JP2010196219A - Method for producing extremely fine synthetic fiber comprising multiple fiber yarn, and device for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing an extremely fine synthetic fiber composed of multiple fiber yarns capable of taking the multiple fiber yarns by one spinneret, also having less unevenness in quality among fiber yarns and stable in the point of workability and operability in producing the extremely fine synthetic fiber by a melt spinning, and to provide a device for producing the same. <P>SOLUTION: The method for producing the extremely fine synthetic fiber by melting a thermoplastic resin and ring form-cooling a group of fiber yarns Y having ≥3 fiber yarns of the total number of fiber yarns ejected as a ring form from the spinneret by using a ring-formed cooling device from the outer circumference of the ejected fiber yarn group to center satisfies the following conditions (A) to (D): (A) The ejection holes 2 are arranged in one row and as a ring form, or in a plurality of rows on concentric circles. (B) The arrangement is divided by dividing bands. (C) From an optional point in an area (spinning area) containing the ejection holes within the divided arrangement on a perpendicularly downstream line, each of the fiber yarns Y ejected from the ejection hole is imparted with an oil agent. (D) The fiber yarns are imparted with the oil agent at the right angle or approximately crossing at right the angle and toward the same direction to the perpendicularly downstream line. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for producing ultrafine synthetic fibers composed of multiple yarns and a production apparatus therefor.

  In recent years, since it has a soft and excellent texture, it can be used as a material for high-value-added products such as synthetic leather, high-density fabrics, and luxury clothing. For example, the fineness of single yarn fineness is 1.2 dtex or less. There is a demand for a method for producing synthetic fibers comprising fibers. However, as the fineness of synthetic fibers (single yarn fineness) progresses, fineness spots and cross-sectional spots (hereinafter collectively referred to as “Worster spots”) and high elongation (hereinafter referred to as “toughness”). This is a very important problem because of the tendency to cause deterioration in quality and quality differences for high-order products such as thin fabrics.

  On the other hand, speeding up the take-up speed to improve productivity and improving efficiency by taking up multiple yarns per unit (multi-threading) are also important considerations from the viewpoint of cost reduction. It is.

  In other words, with respect to the production of ultra-fine synthetic fibers, Worster spots and toughness variations are small in terms of quality. In addition, it is indispensable to develop a manufacturing method and a manufacturing apparatus with good workability (easy work).

  As a result of diligent examination in view of the above situation, when the multi-thread group discharged from a single spinneret is annularly cooled, the number of yarn groups increases and the number of single yarns increases. It was found that the smaller the number, the more likely the Wooster spots and toughness variations in each yarn group to become obvious. This is because the influence of the airflow blowing by the annular cooling device and the influence of the accompanying flow by the running yarn are overlapped and are likely to be caused by the yarn swing and the spinning tension difference between the yarn groups.

  Therefore, the present inventor, as the above-mentioned countermeasure, sets the distance between each yarn group and the cooling air blowing cylinder inside the annular cooling device as a yarn path having a uniform distance along the downstream side of the cooling air blowing cylinder. It came to the conclusion that there was a need to consider regulations, that is, the arrangement of refueling nozzles.

  In general, the arrangement of the oiling nozzles is provided with oiling nozzles corresponding to the number of yarns as illustrated in Patent Document 1 and as illustrated in FIGS. The nozzles are provided in parallel so as to intersect the running yarn.

  However, for example, using the annular cooling device necessary for spinning fine single yarns such as Patent Document 2 and the above-described arrangement of oiling nozzles provided in parallel (for example, FIG. 11), multi-spun spinning was carried out. In this case, for example, as shown in FIG. 9A, the distance (P1, P2) between each yarn group and the cooling air blowing tube of the cooling device, and the incident angle (θ1) between each yarn group and each oil supply nozzle , Θ2) are different from each other, resulting in variations in cooling efficiency, polymer orientation, and differences in physical properties of the yarns.

  On the other hand, in view of the above-described contents, when paying attention to the yarn path regulation along the downstream direction side of the annular cooling air blowing cylinder, Patent Document 3 relates to one spinneret with respect to a method for spinning a plurality of polyesters with multiple spindles. When the yarns divided into four groups (yarns) or more are cooled by an annular spraying device and taken up at a high speed in the range of 3000 to 8000 m / min, the cooling property from the annular direction of the spun yarn is improved, and the intervals between the yarns In order to solve the problem of fusing and yarn swaying, as well as the uniformity of yarn quality (variation), set the annular divided converging diameter of each thread group after cooling and solidification within a specific range, and supply cooling air to the outside It is proposed to discharge efficiently.

  In this proposal, the cooling efficiency is certainly improved, and the blowing air from the ring and the accompanying airflow of the yarn are easily eliminated, and the yarn swing is suppressed. No consideration has been given to spinning including the above. In other words, the fact that each yarn is converged so as to discharge the cooling air spreading out from the bottom means that the yarn is brought into contact with the divided converging guide before refueling the running yarn. Not only is it liable to cause adverse effects such as yarn breakage, but it is not preferable from the standpoint of productivity and operability because frequent breakage of the yarn due to time-lapse guide wear and the need to replace the guide regularly or frequently.

  In Patent Document 4, an oil supply nozzle, a yarn path regulation guide, and an entanglement processing device are arranged at a position enlarged and reduced and projected in a downstream direction from a substantially central point of each spinning hole group in the spinneret, and a plurality of spinning yarn groups are arranged. There has been proposed a method in which each yarn group cooled and solidified by an annular cooling device is divided into groups and melt-spun.

  However, for example, when the yarn group discharged from the spinneret (FIG. 3A) composed of five yarn groups is cooled by the annular cooling device and then supplied, the oil supply device proposed in the same literature 4 (FIG. 12) is used. When used, since the oiling nozzles are arranged in a radial direction in an evenly spaced manner at five intervals, at the time of threading operation, on the front side (1 side in FIG. 12) and the opposite front side (2 side in FIG. 12), Since it is difficult for the operator to see the oil supply nozzle and the yarn path regulation guide, threading is difficult and the operability is hindered. In addition, there is a problem that it is difficult to observe whether it is difficult to observe or not to determine whether or not the yarn is being lubricated with respect to checking the lubrication of the running yarn during spinning.

  Further, in Patent Document 5, with respect to a spinneret in which spinning holes are divided and drilled into three or more spinning hole groups radially from the geometric center of the whole hole group in accordance with the number of spinning spindles, the discharge hole arrangement of the base is set. There are proposals that regulate

  However, there is no mention of the position of refueling in this document, and no special consideration is given.

JP 2003-13323 A JP 2004-300614 A JP-A-1-246414 JP-A-6-93509 JP-A-1-207414

  In view of the above-mentioned points, the present invention can produce a multi-thread with a single die when producing an ultrafine synthetic fiber such as polyamide or polyester having a single yarn fineness of 1.2 decitex or less by melt spinning. An object of the present invention is to provide a method and an apparatus for producing ultrafine synthetic fibers composed of multiple yarns that are small in terms of quality, operability, and operability, and that have low Worcester unevenness and toughness variation between yarns. To do.

The manufacturing method of the ultrafine synthetic fiber consisting of the multifilament of the present invention that achieves the above-described object has the following configuration (1).
(1) A group of yarns having a total number of three or more yarns melted from a thermoplastic resin and ejected in an annular shape from a spinneret is discharged using an annular cooling device provided immediately below the spinneret. A manufacturing method in which annular cooling is performed by cooling air blown from the outer peripheral side of the yarn group toward the center side of the discharged yarn group, and the following conditions (A) to (D) are satisfied: A method for producing fibers.
(A) The spinneret has a plurality of discharge holes, and the discharge holes are annular in one row or arranged concentrically in a plurality of rows.
(B) The said array is divided | segmented by the division band for dividing | segmenting for every yarn.
(C) Each of the yarns discharged from the discharge holes is provided with an oil agent on a vertical downstream line from an arbitrary point in a region (spinning area) including the discharge holes in the divided array.
(D) The yarn is applied with an oil agent perpendicularly or substantially perpendicular to the vertical downstream line in the same direction.

In the method for producing an ultrafine synthetic fiber comprising the multifilament according to the present invention, more specifically, preferably, any one of the following constitutions (2) to (4) is employed.
(2) A group of yarns having a total number of three or more yarns melted and melted in a ring shape from a spinneret is discharged using an annular cooling device provided directly under the spinneret. A manufacturing method in which annular cooling is performed by cooling air blown from the outer peripheral side of the yarn group toward the center side of the discharged yarn group, and the following (A) is satisfied: A method for producing synthetic fibers.
(A) When the spinneret is a spinneret having a plurality of discharge holes arranged concentrically in a plurality of rows, the position of each discharge hole is on a line connecting the center of the discharge hole and the center of the spinneret. Arranged so that the center of the other discharge hole does not exist.
(3) The above-mentioned (1) or (2), wherein the single yarn fineness of the yarn melted from the thermoplastic resin and discharged in an annular shape from the spinneret is 1.2 dtex or less. A method for producing synthetic fibers.
(4) The synthetic fiber according to any one of the above (1) to (3), wherein the thermoplastic resin is melted and the number of single yarns of the yarn discharged annularly from the spinneret is 36 filaments or less. Production method.
(5) It is characterized in that the yarn group discharged from the spinneret is annularly cooled, supplied with oil and entangled, and then taken up at a take-up speed of 2500 m / min or more when taken up by the first take-up roller. The manufacturing method of the synthetic fiber in any one of said (1)-(4).

Moreover, the manufacturing apparatus of the ultrafine synthetic fiber which consists of the multiple yarn of this invention which achieves the objective mentioned above has the structure of the following (6).
(6) A melt spinning apparatus and an oil agent applying apparatus that satisfy the following conditions (A) to (D), and cooling air from the outer peripheral side of the annular discharge yarn group to the center side of the discharge yarn group And an annular cooling device that blows out cooling air, and the annular cooling device is provided immediately below the spinneret.
(A) The spinneret has a plurality of discharge holes, and the discharge holes are annular in one row or arranged concentrically in a plurality of rows.
(B) The said array is divided | segmented by the division band for dividing | segmenting for every yarn.
(C) Each of the wetting oil portions of the oil agent applying device exists on the vertical downstream line from an arbitrary point in the region (spinning area) including the discharge holes in the divided array.
(D) The said thread contact oil part should be located toward the same direction at right angles or substantially orthogonal to the said vertical downstream line.

Moreover, the manufacturing method of the ultrafine synthetic fiber which consists of this multifilament of this invention, More preferably, It consists of the structure in any one of the following (7)-(8).
(7) A melt spinning device and an oil agent applying device that satisfy the following condition (A), and cooling air from the outer peripheral side of the annular discharge yarn group toward the center side of the discharge yarn group. The apparatus for producing synthetic fibers according to (6) above, wherein the annular cooling device is provided directly below the spinneret.
(A) Each of the yarn contact oil portions is disposed so as to have the same distance as the spinneret surface.
(8) A melt spinning apparatus and an oil agent applying apparatus that satisfy the following condition (A), and cooling air from the outer peripheral side of the annular discharge yarn group toward the center side of the discharge yarn group. The apparatus for producing synthetic fibers according to (7), wherein the annular cooling device is provided immediately below the spinneret.
(A) When the spinneret is a spinneret having a plurality of discharge holes arranged concentrically in a plurality of rows, the position of each discharge hole is on a line connecting the center of the discharge hole and the center of the spinneret. Arranged so that the center of the other discharge hole does not exist.

  According to the present invention, the production efficiency of ultrafine synthetic fibers such as polyamide and polyester having a single yarn fineness of 1.2 decitex or less is improved by multi-threading, and Wooster spots and toughness variations between yarns are reduced. It is possible to provide a production method and a production apparatus thereof having a small and stable quality, and to provide the production method and production apparatus having a low thread breakage, excellent operability and excellent operability.

FIG. 1 is a schematic model diagram showing an embodiment of a method and an apparatus for producing an ultrafine synthetic fiber comprising a multifilament according to the present invention, in particular, an oil supply section. FIG. 1A is a top model view of the oil supply section, FIG. 1B is a front model view of the oil supply section, and FIG. 1C is a side model view of the oil supply section. Fig.2 (a) is a schematic process drawing which shows one embodiment of the manufacturing method and manufacturing apparatus of the ultrafine synthetic fiber which consists of the multiple yarn of this invention. FIG. 2B and FIG. 2C are schematic model diagrams showing the spinneret and the annular cooling device. FIG. 3 is a schematic model diagram showing one embodiment (five yarns, two annular rows) of the spinneret used in the method and apparatus for producing ultrafine synthetic fibers composed of the multiple yarns of the present invention, and FIG. ) Is a front model diagram of the spinneret, and FIG. 3B is a side model diagram. FIG. 4 is a schematic model diagram showing an embodiment (five yarns, annular one row) of the spinneret of the method and apparatus for producing ultrafine synthetic fibers comprising the multi-yarn of the present invention. FIG. 5 is a schematic model diagram showing one embodiment (five yarns, three annular rows) of the spinneret of the ultrafine synthetic fiber manufacturing method and manufacturing apparatus of the present invention. FIG. 6 is a schematic model diagram showing a discharge hole arrangement of a conventional spinneret and additionally showing a flow of cooling air during spinning. FIG. 7 shows the spinning area for one yarn of the spinneret of the present invention, and FIGS. 7 (a) to (d) show the spinning area for one yarn as described above. It is a schematic model diagram showing an embodiment showing the arrangement of discharge holes. 8 (a) and 8 (b) are schematic model diagrams showing one embodiment of the divided band width W and the spinning area X in the spinneret of the present invention. FIG. 9 is a schematic model diagram for explaining each parameter used in the present invention. FIG. 10A is a schematic model diagram showing one embodiment of the spinneret used in the present invention (6 (yarn / spinneret)), and FIGS. 10B and 10C respectively show the spinneret. It is a schematic model figure of the upper surface and front of a fueling part corresponding to a nozzle. FIG. 11 is a schematic model showing one embodiment of a conventional general oil supply unit, FIG. 11 (a) is a front model view of the oil supply unit, and FIG. 11 (b) is a side model of the oil supply unit. FIG. 11 and FIG. 11C are upper surface model views of the oil supply section. FIG. 12 is a schematic model view of an upper surface showing an embodiment of a conventional oil supply unit.

  Hereinafter, the production method and production apparatus for the ultrafine synthetic fiber comprising the multi-thread of the present invention will be described in more detail.

The production method of the present invention includes a melt spinning device and an oil agent applying device that satisfy the following conditions (A) to (D), and cooling air from the outer peripheral side of the annular discharge yarn group. An annular cooling device that blows cooling air toward the center, and the annular cooling device is provided directly below the spinneret, and uses a synthetic fiber manufacturing apparatus, and the total number of yarns is A group of three or more yarns is melt-spun and manufactured.
(A) The spinneret has a plurality of discharge holes, and the discharge holes are annular in one row or arranged concentrically in a plurality of rows.
(B) The said array is divided | segmented by the division band for dividing | segmenting for every yarn.
(C) Each of the oil contact devices of the oil application device exists on the vertical downstream line from an arbitrary point in the region (spinning area) including the discharge holes in the divided array.
(D) The said thread contact oil part should be located toward the same direction at right angles or substantially orthogonal to the said vertical downstream line.

  The melt spinning apparatus and the oil agent applying apparatus used in the present invention have the characteristics (A) to (D) described above, which will be described below. FIG. 3A is a schematic model cross-sectional view showing an embodiment (5 yarns / spinner) of a spinneret of the synthetic fiber manufacturing apparatus of the present invention, and FIG. 3B is a cross-sectional view of FIG. FIG. 2 is a schematic model side view showing a cross-sectional view of the side of the nozzle, and a discharge hole 2 provided in the spinneret 3 is a hole for finally extruding and discharging a molten thermoplastic resin.

  Regarding the arrangement when a plurality of discharge holes 2 are provided, in the case of one row, they are arranged in a ring shape, that is, on the circumference as shown in FIG. 4 (this figure shows the case of 5 (yarn / spinner)) In the case of a plurality of rows, for example, as shown in FIG. 3A (this figure shows the case of 5 (yarn / spinner)), the discharge holes 2 are arranged on each concentric circumference. Is. Among them, a plurality of rows are preferable. This is because the arrangement of the discharge holes in a plurality of rows can increase the number of filaments, that is, increase the number of filaments per yarn, rather than arranging the discharge holes in a single row.

  In addition, in the case of a spinneret having a plurality of discharge holes 2 arranged concentrically on a plurality of rows, the arrangement position of the discharge holes 2 forming the inner ring row is an annular row outside one of the ring rows. In relation to the arrangement positions of the discharge holes, the positions of the discharge holes are preferably arranged such that no other discharge holes exist on the line connecting the center of the discharge holes and the center of the spinneret. .

  For example, as shown in FIG. 5, when three or more rows of discharge holes 2 are arranged (this figure shows the case of 4 (yarn / spinner)), the position of the discharge holes 2 is 1 More preferably, the center of the other discharge hole does not exist on the line connecting the center of one discharge hole and the center of the spinneret. As shown in FIG. 6, when the center of the discharge hole 2 is arranged on the above line, the cooling air A from the annular cooling device is not uniformly blown to each single yarn spun from the discharge hole 2, A difference in the rectification effect is likely to occur between the yarns arranged on the outer periphery and the yarns on the inner side of the arrangement, and contact and fusion due to yarn swinging are likely to occur. This is because the deterioration and the variation tend to increase. That is, as described above, as shown in FIGS. 3 (a), 5 and 7 (a) to (d), the arrangement of the discharge holes is different from the center of each discharge hole and the center of the spinneret on the line. It is preferable that the center of the discharge hole does not exist. Further, as shown in FIGS. 7C and 7D, it is more preferable that the outer periphery of the other discharge hole is in contact with the line. However, as shown in FIG. 7B, it is most preferable that no other discharge hole exists on the line.

  In the spinneret used in the present invention, the discharge hole array is further divided by a dividing band for dividing each yarn. Here, the dividing band has a width (W) transversely toward the center point of the spinneret as shown by, for example, a two-dot chain line in FIGS. 3 (a), 4, 8 (a), and (b). It is the divided band (Z) that it has. Then, as shown in FIGS. 8A and 8B, the divided band width W passes through the centers of the two discharge holes that are closest to each other across the divided band Z in two adjacent spinning areas X, and This is the width of the parallel line when two parallel lines passing through the center of the spinneret are assumed. The dividing band width W (mm) is preferably 5 ≦ W ≦ 15 (mm). This is because the split band not only divides the spinning area so as to correspond to multiple yarns, but also distinguishes each yarn group discharged from the spinning area, for example, when threading to the oil supply nozzle 71, each yarn This is because it is also suitable for smoothly dividing the group of stripes in a short time without any obstacles.

  Further, the number of the spinning areas X divided by the dividing band Z is the same as the number of the yarns in the spinneret, and when the melt spinning is performed from one spinneret, the yarns spun from the respective spinning areas X are respectively It is operated to form one yarn. For example, as shown in FIG. 8, if there are three division bands Z, the region (spinning area X, in the frame) including the discharge holes in the array divided by the division bands Z in the spinneret is divided into three. 3 yarns (/ spinneret). In addition, in the present invention, the term “multi-yarn” means three or more yarns per one spinneret.

  Here, as shown in FIG. 8 (b), the spinning area refers to the separation zone Z arranged on the outermost peripheral side when the discharge holes of the spinneret are arranged in one or more rows on a concentric circle. This is a portion that surrounds the outer peripheral side of the discharge hole closest to the discharge hole and the outer peripheral side of the discharge hole closest to the separation zone Z arranged on the innermost peripheral side, and surrounds the outer peripheral side of the discharge hole.

  Each yarn group discharged from the spinning area X is spun in the vertical direction from an arbitrary point in the spinning area X, and is lubricated after annular cooling. In the present invention, in order to suppress Wooster unevenness and toughness variation between the yarn groups, an oil supply discharge hole of the oil supply nozzle exists on the vertical downstream line from an arbitrary point in each spinning area X. The group needs to be refueled. As described above, by spinning the spun yarn vertically, the horizontal distance (P) between each yarn group and the cooling air blowing cylinder inside the annular cooling device is: By setting the uniform distance along the downstream side of the cooling air blowing tube, not only can the cooling in the running direction of each yarn be uniform, but also the lubrication of the oil nozzle from the spinneret between each yarn. This is because the distance between the discharge holes is the same, so that the degree of progress of the oriented crystals of the yarn is made uniform, and the toughness variation can be suppressed. Furthermore, since each yarn is spun in the vertical downstream direction to the oil supply discharge hole, it is possible to pass through the oil supply nozzle without any need to install a converging guide, resulting in yarn fluff, sagging, single yarn breakage, etc. There is no adverse effect. Although it is possible to install a focusing guide as desired, it is preferable to set it within a range in which the above-described adverse effects are not exhibited.

  Here, the spun yarn spun from the spinneret is supplied on the vertical downstream line from an arbitrary point in the spinning area X as described above. As a result, the trajectory drawn until the spun yarn spun from the discharge hole in the spinning area X reaches the oil supply portion (the yarn contact oil portion of the oil supply nozzle) is perpendicular to the base surface. In particular, the position of the oil supply part is selected so that the distribution of the travel distance until each single yarn discharged from the spinning area reaches the oil supply part, specifically, the discharge hole group in the spinning area. It is preferable to be on the vertical downstream line from the center of the spinning area, that is, from the center of the spinning area. In addition, it is preferable to provide an oil supply portion at a position where the distribution of the travel distance of each single yarn in the yarn is the same between the yarns in terms of minimizing the quality variation between the yarns. . Specifically, it is preferable that the positional relationship between the yarn feeding portions of the respective yarns and the corresponding spinning areas is the same or is in the position of the palm. Most preferably, each oil supply section is located on the vertical downstream line of the center of the corresponding spinning area.

  The distance (P) between each yarn group and the cooling air blowing tube inside the annular cooling device has a uniform distance along the cooling blowing tube direction as shown in FIG. 9B. Is preferred. In other words, it is important that P has a substantially constant value. Among them, it is preferable that 5 ≦ P ≦ 20 (mm). In other words, the P is preferably a constant value within a range of 5 ≦ P ≦ 20 (mm). When the length is less than 5 (mm), the yarn comes into contact with the cooling blow tube at the time of yarn separation or threading, and the operability becomes complicated. On the other hand, if it exceeds 20 (mm), not only the cooling efficiency of the yarn is deteriorated, but if the cooling blowout air speed is improved to compensate for the efficiency, the yarn is likely to sway and the Wooster spot value is Because it becomes extremely bad.

  As for the arrangement of the oil supply nozzles, as shown in FIGS. 1A, 1B, and 1C, and as described above, each yarn group (spinning) arranged concentrically in an annular direction in the spinneret. It is preferably orthogonal or substantially orthogonal to the vertical downstream line from an arbitrary part in area X), and the oil supply nozzle and the oil supply discharge hole or the yarn contact oil part are parallel to the spinneret lower surface and the horizontal plane in the same direction. It is important to apply oil to each yarn. By arranging the oil supply nozzle and the oil supply discharge hole or the thread contact oil part in parallel in the same direction in this position, the operator can divide each yarn group consisting of multiple yarns into yarns, When threading the presser guide, threading can be performed smoothly in a short time, and it is possible to easily check the oil application on the running yarn during long-term production.

  Further, as shown in FIG. 9 (b), the distance Ho between the arranged oil supply nozzles (yarn contacting oil portions) and the spinneret becomes excessive as the single yarn fineness decreases and the number of single yarns increases. In consideration of suppression of tension, reduction in the number of yarn breaks, and yarn temperature, 600 ≦ Ho ≦ 1200 (mm) is preferable, and 800 ≦ Ho ≦ 1000 (mm) is more preferable. When the distance Ho is less than 600 (mm), an oil supply nozzle is arranged immediately below the annular cooling device, and the yarn separation and yarn hooking properties are remarkably deteriorated, and the yarn temperature is not fully cooled. Since it is refueled, it will adversely affect toughness. On the other hand, when it exceeds 1200 (mm), as described above, the number of yarn breaks tends to increase with the occurrence of excessive spinning tension, which is not preferable for operation.

  On the other hand, in the present invention, an annular cooling device is provided immediately below the spinneret. The annular cooling device blows cooling air from the outer peripheral side of the discharge yarn group of the spinneret in the annular shape toward the center side of the discharge yarn group. The cooling air blown out from the annular cooling device is not particularly restricted, but it is preferable to blow a uniform air volume in the circumferential (annular) direction perpendicularly, substantially perpendicularly, or downwardly to the discharge yarn group.

  In addition, the speed of the cooling air blown from the cooling air blowing tube is preferably in the range of 0.05 to 1.0 (m / sec) at the maximum in a section of 100 (mm) from the upper end surface of the cooling air blowing tube. . When the cooling air speed is less than 0.05 (m / sec), the cooling of each yarn becomes insufficient, and the Wooster value and the toughness value may be deteriorated. There is a possibility that the yarn discharged from the spinneret will sway and the Wooster value and the yarn forming property will deteriorate.

  As shown in FIG. 9B, the vertical distance Hq between the discharge surface of the spinneret and the upper end of the cooling air blowing portion is preferably in the range of 10 ≦ Hq ≦ 100 (mm). When the vertical distance Hq is less than 10 (mm), each yarn blows cooling air to the discharge surface of the spinneret, so that the fiber yarn discharged from the spinneret sways directly under the spinneret and the Wooster value is In addition to the deterioration, there is a possibility that the spinning tension becomes high due to the influence of the accompanying air flow accompanying the running of the fiber yarn, and the spinning property is deteriorated. On the other hand, if it exceeds 100 (mm), the yarn may solidify and the Wooster value may deteriorate. A more preferable range of the vertical distance Hq is 30 ≦ Hq ≦ 65 (mm).

  In addition, in the present invention, as shown in FIG. 2B, a steam jetting device 5 is further provided directly below the spinneret and above the annular cooling device, and directed toward the spinneret surface from which the yarn is discharged. Thus, the steam S can be ejected. In particular, when nylon is used as the thermoplastic resin, by blowing steam toward the spinneret surface, the oxygen concentration immediately below the spinneret can be reduced, and the generation of oxides can be suppressed. Since the atmospheric temperature can be properly maintained over a long period of time, it is effective during melt spinning because the operability such as reduction of yarn breakage and extension of the base correction period is improved. Further, when the steam is ejected toward the spinneret surface, it is preferable that the steam S is ejected from the annular ejection port. This is for spraying steam uniformly on the spinneret having a circular shape from the circumferential direction of the spinneret.

  On the other hand, when using polyester, for example, as shown in FIG. 2 (c), it is possible to perform spinning with good operability in the same manner by spinning the pack 21 holding the spinneret and the annular cooling device. is there.

  Thus, the yarn group discharged from the spinneret is subjected to an entanglement process after annular cooling and oiling, and is wound up through a take-up roll.

  Hereinafter, preferred examples of the production apparatus used in the present invention will be described. An apparatus 1 for producing ultrafine synthetic fibers composed of multiple yarns preferably used in the present invention is as shown in FIG. 2 (a), and is concentrically as shown in the schematic model cross-sectional views of FIGS. A spinning nozzle 3 having a number of discharge holes 2 arranged in a row or a plurality of rows in a ring, and a steam ejection device 4 having a steam ejection port 4 that ejects steam S directly below the spinning nozzle 3 toward the spinning nozzle surface. 5. An annular cooling device 6 that is arranged below the steam ejection device 5 and blows the cooling air A from the outer peripheral side of the annular discharge yarn group Y toward the center side of the discharge yarn group Y. After cooling each yarn Y, the distance (P) between each yarn group Y and the cooling air blowing tube 61 inside the annular cooling device is set to a uniform distance along the downstream side of the cooling air blowing tube 61. As shown in FIG. 1, the oil supply nozzle 71 and the oil supply discharge hole 72, It allowed the oil discharge direction of Itoyu portion 73 so as to be perpendicular to the running yarn, and is made of a fueling nozzle unit (oiling device) 7 is arranged in parallel in the same direction. Thereafter, the yarn is entangled by the entanglement processing device 9 via the yarn path regulation guide 8 immediately below the oil supply nozzle 71, and passed to the winder 12 via the first take-up roller 10 and the second take-up roller 11. Rolled up.

  In the production method of the present invention, when the yarn group discharged from the spinneret 3 is pulled by the first take-up roller 10 after the discharge, the single yarn fineness becomes a fiber yarn of 1.2 decitex or less. Thus, the effect of the present invention is more remarkably exhibited when stretching and take-up are performed. More preferably, it is a case of an ultrafine synthetic fiber having a single yarn fineness of 1.0 dtex or less, more preferably 0.5 to 0.8 dtex. The number of single yarns per yarn is preferably 36 filaments or less, more preferably 12 to 24 filaments. In addition, the total number of yarns per spinneret is particularly effective when the number of yarns is 3 or more, but the effect is further exhibited with 4 to 8 yarns. When the number of yarns is eight or more, there may be restrictions on the design of the size of the spinneret and the pitch between the discharge holes in the nozzle, or equipment restrictions such as a winder.

  By adopting such a configuration, a synthetic fiber having practical mechanical properties can be manufactured by the most rational process. Further, when the yarn group discharged from the spinneret 3 is pulled by the first take-up roller 10 after the discharge, the take-up speed is 2500 (m / min) or more, preferably 3000 (m / min) or more, Taking up at 5000 (m / min) or less is preferable in terms of cost and stable production because it is possible to cope with higher speeds in addition to making multiple yarns.

  The synthetic fiber production method of the present invention is preferably applicable to polyamide fibers, polyester fibers and the like. In particular, since the effect of the present invention is remarkable, it is effective in the polyamide fiber using the production apparatus shown in FIG. 2 and FIG. The polyamide fiber is not particularly limited, but polycaprolactam (nylon 6) fiber and polyhexamethylene adipamide (nylon 66) fiber are preferable. Moreover, you may provide the functional agent which provides functions, such as moisture absorption, an antibacterial, and a mat, to these fibers, Furthermore, additives, such as a yarn-making improvement, may be provided.

  According to the method and apparatus for producing ultrafine synthetic fibers comprising these multifilaments of the present invention, it is possible to improve the production efficiency in the multifilament take-up, and to reduce the variation of Wooster spots and toughness between the yarns. It is possible to provide a manufacturing method having high quality and good operability and a manufacturing apparatus therefor. The same effect can be obtained not only in the case of manufacturing yarns made of ordinary round cross-section fibers but also in the case of manufacturing fiber yarns made of irregular cross-section fibers. Here, the irregular cross-section fiber has, for example, a non-circular cross section such as a Y-shaped or T-shaped, C-shaped, flat-shaped cross section, or a hollow cross section.

  Hereinafter, an Example is given and the manufacturing method of the ultrafine synthetic fiber which consists of the multifilament of this invention, and its manufacturing apparatus are demonstrated more concretely. The characteristic values in the examples and comparative examples were determined by the following method, paying attention to Wooster spots between the yarns, variations in toughness values, and the number of yarn breaks. Moreover, about the fineness measurement, it measured according to JISL1013-1999 8.3.1 fineness fine quantity fineness A method.

[Variation evaluation]
The yarn obtained by the production method and production apparatus of the present invention is selected according to the number of yarns of the spinneret. And the Wooster spot and toughness value of each yarn were measured 5 times with the same yarn by the following evaluation method, and the average value (Rx) and standard deviation (Rstd) were calculated. The standard deviation was calculated from unbiased variance. Then, Rcv was calculated from the relational expression of Rcv = Rstd / Rx × 100 (%), and the variation was evaluated in four stages. △ or more was accepted.
A: “Excellent” (Rcv = less than ˜2%)
○: “Excellent” (Rcv = 2 to less than 4%)
Δ: “Good” (Rcv = less than 4-6%)
X: “Inferior” (Rcv = 6% to)

[Worcester spots]
Fineness in the fiber length direction was measured with 8 samples using Zellerwester Uster USTER TESTER III with a sample length of 300 (m) and a measurement yarn speed of 100 (m / min) at a setting of 12.5% HI. The fluctuation state (UH% value) of the plaque was determined. In the present invention, less than 1% is desirable.

[Toughness]
Tensile strength (strength) and elongation (elongation) were measured according to Section 8.5 of JIS L1013 (1999). In addition, as measurement conditions, a constant-speed tension type tester (Tensilon manufactured by Orientec Co., Ltd.) was used, and the grip interval was 50 (cm) and the tensile speed was 50 (cm / min).

Based on the strength and elongation, toughness was calculated by the following formula.
Toughness = strength (cN / dtex) × (elongation (%)) ^1/2

[Thread break]
When melt spinning, a prototype amount of 3 tons was collected, the number of yarn breaks (times / ton) was measured, evaluated in 4 stages, and Δ or more was regarded as acceptable.
A: “Excellent” (less than ~ 2.0 (times / ton))
○: “Excellent” (less than 2.0 to 3.0 (times / ton))
Δ: “Good” (less than 3.0 to 5.0 (times / ton))
×: “Inferior” (5.0 (times / ton) to)

[Comprehensive evaluation]
For comprehensive evaluation, based on the above Wooster spot variation (RcvU), toughness variation (RcvT), and yarn breakage evaluation results, the one with the lower evaluation in any of the above results was adopted as the result of comprehensive evaluation.
A: “Adoptable and excellent”
○: “Adoptable”
×: “Inferior, not available”

(Examples 1-6, Comparative Example 1)
1, 2 (a), and (b), the annular, one, two, or three rows of discharge holes shown in FIGS. 3, 4, and 5 are arranged concentrically (annular) In the case of two rows and three rows, the positions of the discharge holes are arranged such that the center of the other discharge hole does not exist on the line connecting the center of the discharge hole and the center of the spinneret), and The number of spinning areas is divided into 5 and the separation band width W is set to 10 (mm) to produce each of 5 (yarn / spinneret) spinneret, and the conventional oiling arrangement shown in FIG. 9 (hereinafter referred to as a plane arrangement). ) And the above-described arbitrary discharge hole of the present invention perpendicular to the vertical downstream line shape, and the oil supply nozzle, the oil supply discharge hole, and the yarn contact oil part are parallel to the spinneret lower surface and the horizontal plane in the same direction. The arranged oil supply array (hereinafter referred to as a stepped array) was subjected to a spinning test, and the above-mentioned variation evaluation was performed. The results are shown in Table 1.

  As test contents, nylon 6 (98% sulfuric acid relative viscosity 2.8 chip, melting temperature 280 ° C.), nylon 66 (98% sulfuric acid relative viscosity 2.8 chip, melting temperature 290 ° C.) polymer was melted, After discharging from the spinneret 3, the steam S is uniformly sprayed onto the spinneret surface by the annular jet port using the steam jet device 5, the cooling start distance (Hq) is 30 (mm), the average cooling wind speed (on the cooling blower cylinder) Annular cooling in which the average wind speed in the section of 100 (mm) from the end face is 0.35 (m / s), and the distance (P) between each yarn and the annular cooling air blowing cylinder is 7.5 (mm). The yarn is cooled by the device 6, and the entanglement processing device 9 is used to perform the entanglement processing using the oil supply device (stepped oil supply arrangement) of the present invention having a spinneret 3 and a distance (Ho) of 800 (mm), Take-up speed 2500 at the first take-up roller 10 As m / min), to obtain a polyamide fiber yarns for each cultivar. The 98% sulfuric acid relative viscosity and the intrinsic viscosity were measured by the following methods.

[98% sulfuric acid relative viscosity]
(A) A sample is weighed and dissolved in 98% by weight concentrated sulfuric acid so that the sample concentration (C) is 1 g / 100 ml.
(B) The solution (a) is measured for the number of seconds (T1) dropped at 25 ° C. using an Ostwald viscometer.
(C) The falling seconds (T2) at 25 ° C. of 98 wt% concentrated sulfuric acid in which the sample is not dissolved are measured in the same manner as in the item (2).
(D) The 98% sulfuric acid relative viscosity (ηr) of the sample is calculated by the following equation. The measurement temperature is 25 ° C.
(Ηr) = (T1 / T2) + {1.891 × (1.000−C)}.

[Intrinsic viscosity]
A sample polymer was dissolved in orthochlorophenol, and a plurality of relative viscosities ηr were obtained using an Ostwald viscometer at a temperature of 25 ° C., and extrapolated to infinite dilution.

  As can be seen from Table 1, according to the production apparatus of the present invention, the effect of suppressing the Worcester and toughness variation was remarkable as compared with the production apparatus having the conventional planar oil supply arrangement, and the yarn breakage was good.

(Examples 7 to 9)
2 (a), FIG. 2 (b), and FIG. 10, the annular two rows of discharge holes are concentrically arranged (the positions of the discharge holes are the center of the discharge holes and the spinning direction). 6) (the yarn is arranged so that the center of the other discharge hole does not exist on the line connecting the centers of the caps), and the number of spinning areas is divided into 6 and the separation band width W is 7.5 (mm). / Spindle) was manufactured, and using the stepped oil supply arrangement of the present invention, the take-up speed was changed and the above-mentioned variation evaluation was performed. In addition, as a test content, nylon 6 (a chip of 98% sulfuric acid relative viscosity 2.8, melting temperature 280 ° C.) is melted, discharged from the spinneret 3, and then discharged from an annular injection port using a vapor injection device 5. Steam S is sprayed uniformly on the spinneret surface, the cooling start distance (Hq) is 70 (mm), and the average cooling wind speed (average wind speed in the section of 100 (mm) from the upper end surface of the cooling blow cylinder) is 0.8 (m / S), the yarn is cooled by the annular cooling device 6 having a distance (P) between each yarn and the annular cooling air blowing cylinder of 20 (mm), and the distance (Ho) from the spinneret 3 is 1200 (mm). ) And spun as 24 dtex 22 filaments.

(Examples 10 to 13)
2 (a), FIG. 2 (c), and FIG. 10, the annular two rows of discharge holes are concentrically arranged (the positions of the discharge holes are the center of the discharge holes). The center of the other discharge hole is arranged on the line connecting the centers of the spinneret), and the number of spinning areas is divided into 6 and the separation band width W is 10 (mm). The spinneret of the spinneret) was manufactured, and the variation evaluation due to the influence of the distance Ho between the arranged fueling nozzles and the spinneret was performed using the stepped fueling array of the present invention.

  The test content was as follows: polyester (IV = 0.63 (intrinsic viscosity in orthochlorophenol solution, melting temperature 290 ° C.) polymer was melted and discharged from the spinneret 3, and the cooling start distance (Hq) was 50 ( mm), the average cooling wind speed (average wind speed in the section of 100 (mm) from the upper end surface of the cooling blowing cylinder) is 0.5 (m / s), and the distance between each yarn and the annular cooling wind blowing cylinder (P) The filament was cooled by an annular cooling device 6 having a diameter of 12.5 (mm), and a 24 dtex 20 filament was spun at a take-up speed of 3000 (m / min).

1: Manufacturing apparatus for ultra-fine synthetic fibers composed of multiple yarns 2: Discharge hole 21: Pack 3: Spinneret 4: Steam injection port 5: Steam injection device 6: Annular cooling device 61: Cooling air blowing cylinder 7: Refueling nozzle unit (Oil agent applicator)
71: Oil supply nozzle 72: Oil supply discharge hole 73: Yarn contact portion 8: Yarn path regulation guide 9: Entanglement processing device 10: First take-up roller 11: Second take-up roller 12: Winder Y: Yarn S: Steam A : Cooling air W: Divided belt width X: Spinning area Z: Separation belt P: Distance between yarn Y and cooling air blowing cylinder θ: Incident angle between yarn Y and oil supply nozzle Ho: Between oil supply nozzle and spinneret Distance Hq: Vertical distance between the discharge surface of the spinneret and the upper end of the cooling air outlet

Claims (8)

A yarn group having a total number of three or more yarns discharged from the spinneret in an annular shape after melting the thermoplastic resin is removed from the discharged yarn group using an annular cooling device provided immediately below the spinneret. A method for producing a synthetic fiber, characterized in that it is annularly cooled by cooling air blown from the outer peripheral side toward the center side of the discharged yarn group, and satisfies the following conditions (A) to (D) .
(A) The spinneret has a plurality of discharge holes, and the discharge holes are annular in one row or arranged concentrically in a plurality of rows.
(B) The said array is divided | segmented by the division band for dividing | segmenting for every yarn.
(C) Each of the yarns discharged from the discharge holes is provided with an oil agent on a vertical downstream line from an arbitrary point in a region (spinning area) including the discharge holes in the divided array.
(D) The yarn is applied with an oil agent perpendicularly or substantially perpendicular to the vertical downstream line in the same direction. A yarn group in which a thermoplastic resin is melted and discharged from the spinneret in a ring shape and the total number of yarns is three yarns or more is discharged to the discharge yarn group using an annular cooling device provided directly below the spinneret. 2. The production method of synthetic fiber according to claim 1, wherein the production method comprises annular cooling with cooling air blown from the outer peripheral side toward the center side of the discharged yarn group, and satisfies the following (A): Method.
(A) When the spinneret is a spinneret having a plurality of discharge holes arranged concentrically in a plurality of rows, the position of each discharge hole is on a line connecting the center of the discharge hole and the center of the spinneret. Arranged so that the center of the other discharge hole does not exist.   The method for producing a synthetic fiber according to any one of claims 1 and 2, wherein the single yarn fineness of the yarn melted from the thermoplastic resin and discharged in a ring shape from the spinneret is 1.2 dtex or less.   The method for producing a synthetic fiber according to any one of claims 1 to 3, wherein the number of single yarns of the yarn melted from the thermoplastic resin and annularly discharged from the spinneret is 36 filaments or less. 2. The yarn group discharged from the spinneret is annularly cooled, lubricated, and entangled, and then taken up at the take-up speed of 2500 m / min or more when taken up by the first take-up roller. The manufacturing method of the synthetic fiber in any one of -4. A melt spinning apparatus and an oil agent applying apparatus that satisfy the following conditions (A) to (D), and cooling air from the outer periphery side of the annular discharge yarn group toward the center side of the discharge yarn group An apparatus for producing a synthetic fiber, characterized in that the annular cooling device is provided immediately below the spinneret.
(A) The spinneret has a plurality of discharge holes, and the discharge holes are annular in one row or arranged concentrically in a plurality of rows.
(B) The said array is divided | segmented by the division band for dividing | segmenting for every yarn.
(C) Each of the oil contact devices of the oil application device exists on the vertical downstream line from an arbitrary point in the region (spinning area) including the discharge holes in the divided array.
(D) The said thread contact oil part should be located toward the same direction at right angles or substantially orthogonal to the said vertical downstream line. A melt spinning apparatus and an oil agent applying apparatus that satisfy the following condition (A), and annular cooling that blows cooling air from the outer peripheral side of the annular discharge yarn group toward the center side of the discharge yarn group The apparatus for producing a synthetic fiber according to claim 6, wherein the annular cooling device is provided immediately below the spinneret.
(A) Each of the yarn contact oil portions is disposed so as to have the same distance as the spinneret surface. A melt spinning apparatus and an oil agent applying apparatus that satisfy the following condition (A), and annular cooling that blows cooling air from the outer peripheral side of the annular discharge yarn group toward the center side of the discharge yarn group The apparatus for producing a synthetic fiber according to claim 6, wherein the annular cooling device is provided immediately below the spinneret.
(A) When the spinneret is a spinneret having a plurality of discharge holes arranged concentrically in a plurality of rows, the position of each discharge hole is on a line connecting the center of the discharge hole and the center of the spinneret. Arranged so that the center of the other discharge hole does not exist.

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