JP5262038B2 - Thermoplastic fiber manufacturing method and manufacturing apparatus thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for efficient melt spinning of a thermoplastic fiber by using a melt spinneret that has a small Uster unevenness of each yarn group by uniformly cooling each single filament and enables multi-yarn taking off with one spinneret in producing a thermoplastic fiber by a melt spinning method and a method for producing the same. <P>SOLUTION: A yarn group of total 2-8 yarn is produced by melt-spinning by using a production apparatus of a thermoplastic fiber, which has a spinneret in which a plurality of discharge inlet holes are arranged, the intervals and arrangements in the radial direction of the inlet holes are controlled and the existence areas of the discharge inlet holes are provided and a ring-shaped cooling device that blows out cooling air from the outer peripheral side of a discharge yarn group in a ring shape to the center of the discharge yarn group and is installed immediately under the spinneret. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a method for producing a thermoplastic fiber 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 decitex or less. There is a demand for a method for producing thermoplastic fibers comprising fibers. However, as the thermoplastic fibers become finer (single yarn fineness), each yarn group discharged from the spinneret immediately solidifies in the vicinity immediately below the spinneret. And fineness spots, or cross-sectional spots (hereinafter collectively referred to as “Wooster spots”), the quality tends to deteriorate or vary, which is a problem.

  In order to solve the above problems, many countermeasures and means have been made such as blowing cooling air before each single yarn discharged from the spinneret solidifies. In Patent Document 1, the distance between the spinneret surface and the upper end surface of the cooling air blowing portion is regulated, and cooling air is blown downward from the perpendicular direction to the traveling yarn so as to surround the traveling yarn. Proposals have been made.

  Thus, it is very important to spin the ultrafine fibers stably without deteriorating the Wooster spots. However, on the other hand, it is necessary to examine from the viewpoint of cost reduction measures to increase the take-up speed in order to improve productivity and to deal with a plurality of yarn take-up (multi-yarn) per cap. In other words, with respect to the production of thermoplastic fibers made of ultrafine fibers, an annular cooling device that blows cooling air from the outer peripheral side of the yarn group discharged from the spinneret toward the center side of the discharged yarn group is provided to remove Wooster spots. It is indispensable to examine the arrangement of the spinneret without causing deterioration, with small variations in Wooster spots, and capable of multi-threading with a single base and low thread breakage in terms of productivity.

  In the examination so far, in Patent Document 2, an ultrafine multifilament yarn having a single yarn fineness of 1 denier or less of 200 filaments or more is melt-spun with good spinning, without causing close contact between single yarns or single yarn breakage. The purpose of the present invention is to provide a porous spinneret that can be uniformly cooled by an annular cooling device and obtain a yarn with excellent uniformity, and to provide a method for melt spinning ultrafine multifilament yarn using this spinneret. Proposals have been made that define the arrangement of the discharge holes of the die.

  Further, in Patent Document 3, in order to stably spin ultrafine fibers, the number of spinning holes in each block has a divided width having a distance of 1.5 times or more the nearest spinning hole interval perforated in the circumferential direction. There has been proposed a melt spinning method in which the spinning hole is cooled by a cylindrical cooling device using a spinneret in which the spinning holes are divided and arranged in six or more fan-shaped blocks so that the two are substantially equal.

  In these methods, for each single yarn group discharged from the discharge holes arranged in a plurality of rows, in order to minimize the cooling spots between the single yarn groups, the divided width (part where the spinning hole is not perforated) ) To secure the passage of the cooling air and blow cooling air to the single yarn group arranged on the outermost peripheral side of the plurality of rows while blowing the cooling air passing through the divided width to the single yarn group on the innermost peripheral side. It is a method of attaching and cooling. However, the outermost single yarn group is certainly preferable from the viewpoint of suppressing Wooster spots, but the innermost single yarn group is still insufficient in terms of uniform cooling because of the disturbance due to the diffusion of cooling air. It was. Further, the spinning holes arranged on the circumference sandwiched between the innermost and outermost rows are arranged in a plurality of radial shapes having the same central angle on a plurality of concentric circles as shown in FIG. When compared to the outermost and innermost single yarn groups, the single yarn groups arranged on the circumference sandwiched between the rows are not uniformly cooled and the Wooster spots become extremely worse and vary. There is a concern that will occur.

  In addition, in Patent Document 4, in the spinneret for multi spindle removal, the spinning holes are divided and arranged on the same circumference corresponding to the number of spindles, and the distance between the divisions on the same circumference is set to the outermost circumference. A spinneret that regulates the diameter and cools it with an annular cooling device has been proposed. In Patent Document 5, in a melt spinning base in which a large number of spinning holes are radially pierced radially so as to have the same central angle on a plurality of concentric circles, the number of spinning holes in each radial portion is equal, and the spinning holes are Defines the hole spacing in the circumferential direction in the innermost circumferential row that is perforated and the radial hole spacing in the radial portion, and in addition, the diameter and outermost circumference of the innermost circumferential row in which the spinning holes are drilled Proposals have been made in which ultrafine fibers having excellent uniformity can be stably obtained by defining the ratio of the circumferential rows.

However, regarding these, when focusing on the single yarn group discharged from the introduction hole on the outermost peripheral row side and the single yarn group discharged from the introduction hole on the innermost peripheral row side, as shown in FIG. After the cooling rectified air from the outermost row is blown onto the single yarn on the outermost row, it spreads or stagnates, and evenly and sufficiently stably does not reach the single yarn on the innermost row, or the lower surface of the base is used as a reference In this case, there is a problem in that the rectified air is not blown at the same point (height) in the discharged yarn group, the Wooster spots are deteriorated, and the close contact occurs between the single yarns in the vicinity of the inner circumferential row and the yarn breaks. Therefore, no matter how much the hole interval in the innermost circumferential row is regulated, as long as the discharge holes are on the same line in the radial direction, there is a limit to stably suppressing Wooster spots in each discharge yarn group. .
JP 2004-300614 A JP 7-278940 A JP 55-90609 A JP-A-53-58016 JP-A-55-112305

  In view of the above-described points, the object of the present invention is to produce a thermoplastic fiber by a melt spinning method, so that each single yarn is uniformly cooled, so that Worcester spots of each yarn group are small, and a single die is used. An object of the present invention is to provide a method for efficiently melt spinning thermoplastic fibers using a melt spinneret capable of striping multiple yarns, and an apparatus for producing the same.

The method for producing a thermoplastic fiber of the present invention that achieves the above-described object has the following configuration (1).
(1) A group of 2 to 8 yarns having a total number of yarns melted from a thermoplastic resin and annularly discharged from a spinneret is discharged into the discharged yarn using an annular cooling device provided directly below the spinneret. A manufacturing method in which a ring is cooled by cooling air blown from the outer peripheral side of the group toward the center side of the discharged yarn group, and the spinneret uses a spinneret that satisfies the following conditions (A) to (D) A method for producing a thermoplastic fiber characterized by the following.
(A) It has a plurality of discharge introduction holes, and the discharge introduction holes are arranged in one row in a ring or in a plurality of rows on a concentric circle.
(B) The said array is divided | segmented by the division band for dividing | segmenting for every yarn.
(C) The interval between the discharge introduction holes arranged on the outermost peripheral side is 0.2 mm ≦ L ≦ 15 mm.

However,
L: Discharge introduction hole interval (mm) arranged on the outermost periphery side
(D) When the spinneret is a spinneret having a plurality of discharge introduction holes arranged concentrically in a plurality of rows, the position of each discharge introduction hole is the center of the discharge introduction hole and the center of the spinneret. Arranged so that the center of the other discharge introduction hole does not exist on the connecting line.
(E) A spinneret having a plurality of discharge introduction holes in which spinnerets are arranged concentrically in a plurality of rows, the pitch circle diameter Dout of the discharge introduction hole group arranged on the outermost peripheral side, and a concentric circle with the pitch circle The following formula should be satisfied in relation to the pitch circle diameter Din of the innermost peripheral discharge introduction hole group arranged above.
0.7 ≦ Din / Dout <1
However,
Dout: Pitch circle diameter (mm) of the discharge introduction hole groups arranged on the outermost periphery
Din: Pitch circle diameter (mm) of innermost discharge outlet holes arranged concentrically with Dout

In the method for producing a thermoplastic fiber of the present invention, more specifically, preferably, the constitution is any of the following (2) to ( 7 ) .
(2) The steam is ejected toward the spinneret surface from which the yarn is discharged by using a steam ejection device provided directly below the spinneret and above the annular cooling device. ( 1 ) The manufacturing method of the thermoplastic fiber as described in.
( 3 ) The method for producing a thermoplastic fiber as described in ( 2 ) above, wherein the steam is ejected from an annular ejection port when the steam is ejected toward the spinneret surface.
( 4 ) After cooling the yarn group discharged from the spinneret into a ring, and supplying oil and entanglement, when taking it with the first take-up roller, take it as a yarn with a single yarn fineness of 1.2 dtex or less. The method for producing a thermoplastic fiber according to any one of the above (1) to ( 3 ).
( 5 ) The yarn group discharged from the spinneret is annularly cooled, supplied with oil and entangled, and then taken up with a take-up speed of 2500 m / min or more when taken up with the first take-up roller. The manufacturing method of the thermoplastic fiber in any one of said (1)-( 4 ).
( 6 ) The method for producing a thermoplastic fiber according to any one of (1) to ( 5 ) above, wherein the thermoplastic fiber is a polyamide fiber.
( 7 ) The method for producing a thermoplastic fiber according to any one of the above (1) to ( 6 ), wherein the thermoplastic fiber is a modified cross-section fiber.

Moreover, the thermoplastic fiber manufacturing apparatus of the present invention that achieves the above-described object has the following configuration ( 8 ).
( 8 ) Spinneret satisfying the following conditions (A) to ( E ), and cooling air is blown out from the outer periphery side of the annular discharge yarn group toward the center side of the discharge yarn group. An apparatus for producing thermoplastic fibers, comprising: an annular cooling device, wherein the annular cooling device is provided directly below the spinneret.
(A) It has a plurality of discharge introduction holes, and the discharge introduction holes are arranged in one row in a ring or in a plurality of rows on a concentric circle.
(B) The said array is divided | segmented by the division band for dividing | segmenting for every yarn.
(C) The interval between the discharge introduction holes arranged on the outermost peripheral side is 0.2 mm ≦ L ≦ 15 mm.

However,
L: Discharge introduction hole interval (mm) arranged on the outermost periphery side
(D) When the spinneret is a spinneret having a plurality of discharge introduction holes arranged concentrically in a plurality of rows, the position of each discharge introduction hole is the center of the discharge introduction hole and the center of the spinneret. Arranged so that no other discharge introduction hole exists on the connecting line.
(E) A spinneret having a plurality of discharge introduction holes in which spinnerets are arranged concentrically in a plurality of rows, the pitch circle diameter Dout of the discharge introduction hole group arranged on the outermost peripheral side, and a concentric circle with the pitch circle The following formula should be satisfied in relation to the pitch circle diameter Din of the innermost peripheral discharge introduction hole group arranged above.
0.7 ≦ Din / Dout <1
However,
Dout: Pitch circle diameter (mm) of the discharge introduction hole groups arranged on the outermost periphery
Din: Pitch circle diameter (mm) of innermost discharge outlet holes arranged concentrically with Dout

More specifically, the apparatus for producing a thermoplastic fiber of the present invention is more preferably composed of any one of the following ( 9 ) to ( 10 ).
(9) The thermoplastic fiber according to (8) , characterized in that a steam ejection device having an ejection port for ejecting steam toward the spinneret surface is provided directly below the spinneret and above the annular cooling device. Manufacturing equipment.
( 10 ) The apparatus for producing a thermoplastic fiber according to (9) , wherein the steam jetting device has an annular jetting port that jets steam toward the base surface immediately below the spinneret.

  According to the present invention, there is provided a thermoplastic fiber manufacturing method and a manufacturing apparatus therefor which are small in Worcester unevenness of yarn and capable of dealing with multiple yarns, are low in yarn breakage, and are efficient in terms of quality and operation and production. can do.

  Hereinafter, the thermoplastic fiber production method and production apparatus of the present invention will be described in more detail.

In the production method of the present invention, the spinneret satisfying the following conditions (A) to (D) and the cooling air are directed from the outer peripheral side of the annular discharge yarn group toward the center side of the discharge yarn group. An annular cooling device that blows out cooling air, and the annular cooling device is provided immediately below the spinneret, and uses a thermoplastic fiber manufacturing device, and has a total number of yarns of 2 to 8 A strip group is melt-spun and manufactured.
(A) It has a plurality of discharge introduction holes, and the discharge introduction holes are arranged in one row in a ring or in a plurality of rows on a concentric circle.
(B) The said array is divided | segmented by the division band for dividing | segmenting for every yarn.
(C) The interval between the discharge introduction holes arranged on the outermost peripheral side is 0.2 mm ≦ L ≦ 15 mm.

However,
L: Discharge introduction hole interval (mm) arranged on the outermost periphery side
(D) When the spinneret is a spinneret having a plurality of discharge introduction holes arranged concentrically in a plurality of rows, the position of each discharge introduction hole is the center of the discharge introduction hole and the center of the spinneret. Arranged so that no other discharge introduction hole exists on the connecting line.

  The spinneret used in the present invention has the characteristics (A) to (D) described above, which will be described below. FIG. 1A is a schematic model sectional view showing one embodiment (four yarns / spinner) of a spinneret of the thermoplastic fiber production apparatus of the present invention, and FIG. ) Is a schematic model side view showing a cross-sectional view of the side surface, and the discharge introduction hole 2 is a hole on the side for supplying the molten resin, and the molten resin is pushed out from the discharge hole 21 through the discharge introduction hole 2. The diameter of the discharge introduction hole 2 is preferably 0.5 mm or more. This is because by setting the thickness to 0.5 mm or more, the dirt adhering to the discharge introduction hole can be easily removed when performing the regeneration cleaning after using the spinneret.

  Further, regarding the arrangement when having a plurality of discharge introduction holes, in the case of one row, it is arranged annularly, that is, on the circumference as shown in FIG. 6, and in the case of a plurality of rows, for example, FIG. As shown in FIGS. 4 and 5, the discharge introduction holes are arranged on the respective concentric circumferences. Preferably, it is a plurality of rows. This is because the arrangement of the discharge introduction holes in a plurality of rows increases the number of holes, that is, the number of filaments per yarn increases, rather than arranging the discharge introduction holes in a single row.

  In the spinneret used in the present invention, the array is further divided by a dividing band for dividing each yarn.

  Here, the divided band is a region having a width W transversely toward the center point of the spinneret as shown by, for example, a two-dot chain line in FIG. Further, the number of the spinning areas X divided by the split band Y is the same as the number of the yarns in the spinneret, and when spinning from one spinneret, the yarns spun from each spinning area X are respectively Operated to form a single thread. For example, if there are three division bands, the discharge inlet hole area of the spinneret is divided into three, and the number of spinning spindles (spinning area number) is three, that is, three yarns (/ spinneret). In addition, the multiple yarn in the text means two yarns (/ spinner) or more. The dividing band width W (mm) is preferably 5 mm ≦ W ≦ 15 mm. This is because the split band not only divides the spinning area so as to cope with multiple yarns, but also distinguishes each yarn group discharged from the spinning area, for example, when threading on the oiling guide 8, This is because it is also suitable for dividing the group smoothly without any obstacles. As shown in FIGS. 9, 10 (a), and 10 (b), the divided band width is the center of the two discharge introduction holes that are closest to each other across the divided band in two adjacent spinning areas X. It is the width of the parallel line when assuming two parallel lines that pass through and the center line passes through the center of the spinneret.

  In addition, in the divided band width W, in relation to the discharge introduction hole interval L, it is preferable that W−L> 0 is satisfied, W−L ≧ 2 is more preferable, and L−W ≧ 3 is particularly preferable. . This is because, as described above, the division band width not only divides the spinning area into multiple yarns, but also allows the yarn threading operator to identify the spinning area at a glance when threading the multiple yarns, and smoothly divides them. It is also important to do.

  Further, in the present invention, the discharge introduction hole interval L (mm) arranged on the outermost peripheral side is the same as the discharge introduction hole and the discharge introduction hole adjacent to the discharge introduction hole as shown in FIG. The separation distance (L in FIG. 1B) on the circumference is shown. The discharge introduction holes arranged on the outermost peripheral side are basically arranged in the same spinning area at equal intervals. However, if there is a variation in the discharge introduction hole interval L due to the manufacturing accuracy of the spinneret or the like, the average value is taken. Further, there is no particular restriction on the interval or arrangement of the discharge introduction holes on the inner circumference side, but as shown in FIG. 13, for example, a plurality of discharge introduction holes on the inner circumference side may be arranged between the discharge introduction holes on the outer circumference side. . This separation distance is measured within the same spinning area, and the distance between the discharge introduction holes adjacent to each other with the dividing band interposed is excluded. In the present invention, the separation distance needs to satisfy 0.2 mm ≦ L ≦ 15 mm. Preferably, 1 mm ≦ L ≦ 5 mm. If L is less than 0.2 mm, the angle θ (rad) between the discharge introduction holes becomes too small when the discharge introduction holes 2 are drilled in the production stage of the spinneret 3, and the discharge introduction holes are formed in an annular shape. It is difficult to achieve dimensional accuracy at the time of arrangement, and it is difficult to restrict the arrangement of the discharge introduction holes, or the discharge introduction holes are connected to each other, which tends to be a defective base. In addition, since L is small, that is, the thickness between the holes is small, when a certain discharge introduction hole is blocked due to clogging with foreign matter, the balance of the discharge pressure is lost, and the thickness between the holes is distorted, and the spinneret itself becomes There arises a problem that it cannot be used.

  On the other hand, when L is greater than 15, for example, when the fineness per yarn is small, the gap between the holes is wide, so that the molten polymer that does not flow into the discharge introduction holes stays, and the staying portion is thermally deteriorated, and the heat When the deteriorated polymer is discharged from the discharge hole 21 shown in FIG. 1C through the discharge introduction hole, there arises a problem that yarn breakage frequently occurs.

In the present invention, in the case of a spinneret having a plurality of discharge introduction holes 2 arranged concentrically on a plurality of rows, the arrangement position of the discharge introduction holes 2 forming the inner ring row is one outer side of the ring row. In relation to the arrangement position of the discharge introduction holes forming the annular row, the arrangement position of each discharge introduction hole is such that no other discharge introduction hole exists on the line connecting the center of the discharge introduction hole and the center of the spinneret. It is necessary to be arranged in.
For example, when three or more rows of discharge introduction holes 2 are arranged as shown in FIG. 12A, the arrangement positions of the discharge introduction holes 2 are the center of one discharge introduction hole and the center of the spinneret. The center of the other discharge introduction hole does not exist on the line connecting the two. This is because if the center of the discharge introduction hole is arranged on the line, the cooling air from the annular cooling device cannot be uniformly blown to each single yarn spun from these discharge introduction holes. That is, as shown in FIG. 12B, the arrangement of the discharge introduction holes may be such that the center of each discharge introduction hole and the center of the spinneret do not exist on the line as shown in FIG. Further, as shown in FIGS. 12C and 12D, the outer periphery of another discharge introduction hole may be in contact with the above line, or the other discharge introduction hole may overlap with the above line. As shown in FIG. 12B, it is most preferable that no other discharge introduction hole exists on the line.

In the present invention, as shown in FIG. 1A, in the spinneret having a plurality of discharge introduction holes arranged concentrically in a plurality of rows, the pitch of the discharge introduction hole groups arranged on the outermost peripheral side. In the relationship between the circle diameter Dout and the pitch circle diameter Din of the innermost discharge introduction hole group arranged concentrically with the pitch circle, 0.7 ≦ Din / Dout <1 . Good Mashiku is 0.85 ≦ Din / Dout <1. When the pressure is smaller than 0.7, the spinneret and the cooling air blown toward the center of the annular cooling device diffuse and gradually weaken. When each single yarn discharged from the peripheral discharge introduction hole group is compared, variation in the Wooster spot occurs. On the other hand, Din / Dout does not satisfy 1 from the idea of the present invention. This is because the discharge introduction holes correspond to the annular arrangement in one row. Here, the pitch circle diameter is an annular diameter, that is, a circle diameter connecting the center points of the discharge introduction holes arranged on the circumference.

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, in the present invention, a steam jetting device can be provided directly below the spinneret and above the annular cooling device, and steam can be jetted toward the spinneret surface from which the yarn is discharged. 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 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.

  The yarn group discharged from the spinneret is normally cooled and then subjected to normal refueling and entanglement processing. Oiling is preferably performed by an oiling guide. The oiling discharge hole of the oiling guide is preferably set to be orthogonal or substantially orthogonal to the running yarn, and it is preferable to supply oil in the same direction.

  Hereinafter, preferred examples of the production apparatus used in the present invention will be described.

  The thermoplastic fiber production apparatus 1 preferably used in the present invention has a large number of discharges arranged in a row or a plurality of rows on a concentric circle as shown in the schematic model cross-sectional views of FIGS. A spinneret 3 having an introduction hole 2, a steam jetting device 5 having a steam jetting port 4 for jetting steam S toward the spinneret surface directly below the spinneret 3, and a lower part of the steam jetting device 5. The annular cooling device 7 that blows out the cooling air A as cooling air from the outer peripheral side of the discharge yarn group 6 in the ring shape toward the center side of the discharge yarn group, and the running yarn is moved by the annular cooling device 7. After cooling, an oiling guide 8 is provided that is perpendicular to the traveling yarn and is directed in the same direction. Thereafter, the yarn is entangled by the entanglement processing device 9 and wound by the winder 12 via the first take-up roller 10 and the second godet roller 11 as the second take-up roller.

  FIG. 2 shows a schematic model cross-sectional view of the bottom face portion of the spinneret of the thermoplastic fiber production apparatus 1 of the present invention, showing an example of an embodiment having a steam jetting device 5 and an annular cooling device 7.

  The steam jetting device 5 has a steam jetting port 4 provided directly below the spinneret 3 with a path provided in an annular slit shape for jetting the steam S from the outside toward the center point of the base surface. It is preferable. Further, as a means for ejecting the steam S toward the spinneret, a guide route means such as an annular hood 45 may be provided immediately above the annular cooling device 7.

  FIG. 3 shows a schematic model diagram from the spinneret 3 to the winder 12 including the thermoplastic fiber production apparatus 1 of the present invention. As shown in FIG. 3, the oiling guide 8 is preferably such that the oil supply / discharge hole 81 is orthogonal or substantially orthogonal to the traveling yarn and is directed in the same direction.

  In addition, in the manufacturing method of the present invention, when the yarn group discharged from the spinneret 3 is taken up by the first take-up roller 10 after the discharge, the single yarn fineness is reduced to 1.2 decitex or less. Thus, when stretching and taking-up are performed, the effect of the present invention is more remarkably exhibited. More preferably, it is a case of a thermoplastic fiber having a single yarn fineness of 1.0 dtex or less, more preferably 0.3 to 0.8 dtex.

  With such a configuration, a thermoplastic fiber having practical mechanical properties can be manufactured by the most rational process. 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 and 7000 m / min or less. It is preferable in view of cost and stable production that it is possible to cope with higher speed in addition to making multiple yarns.

  Moreover, in the manufacturing method of the thermoplastic fiber of this invention, it can apply preferably to a polyamide fiber, a polyester fiber, etc. In particular, since the effect of the present invention is remarkable, it is effective for polyamide fibers. 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 these thermoplastic fiber production methods and production apparatuses of the present invention, the Worcester spot of the yarn is stable and small, and the multi-thread can be removed with a single spinneret so that the yarn breakage is low and efficient. Thermoplastic fiber yarns can be produced.

  This is the case when the production method and the production apparatus of the present invention produce a yarn composed of ordinary round cross-section fibers, as well as a fiber yarn composed of thin and fine cross-section fibers. In addition, a similar effect can be obtained. 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 thermoplastic fiber of this invention and its manufacturing apparatus are demonstrated more concretely. In addition, each characteristic value in an Example and a comparative example was judged with the following method paying attention to Wooster spots and the frequency | count of thread breakage. Moreover, about the fineness measurement, it measured according to JISL1013-1999 8.3.1 fineness fine quantity fineness A method.
[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 variation state (UH% value) of the plaque was obtained and evaluated in 4 stages, and Δ or more was regarded as acceptable.
A: “Excellent” (UH% = ˜less than 0.5)
○: “Excellent” (UH% = less than 0.5 to 0.7)
Δ: “Good” (UH% = less than 0.7 to 1.0)
X: “Inferior” (UH% = 1.0-)
[Thread break]
At the time of melt spinning, a prototype amount of 2 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 ~ 1.5 (times / ton))
○: “Excellent” (less than 1.5 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 the comprehensive evaluation, based on the above [Wooster's spot] and "thread breakage" evaluation, the one with the lower evaluation in the above results was adopted as the result of the comprehensive evaluation.
○: “Adoptable and excellent”
△: “Adoptable”
×: “Inferior, not available”
(Examples 1-9, Comparative Examples 1-2)
2 and 3, for example, an array of two or one annular discharge introduction holes shown in FIG. 4, FIG. 5 and FIG. 6, or an annular three row (annular two rows, shown in FIG. 7). In the case of three rows, the positions of the discharge introduction holes are arranged such that the center of the other discharge introduction hole does not exist on the line connecting the center of the discharge introduction hole and the center of the spinneret. The spinneret with the discharge holes having the shapes of round holes, Y holes, and T holes in the form shown in Table 1 is manufactured for each type, and the discharge introduction hole length, the discharge introduction hole interval L, and the divided width In order to evaluate W, a spinning test was performed. Note that the values of Din / Dout when the discharge introduction hole arrangement is two rows are Din / Dout = 0.89 (Din = 80 mm, Dout = 90 mm).

Further, the spinning test includes 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.), and polyester. (IV = 0.63 (Intrinsic Viscosity in Orthochlorophenol Solution), Melting Temperature 290 ° C.) Each of the polymers was melted in a production apparatus, discharged from the spinneret 3, and then an annular injection port using a vapor injection device The steam S is sprayed onto the base surface by the above, the yarn is cooled by the annular cooling device, the oil supply discharge hole 81 of the oiling guide 8 is made to be orthogonal or substantially orthogonal to the traveling yarn, and the entanglement processing device 9 The entanglement process was performed, and melt spinning was performed at a take-up speed of 2500 m / min with the first take-up roller 10 to obtain polyamide fiber yarns for each type. The obtained fiber yarns were evaluated for Worcester spots and the number of yarn breakage, and were evaluated comprehensively. The results are shown in Table 1. 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.

(Comparative Example 3)
Example 2 with the exception of an array of two annular rows of discharge introduction holes (disposed on the same straight line drawn from the outer peripheral side of the discharge introduction hole group toward the center of the discharge introduction hole group). In the same manner, melt spinning was performed to obtain a nylon 6 fiber yarn of 10 dtex 19 filaments. The results are shown in Table 1.

(Comparative Example 4)
The presence or absence of an annular cooling device was melt-spun in the same manner as in Example 2, and a nylon 6 fiber yarn of 10 dtex 19 filaments was spun and evaluated. The results are shown in Table 1.

As can be seen from Table 1, when the discharge introduction hole interval is 0.2 to 15 mm, both Wooster spots and thread breakage are good. On the other hand, when the discharge introduction hole interval was 0.1 mm and 19 mm, the number of yarn breaks was particularly large, and the yarn forming property was poor. Further, in the spinneret having a plurality of discharge introduction holes arranged concentrically in two rows, in relation to the arrangement position of the discharge introduction holes forming the annular row on the outer side of the annular row, It can be seen that both Wooster spots and thread breakage are good when they do not exist on the same straight line drawn from the outer peripheral side toward the center of the discharge introduction hole group.
Furthermore, it can be seen that varieties with small single yarn fineness are effective with respect to Wooster spots and thread breakage by using an annular cooling device.

(Examples 10 to 14)
2 and FIG. 3, for example, in the arrangement of the discharge introduction holes in two annular rows as shown in FIG. 8, the divided width W = 12.2 (mm) and the discharge introduction holes are φ1. The relationship between Dout and Din was evaluated using a spinneret of 4 yarns / base, with 5 (mm) and discharge introduction hole interval L = 5 (mm). Further, the spinning speed at the first take-up roller 10 was set to 3000, 5000 (m / min), and melt spinning was performed in the same manner as in Example 2 to obtain a nylon 6 fiber yarn of 10 dtex 19 filaments. The obtained fiber yarns were evaluated for Worcester spots and the number of yarn breakage, and were evaluated comprehensively. The results are shown in Table 2.

  As can be seen from Table 2, when Din / Dout is 0.7 or more, one stage is good for Wooster spots.

(Examples 15 and 16)
2 and FIG. 3, for example, in the arrangement of the discharge introduction holes in the annular three rows as shown in FIG. 11, the divided width W = 12.2 (mm) and the discharge introduction holes are φ1. 5 (mm), discharge introduction hole interval L = 5 (mm), Din = 70 (mm), Dout = 90 (mm) (Din / Dout = 0.78), and a four-thread / spinneret was used. Except for the case where steam was blown onto the spinneret surface, melt spinning was carried out in the same manner as in Example 2 to obtain a nylon 6 fiber yarn of 13 dtex 27 filaments. The obtained fiber yarns were evaluated for Worcester spots and the number of yarn breakage, and were evaluated comprehensively. The results are shown in Table 3.

As can be seen from Table 3, when steam is blown, the thread breakage is improved by one step.

FIG. 1A is a schematic model diagram showing an embodiment (four yarns / spinneret) of a spinneret of a thermoplastic fiber manufacturing apparatus of the present invention. FIG.1 (b) shows the enlarged view of the A section of Fig.1 (a). FIG.1 (c) is a schematic model side view which shows sectional drawing of the side surface of Fig.1 (a). FIG. 2 is a schematic model cross-sectional view showing the lower surface portion of the spinneret of the thermoplastic fiber manufacturing apparatus of the present invention. The yarn melt-spun in one embodiment of the thermoplastic fiber manufacturing apparatus according to the present invention passes through the oiling guide 8, the entanglement processing device 9, the first take-up roller 10, and the second godet roller 11, and the winder 12. FIG. 5 is a schematic model diagram showing a process until reaching and winding. It is a schematic model diagram of an example of an embodiment showing Example 1 of the present invention. It is a schematic model figure of the example of one embodiment which shows Example 2 of this invention. It is a schematic model figure of the example of one embodiment which shows Example 3 of this invention. It is a schematic model figure of the example of one embodiment which shows Example 4 of this invention. It is a schematic model diagram of one embodiment showing Examples 10 to 14 of the present invention. It is a schematic model diagram of an embodiment example of a spinneret corresponding to three yarns in the present invention. 10 (a) and 10 (b) are schematic model diagrams showing an embodiment of the divided band width W in the spinneret of the present invention. It is a schematic model diagram of one embodiment showing Examples 15 and 16 of the present invention. FIG. 12A is a schematic model diagram showing an embodiment (four yarns / spinneret) of the spinneret of the present invention, and shows a spinning area for one yarn. 12 (b), 12 (c), and 12 (d) are schematic models showing the spinning area for one yarn similarly to the above and showing one embodiment showing the arrangement of the discharge introduction holes. FIG. It is a schematic model figure of the example of an embodiment which shows arrangement | positioning of the discharge introduction hole of the inner peripheral side of the spinneret in this invention. FIG. 4 is a schematic model diagram showing the flow of cooling air in addition to the discharge hole arrangement of the spinneret in the known examples so far.

Explanation of symbols

1: Manufacturing device 2: Discharge introduction hole 21: Discharge hole 3: Spinneret 4: Steam injection port 45: Annular hood 5: Steam ejection device 6: Discharge yarn group 7: Annular cooling device 8: Oiling guide 81: Refueling discharge Hole 9: Entanglement processing device 10: First take-up roller 11: Second godet roller 12: Winder S: Steam A: Cooling air X: Spinning area Y: Dividing zone θ: Angle between discharge introduction holes

Claims (10)

An outer periphery of the discharged yarn group is obtained by melting the thermoplastic resin and discharging the yarn group having 2 to 8 total yarns annularly discharged from the spinneret using an annular cooling device provided immediately below the spinneret. A manufacturing method in which a ring is cooled by cooling air blown from the side toward the center side of the discharged yarn group, wherein the spinneret uses a spinneret that satisfies the following conditions (A) to (E) : A method for producing a thermoplastic fiber.
(A) It has a plurality of discharge introduction holes, and the discharge introduction holes are arranged in one row in a ring or in a plurality of rows on a concentric circle.
(B) The said array is divided | segmented by the division band for dividing | segmenting for every yarn.
(C) The interval between the discharge introduction holes arranged on the outermost peripheral side is 0.2 mm ≦ L ≦ 15 mm.
However,
L: Discharge introduction hole interval (mm) arranged on the outermost periphery side
(D) When the spinneret is a spinneret having a plurality of discharge introduction holes arranged concentrically in a plurality of rows, the position of each discharge introduction hole is the center of the discharge introduction hole and the center of the spinneret. Arranged so that the center of the other discharge introduction hole does not exist on the connecting line.
(E) A spinneret having a plurality of discharge introduction holes in which spinnerets are arranged concentrically in a plurality of rows, the pitch circle diameter Dout of the discharge introduction hole group arranged on the outermost peripheral side, and a concentric circle with the pitch circle The following formula should be satisfied in relation to the pitch circle diameter Din of the innermost peripheral discharge introduction hole group arranged above.
0.7 ≦ Din / Dout <1
However,
Dout: Pitch circle diameter (mm) of the discharge introduction hole groups arranged on the outermost periphery
Din: Pitch circle diameter (mm) of innermost discharge outlet holes arranged concentrically with Dout Using steam injection device disposed above the right under a and annular cooling system of the spinneret, toward the spinneret face which ejects yarn, to claim 1, characterized in that ejecting steam The manufacturing method of the thermoplastic fiber of description. The method for producing a thermoplastic fiber according to claim 2 , wherein the steam is ejected from an annular ejection port when the steam is ejected toward the spinneret surface. The method for producing a thermoplastic fiber according to any one of claims 1 to 3 , wherein the single fiber fineness of the thermoplastic fiber is 1.2 dtex 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. method for producing a thermoplastic fiber according to any one of 1-4. The method for producing a thermoplastic fiber according to any one of claims 1 to 5 , wherein the thermoplastic fiber is a polyamide fiber. The method for producing a thermoplastic fiber according to any one of claims 1 to 6 , wherein the thermoplastic fiber is a modified cross-section fiber. A spinneret that satisfies the following conditions (A) to ( E ), and an annular cooling device that blows cooling air from the outer peripheral side of the annular discharge yarn group toward the center side of the discharge yarn group And the annular cooling device is provided directly below the spinneret.
(A) It has a plurality of discharge introduction holes, and the discharge introduction holes are arranged in one row in a ring or in a plurality of rows on a concentric circle.
(B) The said array is divided | segmented by the division band for dividing | segmenting for every yarn.
(C) The interval between the discharge introduction holes arranged on the outermost peripheral side is 0.2 mm ≦ L ≦ 15 mm.
However,
L: Discharge introduction hole interval (mm) arranged on the outermost periphery side
(D) When the spinneret is a spinneret having a plurality of discharge introduction holes arranged concentrically in a plurality of rows, the position of each discharge introduction hole is the center of the discharge introduction hole and the center of the spinneret. Arranged so that the center of the other discharge introduction hole does not exist on the connecting line.
(E) A spinneret having a plurality of discharge introduction holes in which spinnerets are arranged concentrically in a plurality of rows, the pitch circle diameter Dout of the discharge introduction hole group arranged on the outermost peripheral side, and a concentric circle with the pitch circle The following formula should be satisfied in relation to the pitch circle diameter Din of the innermost peripheral discharge introduction hole group arranged above.
0.7 ≦ Din / Dout <1
However,
Dout: Pitch circle diameter (mm) of the discharge introduction hole groups arranged on the outermost periphery
Din: Pitch circle diameter (mm) of innermost discharge outlet holes arranged concentrically with Dout 9. The apparatus for producing a thermoplastic fiber according to claim 8 , wherein a steam jetting device having a jetting port for jetting steam toward the spinneret surface is provided directly below the spinneret and above the annular cooling device. . The apparatus for producing thermoplastic fibers according to claim 9 , wherein the steam jetting device has an annular jetting port for jetting steam toward the die surface directly below the spinneret.

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