GB2307249A

GB2307249A - Effect yarn

Info

Publication number: GB2307249A
Application number: GB9620263A
Authority: GB
Inventors: Jakob Bebie; Gotthilf Bertsch; Kurt Klesel; Christian Simmen; Peter Stern
Original assignee: Heberlein and Co AG; Heberlein Maschinenfabrik AG
Current assignee: Heberlein AG; Heberlein and Co AG
Priority date: 1995-11-17
Filing date: 1996-09-27
Publication date: 1997-05-21
Also published as: GB9620263D0

Abstract

A textured, continuous filament yarn 1 a having external loops is run over a stationary support 8 while loops on a yarn side opposite the support are severed by rotating cutting or grinding wheel 9 to form short projecting ends on that yarn side. The yarn may have been air jet-textured. A fabric made from the yarn is said to have a soft handle.

Description

Method and device for producing a spun yarn effect, in particular in air jet-textured yarn Technical field The invention relates to a method and a device for producing a spun yarn effect in yarn, in particular in air jet-textured yarn, comprising a core and an external loop structure.

State of the Art The filament yarn or continuous filament yarn differs, after production, very markedly from spun yarn comprising staple fibres of natural fibres such as wool or cotton. A fabric made of unfinished filament yarn is smooth and feels cold. Attempts have therefore been made since the 50s to finish the filament yarn.

Air jet-texturing is a known method. The smooth filament yarn is guided through an air jet-texturing nozzle and a loop yarn is produced. Such a method and an air jet-texturing nozzle are shown in EP-PS No. 88 254. A variety of yarn qualities can be produced depending on the method of controlling the texturing process and the quality of the untreated smooth yarns or of the starting material. For example, many relatively small loops can be formed over a compact core. A fabric having high slippage resistance and a slide-preventing effect is formed in this way.

Ski clothing and rucksack materials are known applications of such a yarn. However, it is also possible to produce a so-called bulk yarn. In this case, the starting material is a standing yarn and an effect yarn; a compact core and many large loops are produced. A good covering capacity in the sheet configuration of the textile material is obtained with the bulk yarn. Good resistance to pilling and high abrasion resistance make this quality suitable for the production of car seat covering materials. A third texturing quality is the so-called soft yarn with a loose loop structure. The yarn is soft and has a compact core. Any larger loops are pulled out by a drawing process.

Despite the great variety in yarn qualities, it is often impossible to obtain a group of quite specific quality features in the same product. In certain applications of air jet-textured yarns, for example, the burr effect produced by the loops is undesirable. It is sometimes desirable for the fabric to have a soft handle without the properties of the soft yarns. In some applications, the rustling which is also caused at least in part by the loop structure is undesirable. The conflict is due to the fact that the effect of the air jet-texturing process, namely the loop structure, is desired in many cases but without the drawbacks of the loops.The advantages of the spun effect are therefore sought for many applications, these advantages residing, among other things, in the fact that many ends of the staple fibres project freely from the yarn and are advantageous, for example, for the handle, the thermal effect and the covering capacity.

GB Document No. 633 115 accordingly proposes that individual filaments in a yarn be broken by frictional contact with an abrasive surface and that nubs or curls be produced by a to and fro movement of the abrasive surfaces. It is not known whether this solution has been adopted in practice.

A more recent proposal is described in DE-PS No. 32 10 784. It is proposed therein that the textured yarn provided with loops, bends, arcs and the like be guided over one or more rotatable rollers mounted in succession in the yarn path in at least one turn, that the yarn run supplied to the rollers cover the yarn run issuing from the rollers preferably in its edge region and, in so doing, clamp and open the loops, bends, arcs and the like projecting from the yarn core of the issuing yarn run on the roller. Rollers which are provided with a rough surface on the outer edge can also be used. In a further embodiment, of the type shown in DE-PS No. 35 35 085, attempts are made to aspirate the separated filament pieces in a lint catcher. This solution is still met here and there in practice.Contrary to expectation, however, the desired uniform effect is often not achieved or at least not satisfactorily achieved. A significant drawback of the two solutions is that the tearing of the loops cannot be industrially controlled. The intensity of loop opening can be influenced by tauter guidance and optionally special design of the abrasive surfaces but it is not possible, for example, to control the tear points. In terms of tools, it is difficult to process an individual yarn with the solutions of the prior art. For the plurality of yarn qualities of random count, only some of which have been described at the outset, however, there are far too few methods of achieving a reproducible effect with a controlled mechanical intervention.

statement of the invention It was accordingly the object of the invention to treat air jet-textured yarn, in particular, in such a way that, on the one hand, the advantages of the texturing process are retained as far as possible but on the other hand a spun yarn effect is achieved or achieved at least to a great extent and maintained. In particular, however, a desired spun yarn effect should be gradually adjustable.

The method according to the invention is characterized in that the yarn is guided over a processing support and the loop structure of the yarn is reduced to a pre-adjustable depth with a grinding or cutting tool on the side remote from the processing support.

The device according to the invention is characterized in that it has a processing point formed by a processing support and a preferably motor driven grinding or cutting tool as well as microadjusting means for adjusting the depth of processing.

The inventors have recognized that the prior art is usually based on a theoretical model of yarn processing. As a spun yarn has ends of the staple fibres projecting "all round", this became the desired aim. However, the mechanical "all-round processing" of a yarn is very difficult particularly if an enormous number of individual projecting parts or loops are to be opened. Attempts were made to achieve this manually by rubbing and tugging the entire external surface. The aim of opening a proportion of the loops in textured yarns could be achieved but by an uncontrollable method. Good adjustments established for a particular yarn cannot be transferred to another yarn in any way.

On the contrary, the novel invention proposes that the yarn be reduced to a specific thickness from one side. Two facts allow one-sided reduction with respect to textured yarns. On the one hand, the loops of a textured yarn are rarely orientated only in the longitudinal direction of the yarn. They usually have a helical component. This means that the two filament ends project at different points of the periphery when a loop is cut. The yarn is processed to the fabric in order to produce a fabric with the known entwined course, so the threads alternate continuously.

When two threads lie on one another, one thread side is internally on the fabric or externally on the fabric etc. As a result, the same applies to the freely projecting filament ends produced according to the invention. The effect of the newly formed projecting ends is mainly statistical. Regardless of the point at which the filament ends originally project, these ends have the same effect in the fabric as the projecting ends of staple fibres in spun yarn. It has surprisingly been found that, with respect to reproducibility of the processing of yarns, the novel invention is in no way inferior to the art of industrial grinding or, for example, milling: - the through-rate of the yarn is predetermined; - the processing rate of the tool can be determined independently of the through-rate of the yarn; - the yarn is tensioned so to speak on a defined base, namely the processing support; - the distance between the processing tool and the processing support is numerically adjustable with very high precision.

The object for each particular yarn quality is merely to determine the optimum adjusted values so an identical result can invariably be achieved with random repetition.

The novel invention allows a number of very advantageous embodiments. The pull in the yarn is preferably kept constant in the region of the processing support. Processing can be carried out "off line" with respect to texturing. Yarn wound on bobbins can be processed as required. This has the great advantage that a stronger or weaker spun effect can also be produced by the yarn customer for the specific requirement, for example in the context of a simple rewinding process. However, the yarn can also be processed continuously "in-line" from texturing at the processing rate immediately after texturing, the pull in the yarn also being kept constant and preferably being controlled reproducibly after processing.It is particularly preferable to process two threads (or even more) simultaneously according to the invention in parallel, for example corresponding to two positions during texturing or a number corresponding to the winding position during rewinding.

The depth adjustment is carried out in microstages, a partial stage preferably being 10 Am or less. A stage division of 5 pm, for example, is very practical. However, stage divisions of 20 Sm or more are also conceivable. However, as high reproducibility is desired, a value which is as small as possible, of 5 pm or 10 Am, is preferred. It is also possible to process the same yarn twice or more times, preferably with the same grinding or cutting tool. Even during repeated processing, there is no risk that the core or the standing part will be damaged during the second or third processing operation as the processing interval is adjusted exactly and the tools cannot penetrate the core unless they are incorrectly adjusted.

The relative velocity of the grinding or cutting tool relative to the continuously passing yarn should be high, but at least 20% to 50% higher. The relative velocity preferably corresponds to the practice of known plastics or wood processing tools. Tool intervention is controlled not only actively but forcibly as in all corresponding industrial processing operations in the context of a numerically controlled machine tool. The correctness of this statement can be confirmed by experiments in that, for example, when a grinding tool is used, ground dust is produced in particular in addition to individual yarn ends. The experiments have also confirmed that the grinding or cutting tool can move in the same direction as or in the opposite direction to the yarn. Depending on the type of tool, the circumferential velocity of the tool has to be adapted accordingly.Travel in the opposite direction basically allows a deeper tool velocity.

However, it is also possible to distinguish between travel in the same direction or in the opposite direction in concrete cases according to yarn quality particularly when a grinding tool is used. Although processing transversely to the direction of yarn travel is possible, travel in the same direction or in the opposite direction will be more advantageous in the majority of applications. The processing waste is aspirated from the region directly after the processing point, an airstream preferably being produced in the same direction as the direction of thread travel during travel in the same direction, by the aspiration. The apparatus can be used with an inversed travel of the yarn. The aspiration effect is almost the same.

A point which is important in terms of operation is that a stationary thread guide means is preferably arranged at a distance before and after the processing point in such a way that, in the operating state, the yarn is forcibly guided adjacently to the convex grinding support. The grinding support is preferably convex in design. This measure allows not only good thread guidance over the processing support but brings the yarn into an optimum position for intervention of the tool.

Owing to the light "pull round a corner", a larger number of projecting parts or of loops tends to project further so the effect of the tools is better. If two or even more yarns are guided in parallel and simultaneously via the grinding point, the position of the individual yarn can be determined relative to the processing point. A slight lateral pendulum motion can be observed during grinding so a change of position also takes place without a traversing device. The tool is preferably designed, for example, as a grinding wheel which is driven at high velocity, with a diamond covering or as a blade system, the processing width being a multiple of the yarn diameter. A traversing device can be arranged on the thread inlet side for the constant lateral displacement of the processing point.

However, this is not necessary in the majority of cases. The device particularly preferably has numerical adjusting means with microadjustment of the processing depth and rapid disengagement for an open threading position. With regard to operation, it is immaterial whether the tool is adjusted toward the processing support or the processing support to the tool. However, the adjusting means and the disengagement are preferably allocated to the side of the adjustable processing support, disengagement preferably having two positional regions, a completely open catch point and an intermediate position, which automatically moves the processing support into the operating position by spring tension and holds it in an exact operating position.However, the spring tension has a second function in that it serves as a safety element if a foreign body passes between processing support and processing tool. The same applies if the yarn should wind on the tool by accident. Furthermore, the spring eliminates any clearance in the adjusting means. It is almost essential for practical operation for the adjusting means to have a numerical position display for the processing depth, the position display value being a relative reference value which is applicable to identical reproducibility of the processing depth, in particular to the same yarn quality. On the other hand, the new adjustment would have to be sought after each change of product. With the proposed measure, the numerical adjusted values on a data sheet can be taken for the machine adjustment for each particular yarn quality and can be used again with the same precision at any time.

According to a further embodiment, the grinding or cutting tools and the processing support are arranged in a closed housing. The cutting and grinding tool is mounted eccentrically in the housing which has, in the region after the processing point, an aspiration orifice for aspiration of the processing waste. The aspirator is placed at a narrow point between the cutting and cutting tool and the internal peripheral wall of the housing in such a way that the grinding waste is aspirated tangentially from the grinding point into the aspiration orifice. A housing cover can be opened for introduction, and the above-described disengagement of the processing support can be actuated. The housing is preferably designed as a housing block which comprises the thread guide, the processing support with the adjusting means, the grinding or cutting tool and a possible traversing device.The driving motor is mounted directly on the housing block. This allows the device to be installed in any space in the machine. The processing support is preferably produced as a stationary body from highly wear resistant material such as ceramic, however, experiments have shown that the processing support can also be movable in design and can be driven, for example, by the yarn itself.

According to a further proposal, the processing support has a rounded supporting surface, the thread guides being arranged in such a way with respect to the supporting surface that an angle smaller than 1800, preferably of about 1500 to 1750, is formed between thread inlet and thread outlet.

Brief description of the invention Further details of the invention will now be illustrated with reference to embodiments.

Figure 1 shows the main elements of an embodiment of the new invention.

Figures 1A, lE, 1C, 1D are various cross sections of the filament during and after processing.

Figure 2 is a simplified section through a device.

Figure 3 is a partial section and partial elevation of Figure 2 along section III-III.

Figure 4 is side elevation IV of Figure 3 with a linearly moving traversing device.

Figures 5, 5A show the microadjusting means on an enlarged scale.

Figure 6 shows an embodiment in which two threads can be processed simultaneously according to the invention.

Figure 7 is a section along section line VII-VII in Figure 6.

Figure 8 shows a further embodiment of a device with a double yarn path.

Figure 9 is view IX from Figure 8.

Figure 10 is section X - X from Figure 8.

Figure 11 is view XI from Figure 8.

Methods and implementation of the invention Reference is made hereinafter to Figures 1 and 1A, 1B, 1C and lD.

The starting material here is a textured yarn la with the known loops 2, as illustrated on an enlarged scale in Figure 1A. It is assumed that the textured yarn is known. The loops 2 form a downy sheath and enclose the core which is formed from a plurality of so-called standing members 3 illustrated by small circles. The standing filaments together form the thread core 4. However, the transition from the thread core 4 to the loops 2 of the sheath is not sharp but fluid. Since the yarn is shortened during texturing, only some of the standing members lie with their axes in parallel. Figures 1A to 1D are only an illustration and not microsections. The yarn la is guided continuously via an inlet thread guide 5 consisting of two sliding members 6 and 7 at a velocity VF. Figure 1A shows a yarn cross section at A.A thread diameter FD1 which corresponds to the maximum thickness, measured over the extreme points of the loops, can be considered as a theoretical observation. The textured filament la is then guided via a processing support 8 which has a convex shape toward a processing tool 9. The convex shape is formed in Figure 1 by a relatively large radius R. The processing tool 9 has a grinding covering 10 in Figure 1.

Concurrent running Vsgl and processing opposing running Vge are shown with the processing tool. Both directions of travel are possible. Concurrent running is generally preferred but necessitates a higher speed of rotation of the tool. In earlier experiments, a speed of rotation of the grinding tool of 1600 to 1800 m/min was adjusted during concurrent running, for example at a thread velocity of 400 m/min. An opposing speed of rotation of 300 to 1800 m/min can be selected at a thread velocity of 300 m/min. The convex shape of the processing support 8 accordingly has the advantage that the parts projecting from the core, in particular the loops 2, project even further to the processing tool 9 relative to their original position. The support side of the yarn is flattened on the processing support. A somewhat smaller core thickness FD2 is formed.The flattened region is produced by the slightly convex shape and a minimal pull "Z" on the yarn and has proven to be very advantageous. The core diameter FK is increased only to a small extent during texturing in contrast to the diameter FD over the loops. This is advantageous insofar as the adjustment of the processing gap SD can be controlled relatively easily without the core being damaged by the processing tool. Figure 1C accordingly shows the section C during engagement of the processing tool with the smallest possible dimension SD. It has not yet been possible to test all yarn qualities. Earlier experiments have shown that the yarn la was to be guided in such a way that it did not enter the processing zone Wz as the risk of damage to the core 4 would otherwise arise or even the severing of the yarn.The yarn must not loop the tool or be guided round the tool or issue via the tangent T to the right in Figure 1. Contrary to early fears, the geometric shape of the processing support 8 in the immediate vicinity of the processing point Bs has not proven to be so critical. In Figure 1, this is almost a straight line. In contrast, the solution in Figure 3 has a very small radius R of the processing support 8 or much smaller curvature. After processing, the yarn lb is guided again, more specifically by outlet thread guide 11. The two thread guides 5 and 11 have proven to be very important for the reliability of operation.

The outlet thread guide 11 is also illustrated schematically by two slide members 12 and 13. Once the yarn has left the slide member 13, the take-off direction can be selected freely. A constant tensile stress "Z" is maintained throughout the entire process. Figure 1D accordingly shows a cross section through the processed yarn ib with filament ends 14 projecting on one side.

As the course of the majority of the individual projecting loops has a slightly helical component, the projecting ends 14 do not have a regular direction of projection but resemble the projecting ends of the fibres of spun yarn. If yarns other than the textured yarns illustrated are processed, the projecting parts are reduced according to the cutting depth.

Figures 2, 3 and 4 show an entire device, the processing tool being designed as a simple grinding wheel 9 and being surrounded by a closed housing 20. In Figures 2 and 3, the numerical adjusting means 21 are allocated to the processing support 8' so the processing support is moved to and fro for adjustment on the grinding wheel, as indicated by + and -. The distance SD between the processing support 8, 8' and the processing tool can now be adjusted in two ways: - Firstly the open threading position. For the open threading position, a holder 22 is pushed away by a few millimetres, for example by 5 to 10 mm, via a cam 23 and a handle 24 against the clamping force of a spring 25 by the processing tool. The unprocessed yarn la can easily be threaded after a cover 42 has been pivoted in the open position. The cam is rotated via a dead position for the completely open position. If the handle is now turned back, the compression spring 25 ensures that the processing support 8 automatically moves into the preadjusted working position.

- Secondly the working position SD. For adjusting the processing position, the holder is adjusted in microstages via an adjusting wheel 26 and threaded stud 27 as well as threaded nut 28. The adjusting wheel 26 is coupled via a shaft 29 to a counter 30 which is equipped, for example, with a stepping system corresponding to an adjustment of 0.005 mm. The processing interval can therefore be adjusted or set numerically in partial stages of 5 pm. m. The respectively found optimum value is determined and stored for the processing or reevaluation of subsequent identical yarn qualities. From the manufacturer and after every change of the grinding or cutting tool the counter 30 has to be set to zero.In the region after the processing point there is arranged in the housing 20 an aspiration orifice 40 from which the processing waste is aspirated via an aspiration conduit 41. The aspiration conduit 41 is arranged on the cover 42 which is detachably connected to the housing 20. For optimum use, for example of the entire grinding covering or according to the width of the grinding covering, the thread is displaced laterally or transversely to the processing surface of a traversing system 43 with a corresponding linear to and fro movement 44 (Figure 4).

The processing tool is driven at high speed by a motor M (not shown). The speed of the driving motor can be 5000 to 20,000 rpm.

Figures 5 and 5a show the adjusting means 21 on an enlarged scale. The design illustrated is suitable, on the one hand, for numerically adjusting an internal adjusting block tensioned by the springs 25 to an accuracy of micromillimetres via the adjusting wheel 26. On the other hand, by tensioning the spring 25, the processing support 8 can be pulled back for threading and a threading gap can be produced. Should the thread wind on the processing tool during operation, the spring 25 can yield and protect the mechanical elements before a sensor stops thread travel.

Figures 6 and 7 show a further design with a double thread guide or two parallel thread paths. In this case, the housing is designed as a housing block 50 in which the processing tool, the thread guide, processing support, adjusting means and a traversing device 51 are arranged. The traversing device 51 is formed as a free-wheeling traversing wheel which is driven by the thread itself and on whose periphery two traversing grooves 52, 52' are arranged. The cover 42 has an aspiration duct 53 which is connected to an aspiration pipe 54 and carries off the processing waste. The two traversing grooves 52, 52' allow two threads or two textured yarns la', la" to be processed simultaneously. These are preferably two identical yarn qualities.However, it is also conceivable for the same yarn which is processed once, for example, via the traversing groove 52 to be guided in a second passage via the traversing groove 52', that is processed twice. The traversing wheel moves in an anticlockwise direction. It is important here for the entire yarn guide to be duplicated 5, 5' and 11, 11', etc.

Reference will be made hereinafter to Figures 8 to 11. They show a particularly advantageous design of a grinding device with a double yarn path but without a traversing device. Experiments with a corresponding device have yielded very positive results, particularly with respect to the cleaning of the entire operating chamber in the housing 20. The interior of the housing is circular over the majority of the periphery 26 with a centre (Zk) offset eccentrically from the centre of rotation Dz of the grinding wheel. The aspiration orifice 40 is at the narrow point 61 between the circumferential face 60 and the external surface 62 of the processing tool 9.This means that, owing to its high speed, the processing tool not only has a fan wheel effect but also allows very effective cleaning of the entire internal operating chamber, together with the air aspiration means arranged tangentially at the narrow point, The effect of the air aspiration is almost the same if the yarn travels with the rotation direction of the processing tool or just in the inversed direction. It is possible to 'turn 1800 t whole apparatus.The yarn guide means can be seen from the exterior in Figures 9 and 11. The two yarn paths la - lb or la" - 1b" are completely separate, suitably separated yarn inlet points 63 and 64 being arranged on the side of the yarn supply means and separate yarn outlets 65 and 66 also being arranged on the side of the yarn outlet (Figure 11).

Figure 10 is a section X - X through Figure 8 and shows the device in the open position ready for threading. The lid 42 is hinged open and the processing support 8 has been brought into the disengaged position over the handle 24. The entire threading path is exposed so the two parallel paths of the yarn la' - lb', la" - lb" can be inserted freely via the corresponding threading slits 67 both with the travelling yarn and with the stationary yarn. The driving motor M is connected via an electric cable 68, control optionally being carried out at variable speed via known open/closed loop control means.

Claims

1. Method of producing a spun yarn effect in filament yarn, in particular in air jet-textured yarn with a core and external loop structure, characterized in that the yarn is guided over a processing support and the loop structure of the yarn is reduced to a pre-adjustable depth with a grinding or cutting tool on the side remote from the processing support.

2. Method according to Claim 1, characterized in that the pull in the yarn is kept constant in the region of the processing support and processing is carried out "off-line" with respect to texturing, two or more threads guided in parallel being processed simultaneously.

3. Method according to Claim 1, characterized in that a yarn, in particular two yarns, are processed continuously "in-line" after texturing at the processing speed of texturing, and the pull in the yarn is kept constant and, in particular, reproducibly controlled after processing.

4. Method according to one of Claims 1 to 3, characterized in that the processing support is disengaged for threading and a lid of the processing chamber is opened and the yarn is inserted via corresponding threading slits.

5. Method according to one of Claims 1 to 4, characterized in that the depth is preferably adjusted numerically in microstages, a partial stage particularly preferably being 10 g or smaller.

6. Method according to one of Claims 1 to 5, characterized in that the velocity of the grinding or cutting tool is at least 20% higher than the velocity of the continuously passing yarn and preferably corresponds to the velocity of known plastics or wood processing tools, the grinding or cutting tool being moved in the same direction as or in the opposite direction to the yarn.

7. Method according to one of Claims 1 to 6, characterized in that the processing waste is aspirated from the zone immediately after the processing point tangentially to the external surfaces of the cutting or grinding tool.

8. Device for processing yarn, for producing a spun yarn effect in filament yarn, in particular in air jet-textured yarn with a core and external loop structure, characterized in that it has a processing point formed by a processing support and a driven grinding or cutting tool as well as microadjusting means for adjusting the processing depth.

9. Device according to Claim 8, characterized in that the processing point with the grinding or cutting tool is surrounded by a closed housing connected to an air aspirator.

10. Device according to Claim 8 or 9, characterized in that a thread guide is arranged at a distance before and after the processing point preferably on the housing in such a way that the yarn path is forcibly guided adjacently to the preferably convexly designed grinding support in the operating state.

11. Device according to one of Claims 8 to 10, characterized in that the tool is designed as a grinding wheel which is driven at high speed, preferably with a diamond covering or as a blade system, the width of the processing tool being a multiple of the yarn diameter.

12. Device according to one of Claims 8 to 11, characterized in that the device has yarn inlet points and outlet points for two or more yarn paths.

13. Device according to one of Claims 8 to 12, characterized in that it comprises microadjustment means for disengagement and an open threading position, the microadjustment means preferably comprising a spring which can be biased.

14. Device according to Claim 13, characterized in that the microadjustment means and the disengagement are allocated to the correspondingly adjustable processing support, the disengagement preferably having two positional regions, a completely open catch point and an intermediate position which automatically moves the processing support into the working position and keeps it in an exact working position via spring tension.

15. Device according to one of Claims 8 to 14, characterized in that the microadjustment means has a numerical position display for the processing depth, the position display value being a relative reference value which can be used for identical reproducibility of the grinding operation, in particular for the same yarn quality.

16. Device according to one of Claims 8 to 15, characterized in that the housing has, in the region after the processing point as viewed in the direction of movement of the processing tool, an aspiration orifice for aspiration of the processing waste, the aspiration orifice leading tangentially to the external surface of the cutting or grinding tool.

17. Device according to one of Claims 8 to 16, characterized in that the housing is designed as a housing block having the yarn guide, the grinding support with the adjustment means and the grinding or cutting tool, and is designed as a constructional unit with a driving motor flanged directly thereon.

18. Device according to one of Claims 8 to 17, characterized in that the processing support has a rounded supporting surface, the thread guides being arranged in such a way with respect to the supporting surface that an angle smaller than 1800, preferably of about 1500 to 175is formed between thread inlet and thread outlet.

19. A method of producing a spun yarn effect in filament yarn, for example in air-jet textured yarn, which comprises reducing the loop structure of the yarn by grinding or cutting as the yarn is drawn over a support.

20. A device for producing a spun yarn effect in filament yarn, for example in air-jet textured yarn, which comprises means for reducing the loop structure of the yarn by grinding or cutting as the yarn is drawn over a support.

21. A filament yarn having a spun yarn effect produced using a method in accordance with any one of Claims 1 to 7 and 19 and/or a device in accordance with any one of Claims 8 to 18 and 20.

22. A method of producing a spun yarn effect in filament yarn substantially as hereinbefore described with reference to the accompanying drawings.

23. A device for producing a spun yarn effect in filament yarn substantially as herein before described with reference to and as illustrated in the accompanying drawings.

24. A spun yarn effect filament yarn substantially as hereinbefore described with reference to, and as illustrated in, the accompanying drawings.

Amendments to the claims have been filed as follows Claims 1. Method of producing a spun yarn effect in filament yarn, in particular in air jet-textured yarn with a core and external loop structure, wherein the yarn is guided over a processing support and the loop structure of the yarn is reduced to a preadjustable depth with a glining or cutting wheel driven at high velocity on the side remote fran the processing support, the grinding or cutting tool being moved in the sse direction as or in the opposite direction to the yarn.

5. Method according to one of Claims 1 to 4, characterized in that the depth is preferably adjusted numerically in microstages, a partial stage particularly preferably being 10 ss or smaller.

8. Device for processing yarn, for producing a spun yarn effect in filament yarn, in particular in air jet-textured yarn with a core and external loop structure, wherein the device has a processing point formed by a processing support and a high velocity driven grinding or cutting wheel and micro adjusting means for adjusting the processing depth, the grinding or cutting tool being moved in the sme direction as or in the opposite direction to the yarn.

19. Device according to one of claims 8 to 17 wherein the processing support is convexly shaped.

20. A method of producing a spun yarn effect in filament yarn, for example in air-jet textured yarn, which comprises reducing the loop structure of the yarn by grinding or cutting as the yarn is drawn over a support.

21. A device for producing a spun yarn effect in filament yarn, for example in air-jet textured yarn, which comprises means for reducing the loop structure of the yarn by grinding or cutting as the yarn is drawn over a support.

22. A filament yarn having a spun yarn effect produced using a method in accordance with any one of Claims 1 to 7 and 20 and/or a device in accordance with any one of Claims 8 to 19 and 21.

23. A method of producing a spun yarn effect in filament yarn substantially as hereinbefore described with reference to the accompanying drawings.

24. A device for producing a spun yarn effect in filament yarn substantially as herein before described with reference to and as illustrated in the accompanying drawings.

25. A spun yarn effect filament yarn substantially as hereinbefore described with reference to, and as illustrated in, the accompanying drawings.

26. A device for producing a spun yarn effect in filament yarn, in particular in air jet-textured yarn, comprising means for reducing the loop structure of the yarn by grinding or cutting with a high velocity driven grinding or cutting wheel as the yarn is drawn over a convexly designed support, in the same direction as, or in the opposite direction to, the movement of the grinding or cutting tool.