GB2337767A - Jet texturing nozzle and baffle device - Google Patents

Abstract

The baffle device 26 has a first plane face and a second rounded face. The air stream 33 and the yarn 32 are deflected roughly at right angles by the first plane face upon exiting the texturing duct TK. After the transition from the first plane face into the second rounded face, the yam path and the air stream are separated. An extended path is formed round the baffle device for the yarn. The direction of the issuing air and of the yarn take off are therefore opposite. The intensity of texturing is very high. Compact yarns with regular loop formation are achieved even with very high yarn titres.

Description

1 2337767 Jet texturing nozzle and baffle device for a jet texturing

nozzle The invention relates to a jet texturing nozzle with a continuous yarn duct, a compressed air duct opening into the yarn duct and a baffle device arranged at the outlet end of the yarn duct, and to a baffle device for a jet texturing nozzle.

During the processing and use of textured multifilament yarns, the cohesion of the individual filaments with one another plays an important part. Yarns with good internal cohesion are easy to process and have higher resistance to abrasion.

This results in a higher useful value of the yarns, for example as sewing threads or for the textile fabrics produced with the yarns. A typical feature of textured multifilament yarns is that filaments project visibly from a core part of the thread and are shaped into loops. The form and distribution of the loops projecting from the thread are important for the appearance and textile feel of the products.

The form and distribution of the loops are determined in part by the type of yarns used and the settings. However, j et texturing systems make a significant contribution to this. A system should be able to form the loops and place the projecting loops as closely as possible onto the core part of the thread. The uniform distribution of the filaments in the yarn assembly is also important and is responsible, among other things, for the uniformity of the distribution of colour components in yarns produced from feed yarns with filaments of different colours or with filaments with different affinity for dyes. Such yarns are used, for example, for producing seat coverings.

good texturinS uniformlv A perfectly operating jet texturing system is expected to produce a uniform compact texture even with a high yarn overfeed. The yarn overfeed is calculated from the ratio of 2 yarn feed rate into the texturing system to the take-off rate, more specifically for each individual yarn strand supplied to the nozzle. For yarns which are highly overfed there are supplied two or more multifilament yarns or strands, for example a core yarn or standing yarn is supplied with an overfeed of 1.03 to 1.2 and at least one effect yarn strand with an overfeed of 1.2 to 4.

With regard to the construction of the jet texturing nozzle, there is a number of parameters which can influence the quality of the end product directly and individually as in the cooperation. Therefore, it is not surprising that a good solution has been sought and found from various sides. It has been found in practice that quite different measures, whether in the region of the internal construction or of the baffle member at the outlet of air and yarn from the continuous yarn duct of the jet texturing nozzle, produce some similar or even identical effects on the quality of texturing. In the interior of the jet texturing nozzle there is an annular chamber through which compressed air is blown and into which a needle projects. The yarn duct f or the supply of the yarn into the annular chamber passes through the needle. US-PS No. 4 157 605 proposes a needle length within the range of 9.5 to 16.5 mm. Attempts have also often been made to optimize the operating space directly at the outlet after the needle -into the annular chamber.

on the other hand, EP 485 328 proposes a thread guide pin on the baffle member itself for guiding the yarn issuing from the nozzle. The thread guide pin is to deflect the yarn from a central plane.

In US-PS 4 157 605, the baffle member is designed as a pendentive flap, and a roughly right-angled deflection is obtained both for the air stream and the yarn path. The yarn is taken off in a transverse plane with respect to the continuous yarn duct.

3 US-PS No. 3 881 231 also proposes that the textured yarn be taken off in a transverse plane. The yarn is guided via a cylindrical baffle device immediately after issuing from the continuous yarn duct. With respect to an imaginary axis of the yarn duct, the textured thread can easily be deflected into an opposing direction beforehand. The cylindrical form can be flat over a short length in the last portion before the yarn leaves the baffle device. One aim of this solution is to influence both the yarn path and the compressed air stream by the cylindrical form and to guide them with one another. This results in a higher speed of operation and also a greater round configuration of the textured yarn.

Recent experience has shown that the positive results in the state-of-theart have been achieved mainly with finer yarns. With coarser yarns, production has to be carried out at a relatively low speed of yarn conveyance as the result is not otherwise satisfactory with respect to quality.

It is accordingly an object of the invention to improve generic jet texturing nozzles such that compact yarns can be produced with regular loop formation and relatively few flames even at high production rates.

A jet texturing nozzle according to the invention is characterized in that the baffle device has a first plane face and a second rounded face in the direction of yarn travel, the baffle face being.arranged directly opposite the outlet end of the yarn duct in such a way that the air stream and the yarn are deflected substantially at right angles and an extended yarn path round the baffle device is formed. Reference is made to claims 2 to 12 for particularly advantageous further embodiments.

As will be explained hereinafter with reference to examples, good results could be achieved even with simple forms. It has 4 surprisingly been found that the solution according to the invention produced the best results in combination with the formerly known good nozzle designs. The reasons for the positive effects could not be found with certainty. However, the inventor has recognized that state-of-the- art texturing was excessively restricted to the theoretical model of texturing. Texturing begins thereby in the interior of the jet texturing nozzle at the position where the yarn is combined with the compressed air stream and is passed in a widening nozzle duct to the braiding point in the region of the nozzle outlet. It has been found according to US-PS 3 881 231 that a good effect is achieved if the compressed air follows the textured yarn by a short distance. However, this robs the baffle device of its actual function, namely the baffle function. A mere deflecting function is performed instead of the baffle function. The novel invention accordingly proposes that the actual baffle function be maintained. For this purpose, both the compressed air stream and the yarn are deflected after the baffle position on the baffle device approximately at right angles with respect to the continuous yarn duct.

compressed air stream and preferably by 900 to 1800, The yarn then moves from the is guided at least by 9oO, round the rounded face of the baffle device. The compressed air can issue freely on one side. It is assumed that the extended frictional contact in particular between the yarn and the first rounded face substantially helps to produce a compacter yarn with even loops and relatively few flames according to the invention.

The new invention allows quite a number of particularly advantageous embodiments. The plane face may be arranged at an acute angle in the range of 40 to 200 with respect to a transverse plane to the yarn duct for the operating position. The treatment chamber therefore opens in the f orm of a v and is preferably closed on the opposite side in the operating position. As a result, the compressed air stream initially moves jointly in the same direction as the yarn. The entire i baffle device with the two faces is advantageously fastened pivotally on the nozzle member so a treatment chamber which widens on one side is formed in the operating position and the outlet end of the yarn duct is cleared in the threading position. The baffle face projects (as viewed transversely to the yarn duct) at its orifice preferably in parts of roughly similar size in the direction of travel of the yarn and in the opposite direction. In a particularly preferred embodiment, the yarn path contacts the plane face over at least about 10%.

In a further embodiment, the baffle device has a first plane face, a second rounded face and a third, immediately adjoining third rounded guide face. The two rounded faces each extend roughly over a quarter circle. The radius of the second rounded face is significantly greater than the radius of the third guide face. When viewed perpendicularly to a transverse plane of the yarn duct, the f irst plane face and the second rounded face together have roughly a length in the example corresponding to the width of the baffle face. The width of the baffle face is preferably at least as great as the greatest dimension of the outlet orifice from the yarn duct. The baffle device is preferably designed and arranged in such a way that the yarn path is deflected at the outlet end of the yarn duct roughly at right angles to one side, round the baffle device and then round 1800 into the opposite direction with respect to the first deflection. The baffle device can additionally have a thread guide pin or a guide groove, pref erably at the end of the rounded baf f le f ace or in the region of the guide f ace and acts as a stable yarn guide, possibly as a slight lateral deflection of the yarn. It is also desira ble if the baffle device is fastened in the manner of a f lap so as to form a slightly projecting rounded grip face on which the baffle device can be folded open and closed into the threading or operating position by hand or by a finger.

6 Further advantageous effects have been achieved by combining the novel solution with the construction of an entire jet texturing nozzle according to EP 441 925. This document is explained as an integrating component of the present application. EP 411 925 comprises a cylindrical baffle member round which the textured yarn is guided roughly over a semicircle. Experiments have shown that the head part of the novel solution with the baffle member can be used or exchanged instead of the corresponding body of said state-of-the-art solution. A further increase in the quality of texturing has been achieved if the length of the needle extends by about 6 to 20 mm into the annular chamber through which the compressed air is blown. It has been found that the quality of texturing can be positively influenced both by the constructional measures in the region of the needle, that is before the actual texturing zone, and in the region after the texturing zone or after the braiding point.

The invention also relates to a baffle device for a jet texturing nozzle with a continuous yarn duct and a compressed air duct which opens into the yarn duct for arrangement at the outlet end of the yarn duct and is characterized in that the baffle device has, in the direction of yarn travel, a first plane face and a second rounded face, the baffle face being arranged directly opposite the outlet end of the yarn duct such that the air stream and the yarn is deflected substantially at right angles and an extended yarn path is formed round the baffle device.

Embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:

Figures la and 1b show - known air jet texturing devices.

Figure 2a shows the head part of a jet texturing nozzle with a baffle device according to the invention.

7 Figure 2b shows a baffle member according to Figure 2a.

Figure 3a shows an entire jet texturing nozzle, partially in section, as a view A in Figure 3b.

Figure 3b shows the jet texturing nozzle from Figure 3a in a view along arrow B, also partially in section.

Figure 4a is a cross section corresponding to arrow III in Figure 3a.

Figure 4b is a cross section corresponding to arrow IV in Figure 3a.

Figure 4c is an enlarged detail from Figure 3a.' Figure 4d is a cross se'ction corresponding to arrows VI-VI in Figure 4c.

Figures Sa to 8 show various embodiments of the baffle device.

Figures 9a to 9d show various comparisons between old and new products.

Figures la and 1b show the state-of-the-art, Figure la representing the theoretical model of texturing. When observing the corresponding model, the braiding zone in the outlet region 21 from the texturing nozzle represents the central function with the so-called braiding point F. The braiding point F can be outside a surge stream (dotted), as shown in Figure la. State-of-the-art texturing is assumed to have been completed just after the braiding point F. Figure 1b shows a different embodiment of a jet texturing nozzle in which a baffle device 20 is arranged directly in front of the outlet region 21 of the texturing nozzle TD. The textured yarn Gtex is guided round the baffle device 20 and is taken 8 off in a plane E located substantially transversely to a centre line M of the yarn duct 4. 21x denotes the maximum dimension at the conical outlet region of the texturing nozzle TD.

The system shown schematically in Figures 3a, 3b and 4a to 4d for the jet texturing of a multifilament yarn (or simultaneously of two or more multifilament yarns) has a guide member 1 which consists, for example, of ceramic material and contains a continuous bore for the passage of multifilament yarn and blowing medium. This bore has a conical portion 2 on its inlet side. In the conventional manner, the vertex angle of the cone shape lies between 30 and 1200, for example at about 600 as shown. The device also has a needle member 3 which contains a continuous yarn duct 4 orientated roughly coaxially with the bore of the guide member 1. The needle member 3 extends with its end into the conical portion 2 of the bore of the guide member 1 and has, at this end, a conical peripheral face 5 which forms with the wall of the conical portion 2 a through gap 6 for the blowing medium.

The through gap 6 must have a precisely predetermined width and is in a specific ratio to the narrowest point 70 of the Venturi nozzle (Figure 2a) Depending on the yarn to be textured, this lies roughly in the range of about 0.12 to 0.4 MM. To guarantee this precisely predetermined width of the through gap 6, the axial position of the guide member 1 is f ixed with respect to the needle member 3 in that the guide member 1 and the needle member 3 are pressed axially against one another by a f orce. In the embodiment illustrated, the guide member 1 and the needle member 3 are guided with their peripheral faces in a cylindrical sleeve 7 and contact one another over a circular face 8. However, it is also possible to arrange, for example, a washer of predetermined thickness which may be exchangeable on the circular face 8 between the two members 1 and 3. The annular contact f ace 8 can also be conical in order to centre the two members 1 and 3 relative to 9 one another. The guide member 1 rests on a flange 7.1 of the sleeve 7 whereas the needle member 3 is held in a housing 9 guided on the exterior of the sleeve 7, preferably by a bayonet fitting. For this purpose there fits in a bore in the housing 9 a pin 10 which extends in a bore in a flange 7.2 of the sleeve 7 so as to prevent a rotation of the housing 9 with respect to the sleeve 7. Compression springs 11 and 12 (Figures 3b, 4a) which rest on the flange 7.2 of the sleeve 7 and press the sleeve 7 to the right with respect to the housing 9 in Figures 3a and 3b are arranged in two further bores in the housing 9. A connecting line 14 lea ' ds f rom a compressed air connection 13 in the housing 9 to the left-hand side of the f lange 7.2 acting as a piston so the pressure of the air jet supplied also presses the sleeve 7 to the right with respect to the housing 9. The connecting line 14 is not shown in Figure 3a but its position is indicated here by a dot-dash line. The guide member 1 resting on the flange 7.1 of the sleeve 7 is pressed by an elastic force against the needle member 3 held in the housing 9. The compressed air connection 13 of the housing 9 communicates via a lateral orifice 15 in the sleeve 7 with a peripherally extending recess 16 in the needle member 3. A feed bore 17 for the air jet, which is parallel to the axis, issues from this recess 16 and opens into the annular space 18 surrounding the needle member 3 before the through gap 6. A bush 19 consisting of hard metal or ceramic material can be arranged in the feed bore 17 and, as shown in Figure 2, has a rounded inlet rim.

In the embodiment illustrated, the needle member 3 is held in the housing 9 by means of a bayonet fitting, as already mentioned. The needle member 3 carries two radial projections 59 and 60 which grip behind inwardly directed radial projections 61 and 62 of a bayonet ring 63 held in the housing 9. The bayonet ring 33 is arranged releasably in the housing 9 and held by means of a snap ring 64.

As shown in Figure 4, the projection 61 of the bayonet ring 63 is wider when measured in the circumferential direction than the projection 62. The projections 59 and 60 of the needle member 3 are spaced from one another on one side (right in Figure 4b) by a distance corresponding to the width of the projection 61 and, on the other side (left in Figure 4b), by a smaller distance corresponding to the width of the projection 62. Therefore, the needle member 3 can only be inserted in a position in which the greater distance between the projections 59 and 60 is orientated toward the wide projection 61 and is then rotated through about 900, preferably 1800, into the illustrated position. This rotation is limited to 900 or 1800 by stops 59.1 or 60.1 which are arranged on the projections 59 and 60 and cooperate with the projections 61 and 62. To enable the needle member 3 to be inserted in the position rotated through 900 or 1800, the bayonet ring 63 has to be removed from the housing 9 (after removal of the snap ring 64) and has to be inserted back into it after rotation through 1800. The two positions of the bayonet ring 63 rotated through 1800 to one another are fixed by a cam 63. 1 on the bayonet ring 63 which is held in one of two diametrically opposed recesses 9.1 or 9.2 in the housing 9.

Figure 4c shows a detail from Figure 1 on an enlarged scale as a variation. In this variation, the needle member 31 also makes direct contact with the guide member 1. However, the needle member 31 does not contact the end face of the guide member 1 but the wall of the conical bore portion 2. Peripherally distributed projections 3.1, 3.2, 3.3 which rest on the wall of the conical bore portion 2 are arranged on the conical peripheral face 5 of the needle member 31. Therefore, the width of the through gap 6 between the peripheral face 5 and the wall of the bore portion 2 corresponds exactly to the height of the projections 3.1, 3.2, 3.3. The axial position of the guide member 1 is f ixed with respect to the needle member 3; 31 such that the guide member 1 and the needle member 3; 31 are axially pressed against one another by a force, a feed bore 17 for the blowing medium opening into the annular chamber 18 surrounding the needle member 3; 31 before 11 the through gap 6 and a baffle member 20 being held on the outlet side of the bore of the guide member 1. The needle member 3; 31 is guided displaceably in a sleeve 7 and is held by a bayonet f itting 59, 60, 61, 62 in a housing 9 which is axially displaceable on the sleeve 7. The above-mentioned force is produced by springs 11, 12 acting between the housing 9 and the sleeve 7 and, during operation, by the pressure of the blowing medium which acts between the housing 9 and a flange 7.2 on the sleeve 7.

Reference is made hereinafter to Figures 2a and 2b. Figure 2a is a functional diagram of the novel invention. on the head part 22 of the texturing nozzle there is fastened an entire baffle head 23 on which the baffle device 20 is articulated via a pivot pin 24. The dot-dash line 25 shows the baffle member 26 hinged open in the threading position. The thick solid line shows the baffle member 26 in the operating position in which the textured yarn Gtex is guided round the baffle member 26. The baffle member 26 is shown again individually in Figure 2b with the most important physical features. The entire baffle member 26 is flat in design, as can also be seen in particular in Figures 5b and 6b. The working faces are formed by a first plane face 27 and a second rounded f ace 28 which passes into a guide face 29 which is also rounded. It will be appreciated that all working faces have a very high surface quality and that at least the corresponding parts have to be produced from highly wearresistant material. In the example shown in Figure 2a, a core yarn and an ef f ect yarn are introduced into the yarn duct 4 and guided through the needle 31 into the texturing duct TK. The texturing process begins immediately at the outlet end of the needle 31, is continued in the narrowest point of the Venturi part 70 and in an adjoining conically enlarged duct piece 30 up to the main braiding work in the region of the braiding point F. The region of the braiding point F is at the same time also the baf f le position 31 of the air stream 12 from the duct piece 30 and also of the two thoroughly mixed core and effect yarns.

In the example, the baffle position 31 is located in the central region of the first plane face 27. From the baffle position 31, the braided yarn is first guided over the first plane face 27 then over the second rounded face 28 and finally over the third rounded guide face 29. With very coarse yarns, the quality is best if the yarn path over the first plane face 27 and the yarn path over the second rounded face 28 is as long as possible. The length of the second rounded face 28 is greater, the greater the radius R. Optimum values could be achieved if the second rounded face 28 corresponds roughly to a quarter circle. If the second rounded face 28 is enlarged over a semicircle, for example according to Figures Sa and 6a, the quality of texturing is further increased slightly. As the baffle member is produced in material which is highly resistant to wear, the third rounded face can be provided in many cases with a radius which is only about half as great, in order to save material accordingly. Optimum values could be determined in many series of tests if the texturing duct TK is in a ratio to the total length of the yarn path over the first plane face 27 and over the second rounded face 28. The best qualitative values are achieved if the yarn path is longer over the baf f le member than the texturing duct TK up to a factor of over 2. A further important factor is that the yarn take-off according to arrow 32 is directed in the opposite direction to the air outlet direction according to arrow 33. A further interesting advantage is that the baffle member 26 almost contacts the head side 35 of the texturing nozzle at position 34. Therefore, air cannot issue on the corresponding side. The head side 35 therefore forms, with the first plane face 27, A V-shaped orifice for the air stream and the yarn path. The opening angle 0i is preferably between 40 and 200. A distance Ax at the outlet region of the texturing nozzle of 2 to 6 mm is produced (Figure 3b).

the 13 As can be inferred from Figures 3a and 3b and Figures 5 to 8, the operating position of the baffle member 26 is defined by a stop bolt 40 of which the size can optionally be selected and which rests on a stop shoulder 41. It is also possible additionally to arrange a guide pin 42 or a guide groove 71 on the baffle member 26 for stable guidance and optionally easy lateral deflection of the textured yarn by an amount X (Figure 3a).

Figures, Sa to 8 show a few variations with respect to the baffle member 26. In addition to the different dimensions of the rounded faces, the measurement EPI... EP1111, in particular, is also varied. These are different respective operating lengths on the plane face 27. The operating position and threading position of the baffle member is maintained by a spring-catch system 43.

A strong compression spring 44 presses a ball 46 via a straining screw 45 onto a pressure face 47 of a pivot pin 48 rigidly connected to the baffle member 26. The pivot pin 48 is in turn non-movably fixed in the baffle member 26 by a pointed screw 49. In Figure 5b, the entire length of the face duct 4). The width of the baffle member 26 is indicated by B. In the examples illustrated, the head part 22 has, only on one side, a side wall 50 in which, on the one hand, the pivot pin 48 is rotatably mounted and, on the other hand, forms the stop shoulder 41 for the stop bolt. In a first investigation, the four different baffle members 26, 261, 2611, 261 1 1 have been tested up to a maximum yarn speed of 500 and more m/min.

baffle member 26 is observed by Lp in a projecting (corresponding to a face which is transverse to the yarn 14 values for the basic-setting Core: PES dtex 167f72xl 100_.

Effect: PES dtex 167f72x2 7501 Speed: 350 m/min Pressure: 9 bar Figure 9a shows a comparison between a textured yarn according to the state-of-the-art (standard baffle device) and a novel baffle device according to the invention. The best results have been achieved with a solution according to Figure 5a, that is with the maximum radius R and the maximum yarn path length EP' on the first plane face. Even a black and white reproduction of a yarn pattern in a two-dimensional illustration clearly demonstrates the difference. The yarn produced with a jet texturing nozzle according to the invention is textured more evenly and more compactly.

The results of Figures 9a to 9d are also logical. The following settings and values apply:

Figure 9b; values for the basic setting (PP --) polypropylene) Core:

Effect:

Speed:

Final titre 2300 den PP den 330/60x2 10-015 PP den 300x60x2 18506 W2 200m/min Figure 9c; values for the basic setting Core: PP den 300/60x2 100k Effect: PP den 300/60x3 750-6 Speed: W2 200m/min Final titre 2300 den Figure 9d; values for the basic setting Core: Effect:

PP den 1200/256xl 10% PP den 12000/256xl 200% PP den 300/60x2 W2 90m/min 7000 den Speed: Final titre On the basis of the former test results, the novel invention allows a significant improvement in the compactness of the yarn and/or an increase in the yarn conveyance speed of 250-h to 300k and sometimes even more, at least with finer yarns. The novel invention allows an improvement in and stabilization of process control during production of correspondingly textured yarns.

1-, 16

Claims (18)

Claims

1. Jet texturing nozzle with a continuous yarn duct, a compressed air duct opening into the yarn duct and a baf f le device arranged at the outlet end of the yarn duct, characterized in that the baffle device has. a first plane face and a second rounded face in the direction of yarn travel, the baffle face being arranged directly opposite the outlet end of the yarn duct in such a way that the air stream and the yarn are deflected substantially at right angles and an extended yarn path round the baffle device is formed.

2. Jet texturing nozzle according to claim 1, characterized in that the plane baffle face is arranged at an acute angle to a transverse plane with respect to the yarn duct for the operating position-

3. Jet texturing nozzle according to claim 1 or 2, characterized in that the baffle device is pivotally fastened on the nozzle member in such a way that a treatment chamber which widens at one end is formed in the operating position and a total clearance of the outlet end of the yarn duct in the threading position, the treatment chamber being v-shaped and closed at one end in the operating position.

4. Jet texturing nozzle according to one of claims 1 to 3, characterized in that the two baffle faces, when viewed transversely to the yarn duct, project at the orifice thereof by substantially similarly equal amounts in the direction of yarn travel and in the opposite direction, the yarn path preferably contacting the plane baffle face over at least about 10. 01;.

1-- 1.

17

5. Jet texturing nozzle according to one of claims 1 to 4, characterized in that the baffle device has a first plane baffle face, a second rounded baffle face and a third immediately adjoining rounded guide face.

6. Jet texturing nozzle according to claim 5, characterized in that the two rounded faces each extend roughly over a quarter circle, the radius of the rounded baffle face being substantially greater than the radius of the rounded guide face.

7. Jet texturing nozzle according to claim 6, characterized in that, when viewed perpendicularly to a transverse plane of the yarn duct, the plane baffle face and the rounded baffle face together produce roughly a length corresponding to the width of the baffle face.

8. Jet texturing nozzle according to claims 1 to 7, characterized in that the baffle device is so designed and arranged that the yarn path at the outlet end of the yarn duct is deflected roughly at right angles to one side, is guided round the baffle device and is then deflected by 900 to 1800 with respect to the first deflection into the opposite direction.

9. Jet texturing nozzle according to claims 1 to 7, characterized in that the baffle device has a thread guiding pin which is arranged in the direction of travel of the yarn preferably at the end of the rounded baf f le face or in the region of the guide face, for easy lateral deflection of the yarn.

10. Jet texturing nozzle according to claims 1 to 9, characterized in that the baffle device is flap-like in design so as to form a slightly projecting rounded grip face on which the baffle device can be folded open and closed by hand or by a finger for the threading or operating position.

18

1 1. Jet texturing nozzle according to one of claims 1 to lo, characterized in that the needle member (3; 31) is displaceably guided in a sleeve (7) and is held by a bayonet fitting (29, 30, 31, 32) in a housing (9) which is axially displaceable on the sleeve (7), and a force is produced by springs (11, 12) acting between the housing (9) and the sleeve (7) and by the pressure of the blowing medium during operation which acts between the housing (9) and a flange (7.2) on the sleeve (7).

12. Jet texturing nozzle according to one of claims 1 to 11, characterized in that the needle extends by about 8 to 20 mm into the annular chamber via which the compressed air is blown in and the untreated yarn is introduced.

13. Baffle device for a jet texturing nozzle with a continuous yarn duct and a compressed air duct which enters the yarn duct for arrangement at the outlet end of the yarn duct, characterized in that the baffle device has a first plane face and a second rounded face in the direction of yarn travel, the baffle face being arranged directly opposite the outlet end of the yarn duct in such a way that the air stream and the yarn are deflected substantially at right angles and an extended yarn path round the baffle device is formed.

14. Baffle device according to claim 13, characterized in that it comprises a thread guide pin or guide groove arranged at the end of the rounded face or directly---thereafter.

I- -

15. A jet texturing nozzle for texturing yarn, comprising a yarn duct and a baf f le arranged at the outlet of the yarn duct, the baffle having a first face for deflecting both yarn and a gas or air stream exiting the duct and a second f ace at which the gas or air stream and the yarn separate, the arrangement being such as to avoid or inhibit flame effect in the yarn.

16. A jet texuring nozzle for texturing yarn, comprising a yarn duct and a baf f le arranged at the outlet of the yarn duct, the baffle having a first planar face and a second curved or rounded face defining a yarn path for def lecting both yarn and a gas or air stream exiting the duct.

17. A baffle for a jet texturing nozzle for texturing yarn,' the baf f le being locatable at the outlet of a yarn duct of a jet tex.turing nozzle and having a first face for deflecting both yarn and a gas or air stream exiting the duct and a second f ace at which the gas or air stream and the yarn separate.

18. A baffle for a jet texturing nozzle for texturing yarn, substantially as hereinbefore described with reference to Figures 2a to 8 of the accompanying drawings.

18. A baffle for a jet texturing nozzle for texturing yarn, the baffle being locatable at the outlet of a yarn duct of a jet texturing nozzle and having a first planar face and a second curved or rounded face defining a yarn path for def lecting both yarn and a gas or air stream 20.

exiting the duct.

19. A jet texturing nozzle for texturing yarn, substantially as hereinbefore described with reference to Figures 2a to 8 of the accompanying drawings.

20. A baffle for a jet texturing nozzle for texturing yarn, substantially as hereinbefore described with reference to Figures 2a to 8 of the accompanying 10 drawings.

1 11 Amendments to the claims have been filed as follows 1. Jet texturing nozzle with a continuous yarn duct, a compressed air duct opening into the yarn duct and a baffle device arranged at the outlet end of the yarn duct, wherein the baffle device has a first plane face and a second rounded face both in the direction of yarn travel, the first and second baffle faces being arranged directly opposite the outlet end of the yarn duct in such a way that the air stream and the yarn are deflected substantially at right angles and an extended yarn path around the baf f le device is f ormed by said f irst and second faces.

2. Jet texturing nozzle according to claim 1, wherein the plane baffle face is arranged at an acute angle to a transverse plane with respect to the yarn duct for the operating position.

3. Jet texturing nozzle according to claim 1 or 2, wherein the baffle device is pivotally fastened on the nozzle member in such a way that a treatment chamber which widens at one end is formed in the operating position and a total clearance of the outlet end of the yarn duct in the threading position, the treatment chamber being V-shaped and closed at one end in the I:L operating position.

4. Jet texturing nozzle according to one of claims 1 to 3, wherein the two baffle faces, when viewed transversely to the yarn duct, project at the orifice thereof by substantially similarly equal amounts in the direction of yarn travel and in the opposite direction, the yarn path preferably contacting the plane baffle face over at least about 10%.

5. Jet texturing nozzle according to one of claims 1 to 4, wherein the baffle device has a first plane baffle face, a second rounded baffle face and a third immediately adjoining rounded guide face.

6. Jet texturing nozzle according to claim 5, wherein the two rounded faces each extend roughly over a quarter circle, the radius of the rounded baffle face being substantially greater than the radius of the rounded guide face.

7. Jet texturing nozzle according to claim 6, wherein, when viewed perpendicularly to a transverse plane of the yarn duct, the plane baffle face and the rounded baffle face together produce roughly a length corresponding to the width of the baffle face.

8. jet texturing nozzle according to claims 1 to 7, wherein the baffle device is so designed and arranged that the yarn path at the outlet end of the yarn duct is deflected roughly at right angles to one side, is guided round the baffle device and is then deflected by 90' to 180' with respect to the first deflection into the opposite direction.

4 9. Jet texturing nozzle according to claims 1 to 7, wherein the baffle device has a thread guiding pin which is arranged in the direction of travel of the yarn preferably at the end of the rounded baffle face or in the region of the guide face, for easy lateral deflection of the yarn.

10. Jet texturing nozzle according to claims 1 to 9, wherein the baffle device is flap-like in design so as to form a slightly projecting rounded grip face on which the baffle device can be folded open and closed by hand or by a finger for the threading or operating position.

11. Jet texturing nozzle according to one of claims 1 to 10, wherein the needle member (3; 3') is displaceably guided in a sleeve (7) and is held by a bayonet fitting (29, 30, 31, 32) in a housing (9) which is axially displaceable on the sleeve (7), and a force is produced by springs (11, 12) acting between the housing (9) and the 214 sleeve (7) and by the pressure of the blowing medium during operation which acts between the housing (9) and a flange (7.2) on the sleeve (7).

12. Jet texturing nozzle according to one of claims 1 to 11, wherein the needle extends by about 8 to 20 mm into the annular chamber via which the compressed air is blown in and the untreated yarn is introduced.

1 1 10 : 1 11 13. Baffle device for a jet texturing nozzle with a continuous duct and a compressed air duct which enters the yarn duct for arrangement at the outlet end of the yarn duct, wherein the baffle device has a first plane face and a second rounded face, both in the direction of yarn travel, the first and second baffle faces being arranged directly opposite the outlet end of the yarn duct in such a way that the air stream and the yarn are deflected substantially at right angles and an extended yarn path around the baffle device is formed by said first and second faces.

14. Baffle device according to claim 13, wherein it comprises a thread guide pin or guide groove arranged at the end of the rounded face or directly thereafter.

1 -1(- 15. A jet texturing nozzle for texturing yarn, comprising a yarn duct and a baf f le arranged at the outlet of the yarn duct, the baffle having a first plane f ace f or def lecting both yarn and a gas or air stream exiting the duct and a second rounded face at which the gas or air stream and the yarn separate, the arrangement being such as to avoid or inhibit flame effect in the yarn.

16. A baffle for a jet texturing nozzle for texturing yarn, the baffle being locatable at the outlet of a yarn duct of a jet texturing nozzle and having a first plane face for deflecting both yarn and a gas or air stream exiting the duct and a second rounded face at which the gas or air stream and the yarn separate.

17. A jet texturing nozzle for texturing yarn, substantially as hereinbefore described with reference to Figures 2a to 8 of the accompanying drawings.