EP0539866B1 - Process for drawing off a continuous synthetic yarn - Google Patents

Description

The invention relates to a method for pulling a endless, synthetic thread according to the generic term of Claim 1 or according to the preamble of claim 14. These methods are known. The first is e.g. B. in the Magazine "chemical fibers / textile industry" September 1991, S. 1002, 1004, described (see also DE-A 22 04 397).

The known process (see also EP-A-0 016 942) is a one-step spinning process for the production of a multifilament thread in which the thread through a delivery plant at high speed from the Spinneret withdrawn and then by means of a winding device is wound up. The delivery plant exists from two godets, each of which the thread wraps at 180 °. This means that the thread tension is above the Godets, starting with the lower trigger voltage and to the godets due to air friction and other frictional influences is continuously increased up to the bobbin thread tension, with which the thread on the godets accumulates. The thread tension is increased so that a total or partial stretching of the freshly spun Fadens occurs. It is now undesirable and inappropriate, with such a high thread tension the thread also on the spool. After the described The two godets have a glossy surface hard chrome plating. As a result, there is between Thread and the godet surface a high friction resistance for dynamic friction and for static friction. Around to achieve the necessary reduction in thread tension, Spinning machines are said to have two godets or godets with laying roll need to be sufficient Thread tension reduction and good uniformity (Uster value) to achieve the thread. At take-off speeds, that exceed 5000 m / min has this method, in which Production of threads made from very thin filaments exist, the disadvantage that filaments break and that broken filaments are no longer supported by the godet but from the airflow surrounding the godet be carried away and then one on the godet Form winder. Such a winder leads to business interruption. Threading is also very difficult, because here the thread due to the large difference in speed tears. The setting is also very difficult the speeds of the delivery plant on the one hand and the winding device and traversing device on the other hand. For one, these speeds have to be independent be adjustable from each other, but they must Tearing or swapping (thread tension too low) to prevent it from being adjusted very precisely and there is also a risk of thread damage here or business interruption due to tearing or winder formation. In particular, the peripheral speed the take-up spool may be slightly lower than that Circumferential speed of the delivery plant. On the other hand, it may but not be significantly lower than that geometric sum of the circumferential speed of the coil and traversing speed with which the thread runs lengthways the spool is moved back and forth. Finally, at this process, the desired thread tensions difficult and not stable.

These disadvantages are the so-called godetless spinning avoided. The thread is directly through the Take-up spool removed from the spinneret. This creates however, the disadvantage that the thread between the spinneret and winding receives the thread tension that is required is to fully or partially stretch the thread. The thread tension with which the thread is wound is even higher than that for drawing required thread tension. So that's godless Spinning only possible with such winding devices that have an integrated voltage reduction pallet. To do this on the winding device according to DE-C 23 45 898 ( = US-A 3,861,607)). With these winding machines the thread, before it hits the bobbin, with a wrap angle of 60 to 120 ° around a Grooved roller, which is part of the traversing device is. This grooved roller can run at a peripheral speed are driven which are greater than the peripheral speed the coil is. This will reduce thread tension and enables godless spinning. Therefore have such winding machines are for the godetless Spiders prevailed.

In the winding device according to DE-PS 30 16 662 the same Effect can be achieved in that the thread first via a traversing device, then via a smooth roller that with higher peripheral speed than the take-up spool can rotate, and then over a guided second traversing device and fed to the coil becomes. Because a smooth roller is used and wrapping at 180 ° is the danger at Winder formation also exist here and there are also here the difficulty in putting on the thread. Even with the Setting the roller relative to the speed setting of coil and traversing device it holds very precisely.

Finally, a winding machine is known from EP 00 16 942 A1, in which a rotationally driven grooved roller, which partially wraps around the thread, is arranged between the traversing device and the winding spindle in order to reduce thread tensions, in particular the thread tension fluctuations induced by the thread traversing device during winding of the thread - And speed adjustable. In order to reduce the thread tension of the thread running onto the grooving roller, the wrap angle of the thread on the grooving roller can be adjusted by the change in position in such a way that the thread slides on the thread guide surfaces of the grooving roller at a predeterminable speed difference between the thread speed and the peripheral speed of the grooving roller.
The known arrangement allows thread tensions and thread tension fluctuations to be reduced shortly before the thread is fixed on the spool, so that the spool structure and the quality of the spools are improved.

The known methods are based on the common endeavor to to fully or partially stretched in one operation Threads (FOY or POY), but one to prevent excessive thread tension build-up on the bobbin. A godet would be suitable for this, but on the other hand it has the difficulties described result.

It is therefore an object of the invention to provide a possibility for reducing the thread tension before the thread runs into the winding device, while avoiding the disadvantages of the known godets.
The solution to the problem results from the characterizing part of claim 1.

The delivery unit can consist of a driven roller, in particular but consist of two driven rollers that are arranged one behind the other so that the thread with them a wrap angle of at least 45 ° each wraps around. So the total wrap angle is anyway greater than 90 °. However, it is well below 360 °, preferably below 270 °. Because the delivery plant is driven at a peripheral speed, which is higher than the thread speed that the on the Has accumulating thread exists between the Surface of the delivery mechanism and the thread a speed difference (Slip) and thus sliding friction. It now shows that in the event of a speed difference the coefficient of friction of the sliding friction changes Dependent on the amount of slip, sometimes erratic and not reproducibly changes. Therefore, godets and suppliers so far with regard to their friction behavior equipped with surfaces and from the thread with so much Wrapped around windings that sliding friction is avoided. But if the speed difference (slip) is at least 3%, but preferably more than 5% and the wrap angle accordingly in the specified Range is set, so contrary to expectations achieve that the friction behavior of the thread compared to the Surface of the delivery plant practically the friction behavior of a body with dry sliding friction.

The friction behavior of a body with dry sliding friction is characterized in that the sliding friction coefficient is smaller than the static friction coefficient and furthermore the sliding friction coefficient is independent of the speed. This means that the resistance force that acts on a moving body is independent of the speed and therefore reproducible. For the invention, this means that a constant frictional force always acts on the thread regardless of fluctuations in the slip, which leads to a precisely defined reduction in thread tension. Therefore, the thread tension reduction is independent of the thread speed and thus the relative speed of the thread on the surface of the delivery mechanism. The importance of the invention is to have recognized that this independence is necessary for a slip delivery plant, by means of which the thread tension is to be reduced, and also that there is a slip area in such a delivery plant in which this independence exists. The result of this is that, on the one hand, there is a significant reduction in thread tension, but on the other hand, the speed setting of the delivery unit is completely uncritical as long as it is only higher than the specified limit. In contrast to the known methods and the known uses of delivery systems and godets, the surface is designed so that it has a low coefficient of friction compared to the thread. The surface is therefore by no means smooth or shiny, but rather rough or matt. Wear-resistant surfaces of this type can, for. B. by plasma coating with metal oxides. It is particularly preferred to also carry out the thread treatment with liquids before entering the delivery plant in such a way that the coefficient of friction is low. A coefficient of friction of 0.2 for slip friction is desirable. In this embodiment, the Eytelwein coefficient (M = E ^µ alpha, where µ is the coefficient of friction and alpha is the wrap angle) is not greater than 4, preferably less than 3.

Another important feature is that the supplier works before the traversing triangle, the relaxation of the thread happens above the head thread guide, which is the tip of the traversing triangle. As is well known, the Traversing in which the thread is transverse to its direction is moved back and forth at high speed and a traversing triangle describes, strongly fluctuating Thread tension with, thread tension peaks in the end areas the traversing. With the proposed method it is avoided that these thread tension peaks add up with the high thread tension, which after the Pulling the thread off the spinneret when stretching occurs. Therefore, these thread tension peaks can also do not adversely affect the quality of the thread.

The range of the total wrap angle becomes after two Criteria preferred. One criterion is the sufficient one and significant reduction in thread tension, the other criterion is a smooth, trouble-free thread run. The height of the wrap angle also has a - but not very big - influence on the Height of the minimum value of the slip, which is specified must have the same sliding friction behavior as with to achieve dry friction. Such limits are in Claim 2 specified.

The speed difference between the run-up speed of the thread on the delivery mechanism and the surface speed the supplying plant must be that there is sliding friction in every case. It is too take into account that the thread when running onto the The delivery plant is not a fixed structure, but rather through itself Stretching or shortening the surface speed of the Can adjust delivery plant. This adjustment must be avoided become. The minimum value of the slip is from surface to the surface of the delivery plant on the one hand and from thread to Thread on the other hand may be different. It has however, it emerged that - in the previously examined Use cases according to claim 3 - the speed difference, i.e. the slip to at least 3%, but preferably set to more than 5% should. It has been shown that in the range of more than 3% in any case a very stable thread run can be achieved and that with a slip of 5% and up to 20% too no influence of the thread tension by the surface speed of the delivery plant occurs more. The means that in this operating area with a slip of more than 3% to 5% with very stable operating conditions an optimal and constant reduction of the Thread tension are possible. As a result, that too the thread speed and thus the thread quality are constant and no longer depend on the height of the slip to be influenced. So it has been shown that in this Operating range of the slip a total wrap angle of 90 ° to a stress reduction between Overrun tension and outlet tension of 30%, one loop of 135 ° to a thread tension reduction of about 40% and a loop of 225 ° for a thread tension reduction leads from 70%. That means the thread tension release only from the wrap angle depends and therefore by adjusting the wrap angle can be set easily and reproducibly can.

You can now add another before or after the supplying plant Make thread treatment, what according to claim 4 before all for setting a suitable sliding friction coefficient serves.

The method of claim 1 is particularly useful to the filaments of a thread at high speed of the spinneret and pull it off completely or partially stretch. The delivery plant according to the invention has the Advantage that no winders are formed on it and that on the one hand high thread tensile forces for stretching on the Thread can be exercised, but on the other hand a more targeted Thread tension reduction possible in the winding zone is.

Especially in the manufacture of technical threads that not only by their thickness, but also by special high strength, but it may be necessary be the filaments of the thread through a non-slip usual, i.e. multiple looped galette with high Subtract friction coefficient from the spinneret and, if necessary, in one step or in two steps between two godets stretch. In such a case, the thread of the Rewind zone through such a slipless, multiple looped godet with high coefficient of friction are delivered with the disadvantage described above, that on this godet due to the low winding tension easily winders arise. This is why the use of the delivery plant according to the invention also between such a godet and the head thread guide of Rewinding zone for thread tension reduction is useful, because with this delivery unit is achieved that the thread with sufficient Thread tension subtracted from the godet, the However, winding is fed with a low thread tension becomes.

According to claim 7 it is proposed that between the Supplying plant and the head thread guide, which is the tip of the Traversing triangle forms a heat treatment z. B. by a steam-fed nozzle is provided. With such a Processes can include polyamide threads high speed of more than 3500 m / min Fast spinning are produced, but also polyester threads, which in this case at speeds of more than 5000 m / min can be wound up. For the production fully oriented threads is recommended before Supply plant to provide a heating tube, such as. B. in the US PS (see also US PS 3,229,330).

By interposing the steam treatment results especially with nylon, but also with polyester, that spun at speeds over 5000 m / min is the advantage that the resulting from the stretching Shrinking tendency is triggered and such a strong Shrinkage occurs that according to its strength and Shrinkage properties of good thread arise.

After all, it is possible and recommended between the supplying plant and the head thread guide of the traversing triangle, possibly after the steam treatment facility, a to provide so-called Tangled nozzle. In this is an air jet blown across the thread direction and thereby the formation of individual ones distributed over the yarn length Knots causes. This creates cohesion the individual filaments in the thread improved.

The method according to this invention is particularly suitable also for the so-called "short spinning". It will Delivery plant at a short distance of less than 2 m arranged below the spinneret. The thread is through the delivery plant is withdrawn so quickly that sufficient Cooling takes place over this short distance. At the same time the high air resistance that acts on the thread causes together with the residual heat remaining in the thread an almost complete stretching of the thread. The speeds are over 7000 m / min.

The surprising discovery underlying this invention is that when the slip increases Values not previously practiced that are above 2%, preferably but more than 3%, the thread tension change after the godet or after the delivery plant no longer from is dependent on the surface speed of the godet. Therefore, this method is very stable in operation possible because of the inclination of the delivery plant due to filament breaks and / or winder formation for a business interruption is practically eliminated. The high of Thread tension, on the other hand, is changed with the wrap angle alpha clearly and stably defined. As a result of the height of slip is also the risk of winder formation at the delivery plant despite the low thread tension, with which the thread runs from the delivery plant, eliminated. So it can be a very strong stress relief occur. The first godet works in the field of static friction with the advantage of great thread tension reduction. The second godet causes a further reduction in thread tension and an equalization and stabilization the operating conditions. Because of the strong stress relief the method is particularly suitable for Insertion of the post-treatment procedures described the stretching process. It is therefore between the delivery plant and shrinking the head thread guide proposed where the thread is exposed to heat and / or a tangle treatment in which an air jet directed at the thread transverse to the thread axis and thereby a bond between the individual filaments will be produced.

The method according to the invention stands out, as already said, in that reproducible process parameters, especially thread tensions and thread speed, let set. Now, however, are on the one hand Cases conceivable where there is maximum accuracy arrives, but on the other hand cases are also conceivable in which it in long-term operation due to changes in the surface quality or changes in the quality of the thread to changes in the process parameters and thus there is also a change in the thread properties. Around to eliminate this, it is further proposed that Regulate the thread tension by changing the wrap angle in Dependent on the measured thread tension becomes. It can be simultaneously through the measuring device also the wrap angle can be set by one of the rolls of the delivery plant or another roll, which is upstream of the delivery plant, such under the Thread tension is arranged to be movable against spring force, that the wrap angle changes with their movement. This is another possible execution. It can however, a sensor can also be provided with a Adjuster by which the relative position of the Roles of the delivery plant is changed so that the Wrap angle changes.

With the delivery plant according to the invention new types can be created Process variants of the short spinning and of heating tube spinning. These process variants are the subject of claims 11 and 12.

During the process of short spinning as well as the process hot tube spinning has so far suffered from the disadvantage that the resulting hidden threads are very prone to shrinkage are significant and therefore already during winding Difficulties can be with the invention Process variant also the reduction of Carry out shrinking. This is the subject of the claim 13.

Another advantageous method variant results for the so-called spin texturing according to the generic term of claim 14. Spin texturing is known by DE-PS 26 32 082.

The freshly spun and stretched thread through a hot air or steam nozzle into a pitot tube promoted and compressed there to a thread plug.

The thread plug is under the impact of the thread and the hot air (steam) is conveyed through the pitot tube and pulled out of the pitot tube and wound onto a cooling roller. Before the thread plug runs off the cooling roller the thread plug is released. This leads to considerable Thread tension fluctuations. It was therefore with Difficulties connected, the now curled thread subject to an even tangle treatment, because the thread tension fluctuations too different Tangle results led. Also interposing one usual delivery godet between cooling drum and tangle nozzle brought no remedy, since the supply godet the thread tension fluctuations transmits.

With the method variant according to claim 14, these are Fixed difficulties.

It should be particularly pointed out that claim 14 also advantageous due to the features of the claims already described 2 and 3 can be trained, because those in these Range specified for the total wrap angle a and those available at the supplying plant Slip can also be advantageous on the from Use thread stopper with the textured thread removed. By using another slip-free delivery plant or in particular a thread brake between the The delivery plant and the Tangled nozzle can be used to further homogenize the thread tension.

Fig. 1

eine Spinnanlage in der Ansicht von vorne;

Fig. 2

die Spinnanlage in der Ansicht von der Seite;

Fig. 3 bis 9b

Modifikationen der Spinnanlage nach den Figuren 1 und 2;

Fig. 10

ein Diagramm der Fadenspannung über dem Schlupf;

Fig. 11, 12

weitere Modifikationen zur Regelung der Fadenspannung;

Fig. 13

eine weitere Modifikation zur Einstellung der Fadenspannung von Hand.

The invention is described below using exemplary embodiments. Show it:

Fig. 1

a spinning system in the view from the front;

Fig. 2

the spinning plant viewed from the side;

3 to 9b

Modifications of the spinning system according to Figures 1 and 2;

Fig. 10

a diagram of the thread tension over the slip;

11, 12

further modifications to regulate the thread tension;

Fig. 13

another modification to adjust the thread tension by hand.

The embodiment shown in the drawing 1 and 2 shows a spinning system for four threads 1, the one on a common winding spindle 2 Be wound up. Before winding up Traversing device 3 through which each of the threads along the associated coil is guided back and forth. Describes each of the threads between the fixed head thread guide 4 and the traversing device 3 a traversing triangle.

Between the collecting thread guides 5 and the head thread guides 4 is the delivery plant 7. The collecting thread guides 5 have the Function, the mutual distance of the threads, the first corresponds to the pitch of the spinnerets 8, on the Reduce the pitch of the coils on the spindle 2. The Delivery plant 7 extends over the total distance of Collective thread guide 5. The feed unit 7 consists of two Rollers 9 and 10, which are parallel to each other and with a Height offset are arranged, which is exactly the same here Diameter is. This results from FIG. 2.

Fig. 1 shows a larger height offset from the graphic Reasons to be able to illustrate that it is are two roles 9, 10. The roles are opposite essentially at the same peripheral speed driven. You will be off the thread with a wrap angle Alpha wrapped around at least 90 ° and possess a low coefficient of friction compared to thread 1, e.g. B. 0.2 to 0.6. The peripheral speed is higher, e.g. B. 3% to 30% higher than the thread speed. The thread speed is geometric Sum of the constant peripheral speed of the Coils and the traversing speed of the traversing device 3rd

The two godets of the delivery plant can be relative to each other be shiftable to the thread without touching the To be able to place godets on the winding head. You can do this the godets 9, 10 z. B. on a rotatable bearing plate 17 (Fig. 9a, 9b) can be rotatably mounted. The godets can by a motor with gearbox connection, but also be driven by two independently controllable motors. The speed of the first godet 9 can thus be lower than that of the godet 10 can be set so that at the godet 9 static friction, on the godet 10, however significant sliding friction with a slip of 3% or more consists.

FIG. 10 shows a diagram in which the dependence of the thread tension force (F) between the supply unit 7 and the winding, measured in cN, on the slip is shown. The slip is the difference between the surface speed (v _LW ) immediately in front of the feed unit 7 minus the thread speed (v _F ) of the feed unit, divided by the thread speed (v _F ) mentioned in percent. S = (v LW - v F ) v F x 100 [%].

That applies when the slip is below a certain Value. In this area is the context between the thread tension and slip practical and not reproducible, especially if the slip is less than one percent. About that the result is an essentially reproducible one Context. However, it turns out that the thread tension depends on the amount of slip. Only in this The area also shows that the lowering of the thread tension or thread tension from the wrap angle alpha or its sum with which the thread drives the Rolls of the delivery unit 7, depends. It but it shows in particular that essentially independent of this wrapping at a certain slip, which is in the range of 2.5%, with increasing Slip no longer reduces the thread tension is. For this reason, the operating point according to the invention of the supplying plant in the area in which the thread tension measured behind the delivery plant is not is more dependent on the amount of slip. It exists now a sliding friction behavior between the thread and the surface of the delivery plant, which essentially corresponds to the sliding friction behavior with dry friction. In this way, bobbins and threads of produce great uniformity and goodness. On the other hand, there is no risk of filament breaks and that the filaments, broken filaments or the thread Form winder on the rollers of the delivery plant.

Modifications are shown in FIGS. 3 to 9. These modifications relate to areas I, II, III, which is dash-dotted accordingly in the drawing of FIG. 2 are outlined. 3 shows a modification of the delivery plant 7. Here, the delivery plant consists of a driven roller 10, on which the thread through a freely rotatable overflow roller 11 is fed. To the To achieve advantages of the invention, the wrap angle alpha here only on the driven Roller 10 can be adjusted. The slip occurs exclusively on the driven roller 10.

Fig. 4 shows a modification of the delivery plant. Here, the delivery mechanism consists of two driven rollers 9 and 10. However, the first roller 9 is driven precisely at a peripheral speed which is equal to the thread speed (v _F ). Therefore, the wrap angle alpha, which is required for the desired reduction in thread tension or thread tension, must be set on the roller 10. It is the roller 10 whose peripheral speed is higher than the thread speed or the surface speed of the preceding roller 9 by the desired slip.

5 and 6 show modifications of area II in front of the delivery unit 7 according to the invention A heating device is provided in front of the delivery plant. Here can be a steam chamber 12 - as shown - act. In this steam chamber there is a steam nozzle 13, through which the thread is passed and in which the Heated steam or saturated steam is applied to the thread becomes. In place of this heater, one can Step overflow rail or a straight heating pipe, through which the thread is passed without contact and in which occurs the stretching and fixing of the thread. Such a heating tube is e.g. B. in DE 38 08 854 A1.

6 is a modification of this area II with a heated godet 14 and an associated overflow roller 15 shown. The godet is off the thread several times entwined. It has a speed equal to that of the pull-off speed of the thread from the spinneret. The godet can fix the removed Thread. The temperature - depending on Thread type - between 90 ° and 240 ° C.

The thread is then from the downstream delivery plant deducted according to Fig. 2, 3 or 4. In this case the Surface speed of the slip rollers 10 accordingly the desired slip (S) over the surface speed the heated godet 14. This will on the one hand ensures that the thread is safe from the heated godet is pulled off and forms no winder. On the other hand, however, the thread tension or - traction - as described above - reduced.

7 and 8 indicate modifications of the area III between the delivery unit 7 according to the invention and the Head thread guide 4.

7 in this area a Tangled nozzle 16 is arranged. With the Tangled nozzle the Thread passed through a cylindrical channel into the An air line opens at the side. By the on the Thread-directed air jet are the filaments of the Thread continuously or knot-like at certain intervals intertwined. This creates cohesion under the filaments, which facilitates winding.

8 takes the place of Tangle nozzle is a steam nozzle with steam chamber 12 and nozzle 13. In the thread channel of the nozzle 13 there is a stream of superheated steam or saturated steam on the thread. As a result of the voltage reduction, which was brought about by the delivery plant 10 is through such a nozzle and steam treatment chamber shrinkage can be made very effectively. For this purpose, a high wrap is used for the delivery unit 7 selected so that the thread tension in the area III is low and the thread can shrink accordingly. Hot air treatment can also be used instead of steam treatment to step. This also depends on its expediency depends on the thread type and thread material.

9a and 9b show a modification of the delivery plant 7 in area I.

In this case too, the delivery plant consists of the two Slip rollers 9 and 10. These slip rollers are on one rotatable plate 17 mounted. The plate 17 is in one Position can be determined. Touch in this position rollers 9 and 10 do not thread. So it is very easy, the thread with a suction gun 19 to the rollers 9, 10 to create. It should be mentioned that without funding through the delivery unit that comes from the spinneret Thread has an undefined speed. The string can also be slowly removed from the spinneret. Therefore, conventional suction guns 19 are sufficient for only a small number Suction power to pull the thread from the spinneret 8 and put it on the winding head. Only afterwards the plate 17 is in the position shown in Fig. 9b in Direction of arrow 18 rotated. As a result, the rollers 9 and 10 in contact with the thread. The rotation of the turntable 17 can be chosen so that the desired total wrap angle alpha on the two rollers 9 and 10 sets.

Fig. 11 shows a modification which is similar to that 1, 2. In this respect, the description also made the subject of this description. At this modification, the roller 9 is at the end of a rocker 20 rotatably supported and driven. The swing arm 20 is pivotable about a pivot axis, which is coaxial to Axis of the roller 10 lies. The swing arm 20 is through a Cylinder-piston unit 21, which with a constant pneumatic pressure is loaded against their weight like this supports that the weight is fully compensated. On the other hand, the rocker 20 is replaced by a Stationarily supported spring 22 against the force of the cylinder-piston unit 21 charged. Therefore the thread tension acts on the pivot lever 20 against the spring force 22. Consequently, the pivot lever 20 depending on the Thread tension swiveled. This changes at the same time the wrap angle alpha on the rollers 9 and 10. With a smaller wrap angle, the thread tension smaller, so that the spring 22 tends to the Swing lever again in the sense of increasing the wrap angle panned. The opposite occurs when the thread tension is reduced. The swivel lever 20 with the roller 9 thus serves on the one hand as a thread tension measuring device, also as a device for adjustment of the wrap angle and finally at the same time also as the delivery plant according to the invention or part thereof. With this facility, large masses are indeed too move, which gives the system a certain inertia.

However, the facility is only intended to be long-term Fluctuations in the thread tension are corrected.

In the modification according to FIG. 12, which shows section I 2 shows, the delivery plant consists of only one Roller 10, which is wound around the thread. According to the Modification according to FIG. 3, this roller 10 is free rotatable overflow roller 11, through which the Wrap angle alpha is determined. The overflow roller is mounted on the end of a swivel lever. The swivel lever 20 is about the axis of the roller 10 against a spring force (Spring 22) swiveling. The spring 22 is arranged so that they counteracted by the thread pull on the swivel lever exerted torque acts. In this case it works Overflow roller 11 as a measuring device for the thread tension, but at the same time also as an adjustment device for the Setting the wrap angle alpha, which is associated with the pivoting with increasing thread tension reduced, increased with decreasing thread tension.

The modification according to FIG. 13 also relates to the section I of FIG. 2. The roller 9 is on a sled, which is parallel to the incoming Thread in guides is movable. The sledge 24 can be adjusted in height using a spindle. Thereby the wrap angle changes. The special advantage this version is that by the height adjustment the roller 9 does not change the thread path. This also means that the friction conditions on the thread guide remain 5 and the thread guide 4, the delivery plant in each case upstream or downstream are constant.

It can be seen that in this embodiment the spindle can be turned by hand. However, it is also possible to connect this spindle with an adjustment motor and this adjusting motor depending on one before Acting traction force meter arranged to operate, and in the sense of a downward movement and enlargement of the Wrap angle when the thread tension decreases, and in the sense of an upward movement and downsizing of the Wrap angle when the thread tension increases. In in this case, the tensile force sensor z. B. at the point or sit in the area of the thread guide 5, which the Upstream delivery plant. This allows even small ones Changes in thread tension large changes in Wrap angle alpha are caused.

FIG. 14 shows a particularly suitable combination of methods. Here, the thread coming from the spinneret 8 first summarized and then in area II in heated a heating tube 26. Such a heating tube is e.g. B. shown in DE-A 38 08 854 and described.

The heating tube is replaced by an electrical resistance heated outside to a temperature above 90 ° C. The heating pipe is so tight that the thread has an appropriate temperature assumes and due to its frictional resistance on the Air and its softening stretched in the heating tube becomes. A complete or takes place in the heating tube at least partially stretching the thread.

The thread is removed from area II with the heating tube 26 by the delivery unit 7, the subject of this invention is withdrawn and then led into area III. There the thread is in a steam treatment chamber treated. This will cause the thread to shrink reduced. This is possible because of the delivery plant according to this invention the thread with very little Voltage and thus in connection with the steam nozzle treatment triggered a significant shrinkage becomes. As a result, the tendency to shrink remains on tolerable measure reduced, so that also strongly to shrinkage tending yarns such as B. nylon threads on this Way can be edited and wound up. The Winding is not shown in Figure 14. It was special highlighted that between steam treatment chamber and another delivery plant is planned before winding up can be.

15 shows a process arrangement for spin-stretch texturing with simultaneous knotting treatment (tangling) of thread.

A bundle of filaments emerges from the spinneret 8, which is summarized by a thread guide. The string is then guided over the stretching godets 27 and 28 by which can be heated at least one. Here is the Circumferential speed of the pair of godets 28 so great that the thread between the two pairs of godets 27 and 28 is stretched. The thread is then a hot air nozzle or superheated steam nozzle 29 supplied. In this hot air nozzle the thread is blown into the thread channel conveyed hot air jet and into the subsequent Pitot tube 30 transported. There the thread forms a thread plug 33. As a result of the air pressure at the inlet of the pitot tube 30 becomes the thread plug through the pitot tube 30 conveyed and by the pair of rollers 31 from the pitot tube deducted. The thread stopper is then at least partially wrapped around the cooling roller 32. The Cooling roller 32 is at a slow peripheral speed driven. The cooling roller 32 is porous and it becomes an air stream is drawn in from the outside through the roller. As a result, the thread plug 33 is cooled. Subsequently the thread is separated again by pulling it out the thread plug is pulled out. The exit point is denoted by 34, but it should be emphasized that the exit point due to inevitable irregularities of the thread plug is not constant. Therefore the thread tension of the again running fluctuates Thread. The invention is used to subtract from the resolution point Delivery plant 9. The delivery plant 9 is shown in the Example with a wrap angle of approximated 180 ° entwined. The peripheral speed is more than 3% above the thread speed. This is the Thread tension behind the feed unit 9 is very greatly reduced. The thread tension fluctuations are also corresponding significantly reduced. It can now be a wrapping plant 35 follow. This may result to further equalize the thread tension fluctuation. However, it is expected that in usual Cases where the delivery unit 9 is sufficient according to this invention, to achieve an even tangle result in the subsequent Achieve Tangled Nozzle 16. In the Tangle nozzle 16 an air jet is transversely to the thread axis on the thread blown. This is what happens at regular intervals Knots. The knots are in their shape and Durability and in their intervals the more evenly, the more even the thread tension is. 15 is shown that also between the traversing device 3rd and the tangle nozzle a further wrap 36 lies. This looping delivery plant should avoid that the inevitable thread tension fluctuations that occur in the Traversing zone between the head thread guide 4 and the take-up spool arise, transferred into the tangle zone. Here, too, it is to be expected that this delivery plant will be used for Equalization of the Tangle result advantageous, however, it is also unnecessary in many applications. Of the thread coming from the traversing device is fed over a Measuring roller of the take-up spool 2 supplied.

Claims (16)

1. Method of withdrawing a continuous synthetic filament (1) from a spinning or stretching zone,

   wherein the filament (1) is looped at a looping angle (α) round a delivery mechanism, wherein the looping angle (a) and the peripheral speed of the delivery mechanism are adjusted in such a way that the peripheral speed is higher than the winding-on speed of the filament on the delivery mechanism, and a relaxation of the filament occurs and

   wherein the filament is displaced to and fro by means of the reciprocating device (3) and along the bobbin of a take-up device so as to form a traversing triangle

   and is wound onto the bobbin

   characterized in that

   the delivery mechanism (7) is disposed in the yarn course upstream of the traversing triangle (stationary end filament guide 4),

   that there is such a slippage between the surface of the delivery mechanism (7) and the filament that the slippage behaviour of the filament on the surface of the delivery mechanism is identical to the frictional behaviour in the case of speed-independent sliding friction and a relaxation of the filament occurs above the traversing triangle.
2. Method according to claim 1,
   characterized in that

   the filament (1) is looped round the delivery mechanism (9, 10) at a total looping angle (α) of between 90° and 270°.
3. Method according to claim 2,
   characterized in that

   the slippage is at least 3%, preferably at least 5% of the winding-on speed.
4. Method according to one of claims 1 to 3,
   characterized in that

   the filament (1) prior to winding onto the delivery mechanism (7, 9, 10) is pretreated, in particular by moistening with a liquid, in such a way that it presents relative to the surface of the delivery mechanism (7, 9, 10) in the desired range of sliding friction a coefficient of friction of less than 0.4, preferably of less than 0.25.
5. Method according to one of claims 1 to 4,
   characterized in that

   the filament (1) is delivered to the delivery mechanism by means of a galette (9), the peripheral speed of which is substantially identical to the winding-on speed of the filament (1) onto said galette or is up to 2% higher.
6. Method according to one of claims 1 to 4,
   characterized in that

   the filament (1) is withdrawn from the spinneret (8) and in the process fully or partially stretched by means of the delivery mechanism (7, 9, 10).
7. Method according to one of the preceding claims 1 to 4,
   characterized in that

   the filament (1) prior to running through the delivery mechanism (7) is subjected to a tangle treatment and/or an additional shrinkage treatment.
8. Method according to claim 6,
   characterized in that

   the filament (1) prior to running through the delivery mechanism (7, 9, 10) is subjected to a stretching and/or setting treatment in a heated tube.
9. Method according to one of the preceding claims 1 to 6,
   characterized in that

   between delivery mechanism (7) and the end filament guide (4) of the take-up device (2 to 3) a tangle treatment and/or a shrinkage treatment is effected, preferably with heat treatment of the filament (1).
10. Method according to one of claims 1 to 7,
    characterized in that

    the looping at the delivery mechanism (7) is adjusted in dependence upon the filament tensile strength measured upstream of the delivery mechanism.
11. Method according to claim 6,
    characterized in that

    the filament (1) prior to running through the delivery mechanism (7) is conveyed through a heated, narrow tube (12) and thereby heated up to a temperature of more than 90°C.
12. Method according to claim 6,
    characterized in that

    the delivery mechanism (7, 9, 10) is provided at a distance of less than 3 metres below the spinneret (8) and operated at a peripheral speed of 6000 m/min or more.
13. Method according to claim 11 or 12,
    characterized in that

    between the delivery mechanism (7) and the end filament guide (4) of the take-up device (2 to 3) a shrinkage treatment is effected by supplying heat, in particular by supplying hot or saturated steam.
14. Method of withdrawing a continuous synthetic filament from the filament plug (33) of a spinning/texturing device, in particular a spinning/stretching/texturing device (8, 27-32), by means of a delivery mechanism (9), round which the filament is looped at a looping angle (α), wherein the filament withdrawn from the filament plug (33) winds with a high tension onto the delivery mechanism (9), is subjected at regular intervals to a tangle treatment (knotting) in an air jet (16) and is then wound into a bobbin (2) in a take-up device disposed downstream of the delivery mechanism (9) and the air jet (16),
    characterized in that

    the looping angle (α) and the peripheral speed of the delivery mechanism (9) are adjusted in such a way that the peripheral speed is higher than the winding-on speed of the filament on the delivery mechanism and that there is such a slippage between the surface of the delivery mechanism (9) and the filament that the slippage behaviour of the filament on the surface of the delivery mechanism (9) is identical to the frictional behaviour in the case of speed-independent sliding friction.
15. Method according to claim 14,
    characterized in that

    disposed between the delivery mechanism (9) and the tangle air jet (16) is a looping delivery mechanism (35) which delivers the filament substantially free of slippage.
16. Method according to claim 14,
    characterized in that

    a filament tensioning device is disposed between the delivery mechanism (9) and the tangle air jet (16).

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