Equipment for melt spinning and cooling

Abstract

The utility model relates to equipment for melt spinning and cooling, which comprises an air blast box and a plurality of spinning nozzles, the air blast box is connected to a compressed air source, a cooling cylinder is arranged in an air blast cavity, a plurality of inlet holes are respectively formed on the top side of the air blast box by the cooling cylinder, and the equipment further comprises a connecting joint, the utility model relates to a device for producing an exhaust gas, comprising a draft hood which is held in a pressure-tight manner with respect to the blower box and the spinning box and which has at least one exhaust gas opening for the exhaust gas discharge at the channel for each spinning nozzle, and comprising a suction hood which is connected to a suction device and has a suction opening which is opposite and spaced apart from the exhaust gas opening, and a part between the air inlet and the air outlet is closed and is provided with an air inlet with adjustable opening. Due to the fact that the coarse denier filaments and the fine denier filaments are affected by different degrees of airflow except the cooling airflow, the negative effect of the suction airflow on the coarse denier filaments is weak especially for the coarse denier filaments with high airflow interference resistance, and the suction airflow acting on the filaments can be adjusted to assist in cooling of the filaments and meanwhile generate the negative effect on the filaments as little as possible.

Description

Technical Field

[0001] The utility model relates to a device for melt spinning and cooling. Background Art

[0002] In the manufacture of synthetic yarns, a plurality of filament fibers are cooled in a downstream cooling zone after being extruded from a spinneret in order to solidify the thermoplastic material of the filaments so that a plurality of filaments can be combined into a multifilament yarn. In order to cool the just extruded filaments, a cooling air flow needs to be directed onto the filaments. In order to obtain a strong cooling of the individual filament bundles in the filament bundle in this case, the cooling system disclosed in DE 10 2013 012 869 A1 is useful, in which the cooling air flow of the filaments is input from the outside to the inside.

[0003] Furthermore, in the device disclosed in CN107532335B, considering that the filaments are easily affected by the suction airflow, the device avoids directly applying the suction airflow to the filaments. The air pressure of the cooling airflow in the blast chamber is controlled so that the exhaust gas can be reliably discharged at the exhaust gas outlet, thereby achieving the dual functions of cooling the filaments and discharging the exhaust gas at the same time. The exhaust gas can be discharged without adding an additional negative pressure source.

[0004] For the suction of the exhaust gases, a suction device with a suction hood is provided. The suction opening of the suction hood is at a distance from the exhaust gas outlet, and the suction effect generated at the exhaust gas outlet is used to absorb and remove the exhaust gases floating freely in the external environment, so that the blast airflow generated at the exhaust gas outlet is not affected.

[0005] In the actual production process using such equipment, it is found that the strand length value and long-term stability of coarse denier fibers (such as 1 dpf and above, dpf refers to the single filament fineness) are not ideal. Therefore, it is necessary to improve the existing technology, and the improved equipment needs to be able to adapt to the production of coarse denier fibers and fine denier fibers at the same time, so that when switching between coarse denier fiber production and fine denier fiber production equipment, it is not necessary to spend a lot of cost and time on equipment conversion. Utility Model Content

[0006] In order to provide a melt spinning and cooling device that is beneficial for spinning both coarse denier filaments and fine denier filaments, this patent provides the following technical solution.

[0007] According to one aspect of the present patent, a device for melt spinning and cooling comprises a blast box and a plurality of spinnerets on the bottom side of a spinning box, the blast box being connected to a compressed air source and having a plurality of cooling cylinders comprising air-permeable walls in a blast chamber, the cooling cylinders respectively forming a plurality of inlet holes on the top side of the blast box, the device further comprising a connecting joint, the connecting joint being maintained in a pressure-tight manner relative to the blast box and the spinning box and having at least one exhaust gas opening for exhaust gas discharge at a channel for each spinneret, the blast box being equipped with a pressure regulating mechanism for regulating the air pressure in the blast chamber, by means of which the air pressure for blowing out exhaust gas at the exhaust gas opening of the connecting joint can be adjusted, the exhaust gas opening being communicated with the exhaust gas chamber, the exhaust gas chamber being communicated with the exhaust gas outlet, the device further comprising a suction hood having an air suction opening connected to a suction device, the air suction opening being opposite to and spaced from the exhaust gas outlet, a partially closed air inlet opening being provided between the two and having an adjustable opening.

[0008] The beneficial effect is that, since the coarse denier filaments and the fine denier filaments are affected to different degrees by airflows other than the cooling airflow, the negative effect of the suction airflow is weaker on the coarse denier filaments with strong resistance to airflow interference, and the suction airflow can be used to achieve the effect of auxiliary cooling. The air inlet opening can strengthen or weaken the influence of the suction airflow on the filaments in the cooling cylinder, so the different needs of the coarse denier filaments and the fine denier filaments can be met by the partially closed structure between the suction opening and the exhaust gas outlet and the adjustable air inlet opening connected to the external environment.

[0009] In order to achieve the adjustable air intake opening, according to the second aspect of the present patent, the air intake opening and the exhaust gas outlet are relatively fixed, and the covering part can be slidably arranged in cooperation with the air intake opening, so that the opening of the air intake opening is determined by the position of the covering part.

[0010] As another embodiment of realizing the adjustable air inlet opening, the suction hood having the air inlet opening is configured to be slidable relative to the exhaust gas outlet, and the opening degree of the air inlet opening is determined by the position of the suction hood.

[0011] According to another aspect of the present patent, the air intake opening and the exhaust gas outlet are partially closed by a fixing portion, and the air intake opening is located at the bottom side of the fixing portion.

[0012] Considering that powdered monomers harmful to health may accumulate at the air intake opening and fall on the operator, according to another aspect of the present invention, the cover portion is slidably disposed on the bottom side of the air intake opening and is configured to have a collecting portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1A longitudinal sectional view of the apparatus for melt spinning and cooling of the utility model;

[0014] Figure 2 A cross-sectional view of the first embodiment of the present invention in a first state is schematically shown;

[0015] Figure 3 A cross-sectional view of the first embodiment of the present patent in the second state is schematically shown;

[0016] Figure 4 A cross-sectional view of the second embodiment of the present invention in a first state is schematically shown;

[0017] Figure 5 A cross-sectional view of the second embodiment of the present patent in the second state is schematically shown. DETAILED DESCRIPTION

[0018] The present invention is further described with reference to the following embodiments. It should be understood that the claimed invention is not intended to be limited to these examples in any way.

[0019] Figure 1 It is a longitudinal sectional view of the device for melt spinning and cooling of the utility model.

[0020] The component indicated by the symbol 1 is a spinning box, and its bottom side 12 holds a plurality of spinnerets 2 arranged in a row. The spinnerets 2 are connected to a spinning pump 3 through a plurality of melt pipes 6 in the spinning box 1. The spinning pump 3 is driven by a pump drive mechanism. The spinning pump 3 is connected to a melt source not shown via a melt inlet 5. The spinning box 1 has a heating design, so the spinnerets 2, the melt pipes 6 and the spinning pump 3 are heated.

[0021] The spinning box 1 is provided with a connection 13 on the bottom side 12. The connection 13 has a channel 16 for each spinneret 2, which is connected to the bottom side 12 of the spinning box 1. The connection 13 is supported on a pressure plate 20, which is placed on the bottom side 12 of the spinning box 1. In the exemplary embodiment, the connection 13 is held above the adjacent cooling device 4.

[0022] In this embodiment, the cooling device 4 is formed by a blow box 8, which supports the connecting joint 13 in its top side 11. An upper blow chamber 9 and a lower distribution chamber 10 are formed in the blow box 8, wherein the upper blow chamber 9 and the lower distribution chamber 10 are separated from each other by a perforated plate 26. The blow box 8 has a plurality of cooling cylinders 23 coaxially with the passage 16 of the connecting joint 13. The cooling cylinders 23 form a plurality of inlet openings 15 on the top side 11 of the blow box 8, which are coaxially oriented with the passage 16 of the connecting joint 13. The cooling cylinders 23 are all configured identically in the upper blow chamber 9 and have a gas-permeable cylinder wall, which can be formed, for example, in a double-wall design with an inner perforated plate and an outer wire mesh or metal mesh.

[0023] In the vertical direction, the cooling cylinder 23 is equipped with a plurality of channel cylinders 27, which are open at both ends and have closed cylinder walls and pass through the lower distribution chamber 10. The blast box 8 is then completely passed through by the cooling cylinder 23 and the channel cylinder 27 from the top side to the outlet side.

[0024] The blower box 8 has an air duct 24 on the longitudinal side, which leads to the lower distribution chamber 10. The air duct 24 is connected to a compressed air source, which is not shown in detail here, via an air supply duct 29. A pressure regulating mechanism 30 is provided in the air supply duct 29. In this embodiment, the pressure regulating mechanism 30 is formed by an adjustable throttle flap 31.

[0025] For sealing and insulation, an insulation plate 22 extending between the connecting joint 13 and the bellows box 8 is provided on the top side of the bellows box 8 .

[0026] For the vertical adjustment of the blow box 8, two separate piston-cylinder units 28.1, 28.2 are provided, which are connected directly to the blow box 8 on the outlet side. During operation, the blow box 8 together with the connecting nipple 13 is pressed onto the bottom side 12 of the spinning box 1 or the pressure plate 20, respectively. In a compact design, usually only one of the piston-cylinder units shown is assigned to the blow box 8, which preferably acts in the central area of ​​the blow box 8.

[0027] Each of the spinnerets 2 extrudes a plurality of filaments 7, which pass through a nozzle plate (not shown in detail here) on the bottom side of the spinneret 2 and have a plurality of nozzle openings. The filaments 7 form a filament bundle.

[0028] Figure 2 and Figure 3 The cross-sectional view of the first embodiment of the present invention in different states is schematically shown. The two different states depend on the position of the suction hood.

[0029] During the filament extrusion, unstable components and in particular monomers and oligomers are generated in the nearby spinning space 21, which are dispersed as waste gas in the spinning space 21 and blown out of the spinning space 21 through the waste gas opening 19 by the positive pressure generated by the blow box 8 of the cooling device 4. The waste gas is conveyed into the nearby waste gas chamber 14 through the waste gas opening 19. A plurality of waste gas openings 19 are arranged on the channel 16, which are arranged on a pitch circle and are evenly distributed around the channel 16. In this embodiment, the waste gas openings 19 are formed by holes. In principle, the waste gas openings 19 can also be formed by elliptical or slit-shaped cuts.

[0030] The exhaust gas opening 19 in the passage 16 leads to the exhaust gas chamber 14 in the connecting joint 13. The exhaust gas chamber 14 extends between a closed top side 17 of the connecting joint 13 and a closed bottom side 18 of the connecting joint 13. The exhaust gas chamber 14 is arranged in an annular shape in the connecting joint 13 and surrounds the passage 16. An exhaust gas outlet 37 communicating with the exhaust gas chamber 14 is provided on the connecting joint 13 on the longitudinal side.

[0031] In order to cool the filament bundle, the cooling air flow generated by the upper blast chamber 9 and the cooling cylinder 23 is directed directly to the filament. Subsequently, the filament 7 passes through the channel cylinder 27 behind and leaves the blast box at the outlet side.

[0032] In order to achieve the purpose of this patent, this patent further provides a suction device 44 and a suction hood 25 connected to the suction device 44 through a connecting pipe 36. A suction airflow is generated inside the suction device 44, and the suction airflow can be obtained by the air flow brought by a high-speed flowing liquid (such as a high-flow water column). The suction hood 25 is installed at a distance from the exhaust outlet 37 in a manner that its suction opening 45 is directly opposite to the exhaust outlet 37. The airflow flows from the inside of the suction hood 25 toward the suction device 44.

[0033] The waste gas or monomer collection in the spinning space 21 is blown out of the spinning space 21 under the action of the cooling air flow generated by the upper blowing chamber 9 and the cooling cylinder 23 , and after entering the waste gas chamber 14 , is blown out from the waste gas outlet 37 .

[0034] The suction opening 45 of the suction hood 25 is spaced from the exhaust outlet 37 by a variable distance. Specifically, the upper portion 25.2 of the suction hood 25 is pressed and connected to the fixing portion 32 by means of a tightening element 34, and the tightening element 34 is preferably a flange screw that is locked in cooperation with the threaded hole of the upper portion 25.2. An oblong hole 33 is provided in the middle section of the fixing portion 32, and the tightening element 34 passes through the oblong hole 33. The right end of the fixing portion 32 is butted against the exhaust outlet 37. After the tightening element 34 is rotated in the anti-locking direction, the suction hood 25 can be displaced relative to the fixing portion 32 under the action of an external force, so that the suction hood 25 can move along the length direction of the oblong hole 33.

[0035] Although the structure of the fixing portion 32 is not shown in this cross-sectional view, it is constituted as a mechanism that closes the space between the air intake opening 45 and the exhaust outlet 37 from the upper side, the left side and the right side, and only the lower side is open. The left side and the right side are arranged in a direction perpendicular to the paper surface, and the upper side and the lower side are arranged along the vertical direction of the paper surface. Of course, in principle, the open side is not limited to the lower side, and can also be opened on the other side, or the other two sides, as long as the purpose is to obtain a partially closed structure between the air intake opening 45 and the exhaust outlet 37.

[0036] In this embodiment, by installing the fixing portion 32, a partially closed space is formed between the suction hood 25 and the exhaust outlet 37, and an air inlet opening 35 is formed between the lower portion 25.1 of the suction hood and the exhaust outlet 37, which is open. The distance between the lower portion 25.1 of the suction hood 25 and the exhaust outlet 37 defines the opening of the air inlet opening 35. The air inlet opening 35 communicates with the external environment and is used to introduce airflow from the external environment.

[0037] Based on the movable characteristic of the suction hood, the opening degree of the air inlet opening 35 is adjustable.

[0038] Figure 2 In the state shown, the distance between the suction hood 25 and the exhaust gas outlet 37 is greater than Figure 3 By adjusting the opening of the air inlet opening 35 , the influence of the suction airflow in the suction hood 25 on the filaments in the cooling cylinder 23 can be changed.

[0039] Further, Figure 2The opening of the air inlet opening 35 shown is preferably used for the production of fine-denier yarns. In the case where the air inlet opening 35 is opened at a larger degree, the suction airflow in the suction hood 25 has a weaker effect on the inside of the cooling cylinder 23 due to the introduction of more external airflow, and thus will not significantly affect the fine-denier yarns that are more sensitive to airflow. The partially closed structure between the air intake opening 45 and the exhaust outlet 37 can also more concentratedly collect the exhaust gas or monomer collection discharged from the exhaust outlet 37, which is usually harmful to human health. Correspondingly, Figure 3 The opening of the air inlet opening 35 in the state is formed after the suction hood 25 moves rightward, relative to Figure 2 Since the airflow introduced from the outside environment is small, the suction airflow has a greater impact on the inside of the cooling cylinder 23, so it is more suitable for coarse denier yarns (such as 1 dpf and above). In addition to the cooling of the cooling airflow itself, the suction airflow can assist in cooling the coarse denier yarns.

[0040] The effect of the suction airflow on the cooling cylinder 23 is not completely side-effective, especially for coarse denier filaments that are more resistant to airflow. An overly strong suction airflow will have a negative impact on the filaments, but the negative impact of a suitable suction airflow on the filaments can be ignored, and it can also play a role in assisting the cooling of the filaments. Therefore, for filaments of different deniers, the opening of the air inlet opening 35 can be adjusted to a suitable position. This technical solution is very useful for solving the technical problem of not being able to simultaneously meet the production of different filaments.

[0041] To achieve this purpose, the opening degree of the air inlet opening 35 can also be adjusted in other ways. Figure 4 and Figure 5 This is a cross-sectional view of the second embodiment of this patent.

[0042] The channel 16 has the exhaust gas opening 19, which has a slit-shaped configuration and extends over a portion of the periphery of the channel 16. The exhaust gas opening 19 leads to the laterally arranged exhaust gas chamber 14. At the connecting joint 13, the exhaust gas chamber 14 is equipped with the exhaust gas outlet 37. The exhaust gas outlet 37 leads to an exhaust gas connecting pipe 46, which is fixed to the connecting joint 13. The free end 41 of the exhaust gas connecting pipe 46 is connected to the suction opening 45 of the suction hood 25 via a fixing portion 42. The upper portion 25.2 of the suction hood 25 is fixedly connected to the fixing portion 42 via a fixing element 43. The difference from the first embodiment is that the suction hood 25 is non-displaceable, and the covering portion 39 connected to the lower portion 25.1 of the suction hood 25 is movable. The fixing portion 32 is also constituted as a mechanism for closing the space between the air intake opening 45 and the exhaust outlet 37 from the upper side, the left side and the right side, and only the lower side is open. The left side and the right side are arranged in a direction perpendicular to the paper surface, and the upper side and the lower side are arranged in a vertical direction along the paper surface. Of course, in principle, the open side is not limited to the lower side, and can also be opened on the other side, or the other two sides, as long as the purpose is to obtain a partially closed structure between the air intake opening 45 and the exhaust outlet 37.

[0043] The bottom side of the lower part 25.1 of the suction hood 25 is connected to a covering part 39. The covering part 39 is formed in a plate shape and extends toward the air inlet opening 35. The tightening element 40 presses the lower part 25.1 and the covering part 39. The tightening element 40 is preferably a flange screw that is locked with the threaded hole of the lower part 25.1. The middle section of the covering part 39 is provided with an oblong hole 38, and the tightening element 40 passes through the oblong hole 38. After the tightening element 40 is rotated in the anti-tightening direction, the covering part 39 can move along the length direction of the oblong hole 38. After reaching a suitable position, the tightening element 40 is rotated in the tightening direction to fix it.

[0044] The covering portion 39 is Figure 4 In the shown state, the air inlet opening 35 is made as large as possible, so as to be suitable for the production of fine denier yarns.

[0045] After operating the tightening element 40, Figure 5 The cover portion 39 in the illustrated state is relative to Figure 4 Moving right, the opening of the air inlet opening 35 is reduced, making it suitable for the production of coarse denier yarns (such as 1 dpf and above).

[0046] Preferably, the powdered monomer will fall onto the operator after accumulating at the air intake opening 45 , so the covering portion 39 is constructed with a downwardly concave collecting portion to collect monomer powder, oil droplets and other substances accumulated and dropped at the air intake opening 45 .

[0047] The above embodiment lists the possibility of setting one air inlet opening. The present invention can also set two or more air inlet openings, and can selectively set one of the air inlet openings or all the air inlet openings to be adjustable in opening degree.

[0048] The equipment of the patent is suitable for manufacturing both fine-denier filaments and coarse-denier filaments, and will not incur high equipment modification costs.

[0049] The present application is described above in conjunction with specific embodiments, but it should be clear to those skilled in the art that these descriptions are exemplary and are not intended to limit the scope of protection of the present application. Those skilled in the art can make various modifications and variations to the present application based on the spirit and principles of the present application, and these modifications and variations are also within the scope of the present application.

[0050] The preferred embodiments of the present application are described above with reference to the accompanying drawings. Many features and advantages of these embodiments are clear from this detailed description, and therefore the appended claims are intended to cover all such features and advantages of these embodiments that fall within their true spirit and scope. In addition, since many modifications and changes are easily conceivable to those skilled in the art, the embodiments of the present application are not intended to be limited to the precise structures and operations illustrated and described, but all suitable modifications and equivalents that fall within their scope may be covered.

Claims

1. A device for melt spinning and cooling, comprising a blast box and a plurality of spinnerets on the bottom side of a spinning box, the blast box being connected to a compressed air source and having a plurality of cooling cylinders including air-permeable walls in a blast chamber, the cooling cylinders respectively forming a plurality of inlet holes on the top side of the blast box, the device also comprising a connecting joint, the connecting joint being maintained in a pressure-tight manner relative to the blast box and the spinning box and having at least one exhaust gas opening for exhausting exhaust gas at a channel for each spinneret, the blast box being equipped with a pressure regulating mechanism for regulating the air pressure in the blast chamber, by means of which the air pressure for blowing out exhaust gas at the exhaust gas opening of the connecting joint can be adjusted, the exhaust gas opening is communicated with the exhaust gas chamber, the exhaust gas chamber is communicated with the exhaust gas outlet, the device also comprises a suction hood connected to a suction device with an air suction opening, It is characterized in that The air intake opening is opposite to and spaced from the exhaust gas outlet, and an air intake opening is partially closed between the two and has an adjustable opening.

2. The apparatus for melt spinning and cooling according to claim 1, It is characterized in that The air intake opening is relatively fixed to the exhaust gas outlet, and the covering portion is slidably arranged in cooperation with the air intake opening, so that the opening of the air intake opening is determined by the position of the covering portion.

3. The apparatus for melt spinning and cooling according to claim 1, It is characterized in that The suction hood having the air intake opening is configured to be slidable relative to the exhaust gas outlet, and the opening degree of the air intake opening is determined by the position of the suction hood.

4. The apparatus for melt spinning and cooling according to claim 2 or 3, It is characterized in that The air intake opening and the exhaust gas outlet are partially closed by a fixing portion, and the air intake opening is located at the bottom side of the fixing portion.

5. The apparatus for melt spinning and cooling according to claim 2, It is characterized in that The cover portion is slidably disposed on a bottom side of the air intake opening and is configured to have a collecting portion.

Images