JP2009133025A - Spinneret of thermoplastic modified cross-section fiber and method for producing thermoplastic modified cross-section fiber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spinneret for a thermoplastic modified cross-section fiber, which can stably produce a modified cross-section fiber, supplies a high-quality raw yarn having excellent Uster unevenness and slight face variation and provides a product having high qualities and high grades when a fabric is produced and a method for producing a thermoplastic modified cross-section fiber. <P>SOLUTION: In the spinneret for discharging a thermoplastic modified cross-section fiber by using a ring-shaped cooler that is arranged right under the spinneret for discharging a molten polymer and blows cooling air from outside ring-shaped directions with a discharging line as a center, the spinneret of a thermoplastic modified cross-section fiber has a constitution that the discharge holes of the spinneret all have modified shapes with slits and at least one slit of all the discharge holes having the modified shapes is arranged in parallel with and opposingly to cooling air blown from the ring-shaped cooler. The method for producing a thermoplastic modified cross-section fiber includes using the spinneret. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a spinneret capable of obtaining suitable quality in a thermoplastic profile cross-section fiber. Further, a spinneret capable of producing a thermoplastic deformed cross-section fiber with little cross-sectional variation and small Worcester spots, and providing a good quality fabric when used as a fabric, and a thermoplastic deformed shape using the spinneret. The present invention relates to a method for producing a cross-sectional fiber.

  Thermoplastic resins such as polyamide and polyester are produced by melt spinning. These thermoplastic fibers are used in a wide range of fields because of their characteristics. In particular, in the field of clothing, diversification of technologies such as changing the cross section of thermoplastic fibers to give gloss and water absorption, and reducing the single yarn fineness to give softness due to consumer needs. Has been done.

  For spinning equipment of thermoplastic deformed cross-section fibers, the discharge holes of the spinneret are polymers such as Y holes, T holes, X holes, H holes, etc. In general, a system (uniflow method) for cooling in the longitudinal direction so as to be orthogonal or substantially orthogonal. However, in this method, the thread farther from the cooling air blowing port has poorer cooling air passage properties, causing thick and thin spots due to insufficient cooling of the filaments, and worsening of Worcester spots and cross-sectional shape variations are likely to occur. When these yarns are subjected to high-order processing to form a fabric, for example, when used for a woven warp, it causes vertical problems.

  Conventionally, in order to improve the passage of the cooling air, the arrangement of the discharge hole interval and the discharge holes has been improved, but in the recent garment field, for cost reduction and single yarn fineness, The number of spinnerets for taking multiple yarns of two or more yarns has increased, and the number of discharge holes per spinneret has increased. For this reason, application of the prior art still has deterioration of Worcester spots due to insufficient cooling and variation in cross-sectional shape, and does not achieve the required level, and further improvement has been demanded.

  On the other hand, as a uniform cooling technique, a system (annular cooling method) is known that uses an annular cooling device to cool a polymer discharged from a spinneret from an annular direction, and is an excellent uniform cooling method. With regard to this annular cooling device, the arrangement of the spinnerets and the distance between the holes have been studied from the past, but there are many related to the single-fiber fine-fining technique, with the discharge holes being round holes.

  For example, as shown in paragraph 0017 of Patent Document 1, when the spinneret discharge holes are irregularly shaped holes, 2 to 6 rows of introduction hole groups are formed on the circumference. Filaments sometimes overlap, and the filaments close to the cooling air blowing surface are cooled, but the filaments far from the cooling air blowing surface are poorly cooled and insufficiently cooled.

  Also, in the spinneret shown on page 4, lines 17-39 of Patent Document 2, since the discharge holes of the spinneret are arrayed in multiple concentric circles, a modified cross-section fiber having a large surface area is produced. In some cases, the filaments overlap and the filaments close to the cooling air blowing surface are cooled, but the filaments far from the cooling air blowing surface are poorly cooled and insufficiently cooled. Furthermore, the slow cooling effect of each filament cannot be obtained, causing a decrease in yarn strength and elongation, making it difficult to obtain a satisfactory high quality product.

On the other hand, in the spinneret shown in paragraphs 0013 to 0014 of Patent Document 3, a method of arranging a plurality of discharge holes in a substantially horizontal row has been proposed, but the number of discharge holes perforated in one group has been proposed. If the number of perforations in one group is 3 or more, there is no problem if the number is 2 or less, but the interval between the ejection holes becomes smaller (the ejection holes become closer), and the accompanying airflow generated during yarn production collides with the cooling air blown upward. As a result, yarn swaying occurs, causing filament fusion, which is not preferable because it causes operation and quality abnormalities.
JP 2007-9368 A JP 2006-241611 A Japanese Patent Application No. 1-322166

  The object of the present invention is to provide a good quality yarn that can stably produce irregularly shaped cross-section fibers, has good Worcester spots, and has little surface variation in view of the above points. It is another object of the present invention to provide a spinneret for thermoplastic deformed cross-section fibers and a method for producing thermoplastic deformed cross-section fibers that can provide excellent high-quality and high-quality products.

In order to achieve the above object, the spinneret of the thermoplastic modified cross-section fiber of the present invention has the following configuration (1).
(1) In a spinneret that discharges thermoplastic deformed cross-section fibers using an annular cooling device that is provided directly below a spinneret that discharges a molten polymer and blows cooling air from an outer annular direction around a discharge line. All the discharge holes of the spinneret have an irregular shape having slits, and at least one slit among all the discharge holes having the irregular shape is parallel to the cooling air blown out from the annular cooling device. A spinneret characterized by being provided oppositely.

Moreover, in the spinneret of the thermoplastic modified cross-section fiber of the present invention, a more preferable configuration as a specific configuration is any one of the following (2) to (8).
(2) The spinneret has a plurality of discharge introduction hole groups arranged concentrically, and one slit of all the irregular discharge holes in the discharge introduction hole group is the direction of the cooling air of the annular cooling device The spinneret according to (1) above, wherein the spinneret is provided in parallel to and opposite to the spinneret.
(3) The spinneret has a plurality of discharge introduction hole groups arranged concentrically and has at least one irregular discharge hole forming a filament closest to the cooling air outlet in the discharge introduction hole group. The spinneret as described in (1) above, wherein the slit is provided in parallel to and opposite to the direction of the cooling air of the annular cooling device.
(4) When the number of irregular discharge holes in the plurality of discharge introduction hole groups is an odd number, the irregular discharge holes are arranged in line symmetry with respect to the direction of the cooling air of the annular cooling device, and the spinneret center is One spinneret according to (2) or (3) above, wherein one is arranged on a straight line passing through.
(5) When the number of irregular discharge holes in the plurality of discharge introduction hole groups is an even number, the irregular discharge holes are not arranged on a straight line passing through the spinneret center with respect to the direction of the cooling air of the annular cooling device. The spinneret according to any one of (2) to (4), wherein the spinneret is provided in a state.
(6) The above-described (2) to (2), wherein the odd-shaped discharge holes in the discharge introduction hole group are arranged in a straight line when there are two, and are arranged in a regular polygon when there are three or more. The spinneret according to any one of 5).
(7) The spinneret according to any one of the above (2) to (6), wherein the discharge introduction hole groups are arranged in a row or concentric circles in a row.
(8) The above-mentioned (2) to (2), wherein the discharge introduction hole group has 2 to 5 discharge holes, is arranged in a row and has 2 to 5 slits of irregular discharge holes. The spinneret according to any one of 7).

Moreover, the manufacturing method of the thermoplastic modified cross-section fiber of the present invention that achieves the above-described object has the following configuration (9).
(9) A method for producing a thermoplastic modified cross-section fiber, comprising melt-spinning a thermoplastic deformed cross-section fiber using the spinneret according to any one of (1) to (8).

  According to the spinneret of the present invention, when a thermoplastic deformed cross-section fiber is produced by melt spinning, very stable production is possible, and a good quality yarn with Worcester spots can be produced. Further, when the raw yarn is further used as a fabric, a secondary fiber product having excellent quality and quality can be provided.

  Hereinafter, the spinneret for spinning the thermoplastic modified cross-section fiber of the present invention will be described in more detail with reference to the drawings.

  The spinneret for melt-spinning the thermoplastic modified cross-section fiber of the present invention relates to a die manufactured by deforming a thermoplastic resin polymer according to the shape of the discharge hole of the spinneret, and more specifically, a thin perforated through which the polymer passes through the spinneret. Limited to spinneret with gaps (slits).

  Specifically, all the discharge holes of the spinneret have an irregular shape having slits, and at least one of the discharge holes having the irregular shape has a cooling air blown out from the annular cooling device. On the other hand, it is provided in parallel and facing.

  In the present invention, the slit refers to a discharge hole shape having grooves that are substantially parallel to the same direction, and does not include ◯ and Δ shapes.

  When producing a thermoplastic profile cross-section fiber using the die of the present invention, the means for cooling the discharged molten polymer is a yarn using an annular cooling device that blows cooling air from the annular direction directly under the spinneret. The maximum effect can be obtained by cooling and solidifying the strip. As the annular cooling device, for example, a conventionally known annular cooling device such as an internal blowing cooling method for discharging cooling air from the outside to the inside and an external blowing cooling method for discharging cooling air from the inside to the outside can be used. . That is, unlike the uniflow method, which is a cooling method in which cooling air is supplied in the longitudinal direction so as to be orthogonal or substantially orthogonal to the traveling yarn, in the annular cooling method, cooling air is supplied to the traveling yarn from the annular air flow blowing portion. This is because it is preferable because each filament can be cooled uniformly. In particular, in the case of a multi-threaded base having a large number of discharge holes per spinneret or a single-thread fineness base, each filament is cooled uniformly by the rectified cooling air blown from the annular cooling device. This is effective in reducing Worcester spots and cross-sectional variations.

  In the spinneret of the thermoplastic modified cross-section fiber of the present invention, it is necessary that all the discharge holes have an irregular shape. The shape is not particularly limited, and is not particularly limited. For example, a slit is provided in the discharge hole of the spinneret such as a so-called three-leaf type, five-leaf type, hollow type, cross shape, flat type, and lens type. The discharge holes are preferred. Even if the discharge hole is round, the effect of reducing Worcester spots can be obtained, but the same effect can be obtained by the conventional techniques of Patent Document 1 and Patent Document 2 described above.

  As shown in FIG. 1, in the spinneret 1 of the thermoplastic modified cross-section fiber according to the present invention, at least one slit among all the discharge holes 2 having the deformed shape is cooled by the annular cooling device. On the other hand, it is important that they are provided in parallel and opposite to each other.

  That is, if the discharge hole slit having a deformed shape is not parallel to and opposed to the cooling air blown from the annular cooling device, the yarn cooling is possible, but the cooling to the deformed filament is locally performed. This leads to poor cross-section formation and cross-sectional variation and Worcester spots. For example, when the yarn is used as a warp of a woven fabric to form a fabric, vertical lines are generated and the quality is deteriorated.

  On the other hand, like the base of the present invention, at least one slit among all the discharge holes having an irregular shape is provided so as to be parallel and opposed to the cooling air blown from the annular device, The cooling air brings about a uniform cooling effect by increasing the surface area in contact with the deformed filament, and a fiber yarn free from cross-sectional variation and Worcester spots can be obtained. When these yarns are subjected to high-order processing to form a fabric, for example, when used for a woven warp, a high-quality and high-quality fabric can be obtained.

  More preferably, the spinneret of the thermoplastic modified cross-section fiber of the present invention has a plurality of discharge introduction hole groups arranged concentrically. The arrangement of the plurality of discharge introduction hole groups is preferably an arrangement that does not overlap with the cooling air blown from the annular cooling device. For example, as shown in FIG. 2, it is more preferable that the plurality of discharge introduction hole groups are arranged in the same circular center. Further, as shown in FIGS. 3A and 3B, one slit of all the irregular shaped discharge holes in the discharge introduction hole group is opposed in parallel to the cooling air direction 3 of the annular cooling device. It is most preferable, but one slit of all the irregular discharge holes in the discharge introduction hole group is blown out from the annular cooling device so as to be parallel to and opposite to the direction of the cooling air of the annular cooling device. It is necessary to finely adjust the direction of the slit of the irregular discharge hole 2 drilled in the spinneret 1 in accordance with the direction 3 of the cooling air, and the manufacturing cost of the spinneret is greatly increased due to the advanced processing accuracy and difficulty of the spinneret. Become. However, the cooling air blown out from the annular cooling device increases the surface area in contact with the deformed filament, thereby providing a uniform cooling effect and obtaining a fiber yarn free from cross-sectional variations and Worcester spots. In order to reduce the die manufacturing cost, for example, as shown in FIGS. 4A and 4B, at least one deformed discharge hole that forms a deformed filament closest to the cooling air outlet in the discharge introduction hole group is used. The two slits may be parallel to and opposed to the direction of the cooling air of the annular cooling device, and the odd-shaped discharge hole closest to the cooling air outlet in the discharge introduction hole group is used as a reference hole, and the same introduction hole. If the remaining irregular discharge holes drilled in the same direction and slits do not overlap, the processing accuracy and manufacturing difficulty of the spinneret will not be difficult, and the cooling air should maintain the surface area that touches the irregular filaments. As a result, it is possible to obtain a fiber yarn having a uniform cooling effect and free from cross-sectional variations and Worcester spots.

  In addition, when the slits perforated in the discharge introduction hole overlap (for example, FIGS. 5A and 5B), the slit close to the cooling air outlet discharged from the annular device can obtain a uniform cooling effect. However, the slit far from the cooling air outlet that is discharged from the annular device reduces the cooling effect due to the overlap of the threads, causing cross-sectional variation due to insufficient cooling, worsening of Worcester spots, and thread breakage. . In the spinneret of the thermoplastic modified cross-section fiber of the present invention, when the number of deformed discharge holes in the discharge introduction hole group is an odd number (for example, FIGS. 6A and 6B), the cooling air of the annular cooling device It is preferable that the odd-shaped discharge holes have a line-symmetrical arrangement with respect to the direction of. Moreover, it is preferable that one is arranged on a straight line passing through the spinneret center. Here, the straight line passing through the spinneret center means a straight line passing through the spinneret center point (R) and the cooling air outlet (P) shown in FIG. A line-symmetric arrangement indicates an arrangement that is symmetrical with respect to a straight line passing through the spinneret center line. By adopting such an arrangement, it is possible to maintain the passage of cooling air and to exert a high cooling effect.

  Further, when there are three or more odd-shaped discharge holes in the discharge introduction hole group, it is more preferable that they are arranged in a regular polygon. Here, the regular polygon means a figure that can be drawn by connecting the center points (r) of the irregularly shaped discharge holes as shown in FIGS. 5 (1), 7 (a), and 7 (b). . Thus, by making it a regular polygon, the uniform pitch between holes can be maintained, the passage of cooling air can be improved, and a high cooling effect can be exhibited. FIG. 6A is a regular triangle type in which the number of ejection holes perforated in each polymer introduction hole is three, and FIG. 6B is a positive shape in which the number of ejection holes perforated in each polymer introduction hole is five. An example of a pentagon type spinneret array is shown.

  In the spinneret of the thermoplastic deformed cross-section fiber of the present invention, when the number of deformed discharge holes in the discharge introduction hole group is an even number (for example, FIGS. 7A and 7B), the direction of the cooling air of the annular cooling device On the other hand, it is preferable that the irregular discharge holes are provided in a state where they are not arranged on the spinneret center dotted line. By adopting such an arrangement, it is possible to maintain the passage of cooling air and to exert a high cooling effect.

  Further, when there are two odd-shaped discharge holes in the discharge introduction hole group, it is more preferable that the arrangement is a straight line connecting the deformed discharge hole center points (r) shown in FIG. In this case, when the distance between the polymer introduction hole center point (B) and each irregular discharge hole center point (r) is a1 and a2, respectively, it is most preferable that the length relationship of a1 = a2 is satisfied.

  Further, when the number of irregular discharge holes in the discharge introduction hole group is 4 or more, it is more preferable to arrange them in a regular polygon. Thus, by making it a regular polygon, a uniform pitch between holes can be maintained, the passage of cooling air can be improved, and a high cooling effect can be exhibited. FIG. 7A is a linear type in which the number of ejection holes perforated in each polymer introduction hole is two, and FIG. 7B is a regular square shape in which the number of ejection holes perforated in each polymer introduction hole is four. 1 shows an example of a spinneret arrangement of a mold.

  In the spinneret of the thermoplastic modified cross-section fiber of the present invention, it is preferable that the discharge introduction hole groups are arranged in a row or in a plurality of rows concentrically. It is preferable that the discharge introduction hole group in which the cooling air blown out from the annular cooling device is the best in one row, but the discharge introduction hole is within a range in which there is no difference in cross-sectional variation and Worcester spots. The group may be arranged in a concentric circle in a plurality of rows.

  The spinneret of the thermoplastic modified cross-section fiber of the present invention preferably has 2 to 5 discharge holes in the discharge introduction hole group. In the case of one, the rise generated by the collision of the cooling air to be discharged when the internal blowing cooling method for discharging the cooling air from the outside to the inside or the external blowing cooling method for discharging the cooling air from the inside to the outside is used in combination. The airflow lowers the temperature of the spinneret discharge surface, and causes cooling spots. In the case of 6 or more, there is no problem as long as the quality is not affected, but as the number of discharge holes increases, the distance between the holes of the slits forming the irregular cross section becomes narrower, resulting in overlapping of the slits and insufficient cooling. This causes deterioration in cross-sectional shape and Worcester spots, and also causes yarn breakage due to fusion of single yarns. Therefore, by setting it as such a range, it becomes possible to relieve the temperature drop of the spinneret discharge hole due to the rising air flow and to obtain a slow cooling effect and to suppress fineness spots and cross-sectional variations due to cooling spots.

  The arrangement of the discharge holes in the discharge introduction hole group is preferably arranged in a row in a ring shape. If the ring does not form a line, the distance between adjacent discharge holes is not uniform, the thermoplastic resin is discharged from the discharge holes, the amount of heat retained when passing through the cooling device is different, and cooling spots are generated. Therefore, fineness spots and cross-sectional variations are generated.

  Furthermore, it is preferable to have 2 to 5 slits of irregular discharge holes in the discharge introduction hole group. More preferably, it has 2 to 3 slits of irregularly shaped discharge holes. When there are 6 or more slits in the irregularly shaped discharge hole, it is necessary to further improve the passage through the cooling air because the passage through the cooling air is deteriorated. Since it is necessary to reduce the number of discharge introduction hole groups and the number of discharge holes, it is not preferable in terms of productivity.

  In the spinneret of the thermoplastic modified cross-section fiber of the present invention, in order to obtain efficiently with multiple yarns, a separation band of 4 or less may be provided, and the separation band is preferably 10 mm or more in width. When the width of the separation band is less than 10 mm, the distance between the yarns is small, and it becomes difficult not only to separate the obtained yarn group, but also the problem that one yarn group is mixed into the adjacent yarn group. appear. Separation is facilitated when the width of the separation band is 10 mm or more, but the distance between adjacent discharge hole groups is narrowed, and the filaments are likely to be fused due to vibration of the filaments by cooling air. ~ 13 mm.

  In the thermoplastic modified cross-section fiber of the present invention, the thermoplastic resin polymer is not particularly limited as long as it can be melted. For example, polyamide such as nylon 6 and nylon 66, polyethylene terephthalate, polybutylene terephthalate, polytrimethylene Examples thereof include polyesters such as terephthalate and polylactic acid, and cellulose esters such as polypropylene, cellulose acetate, and cellulose acetate propionate. In addition, additives such as moisture absorption, antibacterial, matte, UV cut, antistatic, etc. for these thermoplastic resin polymers, and additives such as heat-resistant agents for improving yarn production are added. It may be added.

  In the method for producing a thermoplastic modified cross-section fiber of the present invention, generally, in order to melt-spin polyethylene such as polyethylene terephthalate, nylon 6, nylon 66, etc., unstretched by winding at a low spinning speed of 2000 m / min or less. A two-step method of drawing a yarn into a flat yarn, a method of drawing a POY wound at a spinning speed of 2000 m / min or more to make a false twisted yarn, and without winding the spun yarn There are methods such as continuous stretching heat treatment, and these known methods can be used.

  The single yarn fineness of the thermoplastic modified cross-section fiber obtained by the present invention is preferably 0.8 dtex or more, and more preferably 1.4 dtex or more. This is because, when the single yarn fineness is less than 0.8 dtex, the shape of the irregular cross-section fiber is rounded, and the inherent gloss and water absorption performance of the irregular cross-section fiber is reduced. Even when the single yarn fineness exceeds 4 dtex, it is possible to suppress the cross-sectional variation of the thermoplastic deformed cross-section fiber, etc., but this is the same effect even when implemented by a general cooling method (uniflow method). Therefore, a preferable range is 0.8 to 3.5 dtex, and further 1.4 to 2.5 dtex.

  When the cross section of the thermoplastic deformed cross section fiber obtained in the present invention is a three-leaf cross section, the diameter (D) of the circumscribed circle of the cross section of the fiber is the diameter (d) of the inscribed circle of the cross section of the fiber. The divided value (D / d) is preferably 1.3 to 4, and more preferably 1.5 to 3. As this value (D / d) is larger, a fiber having better gloss can be obtained, but this causes a decrease in the strength and elongation of the fiber itself.

  Further, when the cross section is a 4-5 leaf cross section, the deformed degree of the thermoplastic deformed cross section fiber is the length of the tangent line (h) from the tangent line drawn on the adjacent convex part to the most concave part. A value {(h / L) × 100} obtained by dividing by (L) and multiplying by 100 is preferably 5 to 40, and more preferably 8 to 30. The larger this value {(h / L) × 100} is, the more glossy fiber can be obtained, but this causes a decrease in the strength and elongation of the fiber itself.

  When the cross section is flat and the lens type cross section is obtained, the ratio of the long axis length L to the short axis length S of the cross section of the fiber is 1 / L / S. 0.5 to 4 is preferable, and 1.7 to 3.5 is more preferable.

  In the thermoplastic modified cross-section fiber obtained in the present invention, the fineness unevenness in the length direction is preferably 1% or less in terms of Worcester (1/2 inert). If the Worcester is 1/2 inert and exceeds 1.2%, the vertical lines, yokomura, etc., particularly when used as a fabric of thin fabric, become conspicuous and the quality deteriorates. More preferably, it is 0.8% or less.

  Hereinafter, the present invention will be described in detail with reference to examples. In addition, the measuring method in an Example used the following method.

A. Worcester spots (1/2 inert)
It was measured with USUTER TESTER MONITOR C manufactured by Zerbegger Worcester Co., Ltd. Measurement conditions are 50 m / min, twist: S1.5, thread tension 1.5, measurement time 2.5 minutes, measurement mode is 1/2 inert, and average deviation rate (U%) is measured. The measurement is performed three times, and the average value is obtained.

B. Fabric quality The green machine created from the test yarns is judged by the following criteria by visual observation of 10 voters.
○: Streaks and unevenness are hardly observed in the fabric.
Δ: Some streaks and unevenness are observed in the fabric.
X: Streaks and unevenness are clearly observed in the fabric.

C. Measuring method of operability The number of yarn breaks when 1 t of thermoplastic deformed cross-section fibers was spun was evaluated according to the following criteria.
○: Less than 2.0 times / t Δ: 2.1 to less than 4.0 times / t ×: 4.1 times / t or more.

D. Method for measuring 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)}

E. Intrinsic viscosity [η]
A sample polymer was dissolved in orthochlorophenol (hereinafter abbreviated as OCP), and a relative viscosity ηr at a plurality of points was obtained using an Ostwald viscometer at a temperature of 25 ° C. and extrapolated to an infinite dilution.

F. Method for measuring strength and elongation JIS L 1013 (1999) 7.5 Tensile strength and elongation The measurement was performed according to a standard time test. A constant-speed tension tester was used, and Tensilon manufactured by Orientec was used for the measurement. As measurement conditions, measurement was performed under the conditions of a gripping interval of 50 cm and a tensile speed of 50 cm / min to obtain the maximum tensile strength, and a value obtained by dividing the tensile maximum strength was defined as strength. As the elongation, the elongation at the maximum tensile strength was determined. The number of measurements was 10 times.

G. Measurement method of cross-sectional variation After cutting a thin section in the cross-sectional direction at an arbitrary position of the fiber, photographing the cross-section of the fiber with a transmission microscope, and printing it out at a magnification of 1000 times (SCT-P66 manufactured by Mitsubishi Electric Corporation), a scanner The image was taken in using (Epson GT-5500WINS) (black-and-white photo, 400 dpi) and magnified 1500 times on the display, and the degree of deformation of 10 single yarns was calculated using image processing software (WINROOF). The standard deviation of the calculated irregularity was obtained and evaluated according to the following criteria.
○: 0.04 or less Δ: 0.05 to 0.06
X: 0.07 or more

  The annular cooling device referred to in this embodiment of the present invention includes an inner blowing annular cooling device that blows cooling air from outside to inside in an annular direction, and a cooling air that blows cooling air from inside to outside in an annular direction. Although there are outer blown annular cooling devices, they are simply referred to as an inner blown annular cooling device and an outer blown annular cooling device.

Example 1
Nylon 6 pellets with a 98% sulfuric acid relative viscosity (ηr) of 2.6 are melted at a spinning temperature of 280 ° C., and as the spinneret, the polymer introduction holes are arranged in a single row in a circle, and 3 discharge holes are formed in each introduction hole. In addition, one slit is parallel and opposed to the cooling air blown from the inner blown annular cooling device that discharges the cooling air from the outside to the inside so that the slit does not overlap between the spinneret center and the cooling air discharge port. A Y-shaped cross-sectional yarn base arranged in the above was used, and two yarns per base were melted and discharged. Subsequently, the yarn is cooled with cooling air with an inner blown ring system and a cooling air temperature of 20 ° C., and after refueling and entanglement, the yarn is taken up by a non-heating roller (first godet roller) and heated at 170 ° C. (second The yarn was stretched 1.5 times with a godet roller, and wound at 4000 m / min to obtain a Y 6 section yarn of nylon 6 with 78 dtex 36 filament (single yarn fineness 2.2 dtex) (an irregularity of 1). .9, strength 3.8, elongation 42.5). The operability was 1.8 times / t.

  Using the obtained Y-shaped cross-section yarns for warp and weft, weaving a taffeta fabric with a warp density of 120 yarns / inch and a weft density of 90 yarns / inch (ZW303, manufactured by Tsuda Koma Co., Ltd.), and the resulting fabric The grade was evaluated. The results are shown in Table 1.

Example 2
As the spinneret, except that the polymer introduction holes are arranged in a row in a circle, and the spinneret for Y cross-section yarn having two discharge holes in one introduction hole, 78 dtex 34 filament (single yarn fineness 2.3 dtex) Was melt-spun in the same manner as in Example 1 to obtain a nylon 6 Y-shaped cross-section yarn (profile 2.1, strength 3.8, elongation 43.2). The operability was 1.4 times / t.

  The obtained Y-shaped cross-sectional yarn was woven in the same manner as in Example 1 using the warp yarn and the weft yarn, and the quality of the obtained fabric was evaluated. The results are shown in Table 1.

Example 3
As the spinneret, except that the polymer inlet holes are arranged in a row in a single row, and the spinneret for Y cross-section yarn with four outlet holes in one inlet hole, 78 dtex 36 filaments (single yarn fineness 2.2 dtex) Was melt-spun in the same manner as in Example 1 to obtain a nylon 6 Y-shaped cross-section yarn (profile 1.8, strength 3.9, elongation 43.8). The operability was 1.8 times / t.

  The obtained Y-shaped cross-sectional yarn was woven in the same manner as in Example 1 using the warp yarn and the weft yarn, and the quality of the obtained fabric was evaluated. The results are shown in Table 1.

Example 4
As the spinneret, except that the polymer introduction holes are arranged in a row in a circle, and the spinneret for Y-section yarn with 5 discharge holes in one introduction hole, 78 dtex 40 filament (single yarn fineness 1.9 dtex) Was melt-spun in the same manner as in Example 1 to obtain a nylon 6 Y-leaf cross-sectional yarn (profile degree 2.0, strength 3.9, elongation 43.7). The operability was 1.7 times / t.

  The obtained Y-shaped cross-sectional yarn was woven in the same manner as in Example 1 using the warp yarn and the weft yarn, and the quality of the obtained fabric was evaluated. The results are shown in Table 1.

Example 5
As the spinneret, melt spinning was carried out in the same manner as in Example 1 except that the spinneret for Y-section yarn with 3 yarns per die and 40 dtex 12 filaments (single yarn fineness 3.3 dtex) were used. A Y-shaped cross-section yarn was obtained (profile degree 2.4, strength 4.4, elongation 43.8). The operability was 1.3 times / t.

  The obtained Y-shaped cross-sectional yarn was woven in the same manner as in Example 1 using the warp yarn and the weft yarn, and the quality of the obtained fabric was evaluated. The results are shown in Table 2.

Example 6
Other than using a spinneret for Y-shaped cross-section yarns with polymer introduction holes arranged in two rows circumferentially in the spinneret and three discharge holes in one introduction hole, 78 dtex 18 filaments (single yarn fineness 4.3 dtex) Was melt-spun in the same manner as in Example 1 to obtain a nylon 6 Y-shaped cross-section yarn (profile degree 2.8, strength 3.0, elongation 41.3). The operability was 2.8 times / t.

  The obtained Y-shaped cross-sectional yarn was woven in the same manner as in Example 1 using the warp yarn and the weft yarn, and the quality of the obtained fabric was evaluated. The results are shown in Table 2.

Example 7
As the spinneret, except that the polymer introduction holes were arranged in two rows in a circumferential manner, and the spinneret for Y-section yarn having three discharge holes in one introduction hole, 40 dtex 48 filament (single yarn fineness 0.83 dtex) Melt spinning was carried out in the same manner as in Example 1 to obtain a nylon 6 Y-shaped cross section yarn (an irregularity of 1.4, a strength of 3.5, an elongation of 40.7). The operability was 2.0 times / t.

  The obtained Y-shaped cross-sectional yarn was woven in the same manner as in Example 1 using the warp yarn and the weft yarn, and the quality of the obtained fabric was evaluated. The results are shown in Table 2.

Example 8
Other than using a spinneret for Y-shaped cross section yarns with polymer introduction holes arranged in two rows in the spinneret and four discharge holes in one introduction hole, 78 dtex 100 filaments (single yarn fineness 0.78 dtex) Was melt-spun in the same manner as in Example 1 to obtain a nylon 6 Y-shaped cross section yarn (an irregularity of 1.2, a strength of 3.2, an elongation of 40.3). The operability was 3.2 times / t.

  The obtained Y-shaped cross-sectional yarn was woven in the same manner as in Example 1 using the warp yarn and the weft yarn, and the quality of the obtained fabric was evaluated. The results are shown in Table 2.

Example 9
Nylon 6 Y-shaped cross-section yarn of 78 dtex 36 filaments (single yarn fineness 2.2 dtex) was carried out in the same manner as in Example 1 except that the polymer introduction holes were arranged in a four-row array in the spinneret. A strip was obtained (profile 1.9, strength 3.8, elongation 42.5). The operability was 2.8 times / t.

  The obtained Y-shaped cross-sectional yarn was woven in the same manner as in Example 1 using the warp yarn and the weft yarn, and the quality of the obtained fabric was evaluated. The results are shown in Table 3.

Example 10
Melt spinning was carried out in the same manner as in Example 1 except that the cooling system was an outer blown annular cooling device, 78 dtex 36 filament (single yarn fineness 2.2 dtex), and a nylon 6 Y-shaped section yarn was obtained ( Deformity 1.9, strength 3.8, elongation 42.4). The operability was 1.8 times / t.

  The obtained Y-shaped cross-sectional yarn was woven in the same manner as in Example 1 using the warp yarn and the weft yarn, and the quality of the obtained fabric was evaluated. The results are shown in Table 3.

Example 11
As the spinneret, except that the polymer introduction holes are arranged in a row in a circumferential manner, and the spinneret for five-leaf cross-section yarn with five discharge holes in one introduction hole, 78 dtex 40 filaments (single yarn fineness 1.9 dtex) Was melt spun in the same manner as in Example 1 to obtain a nylon 6 five-leaf cross-sectional yarn (profile 16, strength 3.5, elongation 41.7). The operability was 1.9 times / t.

  The obtained 5-leaf cross-sectional yarn was woven in the same manner as in Example 1 using the warp yarn and the weft yarn, and the quality of the obtained fabric was evaluated. The results are shown in Table 3.

Example 12
Except that the spinneret was a spinneret for X-shaped cross-section yarn and 78 dtex 36 filament (single yarn fineness 2.2 dtex), melt spinning was performed in the same manner as in Example 1 to obtain a nylon 6 X-shaped cross-section yarn. (Deformation degree 18, strength 3.7, elongation 42.0). The operability was 1.8 times / t.

  The obtained X-shaped cross-sectional yarn was used for warp and weft yarns in the same manner as in Example 1, and the quality of the obtained fabrics was evaluated. The results are shown in Table 3.

Example 13
As the spinneret, a spinneret for X-shaped cross-sectional yarn arranged so that two slits overlap between the center of the spinneret and the cooling air outlet is used, and 78 dtex 36 filament (single yarn fineness 2.2 dtex) Except for the above, melt spinning was carried out in the same manner as in Example 1 to obtain a nylon 6 X-shaped cross section yarn (an irregularity of 16, a strength of 3.6, an elongation of 42.3). The operability was 2.2 times / t.

  The obtained X-shaped cross-sectional yarn was used for warp and weft yarns in the same manner as in Example 1, and the quality of the obtained fabrics was evaluated. The results are shown in Table 4.

Example 14
As a spinneret, melt spinning was carried out in the same manner as in Example 1 except that a flat cross-section yarn base and 78 dtex 36 filament (single yarn fineness 2.2 dtex) were used to obtain a nylon 6 flat cross-section yarn. (Deformation degree 2.3, strength 3.9, elongation 42.6). The operability was 1.6 times / t.

  The obtained flat cross-sectional yarn was woven in the same manner as in Example 1 using warp yarn and weft yarn, and the quality of the obtained fabric was evaluated. The results are shown in Table 4.

Example 15
A single slit is provided for the cooling air blown from the inner blow ring device for arranging the polymer introduction holes in the spinneret in a circular pattern in the circumferential direction and discharging the cooling air from the three discharge holes and from the outside to the inside. Nylon 6 Y-shaped cross-section yarn was obtained (strength 3.4, elongation 42.3) except that the yarns were melt-spun in the same manner as in Example 1 except that they were parallel and opposed and arranged in a straight line. The operability was 3.8 times / t.

  The obtained Y-shaped cross-sectional yarn was woven in the same manner as in Example 1 using the warp yarn and the weft yarn, and the quality of the obtained fabric was evaluated. The results are shown in Table 4.

Example 16
Nylon 66 pellets with a 98% sulfuric acid relative viscosity (ηr) of 2.6 are melted at a spinning temperature of 292 ° C., and as the spinneret, the polymer introduction holes are arranged in a row in a circumferential manner, and 3 discharge holes are formed in each introduction hole. In addition, one slit is parallel and opposite to the cooling air blown from the inner blowing annular device that discharges the cooling air from the outside to the inside so that there is no overlap of the slits from the spinneret center to the cooling air discharge port. The bases for the Y-shaped cross-sectional yarns arranged were used and melted and discharged with 2 threads per base. Next, the yarn is cooled with cooling air with an internal blown ring system and a cooling air temperature of 20 ° C, and after lubrication and entanglement, it is taken up with a non-heating roller (first godet roller), and a 170 ° C heating roller (second gody roller) ) And wound up at 4000 m / min to obtain a Y-shaped cross-section yarn of 78 dtex 36 filament (single yarn fineness 2.2 dtex) nylon 66 (profile 1. 8, strength 4.3, elongation 44.1). The operability was 2.0 times / t.

  The obtained nylon 66 Y-shaped cross-section yarn was used for warp and weft yarns in the same manner as in Example 1, and the quality of the obtained fabric was evaluated. The results are shown in Table 4.

Example 17
Polyethylene terephthalate homopolymer pellets having a polymer intrinsic viscosity IV of 0.65 were melted at 294 ° C., and as a spinneret, the polymer introduction holes were arranged in a row in a circumferential manner, with one introduction hole having three discharge holes and from the outside One slit is parallel and opposed to the cooling air blown out from the inner blowing annular device that discharges the cooling air into the inside, and Y is arranged so that there is no overlap of the slits from the spinneret center to the cooling air discharge port A die for a die section yarn was used, and two yarns per die were melted and discharged. Subsequently, the yarn is cooled with cooling air with an inner blow ring system and a cooling air temperature of 20 ° C., and after refueling and entanglement, the yarn is taken up through the first and second rollers, and wound at 4000 m / min. A 80-decitex 54 filament (single yarn fineness 1.5 decitex) polyethylene terephthalate Y-leaf cross-section yarn was obtained (profile degree 2.0, strength 2.8, elongation 39.7). The operability was 1.5 times / t.

  The obtained polyethylene terephthalate Y-shaped cross-section yarn was used for warp and weft yarns in the same manner as in Example 1, and the resulting fabric quality was evaluated. The results are shown in Table 5.

Example 18
Nylon 6 pellets having a 98% sulfuric acid viscosity (ηr) of 2.6 were added to 100 parts by weight of cellulose (cotton linter), and 240 parts by weight of acetic acid and 67 parts by weight of propionic acid were added and mixed at 50 ° C. for 30 minutes. After the mixture was cooled to room temperature, 172 parts by weight of acetic anhydride cooled in an ice bath and 168 parts by weight of propionic anhydride were added as an esterifying agent, and 4 parts by weight of sulfuric acid was added as an esterification catalyst, followed by stirring for 150 minutes. An esterification reaction was performed. In the esterification reaction, when it exceeded 40 ° C., it was cooled in a water bath. After the reaction, a mixed solution of 100 parts by weight of acetic acid and 33 parts by weight of water was added as a reaction terminator over 20 minutes to hydrolyze excess anhydride. Thereafter, 333 parts by weight of acetic acid and 100 parts by weight of water were added, and the mixture was heated and stirred at 80 ° C. for 1 hour. After completion of the reaction, an aqueous solution containing 6 parts by weight of sodium carbonate was added, and the precipitated cellulose acetate propionate was filtered off, subsequently washed with water, and dried at 60 ° C. for 4 hours. 82% by weight of cellulose acetate propionate, 17.9% by weight of polyethylene glycol (PEG 600) having an average molecular weight of 600 and bis (2,6-di-t-butyl-4-methylphenyl) pentaerythritol as a phosphorus-based antioxidant Diphosphite 0.1% by weight was kneaded at 230 ° C. using a biaxial extruder and cut to about 5 mm to obtain cellulose fatty acid mixed ester composition pellets (Mw 16,000,000).

  This pellet is melted at a spinning temperature of 260 ° C., and as a spinneret, polymer introduction holes are arranged in a line in a circle, and an inner blowing annular device that discharges cooling air from the outside into three discharge holes and from the outside to the inside Using a die for Y-shaped cross-sectional yarn, in which one slit is parallel and opposite to the cooling air blown from the nozzle, and is arranged so that there is no overlap of the slit between the center of the spinning nozzle and the cooling air discharge port. It was melted and discharged with two threads per die. Subsequently, the yarn is cooled by cooling air with an inner blow ring system and a cooling air temperature of 20 ° C., and after refueling and entanglement, the yarn is taken up via the first and second rollers, and wound at 2000 m / min. , 80 decitex 54 filaments (single yarn fineness 1.5 decitex) cellulose ester Y-shaped cross-section yarn was obtained (modified degree 1.9, strength 1.1, elongation 26.3). The operability was 1.8 times / t.

  The obtained Y-shaped cross-section yarn of cellulose ester was used for warp and weft yarns in the same manner as in Example 1, and the obtained fabric quality was evaluated. The results are shown in Table 5.

Comparative Example 1
Melt spinning was carried out in the same manner as in Example 1 except that the annular method was changed from the internal blown annular cooling device to the uniflow method, 78 dtex 36 filament (single yarn fineness 2.2 dtex), and the Y-shaped cross section yarn of nylon 6 was formed. Obtained (profile degree 1.7, strength 4.2, elongation 41.5). The operability was 3.1 times / t.

  The obtained Y-shaped cross-sectional yarn was woven in the same manner as in Example 1 using the warp yarn and the weft yarn, and the quality of the obtained fabric was evaluated. The results are shown in Table 6.

Comparative Example 2
As the spinneret, melt spinning was carried out in the same manner as in Example 1 except that a round cross-section yarn base and 78 dtex 36 filament (single yarn fineness 2.2 d dtex) were used, and a nylon 6 round cross-section yarn was obtained. (Strength 4, elongation 46.0). The operability was 1.5 times / t.

  The obtained round cross-section yarn was woven in the same manner as in Example 1 using the warp yarn and the weft yarn, and the quality of the obtained fabric was evaluated. The results are shown in Table 6.

Comparative Example 3
As the spinneret, melt spinning was carried out in the same manner as in Example 1 except that a 78 dtex 36 filament (single yarn fineness 2.2 dtex) was used, in which one slit was parallel and opposed to the spinneret center. 6 Y-shaped cross-section yarns were obtained (difference degree 1.6, strength 3.8, elongation 41.3). The operability was 2.8 times / t.

  The obtained round cross-section yarn was woven in the same manner as in Example 1 using the warp yarn and the weft yarn, and the quality of the obtained fabric was evaluated. The results are shown in Table 6.

  As can be seen from the results shown in Tables 1 to 6, the modified cross-section yarn cap (Example 1 to Example 18) of the present invention has at least one slit among all the discharge holes having an irregular shape. , Because it is parallel and opposite to the cooling air blown out from the annular cooling device, stable production is possible with melt-spun thermoplastic deformed cross-section fibers, good Worcester spots, and good quality with little cross-section variation It turns out that it is a raw yarn. Furthermore, it turns out that it becomes a high quality and high quality product also when it is set as a fabric.

  This is a case where the number of odd-shaped discharge holes in the discharge introduction hole group is an odd number, and when one is arranged on a straight line passing through the center of the spinneret (Example 1, Example 4, Example 5, Example 6, Example 7, Example 9, Example 10, Example 11, Example 12, Example 14, Example 16, Example 17, Example 18) are particularly excellent in Worcester spots and cross-sectional variations.

  The same applies to the case where the number of irregular discharge holes in the discharge introduction hole group is an even number and the irregular discharge holes are not arranged on a straight line passing through the center of the spinneret (Example 2, Example 3, Example 8).

  That is, regardless of whether the number of ejection holes is even or odd, by maintaining a uniform pitch between holes, the air passage through the cooling air is improved, a high cooling effect is exhibited, and Worcester spots and cross-sectional variations are more excellent.

  On the other hand, in the conventional cooling method (Comparative Example 1), thick and thin spots are generated due to insufficient cooling, the Worst spots are deteriorated, the cross-sectional shape is uneven, and the fabric quality is poor even when the fabric is used. . In addition, when one slit is parallel and opposed to the center of the base (Comparative Example 3), thick spots due to insufficient cooling occur, Worcester spots are deteriorated, cross-sectional variation is generated, and the fabric is made. It can be seen that the fabric quality is poor even in the phase.

FIG. 1 is an example of a spinneret for obtaining a modified cross-section fiber of the present invention. FIG. 2 is an example of a schematic view of a polymer introduction hole array perforated in a spinneret for obtaining a modified cross-section fiber of the present invention. FIG. 3A is an enlarged view of a portion A illustrated in FIG. 2, and in the spinneret of the modified cross-section fiber of the present invention, all of the irregular discharge holes are cooled with respect to the cooling air when the cooling method is the inner blow cooling method. FIG. 3B is an example of a schematic view in which one slit is parallel and opposite to the direction of the cooling air of the annular cooling device, and FIG. 3B is an enlarged view of part A illustrated in FIG. In the spinneret for obtaining fibers, one slit is formed in all of the irregularly shaped discharge holes in parallel with the direction of the cooling air of the annular cooling device and is opposed to the cooling air in which the cooling method is the external blow cooling method. . FIG. 4A is an enlarged view of a portion A illustrated in FIG. 2, and in the spinneret for obtaining the irregular cross-section fiber of the present invention, a variant whose cooling method is closest to the cooling air outlet when the inner blow cooling method is used. FIG. 4B is an example of a schematic view in which at least one slit of the discharge hole is parallel and opposite to the direction of the cooling air, and FIG. 4B is an enlarged view of part A illustrated in FIG. FIG. 5 is an example of a schematic diagram showing that at least one slit of a deformed discharge hole that is closest to a cooling air blowing outlet in the spinneret when the cooling method is an external blowing cooling method is parallel and opposite to the cooling air direction. FIG. 5 (a) is an enlarged view of part A illustrated in FIG. 2, and in the spinneret for obtaining the irregular cross-section fiber of the present invention, a linear arrangement with respect to the cooling air when the cooling method is the inner blow cooling method. FIG. 5 (b) is an enlarged view of part A illustrated in FIG. 2, and the cooling method in the modified cross-section fiber spinneret of the present invention is the cooling air in the external blow cooling method. It is an example of the schematic which shows the arrangement | sequence on a straight line with respect to it. FIG. 6 (a) is an example of a schematic diagram of a modified cross-section fiber spinneret having three discharge holes perforated in each polymer introduction hole of the present invention and forming slits parallel to and facing the direction of the cooling air. FIG. 6 (b) is a schematic diagram of a modified cross-section fiber spinneret in which the number of discharge holes perforated in each polymer introduction hole of the present invention is 5, and the slit is parallel and opposed to the direction of the cooling air. It is an example. FIG. 7 (a) is an example of a schematic view of a modified cross-section fiber spinneret having two discharge holes perforated in each polymer introduction hole of the present invention and forming slits parallel to and facing the direction of the cooling air. FIG. 7 (b) is a schematic view of a modified cross-section fiber spinneret having four discharge holes perforated in each polymer introduction hole of the present invention and forming slits parallel to and facing the direction of the cooling air. It is an example. FIG. 8 is a schematic diagram illustrating the spinneret center (R) and the cooling air outlet (P) of the cooling device of the present invention.

Explanation of symbols

1 cap 2 discharge hole 3 direction of cooling air 4 cooling device (annular chimney)
B Polymer introduction hole center point R Base center r Discharge hole center point P Cooling air outlet

Claims (9)

  A spinneret that is provided immediately below a spinneret that discharges a molten polymer, and that discharges thermoplastic deformed cross-section fibers using an annular cooling device that blows cooling air from an outer annular direction around a discharge line. All of the discharge holes have a deformed shape having slits, and at least one of the discharge holes having the deformed shape is parallel to and opposed to the cooling air blown from the annular cooling device. A spinneret characterized by being provided.   The spinneret has a plurality of discharge introduction hole groups arranged concentrically, and one slit of all the irregular discharge holes in the discharge introduction hole group is parallel to the direction of the cooling air of the annular cooling device. 2. The spinneret according to claim 1, wherein the spinneret is provided oppositely.   The spinneret has a plurality of discharge introduction hole groups arranged concentrically, and at least one slit of the irregular discharge hole forming a filament closest to the cooling air outlet in the discharge introduction hole group is annular. The spinneret according to claim 1, wherein the spinneret is provided in parallel and opposite to the direction of the cooling air of the cooling device.   When the number of irregular discharge holes in the plurality of discharge introduction hole groups is an odd number, the irregular discharge holes are arranged in line symmetry with respect to the direction of the cooling air of the annular cooling device, and on a straight line passing through the spinneret center 4. The spinneret according to claim 2 or 3, wherein one spinneret is arranged in each.   When the number of irregular discharge holes in the plurality of discharge introduction hole groups is an even number, the irregular discharge holes are not arranged on a straight line passing through the spinneret center with respect to the direction of the cooling air of the annular cooling device. The spinneret according to any one of claims 2 to 4, wherein the spinneret is formed.   The odd-shaped discharge holes in the discharge introduction hole group are arranged in a straight line when two, and are arranged in a regular polygon when there are three or more. The spinneret described.   The spinneret according to any one of claims 2 to 6, wherein the discharge introduction hole group is arranged in a row or concentric circles in a row.   8. The discharge introduction hole group has 2 to 5 discharge holes, is arranged in a line in a ring shape, and has 2 to 5 slits of irregular discharge holes. 9. The spinneret described.   A method for producing a thermoplastic irregular cross-section fiber, comprising melt-spinning a thermoplastic irregular cross-section fiber using the spinneret according to claim 1.

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