Gravity slide with volumetric backflow generator for guiding synthetic filaments

Abstract

The invention relates to a gravity slide with a volume backflow generator for guiding a synthetic filament, the gravity slide (4) having a guide region (43) for guiding the synthetic filament (F) in a filament running direction (FR) and a volume flow region (44) for guiding a volume flow (V1, V2, V3) in a volume flow direction (VR), the volume flow (V1, V2, V3) being able to be formed by means of the volume backflow generator (3), the volume flow direction (VR) in the gravity slide extending counter to the filament running direction (FR), the guide length (L) of the gravity slide (4) for guiding the volume flow (V1, V2, V3) and / or the diameter (D1, D2, D3) of the gravity slide (4) being able to be feedback-controlled in order to adjust a volume flow rate (VG) of the volume flow, and to a related melt spinning plant (1) having the gravity slide (4), and to a method for cooling a filament using the gravity slide (4).

Description

Technical Field

[0001] This invention relates to an adjustable gravity slide with a volume countercurrent generator for guiding synthetic filaments, to a melt spinning apparatus with the gravity slide for producing synthetic filaments, and to a method for cooling filaments using the gravity slide. Background Technology

[0002] WO03056074A1 discloses a gravity slide with segments that can be displaced internally, or a tubular gravity slide, the length of which can be adjusted by a designated actuator. Cooling air is guided in the gravity slide along the filament travel direction. The gravity slide is adjustable to accommodate the corresponding type of yarn to be produced.

[0003] The length of the gravity slide cannot be changed during the production of a predetermined type of yarn. Production must be interrupted, and the length of the gravity slide must be readjusted. The length of the gravity slide cannot be changed during production; it can only be adjusted before production based on conditions. Furthermore, cooling air is guided along the filament travel direction within the gravity slide.

[0004] To ensure adequate cooling, cooling air must be supplied at a high flow rate in the direction of filament travel. The flow rate of the cooling air should be greater than the rate at which the filament is conveyed in the cooling duct.

[0005] To achieve this, the cooling air must be accelerated to a suitable flow rate, which is associated with high energy consumption and high energy costs. Summary of the Invention

[0006] Therefore, the object of the present invention is to provide a gravity slide that can cool filaments at low cost and also allows for feedback control of cooling during filament production.

[0007] Another object of the present invention is to provide a melt spinning apparatus that can cool filaments at low cost and also allows for feedback control of cooling during filament production.

[0008] Another object of the present invention is to provide a method that can cool filaments at low cost and also allows for feedback control of cooling during filament production.

[0009] In the case of gravity slides, according to the present invention, this objective is achieved by a gravity slide having the features described in the first aspect.

[0010] According to one aspect of the invention, a gravity slide with a volume counterflow generator is provided for guiding synthetic filaments, wherein the gravity slide has a guide region for guiding the synthetic filaments along the filament travel direction and a volume flow region for guiding the volume flow along the volume flow direction, wherein the volume flow can be formed by means of the volume counterflow generator, wherein the volume flow direction in the gravity slide extends in the opposite direction to the filament travel direction, and the guide length and / or diameter of the gravity slide for guiding and regulating the volume flow can be feedback controlled to regulate the volume flow rate.

[0011] Gravity guides are used to guide synthetic filaments produced by melt spinning equipment to a winding device. The winding device winds the synthetic filaments onto a tube for downstream processing.

[0012] The gravity slide can be configured to cool the filament. The gravity slide has a guide zone for guiding the synthetic filament to the winding device, and a volume flow zone for guiding the volume flow, wherein the corresponding volume flow flows away from the winding device in the opposite direction to the filament travel direction.

[0013] In particular, according to the invention, the gravity slide guides a volumetric flow opposite to the direction of filament travel. Countercurrent cooling, opposite to the direction of filament travel, can cool the filament more economically and effectively.

[0014] A volume counterflow generator is provided to generate a volume counterflow. This counterflow generator is located at a suitable position on the gravity slide and ensures the formation of a volume flow opposite to the direction of filament travel by blowing or sucking at a predetermined volume flow junction on the gravity slide.

[0015] The direction of filament travel is the direction in which the synthetic filament is guided from the spinneret to the winding device.

[0016] According to one design embodiment of a gravity slide, the adjustment of the guide length and / or diameter of the gravity slide can be controlled by feedback based on a determined temperature, a determined air humidity, a determined volumetric flow, and / or a determined pressure, wherein the temperature, air humidity, volumetric flow, and / or pressure are determined by means of sensors located at predetermined positions in or on the gravity slide, wherein an actuator acts on the predetermined positions of the gravity slide such that the length and / or diameter of the gravity slide are adjustable.

[0017] Furthermore, the gravity slide's construction allows for adjustable guide length, and in particular, feedback control. In this feedback control, data acquired during synthetic filament production is detected and set to a predetermined optimal value, enabling the guide length to be adjusted so that the gravity slide and countercurrent generator provide optimal cooling for the filament even when environmental conditions change at the locations of the winding and melt spinning equipment.

[0018] The cooling temperature in the gravity slide can also be adjusted by changing the guide length of the gravity slide.

[0019] The gravity chute according to the invention is designed so that relevant data can be recorded by means of sensors. The data is evaluated, and the gravity chute is controlled by feedback regarding its guide length and / or its diameter, so that a predetermined volumetric flow with a predetermined cooling effect can be maintained, or it can be adapted to new parameters. This is done during filament extrusion, so that the guide length of the gravity chute and the temperature within the gravity chute can also be controlled by feedback during extrusion. The temperature within the gravity chute is also controlled by feedback through the guide length of the gravity chute. For this purpose, suitable sensors are provided at appropriate locations.

[0020] An actuator is provided that can change the guide length and / or diameter of the gravity slide in order to adjust the gravity slide automatically, in particular.

[0021] For example, the ambient temperature may rise and / or fall. Without any change in the cooling effect of the gravity slide, this could lead to poor quality of the synthetic filaments.

[0022] Using the gravity slide according to the invention, the guide length and, if necessary, the diameter of the gravity slide can be changed by associated sensors, thereby maintaining and / or improving proper cooling.

[0023] The cooling effect of volumetric flow can be altered, in particular, by adjusting the length of the gravity slide. Furthermore, the volumetric flow rate can be changed by adjusting the diameter of the gravity slide accordingly.

[0024] To change the diameter of the gravity slide, gravity slide sections with different diameters can be configured to overlap and displace within each other. The gravity slide can also be a corrugated pipe with tubular walls, the diameter of which and its guide length can be changed by an actuator.

[0025] Pneumatic, hydraulic, or electric actuators can be installed, which can, for example, adjust the guide length of the gravity slide by raising or lowering the gravity slide section. These gravity slide sections can also be configured to rotate relative to each other, so that the guide length of the gravity slide can be adjusted via a gear mechanism.

[0026] The actuator can be located at the connection point of the gravity slide section, so that the gravity slide section can be rotated in or out via a gear mechanism through the assigned drive device.

[0027] In addition, the corresponding lifting device can be applied to the gravity slide section, thereby allowing the gravity slide section to be raised and lowered, so that the guide length can be adjusted to a suitable length.

[0028] According to another design embodiment of the gravity slide, the cooling section can be set by the adjustable guide length of the gravity slide, wherein the cooling effect of the cooling section is enhanced as the guide length increases, and / or wherein the volume flow rate of the volume flow can be set by adjusting the diameter of the gravity slide, wherein the volume flow rate increases as the diameter of the gravity slide decreases.

[0029] The guide length and / or diameter of the gravity slide can be adjusted using the gravity slide according to the present invention.

[0030] The cooling effect of volumetric flow can be adjusted, in particular, by changing the guide length. The volumetric flow rate, and therefore the cooling effect of volumetric flow, can also be adjusted by changing the diameter.

[0031] When the diameter is small, for example, when the volumetric flow rate is the same, the volumetric flow has a higher volumetric flow rate than when the gravity slide section has a larger diameter.

[0032] According to another design embodiment of the gravity slide of the present invention, the gravity slide has a first gravity slide section with an inlet and an outlet, a second gravity slide section with an inlet and an outlet, and / or a third gravity slide section with an inlet and an outlet, wherein each gravity slide section is capable of being extended and / or shortened in a corrugated manner, and / or these gravity slide sections are interlocked together, wherein a first and / or second volume flow junction point leading to a counterflow discharge area, particularly leading to a volume counterflow generator, is formed at the inlet of the first gravity slide section, the second gravity slide section, and / or the third gravity slide section.

[0033] The gravity slide can have interconnected, nested gravity slide segments. Because these gravity slide segments are nested, each gravity slide segment also has a corresponding diameter.

[0034] By using a nested arrangement of gravity slide sections, the guide length and diameter of the gravity slide can be adjusted.

[0035] Additionally and / or optionally, the gravity slide can be formed from a corrugated gravity slide section, such that the gravity slide section itself is designed to be movable, and the length of the corrugated section can be shortened and / or lengthened through the corrugation.

[0036] Corrugated pipe sections can move within each other through nested corrugated pipe sections.

[0037] A counterflow discharge zone is understood as a region through which a volumetric flow is formed to generate a counterflow. This counterflow discharge zone may have piping for guiding the counterflow and an associated volumetric counterflow generator.

[0038] In addition, a volume flow junction can be provided at a predetermined location at the inlet and / or outlet, for example in the form of a pipe or tube, by means of which a volume flow counterflow generator is connected to form a corresponding volume flow in the gravity slide.

[0039] In a simple manner and / or optionally, the volumetric backflow generator can also be connected to the middle area of ​​the gravity slide.

[0040] According to a particularly preferred design embodiment of the gravity slide, the volumetric flow is generated by means of a first volumetric counterflow generator disposed near the inlet of the first gravity slide section, and / or the second volumetric flow is generated by means of a first volumetric counterflow generator and / or a second volumetric counterflow generator disposed near the inlet of the second gravity slide section, wherein the volumetric flow can be generated by means of suction and / or by means of blowing.

[0041] The volumetric flow used to cool the filaments is countercurrent cooling. Countercurrent cooling, or the associated volumetric flow, is generated by a volumetric countercurrent generator. The countercurrent generator is preferably located at the associated volumetric flow junction. Multiple volumetric flow junctions can be provided in the gravity chute.

[0042] The volumetric flow junction can be located between the gravity slide and the spinning box. Alternatively, the volumetric countercurrent generator can also be located in the middle region of the gravity slide and / or optionally also on the cooling unit at the end of the gravity slide.

[0043] By adjusting the position of the counterflow generator, the cooling effect of the volumetric flow it generates can be influenced and altered, thereby enabling the optimal cooling of the filament to be consistently set.

[0044] According to another preferred design embodiment of the gravity slide, the gravity slide has impermeable walls and / or breathable walls that are interconnected in a nested manner, and / or has tubular walls that can be extended and / or shortened in a corrugated manner.

[0045] The gravity slide has gravity slide sections with walls of different designs. For example, the walls can be airtight, especially when the gravity slide sections are interconnected in a nested manner.

[0046] The area of ​​the gravity slide section can also be permeable and have corresponding ventilation slots, through which additional volumetric flow can be drawn in and / or introduced.

[0047] Alternatively or additionally, the walls of the gravity slide section can also be tubular, wherein the length of the tubular wall can be shortened or lengthened in a corrugated manner.

[0048] For example, interlocking gravity slide sections can be replaced by tubular walls.

[0049] In the case of melt spinning equipment, according to the present invention, this objective is achieved by a gravity slide having the features described in the eighth invention.

[0050] According to another aspect of the invention, a melt spinning apparatus for producing synthetic filaments is provided, having a spinning box for extruding synthetic filaments and an extrusion chamber for extruding synthetic filaments, wherein the extrusion chamber is located between the spinning box and a gravity chute for guiding the synthetic filaments, at least one of the aforementioned design embodiments, wherein the guide length, diameter and / or volume flow conveyed by the gravity chute can be adjusted by means of the gravity chute.

[0051] This gravity chute is associated with melt spinning equipment used to produce synthetic filaments. It allows for better cooling, particularly through counter-current flow.

[0052] Furthermore, the cooling effect can be adjusted by changing the guide length, diameter, and / or volumetric flow rate. Appropriate sensors and feedback control are incorporated in this regard. The melt spinning equipment controller can also participate, adjusting open-loop or closed-loop control based on the proposed parameters.

[0053] This adjustment specifically involves the guide length of the gravity slide, the diameter of the gravity slide, and / or the volumetric flow delivered into the gravity slide.

[0054] Appropriate sensors for determining the necessary parameters are set in and on the gravity slide.

[0055] According to the present invention, this objective is achieved by a method having the features described in the ninth aspect.

[0056] According to another aspect of the invention, a method for cooling filaments in a melt spinning apparatus according to the foregoing design embodiment is provided, wherein the cooling of the filaments is controlled by feedback via an adjustable guide length and / or adjustable diameter of at least one gravity slide according to the foregoing design embodiment, wherein the adjustment of the guide length and / or diameter of the gravity slide is determined by means of acquired sensor data, and wherein the volume flow guided in the gravity slide is guided in a volume flow direction extending in the gravity slide in a direction opposite to the filament travel direction in which the filament is guided to the winding device.

[0057] Using this method, simple cooling can be achieved by means of the gravity slide according to the invention, wherein cost-effective cooling is mainly generated by counter-current cooling.

[0058] Furthermore, even during filament extrusion, cooling can be influenced and adjusted at any time, enabling high-quality closed-loop and open-loop cooling control, which requires relatively simple methods and hardware steps.

[0059] According to another design embodiment of the method, the adjustment of the guide length and / or diameter is performed during filament extrusion, wherein the length and / or diameter of the gravity slide is adjusted by means of an actuator acting on the gravity slide, wherein the temperature in the gravity slide is feedback controlled by adjusting the guide length.

[0060] A particular advantage of this equipment or method is that the guide length and / or diameter of the gravity chute can be specifically adjusted even during filament extrusion without causing a decrease in filament quality; on the contrary, it can improve filament quality. Furthermore, it allows for immediate response to changes in the environment of the melt spinning or winding equipment, even during the extrusion and winding processes.

[0061] The gravity slide, the melt spinning apparatus with the gravity slide, and the related methods according to the invention will be explained in more detail below with the aid of several exemplary embodiments of the gravity slide and melt spinning apparatus according to the invention, and with reference to the accompanying drawings.

[0062] The temperature in the gravity slide can also be changed by adjusting the guide length.

[0063] By extending or shortening the guide length, lower or higher temperatures can be induced in the gravity slide. Attached Figure Description

[0064] In the picture:

[0065] Figure 1 A schematic cross-sectional view of a first exemplary embodiment of the gravity slide according to the present invention is shown;

[0066] Figure 2 A cross-sectional view schematically illustrating a second exemplary embodiment of the gravity slide according to the present invention is shown;

[0067] Figure 3 A cross-sectional view schematically illustrating a third exemplary embodiment of the gravity slide according to the present invention is shown;

[0068] Figure 4 A cross-sectional view schematically illustrating a fourth exemplary embodiment of the gravity slide according to the present invention is shown;

[0069] Figure 5 A cross-sectional view schematically illustrating a fifth exemplary embodiment of the gravity slide according to the present invention is shown;

[0070] Figure 6 A schematic cross-sectional view of a sixth exemplary embodiment of a gravity slide according to the present invention is shown;

[0071] Figure 7 A cross-sectional view schematically illustrating a seventh exemplary embodiment of a gravity slide according to the present invention is shown.

[0072] Figure 8 A schematic cross-sectional view of an eighth exemplary embodiment of a gravity slide according to the present invention is shown; and

[0073] Figure 9 A cross-sectional view schematically illustrating a ninth exemplary embodiment of a gravity slide according to the present invention is shown.

[0074] List of reference numerals in the attached diagram:

[0075] 1. Melt spinning equipment

[0076] 10 First bellows

[0077] 12 Second Corrugated Pipe

[0078] 14 tubular wall

[0079] 2 Spinning box

[0080] 20 spinnerets

[0081] 21 Spinning Assembly

[0082] 3. Volumetric counterflow generator / counterflow cooling

[0083] 3.1 First Volume Counterflow Generator

[0084] 3.2 Second Volume Countercurrent Generator

[0085] 30 First volumetric flow junction

[0086] 31 Second volume flow junction

[0087] 32 Third volumetric flow junction

[0088] 33 Fourth volumetric flow junction

[0089] 4 Gravity Slide

[0090] 40 First Gravity Slide Section

[0091] 41 Second Gravity Slide Section

[0092] 43 Guide Area

[0093] 44 Volumetric Flow Region

[0094] 45 Entrance

[0095] 46 Exports

[0096] 47 Third / nth gravity slide section

[0097] 48. Impermeable wall

[0098] 49. Breathable wall

[0099] 5. Extrusion Chamber

[0100] 50 First Countercurrent Discharge Zone

[0101] 51 Second Countercurrent Discharge Zone

[0102] 8 sensors

[0103] 80 First Sensor

[0104] 81 Second Sensor

[0105] 82 Third Sensor

[0106] 9 Actuators

[0107] F filament

[0108] FR Filament travel direction

[0109] VR volume flow direction

[0110] V1 First Volume Flow

[0111] V2 Second Volume Flow

[0112] VG1 First volumetric flow rate

[0113] VG2 Second Volumetric Flow Rate

[0114] VG3 Third Volumetric Flow Rate

[0115] D diameter

[0116] D1 First Diameter

[0117] D2 Second Diameter

[0118] D3 third diameter

[0119] L Guide length Detailed Implementation

[0120] Figures 1 to 9 A common feature of all the gravity slides 4 shown according to the invention is that each gravity slide 4 has a guide region 43 for guiding the synthetic filament F, and a volume flow region 44 for guiding the volume flow V1, V2, wherein each volume flow V1, V2 flows in the opposite direction to the filament travel direction FR, hereinafter also referred to as counterflow or counterflow cooling.

[0121] The guide length L can be set and controlled by the gravity slide 4, allowing appropriate cooling to be adjusted via the guide length L. This guide length L can also be used to set the cooling level, so that the temperature, especially the cooling temperature, can be adjusted using the guide length L of the gravity slide 4.

[0122] With the aid of the gravity slide 4 according to the invention, a gentler and more feedback-controllable cooling process can be achieved. The temperature setting is feedback-controllable via the guide length L. Because better and longer cooling can be achieved using the gravity slide 4 according to the invention, the filament F exhibits greater elasticity and plastic deformation capacity. The gentler cooling is due to counter-current cooling, in particular. Counter-current cooling is achieved by guiding the volumetric flows V1, V2 of cooling air in the opposite direction to the filament travel direction FR. Due to the greater elasticity and plastic deformation capacity, the filament F cooled by counter-current cooling can be wound faster compared to filament F cooled in co-current flow.

[0123] In concurrent flow cooling, the volumetric flow of cooling air is guided along the filament travel direction FR.

[0124] The elastic and plastic elongation of filaments are impaired by co-current cooling. Therefore, filaments cooled by co-current cooling are wound more slowly than those cooled by counter-current cooling, for example, to avoid filament breakage.

[0125] Figure 1 A cross-sectional view schematically illustrating a first exemplary embodiment of the gravity slide 4 according to the present invention is shown.

[0126] Figure 1 A schematic cross-sectional view shows a melt spinning apparatus 1 with a spinning housing having an extrusion chamber 5 adjacent to a gravity chute 4 according to the invention. A first countercurrent discharge zone 50 is adjacent to the extrusion chamber 5, in which filaments F are extruded and guided to the gravity chute 4 according to the invention. The first countercurrent discharge zone 50 is formed at a first volumetric flow junction 30. A volumetric countercurrent generator 3 is disposed in the countercurrent discharge zone 30.

[0127] The volumetric countercurrent generator 3 at countercurrent discharge zone 50 is shown schematically only here.

[0128] The first volume flow junction 30 is tubular and / or pipe-shaped and connected to a volume flow counterflow generator 3.1 (not shown) that generates the volume flow V1. The volume flow V1 is used to form a counterflow for cooling the filament F in the gravity slide 4. The cooling effect of the volume flow V1 generated by the volume flow counterflow generator 3 can be feedback controlled using the gravity slide 4 according to the invention.

[0129] The feedback control of the cooling effect can be set by adjusting the guide length L of the gravity slide 4 and / or by the diameter D1 or D2 of the gravity slide segments 40, 41 that form the gravity slide 4.

[0130] The longer the guide length L of the gravity slide 4, the more gently the filament F can be cooled. This prevents sudden cooling by using counter-current cooling. Counter-current cooling is introduced through ambient air at a relatively cool temperature and heated by supplying it to the spinning box or the spinneret located thereon. In this process, the ambient air is guided more slowly by the volumetric counter-current generator 3 than when it is guided in a parallel flow in the filament travel direction. This counter-current air supply allows for gentler cooling.

[0131] In parallel-flow cooling, cooling air is supplied directly below the extrusion chamber 5, where the cooling air has a correspondingly larger temperature difference compared to the temperature in the extrusion chamber 5 immediately adjacent to the spinneret 20. This exacerbates the quenching of the filament F. This means that the filament F has lower elastic and plastic final strength, resulting in a slower winding speed of the filament F on a winding device not shown.

[0132] By utilizing the gravity slide 4 and counter-current cooling according to the invention, the filament F can be wound and drawn more quickly, which generally provides a greater amount of winding per unit time and also cools the filament F better. This is achieved through gentler cooling, as the cooling is carried out in the counter-current direction, opposite to the filament travel direction FR. The cooling temperature can also be set using the gravity slide 4 according to the invention.

[0133] exist Figures 1 to 9 In the illustrated embodiment, the spinning box 2 includes a spinning box 2, a spinning assembly 21, and a spinneret 20. The spinning assembly 21 has a filter and a guiding device by means of which the plastic melt is guided to the spinneret 20. The spinneret 20 has a capillary for each filament, which forms a filament F from the plastic melt.

[0134] The extrusion chamber 5 is adjacent to the spinning box 2, and the filament F is extruded in the extrusion chamber 5.

[0135] Adjacent to the extrusion chamber 5, the first volume flow junction 30 or the second volume flow junction 31 is respectively connected to one side (e.g., Figure 1 (as shown) or both sides (such as) Figure 2 (As shown). The first volume counterflow generator 3.1 and the second volume counterflow generator 3.2 are connected through the volume flow junction 31 and the second volume flow junction 32, respectively.

[0136] Volumetric flow V1 or second volumetric flow V2 is generated by volumetric counterflow generators 3, 3.1, and 3.2, respectively. Volumetric flow V1 or V2 acts in the opposite direction to the filament travel direction FR. Therefore, volumetric flows V1 and V2 need to have a lower velocity than the co-current cooling flow. The cooling effect is achieved by having volumetric flow V1 travel in the opposite direction to the filament travel direction FR at a substantially slower speed.

[0137] This enables efficient and effortless cooling of the filament F. The cooling effect, as well as the volumetric flow rates VG1 and VG2, can be adjusted by means of the gravity slide 4 according to the invention, through the guide length L and the diameters of the gravity slide sections 40 and 41.

[0138] exist Figure 1 In the second gravity slide section 41, the volumetric flow rate V2 is less than that in the first gravity slide section 40. The diameter D1 of the first gravity slide section 40 is smaller than the larger diameter D2 of the second gravity slide section 41.

[0139] Gravity slide sections 40 and 41 have airtight walls 48 and are nested together. The guide length F of gravity slide 4 can be changed by an actuator 9 (not shown). Figures 1 to 9 The position of actuator 9 is shown in the figure, but actuator 9 is not shown.

[0140] Actuator 9 can operate between gravity slide sections 40, 41, and 47 (see...) Figures 3 to 5 The lifting device acts on the respective exits 46 of gravity slide sections 40, 41, and 47. For example, gravity slide sections 40, 41, and 47 can be screwed into each other to engage, such that rotation of one of gravity slide sections 40, 41, and 47 causes a change in length, and / or the lifting device acts on gravity slide sections 40, 41, and 47. If necessary, more than two gravity slide sections can be provided. A first gravity slide section 40, a second gravity slide section 41, a third gravity slide section 47, and so on, up to the nth gravity slide section, where n>3.

[0141] For example, the first gravity slide section 40 and the second gravity slide section 41 are connected by an external thread, wherein the external thread is formed in the first gravity slide section 40 and the internal thread is formed in the second gravity slide section 41.

[0142] By screwing them together, the guide length L can be varied according to the thread design, by means of a gear mechanism that causes rotation, for example, on the second gravity slide section 41.

[0143] However, actuator 9, pneumatic and / or hydraulically driven lifting elements with pistons and cylinders can also be used to enable adjustment of the matching guide length L.

[0144] To provide feedback control for the guide length L, sensors 8, 80, 81, and 82 are installed at predetermined positions in the gravity slide 4 and the extrusion chamber and / or the volumetric flow junction.

[0145] Sensor 8 or the first sensor 80, the second sensor 81 and / or the third sensor 82 can, for example, detect temperature, humidity, pressure and / or mainstream volumetric flow V1, V2 or volumetric flow rate VG1, VG2, VG3 in or on the gravity slide 4.

[0146] These data and parameters can be used to provide feedback control of the guide length L of the gravity slide 4, thereby allowing the setting of optimal cooling effect and / or temperature.

[0147] Sensors 8, 80, 81, and 82 can report data to the controller (not shown) of the melt spinning apparatus 1. The controller of the melt spinning apparatus 1 can correspondingly control the actuator 9 of the gravity slide 4 with an appropriate program, thereby setting the optimal guide length L in each case.

[0148] exist Figure 1 In this process, the volumetric flow V1 generated by the counterflow device 3 is basically the same as the volumetric flow V1 introduced at the outlet 46 of the gravity slide 4.

[0149] Reference Figure 2 A first volume flow junction 30 and a second volume flow junction 31 are provided at the extrusion chamber 5. The first volume flow junction 30 and the second volume flow junction 31 may have a common volume counterflow generator 3, or each volume flow junction 30, 31 may have its own counterflow generators 3.1 and 3.2.

[0150] Figure 2 The diagram shows a first countercurrent discharge zone 50 with a first volume countercurrent generator 3.1 and a second countercurrent discharge zone 51 with a second volume countercurrent generator 3.2.

[0151] This allows for more precise control of the volumetric flow rates V1 and V2, resulting in uniform cooling of the filament F on both sides.

[0152] Figure 3 The diagram schematically illustrates a third exemplary embodiment of the gravity slide 4 according to the present invention.

[0153] exist Figure 3 In the exemplary embodiment shown, the gravity slide 3 has gravity slide sections 40, 41, and 47, each having its own diameters D1, D2, and D3.

[0154] Due to the different diameters D1, D2, and D3, different volumetric flow rates VG1, VG2, and VG3 are established in each gravity slide section 40, 41, and 47. The larger the diameter D of the gravity slide 4, the smaller the volumetric flow rate VG1, VG2, or VG3 at the same volumetric flow rate.

[0155] exist Figure 3In the process, diameters D1, D2, and D3 increase from the inlet 45 of the first gravity slide section 40 to the third gravity slide section 47. This means that the volumetric flow rates VG1, VG2, and VG3 increase toward the inlet 45 of the gravity slide 4.

[0156] A fourth exemplary embodiment of the gravity slide 4 according to the present invention is shown in Figure 4 The gravity slide 4 with three gravity slide sections 40, 41, and 47 is also shown here, wherein the diameters D3, D2, and D1 of each gravity slide section 40, 41, and 47 decrease toward the exit 46 of the gravity slide 4.

[0157] This means that the first gravity slide section 40 has the largest diameter D3, while the third gravity slide section has the smallest diameter D1. This means that the volumetric flow rate VG1 is the largest at the outlet 46 of the gravity slide 4 and decreases towards the inlet 45 of the gravity slide.

[0158] Figure 5 A fifth exemplary embodiment of the gravity slide 4 according to the present invention is shown.

[0159] exist Figure 5 In the exemplary embodiment shown, one of the gravity slide sections 40, 41, and 47 is provided with a permeable wall 49. Using this permeable wall 49, ambient air can also flow inward through the ventilation slots on the side of the wall 49, thereby establishing a volumetric flow through the permeable wall 49.

[0160] like Figures 1 to 5 As shown, the diameter D of the gravity slide 4 decreases and / or increases in the filament travel direction FR, and / or is adjustable.

[0161] A sixth exemplary embodiment of the gravity slide 4 according to the present invention is shown in Figure 6 middle.

[0162] The gravity slide 4 here shows two first counterflow generators 3.1 and a second counterflow generator 3.2, which are set at a high offset from each other in the filament travel direction FR, and each of them generates volume flow V1 and V2 in the gravity slide at different positions in the gravity slide 4.

[0163] The first volume counterflow generator 3.1 generates volume flow V1 at the inlet 45 of the first gravity slide section 40, and a second volume counterflow generator 3.2 is provided in the second gravity slide section 41 in the filament travel direction FR, which generates a second volume flow V2.

[0164] Volumetric counterflow generators 3.1 and 3.2 are interconnected via a first volumetric flow junction 31 and a third volumetric flow junction 32, and are connected to the gravity slide 4 according to the invention in the filament travel direction FR. The first counterflow generator 3.1 operates at the first volumetric flow junction 31, and the second counterflow generator 3.2 operates at the second volumetric flow junction 32.

[0165] The diameter D1 of the first gravity slide section 40 increases toward the third gravity slide section 47, which has a diameter D3.

[0166] The first to third gravity slide sections are interconnected in an adjustable manner with lengths L1 or L2, wherein the third volume flow junction 32 is flexibly positioned to compensate for changes in the position of the gravity slide 4.

[0167] In order to adjust the first guide length L1, the first gravity slide section 40 and the second gravity slide section 41 have suitable actuators 9 that can raise and / or lower at least the second gravity slide section 41, and in order to adjust the second guide length L2, the third gravity slide section 47 can be lowered and raised, wherein the suitable actuators 9 must and can raise the entire gravity slide device 4.

[0168] The seventh, eighth, and ninth exemplary embodiments of the gravity slide 4 are shown in Figure 7 , Figure 8 and Figure 9 middle. Figure 7 , Figure 8 and Figure 9 The gravity slide 4 shown has a corrugated or tubular wall 14. The wall 14 is designed in a tubular shape so that the diameter D and guide length L of the gravity slide 4 can be changed by the flexible wall 14.

[0169] In addition, the actuator 9 can also act on the tubular gravity slide 4 to change its diameters D1, D2 and D3 in the filament travel direction FR or in the opposite direction to the filament travel direction FR.

[0170] in particular, Figure 9 An exemplary embodiment has a first bellows 10 and a second bellows 12, which are separated from each other by a third volume flow junction 32 or a fourth volume flow junction 33, so that an additional counterflow generator 3 can be connected and coupled through additional volume flow junctions 32, 33 on the second bellows 12 to provide counterflow and cooling as well as individual feedback control for each gravity slide section 40 and 41.

Claims

1. A gravity chute (4) for guiding synthesized filaments (F), said gravity chute (4) having a volume countercurrent generator (3), wherein, The gravity slide (4) has a guide region (43) for guiding the synthesized filaments (F) along the filament travel direction (FR) and a volume flow region (44) for guiding the volume flow (V1, V2, V3) along the volume flow direction (VR), wherein the volume flow (V1, V2, V3) can be formed by means of the volume counterflow generator (3), wherein the volume flow direction (VR) in the gravity slide extends in the opposite direction to the filament travel direction (FR), and the guide length (L) of the gravity slide (4) for guiding the volume flow (V1, V2, V3) and / or the diameter (D1, D2, D3) of the gravity slide (4) can be feedback controlled to adjust the volume flow rate (VG) of the volume flow.

2. The gravity slide (4) as described in claim 1, characterized in that, The adjustment of the guide length (L) and / or the diameter (D1, D2, D3) of the gravity slide (4) can be based on feedback control of a determined temperature, a determined air humidity, a determined volume flow (V1), and / or a determined pressure, wherein the temperature, the air humidity, the volume flow, and / or the pressure are determined by means of sensors (8, 80, 81, 82) located in or at predetermined positions on the gravity slide (4), wherein an actuator (9) acts on the predetermined positions of the gravity slide (4) such that the length (L, L1, L2) and / or the diameter (D1, D2, D3) of the gravity slide (4) are adjustable.

3. The gravity slide (4) as described in at least one of claims 1 or 2, characterized in that, The cooling section can be set by the adjustable guide length (L) of the gravity slide (4), wherein the cooling effect of the cooling section is enhanced as the guide length (L) increases, and / or wherein the volume flow rate (VG1, VG2, VG3) of the volume flow (V1, V2, V3) can be set by adjusting the diameter (D) of the gravity slide (4), wherein the volume flow rate (VG1, VG2, VG3) increases as the diameter of the gravity slide (4) decreases.

4. The gravity slide (4) as described in at least one of the preceding claims, characterized in that, The diameters (D1, D2, D3) of the gravity slides (4) can be adjusted by means of movable gravity slide segments and / or movable gravity slide segments, wherein each gravity slide segment defines a predetermined diameter (D), wherein the diameters (D1, D2, D3) of each gravity slide segment (40, 41, 47) increase, decrease and / or remain the same in the filament travel direction (FR) and / or are adjustable at each gravity slide segment (40, 41, 47).

5. The gravity slide (4) as described in at least one of the preceding claims, characterized in that, The gravity slide (4) has a first gravity slide section (40) with an inlet (45) and an outlet (46), a second gravity slide section (41) with an inlet (46) and an outlet (46) and / or a third gravity slide section (47) with an inlet (45) and an outlet (46), wherein each gravity slide section is capable of being extended and / or shortened in a corrugated manner, and / or these gravity slide sections are interlocked together, wherein a first volume flow junction (30) and / or a second volume flow junction (31) leading to the counterflow discharge area (50, 51), particularly leading to the volume counterflow generator (3), are formed on the inlet (45) of the first gravity slide section (40), the second gravity slide section (41) and / or the third gravity slide section (47).

6. The gravity slide (4) as described in at least one of the preceding claims, characterized in that, The volume flow (V1) is generated by means of a first volume counterflow generator (3, 3.1) disposed near the inlet (45) of the first gravity slide section (40), and / or the second volume flow (V2) is generated by means of a first volume counterflow generator (3) and / or a second volume counterflow generator (3.2) disposed near the inlet (45) of the second gravity slide section, wherein each volume flow can be generated by means of suction and / or by means of blowing.

7. The gravity slide (4) as described in at least one of the preceding claims, characterized in that, The gravity slide (4) has an impermeable wall (48) and / or a breathable wall (49) that are interconnected in a nested manner, and / or has a tubular wall (14) that can be extended and / or shortened in a corrugated manner.

8. A melt spinning apparatus (1) for producing synthetic filaments, the melt spinning apparatus (1) having a spinning box (2) for extruding the synthetic filaments and an extrusion chamber (5), wherein the synthetic filaments are extruded into the extrusion chamber (5), wherein, The extrusion chamber is located between the spinning box and a gravity slide (4) as described in at least one of claims 1 to 7 for guiding the synthetic filament, wherein the guide length (L), the diameter (D1, D2, D3) and / or the volume flow (V1, V2, V3) transported by the gravity slide (4) can be adjusted by means of the gravity slide (4).

9. A method for cooling filaments from a melt spinning apparatus as described in claim 8, wherein, The cooling of the filament (F) is controlled by means of the adjustable guide length (L) and / or adjustable diameter (D1, D2, D3) of the gravity slide (4) as described in at least one of claims 1 to 7, wherein the adjustment of the guide length (L) and / or the diameter of the gravity slide (4) is determined by means of acquired sensor data, and wherein the volume flow (V1, V2, V3) guided in the gravity slide is guided in the gravity slide (4) in a volume flow direction (VR) that extends in the opposite direction to the filament travel direction (FR) of the filament (F) guided toward the winding device.

10. The method as described in claim 9, characterized in that, The adjustment of the guide length (F) and / or the diameter (D1, D2, D3) is performed during the extrusion of the filament (F), wherein the length (L, L1, L2) and / or diameter (D1, D2, D3) of the gravity slide are adjusted by means of an actuator (9) acting on the gravity slide, wherein the temperature in the gravity slide is feedback controlled by adjusting the guide length (F).

Images