1;37/2;37/3) is inclined at an angle δ which is in a range of 60° ≤ δ ≤ 90°, preferably 75° ≤ δ ≤ 87°, with respect to the longitudinal central axis (26).
17. The interlacing device according to one or more of claims 1 to 15, characterized in that the air-blow nozzle (37a;37b;...,37q;37/1;37/2;37/3) is inclined at an angle δ < 60° with respect to the longitudinal central axis (26).
18. An interlacing process for at least one multifilament yarn the filaments of which are interlaced in a yarn passage by means of a medium stream, particularly a compressed-air stream, wherein the medium stream is divided into a main stream and a pair of secondary streams with the main stream being introduced into the central area of the yarn passage and one of the secondary streams being introduced in one external area and the other of the secondary streams being introduced into the other external area of the yarn passage, characterized in that the the main and secondary streams are substantially directed in the same direction.
19. An interlacing process according to claim 18, characterized in that the main stream (H) carries the major volume stream as compared to each of the two secondary streams (N).
20. A process according to any one of claims 18 or 19, characterized in that the width of the central area (29) with respect to the external areas (33) is determined by means of the main stream (H).
21. The process according to one or more of claims 18 to 20, characterized in that the magnitude of the secondary streams (N) with respect to the main stream (H) is matched such as to reduce the period of time during which the filaments are in the external areas (33) of the yarn passage (13) so that open yarn points which are not interlaced are restricted to certain magnitudes.
22. The process according to one or more of claims 18 to 21, characterized in that the secondary streams (N) come to act on the yarn to be interlaced in a manner locally separated from the main stream (H).
23. The process according to claim 22, characterized in that the pair of secondary streams (N) come to act on the yarn to be interlaced substantially prior to the main stream (H).

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