EP3631060B1 - Method and melting spinning device for preparing a crimped multicolored composite yarn - Google Patents

Description

The invention relates to a method for producing a crimped multicolored composite thread in a melt-spinning process from a plurality of extruded partial threads and to a melt-spinning device for carrying out the method.

In the production of multicolored carpet yarns, several differently colored threads are usually produced in a melt spinning process and combined to form a composite thread. A generic method and a generic melt-spinning device for the production of such multicolored carpet yarns are, for example, from WO 2006/081844 known.

In the known method and the known melt-spinning device, the partial threads are swirled several times before they are crimped. A so-called pre-interlacing takes place before the partial threads are stretched. After the stretching and before the crimping, post-interlacing takes place, with the post-interlacing nozzles being controllable separately from one another for the separate interlacing of the filaments. In this way, different color effects can be realized in the composite thread, which leads to a mixed color or a multicolor on the composite thread.

In order to meet the rapidly changing fashion trends and thus the constantly changing demands on carpet yarns, in practice there is a desire to be able to produce such composite threads in a melt-spinning process with high flexibility. Here are also possible to realize uniform physical properties on the partial threads, so that the composite thread has a high quality.

From the EP 0 861 931 A1 a method for producing a composite thread from several partial threads is known, in which the partial threads are swirled immediately before and after texturing. However, subsequent turbulence of the already textured partial threads has the fundamental disadvantage that, due to the textured structure of the individual filaments, only limited filament mixing is possible. In addition, the filaments are usually cooled with a cooling medium after texturing, so that the individual filaments of the filaments behave relatively rigidly and can therefore only be mixed by increased pressure in the after-intermingling.

Also from the U.S. 2002/032955 A1 a method for the production of carpet yarns is known.

It is therefore an object of the invention to further develop a generic method for producing a crimped multicolored composite thread from extruded partial threads and a generic melt-spinning device for carrying out the method in such a way that the composite thread can be produced from multiple colored partial threads with a flexible color spectrum that is as large as possible.

A further aim of the invention is to further develop the generic method and the generic melt-spinning device in such a way that a plurality of composite threads with different properties can be produced.

According to the invention, this object is achieved by a method having the features of claim 1 and by a melt-spinning device having the features of claim 8 .

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

The invention has the particular advantage that individual treatment of the partial threads is possible in each treatment stage, particularly during pre-interlacing, post-interlacing and crimping. In this case, the partial threads can be treated separately or together as a partial composite thread. In particular, the premature merging of several partial threads into a partial composite thread creates new, previously unknown color patterns, which are ultimately noticeable in the composite thread through high color separations. In the method according to the invention, the colored filament bundles are first extruded separately and, after cooling, combined to form a partial thread. This is followed immediately by pre-intermingling of the individual partial threads or of a partial composite thread formed from a plurality of partial threads. The partial threads and the partial composite thread are pre-interlaced independently of one another. After the pre-interlacing, the partial threads and the partial composite thread are stretched. In this way, the filament bond created by the pre-interlacing is partially eliminated. Subsequent separate twirling of the individual partial threads or the partial composite thread made up of several partial threads makes it possible to set special color mixtures, which are then crimped when the individual threads and the partial thread are textured separately and result in the desired color effects of the composite thread when brought together.

To carry out the method, the pre-intermingling nozzles and the post-intermingling nozzles and the texturing nozzles are designed in the melt-spinning device according to the invention in such a way that either a single partial thread or a partial composite thread formed from several partial threads can be treated. This allows a variety of yarn types without additional treatment units are produced with the melt spinning device according to the invention.

The flexibility for producing the multicolored composite thread can be further increased in that at least one process parameter for pre-interlacing the individual partial threads and/or the partial composite thread can be freely selected individually for each of the partial threads and/or the partial composite thread. It is thus possible to set the treatment air pressure as a process parameter for each of the partial threads or the partial composite thread. It is also possible to select a setting for the process parameter in which no turbulence occurs on the part thread in question.

In the case of the melt spinning device, a plurality of compressed air supply lines with separate compressed air adjusting means are assigned to the pre-intermingling nozzles of the pre-intermingling device, so that the pre-intermingling nozzles can be controlled independently of one another. It is thus possible to treat a partial thread, a partial composite thread or no thread at all in the pre-interlacing nozzles.

The post-interlacing nozzles of the post-interlacing device are also assigned several compressed air supply lines with separate compressed air adjusting means in such a way that the post-interlacing nozzles can be controlled independently of one another. In this way, different compressed air settings can also be implemented during the post-intermingling of the partial threads or partial composite threads.

In addition, the process variant offers a further possibility of producing special color effects on the composite thread, in which at least one process parameter for crimping the individual partial threads and/or or the partial composite thread can be freely selected individually for each of the partial threads and/or the partial composite threads. Here, the process parameter is formed essentially by the nature of the fluid that is used for conveying and plug formation during crimping. In this case, both the temperature of the fluid and the pressure of the fluid that is fed to the texturing nozzles are preferably designed to be controllable.

For this purpose, several supply lines with several adjustment means are assigned to the texturing nozzles of the crimping device in such a way that the texturing nozzles can be controlled independently of one another. In this way, the fluid can be freely adjusted in terms of temperature and pressure at each of the texturing nozzles.

In order to generate further color effects when the partial composite thread is formed from several partial threads, the variant of the method is provided in which the partial threads of the partial composite thread are mechanically mixed before stretching. Compared to the turbulence, this results in elongated mixing zones of the filaments, which result in a particularly high color separation in a carpet produced from the composite thread in a subsequent post-interlacing.

For this purpose, the melt-spinning device has a mixing device for mechanically mixing a plurality of partial threads, which is arranged upstream of the stretching device.

The method according to the invention for producing a crimped multicolored composite thread and the melt-spinning device according to the invention have the particular advantage that a plurality of different carpet yarns can advantageously be produced in a single-stage process. So it is common in the prior art to use yarn effects with high color separation to be generated by a downstream secondary process. This can advantageously be omitted by the method according to the invention and the device according to the invention. Yarn effects in the composite thread with extremely high color separation can advantageously be produced in one process step. In addition, relatively high production speeds can be achieved.

Further effects can also be achieved in that the partial threads and/or the partial composite threads receive a final swirl after texturing and before being brought together to form the composite thread. For this purpose, a final swirling device is arranged downstream of the crimping device in the yarn path. For this purpose, the end-intermingling device could be arranged between godets and have a separate end-intermingling nozzle for each partial thread.

The method according to the invention for producing a crimped multicolored composite thread is explained in more detail below with reference to some exemplary embodiments of the melt-spinning device according to the invention.

Fig. 1

schematisch ein erstes Ausführungsbeispiel der erfindungsgemäßen Schmelzspinnvorrichtung zur Durchführung des erfindungsgemäßen Verfahrens

Fig. 2

schematisch das Ausführungsbeispiel der erfindungsgemäßen Schmelzspinnvorrichtung nach Fig. 1 bei geänderter Verfahrensführung

Fig. 3

schematisch eine Ausführungsvariante des Ausführungsbeispiels der erfindungsgemäßen Schmelzspinnvorrichtung aus Fig. 1

They represent:

1

schematically shows a first exemplary embodiment of the melt-spinning device according to the invention for carrying out the method according to the invention

2

schematically the embodiment of the melt spinning device according to the invention 1 with a change in procedure

3

schematically shows a variant of the embodiment of the melt spinning device according to the invention 1

In 1 a first exemplary embodiment of the melt-spinning device according to the invention for carrying out the method according to the invention for the production of a crimped multicolored composite thread is shown schematically.

The melt spinning device has a spinning device 1 , a cooling device 2 , a preparation device 12 , a pre-intermingling device 3 , a drawing device 4 , a post-intermingling device 5 , a crimping device 6 , a compounding device 7 and a winding device 8 . The devices of the melt spinning device are arranged to form a yarn path in a machine frame, not shown here.

the inside 1 The vertical grain shown is an example. In principle, the devices can be arranged one below the other or next to one another.

The facilities used to produce several colored polymers are not shown here. Thus, the spinning device 1 is usually coupled with three extrusion devices in order to obtain three polymer melts of different colors.

In this exemplary embodiment, the spinning device 1 has a spinning beam 1.2, which carries a plurality of spinning nozzles 1.1 on its underside. The spinning beam 1.2 is designed to be heated. Each of the spinnerets 1.1 is coupled via a separate melt feed 1.3 to several spinning pumps--not shown here. A polymer melt can thus be extruded into a large number of filaments at each of the spinnerets 1.1. For this purpose, the spinnerets 1.1 have a plurality of nozzle bores on their undersides.

According to the embodiment 1 a total of three spinnerets 1.1 are provided in order to extrude three differently colored filament bundles. In this respect, the melt spinning device shown is particularly suitable for producing a so-called tricolor composite thread.

The spinning device 1 is directly downstream of the cooling device 2, through which the freshly extruded filaments are cooled. For cooling, the filaments are preferably subjected to cooling air in the cooling device 2 . In this case, the cooling air can be supplied radially from the inside to the outside, transversely or radially from the outside to the inside.

In order to bring the filaments together into bundles and into a partial thread 9 after cooling, a preparation device 12 and several collecting thread guides 13 are assigned to the cooling device 2 . The preparation device 12 has at least one wetting agent 12.1 in order to prepare the partial threads 9 together. However, there is also the possibility that the preparation device 12 contains several wetting agents 12.1, so that each of the partial threads 9 can be wetted separately.

The partial threads 9 are initially treated by the pre-interlacing device 3. The pre-interlacing device 3 has a plurality of pre-interlacing nozzles 3.1, which are coupled to a compressed air source (not shown here) by separate compressed air lines 3.2 and separate compressed air adjusting means 3.3. In this exemplary embodiment, the pre-interlacing device 3 has a total of three separate pre-interlacing nozzles 3.1, so that each of the partial threads 9 could receive separate pre-interlacing in the pre-interlacing nozzles 3.1.

The pre-interlacing device 3 is followed by the stretching device 4, which has several godets 4.1 and 4.2 for stretching the partial threads 9. The galettes 4.1 and 4.2 are preferably designed as galettes wrapped around several times, the galette jacket of which is preferably designed to be heatable. The partial threads 9 can thus be thermally treated and stretched.

At this point it should be expressly mentioned that the design of the stretching device 4 is exemplary. In principle, the stretching device 4 can also have several godets in order to stretch the partial threads 9 in several stages.

The stretching device 4 is followed by the post-intermingling device 5 in the thread path. The post-intermingling device 5 has several post-intermingling nozzles 5.1, which are connected to a compressed air source, not shown here, by several compressed air supply lines 5.2 and several compressed air adjusting means 5.3. In this respect, the after-swirl nozzles 5.1 can be controlled separately, with the respective setting of the compressed air being freely selectable. In this exemplary embodiment, a separate post-intermingling nozzle 5.1 is also assigned to each partial thread.

The after-intermingling device 5 is followed by the crimping device 6. The crimping device 6 is designed as what is known as a stuffer box crimp and has a number of texturing nozzles 6.1 for this purpose. Each of the texturing nozzles 6.1 is designed in two parts and has a conveying part and a compression part in order to compress a fed thread into a thread plug. Here, the filaments are deposited in arches and loops, resulting in a crimp. For this purpose, the texturing nozzles 6.1 are connected to a fluid source (not shown here) with a plurality of supply lines 6.2 and a plurality of adjustment means 6.3. The fluid can be each heated separately to each texturing nozzle 6.1 to a predetermined temperature by a plurality of heating means 6.4. The respective setting means 6.3 are suitable for controlling both the heating temperature of the fluid and the pressure of the fluid. In this respect, each of the texturing nozzles 6.1 of the crimping device 6 can be controlled separately. In this exemplary embodiment, the crimping device 6 has three texturing nozzles 6.1, so that each of the partial threads 9 produced in the spinning device 1 could be textured separately.

The pre-intermingling nozzles 3.1 of the intermingling device 3, the post-intermingling nozzles 5.1 of the post-intermingling device 5 and the texturing nozzles 6.1 of the crimping device 6 are designed in their guide cross sections in such a way that, as an alternative to the partial threads 9, a partial composite thread 10 formed from several partial threads 9 could also be treated. So is in the embodiment according to 1 the production of a composite thread 11 is shown, in which initially all partial threads 9 are separately pre-interlaced in the pre-interlacing device 3 through the pre-interlacing nozzles 3.1. After the partial threads 9 have been stretched, two of the partial threads 9 are brought together to form a partial composite thread 10 and post-interlaced parallel to the third partial thread 9 in the post-interlacing device 5 through two of the post-interlacing nozzles 5.1. One of the after-interlacing nozzles 5.1 remains inoperative in this case.

In the subsequent crimping device 6, only two texturing nozzles 6.1 are also used in order to crimp the partial composite thread 10 and the third partial thread 9 separately. To this extent, different mixed colors can be produced in the later compound thread 11 .

The thread plugs 15 produced by the crimping device 6 are cooled on the circumference of a cooling drum 14 and by a downstream one Withdrawal device 17 resolved into a crimped partial composite thread 10 and a crimped partial thread 9 . The crimped threads are then brought together in the compound device 7 to form the compound thread 11 . The connecting device 7 is preferably formed here by a tangle nozzle, in which the partial thread 9 and the partial compound thread 10 are connected to one another by a plurality of tangle knots.

In order to obtain a thread tension for setting when tangles in the compound device 7 independently of a winding, the compound device 7 is preferably arranged downstream of a further godet unit.

At the end of the process, the composite thread 11 is wound up into a spool 18 in the winding device 8 .

In the method according to the invention, with the in 1 illustrated melt spinning device is executable, several partial threads 9 are first produced separately in the spinning device 1. In order to obtain a yarn with different properties such as colour, brilliance, titre, number of filaments, cross section or polymer, the treatment stages of pre-interlacing, post-interlacing and crimping can be used individually. Thus, the partial threads 9 can be pre-interlaced, post-interlaced and crimped separately or partially together. Due to the adjustability of the individual nozzles in the pre-intermingling device 3, the post-intermingling device 5 and the crimping device 6, a high degree of flexibility is ensured in order to produce the respectively desired thread type of the composite thread. Here, properties can be created on the composite thread that can otherwise only be realized in a multi-stage process.

In 2 is the embodiment of the melt spinning apparatus 1 shown, with a modified thread type of the composite thread 11 is generated. in the in 2 illustrated embodiment, two of the partial threads 9 are brought together immediately after cooling to form a partial composite thread 10 and separately pre-interlaced in parallel next to the third partial thread 9 through the pre-interlacing nozzles 3.1. The sub-composite thread 10 formed in this way and the sub-thread 9 are then hidden and separately after-intermingled and crimped. To this extent, a differently crimped multicolored compound thread 11 is produced.

At the in 1 and 2 In the illustrated exemplary embodiments of the method according to the invention, the multicolored filaments are mixed with one another by compressed air treatments and by crimping in the partial composite thread 10 . In principle, however, there is also the possibility of mixing the multicolored filaments of two partial threads by mechanical means. For this is in 3 An exemplary embodiment is shown in which a mixing device 16 is used to combine two partial threads 9 into a partial composite thread 10. The mixing device 16 could be arranged upstream of the stretching device 4, so that the partial threads are brought together to form the partial composite thread 10 after being pre-interlaced by the mixing device 16 . In 3 the mixing device 16 is formed by a rotating cam roller 16.1, in which the filaments of the partial threads 9 are mixed by a movement transverse to the thread running direction. In this way, other distributions of the filaments can be realized within the partial composite thread 10, which subsequently leads to certain color effects due to the after-intermingling and crimping.

In order to achieve further color and yarn effects, 4 Another embodiment of the device according to the invention is shown in a partial view. The thread path from the crimping device 6 to a winding device 8 is shown here. The devices that are arranged upstream of the crimping device 6 are identical to the exemplary embodiment 1 and 2 , so that no further explanation is given and reference is made to the above description.

At the in 4 illustrated embodiment, the crimping device 6 is followed by a final swirling device 19 . The final swirling device 19 is integrated in the take-off device 17, which is formed by two take-off godets 17.1 and 17.2. The final swirling device 19 is arranged between the take-off godets 17.1 and 17.2. The final swirling device 19 has a plurality of final swirling nozzles 19.1, which are coupled to a compressed air source, not shown here, by separate compressed air supply lines 19.2 and separate compressed air actuating means 19.3. In this exemplary embodiment, the end-interlacing device 19 has a total of three separate end-interlacing nozzles 19.1, so that each of the partial threads 9 could receive a separate end-interlacing in the end-interlacing nozzles 19.1.

At the in 4 illustrated embodiment, only two end-interlacing nozzles 19.1 are activated, so that a partial thread 9 and a partial composite thread 10 receive a final interlacing after crimping. The final turbulence of the crimped threads 9 and 10 thus leads to further special effects when combined to form a composite thread 11.

In the method according to the invention and in the melt-spinning device, the pre-interlacing and the post-interlacing can be effected either by rotating interlacing nozzles or by static interlacing nozzles be generated. This allows further effects to be realized. In particular with a rotating swirl nozzle, such as those from EP 2 646 608 B1 is known, very intense turbulence of the filaments can be generated. In this respect, the known rotating intermingling nozzle is particularly suitable for carrying out pre-intermingling and/or post-intermingling.

Claims (14)

1. Method for producing in a melt spinning method a crimped multicolored composite thread from a plurality of extruded sub-threads in the following steps:

   1.1. separately extruding a plurality of colored filament bundles, and cooling the filament bundles;

   1.2. separately gathering the filament bundles so as to form the separate sub-threads;

   1.3. separately pre-interlacing the individual sub-threads and/or a composite sub-thread formed from a plurality of sub-threads;

   1.4. drafting the sub-threads and the composite sub-thread;

   1.5. separately post-interlacing the individual sub-threads and/or the composite sub-thread formed from a plurality of sub-threads;

   1.6. separately texturizing the individual sub-threads and/or the composite sub-thread;

   1.7. collecting the sub-threads and the composite sub-thread so as to form the composite thread; and

   1.8. winding the composite thread so as to form a wound package.
2. Method according to Claim 1, characterized in that at least one process parameter for the pre-interlacing of the individual sub-threads and/or the composite sub-thread is freely selectable individually for each of the sub-threads and/or the composite sub-thread.
3. Method according to Claim 1 or 2, characterized in that at least one process parameter for the post-interlacing of the individual sub-threads and/or the composite sub-thread is freely selectable individually for each of the sub-threads and/or the composite sub-thread.
4. Method according to Claim one of Claims 1 to 3, characterized in that at least one process parameter for the crimping of the individual sub-threads and/or the composite sub-thread is freely selectable individually for each of the sub-threads and/or the composite sub-thread.
5. Method according to one of Claims 1 to 4, characterized in that the sub-threads are wetted with a spin-finish agent when separately gathering the filament bundles.
6. Method according to one of Claims 1 to 5, characterized in that the sub-threads of the composite sub-thread are mechanically mixed prior to the drafting of the composite sub-thread.
7. Method according to one of Claims 1 to 6, characterized in that the thread plugs generated when crimping the sub-threads and/or composite sub-threads are separately cooled.
8. Melt spinning device for carrying out the method according to one of Claims 1 to 7, having a spinning installation (1) having a plurality of spinning nozzles (1.1), a cooling installation (2), a plurality of collective thread guides (13), a pre-interlacing installation (3) having a plurality of pre-interlacing nozzles (3.1), a drafting installation (4) having a plurality of godets (4.1, 4.2), a post-interlacing installation (5) having a plurality of post-interlacing nozzles (5.1), a crimping installation (6) having a plurality of texturizing nozzles (6.1), an interconnecting installation (7), and a winding installation (8), characterized in that the pre-interlacing nozzles (3.1) of the pre-interlacing installation (3), the post-interlacing nozzles (5.1) of the post-interlacing installation (5), and the texturizing nozzles (6.1) of the crimping installation (6) are configured in such a manner that selectively an individual sub-thread (9) or a composite sub-thread (10) formed from a plurality of sub-threads (9) is treatable.
9. Melt spinning device according to Claim 8, characterized in that the pre-interlacing nozzles (3.1) of the pre-interlacing installation (3) are assigned a plurality of compressed-air infeed lines (3.2) having separate compressed-air actuating means (3.3) in such a manner that the pre-interlacing nozzles (3.1) are controllable in a mutually independent manner.
10. Melt spinning device according to Claim 8 or 9, characterized in that the post-interlacing nozzles (5.1) of the post-interlacing installation (5) are assigned a plurality of compressed-air infeed lines (5.2) having separate compressed-air actuating means (5.3) in such a manner that the post-interlacing nozzles (5.1) are controllable in a mutually independent manner.
11. Melt spinning device according to one of Claims 8 to 10, characterized in that the texturizing nozzles (6.1) of the crimping installation (6) are assigned a plurality of supply lines (6.2) having a plurality of setting means (6.3) in such a manner that the texturizing nozzles (6.1) are controllable in a mutually independent manner.
12. Melt spinning device according to one of Claims 8 to 11, characterized in that a preparation installation (12) which has one or a plurality of wetting agents for wetting the sub-threads is assigned to the collective thread guides (13).
13. Melt spinning device according to one of Claims 8 to 12, characterized in that the drafting installation (4) is pre-assigned a mixing installation (16) for mechanically mixing a plurality of sub-threads (9) of a composite sub-thread (10).
14. Melt spinning device according to one of Claims 8 to 13, characterized in that the crimping installation (6) is assigned a rotatable cooling drum (14) for receiving and cooling a plurality of thread plugs (15).

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