EP0131170A1 - Method and device for false spinning - Google Patents

Abstract

A fiber sliver is drafted to a yarn count in a drafting mechanism and is fed to a false twist unit with a sliver width B1 of 10 to 19 mm. In accordance with the method, by means of the width B1, the fiber sliver leaving the delivery roller pair is divided into a yarn core rotated by the false twist member with a spinning triangle of the width B2 and into edge fibers delivered thereto. The edge fibers are taken up by the rotating yarn core in the suction passage of the false twist unit. The taking-up of the edge fibers occurs in that the front ends of the delivered edge fibers are caught by the rotating yarn core in the region of the narrowest portion of the suction passage and are wound about the yarn core with the same rotational direction as the fiber core but with a substantially larger inclination until the rear end of the edge fibers is wound into the yarn core in the spinning triangle. To maintain the width of the fiber sliver, as delivered by the apron pair and determined by the funnel, until catching of the sliver by the nip line of the delivery roller pair, one of the two aprons is extended into the converging space of the delivery roller pair and both aprons are guided so close to the corresponding roller of the delivery roller pair that the spacings between the aprons and the delivery rollers are close to zero. The spacing between the nip line and the narrowest portion of the suction passage is shorter than the average length of the procesed edge fibers, in order to ensure that the rear end of the edge fibers is not released from the nip line before the edge fibers are wound in the spinning triangle.

Description

• - dass ein Faserband in einem Streckwerk auf eine gewünschte Garnnummer verstreckt und als verstrecktes Faserband von einem Ausgangswalzenpaar des Streckwerkes abgegeben wird,
• - dass das verstreckte Faserband anschliessend in einem sich verjüngenden Kanal im wesentlichen spiralförmig angesaugt und anschliessend von einem Falschdrallorgan übernommen wird und
• - dass mittels des Falschdrallorganes ein Teil des verstreckten Faserbandes unter Bildung eines Spinndreieckes zu einem sogenannt falschgedrehten Garnkern gedreht wird,

sowie auf eine Vorrichtung zum Falschdrallspinnen,

• - mit einem ein verstrecktes Faserband an einen Ansaugkanal lieferndes Streckwerk sowie mit einem nach dem Ansaugkanal angeordneten Falschdrallorgan wobei der Ansaugkanal in Richtung gegen das Falschdrallorgan bis zu seiner engsten Stelle hin verjüngt ist.

The invention relates to a method for false twist spinning with the method steps,

• that a fiber sliver is stretched to a desired yarn number in a drafting system and is delivered as a stretched fiber sliver from a pair of output rollers of the drafting system,
• - That the stretched sliver is then sucked in a tapered channel essentially in a spiral and then taken over by a false twister and
• that a part of the stretched fiber sliver is twisted by means of the false twist element to form a so-called wrongly twisted core, forming a spinning triangle,

as well as a device for false twist spinning,

• - With a stretched sliver to one Drafting device providing the suction channel and with a false twist element arranged after the suction channel, the suction channel tapering towards the false twist element up to its narrowest point.

The problems of the yarns produced by the false twist spinning process with regard to further processing into the finished fabric lie essentially in the uniformity, strength and elongation. For example, non-measurable, recurring weak points, even with the highest measured strength of the yarn, are major disadvantages in the slip and weaving processes, or nits also reduce the value of the finished fabric in the case of yarns which are problem-free for the subsequent processing processes.

A method and a device according to the preamble of the first method and the first device claim are known from Swiss Patent No. 615 467.

In this known method, or in this known device, shown schematically and partially in section with FIG. 1, a delivered sliver 2 is calibrated in a drafting device 1 by a funnel 5 or 6 provided in front of a pair of input rollers 3 and in front of an intermediate roller 4 through a pair of straps 8 directed by the intermediate roller pair 4 against an output roller pair 7 (the roller pairs are indicated by dashed lines).

In the converging space of the pair of output rollers 7 there is another funnel 9 for collecting the edge fibers F, resp tive to avoid, as far as possible, that these edge fibers are lost.

In the prior art method, the sliver 2 is released from the pair of straps 8 (only the lower strap is shown) with a width BA and fed to the clamping line K formed by the pair of output rollers 7.

In the converging space of the pair of output rollers 7, the sliver experiences a spread due to the circumferential air of the rotating pair of output rollers which is conveyed into this space and escapes in the axial direction, which is limited to a width BB by the funnel 9.

The difference in the width BB to the smaller width BC of the spinning triangle gives rise to the edge fibers F mentioned, which are sucked into an intake duct 10 and at the latest at the narrowest point of the intake duct, i.e. in front of the throttle point 11 are largely gripped by the rotating, incorrectly rotated yarn core 12. The rotation of the yarn core 12 is caused by the pneumatic false twist element 13 connected downstream of the throttle point 11.

The main disadvantage of this method is insufficient yarn uniformity in terms of mass uniformity, weak points and nits. The strength of the yarn is also much lower than that of normal ring spun yarns. This insufficient uniformity is essentially due to the fact that the fiber spreading mentioned is random and uncontrolled.

It is therefore an object of this invention to provide a method and to provide a device with which a more uniform yarn can be produced in relation to the properties mentioned.

In terms of the process, the object is achieved in that the drawn fiber sliver is released from the output rollers in such a width that only part of the width of the drawn fiber sliver is gripped by the spinning triangle, that is to say it is turned into an incorrectly twisted yarn core, and that the spinning triangle does not grasp it So-called edge fibers are sucked in and guided by means of the intake air flow in such a way that the front end of a fiber with a length corresponding to the average length of the processed fibers, as seen in the direction of conveyance of the yarn core, is then captured by the rotating yarn core if it is ensured that this fiber only then the nip line of the exit roller pair leaves after being rotated around the yarn core in the same direction, but at a steeper slope than the yarn core, until it has been caught in the spinning triangle and thereby the rear end is bound in the yarn core while the device is being tied according to the invention indicates that the drafting device has means in front of its pair of output rollers delivering the fiber sliver to the intake duct, which guide the fiber sliver in the drafting system in such a way that the drawn fiber sliver delivered by the pair of output rollers has a width which is greater than the width of the spinning triangle of the twisted by means of the false twist element Yarn core, and that the distance between the nip line formed by the pair of output rollers and the narrowest point of the intake duct is not greater than the average fiber length of the fibers contained in the fiber sliver, and that the intake duct has a tapered shape such that free front fiber ends, which are not integrated in the rotating twist core produced by the false twist element, and which are delivered by the pair of output rollers and guided in the air stream, are short in front of the narrowest point of the intake duct through the air flow against the rotating yarn core and thereby caught by the rotating yarn core that the rear end of these fibers is still clamped by the pair of output rollers.

Accordingly, the advantages achieved by the invention are a yarn with the aforementioned properties which is more uniform and has high strength. These values are mentioned in the description section in connection with the example given.

In the following, the invention is explained in more detail with the aid of drawings which only show execution routes.

It shows: .

• 2 shows a longitudinal section of the device according to the invention, shown schematically and partly in section,
• 3 shows the part of FIG. 2 shown in section, enlarged and shown semi-schematically in direction I (FIG. 2) in section,
• 4 + 5 + 5a each a variant of the part of Figure 3, shown semi-schematically and in the same direction in section,
• 6-8 each a process step, shown semi-schematically,
• 9 shows the finished yarn, shown semi-schematically,
• 10 shows a strength diagram of the finished yarn as a function of a characteristic characteristic number,
• 11 is a fiber loss diagram of the yarn, depending on a characteristic number,
• 12 shows a variant of the arrangement of FIG. 2,
• 13a to d various value diagrams.

In a drafting device 101 (FIG. 2) is a fiber ribbon 102 in a preliminary drafting zone between an input rollers _- pair 103 and an intermediate roller pair 104, and drawn in a main drafting zone between the intermediate roller pair 104 and a pair of output rollers 105 to a finished yarn count and in a false twist spinning unit 106 (in Section shown) turned into a yarn 107.

The drafting system further comprises a condenser 108 in front of the input roller pair 103 as the first sliver guide element, and in front of the intermediate roller pair 104 as two tes sliver guide element a condenser 109 and in front of the exit roller pair 105 as a further sliver guide element a strap pair 110, consisting of an upper strap 111 and a lower strap 112. The guides of the roller pairs and straps are known per se and are not the subject of the invention.

The condenser 108 serves the primary and the condenser 109 the secondary guidance of the sliver 102. The inside width of these condensers is such that the sliver between the straps has a width Bl of 10-19 mm, preferably for a yarn titer of approx. 15 tex 14 - 15 mm. In order to maintain this width B1 essentially unchanged up to the clamping line K generated by the exit rollers 105, as a first measure one of the two straps of the pair of straps 110 is brought further into the converging space 113 of the exit rollers 105 than the other strap, for example the lower strap 112 .

This measure results in a deflection of the fiber sliver at the deflection point 114 of the apron 112 out of the plane (not shown) in which the clamping line K and the clamping line given by the intermediate rollers 104 (not shown) are contained. This deflection, which is pushed into the converging space 113, also results in additional fiber guidance on a surface piece of the upper roller 105A of the output rollers 105 characterized by the angle β (FIG. 2).

As a further measure for maintaining the width B1, the straps 111 and 112 are guided so close to the corresponding roller of the output rollers 105 that the distances M, respectively. N, are approximately zero, so that the air flow resulting from the rotating output rollers 105 is practically prevented from flowing into the converging space 113.

This further measure supports the first measure, which essentially avoids spreading of the edge fibers, which are designated by F and FA in the prior art described in FIG. 1. The false twist spinning unit 106 connected downstream of the pair of output rollers essentially comprises an intake duct 115, a throttle point 116 known from Swiss Patent No. 615 467 and a pneumatic false twist element 117 with at least one air inflow duct 118.

In operation, as can be seen from FIGS. 3-5a and known from the theory of false twist spinning (also called nozzle spinning), a so-called incorrectly rotated yarn core 119 with a pitch with the angle β (FIG. 7) is created by the rotation generated in the false twist element 117, for example, as shown in Figures 3-5a with an S rotation.

This rotation creates a spinning triangle delimited by the clamping line K with a width B2 (shown in FIGS. 3 and 6) given by the intensity of the rotation, which should be significantly smaller than the fiber bandwidth Bl mentioned earlier, ie the width Bl becomes inherent The resulting width B2, depending on the processed average fiber length and spun yarn titer, is selected in such a way that a sufficient number of edge fibers F is present for the winding around the yarn core 119 is there.

• Nachdem das vordere Ende der Randfasern F vom rotierenden Garnkern 119 erfasst wurde, entsteht, unter der Voraussetzung, dass das hintere Ende der erfassten Faser noch in der Klemmlinie K geführt ist, durch diese Randfaser eine Umwindung des Garnkerns 119 in derselben Drehrichtung, d.h. bei S-Drall des Garnkerns 119, ebenfalls S-Drall der Umwindefaser, jedoch mit einer wesentlich grösseren Steigung mit dem Winkelα. Der Winkel wird allerdings gegen das Spinndreieck hin etwas grösser und kann kurz vor dem Spinndreieck dem Winkelentsprechen.

It was found that the front ends, viewed in the conveying direction R (FIG. 2) of the yarn core 119, of the edge fibers F sucked in by the suction channel 115 (FIG. 2) in a path essentially corresponding to a conical spiral against that at high speed (e.g. 200000 U / min.) Rotating yarn core 119 and are usually detected in front of the narrowest point of the intake duct of the rotating yarn core 119, said web being created by an air vortex generated by the rotating yarn core. The following then occurs, as illustrated with FIGS. 6 to 8:

• After the front end of the edge fibers F has been gripped by the rotating yarn core 119, provided that the rear end of the gripped fiber is still guided in the clamping line K, this edge fiber causes the yarn core 119 to be wound in the same direction of rotation, ie at S Twist of the yarn core 119, also S-twist of the wrapping fiber, but with a much larger pitch with the angle α. However, the angle becomes somewhat larger towards the spinning triangle and can correspond to the angle just before the spinning triangle.

This greater slope is caused by the winding moving around at a higher speed than the advancement of the yarn core in the direction opposite to the yarn advancement, i.e. towards the spinning triangle, and ensures that the rear fiber end is still covered by the clamping line K that this end is screwed into the spinning triangle, so that the rear fiber end subsequently released by the clamping line K remains in the yarn core of the finished yarn.

The slope is so much steeper than the speed of the mentioned hiking is great. In order to ensure that the rear fiber end is twisted into the spinning triangle, the distance D between the narrowest point of the intake duct 115 and the clamping line K must be less than the length of the edge fiber F. If the front fiber end is twisted too early, the wrapping length of the edge fiber can be such shorten that the wrapping strength given by the adhesive length of the wrapping fiber is not sufficient to give the finished yarn sufficient tensile strength.

Furthermore, it has been shown that the spinning triangle is repeatedly and variably divided into smaller spinning triangles with the different width b2 (FIG. 6a), so that the edge fibers F not only have to occur in the edge parts of the width B1, but edge fibers F also of the entire width B1 are distributed outside and between the individual small spinning triangles.

• g_{anzheitliches S}p_inndreieck: B_{1 = 10 - 30 %>} B₂ aufgeteiltes Spinndreieck: B₁ = 10 - 30 %>Σb₂

In comparison to the holistic spinning triangle explained with Figs. 6 - 8, the following relation can be established:

• g In _{spine triangle:} B _{1 = 10 - 30%>} B ₂ split spinning triangle: B ₁ = 10 - 30%> Σb ₂

This division into small spinning triangles results from the tendency to keep the fiber density in the clamping gap K so low that the free edge fibers F already mentioned which are not contained in the spinning triangle can occur.

The division into small spinning triangles has the advantage that these edge fibers, as shown in FIG. 6a, can be distributed over the width B1, which results in a statistically uniform occurrence of these edge fibers F.

It is also possible that certain fibers a spinning triangle forming the fiber structure leaving the nip line K is a still not included in the spinning triangle, namely, for example, when the adhesive force between these fibers and the rolls ^g roasting ser than to the other, the spinning triangle forming fibers. Such fibers, like the so-called edge fibers F, remain free with their front ends until, like the edge fibers F, they are caught by the rotating yarn core 119 and likewise form wrapping fibers.

Furthermore, the optimal distance D should correspond to approximately 70% of the average spun fiber length, but should not be less than 60% of this average fiber length. The usable range for the distance D is 60-75% of the average spun fiber length.

The finished yarn is passed from a take-off roller pair (not shown) provided after the false twist unit to a bobbin unit (not shown) from a substantially untwisted yarn core 120 (FIG. 9), which is held together by surrounding fibers F, now called winding fibers F1.

The slope a A (FIG. 9) of these wrapping fibers F1 essentially corresponds to the slope difference d (FIG. 7), which results from the difference between the slope (β) of the yarn core 119 and the slope (α) of the edge fibers F. However, the winding direction of the wrapping fibers F1 is opposite to that of the edge fibers F, i.e. if the edge fibers in front of the swirl organ had an S direction, the wrapping fibers had a Z direction. During the untwisting, the wound fibers have a position over part of their length and for a short moment, which is parallel to the longitudinal axis of the yarn core, until they increasingly take on the opposite direction of twist as the untwisting continues.

The advantages of this method compared to the previously known methods result from the fact that by grasping the front free fiber end and wrapping around it during a time in which the rear end of the edge fibers is still held by the clamping line K, the wrapping underneath a certain tension of the edge fibers happens and in the further the rear end is clearly and firmly wrapped in the yarn core and held there. By winding under tension, a tight winding is created, in which the winding fibers are under a certain pretension within their stretch, so that when the yarn core is untwisted, not only the extension of the yarn core and the enlargement of the yarn core diameter increase In addition, the pre-tensioning helps that the wrapping fibers do not detach from the core fibers in the transition position, in which they are partly parallel to the Garnachse for a short time.

This pretension can neither arise in those processes in which the fiber end belonging to the wrapping part of the fiber is freely protruding during the unwinding process, nor in those processes which guide the edge fiber parallel to the core fibers according to the clamping line and the wrapping without inclusion of one or the other End of the wrapping fibers happens.

The fact that the width .B <, which can be selected, for example, by the action of the condenser 108, 109, also contributes to the advantages mentioned can provide a sufficient and secure number of edge fibers F which are essentially constant over time for the winding.

FIG. 4 shows a variant of the false twist unit 106 in that a suction part 123 is provided between the suction channel 115A and the throttle point 116. This suction part consists of a short space 124 connecting the suction channel 115A and the throttle point 116 and a suction hole 125 connecting this space to the surroundings of the false twist unit. A suction system (not shown) is connected to this suction hole, with which one of the suction systems is sucked in by the false twist element , additional air volume is sucked in through the intake duct 115A.

This additional amount of air serves to increase the air speed in the intake duct, so that the spiral shape shaped path in which the front ends of the fibers F _R andfa- be promoted, receives a greater slope. This larger slope, respectively higher suction speed, rather ensures that the front fiber ends mentioned are better aligned and are not detected too early, but as close as possible to the narrowest point of the suction duct 115A mentioned. This suction also reduces possible edge fiber loss between the pair of output rollers 105 and the inlet of the intake duct.

FIG. 5 shows, with the intake duct 115B, an additional variant of the intake duct in this latter endeavor of the fiber end guide. This intake duct 115B is designed in a bell-shaped manner such that the tendency that the fiber ends mentioned are caught too early by the rotating fiber core 119 can be additionally counteracted.

5a, the front ends of the marginal fibers F are fed to the suction channel 115C in the upper region E, and are guided in the central region M in such a way that they are as narrow as possible for as long as possible without being caught by the rotating fiber core 119 of the intake duct 115C and are guided in the lower region U into a position in which the ends of the edge fibers F are more likely to assume a position parallel to the yarn core. In this latter position, the ends of the edge fibers F can be better grasped by the fiber ends (not shown) projecting from the rotating yarn core than in a position perpendicular to the fiber core.

However, the intake duct is not limited to the shapes shown in Figs. 4-5a. Variations of this can be optimized through trials. Likewise, the suction bore 125 can open tangentially into the intermediate space 124 in such a way that the aforementioned rotation of the intake air is supported.

There were spinning tests with the false twist spinning units specified below. Suction channels performed. The yarn values listed are partially range values and serve as comparison values because they were always measured with the same method or with the same device.

• - Streckenband 3000 tex; 65% PES (Faserlänge 40 mm)/ 35% gekämmte BW. (PES = Polyesterfaser/BW = Baumwollfaser)
• - Garn 16 tex
• - Bandbreite Bl: 15 mm
• - Lichte Weite W (nur in Fig. 4 und 5a gezeigt): ca. 22 mm
• - Durchmesser 0 (nur in Fig. 4 gekennzeichnet) der engsten Stelle des Ansaugkanales 115A, 115B und 115C: 2,5 mm
• - Drosselstelle 116 a) Durchmesser: 0,8 mm b) Länge: 3 mm
• - Angesaugte Luftmenge:
  • a) betreffend Ansaugkanal 115: ca. 5 Normalliter/min.
  • b) betreffend Ansaugkanäle 115A, 115B, 115C: 23-25 Normalliter/min.
• - Streckwerksanordnung gemäss Fig. 2. Weiter sind die angegebenen CV_Uster -Werte Massengleichmässigkeitswerte, d.h. je grösser der Wert desto schlechter die Gleichmässigkeit.
  
  Spinnen mit einem Durchmesser 0 (Fig. 4) der engsten Stelle von mehr als 2,5 mm ist möglich, gibt jedoch mit zunehmendem Durchmesser 0 progressiv schlechtere Werte. Beispielsweise sind die Werte bei einem Durchmesser Ø von 4 mm deutlich schlechter.

The following values remained unchanged in connection with this experiment:

• - stretch band 3000 tex; 65% PES (fiber length 40 mm) / 35% combed BW. (PES = polyester fiber / BW = cotton fiber)
• - yarn 16 tex
• - Band width Bl: 15 mm
• Clear width W (only shown in FIGS. 4 and 5a): approx. 22 mm
• - Diameter 0 (marked only in Fig. 4) of the narrowest point of the intake duct 115A, 115B and 115C: 2.5 mm
• - Throttle point 116 a) Diameter: 0.8 mm b) Length: 3 mm
• - Air intake:
  • a) regarding intake duct 115: approx. 5 normal liters / min.
  • b) regarding intake ducts 115A, 115B, 115C: 23-25 normal liters / min.
• - Drafting arrangement according to FIG. 2. Furthermore, the specified CV _Uster values are mass uniformity values, ie the larger the value, the poorer the uniformity.
  
  Spinning with a diameter 0 (FIG. 4) of the narrowest point of more than 2.5 mm is possible, but gives progressively worse values with increasing diameter 0. For example, the values with a diameter of 4 mm are significantly worse.

On the other hand, it has been shown that with a diameter of 2.5 mm, finer and coarser yarns, for example 8 tex and 30 tex, are spun with good yarn values can.

Diameter 0 values of less than 2.5 mm require higher negative pressures (higher output) for the same air flow rate (liters / min.) And, depending on the value, result in such an increased air speed that free front fiber ends may not be able to rotate from the rotating yarn core , but are detected by the suction air, so that the corresponding edge fiber F is fed as an outlet to the suction system.

The relationship between vacuum Δ _P (at the narrowest point) and diameter Ø value d (Fig. 4) can be expressed for a given exhaust air flow using the following formula:

The influence of the bandwidth B1 on the yarn values shown with FIGS. 10 and 11 relates to the aforementioned stretch of 3000 tex and to the yarn of 16 tex, spun with a false twist unit according to FIG. 4.

From FIG. 10 the strength values in kilometers of travel (Rkm) can be seen from the ordinate and the bandwidth B1 from the abscissa. It can be seen that the Rkm value begins to stabilize from a bandwidth of 14 mm B1.

11 shows the fiber losses in grams per hour from the ordinate and the bandwidth B1 from the abscissa.

A comparison of the two diagrams shows that a bandwidth B1 of 15 mm is optimal for this yarn.

A broad fiber distribution between the aprons also has the advantage of better fiber distribution in this warping zone which performs the main warping. This better fiber distribution results in a more even warping in this zone and a longer apron life.

Different yarn numbers and different fiber lengths result in different dimensions of the spinning triangle and accordingly require different bandwidths Bl. The optimal bandwidth Bl must be determined from case to case. For example, with the false twist spinning unit according to FIG. 4 it was found that an optimal width B1 for a yarn of 8 tex is between 10 and 12 mm and for a yarn of 30 tex between 15 and 19 mm.

Furthermore, it has been shown that a loop, characterized by the angle λ (FIG. 2), supports one of the two output rollers by the fiber sliver to separate the edge fibers from the spinning triangle. This looping can be achieved either by, as shown in FIG. 2, the false twist spinning unit 106 with the angle A deviating from an imaginary plane tangential to the clamping line K, or by the false twist spinning unit as shown in FIG 106 is arranged offset parallel to the plane mentioned. The offset (Fig. 12) _- st measured in millimeters.

In the latter arrangement, spinning tests were carried out to determine the influence of a deviation from the optimal distance D. The tests were carried out using a false twist spinning unit according to FIG. 4 offset parallel to the aforementioned plane by 5.5 mm and the unchanged values mentioned for the test described earlier. The results of these tests are shown graphically with FIGS. 13a-d. The abscissa of FIG. 13d also applies to FIGS. 13a-c and shows values for the distance D in percentages above and below the optimal distance of 70% of the average fiber length. The ordinates of FIGS. 13a-d show the CV-Uster value, the number of nits per 1000 m with a setting level 3, the travel kilometers Rkm (CN / Tex) and the departure in percent. These values are internationally standardized measurement methods.

The diagrams show that as the distance decreases, the CV-Uster value, the number of nits and the drop in the area shown are reduced in an essentially linear function, while the distance traveled Rkm before and after the optimal distance D is reduced.

Ultimately, the false twist element need not be pneumatic, as shown in FIGS. 2-5a, but it is quite possible that following the intake duct 115A or. 115B, resp. 115C, a purely mechanical false twist device (not shown) is used. The essential inventive concept of the relation of the width B1 to the length D is also in use of a purely mechanical false twist device.

The invention defined by the claims is therefore not restricted to the use of a pneumatic false twist device.

Claims (20)

l. Process for false twist spinning with the process steps, - that a fiber sliver is drawn in a drafting device (101) to a desired yarn number and is released as a drawn fiber sliver from a pair of output rollers (105) of the drafting device (101), - That the stretched sliver is then sucked in a spiral in a tapered channel (115 - 115C) and then taken over by a false twist element (117) and that a part of the stretched fiber sliver is turned by means of the false twist element to form a so-called wrongly twisted yarn core (119), forming a spinning triangle,
characterized, - That the drawn fiber sliver is released in such a width (Bl) from the output rollers (105) that only part of the width (Bl) of the drawn fiber sliver is grasped by the spinning triangle, ie is twisted to an incorrectly twisted yarn core (119) and - That the so-called edge fibers (F) not captured by the spinning triangle are sucked in and guided by means of the intake air flow in such a way that, seen in the conveying direction (R) of the yarn core (119), the front end of a fiber with a length corresponding to the average length of the processed fibers then is detected by the rotating yarn core (119) if it is ensured that this fiber only leaves the nip line (K) of the output roller pair after it has been rotated around the yarn core (119) until it has been caught in the spinning triangle, whereby the rear End in the yarn core (119). 2. The method according to claim 1, characterized in that the width (B ₁ ) of the drawn fiber sliver is 10 - 30% larger than the width (B ₂ or ε b ₂ ) of the spinning triangle. 3. The method according to claim 1 and 2, characterized in that the width (B ₁ ) of the drawn sliver is achieved by a correspondingly wide guide of the sliver in front of the input roller pair (103) and in front of the output roller pair (105) and preferably that the sliver is additionally guided in a correspondingly wide manner in front of the pair of intermediate rolls (104). 4. The method according to claim 1 and 2, characterized in that the sliver (102) is guided directly into the converging space (113) of the pair of output rollers (105). 5. The method according to claim 1 and 2, characterized in that the penetration of the peripheral air of the rotating output rollers in the converging space (113) is substantially prevented. 6. The method according to claim 1, characterized in that the front edge fiber end is detected by the rotating yarn core when the fiber has 60 to 75%, preferably 68 to 72% of the average fiber length of the processed fibers has left the clamping line (K). 7. The method according to claim 1, characterized in that the false twist element is a false twist nozzle (117) and the intake air flow is generated by this false twist nozzle (117) and, if appropriate, that the intake air flow is complementary to the false twist nozzle (117) by a between the false twist nozzle and the tapering channel (115) provided suction part (123) is generated. 8. The method according to claim 7, characterized in that the intake air flow is given a rotation, so that the sucked-in free ends of the edge fibers (F) on the way to the area in which they are caught by the rotating yarn core (119) in rotation are displaced around the yarn core and are subjected to a force directed against the wall of the intake duct by the centrifugal force thus created, so that these fiber ends reach the area mentioned on a conical spiral path around the yarn core (119). 9. The method according to claim 8, characterized in that this rotation of the intake air is generated by the rotating yarn core itself and optionally that the rotation of the intake air is additionally generated by a suitably designed suction part (123). 10. Device for false twist spinning with a drafting device (101) delivering a drawn fiber sliver to an intake duct (115 to 115C) and with a false twist member (117) arranged after the intake duct, the intake duct tapering in the direction towards the false twist member to its narrowest point is
characterized, - That the drafting system (101) before its that Fibrous sliver to the outlet roller pair (105) delivering the suction channel (115-115C) has means which guide the sliver in the drafting system in such a way that the drawn sliver delivered by the outlet roller pair (105) has a width (B1) which is greater than the width ( B ₂ or ε b ₂ ) of the spinning triangle of the yarn core (119) rotated by means of the false twist element and - That the distance (D) between the clamping line (K) formed by the pair of output rollers (105) and the narrowest point of the intake duct (115 to 115C) is not greater than 75% of the average fiber length of the fibers contained in the fiber sliver and - That the intake duct (115 to 115C) has such a tapered shape that free, in the rotating yarn core (119) generated by the false twist element, not included, delivered by the pair of output rollers (105), guided in the air flow, front fiber ends just before the narrowest point of the intake duct guided by the air flow against the rotating yarn core (119) and thereby captured by the rotating yarn core (119) in the area of the distance (D). 11. The device according to claim 10, characterized in that said means each in front of a pair of input rollers (103) respectively. vorese in front of the pair of output rollers (105) of the drafting system (101) henes sliver guide element (108 and 110) are, for example, that the sliver guide element provided in front of the input roller pair (103) is a condenser (108) and that the sliver guide element provided in front of the output roller pair (105) is a pair of straps (110). 12. The apparatus according to claim 11, characterized in that the sliver guide element (110) provided in front of the pair of output rollers projects into the converging space (113) of the pair of output rollers (105). 13. The apparatus according to claim 12, characterized in that one of the two straps protrudes further into the converging space (113) than the other straps and both straps (111 and 112) are guided so close to the corresponding roller of the output rollers (105) that the distances (M or N) between the aprons and the corresponding rollers are almost zero. 14. The apparatus according to claim 10, characterized in that one of said means is a sliver guide element (109) provided in front of an intermediate roller pair (104), and is preferably a condenser. 15. The apparatus according to claim 10, characterized in that the distance (D) between the clamping line (K) and the narrowest point of the intake duct is 60-75% and preferably 68-72% of said average fiber length. 16. The apparatus according to claim 10, characterized in that the false twist element (117) is designed such that the intake air flow is generated by the false twist element. 17. Device according to one of claims 10-16, characterized in that the narrowest point of the intake duct (115) is a throttle point (116) provided between the intake duct and swirl element (117). 18. The apparatus according to claim 17, characterized in that between the intake duct (115A, 115B and 115C) and throttle point (116) a suction part (123) is provided, which increases the intake air flow and preferably that the narrowest point of the intake duct (115A, 115B and 115C) is the diameter of the suction part (123) adjoining it. 19. The apparatus according to claim 18, characterized in that the suction part comprises a space (124) adjoining the suction channel with a suction hole (125), and preferably that the suction hole (125) opens tangentially into the space (124). 20. The apparatus according to claim 10, characterized in that the suction channel is a substantially uniformly tapering channel (115, 115A) or a substantially bell-shaped tapering channel (115B) or a substantially flower cup-shaped tapering channel (115C).

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