Monomer protection device of melt spinning equipment

Abstract

The invention relates to a monomer protection device for a melt spinning device for extruding a synthetic filament (F), comprising a spinning box (35) in which a spinneret assembly (30) is mounted, which has a die plate (36) for extruding the filament in a spinning space (50) of the spinneret assembly (30), a melt feed mechanism (20) and a depressor feed mechanism (40) being located in the spinning box (35), the melt feed mechanism (20) being arranged in the spinning box (35), and the depressor feed mechanism (40) being arranged in the spinning box (35) in such a way that the melt feed mechanism (20) and the depressor feed mechanism (40) are arranged in the spinning box (35). A melt feeding mechanism (20) for feeding a plastic melt is coupled to the spinneret assembly (30), and an inhibitor feeding mechanism (40) is arranged transversely in the filament running direction (FE) with respect to the outer circumferential surface (24) of the spinneret assembly (30) and upstream of the die plate (36) and the spinning space (50), and to a melt spinning apparatus (3) comprising such a monomer protection device.

Description

Technical Field

[0001] The invention relates to a monomer protection device for melt spinning equipment and melt spinning equipment comprising the monomer protection device. Background Art

[0002] In the production of synthetic yarns, a molten, liquid-aggregate plastic melt is extruded through a spinneret in a melt spinning device to form synthetic filaments. Deposits can occur within the melt spinning device, requiring regular maintenance and cleaning of the melt spinning device.

[0003] Depending on the plastic melt used, the deposits contain monomers, with monomers of PA6.6, especially PA6, being hazardous to health above certain limit values. Furthermore, cleaning components contaminated with PA6 is particularly time-consuming and labor-intensive.

[0004] Therefore, the prior art discloses solutions describing monomer collection and discharge.

[0005] CN113638059A discloses a monomer extraction mechanism and an industrial spinning, drawing, and winding apparatus for bio-based polyamide. The monomer extraction mechanism comprises an extraction body, an extraction assembly, and multiple rectifying and heating plates. The extraction body is provided with a main channel connected to the spinning assembly. A slow cooler below the spinneret sprays superheated steam onto the filaments emerging from the spinning assembly to form hot steam containing the monomer. Each extraction assembly includes an extraction line, a vacuum pump, a compressed air line, and a heating coil.

[0006] WO2016173828A1 discloses a method and apparatus for melt-spinning and cooling multifilament yarns made of polyamide. Multiple filament bundles are spun side by side and cooled individually by a cooling airflow flowing radially from the outside inward. The cooling airflow is generated by a blowing chamber connected to a pressure source. Before cooling the filament bundles, the exhaust gases generated during the spinning process are discharged through an exhaust gas outlet below the spinneret. To this end, the air pressure in the blowing chamber is set so that the exhaust gases surrounding the filament bundles are blown out through the exhaust gas outlet from the inside to the outside.

[0007] DE 10 2015 006 409 A1 discloses an apparatus for melt spinning and cooling a filament group. A monomer discharge device is arranged between the spinneret for extruding the filament group and a radial quenching system to remove volatile components, such as monomers or oligomers degassed from the extruded polymer, from the spinning space. The monomer or oligomer discharge is achieved by a crossflow through the spinning space.

[0008] In the above-mentioned method, the introduction of superheated steam and / or the removal of monomers by suction is carried out below the spinneret. However, this means that not all monomers generated in the production of synthetic yarn are intercepted and collected. Summary of the Invention

[0009] It is therefore an object of the present invention to provide a monomer protection device that can be used for reliable and environmentally friendly monomer collection and removal in the production of synthetic filaments.

[0010] Another object of the present invention is to provide a melt spinning apparatus that allows for reliable and environmentally friendly monomer collection and removal.

[0011] According to the invention, this object is achieved with respect to a single-unit protection device by means of the single-unit protection device.

[0012] One aspect of the present invention provides a monomer protection device for a melt spinning device for extruding synthetic filaments, comprising a spinning box in which a spinneret is installed, the spinneret having a die plate for extruding filaments located in a spinning space, wherein a melt feeding mechanism and an inhibitor feeding mechanism are located in the spinning box, wherein the melt feeding mechanism for feeding plastic melt is connected to the spinneret, and the inhibitor feeding mechanism is arranged transversely relative to the outer peripheral surface of the spinneret along the running direction of the filaments and is located upstream of the die plate and the spinning space.

[0013] A spinning beam is understood to be the housing of a melt spinning system, in which all necessary components of the melt spinning system, such as spin packs, pumps and heat transfer media, are installed and provided.

[0014] The heat transfer medium ensures adequate pre-temperature control of the melt spinning equipment so that the plastic melt does not cool down prematurely.

[0015] In addition, the spinneret is provided with a pipeline for feeding the plastic melt.

[0016] Several filaments are extruded from the plastic melt through a die plate. During extrusion from the die plate, monomers are released. However, monomers may already be present in the spin beam.

[0017] Therefore, it is advantageous to release the inhibitor close to the spin pack in the spin beam.

[0018] The inhibitor can be introduced onto the spin pack at a temperature which corresponds essentially to the temperature of the plastic melt.

[0019] The function of the inhibitor is to prevent the monomers from depositing in the spinning beam and to intercept and / or bind them and direct them to the appropriate location.

[0020] The temperature of the plastic melt may be in the range of 260°C to 320°C, and the temperature of the inhibitor may be in the range of 240°C to 330°C.

[0021] The inhibitor may comprise water and / or nitrogen. The inhibitor is preferably in a gaseous aggregate state when introduced into the spin pack. In this case, the inhibitor cools over time and may condense and reach a vapor aggregate state.

[0022] According to a preferred embodiment, the die plate is connected to a discharge device, through which the feed inhibitor and / or monomer from the inhibitor feed mechanism can be discharged.

[0023] The monomer can be discharged from the melt spinning apparatus and other components of the melt spinning apparatus using a discharge device.

[0024] Furthermore, diffusion of monomers is prevented.The discharge device may be self-cleaning and may be cleaned and / or replaced at regular intervals.

[0025] According to a further preferred embodiment, the discharge device is adjoined by a cooling device, by means of which the extruded filaments can be cooled.

[0026] The cooling unit is responsible for cooling and solidifying the filaments. The monomer protection unit also protects the cooling unit. This prevents blockages in the cooling unit and ensures consistent cooling performance.

[0027] The cooling device may be a radial cooling device and / or a cross-flow cooling device.

[0028] In the case of a radial cooling device, the cooling flow enters the center of the cooling device radially from the outside inwards towards the filaments.

[0029] In the case of a cross-flow cooling device, the cooling flow runs from one side of the cooling device to the other transversely with respect to the yarn running direction.

[0030] According to a particularly preferred embodiment, the discharge device receives a discharge pressure from the inhibitor feed mechanism and / or from the cooling device via the inhibitor feed mechanism and / or via the cooling device, thereby enabling the inhibitor and / or monomer to be discharged through the discharge device.

[0031] The interception and discharge of monomers and sediments is preferably performed passively only by the discharge pressure of the inhibitor feed mechanism and / or the discharge pressure of the cooling air.

[0032] Some of the cooling air is not entrained by the filaments but escapes towards the spinning space, which acts as discharge pressure and is used to discharge the monomer to the monomer collector.

[0033] The additional actively generated suction pressure in the spinning space can have a negative impact on the quality of the yarn.

[0034] According to a preferred embodiment, a clamping groove is formed on the peripheral surface of the spinning pack, into which groove the inhibitor can be introduced through a valve, on the peripheral surface of the spinning pack and at a distance from the die plate.

[0035] The spin pack's clamping groove extends along the outer circumference of the spin pack. Adjacent to the clamping groove is an opening that can be equipped with a valve for feeding an inhibitor to intercept and drain monomers and sediment. The clamping groove is located approximately in the center of the spin pack's outer surface, spaced a distance from the die plate.

[0036] According to a further preferred embodiment, the inhibitor comprises water and / or nitrogen, and / or the temperature of the inhibitor in the spinning beam is substantially lower than, equal to and / or higher than the temperature of the plastic melt.

[0037] Preferably, the inhibitor is a superheated gas that maintains the monomer in at least a liquid aggregate state so that the monomer does not solidify and cool.

[0038] In particular, water and / or nitrogen have proven suitable for this purpose, since both substances are inexpensive and environmentally friendly and are suitable for the steam blanketing function of the spin pack.

[0039] The temperature of the inhibitor can reach the optimal temperature.

[0040] This temperature can be lower than, equal to and / or higher than the temperature of the plastic melt. Important here is that undesirable cooling of the plastic melt is not produced.

[0041] According to a further preferred embodiment, a monomer collector for collecting monomers is provided at the inlet opening of the cooling device.

[0042] In addition to the monomer protection device with steam cover, a monomer collector can also be provided at the cooling device.

[0043] The monomers are intended to settle and accumulate at the monomer collector so that they do not enter the cooling device and clog the latter.

[0044] According to a particularly preferred embodiment, a tube portion for depositing the monomers is provided at the monomer collector, wherein the tube portion at least partially projects at a predetermined distance into a cooling channel of the cooling device and / or the monomer collector can be passively cooled.

[0045] Preferably, the monomer collector may have a tube portion on which the monomers may be deposited.

[0046] If the pipe section extends into the cooling device, the section extending into the cooling device is cooled, which can cause and promote condensation of monomers at the cooled pipe section.

[0047] According to a further preferred embodiment, the monomer collector has a funnel portion and a tube portion, wherein a first height of the funnel portion along the filament running direction is smaller than, equal to, and / or larger than a second height of the tube portion along the filament running direction.

[0048] The monomer collector may have a funnel portion at its inlet opening, which covers the inlet opening area of ​​the cooling device. The funnel portion may be larger, smaller, or equal to the length of the tube portion. Sediments and monomers may also be deposited and accumulated in the funnel portion.

[0049] According to a further preferred embodiment, the discharge device has a feed channel and / or a discharge channel, wherein the discharge is performed passively by feeding the inhibitor from the inhibitor feed mechanism and / or by cooling air of the cooling device and / or actively by feeding the inhibitor which can be fed via the inhibitor feed mechanism.

[0050] Preferably, no active suction removal is performed at the discharge device. Active suction removal would have a negative impact on the filament quality. Therefore, only the flow and flow forces of the inhibitor and / or cooling air present in the spinning space are effective.

[0051] According to a particularly preferred embodiment, the heating device is formed on the discharge device.

[0052] In order to prevent condensation in the region of the discharge device due to excessively rapid cooling, a heating device can be provided there. The heating device can be controlled and / or regulated.

[0053] For example, the heating device can have a heating coil.However, it is also possible to provide a heater which is operated with a heating medium.

[0054] According to the invention, this object is achieved with respect to a melt-spinning device by means of said melt-spinning device.

[0055] Another aspect of the present invention provides a melt spinning device for producing synthetic yarn, comprising a monomer protection device 1 according to at least one of the aforementioned embodiments, wherein the melt spinning device comprises a spinning box 35 having a melt feeding mechanism and an inhibitor feeding mechanism, wherein the inhibitor feeding mechanism is located in the spinning box, and the inhibitor from the inhibitor feeding mechanism can be distributed in the spinning box, and the inhibitor can be brought to an inhibitor temperature that substantially corresponds to the extrusion temperature of the plastic to be extruded. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The cell protection device according to the present invention will be explained in more detail below based on some exemplary embodiments of the cell protection device and with reference to the accompanying drawings.

[0057] In the attached figure:

[0058] Figure 1Schematically shows a detailed cross-sectional view of a melt spinning device with a spinning beam and a cooling device and a monomer protection device according to the invention, which is located in and on the spinning beam,

[0059] Figure 2 An exemplary embodiment of a cell protection device with a heating device is schematically shown.

[0060] Figure 3 Another exemplary embodiment of a monomer protection device having a monomer collector is schematically shown, and

[0061] Figure 4 Another exemplary embodiment of a cell protection device having a cell collector that can be passively cooled is schematically shown.

[0062] Reference Signs List

[0063] 1 Single protection device

[0064] 3 Melt spinning equipment

[0065] 7 valves

[0066] 10 Heating device

[0067] 20 Melt feeding mechanism

[0068] 24 Peripheral surface

[0069] 30 Spinning assembly

[0070] 31 Clamping groove

[0071] 20 Melt feeding mechanism

[0072] 40 Inhibitor feeding mechanism

[0073] 41 Inhibitors

[0074] 42 Covering Space

[0075] 35 Spinning Box

[0076] 36 Die Plate

[0077] 50 Spinning Space

[0078] 60 Cooling device

[0079] 61 Entrance hole

[0080] 62 cooling channels

[0081] 63 sealing sleeve

[0082] 64 filter screen

[0083] 65 air distributor

[0084] 66 Air feeding mechanism

[0085] 70 Discharge Pressure

[0086] 80 discharge device

[0087] 81 Feed channel

[0088] 82 discharge channel

[0089] 84 Monomer Collector

[0090] 90 Cooling air flow

[0091] 100 Monomer Collector

[0092] 101 Department

[0093] 102 Infundibulum

[0094] 110 Throttling device

[0095] 111 outlet sleeve

[0096] 112 heat transfer medium

[0097] 114 heat transfer space

[0098] A Distance

[0099] H Height

[0100] H1 First Height

[0101] H2 Second Height

[0102] F filament

[0103] FV Silk Curtain

[0104] FE filament running direction DETAILED DESCRIPTION

[0105] Figure 1 A schematic cross-sectional view of a melt spinning apparatus 3 for producing synthetic yarns is shown. With the melt spinning apparatus 3, a plurality of filaments F can be produced from a plastic melt fed via a melt feed mechanism 20 via a die plate 36.

[0106] The filaments F are only partially indicated by the dotted lines above the filament curtain FV.

[0107] When the filaments F are sufficiently cooled by the cooling device 60 , the filaments F or the filament curtains FV are gathered together at a convergence point (not shown) to form a thread.

[0108] A sealing sleeve 63 is provided between the cooling device 60 and the spinning beam 35 for fluid-tightly sealing the transition between the cooling device 60 and the spinning beam 35 .

[0109] When PA6 and PA6.6 are produced, monomers are generated which are somewhat detrimental to the production of synthetic filaments F because they are deposited in the melt spinning device 3, in particular in the die plate 36 and the subsequent spinning space 50, and can interfere with or hinder the production and extrusion of the filaments.

[0110] Using melt spinning equipment 3, Figure 1 , a monomer protection device 1 is shown. The monomer protection device 1 can feed the inhibitor 41 to the melt spinning device 3.

[0111] The suppressant 41 may be fed in the form of steam to the outer peripheral surface 24 of the spin pack 30. The suppressant 41 is fed above the die plate 36 in the filament running direction FE of the spin pack 30.

[0112] The inhibitor 41 is fed via the inhibitor feeding mechanism 40 .

[0113] The inhibitor 41 can be fed in a controlled and / or regulated manner via the valve 7 .

[0114] The suppressant 41 is fed into the clamping groove 31 above the die plate 36. In the installed state in the melt spinning device 3, the clamping groove 31 forms, together with the spinning beam 35 of the melt spinning device 3, a covering space 42 which annularly surrounds the spin pack 30 and forms a space through which the vapor blanket of the suppressant 41 can be guided toward the die plate 36 and can be discharged via the discharge device 80.

[0115] The inhibitor 41 can be fed in substantially at the same temperature as the plastic melt, so that no adverse cooling of the melt spinning device 3 occurs in the spinning space 50. The inhibitor 41 can also be fed in by the inhibitor feed mechanism 40 at a lower and / or higher temperature.

[0116] The function of the inhibitor 41 is to prevent the monomer from condensing and depositing on the components of the melt spinning apparatus 3 and to transfer the monomer to at least the monomer collector 84 .

[0117] In other words, the inhibitor 41 is intended to prevent any monomers from being deposited and accumulated in the spinning beam 35, since monomers in a cold state are difficult (if not impossible) to remove from the components of the melt spinning device 3. In this case, this refers specifically to the monomers of PA6 and PA6.6. In particular, PA6 in a cold state cannot be removed without great effort.

[0118] The monomer protection device 1 mainly includes an inhibitor feeding mechanism 40, a cover space 42, and a monomer collector 84. The monomer collector 84 is coupled to the spinning space 50 of the spin pack 30 through the discharge device 80 in a fluid-tight manner.

[0119] The discharge device 80 is coupled to a feed channel 81 corresponding to the spinning space 50 , and is coupled to a discharge channel 82 leading to a monomer collector 84 .

[0120] The monomer collector 84 may have additional lines through which monomer or inhibitor 41 may be discharged.

[0121] On the outer peripheral surface 24 of the spin pack 30 , the clamping groove 31 is spaced apart from the die plate 36 , so that the inhibitor 41 can flow unimpeded through the spinning space 50 toward the monomer collector 84 .

[0122] exist Figure 1 and Figure 2 , the distance between the spin pack 30 and the spinning box 35 is shown exaggerated to illustrate the path of the inhibitor 41 toward the monomer collector 84. In fact, the space between the spin pack 30 and the spinning box 35 shown in the figure is substantially the same above and below the clamping groove 31.

[0123] A heat transfer space 114 having a heat transfer medium 112 for preheating the spinning box 35 is formed in the spinning box 35 .

[0124] Furthermore, the monomer protection device 1 may include a monomer collector 100 that is arranged downstream of the die plate 36 and the spinning space 50 in the filament running direction FE but upstream of the cooling device 60 .

[0125] The monomer collector 100 is disposed at the inlet hole 61 of the cooling device 60. The cooling device 60 forms a cooling channel 62 in which the filaments F run and are acted upon by a radially incident flow of cooling air from outside to inside.

[0126] The cooling device 60 has an air feed mechanism 66, through which cooling air is fed to an air distributor 65. An air-permeable filter grid 64 is provided in the air distributor 65 for homogenizing the fed cooling air and guiding the cooling air radially toward the wire curtain FV.

[0127] The inhibitor 41 or the monomers are discharged passively without corresponding applied pressure. Only the discharge pressure 70 generated by the inhibitor 41 or the cooling air flow 90 of the cooling device ensures that the inhibitor 41 and the monomers transported by the inhibitor 41 are discharged.

[0128] Cooling air flow 90 at Figure 1The cooling air flow 90 runs along the filament running direction FE and is also opposite to the filament running direction FE, as shown in the figure.

[0129] The cooling air flow 90 is uniformed and radially fed to the yarn curtain through the filter grid 64 of the cooling device 60, and part of the cooling air flow 90 is also entrained downward along the yarn running direction FE by the yarn curtain FV. Figure 1 shown.

[0130] Part of the cooling air flow 90 flows toward the spinning space 50 of the die plate 36 in the opposite direction to the filament running direction FE, and flows into the monomer collector 84 through the discharge channel 82, thereby carrying the monomer.

[0131] The discharge pressure 70 generated by the cooling air may be controlled and / or adjusted using the throttling device 110 by increasing and / or decreasing the size of the through opening of the air distributor 65 .

[0132] The filaments F leave the cooling device 60 through an airtight outlet sleeve 111 .

[0133] In addition, the monomer protection device 1 may include a heating device 10, such as Figure 2 shown.

[0134] With the heating device 10 , undesired cooling, in particular in the region of the spinning space 50 , can be avoided, so that less monomer can be deposited there and can be directed towards the monomer collector 84 .

[0135] In addition, if Figure 3 As shown, monomer protection device 1 may include a monomer collector 100 having an extended tube portion 101. Tube portion 101 and monomer collector 100 are replaceable, making it easier to separate monomers deposited therein and to clean monomer collector 100. Tube portion 101 protrudes a predetermined distance A into cooling channel 62 of cooling device 60. Another portion of tube portion 101 is housed within extended sealing sleeve 63.

[0136] Monomer collector 100 may be composed of a material that facilitates the removal of monomer that has hardened and / or deposited therein.

[0137] Figure 3 Also shown is a throttle device 110. By means of the throttle device 110, in this case in the form of a pivotable flap (indicated by a double-headed arrow), the cooling air feed to the cooling device 60 can be controlled and / or regulated.

[0138] The feed of cooling air can be blocked, partially enabled or fully enabled by means of the throttling device 110. The cooling air is also responsible for the discharge pressure 70 towards the monomer collector 84. Therefore, the throttling device 110 can also be used to influence the amount of monomer that is intercepted.

[0139] Figure 4 Another exemplary embodiment of a monomer collector 100 of a monomer protection device 1 is shown.

[0140] The monomer collector 100 protrudes together with the tube portion 101 at a predetermined second height H2 into the cooling channel 62 of the cooling device 60. The further the tube portion 101 extends into the cooling channel 62, the better the cooling air can passively cool the tube portion 101.

[0141] The cooling causes the monomer to condense and deposit at the monomer collector 100. The greater the height H of the monomer collector 100, the greater the area provided for monomer deposition.

[0142] Therefore, it is possible to prevent monomers from clogging the filter grid 64. However, the monomer collector 100 must be cleaned regularly.

Claims

1. A monomer protection device (1) for a melt spinning device (3) for extruding synthetic filaments (F), the monomer protection device (1) comprising a spinning box (35), in which a spinneret (30) is installed, the spinneret (30) having a die plate (36) for extruding the filaments (F) located in a spinning space (50), wherein: A melt feed mechanism (20) and an inhibitor feed mechanism (40) are positioned in a spinning box (35), wherein the melt feed mechanism (20) for feeding a melt of plastic is connected to the spin pack (30), and the inhibitor feed mechanism (40) is arranged transversely relative to the outer peripheral surface (24) of the spin pack (30) in the filament running direction (FE) of the spin pack (30) and is positioned upstream of the die plate (36) and the spinning space (50).

2. The single body protection device (1) according to claim 1, characterized in that: The die plate (36) is adjacent to a discharge device (80), by means of which the feed inhibitor (41) and / or monomer from the inhibitor feed mechanism can be discharged.

3. A single-body protection device (1) according to at least one of the preceding claims 1 or 2, characterized in that The discharge device (80) is adjacent to a cooling device (60), by means of which the extruded filaments (F) can be cooled.

4. Monolithic protection device (1) according to at least one of the preceding claims, characterized in that The discharge device (80) is provided with a discharge pressure (70) from the inhibitor feeding mechanism (40) and / or from the cooling device (60) by means of the inhibitor feeding mechanism and / or by means of the cooling device (60), so that the inhibitor (41) and / or the monomer can be discharged through the discharge device (80).

5. Monolithic protection device (1) according to at least one of the preceding claims, characterized in that A clamping groove (31) is formed on the outer peripheral surface (24) of the spinning assembly (30), and the inhibitor (41) can be introduced into the clamping groove with the help of a valve (7), on the outer peripheral surface (24) of the spinning assembly (30) and at a certain distance from the die head plate (36).

6. Monolithic protection device (1) according to at least one of the preceding claims, characterized in that The inhibitor (41) comprises water and / or nitrogen, and / or the temperature of the inhibitor in the spinning beam is substantially lower than, equal to and / or higher than the temperature of the melt of the plastic.

7. Monolithic protection device (1) according to at least one of the preceding claims, characterized in that A monomer collector (100) for collecting the monomer is provided at the inlet hole (61) of the cooling device (60).

8. Monolithic protection device (1) according to at least one of the preceding claims, characterized in that A tube portion (101) for depositing monomers is provided at the monomer collector (100), wherein the tube portion (101) at least partially extends into a cooling channel (62) of the cooling device (60) at a predetermined distance (A), and / or the monomer collector (100) can be passively cooled.

9. Monolithic protection device (1) according to at least one of the preceding claims, characterized in that The monomer collector (100) comprises a funnel portion (102) and a tube portion (101), wherein a first height (H1) of the funnel portion along a filament running direction (FE) is less than, equal to and / or greater than a second height (H2) of the tube portion (101) along the filament running direction (FE).

10. Monolithic protection device (1) according to at least one of the preceding claims, characterized in that The discharge device (80) has a feed channel (81) and / or a discharge channel (82), wherein the discharge is performed passively by feeding the inhibitor from the inhibitor feed mechanism and / or by cooling air of the cooling device, and / or actively by feeding the inhibitor that can be fed via the inhibitor feed mechanism.

11. Monolithic protection device (1) according to at least one of the preceding claims, characterized in that A heating device (10) is formed on the discharge device (80).

12. A melt spinning device (3) for producing synthetic yarns, comprising a monomer protection device (1) according to at least one of the preceding claims 1 to 11, wherein: The melt spinning device comprises a spinning box (35) having a melt feed mechanism and an inhibitor feed mechanism, wherein the inhibitor feed mechanism is positioned within the spinning box and the inhibitor from the inhibitor feed mechanism can be distributed within the spinning box and can be brought to an inhibitor temperature that substantially corresponds to the extrusion temperature of the plastic to be extruded.

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