JP7256066B2 - Melt spinning equipment - Google Patents

Description

The present invention relates to melt spinning equipment.

The melt spinning apparatus described in Patent Document 1 spins a molten polymer as a filament from a spinneret. The spun filaments are cooled by cooling air supplied through a cooling cylinder arranged below the spinneret. Here, from the filaments immediately after being spun, a monomer gas, which is a raw material of the polymer, is generated. When the gas solidifies and adheres to the spinneret, cooling cylinder, etc., the cooling air is disturbed and the filaments shake, which may cause problems such as deterioration of yarn quality, occurrence of yarn breakage, and equipment failure.

Therefore, the melt spinning apparatus is configured to be capable of discharging the gas. Specifically, a ring-shaped suction member having a suction port formed on a wall surface is disposed between the spinneret and the cooling cylinder. Further, the melt spinning apparatus generally has an exhaust device for sucking and discharging gas through a suction port by generating a negative pressure. The gas sucked by the exhaust device flows downstream in the direction in which the gas is exhausted (gas exhaust direction) through the connecting pipe to which the exhaust device is connected.

DE102013012869A1

By the way, a yarn production plant is generally provided with a plurality of melt spinning apparatuses, each having an exhaust system, and configured as one large melt spinning facility. Further, generally, a plurality of connection pipes to which a plurality of exhaust devices are respectively connected are arranged so as to merge with a fixed pipe fixedly installed in the production plant. That is, the connection pipe is connected to the middle portion of the fixed pipe. In such a case, for example, if the airflow is disturbed at the confluence point of the fixed pipe and the connecting pipe, part of the gas may flow from the fixed pipe into the connecting pipe (that is, upstream in the gas discharge direction). Due to this, if the pressure in the space on the upstream side in the gas discharge direction fluctuates, the airflow is disturbed in the vicinity of the filaments immediately after being spun, causing the filaments to sway and possibly deteriorating the yarn quality.

An object of the present invention is to suppress turbulence of the airflow near the filament.

The melt spinning equipment of the first invention has a spinning unit having a spinneret for spinning a filament, and a cooling cylinder arranged below the spinneret, and the filament spun from the spinneret and an exhaust unit disposed between the spinning unit and the cooling unit in the running direction of the filament and having a discharge passage for sucking and discharging gas generated from the filament. and, the exhaust unit includes a suction portion disposed between the spinneret and the cooling cylinder, and formed with a suction port for sucking the gas, and a gas discharge direction in which the gas is discharged. a duct portion disposed downstream of the suction portion; an exhaust device disposed downstream of the duct portion in the gas discharge direction to suck and discharge the gas; and an inflow suppressing portion that suppresses inflow of the gas from the fixed pipe to the connecting pipe. and

In the present invention, the connection pipe is connected to the middle portion of the fixed pipe. In such a case, the airflow is disturbed at the confluence point of the fixed pipe and the connecting pipe, and there is a possibility that part of the gas flows back from the fixed pipe to the connecting pipe. As a result, the airflow near the filament is turbulent on the upstream side in the gas discharge direction, making the filament more likely to sway, which may lead to problems such as deterioration of yarn quality and occurrence of yarn breakage. In the present invention, the inflow suppressing portion can suppress the inflow of gas from the fixed pipe to the connecting pipe. Therefore, it is possible to suppress the turbulence of the airflow in the vicinity of the filament.

The melt spinning equipment of the second invention is the melt spinning equipment of the first invention, wherein the exhaust device is configured to be able to change the output, and has a gas inlet for introducing the gas, and the gas At least one of the inflow portion and the duct portion is formed with an outside air intake port that communicates between the discharge passage and a space outside the discharge passage, and the inflow suppressing portion includes the exhaust device and the outside air. and an inlet.

In the present invention, by increasing the output of the exhaust device, the flow rate of the gas flowing through the connecting pipe can be increased, and the flow of gas from the fixed pipe to the connecting pipe can be suppressed. However, simply increasing the output of the exhaust device increases the negative pressure in the space on the upstream side of the exhaust device in the gas discharge direction, and the gas discharge speed in the vicinity of the filament becomes too high, causing the airflow in the vicinity of the filament to become turbulent. The problem is that it becomes easier. For this reason, as a further countermeasure, for example, it is conceivable to provide a valve between the suction unit and the exhaust device in the gas discharge direction to increase the flow resistance and suppress the gas flow rate on the upstream side. However, this method has a problem that the valve narrows the gas discharge channel, and the channel is likely to be clogged when the monomer gas solidifies.

Therefore, in the present invention, at least one of the gas inlet portion and the duct portion is formed with an outside air intake port. As a result, when the exhaust device is in operation, outside air can be taken into the discharge channel through the outside air intake port, so that the gas flowing through the discharge channel and the outside air join together, thereby increasing the suction pressure. (negative pressure) can be weakened. Therefore, compared to the case where the outside air intake is not formed, the flow velocity of the gas flowing from the upstream side in the gas discharge direction of the outside air intake can be made smaller. Therefore, even when the output of the exhaust device is strong, it is possible to suppress the increase in gas ejection speed in the vicinity of the filament without narrowing the gas ejection passage, and to suppress the turbulence of the airflow in the vicinity of the filament f.

A melt spinning facility according to a third aspect of the invention is characterized in that, in the second aspect of the invention, the exhaust unit has an adjustment section for adjusting the degree of opening of the outside air intake port.

According to the present invention, when it is desired to adjust the flow rate of outside air taken in through the outside air intake, the flow rate can be adjusted by adjusting the opening degree of the outside air intake with the adjustment unit.

A melt spinning facility of a fourth invention is the melt spinning equipment according to the third invention, wherein the adjustment section has a cover section for covering a part of the outside air intake, and the cover section comprises the outside air intake. It is characterized in that the area of the portion covering the outside air intake can be changed by moving along a plane including the edge of the outside air intake.

In the present invention, the opening degree of the outside air intake can be easily adjusted by a simple operation of moving the cover portion along the plane including the edge of the outside air intake.

The melt spinning equipment according to a fifth aspect of the invention is characterized by comprising a plurality of the exhaust units in the third or fourth aspect of the invention.

In a configuration in which multiple exhaust units are provided (that is, multiple connection pipes are connected to a fixed pipe), the optimum flow rate of outside air taken in via the outside air intake port may differ from one exhaust unit to another. In such a configuration, it is particularly effective that each exhaust unit is provided with an adjustment section as in the present invention.

The melt spinning equipment of the sixth invention is the melt spinning equipment according to any one of the third to fifth inventions, wherein the spinning units include a first spinning unit and a second spinning unit different from the first spinning unit. The exhaust unit includes, as the suction portions, a first suction portion corresponding to the first spinning unit, a second suction portion corresponding to the second spinning unit, and the duct portion as the first suction portion. and a second duct portion corresponding to the second suction portion, and the exhaust device has a first gas inflow portion corresponding to the first duct portion as the gas inlet and a second gas inflow portion corresponding to the second duct portion, and as the outside air intake port, the first outside air intake port corresponding to the first duct portion and the first gas inflow portion and a second outside air intake port corresponding to the second duct portion and the second gas inlet portion are formed, and the adjusting portion is a second opening for adjusting the opening degree of the first outside air intake port. 1 adjusting part, and a second adjusting part for adjusting the degree of opening of the second outside air intake.

In a configuration in which one exhaust device is provided with the first gas inlet and the second gas inlet, the optimum flow rate of outside air taken in via the outside air inlet may differ for each gas inlet. In such a configuration, it is particularly effective to provide the first adjustment section and the second adjustment section as in the present invention.

A melt spinning facility according to a seventh invention is characterized in that, in any one of the second to sixth inventions, the outside air intake port is formed in the gas inlet portion of the exhaust device. be.

If the outside air intake where the discharged gas and the outside air join is arranged near the suction part in the gas discharge direction, the air flow is likely to be disturbed near the suction port, and the filament may be easily shaken. be. In the present invention, the outside air intake port is formed in the gas inlet portion of the exhaust device, and is arranged at a position far from the suction portion. Therefore, it is possible to prevent the airflow from being easily disturbed in the vicinity of the suction port, and it is possible to prevent the filament from being easily shaken.

The melt spinning equipment of the eighth invention is the melt spinning equipment according to any one of the first to seventh inventions, wherein the inflow suppressing part is disposed downstream of the connecting pipe in the gas discharge direction, and It is characterized by having an air shielding member extending inward to prevent the gas in the fixed pipe from flowing into the connecting pipe.

In the present invention, the windshield member arranged to extend inside the fixed pipe prevents the gas inside the fixed pipe from flowing into the connecting pipe. Therefore, the backflow of gas can be suppressed without changing the output of the exhaust system or in conjunction with changing the output of the exhaust system.

A ninth aspect of the invention is a melt spinning facility according to any one of the first to eighth aspects of the invention, wherein the gas is discharged from one side to the other side in the extending direction of the fixed pipe, and the wind shield member comprises: It is characterized by extending in an orthogonal direction orthogonal to the extending direction, or being inclined to the other side of the extending direction with respect to the orthogonal direction.

In a configuration in which the windshield member is inclined to one side in the extension direction with respect to the orthogonal direction, the gas that hits the windshield member flows backward to one side in the extension direction and then goes to the other side again, thereby establishing a connection. It may flow into pipes. In the present invention, it is possible to prevent the gas that hits the windshield member from flowing back to one side in the extending direction. Therefore, it is possible to effectively suppress the gas from flowing into the connection pipe from the fixed pipe.

The melt spinning equipment of a tenth invention is the melt spinning equipment according to any one of the first to ninth inventions, wherein the suction part is arranged so as to surround the filaments spun from the spinneret, and the suction port is provided on the peripheral wall. and an enclosing member connected to the exhaust device, provided so as to surround the suction ring, and having an internal space in which the gas discharged from the inside of the suction ring flows. It is characterized by having

In the present invention, a substantially enclosed interior space is formed by the suction ring and the enclosing member. This allows gas to be efficiently sucked into the internal space even if the negative pressure generated by the evacuation device is weak. For this reason, even a slight change in the negative pressure causes a large change in the flow velocity of the gas, which may disturb the airflow and shake the filament. In such a configuration, it is particularly effective that the inflow suppressing portion can suppress backflow of gas from the fixed pipe to the connecting pipe as in the present invention.

The melt spinning equipment of the eleventh invention is the melt spinning equipment according to any one of the first to tenth inventions, wherein the exhaust device includes a water inlet for introducing water, which is provided separately from the gas inlet, The aspirator is characterized by comprising an outflow part connected to the connecting pipe for discharging the gas and the water.

In a configuration in which an aspirator is applied as an exhaust device, negative pressure is generated by a flow associated with water flowing inside the aspirator, and gas is sucked. The aspirator has the advantage of being able to generate a minute negative pressure by adjusting the flow rate of water and the advantage of being able to dissolve the monomer in water and discharge it.

On the other hand, since water flows into the fixed pipe via the outflow portion and the connecting pipe, there is a risk that a large amount of water will flow in the fixed pipe and a strong accompanying flow will occur. If such an accompanying flow flows backward from the fixed pipe to the connecting pipe, the negative pressure may fluctuate significantly on the upstream side in the gas discharge direction. Therefore, in order to suppress the accompanying flow that flows from the fixed pipe to the connecting pipe, it is necessary to increase the amount of water that flows through the aspirator and to strengthen the accompanying flow that flows from the connecting pipe to the fixed pipe. On the other hand, if the accompanying flow for sucking the gas becomes stronger, the negative pressure becomes too strong, and the filament may shake greatly. In such a configuration, it is particularly effective that the inflow suppressing portion can suppress backflow of gas from the fixed pipe to the connecting pipe as in the present invention.

1 is a schematic diagram of a melt spinning facility according to the present embodiment; FIG. FIG. 4 is an enlarged view of the spinning beam and its peripheral configuration; 3 is a cross-sectional view taken along line III-III of FIG. 2; FIG. It is a top view of a suction part and its peripheral structure. 5 is a cross-sectional view taken along the line V-V of FIG. 4; FIG. It is an explanatory view showing an aspirator and its peripheral configuration. (a), (b) is explanatory drawing which shows the detailed structure of an aspirator. (a), (b) is explanatory drawing which shows an adjustment member. (a), (b) is explanatory drawing which shows the change of the opening degree of a slit. FIG. 4 is an explanatory diagram showing airflow in the vicinity of a slit; It is an explanatory view showing an exhaust unit according to a modification. FIG. 11 is an explanatory diagram showing an exhaust unit according to another modified example;

Next, an embodiment of the invention will be described. Note that the directions shown in FIGS. 1 and 2 are defined as the front, rear, left, right, up and down directions, and the following description will proceed.

(melt spinning equipment)
First, a schematic configuration of a melt spinning facility 1 according to this embodiment will be described with reference to FIGS. 1 to 3. FIG. FIG. 1 is a schematic diagram of a melt spinning facility 1 according to this embodiment. FIG. 2 is an enlarged view of the spinning beam 2 and its surroundings, which will be described later. FIG. 3 is a cross-sectional view taken along line III-III of FIG.

As shown in FIG. 1, the melt spinning equipment 1 comprises a plurality of spinning beams 2 (spinning units of the present invention), a plurality of yarn cooling devices 3 (cooling units of the present invention), and a plurality of exhaust units 4. . Each spinning beam 2 spins filaments f of molten polymer. A yarn cooling device 3 provided corresponding to each spinning beam 2 cools the spun filaments f. The exhaust unit 4 sucks and exhausts the gas of the monomer (polymer raw material) generated from the filament f immediately after being spun. In this embodiment, one exhaust unit 4 is provided for two spinning beams 2 and two yarn cooling devices 3 . As a specific example, a spinning beam 2a (first spinning unit of the present invention), a spinning beam 2b (second spinning unit of the present invention) separate from the spinning beam 2a, and an exhaust unit 4a corresponding to the yarn cooling devices 3a, 3b is provided. An exhaust unit 4b is provided corresponding to the spinning beams 2c, 2d and the yarn cooling devices 3c, 3d. Gas sucked by each exhaust unit 4 is discharged through a fixed pipe 100 which is fixedly installed.

The spinning beam 2 is arranged to spin a plurality of yarns Y of molten polymer. The molten polymer spun in this embodiment is, for example, nylon 6 (PA6). As shown in FIG. 2 the spinning beam 2 comprises a plurality of pack housings 11 . A plurality of spinning packs 12 are attached to the plurality of pack housings 11, respectively. In this embodiment, 12 spinning packs 12 are attached to 12 pack housings 11 respectively. The plurality of pack housings 11 (the plurality of spinning packs 12) are arranged, for example, in two rows along the left-right direction and arranged in a zigzag arrangement. Molten polymer is supplied to each spinning pack 12 from a pipe or the like (not shown). Note that the arrangement of the pack housings 11 is not limited to that described above. For example, the pack housings 11 may be arranged in a row along the left-right direction, for example. Alternatively, the pack housings 11 may be arranged in three or more rows. Moreover, when the pack housings 11 are arranged in a plurality of rows, the pack housings 11 may be arranged in a staggered manner, or may be aligned in the horizontal direction. Alternatively, the plurality of pack housings 11 may not be arranged in a straight line, and may be arranged, for example, so as to form a virtual circle when viewed from above and below.

A spinneret 13 formed with a plurality of nozzles 14 is arranged at the lower end of each spinning pack 12 . The spinning pack 12 spins the molten polymer as filaments f from a plurality of nozzles 14 of a spinneret 13 . That is, one multifilament yarn (yarn Y) composed of a plurality of filaments f is spun from one spinneret 13 . Here, the monomer gas is generated from the filament f immediately after being spun as described above. The monomer gas is sucked out by the exhaust unit 4 .

The yarn cooling device 3 is a device that cools the filaments f spun from the multiple spinning packs 12 . A yarn cooling device 3 is arranged below the spinning beam 2 . As shown in FIGS. 2 and 3, the yarn cooling device 3 has a box 20, a plurality of cooling cylinders 21 accommodated in the box 20, a plurality of partitioning cylinders 22, and the like.

As shown in FIG. 2 , the internal space of the box 20 is vertically partitioned by a current plate 23 . The straightening plate 23 is a member made of a material having a straightening function, such as punching metal, and is arranged horizontally. A cooling cylinder 21 is arranged at a position directly below the spinning pack 12 in the upper space of the box 20 (the space above the current plate 23). A plurality of cooling cylinders 21 are arranged in a zigzag arrangement along the horizontal direction corresponding to the arrangement of the plurality of spinning packs 12 (see FIG. 3). The wall of the cooling cylinder 21 is made of a material having a rectifying function, such as punching metal, like the rectifying plate 23 . A plurality of partition tubes 22 are arranged in a lower space of the box 20 (a space below the rectifying plate 23 ), directly below the plurality of cooling tubes 21 . Unlike the cooling cylinder 21, the wall of the partition cylinder 22 is made of a material impermeable to air. The filament f passes through the inner space of the cooling cylinder 21 immediately below the spinning pack 12 and the inner space of the partitioning cylinder 22 in order.

A duct 25 is connected to the lower rear portion of the box 20 . Air for cooling the filament f is sent into the duct 25 by a compressed air source (not shown). Air is supplied into the lower space of the box 20 through the duct 25 . The cooling air that has flowed into the lower space of the box 20 passes through the horizontally arranged rectifying plate 23 and is rectified upward to flow into the upper space of the box 20 . The air that has flowed into the upper space of the box 20 is straightened when passing through the wall of the cooling cylinder 21 and flows into the cooling cylinder 21 . As a result, in the cooling cylinder 21, air is blown onto the filament f from the outer circumference of the cooling cylinder 21, and the filament f is cooled. Since the wall of the partition cylinder 22 is impervious to air, air does not directly flow into the partition cylinder 22 from the lower space of the box 20 .

The exhaust unit 4 is arranged between the spinning beam 2 and the yarn cooling device 3 in the running direction of the filaments f. The exhaust unit 4 sucks and discharges the monomer gas generated from the molten polymer immediately after being spun from the plurality of nozzles 14 of the spinneret 13 . Details will be described later.

An oil guide 5 for applying oil to the yarn Y is arranged below the cooling tube 21 and the partition tube 22 . The yarn Y cooled by the cooling cylinder 21 contacts the oil agent guide 5 . At that time, the oil agent guide 5 discharges the oil agent to the yarn Y to apply the oil agent to the yarn Y. As shown in FIG. The yarn Y to which oil has been applied by the oil guide 5 is taken up by a take-up roller (not shown) arranged below the oil guide 5 . Further, the yarn Y is sent to a winding device (not shown) and wound on a bobbin (not shown) in the winding device.

(exhaust unit)
Next, the configuration of the exhaust unit 4 will be described with reference to FIGS. 4 to 6. FIG. FIG. 4 is a plan view of the later-described suction member 31 and its peripheral configuration. 5 is a cross-sectional view taken along the line VV of FIG. 4. FIG. FIG. 6 is an explanatory diagram showing an aspirator 33 and its peripheral configuration, which will be described later.

The exhaust unit 4 is configured to suck and exhaust gas including monomer gas (hereinafter simply referred to as gas) generated from the molten polymer immediately after being spun. That is, the exhaust unit 4 is formed with a discharge passage 30 (see FIGS. 1 and 4) for sucking and discharging gas. As shown in FIGS. 4 to 6, the exhaust unit 4 includes two suction members 31 (suction portions of the present invention), two ducts 32 (duct portions of the present invention), and an aspirator 33 (exhaust device of the present invention). ) and a connecting pipe 34 (see FIG. 6). The exhaust unit 4 sucks the gas from the radially inner space of a plurality of suction rings 42 (described later) provided in the suction member 31 by the negative pressure generated by the water flowing in the aspirator 33, and the duct 32, The gas is discharged through the aspirator 33 and the connecting tube 34 (see arrows in FIG. 4). In this embodiment, one suction member 31 is provided corresponding to one spinning beam 2 (see FIG. 1). For example, a suction member 31a (first suction section of the present invention) is provided corresponding to the spinning beam 2a, and a suction member 31b (second suction section of the present invention) is provided corresponding to the spinning beam 2b.

As shown in FIG. 4 , each suction member 31 has an enclosing member 41 and a plurality of suction rings 42 . The surrounding member 41 surrounds the plurality of suction rings 42 by attaching the plurality of suction rings 42, and directs the gas discharged from the inside of the plurality of suction rings 42 in the direction in which the gas is discharged (gas discharge direction). It is a member for flowing to the aspirator 33 side. Enclosure member 41 is connected to aspirator 33 via duct 32 . The enclosing member 41 has a generally flat shape as a whole. In the enclosing member 41, an internal space 46 is formed by two vertically arranged flat plates 43 and 44 arranged substantially horizontally and a side wall 45 connecting the outer peripheral portions of the flat plates 43 and 44 ( See Figure 5). The internal space 46 is a space that is substantially sealed with respect to the space in which the melt spinning equipment 1 is provided, except for a portion in which a suction port 52 (to be described later) is formed.

The enclosing member 41 has an enclosing portion 47 that encloses the plurality of suction rings 42, and two flow passage portions 48 arranged closer to the aspirator 33 in the gas discharge direction than the enclosing portion 47 (in FIG. The portion 47 and the two flow path portions 48 are separated by a two-dot chain line 101). The enclosing part 47 has a rectangular shape when viewed from above (see FIG. 4). The enclosure 47 is arranged vertically between the spinning beam 2 and the yarn cooling device 3 (see FIG. 5). A plurality of fitting holes 49 into which the plurality of suction rings 42 are respectively fitted are formed in the surrounding portion 47 . The plurality of fitting holes 49 are arranged in a zigzag arrangement along the left-right direction so as to correspond to the plurality of spinnerets 13 respectively. The two channel portions 48 are portions connected to the front end of the enclosing portion 47 . The two flow paths 48 are arranged side by side in the left-right direction, and each has a generally triangular shape when viewed from above. The front ends of the two channel portions 48 are attached to the duct 32 respectively.

The plurality of suction rings 42 are members for discharging gas generated from the filaments f immediately after being spun. As shown in FIG. 5, the plurality of suction rings 42 are arranged between the spinning pack 12 and the cooling cylinder 21 in the vertical direction. Each suction ring 42 is arranged so as to surround the filament f immediately after being spun. The plurality of suction rings 42 are fitted into the plurality of fitting holes 49 of the enclosing member 41 and attached so as to be surrounded by the enclosing member 41 . A plurality of suction ports 52 are formed side by side in the peripheral wall 51 of each suction ring 42 along the circumferential direction of each suction ring 42 . The space inside the suction ring 42 and the internal space 46 of the enclosing member 41 communicate with each other through the plurality of suction ports 52 .

Duct 32 is configured to connect enclosure member 41 and aspirator 33 . That is, the duct 32 is arranged on the downstream side of the enclosing member 41 in the gas discharge direction, and is arranged on the upstream side of the aspirator 33 in the gas discharge direction. Duct 32 has two upstream portions 61 and one downstream portion 62 . Front end portions (downstream end portions in the gas discharge direction) of the two flow passage portions 48 of the enclosing member 41 are attached to the two upstream portions 61 respectively. The two upstream portions 61 are connected to the upstream end of the downstream portion 62 and merge. A downstream end of the downstream portion 62 in the gas discharge direction is connected to the aspirator 33 . In this embodiment, one duct 32 is provided corresponding to one suction member 31 . For example, a duct 32a (first duct portion of the present invention) is provided corresponding to the suction member 31a, and a duct 32b (second duct portion of the present invention) is provided corresponding to the suction member 31b (FIG. 4). reference).

The aspirator 33 is a device for sucking and discharging gas. The aspirator 33 is arranged downstream of the suction member 31 and the duct 32 in the gas discharge direction. The aspirator 33 is capable of generating a minute suction pressure (for example, -5 Pa) by means of an accompanying flow caused by water flowing inside, and dissolving the monomer gas in water and discharging it. is possible. Also, the aspirator 33 can change its output by changing the condition of the flow rate of the water that flows inside. As shown in FIG. 6 , the aspirator 33 has a main body 71 , a water inlet 72 , two gas inlets 73 and an outlet 74 .

The main body 71 is a cylindrical portion extending vertically. A water inflow portion 72 for inflowing water is provided on the upper portion of the main body 71 . Two gas inlets 73 are provided on both left and right side surfaces of the main body 71 to allow gas to flow therein. At the bottom of the body 71, an outflow part 74 is provided for discharging water and gas.

The water inflow part 72 is provided on the upper part of the main body 71 and attached to a pipe 75 connected to a water source (not shown). The water inlet 72 is formed with a water inlet 76 (see FIG. 7A) through which water flows.

The two gas inlet portions 73 are generally cylindrical portions provided on both left and right side surfaces of the main body 71 . A gas inlet 77 (see FIG. 7A) for introducing gas is formed in each of the two gas inlets 73 . The two gas inlets 73 are each connected to the suction member 31 via the duct 32 . For example, a gas inlet portion 73a (first gas inlet portion of the present invention) is provided corresponding to the duct 32a, and a gas inlet portion 73b (second gas inlet portion of the present invention) is provided corresponding to the duct 32b. there is

The outflow part 74 is provided in the lower part of the main body 71 and attached to the connecting pipe 34 . The outflow portion 74 is formed with an outflow port 78 (see FIG. 7A) for discharging water and gas.

The connection pipe 34 is arranged downstream of the aspirator 33 in the direction of gas discharge. An outflow portion 74 of the aspirator 33 is attached to the upstream end portion of the connecting pipe 34 in the gas discharge direction. A downstream end portion of the connecting pipe 34 in the gas discharge direction is attached to a middle portion of the fixed pipe 100 in the extending direction of the fixed pipe 100 .

As described above, the suction member 31 , the duct 32 , the aspirator 33 and the connection pipe 34 form the discharge flow path 30 for discharging the gas in the exhaust unit 4 .

In the exhaust unit 4 having the above configuration, as the water entering from the water inflow portion 72 of the aspirator 33 flows inside the main body 71 (see the two-dot chain line arrow in FIG. 6), a downward accompanying flow is generated. Due to this accompanying flow, a negative pressure is generated in the vicinity of the suction port 52 of the suction ring 42 (see FIG. 4), and the gas is sucked from the inside of the suction ring 42 into the internal space 46 of the enclosure member 41 (see FIG. 4). . Furthermore, the gas flows through the interior of the duct 32 into the gas inlet 73 of the aspirator 33 (see the dashed arrow in FIG. 6). The gas that has flowed into the gas inflow portion 73 flows out from the outflow portion 74 together with water, passes through the interior of the connecting pipe 34 and flows into the fixed pipe 100 . In this way the gas is sucked out by the exhaust unit 4 . As described above, since the internal space 46 formed by the enclosing member 41 is substantially sealed, even if the negative pressure generated by the aspirator 33 is weak, a strong suction force is generated in the vicinity of the suction port 52 of the suction ring 42. can be generated.

Here, as described above, the connection pipe 34 is connected to the middle portion of the fixed pipe 100 . In such a case, for example, if the airflow is disturbed at the junction of the fixed pipe 100 and the connecting pipe 34, some gas may flow from the fixed pipe 100 into the connecting pipe 34 (see the dashed-dotted arrow in FIG. 6). In particular, in a configuration in which a plurality of aspirators 33 are provided, a large amount of water may flow into the fixed pipe 100, causing a large amount of water W (see FIG. 6) to flow into the fixed pipe 100 and generate a strong accompanying flow. If such an accompanying flow flows backward from the fixed pipe 100 to the connecting pipe 34, the negative pressure may fluctuate significantly on the upstream side in the gas discharge direction. Therefore, there is a possibility that the filament f will sway due to turbulent airflow near the filament f (see FIG. 2) immediately after being spun, degrading the yarn quality.

Therefore, it is necessary to suppress the flow of gas from the fixed pipe 100 to the connecting pipe 34 . For this purpose, for example, it is conceivable to increase the flow rate of water flowing through the aspirator 33 to strengthen the accompanying flow flowing from the connection pipe 34 to the fixed pipe 100 side (that is, downstream in the gas discharge direction). This suppresses the inflow of the gas from the fixed pipe 100 to the connecting pipe 34 .

On the other hand, when such an accompanying flow becomes stronger, the negative pressure in the space on the upstream side of the aspirator 33 in the gas discharge direction becomes stronger, and the discharge speed of the gas in the vicinity of the filament f becomes too large, causing the filament f to become large. It may shake. For this reason, as a further countermeasure, for example, it is conceivable to provide a valve between the suction member 31 and the aspirator 33 in the gas discharge direction to increase the flow resistance and suppress the flow rate of the gas. However, in this method, the gas discharge channel 30 is narrowed by the valve, and the channel is likely to be clogged when the monomer solidifies. Therefore, in the present embodiment, even when the output of the aspirator 33 is strong (that is, the flow rate of water is large), the increase in gas discharge speed in the vicinity of the filament f is suppressed without narrowing the gas discharge passage 30. To do this, the exhaust unit 4 has the following configuration. Specifically, the exhaust unit 4 has an inflow suppressing portion 70 (see FIGS. 7A and 7B) for suppressing the inflow of gas from the fixed pipe 100 to the connecting pipe 34 . The inflow suppressing portion 70 includes the aspirator 33 described above and an outside air intake port 81 described later.

(Detailed configuration of exhaust unit)
A more detailed configuration of the exhaust unit 4 will be described with reference to FIGS. 7A, 7B, 8A, 8B and 9A, 9B. FIG. 7A is a cross-sectional view of the aspirator 33 orthogonal to the front-rear direction. FIG. 7B is a perspective view of the gas inlet portion 73. FIG. FIG. 8(a) is a front view of the aspirator 33 including an adjusting member 83, which will be described later. 8B is a perspective view of the adjusting member 83. FIG. FIG. 9(a) is a view taken along arrow IXa in FIG. 8(b). FIG. 9(b) is an explanatory view showing the state of the adjusting member 83 after the adjusting member 83 has been moved from the state shown in FIG. 9(a). 7A and 7B, illustration of the adjusting member 83 is omitted.

As shown in FIGS. 7A and 7B, each gas inlet portion 73 of the aspirator 33 is formed with an outside air intake port 81 . The outside air intake port 81 communicates the discharge channel 30 with a space (external space 82 ) outside the discharge channel 30 , and is for taking outside air (air) from the external space 82 into the discharge channel 30 . be. The outside air intake port 81 is formed, for example, in a slit shape along the circumferential direction of the gas inlet portion 73 so as to encircle the gas inlet portion 73 approximately halfway. The outside air intake port 81 opens upward, for example. In this manner, the outside air intake port 81 allows the discharge channel 30 and the external space 82 to communicate with each other. An outside air intake port 81a (first outside air intake port of the present invention) is formed corresponding to the gas inflow portion 73a, and an outside air intake port 81b (second outside air intake port of the present invention) is formed corresponding to the gas inflow portion 73b. mouth) is formed. In this embodiment, two each of the outside air intake ports 81a and 81b are formed. Note that the number of outside air intake ports 81 is not limited to this.

As shown in FIGS. 8(a) and 8(b), each gas inlet portion 73 is provided with an adjusting member 83 (adjusting portion of the present invention). The adjustment member 83 is for adjusting the degree of opening of the outside air intake port 81 . An adjusting member 83a (first adjusting portion of the present invention) is provided corresponding to the outside air intake port 81a, and an adjusting member 83b (second adjusting portion of the present invention) is provided corresponding to the outside air intake port 81b. there is The adjustment member 83 has a cylindrical portion 84 (cover portion of the present invention) and a knob portion 85 .

The cylindrical portion 84 is a cylindrical portion arranged to surround the portion of the gas inlet portion 73 where the outside air intake port 81 is formed. A slit 86 is formed in the tubular portion 84 along the circumferential direction of the tubular portion 84 so as to extend approximately halfway around the tubular portion 84 . The slit 86 is arranged at substantially the same position as the outside air intake port 81 in the direction in which the gas inlet portion 73 extends. The cylindrical portion 84 is rotatable (that is, movable) in the circumferential direction of the cylindrical portion 84 along a surface including the edge of the outside air intake port 81 of the gas inflow portion 73 (that is, the peripheral surface of the gas inflow portion 73). (see the arrow in FIG. 8(b)).

The knob portion 85 is a portion that protrudes outward in the radial direction of the tubular portion 84 from a portion of the tubular portion 84 in the circumferential direction. The grip portion 85 has a size that can be gripped by an operator so that the operator can manually rotate the cylindrical portion 84 .

By rotating the cylindrical portion 84 by pinching the knob portion 85 by the operator, the slit 86 of the cylindrical portion 84 can be moved along the peripheral surface of the gas inlet portion 73 . Thereby, the positional relationship between the slit 86 and the outside air intake 81 can be changed, and the opening degree of the outside air intake 81 can be adjusted. For example, when the slit 86 completely overlaps the outside air intake 81 (see FIG. 9A), the opening of the outside air intake 81 is It is twice the opening of the outside air intake port 81 (see FIG. 9B) (see hatched portions in FIGS. 9A and 9B).

A pressure gauge 87 for detecting gas pressure is arranged near the outside air intake port 81 of the gas inflow portion 73 (see FIG. 8A).

(Airflow in the vicinity of the outside air intake)
Next, the airflow in the vicinity of the outside air intake port 81 of the gas inflow portion 73 of the exhaust unit 4 having the inflow suppressing portion 70 described above will be described with reference to FIG.

When water flows through the aspirator 33 (see the two-dot chain line arrow in FIG. 10), a negative pressure is generated by the attendant flow, and gas is sucked through the gas inlet 73 (see the dashed line arrow in FIG. 10). Here, as the flow rate of water is increased, the accompanying flow becomes stronger, and the flow of gas from the fixed pipe 100 (see FIG. 6) into the connecting pipe 34 can be suppressed. Also, due to the negative pressure, outside air is taken into the gas inlet portion 73 from the outer space 82 via the outside air intake port 81 formed in the gas inlet portion 73 (see the dashed-dotted arrow in FIG. 10). As a result, in the vicinity of the outside air intake port 81, the gas flowing through the discharge passage 30 joins the outside air, and the suction pressure (negative pressure) is weakened. For this reason, even if the flow rate of the water flowing through the aspirator 33 is increased to strengthen the accompanying flow, compared to the case where the outside air intake port 81 is not formed, the airflow from the upstream side of the outside air intake port 81 in the gas discharge direction is reduced. The flow velocity of the flowing gas can be reduced. As a result, it is possible to suppress an increase in the discharge speed of the gas in the vicinity of the filament f (see FIG. 2) immediately after being spun. In this manner, the aspirator 33 and the outside air intake port 81 can prevent the filament f from easily swinging and prevent the gas from flowing from the fixed tube 100 to the connecting tube 34 .

Further, the operator moves the adjustment member 83 based on the detection result of the pressure gauge 87 to adjust the opening degree of the outside air intake port 81, thereby adjusting the flow rate of the outside air taken in through the outside air intake port 81. Fine adjustments can be made for each inflow portion 73 . As a result, it is possible to suppress variations in gas flow velocity in the vicinity of the suction port 52 (see FIG. 5) among the plurality of suction members 31 (see FIG. 4). The opening degree of the outside air intake port 81 may be adjusted in advance before operating the melt spinning equipment 1 . In other words, it is not necessary to adjust the opening degree of the outside air intake port 81 while the melt spinning equipment 1 is in operation.

As described above, the inflow suppressing portion 70 can suppress the inflow of gas from the fixed pipe 100 to the connecting pipe 34 . Therefore, it is possible to suppress the turbulence of the airflow in the vicinity of the filament f.

An outside air intake port 81 is formed in the gas inlet portion 73 . As a result, when the aspirator 33 is in operation, outside air can be taken into the discharge passage 30 through the outside air intake port 81, so that the gas flowing through the discharge passage 30 and the outside air can be merged. can weaken the suction pressure (negative pressure). Therefore, compared to the case where the outside air intake port 81 is not formed, the flow velocity of the gas flowing from the upstream side of the outside air intake port 81 in the gas discharge direction can be made smaller. Therefore, even when the output of the aspirator 33 is strong (the flow rate of water is large), it is possible to suppress an increase in the discharge speed of the gas in the vicinity of the filament f without narrowing the gas discharge passage 30. turbulence of the airflow can be suppressed.

Further, when it is desired to adjust the flow rate of outside air taken in through the outside air intake port 81 , the flow rate can be adjusted by adjusting the opening degree of the outside air intake port 81 with the adjusting member 83 .

Further, by rotating (moving) the cylindrical portion 84 of the adjusting member 83 along the peripheral surface of the gas inlet portion 73, the degree of opening of the outside air intake port 81 is adjusted. The opening degree of the outside air intake port 81 can be easily adjusted by such a simple operation of moving the cylindrical portion 84 .

In addition, in a configuration in which a plurality of exhaust units 4 are provided (that is, a plurality of connection pipes 34 are connected to the fixed pipe 100), the optimal flow rate of the outside air taken in through the outside air intake port 81 is determined by the exhaust unit. 4 can be different. In such a configuration, it is particularly effective that each exhaust unit 4 is provided with the adjustment member 83 .

In addition, in a configuration in which one aspirator 33 is provided with the gas inflow portion 73a and the gas inflow portion 73b, the optimum flow rate of outside air taken in through the outside air intake port 81 may differ for each gas inflow portion 73. FIG. In such a configuration, provision of the adjusting member 83a and the adjusting member 83b is particularly effective.

Further, an outside air intake port 81 is formed in the gas inlet portion 73 of the aspirator 33 and arranged at a position far from the suction member 31 . Therefore, compared with the case where the outside air intake port 81 is arranged at a position close to the suction member 31, it is possible to suppress the occurrence of turbulence in the airflow in the vicinity of the filament f, and it is possible to suppress the filament f from easily swinging.

Further, in this embodiment, the suction ring 42 and the enclosing member 41 form a substantially closed internal space 46 . Thereby, even if the negative pressure generated by the aspirator 33 is weak, the gas is efficiently sucked into the internal space 46 . For this reason, even a slight change in the negative pressure may cause a large change in the amount of sucked gas, disturbing the airflow and causing the filament f to sway. In such a configuration, it is particularly effective to reduce the negative pressure in the vicinity of the filament f by taking in outside air through the outside air intake port 81, thereby suppressing an increase in gas discharge speed.

In addition, in the configuration in which the aspirator 33 is applied as a device for discharging gas, a large amount of water may flow in the fixed pipe 100 and a strong accompanying flow may occur. Therefore, in order to suppress the accompanying flow that flows from the fixed pipe 100 to the connecting pipe 34 , it is necessary to increase the amount of water that flows through the aspirator 33 to strengthen the accompanying flow that flows from the connecting pipe 34 to the fixed pipe 100 . In such a configuration, it is particularly effective to reduce the negative pressure in the vicinity of the filament f by taking in outside air through the outside air intake port 81, thereby suppressing an increase in gas discharge speed.

Next, a modification in which the above embodiment is modified will be described. However, components having the same configurations as those of the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

(1) In the above-described embodiment, the outside air intake port 81 extends in a slit shape along the circumferential direction of the gas inlet portion 73, but it is not limited to this. The outside air intake port 81 may extend, for example, in a slit shape along the direction in which the gas inlet portion 73 extends. Alternatively, the outside air intake port 81 may be a round hole. That is, the outside air intake port 81 may have any shape.

(2) In the above-described embodiments, the tubular portion 84 of the adjusting member 83 is rotatable along the peripheral surface of the gas inlet portion 73, but the present invention is not limited to this. For example, the tubular portion 84 may be configured to be movable in the direction in which the gas inlet portion 73 extends.

(3) In the above-described embodiments, the adjustment member 83 is moved along the peripheral surface of the gas inlet portion 73 to change the opening degree of the outside air intake port 81. can't As an example, the adjustment member 83 may have a slide member (not shown) that can slide with respect to the slit 86 . Then, by sliding the slide member, the opening degree of the slit 86 itself may be changed, and as a result, the opening degree of the outside air intake port 81 may be changed.

(4) In the above-described embodiments, the outside air intake port 81 is formed in the gas inlet portion 73 of the aspirator 33, and the gas inlet portion 73 is surrounded by the adjusting member 83 for adjusting the opening degree of the outside air intake port 81. However, it is not limited to this. For example, as shown in FIG. 11, the duct 91 may be formed with an outside air intake 92, and the gas inlet 94 of the aspirator 93 may not be formed with an outside air intake. Furthermore, the adjustment member 83 may be arranged so as to surround the duct 91 . Alternatively, the outside air intake port 92 may be formed in both the gas inlet portion 94 and the duct 91 . Alternatively, the outside air intake port may be formed in the flow path portion 48 of the enclosing member 41, for example. In this case, the channel portion 48 also corresponds to the duct portion of the present invention. Also, the enclosing portion 47 of the enclosing member 41 and the suction ring 42 correspond to the suction portion of the present invention.

(5) In the above embodiments, the melt spinning equipment 1 is provided with a plurality of exhaust units 4, but the present invention is not limited to this. The number of exhaust units 4 may be one.

(6) In the above embodiments, the aspirator 33 has two gas inlets 73, but the present invention is not limited to this. That is, the number of gas inflow portions 73 included in one aspirator 33 may be one, or three or more.

(7) In the above embodiments, the exhaust unit 4 has the adjusting member 83, but the present invention is not limited to this. The adjustment member 83 may not necessarily be provided.

(8) In the above embodiments, the inflow suppressing portion 70 includes the aspirator 33 and the outside air intake port 81, but another member may function as the inflow suppressing portion. A description will be given below with reference to FIG. 12 . First, as shown in FIG. 12, the gas in the fixed tube 100 flows from the left side (one side of the present invention) to the right side (the other side of the present invention) in the extending direction (horizontal direction) of the fixed tube 100 . A wind shielding member 96 provided to extend toward the inside of the fixed pipe 100 is arranged downstream of the connecting pipe 34 in the direction of gas discharge. The windshield member 96 is, for example, a tubular body made of a hose. Alternatively, the windshield member 96 may be made of sheet metal. The shape of the windshield member 96 is not necessarily limited to a cylindrical shape, and may be, for example, a half-cylindrical shape. In other words, the windshield member 96 should at least extend inside the fixed pipe 100 from the lower left end of the connecting pipe 34 . The windshield member 96 is arranged so as not to come into contact with the water W flowing through the fixed pipe 100 in order to ensure that the gas inside the fixed pipe 100 flows in the extending direction. The windshield member 96 as described above causes the gas in the fixed pipe 100 to flow downward (see the dashed-dotted arrow in FIG. 12), and prevents the gas from flowing into the connecting pipe 34 . Further, the windshield member 96 may, for example, extend along the up-down direction perpendicular to the left-right direction (perpendicular direction of the present invention), or may be arranged so as to be tilted to the right with respect to the up-down direction (see FIG. 12). ). As a result, compared to the structure in which the wind shield member 96 is tilted leftward with respect to the vertical direction, the gas that hits the wind shield member 96 is prevented from flowing backward to the left and heading to the right again. Therefore, it is possible to effectively suppress the flow of gas from the fixed pipe 100 into the connecting pipe 34 .

In the above configuration, the outside air intake port 81 may be formed (see FIG. 12) or may not be formed. In other words, in addition to the inflow suppressing portion 70 , the windshield member 96 may also suppress the inflow of gas from the fixed pipe 100 to the connecting pipe 34 . Alternatively, the outside air intake port 81 may not be formed, and only the windshield member 96 may suppress the inflow of gas from the fixed pipe 100 to the connecting pipe 34 . With such a configuration, there is no need to increase the output of the aspirator 33 . That is, in this case, the windshield member 96 corresponds to the inflow suppressing portion of the present invention.

(9) In the above embodiments, the suction member 31 has the suction ring 42 arranged to surround the filament f and the surrounding member 41 to which the suction ring 42 is attached. Not limited. That is, the suction member 31 does not necessarily have to be arranged so as to surround the filament f.

(10) In the above-described embodiments, the aspirator 33 is provided as an exhaust device, but the present invention is not limited to this. In addition to the aspirator 33, or instead of the aspirator 33, for example, a known blower or the like may be provided. Note that if a blower is provided instead of the aspirator 33, the water W does not flow inside the fixed pipe 100 (that is, only gas flows inside the fixed pipe 100 due to suction by the blower). Even with such a configuration, it is effective to suppress the inflow of gas from the fixed pipe 100 to the connecting pipe 34 as in the above-described embodiments.

(11) In the above-described embodiments, the spinning beam 2 spins nylon 6 as the polymer, but the present invention is not limited to this. Of course, the present invention can also be applied when other types of polymers such as nylon and polyester are spun.

1 melt spinning equipment 2 spinning beam (spinning unit)
2a spinning beam (first spinning unit)
2b spinning beam (second spinning unit)
3 Thread cooling device (cooling unit)
4 Exhaust Unit 13 Spinneret 21 Cooling Tube 30 Discharge Channel 31 Suction Member (Suction Part)
31a suction member (first suction portion)
31b suction member (second suction unit)
32 duct (duct part)
32a duct (first duct part)
32b duct (second duct part)
33 aspirator (exhaust device)
34 connecting pipe 41 enclosing member 42 suction ring 46 internal space 51 peripheral wall 52 suction port 70 inflow suppressing portion 72 water inflow portion 73 gas inflow portion 73a gas inflow portion (first gas inflow portion)
73b gas inlet (second gas inlet)
74 outflow part 81 outside air intake 81a outside air intake (first outside air intake)
81b outside air intake (second outside air intake)
83 adjustment member (adjustment part)
83a adjusting member (first adjusting part)
83b adjusting member (second adjusting part)
84 cylinder part (cover part)
96 Wind shield member (inflow suppression part)
100 Fixed tube f Filament

Claims (11)

a spinning unit having a spinneret for spinning filaments;
a cooling unit having a cooling cylinder arranged below the spinneret and cooling the filaments spun from the spinneret;
an exhaust unit disposed between the spinning unit and the cooling unit in the running direction of the filament, and having an exhaust flow path for sucking and exhausting gas generated from the filament,
The exhaust unit
a suction unit disposed between the spinneret and the cooling cylinder and having a suction port for sucking the gas;
a duct portion disposed downstream of the suction portion in a gas discharge direction in which the gas is discharged;
an exhaust device disposed on the downstream side of the duct portion in the gas exhaust direction and sucking and exhausting the gas;
a connection pipe disposed downstream of the exhaust device in the gas discharge direction and connected to a midway portion of the fixed pipe;
and an inflow suppressing portion that suppresses inflow of the gas from the fixed pipe to the connecting pipe. The exhaust device is configured to be able to change the output, and has a gas inflow part for inflowing the gas,
At least one of the gas inlet portion and the duct portion is formed with an outside air intake port for communicating between the discharge passage and a space outside the discharge passage,
2. The melt spinning equipment according to claim 1, wherein the inflow suppressing part includes the exhaust device and the outside air intake. 3. The melt spinning equipment according to claim 2, wherein the exhaust unit has a control part for controlling the opening degree of the outside air intake. The adjustment unit is
Having a cover part for covering a part of the outside air intake,
4. The area of the portion covering the outside air intake can be changed by moving the cover part along a plane including the edge of the outside air intake. Melt spinning equipment as described. 5. The melt spinning equipment according to claim 3, comprising a plurality of said exhaust units. A first spinning unit and a second spinning unit different from the first spinning unit are provided as the spinning units,
The exhaust unit
As the suction units, a first suction unit corresponding to the first spinning unit and a second suction unit corresponding to the second spinning unit;
The duct portion includes a first duct portion corresponding to the first suction portion and a second duct portion corresponding to the second suction portion,
The exhaust device has, as the gas inlets, a first gas inlet corresponding to the first duct and a second gas inlet corresponding to the second duct,
As the outside air intake ports, a first outside air intake port corresponding to the first duct portion and the first gas inlet portion, and a second outside air intake port corresponding to the second duct portion and the second gas inlet portion. a mouth and are formed,
As the adjuster, a first adjuster for adjusting the degree of opening of the first outside air intake and a second adjuster for adjusting the degree of opening of the second outside air intake are provided. The melt spinning equipment according to any one of claims 3 to 5, characterized in that The melt spinning equipment according to any one of claims 2 to 6, wherein the outside air intake port is formed in the gas inlet portion of the exhaust device. The exhaust device
a water inflow portion for inflowing water provided separately from the gas inflow portion;
The melt spinning equipment according to any one of claims 2 to 7, characterized by being an aspirator having an outflow part for discharging the gas and the water, which is connected to the connecting pipe. The inflow suppressing part is
A wind shielding member is provided on the downstream side of the connecting pipe in the gas discharging direction and extends inward of the fixed pipe to prevent the gas in the fixed pipe from flowing into the connecting pipe. The melt spinning equipment according to any one of claims 1 to 8, characterized in that: the gas is discharged from one side to the other side in the extending direction of the fixed pipe;
The windshield member is
10. The melt spinning equipment according to claim 9 , characterized in that it extends along an orthogonal direction orthogonal to said extending direction, or is arranged to be inclined with respect to said orthogonal direction to the other side in said extending direction. . The suction unit is
a suction ring disposed so as to surround filaments spun from the spinneret and having the suction port formed on a peripheral wall thereof;
an enclosing member that is connected to the exhaust device, is provided so as to surround the suction ring, and is formed with an internal space through which the gas discharged from the inside of the suction ring flows. Item 11. The melt spinning equipment according to any one of items 1 to 10 .

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