EP2084315B1 - Method and apparatus for crimping a multifilament thread - Google Patents

Description

The invention relates to a method for crimping a multifilament yarn according to the preamble of claim 1 and to an apparatus for carrying out the method according to the preamble of claim 8.

In the production of crimped synthetic threads, it is known to first extrude a plurality of rope-shaped filaments from a thermoplastic melt. The filament bundle is consolidated after cooling and thus forms a smooth multifilament thread. In order to produce a crimp in the individual filament strands, the multifilament thread is puffed up to form a thread plug. For this purpose, the filaments of the thread are preferably conveyed by a hot fluid and deformed on the surface of the yarn plug to loops and bows. To fix the crimping forming in the filaments, the yarn plug is thermally treated. In the event that the thread plug formation already takes place by means of a hot fluid, the thus heated yarn plug is then cooled. For this purpose, the yarn plug is guided on the circumference of a treatment drum. The treatment drum is rotationally driven, so that the residence time for cooling the yarn plug is determined essentially by the peripheral speed of the treatment drum on the one hand and on the other hand by the degree of wrap of the yarn plug on the circumference of the treatment drum. Since the peripheral speed of the treatment drum is determined by process speeds and can only be changed to a limited extent, intensive cooling can only be achieved by appropriate wraps of the yarn stopper on the treatment drum.

So is out of the DE 38 00 773 C2 a method and a device are known in which the yarn plug is guided in several wraps around the circumference of the treatment drum. Here, the wraps of the yarn plug are guided directly adjacent to each other on the circumference of the treatment drum, so that mutual influences of the individual filaments of the yarn plug are essential. Particularly in the case of yarn plugs having a correspondingly low yarn plug density, a loose composite of the filaments within the yarn plug leads to individual filaments catching each other in the adjacent wraps of the yarn plug on the circumference of the treatment drum. Such entanglements have a negative effect, in particular when the thread stopper is broken up into a crimped thread, so that irregularities occur on the crimped thread which are particularly noticeable in a fluctuating thread tension when the crimped thread is pulled off. Such thread tension fluctuations have a very negative effect, in particular in the after-treatment of the thread, for example by turbulence.

It is therefore an object of the invention to provide a method and apparatus for crimping a multifilament yarn of the generic type such that after a thermal treatment of the yarn plug with several adjacent wraps on the circumference of a treatment drum safe and uniform resolution of the yarn plug to a crimped yarn possible becomes.

The object is achieved in that the thread is guided obliquely from the resolution of the yarn plug, which sets with increasing wrap of the thread on the circumference of the treatment drum, a growing axial distance between the thread and the yarn plug on the circumference of the treatment drum.

Advantageous developments of the invention are defined by the respective features and feature combinations of the subclaims.

Surprisingly, it has been found that even with a non-linear transition of the yarn plug to the crimped yarn, the individual filament strands have no significant differences in their nature and crimp. Due to the oblique withdrawal of the crimped thread from the end of the thread plug, however, it was possible to ensure that even the filament strands entangled with the adjacent loop of the thread plug were inserted into the filament composite of the crimped thread after release without irregularities. By facing away from the wraps of the yarn plug on the treatment drum course of the crimped yarn is formed in the resolution range between an inner side of the yarn plug, which is directly adjacent to the adjacent loop of the yarn plug, and an outer side of the yarn plug different force effects for forming the yarn. Thus, in particular, the sub-region of the filament strands placed in the inner region of the yarn plug are drawn more intensively in relation to the subregions set in the outer region, which considerably facilitates the triggering of possible individual overlapping points between the individual wraps of the yarn plug on the circumference of the treatment drum. In that regard, the yarn plug can be evenly transferred into the crimped yarn.

In order to obtain the most stable and uniform conditions in the management of the thread and the resolution of the yarn plug, in particular the development of the invention has proven, in which the thread is guided after the dissolution of the yarn plug in a take-off groove on the circumference of the treatment drum. This makes it possible to achieve reproducible and uniform operating states and yarn paths on the circumference of the treatment drum.

Depending on the density of the yarn plug, which is directly related to the mutual influence of the yarn plug wraps on the circumference of Treatment drum affects different thread patterns can be selected when dissolving the yarn plug. However, it has been found that the thread should be guided as possible with a pitch angle at the periphery of the treatment drum, which exceeds an angle of 10 °. Depending on the looseness of the yarn plug, the pitch angle can be increased, with maximum pitch angles in the range of 80 ° should not be exceeded.

For the aftertreatment of the crimped yarn, it is particularly important that a sufficient yarn tension is produced on the yarn. For this purpose, it is proposed according to an advantageous development of the invention that the thread between the resolution area and a drain area is guided over a wrap around the circumference of the treatment drum, which includes at least a circumferential angle of 45 °. On the one hand, this makes it possible to realize only the thread tension forces which are only minimal for the yarn thread break-up compared to the thread tension forces required for the aftertreatment. Thus, for example, no significant tensile force acting on the thread is desired in the area of dissolution of the yarn plug. For example, the yarn tension required for the aftertreatment of the crimped yarn could be at a value of 100 cN.

For the aftertreatment has proven particularly useful when the crimped yarn is vortexed before winding to a coil and after the treatment of the treatment drum by means of a swirling device. Thus, the cohesion of the crimped filaments in the yarn composite for further processing can be improved advantageously.

In order to carry out the formation of the yarn plug as well as the thermal treatment of the yarn plug as possible with high flexibility, the process variant has proven particularly useful in which the yarn plug is supported for storage on the periphery of the treatment drum by a conveyor, wherein the conveyor and the treatment drum independently driven become. The density and guiding speed of the yarn plug can thus be adjusted on the one hand by the conveying means and on the other by the treatment drum.

To carry out the method according to the invention, a device according to the features of claim 8 is proposed. The underlying object is achieved thereby according to the invention that means for guiding the crimped yarn are provided obliquely from the resolution of the yarn plug on the circumference of the treatment drum, the increasing axial distance between the thread and the. With increasing wrapping of the thread on the circumference of the treatment drum Sets the thread stopper on the circumference of the treatment drum.

Such agents can be formed directly on the circumference of the treatment drum. However, it is also possible to form the means at a distance from the circumference of the treatment drum.

To be particularly advantageous has been found to form the agent through a withdrawal groove on the circumference of the treatment drum. The pull-off groove is arranged axially offset from the guideway receiving the thread stopper on the circumference of the treatment drum, so that a curled thread led obliquely out of the release area of the yarn plug can be introduced directly into the pull-off groove. This results in very stable and reproducible operating conditions and thread guides on the circumference of the treatment drum in the resolution of the yarn plug.

For the yarn guide of the crimped yarn on the circumference of the treatment drum in this case, in particular the formation of the device according to the invention has proven to be advantageous in which a diameter step is formed on the circumference of the treatment drum between the take-off and the guideway. Here, the thread over the diameter step on the circumference of the treatment drum guided. It can thus realize pitch angles in the threadline, which are possible in the range between 10 ° and 80 °.

In order to be able to guide the crimped thread in the pull-off groove with defined looping, the treatment drum is preferably arranged downstream of a thread guide which tensions a guide plane with the pull-off groove. Here, depending on the position of the yarn guide a wrap of the crimped yarn in the take-off groove can be realized, which preferably includes at least a circumferential angle of 45 ° at the periphery of the treatment drum.

Since texturing means with stuffer boxes are usually used for forming yarn stoppers, which are aligned vertically, the development of the device according to the invention is preferably used, in which between the texturing agent and the treatment drum, a supply means is arranged to ensure the smoothest possible transition of the yarn plug of the Texturing to the scope of the treatment drum to receive. Thus, the preset in the stuffer box yarn thread densities can be maintained substantially unchanged. The transition to the circumference of the treatment drums is preferably acute-angled to tangential, so that the yarn plug can be guided without substantial supply.

The supply means is preferably formed by a guide means and a conveying means which are combined to form a conveying gap, which is conveyed to the yarn plug by a one-sided engagement of the conveying means along a slide formed by the guide means. This can advantageously combine low-deformation feed and a promotion of the yarn plug. By means of the conveying means, a defined and controllable outlet speed of the thread stopper from the texturing means is possible, so that a constant yarn stopper construction is ensured.

In order to realize a repeated looping of the yarn plug at a substantially stretched and straight storage of the yarn plug on the circumference of the treatment drum, a guide in the direction of rotation of the treatment drum is preferably arranged a short distance in front of the guide means, so that the yarn plug after a single wrap around the circumference of the treatment drum can be moved by the conducting means. This makes it possible to realize compact guides of the yarn plug on the guide track in the treatment drum.

For thermal treatment, the cooling of the yarn plug on the circumference of the treatment drum is preferably carried out by an ambient air. For this purpose, the circumference of the treatment drum is formed by a gas-permeable guide casing, wherein in the interior of the treatment drum, a negative pressure acting with respect to the environment is generated by a suction device. Thus, a uniform flow of cooling air to flow through the yarn plug on the circumference of the treatment drum can be generated. Alternatively or additionally, conditioning of the air or the thread plug can be carried out. Thus it is possible to use a cold air or the thread plug with a fluid, e.g. To wet water.

The device according to the invention is preferably used in a spinning process in which the crimped yarn is wound up into a coil at the end of the spinning process. It is particularly advantageous if, before winding an additional turbulence of the crimped filaments is performed. For this purpose, the treatment drum downstream of a turbulizer through which the filaments of the multifilament crimped yarn are vortexed after crimping. Within the spinning process, multifilament yarns or composite yarns, for example BCF yarns, can be produced. In composite threads, for example a so-called tricolor thread, which is formed from three individual partial threads, the thread plug can be produced by bringing together all three partial threads.

Regardless of the nature of the synthetic thread, a delivery nozzle combined with a compression chamber has proven to be particularly suitable as texturing agent. The delivery nozzle is connected to a compressed air source, wherein the compressed air is preferably fed heated to the delivery nozzle, so that in addition to the promotion of the filaments heating of the filaments can take place simultaneously.

The invention will be described in more detail below with reference to some embodiments of the device according to the invention for carrying out the method according to the invention with reference to the accompanying figures.

Fig. 1

schematisch eine Querschnittsansicht eines ersten Ausführungsbeispiels der erfindungsgemäßen Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens

Fig. 2

schematisch eine Seitenansicht des Ausführungsbeispiels der erfindungsgemäßen Vorrichtung aus Fig. 1

Fig. 3

schematisch eine Rückansicht des Ausführungsbeispiels der erfindungsgemäßen Vorrichtung aus Fig. 1

Fig. 4

schematisch eine Seitenansicht eines weiteren Ausführungsbeispiels der erfindungsgemäßen Vorrichtung

They show:

Fig. 1

schematically a cross-sectional view of a first embodiment of the device according to the invention for carrying out the method according to the invention

Fig. 2

schematically a side view of the embodiment of the device according to the invention Fig. 1

Fig. 3

schematically a rear view of the embodiment of the device according to the invention Fig. 1

Fig. 4

schematically a side view of another embodiment of the device according to the invention

In Fig. 1 . Fig. 2 and Fig. 3 a first embodiment of the inventive device for carrying out the method according to the invention for crimping a multifilament yarn in several views is shown schematically. In Fig. 1 the device is schematically in a cross-sectional view and in Fig. 2 shown in a side view. The Fig. 3 shows the rear view of the embodiment. Unless an explicit reference is made to one of the figures, the following description applies to both figures.

The device, which could be integrated, for example, in a spinning process for the production of a BCF yarn, has a texturing agent 1 for upsetting a running multifilament yarn 8 into a yarn plug 9. The thread 8 could be formed depending on the percentage of a filament bundle or a plurality of filament bundles a plurality of sub-threads. The texturing agent 1 is formed in this embodiment by a delivery nozzle 2 and an adjacent stuffer box 4, as for example from the WO 03/004743 is known. In that regard, reference is expressly made to the cited document at this point, so that at this point a brief description is sufficient.

The delivery nozzle 2 has a middle thread channel 6, in which a delivery fluid is introduced. For this purpose, the delivery nozzle 2 is connected via a fluid connection 3 with a compressed air source. The introduced into the thread channel 6 conveying fluid, which is preferably formed by a compressed air is heated prior to introduction into the delivery nozzle 2. By entering under pressure compressed air into the thread channel 6 of the multifilament 8, which was previously formed from a plurality of extruded filaments, sucked into the delivery nozzle 2 and conveyed along the thread channel 6.

The stuffer box 4 has an extension of the thread channel 6 to a stopper channel 7, which is formed by a plurality of annularly arranged blades 5. The lamellae 5 are held in a housing of the stuffer box 4, wherein the conveying fluid emerging from the stoppage channel 7 is discharged via a fluid outlet. Within the plug channel 7, each of the synthetic filaments of the thread 8 is deposited by means of the conveying fluid at the surface of the yarn plug 9 into loops and bows. In this case, the yarn plug 9 moves continuously from the plug channel 7 in the direction of a plug outlet.

On the outlet side of the texturing 1 a supply means 15 is provided for further guidance of the yarn plug. The feeding means 15 is in this Embodiment formed by a directly on the stuffer box 4 arranged guide means 11 and a conveyor 13, which are arranged opposite to a conveying gap 19. As a result, a holding force can be generated on the yarn plug 9, which counteracts the pressure of the conveying fluid for depositing the yarn 8 and for forming the yarn plug 9. This allows on the one hand to achieve a uniform yarn plug formation within the stuffer box 4 and on the other hand a uniform promotion of the yarn plug 9. The conveying means 13 is formed as a conveying roller 14 through which the yarn plug 9 is conveyed with a one-sided engagement of the conveying roller 14. The guide means 11 has for this purpose a slide 12, on which the yarn plug 9 is guided in a sliding manner. The conveying gap 19 formed between the guide means 11 and the conveying means 13 is designed such that the thread stopper 9 receives a change in shape, so that the forces required to convey and build up a retaining force can be generated on the thread stopper 9. For this purpose, the guide means 11 is preferably designed as a guide rail 20 which extends in an L-shaped manner between the texturing means 1 and a treatment drum 26. The free end of the guide rail 20 forms a stopper outlet 10, which is assigned directly to the circumference of the treatment drum 20. The slide 12 in the guide rail 20 is arc-shaped, wherein in the arcuate portion of the slide 12 of the conveying gap 19 is formed by the opposite conveyor roller 14. The conveyor roller 14 is coupled to a motor 18 via a drive shaft 17.

The deflection of the yarn plug 9 from the outlet side of the texturing agent 1 to the stopper outlet 10 is matched to the circumference of the treatment drum 26 such that the yarn plug 9 can be fed to the treatment drum 26 substantially tangentially.

For thermal treatment of the yarn plug 9 is placed on the circumference of the treatment drum 26 in a straight line. The circumference of the treatment drum 26 is designed for this purpose as a gas-permeable guide casing 27. The treatment drum 26 is rotatably driven by a drum drive 28. The peripheral speed of the treatment drum 26 and the conveying speed of the yarn plug 9 conveyed by the conveyor 13 are substantially the same, so that the yarn plug 9 runs without further changes in density on the circumference of the treatment drum 26 and is continued. However, it is also possible, via the drum drive 28, to set a peripheral speed which is slightly increased with respect to the conveying speed of the conveyor 13. Thus, a slight loosening of the yarn plug when casserole on the treatment drum 26 is achieved. An increase in the peripheral speed of the treatment drum of 5% to 40% relative to the conveying speed of the conveyor has proven to be particularly advantageous.

The treatment drum 26 is closed at the end faces and connected via a suction port 29 with a suction device 30. Via the suction device 30, a negative pressure is generated in the interior of the treatment drum 26, so that gaseous fluid is sucked from outside via the guide casing 27 into the interior of the treatment drum 26. To treat the yarn plug 9, this is deposited on the guide casing 27 of the treatment drum 26 and guided on the circumference of the treatment drum 26.

The treatment drum 26 has on the guide casing 27 for this purpose a guideway 24. The yarn plug 9 is guided in several directly adjacent wraps. The guide means 11 has, at the end facing the treatment drum 26, a guide means 23 which is located on the side of the guide rail 20 opposite the slide track 12. The guide means 23, which is preferably formed as a sliding edge, has a substantially congruent to the guide casing 27 of the treatment drum 26 adapted shape and is held at a short distance above the treatment drum 26. In this case, the sliding edge runs obliquely to the circumference of the treatment drum 26 in such a way that a thread stopper which has emerged via the slide track 12 at the stopper outlet 10 and is deposited on the circumference of the treatment drum 26 after a straight run on the guide track 24 of the guide casing 27 is automatically guided against the sliding edge of the lubricant 23 and is displaced on the guide track 24.

As in Fig. 3 is shown, the thread stopper 9 is axially displaced by the lubricant 23 on the circumference of the treatment drum 26. Thus, it is possible to guide the yarn plug 9 with several wraps in the guide track 24 of the guide casing 27, wherein the wraps of the yarn plug are guided directly next to each other. In that regard, the guide means 11 can be used both for guiding the yarn plug 9 in front of the treatment drum 26 and for guiding the yarn plug 9 on the treatment drum 26.

The guide casing 27 of the treatment drum 26 has, in addition to the guide track 24, a pull-off groove 22. The withdrawal groove 22 and the guide track 24 are separated from each other at the periphery of the treatment drum 26 by a diameter step 34. In this case, the groove bottom of the pull-off groove 22 is located on a slightly smaller diameter relative to the diameter of the guide track 24. The pull-off groove 22 and the guide track 24 are gas-permeable to the guide sheath 27, so that the guide track 24 and the take-off groove 22 are flowed through from outside to inside. Depending on the thread guide, a guide zone can be formed between the pull-off groove 22 and the guide track 24. The guide zone could be both gas-permeable or non-permeable to gas to guide the thread.

For guiding a yarn guided on the circumference of the pull-off groove 22, the treatment drum 26 is followed by a yarn guide 31. The yarn guide 31, which is formed in this case by a deflection roller, biases a guide plane of the crimped yarn 35 with the withdrawal groove 22 on the circumference of the treatment drum 26.

In the management level, the yarn guide 31 is followed by a take-off means 16 with several godet units 32.1 and 32.2. Between the godet units 32.1 and 32.2, a swirling device 33 is provided, which is connected to a compressed air source, not shown here. The godet units 32.1 and 32. 2 are each formed by a driven galette and a non-driven auxiliary role.

At the in Fig. 1 . 2 and 3 In the embodiment shown, the multifilament yarn 8, which has been drawn off and drawn, for example, directly from a spinning zone, is fed to the texturing agent 1. The thread 8 formed from a multiplicity of extruded filament strands is conveyed through the delivery nozzle 6 by means of a hot fluid in the thread channel 6 and guided into the adjacent stuffer box 4. Within the stuffer box, a thread plug 9 is formed in the plug channel 7, with the filaments of the thread 8 laying down in loops and sheets on the surface of the thread plug 9. The thread plug 9 is then guided out of the texturing means 1 via the feed means 15 with a gentle deflection to the circumference of the treatment drum 26. For this purpose, a conveyor 13 engages on one side of the yarn plug 9, and promotes the yarn plug 9 continuously along the slide 12 formed in the guide means 11. The yarn plug 9 occurs at a uniform guide speed continuously out of the plug outlet 10 and is taken over by the rotating treatment drum 26 , The peripheral speed of the treatment drum 26 and the outlet speed of the yarn plug are in this case substantially identical, so that no loosening of the yarn plug 9 occurs. The yarn plug 9 is guided in several wraps on the guide track 24 of the guide casing 27. In this case, the wraps of the yarn plug 9 are adjacent to each other, so that touch the individual yarn plug wraps on the circumference of the treatment drum 26.

Like from the Fig. 2 shows, the yarn plug 9 is guided on the guide track 24 of the guide casing 27 with two wraps. After two wraps of the yarn plug 9, a dissolution region 25 adjoins the circumference of the treatment drum 26, in which the yarn plug 9 is dissolved into a crimped yarn 35. To dissolve the yarn plug 9 to the crimped yarn 35 in the resolution region 25 of the thread 35 is guided obliquely out of the resolution of the yarn plug. Here, between an imaginary circumference, which corresponds to the course of the last looping of the yarn plug 9 on the circumference of the treatment drum 26, and the thread 35, a pitch angle, the in Fig. 2 marked with the Greek letter α. The pitch angle α is selected such that, as the loop 35 of thread 35 progresses around the circumference of the treatment drum 26, a constantly increasing axial distance between the thread plug 9 and the crimped thread 35 is established. The pitch angle α for guiding the thread 35 may in this case be formed in the range of 10 ° to 80 °. Depending on the density and guidance of the thread plug 9 in the guide casing 27, the pitch angle of the thread can be selected.

To guide the thread 35 is inserted from the guideway 24 in the withdrawal groove 22. In this case, the diameter step 34 formed between the guideway 24 and the pull-off groove 22 represents a deflection of the thread 35 on the circumference of the treatment drum 26, so that a stable thread guide with uniform pitch angle remains ensured from the resolution area. Within the pull-off groove 22, the thread 35 is guided with a substantially straight thread run in the groove bottom, until in an in Fig. 3 marked drainage region 36 of the thread dissolves from the circumference of the treatment drum 26. In this case, the drainage region 36 and the dissolution region 25 are preferably held relative to one another in such a way that a wrap-around region for the yarn 35, which includes at least a circumferential angle of> 45 °, adjusts to the treatment drum 26. Thus, a yarn tension required for the further treatment of the crimped yarn 35 can be sufficiently generated.

For further treatment, the crimped thread 35 is swirled in the swirling device 33 by means of a compressed air flow. This achieves intensive intertwining of the crimped filaments, which in particular improves the cohesion of the thread.

In Fig. 4 is a further embodiment of the device according to the invention for carrying out the method according to the invention shown schematically in a side view. The embodiment according to Fig. 4 is substantially identical in structure and function to the previous embodiment, so that only the differences will be explained at this point and otherwise reference is made to the preceding description.

The embodiment according to Fig. 4 has as feeding means 15 a pipe socket 37 which is associated with the texturing means (not shown here) directly with one end. The supply means 15 is arranged above the treatment drum 26, wherein a plug outlet 10 opens directly on the circumference of the treatment drum 26.

The treatment drum 26 has on the guide casing 27 on a guideway 24 which is gas-permeable. The guide casing 27 is rotatably driven via the drum drive 28. The guideway 24 on the circumference of the treatment drum 26 has in the guide casing 27 a first region for guiding the yarn plug 9 and an axially offset second region for guiding a crimped yarn 35. In the yarn guide region of the guide track 24, a thread guide element 21 is assigned to the circumference of the treatment drum 26. The thread guide element 21 is arranged in the region of the second section of the guide track 24 axially offset from a resolution region 25 on the circumference of the treatment drum 26. The thread guide element 21, which is formed in this embodiment, for example, as a loop-shaped thread guide, a not shown here deduction means downstream.

At the in Fig. 4 illustrated embodiment of the device according to the invention, the yarn plug 9 is guided after storage on the circumference of the treatment drum with two wraps. To dissolve the yarn plug 9, the crimped yarn 35 is pulled off the circumference of the treatment drum 26 via the yarn guide element 21. For this purpose, on the guideway 24, a helical thread run, which causes a formed between the yarn plug 9 and the thread 35 axial distance on the circumference of the treatment drum 26 with increasing looping of the thread 35 on the guide casing 27 increases continuously. As a result, an oblique drainage of the thread 35 from the dissolution area 25 is achieved. The thread 35 is thus guided helically with the pitch angle α on the circumference of the treatment drum 26.

For thermal treatment, a tempered gaseous fluid is sucked from the outside through the gas-permeable guide casing 27 and discharged inside the treatment drum 26. In this case, the gas-permeable region of the guide jacket 27 extends over the entire guide track region 24, so that the thread 35 is held under suction on the circumference of the treatment drum 26.

For cooling an already tempered yarn plug 9, the ambient air is preferably used to cool the guided in several wraps yarn plug on the circumference of the treatment drum 26. Basically, however, it is also possible by means of additional fluid sources to suck in a discharged in the vicinity of the treatment drum 26 fluid, for example, to heat the yarn plug and dissipate. Thus, advantageously, a plurality of treatment zones can be formed on the treatment drum 26, so that the yarn plug can be treated in a plurality of wraps in a plurality of stages.

In the in the Fig. 1 to 4 illustrated embodiments, a treatment drum is shown in each case, on which a yarn plug is guided in several wraps. In principle, however, it is also possible to run several yarn plugs parallel to one another on a treatment drum. The invention also advantageously extends to such devices. It is essential here that the crimped thread is guided at a pitch angle on the circumference of the treatment drum, which leads to an increase in the axial distance between the thread and the yarn plug.

LIST OF REFERENCE NUMBERS

1

texturing

2

feed nozzle

3

fluid port

4

stuffer

5

slats

6

thread channel

7

plug channel

8th

thread

9

yarn plug

10

plug outlet

11

guide means

12

slipway

13

funding

14

conveyor roller

15

feeding

16

withdrawal means

17

drive shaft

18

engine

19

conveying gap

20

guide rail

21

Thread guiding element

22

Abzugsnut

23

guide means

24

guideway

25

resolution range

26

treatment drum

27

guide sheath

28

drum drive

29

suction

30

suction

31

thread guides

32.1, 32.2

galette

33

swirling

34

Diameter step

35

curled thread

36

drainage area

37

pipe socket

Claims (19)

1. A method for crimping a multifilament thread, wherein the thread which is produced by melt spinning is compressed to a thread plug, wherein the thread plug is cast on the circumference of a rotating processing drum for thermal treatment and is wrapped around the circumference of the processing drum with multiple side-by-side wraparounds, wherein the thread plug is unraveled in an unraveling area on the circumference of the processing drum into the crimped thread which is wrapped around and pulled off the processing drum,
   characterized in that
   the crimped thread is guided at a slant from the unraveling area of the thread plug such that a growing axial distance appears between the crimped thread and the thread plug on the circumference of the processing drum.
2. The method according to claim 1,
   characterized in that
   the thread is guided into a cast-off groove on the circumference of the processing drum after unraveling of the thread plug.
3. The method according to claims 1 or 2,
   characterized in that
   the thread is guided out from the unraveling area at a gradient angle at the circumference of the processing drum such that an angle of > 10° is created between the straight grain and a circumferential line of the processing drum.
4. The method according to one of the claims 1 or 3,
   characterized in that
   the thread is guided on the circumference of the processing drum between the unraveling area and a cast-off area via a wraparound area, which includes at least one circumferential angle of 45°.
5. The method according to one of the claims 1 to 4,
   characterized in that
   the crimped thread is twirled by means of a twirling device after cast-off from the processing drum.
6. The method according to one of the claims 1 to 5,
   characterized in that
   the thread plug is conveyed by means of a conveyor means for casting on the circumference of the processing drum, wherein the conveyor means and the processing drum are driven independently of each other.
7. The method according to one of the claims 1 to 6,
   characterized in that
   the thread plug having a substantially straight plug course is cast on the circumference of the processing drum, wherein the thread plug is axially displaced on the circumference of the processing drum for the transition from a first wraparound to a directly adjacent second wraparound.
8. A device for carrying out the method according to one of the claims 1 to 7, having a texturing means (11) for forming a thread plug (9) made up of at least one multifilament thread (8) produced by means of melt spinning, having a rotationally driven processing drum (26) for the thermal treatment of the thread plug (9), and having a cast-off means (16) for casting the crimped thread (35) from the circumference of the processing drum (26), wherein the thread plug (9) is guided at the circumference of the processing drum (26) with multiple wraparounds, and wherein the thread plug (9) can be unraveled in an unraveling area (25) on the circumference of the processing drum (26) into the crimped thread (35),
   characterized in that
   a means (22, 34, 21) is provided for guiding the crimped thread (35) at the circumference of the processing drum (26) at a slant from the unraveling area (25) of the thread plug (9), that with an increase of wraparounds of the thread (35) at the circumference of the processing drum (26) an increased axial distance is formed between the thread (35) and the thread plug (9) at the circumference of the processing drum am (26).
9. The device according to claim 8,
   characterized in that
   the means is formed by a thread element (21) that is arranged at a distance to the processing drum (26), which is associated with the circumference of the processing drum (26) at an axial offset to the guideway (24) receiving the thread plug (9).
10. The device according to claim 8,
    characterized in that
    the means is formed by a cast-off groove (22) at the circumference of the processing drum (26), wherein the cast-off groove is arranged on the circumference of the processing drum at an axial offset to a guideway receiving the thread plug.
11. The device according to claim 9,
    characterized in that
    a diameter step (34) is embodied on the circumference of the processing drum (26) between the cast-off groove (22) and the guideway (24), by means of which the thread (35) is guided at a slant on the circumference of the processing drum (26) such that an angle of > 10° is created between the straight grain and a circumferential line of the processing drum.
12. The device according to claims 10 or 11,
    characterized in that
    a thread guide (31) is associated with the processing drum (26), which tensions a guide plane with the cast-off groove and creates a wraparound area of the crimped thread (35), which includes at least one circumferential angle of 45° at the circumference of the processing drum (26).
13. The device according to one of the claims 8 to 12,
    characterized in that
    a supply means (15) is arranged between the texturing means (1) and the processing drum (26) and that the supply means (15) is associated with a plug outlet (10) of the guideway (24) at the circumference of the processing drum (26).
14. The device according to claim 13,
    characterized in that
    the supply means (15) is formed by a guide means (1) and a conveyor means (13), which are combined into a conveyor gap (19) such that the thread plug (9) is guided by means of an engagement of the conveyor means (13) on one side along the slideway (12) formed by the guide means (11).
15. The device according to claim 14,
    characterized in that
    the conveyor means (13) is formed by a driven conveyor roller (14), which abuts the thread plug with a rotating conveyor casing and that the guide means (11) is formed by a guide rail (20), the one-sided slideway (12) of which is arranged opposite of the conveyor roller (14) for forming the conveyor gap (19).
16. The device according to claims 14 or 15,
    characterized in that
    a control means (23) is arranged in the rotating direction of the processing drum (26) at a short distance in front of the guide means (11).
17. The device according to one of the claims 8 to 16,
    characterized in that
    the circumference of the processing drum (26) is formed by a gas permeable guide casing (27), which is connected to a suction device (30), by means of which low pressure acting upon the environment can be created in the interior of the processing drum (26).
18. The device according to one of the claims 8 to 17,
    characterized in that
    a twirling device (33) is connected downstream of the processing drum (26), by means of which the filaments of the multifilament thread (35) can be twirled after crimping.
19. The device according to one of the claims 8 to 18,
    characterized in that
    the texturing means (1) is formed by a conveyor nozzle (2) and a compression chamber (4) associated with the conveyor nozzle (2) on an outlet side, wherein the conveyor nozzle (2) is connected to a compressed air source.

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