A device for processing at least one multifilament thread.

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 according to the invention in such a way that the vibrations generated by the interlacing act on the yarn in the moistening groove of the moistening device.

Description

Technical Field

[0001] The present invention relates to an apparatus for processing at least one multifilament yarn as described in the generic concept of claim 1.

Background Art

[0002] An apparatus for processing at least one multifilament yarn as described in the generic concept is known from German Patent Application Publication No. 102019116512.

[0003] In the production of synthetic yarns, these synthetic yarns are each formed from a large number of extremely fine filament bundles. In order to ensure the bundling of the filament bundles in the yarn, it is basically known to wet the multifilament yarn with a preparation liquid and entangle the filament bundles of the multifilament yarn with compressed air. That is, it is well known that after extruding the filament bundles to cool the filaments, the multifilament is first wetted and entangled for bundling. However, in order to then enable stretching of the yarn, the filament bundles are 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 onto a yarn package for post-treatment. For this purpose, it is also common to re-entangle the multifilament yarn, but in this case, compressed air with a higher operating pressure is used to form entanglement nodes in the yarn.

[0004] From the aforementioned German Patent Application Publication No. 102019116512, it is now known that the formation of entanglement nodes in a multifilament yarn can be positively influenced by prior humidification of the yarn. For this purpose, the known apparatus has a humidifier for applying a liquid and an entanglement device for forming entanglement nodes, with the humidifier and entanglement device arranged one after the other in the yarn path. In this way, the yarn, wetted with the liquid, can then be entangled with compressed air to form entanglement nodes. For this purpose, the known apparatus has a separate humidifier and a separate entanglement device arranged in the yarn path at a relatively large distance from each other.

[0005] However, there are also known apparatuses for processing such multifilament yarns in which the humidification and entanglement of the yarn are performed at relatively short intervals from each other. For example, in an apparatus for processing at least one multifilament yarn, as revealed in International Publication No. 2009 / 013107, the humidification device and the entanglement device are arranged in a single housing. In this case, the yarn is displaced between the humidification device and the entanglement device by a yarn guide member. This prevents the dynamic effect caused by the yarn entanglement from propagating in the opposite direction to the yarn's direction of travel. This makes it possible to achieve stable and relatively quiet yarn travel during the humidification of the multifilament yarn. The application of liquid by the humidification device is performed by a preparation pin, which applies the fluid directly to the yarn at its tip. However, this presents the problem that the fluid is only distributed around the yarn. [Overview of the project] [Problems that the invention aims to solve]

[0006] Therefore, the object of the present invention is to improve the apparatus for processing at least one multifilament yarn as described in the higher concept so that the most concentrated distribution of fluid into the yarn is achieved before the occurrence of entanglement. [Means for solving the problem]

[0007] Another object of the present invention is to improve the effect of forming entanglement nodes in a wetted thread.

[0008] This problem is solved, according to the present invention, by selecting the distance between the outlet of the humidifier and the inlet of the entanglement device so that vibrations caused by entanglement act on the threads in the humidifier groove of the humidifier.

[0009] In the context of this invention, "acting" specifically means that the vibrations generated in the yarn by the entanglement device cause displacement of the yarn in a direction lateral to the yarn's direction of travel, and at least partially within the moisture-supplying groove of the moisture-supplying device. In other words, such a portion of the yarn located within the moisture-supplying groove of the moisture-supplying device preferably performs a sinusoidal wiping action.

[0010] The above problem is similarly solved by an apparatus for processing at least one multifilament yarn, comprising a humidifier for applying liquid to the yarn and an entanglement device for forming entanglement nodes in the humidified yarn, wherein the humidifier and the entanglement device are arranged sequentially in the yarn path, and the distance between the outlet of the humidifier and the inlet of the entanglement device is in the range of 50 mm to 1000 mm.

[0011] The above problem is similarly solved by a method for processing a single multifilament yarn, wherein after the yarn is fully drawn, a liquid is supplied to the yarn by a humidifying device, the yarn is then guided by a entanglement device that forms entanglement nodes in the humidified yarn within the yarn path, and the distance between the outlet of the humidifying device and the inlet of the entanglement device is selected such that the vibrations generated in the yarn by the entanglement device cause at least partial lateral displacement of the yarn portion located within the humidifying groove of the humidifying device, and / or the distance between the outlet of the humidifying device and the inlet of the entanglement device is within the range of 50 mm to 1000 mm.

[0012] The advantageous improvements of the present invention are defined by features and combinations of features.

[0013] The inventors are freed from the condition of keeping away from the humidifier the dynamic action of the yarn that occurs due to entanglement and propagates in the opposite direction to the yarn's direction of travel. Conversely, the inventors recognized that the vibrations acting on the yarn actually improve the absorption and distribution of liquid when humidifying the yarn. In other words, the yarn is guided through the humidification groove in the humidifier, thereby achieving concentrated and uniform humidification of the yarn filament bundle even at relatively high yarn travel speeds, which can be in the range of 4000-5000 m / min. At the same time, the uniformity and quality of the entanglement nodes formed during subsequent entanglement in the entanglement device are improved. Therefore, the apparatus according to the present invention is particularly advantageous for generating sufficient yarn bundles for post-processing in fully drawn yarn during the melt spinning process.

[0014] The dynamic and twisting effects that occur when entangling yarns are substantially determined by the operating pressure of the entanglement device. The higher the operating pressure of the compressed air, the stronger the entanglement of the yarns. In this respect, an improvement of the present invention is preferably that the distance between the outlet of the humidifier and the inlet of the entanglement device is formed to be in the range of 50 mm to 1000 mm, depending on the operating pressure of the entanglement device. That is, the distance between the outlet of the humidifier and the inlet of the entanglement device can be selected before the process to match the operating pressure. The operating pressure is in the range of 2 bar to 5 bar. It has been found that an operating pressure greater than 2.5 bar is advantageous. Particularly preferable, the operating pressure is at least 3 bar.

[0015] It was found that a distance of 50 mm to 1000 mm between the outlet of the humidifier and the inlet of the entanglement device is advantageous. It was also found that a distance of 50 mm to 250 mm is advantageous. In one particularly preferred configuration, this distance is greater than 100 mm and / or less than 200 mm.

[0016] To enable the most flexible process possible, the improvements of the present invention assume that the distance between the outlet of the humidifier and the inlet of the entanglement device is formed to be adjustable by the movement of the humidifier and / or the entanglement device. In other words, the distance can be changed during the process, thereby allowing for fine adjustments in response to the operating pressure of the entanglement device at any given time.

[0017] In an improved version of the present invention used when the movement of the yarn should be assisted by a yarn guide, the yarn guide is positioned between the outlet of the humidifier and the inlet of the entanglement device, and the yarn can be guided in the yarn guide at a winding angle in the range of 0° to 10°. Larger windings must be avoided, for they would otherwise hinder the passage of vibrations through the yarn. Small windings of the yarn in the yarn guide allow for unimpeded passage of vibrations and internal twisting action of the yarn.

[0018] An advantageous improvement of the present invention, used to uniformly distribute liquid to the yarn even at relatively high yarn running speeds, is that the humidifying groove of the humidifying device has a contact surface at the bottom of the groove having a length of at least 20 mm. This allows the fluid to be supplied to the yarn over a greater distance.

[0019] In this case, the liquid is preferably supplied to the bottom of the groove of the humidifier via a fluid passage that opens to the bottom of the groove just before the contact surface and is connectable to a fluid source.

[0020] To achieve the most flexible possible use with respect to various melt-spinning processes of synthetic yarns, the humidifying device is also assumed to be detachably held in a support.

[0021] In order to maximize the use of the dynamic effect generated by entanglement for humidification, a particularly advantageous improvement of the present invention is that the entanglement device has a thread passage that aligns with the humidification groove of the humidification device. Therefore, after the thread emerges from the humidification groove, it can be introduced directly into the thread passage without contact.

[0022] The dynamic action can be achieved during entanglement, especially when the entanglement device has an air passage that opens laterally into the yarn passage and the air passage can be connected to a compressed air source. For example, the air passage may be inclined in the yarn running direction or in the direction opposite to the yarn running direction and open into the yarn passage. In particular, the eccentric supply of compressed air through the air passage into the yarn passage promotes the twisting of the yarn.

[0023] In an improvement of the present invention that is preferably used to enable the simultaneous parallel processing of a plurality of yarns in a single melt spinning process, the humidifying device has a plurality of humidifying grooves formed side by side in parallel, and the entanglement device has a guide passage corresponding to each humidifying groove. Thereby, the yarn group generated at the spinning station can be humidified with liquid in parallel and simultaneously, and then entangled by compressed air.

[0024] However, the device according to the present invention for processing at least one multifilament yarn is suitable, in particular, for the production of so-called fully drawn yarns, based on its flexibility with respect to any well-known manufacturing process.

[0025] In one particularly preferred configuration, the entanglement device is formed as a tangle nozzle. The entanglement device is not particularly formed as a migration nozzle.

[0026] In another particularly preferred configuration, the humidifying device and the entanglement device are formed as an integral group of components.

[0027] It has been found advantageous for the device to be后置 to a stretching device for stretching the multifilament yarn. It has been found advantageous for the stretching device to have at least one heatable godet. The stretching device may be formed as a FDY stretching area. The stretching device may be后置 to the melt spinning device.

[0028] It has been found advantageous that the distance between the yarn splicing point of the last godet of the drawing device and the inlet of the humidifying device is less than 1000 mm. It has been found advantageous that this distance is within the range of 50 mm to 1000 mm, particularly preferably within the range of 100 mm to 500 mm, and even more preferably 250 mm to 350 mm.

[0029] The present invention will be described in more detail below based on some embodiments of the device according to the present invention for processing multifilament yarns, with reference to the accompanying drawings.

Brief Description of the Drawings

[0030] [Figure 1] FIG. 1 is a longitudinal sectional view schematically showing a first embodiment of a device according to the present invention for processing a single multifilament yarn. [Figure 2] FIG. 2 is a cross-sectional view schematically showing the humidifying device of the embodiment shown in FIG. 1. [Figure 3] FIG. 3 is a cross-sectional view schematically showing the entanglement device of the embodiment shown in FIG. 1. [Figure 4] FIG. 4 is a longitudinal sectional view schematically showing another embodiment of a device according to the present invention for processing a single multifilament yarn. [Figure 5] FIG. 5 is a view schematically showing another embodiment of a device according to the present invention for processing a plurality of multifilament yarns. [Figure 6] FIG. 6 is a view schematically showing the device shown in FIG. 1, which is disposed behind the drawing device.

Modes for Carrying Out the Invention

[0031] In FIGS. 1, 2 and 3, a first embodiment of a device 100 according to the present invention for processing a single multifilament yarn is shown from a plurality of viewpoints. FIG. 1 shows a longitudinal sectional view, FIG. 2 shows a cross-sectional view of the humidifying device, and FIG. 3 shows a cross-sectional view of the entanglement device. To explain the entire device, first refer to the embodiment shown in FIG. 1.

[0032] In the embodiment shown in Figure 1 of the apparatus 100 according to the present invention for processing a single multifilament yarn, a humidifier 1 and an entanglement device 2 are arranged in the yarn path of the yarn 3, spaced apart from each other and facing each other. The humidifier 1 has an inlet 5.1 on one end face and an outlet 5.2 on the opposite end face. Correspondingly, the entanglement device 2 has an inlet 10.1 and an outlet 10.2. The inlet 10.1 of the entanglement device 2 and the outlet 5.2 of the humidifier 1 are located opposite each other and spaced apart from each other. In Figure 1, this spacing is indicated by the symbol A.

[0033] To explain the humidification device 1, we will also refer to Figure 2 in addition to Figure 1. In this regard, the following explanation applies to both Figure 1 and Figure 2.

[0034] The humidifier 1 has a humidification 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 at the bottom 4.1 of the humidification 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, the tank 8.2 containing a liquid for wetting the yarn 3. At the bottom 4.1 of the groove, a contact surface 4.2 extends between the outlet 5.2 and the fluid passage 7. In this embodiment, the contact surface 4.2 has a length indicated by the symbol L. The typical length of the contact surface 4.2 is at least 20 mm. The humidifier 1 is movably held on a support 6, thereby allowing the spacing A to be changed. In this case, the humidifier 1 can be fixed in position on the support 6 at any position.

[0035] To illustrate the entanglement device 2, we will refer to Figures 1 and 3. In this regard, the following explanation applies to both figures.

[0036] The entanglement device 2 has a thread passage 9 extending between an inlet 10.1 and an outlet 10.2. Corresponding to the thread passage 9, a lateral thread-through slit 11 is provided, which extends along the long side of the entanglement device 2 and allows thread to be inserted into the thread passage 9. An air passage 12 is provided in the intermediate region of the entanglement device 2, formed laterally to the thread passage 9. The air passage 12 opens into the thread 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 thread passage 9 at an inclination in the direction of thread travel.

[0037] Now, in order to explain the function of this embodiment, we will refer only to Figure 1.

[0038] During operation, a liquid, such as an aqueous solution, is supplied to the humidifier 1 via a fluid source 8 into the fluid passage 7. The liquid travels through the fluid passage 7 to the bottom 4.1 of the humidification groove 4. The continuously moving yarn 3 drags the liquid along the contact surface 4.2, thereby absorbing the liquid. In this case, the distribution of liquid into the multifilament yarn is facilitated by the entanglement of the yarn and by vibration and twisting phenomena that spread in the opposite direction to the yarn's direction of travel.

[0039] For entanglement, compressed air is introduced into the yarn passage 9 via the air passage 12 in the entanglement device 2. The compressed air is supplied to the air passage at a predetermined operating pressure in the range of 2 to 5 bar via the compressed air source 13 and the control valve 14. Depending on the operating pressure, the yarn 3 is entangled within the yarn passage. This creates vibrations and twisting forces within the yarn that propagate in the opposite direction to the yarn's direction of travel. These dynamic forces and vibrations within the yarn are schematically shown in Figure 1 by the dashed yarn path. In other respects, the yarn 3 is illustrated together with the non-operating entanglement device 2.

[0040] In order for vibrations to be absorbed by the humidification groove 4 of the humidification device 1 and used to distribute liquid to the yarn 3, the gap A between the outlet 5.2 of the humidification device 1 and the inlet 10.1 of the entanglement device 2 must be maintained. Depending on the operating pressure of the entanglement device 2, this gap is in the range of 50 mm to a maximum of 1000 mm. During actual use, vibrations in the yarn can be perceived by the operator, so the gap A can be adjusted according to the operating pressure of the entanglement device 2.

[0041] In the embodiment shown in Figure 1, the yarn 3 is guided non-contact between the humidifier 1 and the entanglement device 2 within a linear yarn path. However, it is also possible to arrange one yarn guide each corresponding to the inlet 10.1 and outlet 10.2 for yarn guidance within the entanglement device 2. In this regard, Figure 4 schematically shows in a longitudinal section view one other embodiment of the apparatus according to the present invention for processing at least one multifilament yarn. The embodiment shown in Figure 4 is substantially identical to the embodiment shown in Figure 1, so only the differences will be described here, and other points should be referred to the description above.

[0042] In the embodiment shown in Figure 4, a thread guide 15.1 is positioned between the outlet 5.2 of the humidifier 1 and the inlet 10.1 of the entanglement device 2. A second thread guide 15.2 is positioned on the outlet side opposite the entanglement device 2. As a result, the thread 3 is guided by one thread guide 15.1, 15.2 upstream of the inlet 10.1 of the entanglement device 2 and one thread guide 15.2 downstream of the outlet 10.2 of the entanglement device 2. In the thread guide 15.1 between the humidifier 1 and the entanglement device 2, the thread is guided with a relatively small winding angle. The winding angle is schematically illustrated in Figure 4 and is indicated by the symbol a. The winding angle a has a maximum value of 10°, which does not hinder feedback of vibrations passing through and within the thread 3. Such a small winding angle a, within the range of 0 to a maximum of 10°, ensures the transmission of vibrations that recede within the thread 3, depending on the size of the gap.

[0043] Therefore, since the function of the embodiment of the apparatus according to the present invention shown in Figure 4 is the same as that of the embodiment shown in Figure 1, please refer to the above description to avoid repetition.

[0044] In the melt spinning process, it is common to spin, draw, and wind multiple yarns simultaneously as a single yarn group within a spinning station. In this regard, Figure 5 shows another embodiment of the apparatus according to the present invention for processing multiple multifilament yarns. Figure 5 shows a schematic diagram of this embodiment. In this case, a humidifier 1 and an entanglement device 2 are shown, arranged sequentially in the yarn path. The humidifier 1 has multiple humidification grooves 4. Within the entanglement device 2, multiple yarn passages 9 are arranged, each corresponding to a different humidification groove 4. Each yarn passage 9 has one lateral yarn-passing slit 11, which allows yarn to be introduced into the yarn passage 9 at the start of the process. In this case, the configuration of the humidification grooves 4 in the humidifier 1 and the configuration of the yarn passages 9 in the entanglement device 2 are the same as in the embodiment described above. The connection of the humidification grooves 4 to the fluid source is not shown in detail here. Basically, liquid can be supplied simultaneously to all humidification grooves 4 from a single central supply passage. However, it is also possible to supply individually regulated amounts of fluid to each humidification channel.

[0045] In the entanglement device 2, compressed air is preferably supplied to multiple air passages (not shown here) via a single common compressed air connection, thereby causing entanglement of the threads 3 within each thread passage 9.

[0046] In the embodiment shown in Figure 5, since the humidifier 1 and the entanglement device 2 are fixedly positioned, the distance A between the outlet side 16 of the humidifier 1 and the inlet side 17 of the entanglement device 2 is fixedly set. In this case, no adjustment means is provided.

[0047] In the embodiments shown in Figures 1 and 4 above, the humidifier 1 is movably held on the support 6 to adjust the spacing A. However, it is also possible to essentially alternatively form the entanglement device 2 in a displaceable manner on the support. That is, the humidifier 1 may be formed in a stationary position and the entanglement device 2 may be formed in a movable manner. However, in yet another alternative configuration, both devices are formed in a displaceable manner.

[0048] Additionally, in the embodiments shown in Figures 1 and 4, the humidifier 1 provided on the support 6 may be detachably formed. Such a configuration of the apparatus according to the present invention is preferably used to allow a wide variety of processes to be utilized for manufacturing multifilament yarn.

[0049] To ensure that as many uniformly distributed entanglement nodes as possible are generated within the yarn, the yarn is humidified by a water-based liquid humidifier.

[0050] Finally, Figure 6 shows the apparatus shown in Figure 1, retrofitted to the stretching apparatus 200. In this embodiment, the stretching apparatus 200 is schematically represented by a plurality of godets 201, 202, 203, and 204. In this case, the number and arrangement of godets 201, 202, 203, and 204 can be changed according to the melt spinning method at the time, and godets 201, 202, 203, and 204 may be formed in a heated or unheated manner. Godets 201, 202, 203, and 204 may be operated at different rotational speeds, for example, to reach the stretching zone between godets 202 and 203. The stretching apparatus 200 shown in Figure 6 is an FDY stretching area, which may be retrofitted to a melt spinning apparatus, for example, not shown here.

Claims

1. An apparatus for processing at least one multifilament yarn, comprising a humidifying device (1) for applying liquid to the yarn and an entanglement device (2) for forming entanglement nodes in the humidified yarn, wherein the humidifying device (1) and the entanglement device (2) are arranged in succession within the yarn path, The apparatus is characterized in that the distance (A) between the outlet (5.2) of the humidifying device (1) and the inlet (10.1) of the entanglement device (2) is selected such that vibrations caused by entanglement act on the yarn (3) in the humidifying groove (4) of the humidifying device (1), the apparatus is located behind a stretching device for stretching the multifilament yarn, and the stretching device has at least two godets.

2. The apparatus according to claim 1, wherein the distance (A) between the outlet (5.2) of the humidifier (1) and the inlet (10.1) of the entanglement device (2) is in the range of 50 mm to 1000 mm depending on the operating pressure of the entanglement device (2).

3. The apparatus according to claim 1 or 2, wherein the distance (A) between the outlet (5.2) of the humidifier (1) and the inlet (10.1) of the entanglement device (2) is formed to be adjustable by the movement of the humidifier (1) and / or the movement of the entanglement device (2).

4. The apparatus according to claim 1, wherein a thread guide (15.1) is positioned between the outlet (5.2) of the humidifying device (1) and the inlet (10.1) of the entanglement device (2), and the thread guide (15.1) can guide the thread (3) at a winding angle (a) in the range of 0° to 10°.

5. The apparatus according to claim 1, wherein the humidifying groove (4) of the humidifying device (1) has a contact surface (4.2) having a length of at least 20 mm at the bottom of the groove (4.1).

6. The apparatus according to claim 5, wherein the humidifying groove (4) of the humidifying device (1) has a fluid passage (7) that can be connected to a fluid source (8) located in front of the contact surface (4.2) when viewed in the direction of thread travel within the groove bottom (4.1).

7. The apparatus according to claim 1, wherein the humidifying device (1) is detachably held by a support (6).

8. The apparatus according to claim 1, wherein the entanglement device (2) has a thread passage (9) that aligns with the humidification groove (4) of the humidification device (1).

9. The apparatus according to claim 8, wherein the entanglement device (2) has an air passage (12) that opens laterally into the thread passage (9), and the air passage (12) is connectable to a compressed air source (13).

10. The apparatus according to claim 1, wherein the humidifying device (1) has a plurality of humidifying grooves (4) formed in parallel to each other, and the entanglement device (2) has a guide passage (9) corresponding to each of the humidifying grooves (4).

11. The apparatus according to claim 1, wherein the entanglement device (2) is formed as an entangle nozzle.

12. The apparatus according to claim 1, wherein the humidifying device (1) and the entanglement device (2) are formed as an integrated component group.

13. An apparatus for processing at least one multifilament yarn, comprising a humidifying device (1) for applying liquid to the yarn and an entanglement device (2) for forming entanglement nodes in the humidified yarn, wherein the humidifying device (1) and the entanglement device (2) are arranged in succession within the yarn path, The apparatus is characterized in that the distance (A) between the outlet (5.2) of the humidifying device (1) and the inlet (10.1) of the entanglement device (2) is within the range of 50 mm to 250 mm, the humidifying device (1) has a humidifying groove (4), the device is located behind a stretching device for stretching the multifilament yarn, and the stretching device has at least two godets.

14. A method for processing a single multifilament yarn, wherein a drawing apparatus having at least two godets is used to humidify the fully drawn yarn (FDY) with a humidifying device, and the yarn is then guided in a yarn path by a entanglement device that forms entanglement nodes in the humidified yarn, the distance between the outlet of the humidifying device and the inlet of the entanglement device is selected such that the vibrations generated in the yarn by the entanglement device cause at least partial lateral displacement of the portion of the yarn located in the humidifying groove of the humidifying device, and / or the distance between the outlet of the humidifying device and the inlet of the entanglement device is within the range of 50 mm to 250 mm, and the humidifying device has a humidifying groove.

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