JP6259296B2 - Spinning equipment - Google Patents

Description

  The present invention relates to a spinning device for spinning multifilament yarns.

  In the melt spinning apparatus described in Patent Document 1, a yarn cooling device is provided below the spinning beam. A plurality of spinning packs are inserted into the spinning beam, a base is incorporated in the spinning pack, and a through hole is formed in the base. Then, a plurality of filaments for forming a multifilament yarn is spun downward from the through hole. The yarn cooling device includes a cooling cylinder disposed almost directly below the base. A yarn traveling space extending in the vertical direction is formed inside the cooling cylinder. A side wall of the yarn traveling space serves as a filter, and cooling air is pumped into the yarn traveling space through the filter. As a result, the plurality of filaments spun from the spinning pack are cooled by the cooling air that is pumped to the yarn traveling space when passing through the yarn traveling space of the cooling cylinder.

  In Patent Document 2, filaments having various non-circular cross-sectional shapes can be spun by spinning filaments from various non-circular nozzles (corresponding to the through holes of the cap of Patent Document 1). Have been described.

JP 2011-252260 A JP 7-268777 A

  Here, in the melt spinning apparatus described in Patent Document 1, the cross-sectional shape of the through hole of the die is a non-circular cross-sectional shape as described in Patent Document 2, so that the filament having a non-circular cross-section It is also possible to spin a multifilament yarn constituted by When a filament is spun from a non-circular through hole as described in Patent Document 2, the filament immediately after spinning has high fluidity, and due to its own surface tension before cooling and solidification. Deforms and approaches a circular cross section. For this reason, it is preferable to cool and solidify the spun filament as soon as possible in order to make the final cross-sectional shape of the filament close to the spun state.

  Here, in a melt spinning apparatus for spinning relatively thin (for example, 200 denier or less) multifilament yarn, as described in Patent Document 1, a yarn for cooling the spun filament is used. As the cooling device, a yarn cooling device provided with a cooling cylinder for blowing cooling air from the circumferential direction is also used.

  In the melt spinning apparatus described in Patent Document 1, in order to speed up the cooling of the spun filament by the cooling air, for example, it is conceivable to bring the yarn cooling device closer to the spinneret of the spinning pack. However, in the yarn cooling device, there are a portion that forms the wall on the spinning beam side of the internal space, a pressure seal member, and a heat insulating member that shuts off the heat of the high temperature spinning beam. Cooling air is not blown out from the portion formed by the member. That is, in Patent Document 1, no matter how close the yarn cooling device is to the spinning beam, the cooling cylinder is separated from the die by at least the thickness of the member.

  Alternatively, in order to accelerate the cooling of the spun filament by the cooling air, in the melt spinning apparatus described in Patent Document 1, the yarn cooling device is moved from the wall forming the yarn traveling space of the cooling cylinder to the wall. It is conceivable that the cooling air is ejected in a direction inclined toward the base with respect to the orthogonal direction. However, in this case, the cooling air hits the die and the surface temperature of the die decreases. When the surface temperature of the die is lowered, the quality of the filament spun from the through hole may be lowered.

  An object of the present invention is to spin a multifilament yarn of 200 denier or less, which can accelerate the cooling of the spun filament and does not lower the surface temperature of the die incorporated in the spin pack. It is providing the melt spinning apparatus of this.

A spinning device according to a first invention is a spinning device for spinning a multifilament yarn of 200 denier or less, and a die having a non-circular cross-sectional through hole for forming the multifilament yarn is incorporated. A spinning beam in which a spinning pack is inserted, and a cooling cylinder disposed below the spinning beam, extending in the vertical direction and pumping cooling air from the surroundings, the spinning beam and an upper end of the cooling cylinder A groove is formed between the spinning beam and the cooling cylinder, and a groove for forming the gap is formed on one of the upper surface and the lower surface. A forming member .

Since the filament having a non-circular cross section immediately after being spun from the through hole of the die has fluidity, it approaches the circular cross section by its surface tension until it is cooled and solidified. Therefore, in order to make the final cross-sectional shape of the filament close to the shape when it is spun, it is preferable to cool and solidify the spun filament as soon as possible. In the present invention, the spun filament is cooled by the outside air flowing from the gap provided between the spinning beam and the upper end of the cooling cylinder before being introduced into the cooling cylinder. Thereby, cooling of the spun filament can be accelerated, and the filament can be cooled and solidified before being deformed and approaching a circular cross section. As a result, the final cross-sectional shape of the filament can be brought close to the shape immediately after spinning.

In addition, the flow of outside air flowing from the gap between the spinning beam and the upper end of the cooling cylinder is caused by the accompanying flow generated as the filament travels. There is no flow to go. Further, the flow of air flowing in from the gap is not so high in flow velocity. Moreover, since it is external air which flows in from the said clearance gap, temperature is not so low. Therefore, the outside air flowing from the gap does not cause the yarn to sway or cool the surface of the base.

In addition, the monomer discharged from the through hole with the polymer or the polymer deteriorated by oxidation adheres to the surface of the base, and when the spinning of the filament is continued, the monomer and the oxidation deteriorate in the part around the through hole on the surface of the base. Polymers and the like are gradually deposited. In the present invention, the filament on which the monomer or the oxidatively deteriorated polymer attached to the portion around the through hole on the surface of the die is spun by the flow of outside air flowing from the gap between the spinning beam and the upper end of the cooling cylinder Drop off before growing to a size that will have an adverse effect. Thereby, the frequency of cleaning of a nozzle | cap | die can be decreased.
Further, when the vertical length of the gap for allowing the outside air to flow between the spinning beam and the upper end of the cooling cylinder changes, the amount of the outside air flowing from the gap changes. As a result, how much the filament is cooled by the outside air changes, and the final cross-sectional shape of the filament changes. Therefore, high accuracy is required for the vertical length of the gap between the spinning beam and the upper end of the cooling cylinder. In the present invention, when the groove forming member is disposed between the spinning beam and the cooling cylinder so as to contact the lower surface of the spinning beam and the upper surface of the cooling cylinder, the vertical direction is provided between the spinning beam and the upper end of the cooling cylinder. A gap for allowing the outside air to flow is formed with a length of approximately the same as the depth of the groove. Further, the groove can be formed with high accuracy by machining or the like. Therefore, in the present invention, it is possible to increase the accuracy of the vertical length of the gap between the spinning beam and the cooling cylinder.
Further, in the present invention, since the outside air is rectified by the gap formed by the groove, the flowing outside air can be stabilized. Thereby, variation in yarn quality due to fluctuations in the flow of outside air flowing in can be suppressed.

  The spinning device according to a second aspect of the invention is the spinning device according to the first aspect of the invention, wherein the gap has a length in the vertical direction of 10 mm or less.

As described above, the outside air flowing from the gap between the spinning beam and the upper end of the cooling cylinder is not so high in flow velocity or low in temperature, but if the vertical length of this gap is too large, the gap There is a risk that the surface of the base will be cooled by a large amount of outside air flowing in, or that the yarn may be shaken by the flow of outside air. In the present invention, since the length of the gap in the vertical direction is 10 mm or less, it is possible to prevent the surface of the die from being cooled or the yarn from being shaken by the outside air flowing from the gap.

According to the present invention, cooling of the spun filament can be accelerated, and the filament can be cooled and solidified before the cross-sectional shape of the filament is deformed and approaches a circular cross-section. As a result, the final cross-sectional shape of the filament can be brought close to the shape immediately after spinning. In addition, the outside air flowing from the gap does not cause the yarn to sway and the base surface does not cool. In addition, due to the flow of outside air flowing through the gap between the spinning beam and the upper end of the cooling cylinder, the monomer attached to the portion around the through hole on the surface of the die or the polymer deteriorated by oxidation has an adverse effect on the filament to be spun. Drop off before growing to a size that affects. Thereby, the frequency of cleaning of a nozzle | cap | die can be decreased.

1 is a schematic configuration diagram of a melt spinning apparatus according to an embodiment of the present invention. It is the elements on larger scale of FIG. (A) is a figure which shows an example of a nozzle | cap | die surface, (b) is a figure which shows another example of a nozzle | cap | die surface, (c) is the figure which expanded the through-hole formed in the nozzle | cap | die surface. It is the IV-IV sectional view taken on the line of FIG. It is the VV sectional view taken on the line of FIG. It is a figure which shows the cross-sectional shape of the filament which comprises a multifilament yarn. (A) is the cross section of the multifilament yarn which concerns on an Example, (b) is the cross section of the multifilament yarn which concerns on a comparative example. It is a figure equivalent to FIG. 2 in one modification. FIG. 6 is a view corresponding to FIG. 5 in another modification.

  Hereinafter, preferred embodiments of the present invention will be described.

  As shown in FIG. 1, a melt spinning apparatus 1 according to the present embodiment includes a spinning beam 2, a yarn cooling device 3, and an oil supply device 4. The melt spinning apparatus 1 is for spinning relatively thin (for example, 200 denier or less) multifilament yarn such as multifilament yarn for clothing.

  The spinning beam 2 includes a plurality of pack housings 11 as shown in FIGS. A spin pack 12 is disposed in each pack housing 11. The plurality of spin packs 12 are arranged in two rows in a staggered manner along the direction perpendicular to the paper surface of FIG. A polymer such as heat-melted polyester, which becomes the filament Y forming the multifilament yarn, is pumped to the spinning pack 12 from a pipe or the like (not shown). A base 13 is incorporated at the lower end of the spinning pack 12. The molten polymer distributed and weighed by the spinning beam 2 is pumped to the spinning pack 12 and foreign matter is removed by a filter or the like, and a plurality of through holes 13a (through holes of the present invention, see FIG. 3) ) From a plurality of filaments Y.

  As shown in FIG. 3A, the plurality of through holes 13a are arranged along a straight line. Or the some through-hole 13a may be arrange | positioned on the periphery, as shown in FIG.3 (b). Each through-hole 13a has three branch portions 13a1 that branch and extend in directions shifted from each other by 120 degrees from the central portion, as shown in FIG. When the plurality of through holes 13a are arranged in a lattice pattern as shown in FIG. 3A, all the through holes 13a1 are arranged in the same direction. On the other hand, when the plurality of through-holes 13a are arranged along a circle as shown in FIG. 3B, each through-hole 13a1 has one branching portion 13a1 out of the three branching portions 13a1. It arrange | positions so that it may face the radial direction outer side of a circle like b). Note that the through holes 13a1 may be arranged in different directions from those shown in FIGS. 3 (a) and 3 (b).

  The yarn cooling device 3 is disposed below the spinning beam 2. As shown in FIG. 4, the yarn cooling device 3 includes a plurality of cooling cylinders 21 and a cooling air supply box 22. The plurality of cooling cylinders 21 are arranged in a staggered manner corresponding to the bases 13 of the plurality of spin packs 12 and are arranged almost directly below the corresponding bases 13. The cooling cylinder 21 is a substantially cylindrical member extending in the vertical direction, and a yarn traveling space 31 having both ends in the vertical direction opened therein is formed therein. In addition, a part that forms the side wall of the yarn traveling space 31 of the cooling cylinder 21 is a filter 32. The filter 32 rectifies the cooling air flowing into the yarn traveling space 31 from a cooling cylinder housing space 41 (described later) of the cooling air supply box 22.

  The cooling air supply box 22 is for supplying cooling air to the yarn traveling space 31 of the cooling cylinder 21. The cooling air supply box 22 has a substantially rectangular parallelepiped shape, and a cooling cylinder housing space 41 is formed therein. The plurality of cooling cylinders 21 are accommodated in the cooling cylinder accommodating space 41. Sealing members 23 are provided at the upper and lower ends of each cooling cylinder 21, and the space between the yarn traveling space 31 and the cooling cylinder housing space 41 is sealed by the sealing member 23. A duct 45 is connected to the cooling cylinder housing space 41. Cooling air W <b> 1 is pumped from the duct 45 into the cooling cylinder housing space 41. The cooling air W <b> 1 pressure-fed to the cooling cylinder housing space 41 is pressure-fed through the filter 32 to the yarn traveling space 31 of the plurality of cooling cylinders 21. The filament Y traveling in the yarn traveling space 31 is cooled by the cooling air W <b> 1 pumped to the yarn traveling space 31. Here, the temperature of the cooling air W1 is, for example, about 21 to 23 ° C. when it flows into the yarn traveling space 31.

  A groove forming member 50 is disposed between the spinning beam 2 and the yarn cooling device 3. The groove forming member 50 is a plate-like member, and the upper surface thereof is in contact with the lower surface of the spinning beam 2, and the lower surface thereof is in contact with the upper surface of the yarn cooling device 3 including the upper surfaces of the plurality of cooling cylinders 21. In the groove forming member 50, a plurality of through holes 51 are formed in portions overlapping with the plurality of bases 13 and the plurality of cooling cylinders 21 in the vertical direction. As a result, the plurality of through holes 13 a of the base 13 and the yarn traveling space 31 of the cooling cylinder 21 communicate with each other through the through holes 51.

  A plurality of grooves 52 are formed on the lower surface of the groove forming member 50. The plurality of grooves 52 are arranged in the vertical direction of FIG. 5, and each extend in the horizontal direction of FIG. 1 to connect the side surface of the groove forming member 50 and the through hole 51. However, some of the grooves 52 connect portions of the plurality of through holes 51 that overlap in the left-right direction. The grooves 52 allow outside air to flow between the spinning beam 2 and the yarn cooling device 3 into the plurality of through holes 13 a formed in the base 13, the yarn traveling space 31 of the cooling cylinder 21, and the through holes 51. For this reason, a gap is formed. Here, the depth F of the groove 52 is about 2 to 3 mm. As a result, the vertical length of the gap between the spinning beam 2 and the yarn cooling device 3 for allowing the outside air to flow in is also about 2 to 3 mm, similar to the depth F of the groove 52.

  The groove forming member 50 is formed with three bolt holes 53 at both ends in the longitudinal direction (vertical direction in FIG. 5). The groove forming member 50 is joined to the spinning beam 2 or the yarn cooling device 3 by a bolt (not shown) inserted through the bolt 53.

  The oil supply device 4 is disposed below the yarn cooling device 3. The oil supply device 4 applies an oil agent to the plurality of filaments Y cooled by the yarn cooling device 3. And the some filament Y to which the oil agent was provided is entangled after that, and turns into one multifilament yarn. The multifilament yarn is wound around the bobbin by a winding device (not shown).

  In the melt spinning apparatus 1 described above, as described above, a plurality of filaments Y are spun from the through holes 13 a of the base 13, and the spun filaments Y pass through the yarn traveling space 31 of the cooling cylinder 21. When passing, it is cooled by the cooling air W <b> 1 flowing into the yarn traveling space 31. At this time, the plurality of filaments Y are spun in a cross-sectional shape substantially the same as the shape of the through-hole 13a. However, since the filament Y has fluidity immediately after spinning, the filament Y has a fluidity as shown in FIG. Until it cools and solidifies, it approaches its circular cross section by its surface tension. Here, the M value is known as an index indicating the degree of irregularity of the cross-sectional shape of the filament Y (how far from the circular cross-section). The M value is a value obtained by B / A when the inscribed circle radius of the filament Y is A and the circumscribed circle radius is B. Alternatively, the value obtained by 1- (A / B) may be the M value. And in any case, it has shown that the cross-sectional shape of the filament Y is far from a circular cross section, so that M value is large.

  As described above, the final M value of the filament Y is determined by the M value of the filament Y when it is spun from the through hole 13a and the time it takes for the spun filament Y to cool and solidify. In the melt spinning apparatus 1, in order to spin a multifilament yarn formed by a plurality of filaments Y having a cross-sectional shape with a large M value, the length of the branch portion 13a1 of the through-hole 13a is set to the length C. It is necessary that the value E divided by the width D of the branching portion 13a1 is large, or the spun filament Y needs to be cooled and solidified quickly.

  In the present embodiment, as described above, the groove forming member 50 is disposed between the spinning beam 2 and the yarn cooling device 3, and a plurality of grooves 52 are formed on the upper surface of the groove forming member 50. The outside air W <b> 2 flows into the through-hole 51 disposed above the cooling cylinder 21 through 52. Thus, the spun filament Y is cooled by the outside air W2 before being cooled by the cooling air W1. As a result, the filament Y can be cooled more quickly than when the filament Y is cooled only by the cooling air W1, and the final M value of the filament Y can be increased.

  In the present embodiment, the flow of the outside air W <b> 2 flowing into the through-hole 51 through the groove 52 is generated by the accompanying flow generated around the traveling filament Y, and therefore, the cooling cylinder 21 enters the yarn traveling space 31. The flow velocity is smaller than that of the cooling air W1 fed under pressure. The temperature of the outside air W2 is the temperature of the air on the lower surface of the hot spinning beam 2 (for example, about 40 to 50 ° C.), and the cooling air W1 pumped from the duct 45 for cooling the filament Y. The temperature is not as low as (for example, about 21 to 23 ° C.). Therefore, the filament Y thus spun is cooled and solidified first by the outside air W2 at the corners of the cross section where it is easy to cool, and then the remaining part is cooled by the cooling air W1 when traveling in the yarn traveling space 31. Solidified. Therefore, the corner portion of the final filament Y can be sharpened compared to the case where the filament Y is cooled only by the cooling air W1.

  Here, if the outside air W2 flowing into the through-hole 51 via the groove 52 has a high flow velocity and a low temperature, the filament Y is swayed by the flow of the outside air W2, or the outside air W2 that has flowed in. May reach the base 13 (a member forming the through hole 13a), and the surface of the base 13 may be cooled. Therefore, conventionally, in order to prevent these problems from occurring, it has been considered preferable to provide a hermetic seal between the spinning beam 2 and the yarn cooling device 3 without providing a gap between them. .

  However, in actuality, the outside air W2 flowing into the through hole 51 through the groove 52 is generated by an accompanying flow generated as the filament Y travels. Turn downwards that is. Therefore, the outside air W <b> 2 flowing into the through hole 51 via the groove 52 does not flow toward the surface of the base 13. Further, as described above, the outside air W2 has a lower flow velocity than the cooling air W1, and the temperature is not as low as that of the cooling air W1. Therefore, even if a gap for allowing the outside air W2 to flow in is provided between the spinning beam 2 and the yarn cooling device 3, the flowing outside air W2 causes the yarn Y to run or the surface of the base 13 is It won't get cold.

  However, if the depth F of the groove 52 is too large (the length in the vertical direction of the gap for allowing the outside air W2 to flow in is too long), the amount of the outside air W2 flowing into the through hole 51 through the groove 52 increases. . Therefore, even if the flow rate of the outside air W2 is not so large and the temperature of the outside air W2 is not so low, there is a possibility that the filament Y may be swayed or the surface of the base 13 may be cooled.

  Therefore, in the present embodiment, the depth F of the groove 52 (the vertical length of the gap for allowing the outside air W2 to flow in) is set to about 2 to 3 mm. Thereby, it is possible to reliably prevent the yarn Y from being swayed by the outside air W2 flowing in and the surface of the base 13 from being cooled.

  Further, depending on how much the filament Y is cooled by the outside air W2 (how much outside air W2 hits the filament Y), the final cross-sectional shape of the filament Y (M value, cross-sectional corner shape, etc.) Determined. Therefore, high accuracy is required for the length in the vertical direction of the gap between the spinning beam 2 and the yarn cooling device 3 for allowing outside air to flow. In the present embodiment, as described above, the groove forming member 50 is disposed between the spinning beam 2 and the yarn cooling device 3, and a plurality of grooves 52 are formed in the groove forming member 50, whereby the spinning beam 2 and the yarn are formed. A gap is formed between the cooling device 3 and the outside air. On the other hand, the groove 52 can be accurately formed by machining or the like. Therefore, the accuracy of the length in the vertical direction of the gap for allowing the outside air to flow between the spinning beam 2 and the yarn cooling device 3 can be increased.

  In the present embodiment, a plurality of grooves 52 are formed in the groove forming member 50, so that a gap for allowing outside air to flow is formed between the spinning beam 2 and the yarn cooling device 3. Therefore, the outside air W <b> 2 flowing into the through hole 51 through this gap is rectified by the groove 52. Thereby, the flow of the outside air W2 flowing into the through hole 51 is stabilized, and variation in yarn quality due to fluctuations in the flow of the outside air W2 can be suppressed.

  Further, in the spinning pack 12, foreign matter accumulates in the filtration portion for filtering the polymer with time, and as a result, yarn breakage is likely to occur in the spun filament, or the pressure inside the pack increases. Or approach the pressure resistance. Accordingly, the melt spinning apparatus 1 periodically replaces the spinning pack 12. Then, in the spinning pack 12 removed from the melt spinning apparatus 1, components such as the base 13 are reused. When the base 13 is reused, the base 13 is washed to remove the polymer and the like attached to the base 13. However, when the base 13 has the through hole 13a having the large value E, the width D of the branching portion 13a1 of the through hole 13a is narrow, and it becomes difficult to remove the polymer or the like attached in the through hole 13a. .

  On the other hand, in the present embodiment, as described above, the spun filament Y can be cooled faster than the case where it is cooled only by the cooling air W1, and the final M value of the filament Y can be increased. In the melt spinning apparatus 1, even when a multifilament yarn formed by a plurality of filaments Y having a cross-sectional shape with a large M value is spun, the through-hole with a small value of E is used. A base 13 formed with 13a can be used. In this case, since the width D of the through hole 13a is large, it is easy to remove the polymer or the like attached to the inside of the through hole 13a when the base 13 is washed.

  In the present embodiment, the monomer Y discharged from the through-hole 13a, the polymer deteriorated by oxidation, or the like adheres to the surface of the base 13 around the through-hole 13a, and the spinning of the filament Y is continued. As a result, monomers, oxidatively deteriorated polymers, and the like are gradually deposited around the through holes 13a. For this reason, it is necessary to periodically remove the monomer deposited on the surface of the base 13, the oxidatively deteriorated polymer, and the like by cleaning the base 13.

  On the other hand, in the present embodiment, a monomer or an oxidatively deteriorated polymer attached to a portion around the through hole 13a on the surface of the base 13 due to the flow of the outside air W2 flowing into the through hole 51 through the groove 52. Will fall off before growing to a size that will adversely affect the filament Y being spun. Thereby, the frequency of cleaning of the nozzle | cap | die 13 can be decreased.

  Next, examples of the present invention will be described. FIG. 7A is an example (example) of a cross section of a multifilament yarn spun by the melt spinning apparatus 1 for spinning a 150-denier multifilament yarn composed of 48 filaments Y. FIG. Table 1 shows the inscribed circle radius A, circumscribed circle radius B, and M value of the cross section of 11 filaments Y out of 48 filaments Y forming the multifilament yarn. In Table 1, No. Reference numerals 1 to 11 are numbers for distinguishing the filaments Y. Further, the M value in Table 1 is calculated by the above-mentioned B / A.

  FIG. 7B shows the same melt spinning apparatus 1 as that shown in FIG. 7A in which the multifilament yarn is spun, but a through hole 51 is formed instead of the groove forming member 50, but the groove 52 is formed. FIG. 2 is an example (comparative example) of a cross section of a multifilament yarn spun in a melt spinning apparatus in which members that are not formed are arranged. Table 2 shows the inscribed circle radius A, circumscribed circle radius B, and M value of the cross section of 11 filaments Y out of 48 filaments Y forming the multifilament yarn. In Table 2, No. Reference numerals 1 to 11 are numbers for distinguishing the filaments Y. The M value in Table 2 is also calculated by the above B / A.

  Comparing Table 1 and Table 2, it can be seen that the M value of the filament Y increases when a gap for allowing the outside air to flow between the spinning beam 2 and the yarn cooling device 3 is formed. . Further, when FIG. 7A is compared with FIG. 7B, the cross section of the filament Y is greater when the gap for allowing the outside air to flow between the spinning beam 2 and the yarn cooling device 3 is formed. It can be seen that the bulge of the side of the substantially triangular side is small (the M value is large). Further, when FIG. 7A is compared with FIG. 7B, the filament Y is more likely to be formed when a gap is formed between the spinning beam 2 and the yarn cooling device 3 to allow outside air to flow. It can be seen that the corners of the substantially triangular section are sharp.

  Next, modified examples in which various changes are made to the present embodiment will be described.

  In the above-described embodiment, the plurality of grooves 52 are formed on the lower surface of the groove forming member 50. However, the present invention is not limited to this. For example, as illustrated in FIG. 8A, a plurality of grooves 52 may be formed on the upper surface of the groove forming member 50. Alternatively, the grooves 52 may be formed on both the upper surface and the lower surface of the groove forming member 50.

  In the above-described embodiment, the plurality of grooves 52 of the groove forming member 50 extend in one direction, but the present invention is not limited to this. The plurality of grooves 52 may extend in two directions intersecting each other or in three or more directions.

  In another modification, as shown in FIG. 9, a plurality of protrusions 56 are formed on the lower surface of the groove forming member 50 so as to surround each through hole 51. Accordingly, a plurality of grooves 57 extending along the radial direction of the through hole 51 are formed between the plurality of protrusions 56 on the lower surface of the groove forming member 50. The groove forming member 50 is formed with a plurality of bolt holes 58 along the outer periphery thereof. Further, a plurality of bosses 59 are provided in a portion overlapping the bolt hole 58 on the lower surface of the groove forming member 50. The plurality of bosses 59 are substantially cylindrical members and have substantially the same height as the protrusions 56. The groove forming member 50 and the spinning beam 2 (see FIG. 2) disposed above the groove forming member 50 or the groove forming member 50 and the yarn cooling device 3 (see FIG. 2) disposed below the bolt forming hole 58 and the boss 59 are fixed by bolts (not shown). Here, the boss 59 is provided because the groove forming member 50 is deformed when the groove forming member 50 and the spinning beam 2 or the groove forming member 50 and the yarn cooling device 3 are fixed with bolts. This is to prevent it from falling out.

  Further, in the above-described embodiment, the groove forming member 50 in which the groove 52 is formed is disposed between the spinning beam 2 and the yarn cooling device 3, but this is not a limitation. For example, by arranging a spacer between the spinning beam 2 and the yarn cooling device 3, a gap is formed between the spinning beam 2 and the yarn cooling device 3 for allowing the outside air to flow according to the height of the spacer. You may make it do. Alternatively, when an operator who assembles the melt spinning apparatus 1 without arranging a spacer or the like between the spinning beam 2 and the yarn cooling device 3 fixes the spinning beam 2 and the yarn cooling device 3 with a bolt or the like. In addition, the vertical length of the gap is adjusted by adjusting the position of the spinning beam 2 and the yarn cooling device 3 while measuring the vertical length of the gap for flowing the outside air W2 between them. May be a desired length.

  In the above-described embodiment, the length in the vertical direction of the gap between the spinning beam 2 and the yarn cooling device 3 for allowing the outside air to flow is about 2 to 3 mm. However, the present invention is not limited to this. . For example, if the vertical length of the gap for flowing outside air between the spinning beam 2 and the yarn cooling device 3 is 10 mm or less, the filament Y is swayed by the flowing outside air W2 or the base 13 The surface does not get cold. Furthermore, depending on the structure of the spinning beam 2 and the yarn cooling device 3, even if the vertical length of the gap for allowing the outside air to flow between the spinning beam 2 and the yarn cooling device 3 is larger than 10 mm. Good.

  In the above-described embodiment, the upper surface and the lower surface of the groove forming member 50 are in contact with the spinning beam 2 and the yarn cooling device, respectively. However, the present invention is not limited to this. A heat insulating member may be disposed between the groove forming member 50 and the spinning beam 2 or between the groove forming member 50 and the yarn cooling device.

  Further, in the above-described embodiment, the through hole 13a of the base 13 has the three branched portions 13a1 branched in directions shifted from each other by 120 degrees from the central portion, but the shape of the through hole 13a is this. It is not limited to. The through-hole 13a may have another non-circular shape such as one in which the length and shape of the three branch portions 13a1 are different from each other, one having four or more branch portions, and a polygon. .

DESCRIPTION OF SYMBOLS 1 Melt spinning apparatus 2 Spinning beam 3 Yarn cooling apparatus 13a Through-hole 21 Cooling cylinder 50 Groove forming member 52 Groove 57 Groove

Claims (2)

A spinning device for spinning a multifilament yarn of 200 denier or less,
A spinning beam into which a spinning pack in which a die having a through hole having a non-circular cross-section for forming the multifilament yarn is incorporated, and
A cooling cylinder disposed below the spinning beam, extending in the vertical direction and pumping cooling air from the surroundings, and
Between the spinning beam and the upper end of the cooling cylinder, there is provided a gap communicating with the outside air ,
A groove forming member disposed between the spinning beam and the cooling cylinder, wherein a groove for forming the gap is formed on either one of the upper surface and the lower surface. Spinning device.   The spinning device according to claim 1, wherein the vertical length of the gap is 10 mm or less.