EP1664404B1 - Device for the production of rove by means of a pneumatic spinning process and use of such an device - Google Patents

Description

The present invention relates to a roving machine for producing a roving to a fiber structure, as well as the use of a swirling agent, which operates by an air spinning process.

Such devices are known in the textile industry. The roving machines according to the present invention include in particular the so-called flyers. The flyers are used to produce roving or for producing a so-called roving roving. The roving serves as a template for the spinning process, d. H. for spinning the fibers into a fiber yarn, for example on a ring spinning machine. The slivers coming from the Vorwerk (Karderie) are usually first doubled with the help of drafting equipment and placed in pots. The resulting strip conveyor is then presented to the roving for further processing. The conveyor belt is warped in these roving usually first in its own drafting and then slightly twisted by a corresponding twisting before the original sliver is wound up as a roving on a supply spool.

The resulting roving (also known as roving, flyer roving or general lath) usually serves as a template for ring spinning machines. The roving usually has its own drafting, usually a Doppelriemchen-drafting. After being warped by the drafting system of the roving machine, the fiber structure is given a slight twist (so-called protective rotation), so that the resulting lint has a certain strength and can be wound up on a spool and does not disintegrate. The given rotation may only be so high that the cohesion of the fiber structure for the winding and rewinding and the transport of the coils is strong enough so that in particular no Fehlverzüge (thin spots in the roving). On the other hand, the rotation must be easily resolved or The roving must be delayable, so that the subsequent spinning process, eg. B. in a ring spinning machine, can be accomplished.

As roving the so-called flyer is usually used, which produces the corresponding flyer fly. This roving machine is equipped with a drafting system and a spindle for winding the Flyerlunte on a cylindrical coil by means of a wing to support the fuse against the centrifugal force caused by the spindle speeds. The flyer is an expensive machine in the entire spinning process, especially because of the complicated winding mechanism. In addition, the usual performance of a flyer at 20 - 25 meters roving per minute is. However, this low production can not be increased in view of the flyer system with flyer wings, since a higher speed is limited by the centrifugal force that the wings and the roving bobbin have to endure.

It has therefore been tried by the so-called direct spinning, bypassing the roving, in which the template for the ring spinning machine consists of conveyor belt. The high delay due to the so-called straight-line direct spinning, only partially achieves the result which is achieved when presenting a Flyerlunte on the ring spinning machine. This is especially true when fine yarns are spun with Nm 50 and finer. In addition, the presentation of route cans in the ring spinning machine is complicated and complicated.

One way to replace the flyer is in the published patent application EP 375 242 A2 disclosed. Therein is shown a machine for making a fiber yarn roving having a swirl imparting means with a rotating rotor. The rotor has on its axis of rotation a continuous longitudinal bore through which is guided to the twisting fiber structure. The rotor has at a certain height a plurality of rotationally symmetrically arranged holes extending in the radial direction. These radial bores connect the longitudinal bore through which the fiber strand is guided to the outer surface of the rotor. This outer surface of the rotor is exposed to a vacuum or a strong negative pressure. If the fiber structure is now pulled through the longitudinal hole, Thus, individual free fiber ends are sucked from the surface of the fiber structure in these radial holes. In operation, the rotor rotates while the fiber strand is pulled through the longitudinal bore. The fiber ends located in the radial bores are thereby wound around the moving fiber structure, whereby a rotation (real twist) is given to the fiber structure or individual fibers thereof.

The device according to the cited document is relatively expensive to produce and to operate because of the mechanical elements (rotating rotor) and the vacuum technology.

For the production of yarns, it is for example from the DE 32 37 989 C2 It is known to distort a roving or a stretched strip in a drafting system and then to impart a twist to the distorted fiber structure, the twisting being effected by air jets in two successive twisting chambers.

The swirling action in the first pneumatic swirl chamber is opposite to that for further subsequent swirling in the second swirling pneumatic chamber (the first swirling causes left turn, for example, while the subsequent swirling in the second swirling chamber causes clockwise rotation). In this way, a yarn is produced by the so-called false-twisting method).

According to the patent CH 617 465 , a false-twist nozzle is used to make a staple fiber yarn (also a false-twisting method).

In the production of a yarn - in a spinning process, therefore - the individual fibers are so strongly spun or twisted together that the rotation is quasi irreversible and the yarn produced is no longer malleable. This solidification produced by the twist is also necessary for the yarn, because only then does it receive the required high tensile strength. However, this has the consequence that said devices and spinning processes are not suitable for forming a roving. The roving has only a so-called protective rotation, which is the further spinning process on the following machines (eg, distortion on the ring spinning machine) must not hinder, ie the roving must remain delaying. The devices shown in these two documents are therefore suitable only for the production of yarns and not of warping roving. An apparatus for producing a roving according to the preamble of claim 1 is characterized by EP 0174 112 A1 disclosed.

Object of the present invention is to provide a roving and a method for producing a roving, in which the above-mentioned disadvantages of conventional roving can be avoided and in which a roving is produced, which has the properties of conventional Flyerlunten or rovings, this in particular concerns the delay of the produced roving.

This object is solved by the features in independent claims 1 and 8. By using a roving machine with a twisting distribution means according to the invention, it is possible to eliminate the disadvantages of the prior art, i. H. in particular to provide a roving machine with a higher production capacity.

Advantageous embodiments and embodiments of the invention can be found in the dependent claims.

In the following the invention, the concept of the invention, as well as the operation of the invention will be explained with reference to embodiments shown in FIGS. However, it should be expressly pointed out that the invention or the inventive concept is not limited to the embodiments shown in the examples.

The FIG. 1 schematically shows a spinning station 1 of a roving machine (entire roving not shown) according to the invention. This possible embodiment of the invention has a drafting system 2 (also shown schematically) which is supplied with a fiber structure 3 (for example a doubled stretched strip). The (stretched) fiber structure 3 then passes from the drafting system into the twist distribution means 4. In the twist distribution means 4, the fiber structure 3 becomes a roving 9 twisted, ie the fiber strand is at least partially (ie at least a portion of the fibers of the fiber structure) granted a real spin. In addition, the shows FIG. 1 a take-off roller pair 8 with a nip line 34 and a winding device 7 (also shown schematically) for the roving 9. The inventive device does not necessarily have a drafting 2, as shown in FIG. 1 In addition to the drafting system 2 or instead of the drafting system 2 may be provided within the same machine (hereinafter called "combination") an actual conventional route (not shown). Such a route roving machine combination has the advantage of a process shortening.

• vorzugsweise beträgt der Durchmesser der Drall- bzw. Wirbelkammer mindestens 5 mm (siehe Wirbelkammer 5 in den im Folgenden beschriebenen Figuren)
• vorzugsweise beträgt die Liefergeschwindigkeit des Faserverbandes (ab Auslaufwalzen Streckwerk) mindestens 200 m/min
• vorzugsweise beträgt der Druck der Luftströmung, bevor sie durch die Düsenbohrungen oder Düsen in die Wirbelkammer einströmt, höchstens 5 bar (siehe Luftströmung 32, 16, 16.1, 16.2, oder 20, sowie Düsenbohrungen bzw. Düsen 11 in den im Folgenden beschriebenen Figuren)
• vorzugsweise erteilen diese Luftspinnvorrichtungen dem Vorgarn bzw. der Lunte eine tiefe Umwindedrehung, bevorzugt beträgt die Umwindedrehung bzw. der Drehungskoeffizient α_m weniger als 100.

The twist distribution means 4 operates according to the so-called vortex method, a special air spinning method. The vortex air spinning process is known per se as a yarn spinning process. As already mentioned above, devices for yarn formation are in themselves unsuitable for the production of a warpable roving. Surprisingly and unexpectedly, experiments with suitably modified air-spinning devices have shown that certain air-spinning processes are also suitable for the production of rovings. However, the dimensions and flow conditions of conventional yarn air spinning devices must be adjusted. The twisting agents according to the invention only have to impart a protective rotation to the fiber structure, so that the sliver or roving formed thereby remains delayable. Conventional conventional air spinning devices rotate the fiber strand to form a yarn that is twisted so much that the twist is irreversible and in particular is no longer malleable. By a correspondingly larger dimensions of the air spinning devices, as well as an adjustment of the flow conditions and above all by suitably high delivery speeds, can be produced with air spinning devices also retractable rovings or Lunten. The corresponding conditions can best be determined experimentally.
According to first attempts, air-spinning devices for rovings preferably have one or more of the following properties:

• Preferably, the diameter of the swirl or swirl chamber is at least 5 mm (see swirl chamber 5 in the figures described below)
• Preferably, the delivery speed of the fiber structure (from the outlet rollers drafting) is at least 200 m / min
• Preferably, the pressure of the air flow, before it flows through the nozzle bores or nozzles in the vortex chamber, at most 5 bar (see air flow 32, 16, 16.1, 16.2, or 20, and nozzle holes or nozzles 11 in the figures described below)
• These air-spinning devices preferably give the roving or the sliver a deep twisting rotation; the twisting rotation or the rotation coefficient α _m is preferably less than 100.

The mode of operation of the device according to the invention for forming a roving is similar to the mode of operation of conventional air spinning methods for yarn formation. For this reason, the air spinning process is not discussed in great detail here. In contrast to conventional air spinning devices, in the devices and methods according to the invention, only one protective rotation is given to the fiber structure or roving. This protective rotation is such that the roving remains delayable for the further processing process and the rotation distribution could even be reversed. It is or would therefore be reversible in contrast to the rotation, which a fiber structure with conventional d. H. would be granted known air spinning devices. To form the roving, the fiber strand is at least partially given a true twist, d. H. at least a portion of the fibers of the fiber strand, if not all, receive a real twist (twist) by means of an air flow. This real spin or this rotation is as mentioned only a protective rotation. The roving or sliver produced according to the invention therefore has the same properties as a sliver produced with a conventional flyer.

The statements just made apply, of course, to all inventive twist distribution means of this document, which are shown and explained below with reference to further figures. These statements are therefore not only valid for the twist distribution means 4 of the FIG. 1 , but also for those twisting means with the reference numerals 18 and 31.

One of the possible inventive twisting means for the formation of roving is the already mentioned article 4 FIG. 1 , As already mentioned, the twist distribution means 4 operates according to the so-called vortex air-spinning method. The device 4 has for this purpose a fiber guide element 10 with which the fiber structure 3 is supplied into the swirl chamber 5 of the swirl-issuing means 4. In the vortex chamber 5, a fluid device (not shown) generates an air flow 32 or a vortex flow by means of one or more nozzle bores 11. The resulting turbulence within the vortex chamber 5 causes individual free fiber ends 12 on the surface of the fiber structure 3 around the inlet mouth 13 of the roving forming element 6 and - detected by the rotating vortex flow in the vortex chamber - rotate about the core 14 of the fiber structure. As a result, the fiber structure 3 in the vortex chamber 5 is given a real twist by means of an air flow 32 at least partially (ie at least part of the fibers). This air flow causes so that at least a portion of the fiber structure, ie individual fibers, a real spin or a true rotation about a core of largely parallel permanent fibers is granted. The resulting thereby at the inlet mouth 13 roving 9 is withdrawn for example via a pair of take-off rollers 8 and wound on a winding device 7. For this purpose, the roving forming element 6 has a bore (see FIG. 1 ). The winding device 7 in the FIG. 1 is shown only schematically. For example, the winding device may be a cross winder, a precision cross winder, a wild cross winder, a step precision winder, or a parallel winder.

The FIG. 2 shows the twist distribution means 4 from the FIG. 1 in a different view. Particularly well recognizable in this figure, as the fiber structure 3 is guided by the fiber guide element 10 in the swirl chamber 5, where a vortex air flow generated by the nozzle holes 11 detects the free fiber ends 12 of the fiber structure 3 and surrounds the inlet mouth 13 of the roving 6. The around the inlet mouth 13 legend free fiber ends 12 form a around the core 14 of the fiber structure rotating "sun". The free fiber ends 12 thus rotate about the core 14 of the fiber structure, whereby the fiber structure 3 in the vortex chamber 5 at least partially receives a real twist (rotation) due to the air flow. The roving 9 thus produced at the inlet mouth 13 is drawn off by the roving forming element 6 (eg a spindle as shown here) (see arrow).

The FIG. 3 shows another not according to the invention Drallerteilungsmittel 15, which, however, has no roving forming element. The twist distribution means 15 (shown schematically) also has a vortex chamber 5, in which by means of one or more nozzle bores 11, an air flow 16 (vortex flow) is generated. By means of this air flow 16, the fiber structure is given a real twist at least partially in the vortex chamber 5.

The true twist distribution (true rotation in fiber structure) is in the FIG. 3a represented: within the vortex chamber 5, the fiber stream 3 is given by the air flow 16, ie at least a portion of the fibers of the fiber structure 3 are rotated, so that the fuse 9 is formed.

The FIG. 3b shows a variant of the not according to the invention Drallerteilungsmittels according to the FIG. 3a , The swirl-distributing means 17 has two swirl chambers 5 each having no roving forming member. The true twist distribution is also done here by means of or in this case two air flows 16.1 and 16.2. At least a part of the fibers of the fiber structure 3 receives a real twist (rotation). Again, the roving 9 and the fuse is withdrawn and wound by a device, not shown. Preferably, the swirl-dividing means 17 has a plurality of nozzle bores 11. The nozzle bores 11 serve to generate the air flows 16.1 and 16.2. The nozzle holes are aligned so that the exiting air jets together and together generate the air flow 16.1 and 16.2, respectively. For this purpose, the entry angles of the nozzle bores 11 within the respective vortex chamber 5 are preferably the same. The air flows 16.1 and 16.2 are also rectified, ie that the two air flows 16.1 and 16.2 - despite separate vortex chambers - the same direction of rotation (right or left-handed air flow).

In general, care is taken in all embodiments of the invention, that the nozzles or the nozzle bores 11 are aligned so that the exiting air jets are rectified, so as to produce together a rectified air flow with a sense of rotation. Preferably, the individual nozzles or nozzle bores are arranged rotationally symmetrical to each other.

The twist distribution means according to the invention preferably also have one or more twist-blocking elements. Spin dam elements can have different occurrences. A twist dam element can be designed, for example, as an edge, as a pin, as a twisted surface, as a cone or in the form of a plurality of steering means.

The FIG. 4 shows a twisting distribution means 18 with a twist dam element in the form of a pin 19. The remaining elements of FIG. 4 correspond largely to the embodiments already described and accordingly have the same reference numerals. The pin 19 in the FIG. 4 serves as a twist dam element as well as a wrong twine core. Swirl-jam elements serve to prevent a rotation in the fiber structure from propagating further backwards. In particular, this prevents any false rotation from occurring and thus at most no real twist is given to the fiber structure. The use of twist dam elements for the devices and methods according to the invention is not necessarily necessary, but is recommended. In particular, the real twist distribution is thereby improved by means of the air flow.

As in the FIGS. 4a and 4b is shown, prevents a pin 19, that the rotation generated by the air flow propagates further back towards the entrance of the fiber guiding element in the fiber structure 3. This is especially good in the Figures 4a, 4b and 4c Recognizable: The air flow 20 around the mouth of the roving forming element (not shown) generates a twist or a twist within the fiber structure 3. By the presence of the pin 19 as a twist dam element The rotation of the fibers is prevented from transferring to the fiber structure 3 which lies on the fiber guiding element 10 or 21 (see parallel untwisted fibers on the fiber guiding elements 10 and 21 in the figures).

As a twist dam element can also serve a twisted fiber guide surface 21. The FIG. 4b shows a twisted fiber guide surface 21, which additionally has a pin 19. This makes the twist-jam function particularly effective. A twisted fiber guide surface 21 with pin is also in the Figure 4c shown. The elements of Figure 4c correspond largely to the elements of the FIG. 4b with the difference that the pin 19 of the Figure 4c is dull.

The FIG. 5 shows a fiber guide element 10 with a so-called twist stop cone 24. The twist stop cone 24 performs the function of the twist dam element. The effect is the same as the pin 19: cone or pin also serve as so-called false yarn cores. The fibers or the fiber structure spirals around the wrong yarn core, whereby the propagation of the rotation opposite to the withdrawal direction of the roving or fiber structure is prevented.

As a twist dam element, only a twisted fiber guide element 22 without pin can serve. This is for example in FIG. 6 shown (compare with Figure 4c ). A twisted fiber guide surface is sufficient in itself as a twist dam element. The additional use of a pin is not absolutely necessary. Various views of a tortuous fiber guide element without pin 22 is in the Figures 6a and 6b given. As a twist dam element can also serve only one edge 33, which need not necessarily be preceded by a twisted fiber guide surface.

The FIG. 7 shows further twist dam elements, which could find use in the inventive device. The figure shows a fiber guide element 23 with a plurality of steering means. These steering means 26, in addition to their function to direct the fiber structure 3, also the effect of a twist stop. In the figure, it can be clearly seen how the steering means 26 with twist-jamming function: the fiber structure 3 is pulled in the untwisted state in the direction of the roving-forming element 6. In the Mouth of Vorgarnbildungselementes 6, the free fiber ends 12 are rotated by the air flow 20 of the vortex chamber by means of true twist distribution. The rotation of the free fiber ends 12 creates a torsional moment which tries to propagate against the withdrawal direction (arrow) of the roving in the fiber structure 3. Due to the presence of the steering means 26 with twist-jam function, this torsional moment or the rotation which would cause the torsional moment in the fiber structure is jammed or stopped. This means that no rotation propagates into the fiber structure 3 (see illustration FIG. 7 : fiber strand 3 is undiluted). In this way, a real twist (rotation) is given to the fiber structure 3 by means of the air flow 20, whereby the roving 9 is formed.
Without the steering means 26 with twist-blocking function, the rotation would propagate into the fiber structure 3 in the fiber structure 3, whereby a so-called false rotation would arise, which may prevent a true rotation of the fiber structure or the roving. Another illustration of the conditions just explained is in the Figure 7a It can also be seen that the fiber structure 3 remains undrilled thanks to the steering means 26.

The FIGS. 8a and 8b show steering means with twist accumulation function of different shape. The FIG. 8c shows a view of the steering means 27 and 28 in the withdrawal direction of the roving and the fiber structure. There are various forms for the steering means with twist-jam function conceivable. The steering means 26, 27 and 28 shown represent only some of the possible shapes.

The roving machine according to the invention may preferably also have a means which determines the width of the fiber structure prior to entering the swirling agent. These means may be, for example, funnels or other forms of condenser. Such a means 29 is in the FIG. 9 shown. The figure shows a funnel 29, which limits a fiber structure 3 in its width and feeds a twisting distribution means 31. Such a funnel 29 or other condenser may for example be arranged downstream of an outlet roller pair 30. The outlet roller pair 30 is shown in a plan view. The reference numeral 34 indicates the nip line of the outlet roller pair 30.

As described above in the exemplary embodiments, the roving machine according to the invention, in particular flyers, for producing a roving from a fiber structure, has a special swirl-distributing means. The special twist-dispensing means of the roving machine according to the invention twists a sliver into a roving. For this purpose, the twist distribution means according to the invention has a vortex chamber with a roving formation element contained therein. Preferably, the roving forming element is a spindle. According to the invention, in the vortex chamber of the twisting means, at least in part (i.e., at least a part of the fibers), the fiber structure is given a real twist (rotation) by means of an air flow.

The roving machine not according to the invention for producing a roving from a fiber structure can also have another embodiment of a swirl-distributing means: Another swirl-distribution means, likewise not according to the invention, has a swirl chamber without roving-forming element (eg spindle). However, this vortex chamber has means which cause an air flow in the vortex chamber. This air flow gives the fiber structure at least partially (ie at least part of the fibers) a real twist (rotation). This second embodiment of a twist distribution means according to the invention can also have a plurality of vortex chambers with correspondingly a plurality of means for forming an air flow (see, for example, US Pat Fig. 3b ).

The drafting machines according to the invention or the twisting distribution means according to the invention can each be preceded by a drafting arrangement.

Preferably, the swirl-distributing agents according to the invention each have one or more swirl-accumulation elements. These twist dam elements can be designed, for example, as an edge, as a pin, as a twisted surface, as a cone or as a plurality of steering means. The twist distribution means according to the invention may also comprise a combination of the just-mentioned twist-jam elements, eg a twisted surface with a pin, or a cone with a pin, or an edge with a pin, or a twisted one Surface with a pin. The twist distribution means according to the invention may comprise a plurality of these twist dam elements or a combination thereof.

Preferably, the swirl-distributing means according to the invention have a plurality of nozzles for generating the air flow, wherein the nozzles are oriented so that their exiting air jets are rectified so as to produce together a rectified air flow. This is especially true when multiple vortex chambers are present, ie the air or vortex air flows have the same rotational or flow directions. Preferably, the nozzle bores are therefore arranged rotationally symmetrical about the axes of the vortex chambers or, in the case that a plurality of vortex chambers are present, arranged both rotationally symmetric and rotationally symmetric-offset on an axis (the inlet angle of the nozzle bores are therefore the same).
If a plurality of vortex chambers are present, then the nozzles can preferably be arranged such that the nozzles of a respective vortex chamber are arranged rotationally symmetrically, but each vortex chamber has a different entry angle for the respective nozzles. Although the air jets emerging in the respective vortex chambers remain rectified - in the sense of a left or a right turn - but have different "pitch angle". Even if the vortex air flow occurring in different vortex chambers has different "pitch angles", the twists nevertheless remain rectified, ie the fiber strand or roving undergoes a left or right turn in all vortex chambers. A rotationally symmetrical arrangement of the nozzles is for example in the FIG. 2 shown. A rotationally symmetrical offset arrangement of the nozzles is in the FIG. 3b to see (the nozzle holes 11 of the two vortex chambers are analogous to FIG. 2 also arranged rotationally symmetrical).

Preferably, the roving and twisting means according to the invention comprise a means, in particular a funnel or an aerodynamic or mechanical condenser, which has the function of determining the width of the fiber structure prior to entry into the twisting means.

Preferably, the distance between the inlet mouth of the roving-forming element (eg spindle) and the last nip line (eg of the outlet roller pair) is not greater than the longest fiber length contained in the fiber structure or greater than the average staple fiber length of the fiber structure.

Preferably, the distance between the entrance of the swirl-distribution means and the last nip line (eg of the outlet roller pair of a drafting system) is not greater than the longest fiber length contained in the fiber structure.

Preferably, the roving machine according to the invention is associated with a winding device. This winds the roving emerging on the swirling agent. Preferably, the winding device is a cross winder, a precision cross winder, a wild cross winder, a step precision winder, or a parallel winder.

Preferably, the yarn formation element is a spindle.

The invention also includes the inventive use of a twisting agent which operates by any air spinning method and which serves to produce a roving, the twisting means having only a swirl chamber with a roving element (e.g. at least partially (ie, at least a portion of the fibers) is given a true spin (spin) by means of an air or fluidized air flow.

In the use of a swirling agent according to the invention, a rectified air flow in the sense of the preceding embodiments is preferably generated in the swirling means (ie all air flows in the swirling means are either left-handed or right-handed turning to produce a corresponding left-hand or right-handed rotation).

In the use of a swirling agent according to the invention, the swirl-distributing means preferably has one, two, three, four, five, six or more nozzles for generating the air flow. Preferably, these nozzles are arranged rotationally symmetrical or rotationally symmetrical-offset (see the comments above and compare with the Figures 2 and 3b ).

Preferably, a swirl-distributing means useful for the inventive use comprises a plurality of nozzles for generating an air flow, which are aligned so that the exiting air jets are rectified and together generate a rectified air flow (according to the above versions, left or right-rotating air flows). Thus, the exiting air jets are rectified in a vortex chamber, these are preferably arranged rotationally symmetrical about the axis, or about an axis in, the vortex chamber.

In the above-discussed inventive roving, in particular flyer or in the inventive use of a swirling agent is the Roving issued only one protective rotation. Ie. the roving produced by the air flow is delayable. The twist (rotation) could for the further processing of the roving, z. B. to a ring yarn, are removed again.

All described roving spinning machines according to the invention, the swirl-distributing means thereof as well as all described uses of swirl-distributing means according to the invention do not work according to a false-wire method.

Legend:

1

Spinning station of a roving machine

2

drafting system

3

fiber structure

4

Swirl imparting means

5

swirl chamber

6

Roving element (spindle)

7

wind-up

8th

Off rollers

9

roving

10

Fiber guide element

11

Nozzle holes or nozzles

12

free fiber ends

13

inlet mouth

14

core

15

Twisting agent without roving element

16, 16.1, 16.2

airflow

17

Twisting agent with two vortex chambers

18

Twisting agent with twist dam element

19

Pin code

20

airflow

21

twisted fiber guide element with pin

22

twisted fiber guide element without pin

23

Fiber guiding element with several steering means

24

Twist stop cone

25

Fiber guide element

26, 27, 28

Steering with twist stop function

29

funnel

30

Pair of delivery rollers

31

Swirl imparting means

32

airflow

33

edge

34

clamping line

Claims (12)

1. Slubbing machine for the manufacture of a roving yarn (9) from a fibre assembly (3), containing one or more spinning positions (1) having each a twist application means (4) and preferably a drafting device (2) arranged upstream of the twist application means (4), characterised in that the twist application means (4) contains a swirl chamber (5) with a roving yarn formation element (6) contained within it, whereby the fibre assembly (3) is subjected in the swirl chamber (5) to a true twist, or at least in part to a true twist, by means of an air flow (32).
2. Slubbing machine for the manufacture of a roving yarn (9) according to claim 1, characterised in that the twist application means (4, 18) exhibits at least one twist stop element (19, 21, 22, 26, 27, 28, 33), preferably the twist stop element is designed as an edge (33), a pin (19), a toroidal surface (21, 22), a cone (24), as several deflecting means (26, 27, 28), or as a combination of these elements.
3. Slubbing machine for the manufacture of a roving yarn (9) according to claim 1 or 2, characterised In that the twist application means (4, 18, 17) exhibits several nozzles (11) for the production of the air flow (16, 16.1, 18.2, 30), whereby the nozzles (11) are arranged in such a way that the emerging air jets (32) lie in the same direction in such a way as to produce together an air flow (16.1, 16.2, 20) and a twist effect in the same direction, with the nozzles (11) arranged for preference rotationally symmetrically or rotationally-symmetrically offset.
4. Slubbing machine for the manufacture of a roving yarn (9) according to one of claims 1 to 3, characterised in that means (29) are provided, in particular funnels (29) or aerodynamic or mechanical condensers, which determine the width of the fibre assembly (3) before the inlet into the twist application means (4, 15, 17, 18, 31).
5. Slubbing machine for the manufacture of a roving yarn according to one of claims 1, 3, or 4, characterised In that the distance interval between the inlet aperture of the roving yarn formation element (13) and the last nip line (34) is not greater than the longest fibre length contained in the fibre assembly (3).
6. Slubbing machine according to one of the foregoing claims, characterised in that a winding device (7) is allocated to the spinning positions (1) of the slubbing machine, which winds up the roving yarn (9) emerging from the twist application means (4, 15, 17, 18, 31), with the winding device (7) for preference being a cross-winder, a precision cross-winder, a random cross-winder, a step cross-winder, or a parallel winder.
7. Slubbing machine according to one of the foregoing claims, characterised in that the roving yarn formation element (6) is a spindle.
8. Use of a twist application means (4, 18), which operates in accordance with an air-spinning process, for the manufacture of a roving yarn (9), characterised in that the twist application means (4, 18) exhibits a swirl chamber (5), with a roving yarn formation element (6) contained in it, whereby the fibre assembly (3) is subjected in the swirl chamber (5) at least partially to a true twist by means of an air flow (32).
9. Use of a twist application means (4, 15, 17, 18, 31) according to the claim 8, characterised in that the twist application means (4, 15, 17, 18, 31) generate together one airflow.
10. Use of a twist application means (4, 15, 17, 18, 31) according to one of Claims 8 or 9, characterised in that the twist application means (4, 15, 17, 18, 31) contains one, two, three, four, five, six or more nozzles (11) for the production of the air flow.
11. Use of a twist application means (4, 15, 17, 18, 31) according to one of Claims 8 to 10, characterised in that the twist application means (4, 15, 17, 18, 31) contains several nozzles (11) for the production of the air flow (16.1, 16.2, 16, 20), whereby the nozzles (11) are aligned in such a way that the emerging air jets (32) lie in the same direction in order to form together one air flow (16.1, 16.2, 16, 20) in the same direction.
12. Use of a twist application means according to one of claims 8 to 11, characterised that the twist applied to the roving yarn (9) is a protective twist, as a result of which the roving yarn (9) remains capable of being drafted.

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