JP2024523676A - Apparatus for processing at least one multifilament yarn - Google Patents

Abstract

The invention relates to an apparatus for processing at least one multifilament yarn, comprising a moistening device for applying a liquid to the yarn and an interlacing device for forming interlacing nodes in the moistened yarn. For this purpose, the moistening device and the interlacing device are arranged one behind the other in the yarn path. In order to be able to utilize the dynamic effects resulting from the interlacing of the yarn for moistening, the distance between the outlet of the moistening device and the inlet of the interlacing device is selected in accordance with the invention in such a way that the vibrations generated by the interlacing act on the yarn in the moistening channel of the moistening device.

Description

The present invention relates to an apparatus for processing at least one multifilament yarn, as defined in the generic concept of claim 1.

A device for processing at least one multifilament yarn according to the generic concept is known from DE 10 2019 116 512 A1.

During the production of the composite yarns, these are each formed from a number of very fine filament bundles. In order to ensure the cohesion of the filament bundles in the yarn, it is basically known to wet the multifilament yarn with a preparation liquid and to entangle the filament bundles of the multifilament yarn with compressed air. That is, it is well known that after the filament bundles have been extruded and the filaments have been cooled, the multifilaments are first wetted and entangled in order to converge. However, in order to enable the drawing of the yarn, the filament bundles are then entangled with compressed air at a relatively low operating pressure, thereby avoiding the formation of so-called entanglement nodes. At the end of the melt spinning process, the yarn is wound up on a yarn package for aftertreatment. For this purpose, it is also common to entangle the multifilament yarn again, but in this case compressed air at a higher operating pressure is used to form the entanglement nodes in the yarn.

It is now known from DE 10 2019 116 512 A1 that the formation of interlacing nodes in multifilament yarns can be positively influenced by a preceding moistening of the yarn. For this purpose, the known device has a moistening device for applying liquid and an interlacing device for forming interlacing nodes, the moistening device and the interlacing device being arranged one behind the other in the yarn run. In this way, the yarns moistened with liquid can then be entangled by compressed air to form interlacing nodes. For this purpose, the known device has separate moistening devices and separate interlacing devices arranged in the yarn run at a relatively large distance from each other.

Basically, however, such devices for processing multifilament yarns are also known, in which the wetting and entangling of the yarns are performed at relatively short intervals from one another. For example, WO 2009/013107 discloses a device for processing at least one multifilament yarn, in which the wetting device and the entangling device are arranged in one housing. In this case, the yarn is displaced between the wetting device and the entangling device by a yarn guide element. This prevents the dynamic effects caused by the entangling of the yarn from propagating in the opposite direction to the yarn running direction. This allows a stable and relatively quiet yarn running to be achieved during the wetting of the multifilament yarn. The application of the liquid by the wetting device is performed by a preparation pin, which applies the fluid directly to the yarn at its tip. However, this leads to the problem that the fluid is only distributed around the circumference of the yarn.

The object of the present invention is therefore to improve the device for processing at least one multifilament yarn as described in the generic concept, in such a way that the most intensive possible distribution of fluid into the interior of the yarn is achieved already before entanglement occurs.

Another object of the present invention is to improve the effectiveness of forming intertwining nodes in wetted yarns.

This problem is solved according to the present invention by selecting the distance between the outlet of the moistening device and the inlet of the interlacing device so that the vibrations caused by the interlacing act on the yarn in the moistening groove of the moistening device.

"Affect" means, in the context of the present invention, in particular that the vibrations induced in the yarn by the interlacing device cause a displacement of the yarn transversely to the yarn running direction and at least partially in the moistening groove of the moistening device. In other words, such yarn parts located in the moistening groove of the moistening device preferably perform a sinusoidal wiping action.

The above problem is similarly solved by an apparatus for processing at least one multifilament yarn, the apparatus comprising a moistening device for applying liquid to the yarn and an interlacing device for forming interlacing nodes in the moistened yarn, the moistening device and the interlacing device being arranged in tandem within the yarn path, and the distance between the outlet of the moistening device and the inlet of the interlacing device being within the range of 50 mm to 1000 mm.

The above problem is similarly solved by a method for processing a multifilament yarn, in which the fully drawn yarn is moistened with a liquid by a moistening device, and in a subsequent yarn run, the yarn is guided by an interlacing device which forms interlacing nodes in the moistened yarn, and the distance between the outlet of the moistening device and the inlet of the interlacing device is selected such that vibrations induced in the yarn by the interlacing device cause at least partial lateral displacement of the yarn portion located in the moistening groove of the moistening device and/or the distance between the outlet of the moistening device and the inlet of the interlacing device is selected in the range of 50 mm to 1000 mm.

Advantageous improvements of the present invention are defined by features and combinations of features.

The inventors are relieved from the requirement of keeping the dynamic action of the yarn, which is caused by entanglement and propagates in the opposite direction to the yarn running direction, away from the dampening device. On the contrary, the inventors have realized that the vibration acting on the yarn actually improves the absorption and distribution of the liquid when moistening the yarn. In other words, the yarn is guided through a dampening groove in the dampening device, so that even in the case of relatively high yarn running speeds, which can be in the range of 4000-5000 m/min, a focused and uniform moistening of the yarn filament bundle is obtained. At the same time, the uniformity and quality of the entanglement nodes formed during the subsequent entanglement in the entanglement device are improved. The device according to the invention is therefore particularly advantageous for producing a sufficient concentration of the yarn for post-processing in fully drawn yarns in a melt spinning process.

The dynamic and twisting action occurring during interlacing of the yarns is substantially determined by the working pressure of the interlacing device. The higher the working pressure of the compressed air, the more powerful the interlacing of the yarns. In this respect, the improvement of the invention is preferably formed in such a way that the distance between the outlet of the moistening device and the inlet of the interlacing device is in the range of 50 mm to 1000 mm depending on the working pressure of the interlacing device. That is to say, before the process, a distance between the outlet of the moistening device and the inlet of the interlacing device can be selected that is adapted to the working pressure. The working pressure is in the range of 2 bar to 5 bar. It has been found to be advantageous if the working pressure is greater than 2.5 bar. Particularly preferably, the working pressure is at least 3 bar.

It has proven advantageous for the distance between the outlet of the moistening device and the inlet of the interlacing device to be in the range of 50 mm to 1000 mm. It has proven advantageous for this distance to be in the range of 50 mm to 250 mm. In one particularly preferred configuration, this distance is greater than 100 mm and/or less than 200 mm.

In order to be able to carry out the process as flexibly as possible, the present refinement provides for the spacing between the outlet of the moistening device and the inlet of the interlacing device to be adjustable by moving the moistening device and/or the interlacing device. This means that the spacing can be changed during the process, which allows fine adjustments to be made depending on the current operating pressure of the interlacing device.

In a refinement of the invention, which is used when the running of the yarn is to be assisted by a yarn guide, the yarn guide is arranged between the outlet of the dampening device and the inlet of the interlacing device, in which the yarn can be guided with a wrap angle in the range of 0° to 10°. Larger wraps must be avoided, since otherwise the passage of the vibrations of the yarn is hindered. A small wrap of the yarn in the yarn guide allows the unhindered passage of the vibrations and a twisting action inside the yarn.

In an advantageous refinement of the invention, which is used to distribute the liquid evenly to the yarn even at relatively high yarn running speeds, the dampening groove of the dampening device has a contact surface at the groove base having a length of at least 20 mm. This allows the fluid to be supplied to the yarn over a greater distance.

In this case, the liquid is supplied to the bottom of the groove of the moistening device through a fluid passage that preferably opens into the bottom of the groove just before the contact surface and is connectable to a fluid source.

In order to achieve the most flexible possible use with regard to the various melt spinning processes of the synthetic yarn, it is furthermore envisaged that the moistening device is removably held on the support.

In order to make the maximum possible use of the dynamic action caused by the interlacing for moistening, in a particularly advantageous refinement of the invention, the interlacing device has a yarn passage that matches the moistening groove of the moistening device. Thus, after the yarn has exited the moistening groove, it can be introduced directly into the yarn passage without contact.

A dynamic effect can be achieved during interlacing, in particular if the interlacing device has air passages that open transversely into the yarn passage and that can be connected to a compressed air source. For example, the air passages can open into the yarn passage inclined in the yarn running direction or in a direction opposite to the yarn running direction. An eccentric supply of compressed air, in particular into the yarn passage and via the air passage, promotes twisting in the yarn.

In a preferred refinement of the present invention, which is suitable for enabling parallel processing of multiple yarns simultaneously in one melt spinning process, the dampening device has multiple dampening grooves arranged side by side in parallel, and the interlacing device has guide passages corresponding to each dampening groove. This allows the yarns produced in the spinning station to be simultaneously moistened with liquid in parallel and then interlaced with compressed air.

However, the device according to the invention for processing at least one multifilament yarn is particularly suitable for the production of so-called fully oriented yarns due to its flexibility for all known production processes.

In one particularly preferred configuration, the intertwining device is formed as a tangle nozzle. The intertwining device is not particularly formed as a migration nozzle.

In one other particularly preferred configuration, the humidifying device and the interlacing device are formed as an integral component.

It has proven advantageous if the device is downstream of a drawing device for drawing the multifilament yarn. It has proven advantageous if the drawing device has at least one heatable godet. The drawing device may be configured as an FDY drawing area. The drawing device may be downstream of a melt spinning device.

It has been found to be advantageous if the distance between the yarn transfer point of the last godet of the drawing device and the inlet of the moistening device is less than 1000 mm. It has been found to be advantageous if this distance is in the range of 50 mm to 1000 mm, particularly preferably in the range of 100 mm to 500 mm, and even more preferably in the range of 250 mm to 350 mm.

The present invention will now be described in more detail with reference to the accompanying drawings, which are based on some embodiments of the device according to the present invention for processing multifilament yarns.

1 shows a schematic longitudinal section of a first embodiment of the device according to the invention for processing a single multifilament yarn; FIG. FIG. 2 is a cross-sectional view showing a schematic view of the humidifier of the embodiment shown in FIG. 1 . FIG. 2 is a cross-sectional view showing the interlacing device of the embodiment shown in FIG. 1 . FIG. 2 shows a schematic longitudinal section of another embodiment of the device according to the invention for processing a single multifilament yarn. FIG. 2 shows a schematic diagram of another embodiment of an apparatus according to the invention for processing a plurality of multifilament yarns. FIG. 2 shows a schematic representation of the device shown in FIG. 1 downstream of a stretching device.

1, 2 and 3 show a first embodiment of an apparatus 100 according to the invention for processing a multifilament yarn in several views. In FIG. 1 a longitudinal section is shown, in FIG. 2 a cross section of a moistening device and in FIG. 3 a cross section of an interlacing device. To describe the apparatus as a whole, reference is first made to the embodiment shown in FIG. 1.

In the embodiment of the device 100 according to the invention for processing a multifilament yarn shown in FIG. 1, a moistening device 1 and an interlacing device 2 are arranged one behind the other in the yarn path of the yarn 3 at a distance from each other. The moistening device 1 has an inlet 5.1 at one end face and an outlet 5.2 at the opposite end face. Correspondingly, the interlacing device 2 has an inlet 10.1 and an outlet 10.2. The inlet 10.1 of the interlacing device 2 and the outlet 5.2 of the moistening device 1 are located opposite each other and are arranged at a distance from each other. In FIG. 1, this distance is indicated by the letter A.

To explain the humidification device 1, in addition to FIG. 1, reference is made additionally to FIG. 2. In this respect, the following description applies to FIGS. 1 and 2.

The dampening device 1 has a dampening groove 4 extending between an inlet 5.1 and an outlet 5.2. In the region of the inlet 5.1, a fluid passage 7 opens into the groove bottom 4.1 of the dampening groove 4. The fluid passage 7 is connected to a fluid source 8. In this embodiment, the fluid source 8 is formed by a metering pump 8.1 and a tank 8.2, which contains a liquid for wetting the yarn 3. At the groove bottom 4.1, a contact surface 4.2 extends between the outlet 5.2 and the fluid passage 7. The contact surface 4.2 has a length, which in this embodiment is indicated by the symbol L. A typical length of the contact surface 4.2 is at least 20 mm. The dampening device 1 is held movably on the support 6, so that the distance A can be changed. In this case, the dampening device 1 can be fixed at any position on the support 6.

To explain the interlacing device 2, reference is now made to Figs. 1 and 3. In this respect, the following description applies to both figures.

The interlacing device 2 has a yarn passage 9 extending between an inlet 10.1 and an outlet 10.2. A lateral threading slit 11 is arranged corresponding to the yarn passage 9, which extends over the long side of the interlacing device 2 and allows the insertion of the yarn into the yarn passage 9. In the middle region of the interlacing device 2, an air passage 12 is provided, which is formed transversely to the yarn passage 9. The air passage 12 opens into the yarn passage 9 and is connected to a compressed air source 13 via a control valve 14. In this embodiment, the air passage 12 opens into the yarn passage 9 at an angle to the yarn running direction.

Now, to explain the functionality of this embodiment, we refer only to Figure 1.

During operation, the moistening device 1 is supplied with a liquid, for example an aqueous solution, by a fluid source 8 into the fluid passage 7. The liquid reaches the groove bottom 4.1 of the moistening groove 4 via the fluid passage 7. The continuously running yarn 3 drags the liquid along the contact surface 4.2 and thus absorbs it. In this case, the distribution of the liquid inside the multifilament yarn is assisted by vibration and twist phenomena that arise due to the intertwining of the yarns and propagate in the opposite direction to the yarn running direction.

For interlacing, compressed air is introduced into the yarn channel 9 in the interlacing device 2 via the air channel 12. The compressed air is supplied to the air channel via a compressed air source 13 and a control valve 14 at a predefined operating pressure in the range of 2-5 bar. Depending on the operating pressure, the yarn 3 is interlaced in the yarn channel. This causes a vibration and twisting action inside the yarn, which propagates in a direction opposite to the yarn running direction. This dynamic action and vibration inside the yarn is shown diagrammatically in FIG. 1 by the dashed yarn run. The yarn 3 is otherwise shown with the interlacing device 2 inactive.

In order for the vibrations to be absorbed by the dampening groove 4 of the dampening device 1 and to be available for distributing the liquid to the yarn 3, a distance A between the outlet 5.2 of the dampening device 1 and the inlet 10.1 of the interlacing device 2 must be maintained. Depending on the operating pressure of the interlacing device 2, this distance lies in the range of 50 mm up to 1000 mm. During actual use, the vibrations in the yarn can be perceived by the operator, so that an adjustment of the distance A depending on the operating pressure of the interlacing device 2 is possible.

In the embodiment shown in FIG. 1, the yarn 3 is guided in a straight yarn path between the moistening device 1 and the interlacing device 2 in a contactless manner. In principle, however, it is also possible to arrange one yarn guide each corresponding to the inlet 10.1 and the outlet 10.2 for guiding the yarn in the interlacing device 2. In this regard, FIG. 4 shows a schematic longitudinal section of a further embodiment of the device according to the invention for processing at least one multifilament yarn. The embodiment shown in FIG. 4 is substantially identical to the embodiment shown in FIG. 1, so that only the differences will be described here and in the rest please refer to the above description.

In the embodiment shown in FIG. 4, a yarn guide 15.1 is arranged between the outlet 5.2 of the moistening device 1 and the inlet 10.1 of the interlacing device 2. A second yarn guide 15.2 is arranged on the opposite outlet side of the interlacing device 2. The yarn 3 is thus guided by one yarn guide 15.1, 15.2 upstream of the inlet 10.1 of the interlacing device 2 and downstream of the outlet 10.2 of the interlacing device 2. In the yarn guide 15.1 between the moistening device 1 and the interlacing device 2, the yarn is guided with a relatively small winding angle. The winding angle is shown diagrammatically in FIG. 4 and is designated by the letter a. The winding angle a has a maximum value of 10°, so as not to prevent the passing and feedback of vibrations inside the yarn 3. Such a small winding angle a in the range from 0 to a maximum of 10° ensures the transmission of the receding vibrations inside the yarn 3, depending on the size of the gap.

The function of the embodiment of the device according to the invention shown in FIG. 4 is therefore identical to the embodiment shown in FIG. 1, so reference is made to the above description to avoid repetition.

In the melt spinning process, it is common for several yarns to be spun, drawn and wound up simultaneously in a spinning station as a single yarn group. In this regard, FIG. 5 shows another embodiment of the device according to the invention for processing several multifilament yarns. FIG. 5 shows a schematic diagram of this embodiment. In this case, a dampening device 1 and an interlacing device 2 are shown arranged one after the other in the yarn path. The dampening device 1 has several dampening grooves 4. In the interlacing device 2, several yarn channels 9 are arranged corresponding to each dampening groove 4. The yarn channels 9 each have a lateral threading slit 11, so that the yarns can be introduced into the yarn channels 9 at the start of the process. In this case, the configuration of the dampening grooves 4 of the dampening device 1 and the configuration of the yarn channels 9 of the interlacing device 2 are identical to the above-mentioned embodiment. The connection of the dampening grooves 4 to the fluid source is not shown in detail here. Basically, all dampening grooves 4 can be supplied with liquid simultaneously from one central supply channel. In principle, however, it is also possible to supply each moistening groove with an individually metered amount of fluid.

In the interlacing device 2, compressed air is preferably supplied to a number of air passages (not shown here) via one common compressed air connection, thereby causing interlacing of the yarns 3 in each yarn passage 9.

In the embodiment shown in FIG. 5, the humidifier 1 and the interlacing device 2 are fixedly positioned, so that the distance A between the outlet side 16 of the humidifier 1 and the inlet side 17 of the interlacing device 2 is fixed. In this case, no adjustment means is provided.

In the above-mentioned exemplary embodiment shown in Figs. 1 and 4, the moistening device 1 is held movably on the support 6 in order to adjust the distance A. In principle, however, it is also possible to alternatively configure the interlacing device 2 displaceably on the support, i.e. the moistening device 1 can be configured stationary and the interlacing device 2 can be configured movably. However, in another alternative configuration, both devices are also configured displaceably.

Additionally, in the embodiment shown in Figs. 1 and 4, the moistening device 1 provided on the support 6 can also be made removable. Such a configuration of the device according to the invention is preferably used to allow the use of a wide variety of processes for producing multifilament yarns.

In order to produce the greatest possible number of evenly distributed interlacing nodes within the yarn, the yarn is moistened by an aqueous liquid moistening device.

Finally, FIG. 6 shows the device according to FIG. 1 downstream of a drawing device 200. The drawing device 200 is shown in this example diagrammatically with a number of godets 201, 202, 203, 204. The number and arrangement of the godets 201, 202, 203, 204 can be varied depending on the melt spinning method in question, and the godets 201, 202, 203, 204 can be designed as heated or unheated. The godets 201, 202, 203, 204 can be operated at different rotational speeds, for example, to reach the drawing zone between the godets 202 and 203. The drawing device 200 shown in FIG. 6 is, for example, an FDY drawing area that can be downstream of a melt spinning device, not shown here.

Claims (15)

An apparatus for processing at least one multifilament yarn, comprising a moistening device (1) for applying a liquid to the yarn, and an entangling device (2) for forming entanglement nodes in the moistened yarn, the moistening device (1) and the entangling device (2) being arranged one behind the other in a yarn path,
13. The device according to claim 12, wherein the distance (A) between the outlet (5.2) of the moistening device (1) and the inlet (10.1) of the interlacing device (2) is selected such that the vibrations caused by the interlacing act on the yarns (3) in the moistening grooves (4) of the moistening device (1). The device according to claim 1, wherein the distance (A) between the outlet (5.2) of the humidifier (1) and the inlet (10.1) of the interlacing device (2) is in the range of 50 mm to 1000 mm depending on the operating pressure of the interlacing device (2). The device according to claim 1 or 2, wherein the distance (A) between the outlet (5.2) of the moistening device (1) and the inlet (10.1) of the interlacing device (2) is adjustable by moving the moistening device (1) and/or by moving the interlacing device (2). The device according to any one of claims 1 to 3, wherein a yarn guide (15.1) is arranged between the outlet (5.2) of the moistening device (1) and the inlet (10.1) of the interlacing device (2), and in the yarn guide (15.1) the yarn (3) can be guided at a winding angle (a) in the range of 0° to 10°. The device according to any one of claims 1 to 4, wherein the moistening groove (4) of the moistening device (1) has a contact surface (4.2) at the groove bottom (4.1) having a length of at least 20 mm. The device according to claim 5, wherein the moistening groove (4) of the moistening device (1) has a fluid passage (7) connectable to a fluid source (8) in the groove bottom (4.1) before the contact surface (4.2) as seen in the yarn running direction. The device according to any one of claims 1 to 6, wherein the humidifier (1) is removably held on a support (6). The device according to any one of claims 1 to 7, wherein the interlacing device (2) has a yarn passage (9) that is aligned with the moistening groove (4) of the moistening device (1). The device according to claim 8, wherein the interlacing device (2) has an air passage (12) opening laterally into the yarn passage (9), the air passage (12) being connectable to a compressed air source (13). The device according to any one of claims 1 to 9, wherein the moistening device (1) has a plurality of moistening grooves (4) formed in parallel with each other, and the interlacing device (2) has a guide passage (9) corresponding to each of the moistening grooves (4). The device according to any one of claims 1 to 10, wherein the entangling device (2) is formed as a tangling nozzle. The device according to any one of claims 1 to 11, wherein the humidifying device (1) and the interlacing device (2) are formed as an integral component. The apparatus according to any one of claims 1 to 12, which is downstream of a drawing device for drawing the multifilament yarn, the drawing device having at least one heatable godet. An apparatus for processing at least one multifilament yarn, comprising a moistening device (1) for applying a liquid to the yarn, and an entangling device (2) for forming entanglement nodes in the moistened yarn, the moistening device (1) and the entangling device (2) being arranged one behind the other in a yarn path,
13. An apparatus, characterized in that the distance (A) between the outlet (5.2) of the moistening device (1) and the inlet (10.1) of the interlacing device (2) is in the range of 50 mm to 1000 mm. A method for processing a single multifilament yarn, comprising: moistening a fully drawn yarn (FDY) with a liquid by a moistening device; guiding the moistened yarn in a subsequent yarn run through an interlacing device that forms interlacing nodes in the moistened yarn; and selecting a distance between the outlet of the moistening device and the inlet of the interlacing device such that vibrations induced in the yarn by the interlacing device cause at least partial lateral displacement of a portion of the yarn located in the moistening groove of the moistening device and/or the distance between the outlet of the moistening device and the inlet of the interlacing device is in the range of 50 mm to 1000 mm.

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