JP5998673B2 - Drum-like package of polylactic acid monofilament and method for producing the same - Google Patents

Description

  The present invention relates to a drum package of polylactic acid monofilament. More specifically, the present invention relates to a drum package of polylactic acid monofilament for obtaining a thin fabric for organdy or a fabric for tea bags. Also, to provide a method for producing a polylactic acid monofilament drum-shaped package that can control a winding tension and a godet roller temperature to form a good drum-shaped package with no yarn dropping on the package end face and obtain a high-quality woven fabric. It is.

  Recently, biodegradable polymers utilizing biomass have attracted attention as one of the environmental conservation measures, and polylactic acid polymers have attracted particular attention as biodegradable polymers. Polylactic acid polymer is a polymer made from lactic acid obtained by fermenting starch extracted from plants. Among biodegradable polymers using biomass, it has a balance of transparency, mechanical properties, heat resistance, and cost. The best.

  In general, a polylactic acid monofilament is produced by a straight splitting method (Patent Document 1) in which multifilaments are once obtained and then split one by one, and a two-step method in which the yarn is once wound after spinning and then stretched. (Patent Document 2) and high-speed direct spinning method (one-step method). Depending on the manufacturing method, the winding form becomes a drum-like package obtained from a high-speed direct spinning method, a sarn-like package obtained from a straight splitting method and a two-step method. From the viewpoint of the production cost of polylactic acid monofilament, the one-step method is superior to the two-step method and the straight splitting method. However, as described in Patent Document 1, the straight splitting method is mainly used in terms of quality and spinnability. It has expanded to industrial production. However, further cost reduction is desired, and industrial production application by a one-step method is desired.

  As a method for producing polylactic acid multifilaments developed in industrial production, a method (Patent Document 3) for producing oriented crystallized fibers (POY) by a high-speed direct spinning method has been proposed. In the example of Patent Document 3, it is described that the first godet roller (non-heated roller) is taken up at a spinning speed of 4500 m / min, and subsequently wound up via the second godet roller (non-heated roller). When a polylactic acid monofilament was produced by this method, many yarn drops on the package end face occurred. Patent Document 3 [0031] describes that when a polylactic acid fiber crystallized by high speed spinning is used as a drawn yarn, it is drawn at a drawing temperature of 90 ° C. or higher and heat-set.

JP 2010-84286 A Japanese Patent Application No. 2001-505594 JP 2006-274520 A JP 2010-211122 A

  When the present inventors manufactured polylactic acid monofilaments by the method described in the example of Patent Document 3, many yarn drops on the package end face occurred. Patent Document 3 [0031] describes that when a polylactic acid fiber oriented and crystallized by high-speed spinning is used as a drawn yarn, it is drawn at a drawing temperature of 90 ° C. or higher and heat-set. When the polylactic acid monofilament was manufactured, a lot of thread dropping occurred on the package end face. In particular, polylactic acid fibers have poor crystal orientation, and high-speed winding and thermal stretching are necessary for crystal orientation in the production of polylactic acid fibers. It was difficult for polylactic acid monofilaments.

  Monofilaments have a larger yarn diameter at the same fineness than multifilaments, and the contact area between the yarns itself is reduced, so the frictional force between the yarns decreases, and the yarn does not fully grip and slide on the end surface of the package, which is the return surface of the yarn. It has the property that it is easier to fall off than multifilaments. For example, if warping and weaving, which is the next process, is performed using a monofilament consisting of a drum-shaped package with the yarn dropped, the yarn drop part will be caught on the end face when the yarn is unwound, resulting in yarn breakage or tension fluctuation. Therefore, providing a drum-shaped package with no thread drop and manufacturing a drum-shaped package are extremely important issues.

  The present invention is intended to solve the above-mentioned problems of the prior art, and provides a good drum-shaped package that can give an excellent woven fabric with higher quality than conventional polylactic acid monofilaments, and has no thread dropping. Another object of the present invention is to provide a method for efficiently obtaining such a polylactic acid monofilament drum package.

In order to achieve the above object, the present invention adopts the following configuration.
(1) In a drum-shaped package composed of polylactic acid monofilaments composed of 50% by weight or more of a lactic acid monomer, the tensile strength of the polylactic acid monofilament is 2.0 cN / dtex or more , and the tension of the polylactic acid monofilament in the inner layer portion and the outer layer portion of the package intensity ratio der (tensile strength of tensile strength / package outer layer monofilament package inner part monofilament) is 0.9 or more is, and the package winding thickness direction winding diameter a (mm) and a length of 10mm or more in the package end face of A drum package of polylactic acid monofilaments, wherein the number S of thread droppings (pieces) has a relationship of the following formulas (I) and (II):
A ≧ 20 (I)
S / (A-10) ≦ 0.025 (II)
(2 ) The polylactic acid monofilament drum-like package according to (1 ) , wherein the lightness of the polylactic acid monofilament is 62 or less.
( 3 ) Tensile strength ratio of polylactic acid monofilament in the polylactic acid package inner layer portion and outer layer portion after 6 months from package formation (tensile strength of the monofilament inside the package inner layer after 6 months / tensile strength of the monofilament outside package after 6 months) ) Is 0.9 or more, The drum package of the polylactic acid monofilament according to (1) or (2) .
( 4 ) Tensile strength ratio of polylactic acid monofilament between the polylactic acid package inner layer portion after one month of package formation and the polylactic acid package inner layer portion after six months of package formation (tensile strength of the monofilament within the package inner layer portion after six months / 1 The drum-shaped package of polylactic acid monofilament according to any one of (1) to ( 3 ), wherein the tensile strength of the inner monolayer of the package after a lapse of months is 0.9 or more.
( 5 ) The polylactic acid monofilament in which 50% by weight or more melted and discharged is composed of a lactic acid monomer is cooled and heated and stretched at 50 ° C. to 150 ° C., the winding speed is 1500 to 5000 m / min, and the winding tension is 0. The method for producing a polylactic acid monofilament drum-shaped package according to (1), wherein winding is performed at 04 cN / dtex to 0.20 cN / dtex.
(6), wherein the winding the rolled stretching force 0.04cN / dtex~0.35cN / dtex (5) the production method of the polylactic acid monofilament drum-shaped package as defined.

  According to the present invention, it is possible to efficiently obtain a good drum-shaped package that can give a high-quality woven fabric and has no yarn drop on the drum end surface. The polylactic acid monofilament package thus obtained is useful for thin fabrics such as organdy and tea bags.

FIG. 1a is a package cross-sectional view schematically showing a winding form of a drum-shaped package, and FIG. 1b is a front view thereof. It is the schematic of an example of the spinning apparatus preferably used by this invention.

  Hereinafter, embodiments of the present invention will be described in detail.

  A drum package made of the polylactic acid monofilament of the present invention will be described with reference to FIG. FIG. 1a is a package cross-sectional view schematically showing a winding form of a drum-shaped package, and FIG. 1b is a front view thereof, showing a winding diameter A (mm) in the package winding thickness direction and a winding diameter in the package winding thickness direction. In FIG. 1a, the maximum part of B is shown in B (mm), the minimum part of the winding diameter in the package winding thickness direction is C (mm), and the winding width D (mm) in the package winding width direction.

  About the drum package made of the polylactic acid monofilament of the present invention, the thread drop is the winding diameter A in the package thickness direction from the position 10 mm from the innermost layer in the package thickness direction to the outermost layer and the length 10 mm or more on the package end surface. It is necessary that the number S (pieces) of thread dropping satisfies the relational expression S / (A-10) ≦ 0.025 (pieces / mm). In addition, the number of thread droppings referred to here is the region shown in FIG. 1B, that is, the region from the innermost layer to the outer layer part on the package end surface in the package winding thickness direction, and the length generated on both end surfaces of the package. This is the number of thread drops of 10 mm or more. In addition, the thing straddling the position of 10 mm from the innermost layer is not counted.

  A value (S / (A-10)) calculated from the area (A-10) from the position of 10 mm from the innermost layer to the outer layer portion was used as an index of thread dropping. By having this thread drop S / (A-10) in the range of 0.025 pieces / mm or less, it is possible to maintain good operability and to achieve stable production by warping and weaving which are the next steps. it can. More preferably, it is 0.015 piece / mm or less.

  The drum-shaped package made of the polylactic acid monofilament of the present invention needs to have a winding diameter A in the package winding thickness direction of 20 mm or more. When the winding diameter A is less than 20 mm, even if the thread drop S / (A-10) exceeds 0.025 pieces / mm, it does not catch on the package end surface, and the yarn is unwound smoothly and there is no problem. However, a drum-shaped package having a winding diameter A of less than 20 mm has a small winding amount and cannot be said to be an efficient production. Therefore, when the winding diameter A is 20 mm or more, more industrially beneficial and efficient production is achieved. More preferably, it is 35 mm or more. The upper limit is not particularly specified, but is preferably 150 mm or less in consideration of product transportation and handling in the next process.

  The drum-shaped package made of the polylactic acid monofilament of the present invention has a tension fluctuation that causes the thread drop part to get caught on the end surface of the package when unwinding the thread, causing breakage of the thread or sinking when made into a woven fabric. A high-quality polylactic acid woven fabric can be obtained without causing this, but it is particularly effective when the weight of the drum-shaped package is 0.30 kg or more, and more preferably 0.50 kg or more. The upper limit is not particularly specified, but is preferably 3.0 kg or less in consideration of product transportation and handling in the next process.

  Since the package foam affects the unwinding property of the yarn in the next process, a good package foam is required. As a defect other than thread drop in package foam, there is a saddle represented by the difference (BC) between the end winding diameter B in the package winding thickness direction and the minimum winding diameter C in the package winding thickness direction. Smaller ones are better at unwinding yarn at high speed. The unwinding speed required in the next step reaches 100 to 1000 m / min. However, if the saddle is high, the saddle portion is continuously scratched by the unwinding yarn, so that the polylactic acid fiber with low wear resistance is used. As a result, the defect of the surface of the package coincides with the package end period (corresponding to the yarn length from the saddle to the other saddle). Further, since the unwinding tension of the yarn tends to fluctuate in the saddle portion, it becomes an unstable factor in the next process. Therefore, the saddle (BC) is preferably 7 mm or less, more preferably 5 mm or less, and even more preferably 3 mm or less in order to suppress end face period defects in the next step and perform stable high-speed unwinding. . The lower limit is not particularly specified, but is ideally 0 mm.

  The method for producing a drum-shaped package comprising polylactic acid monofilaments of the present invention is a so-called one-step production method in which a polylactic acid polymer is wound by melting, discharging, cooling, and hot drawing, and is produced by a direct spinning drawing method. FIG. 2 is a schematic view of an example of a spinning device preferably used in the present invention. The spin block 1 in the melt spinning machine is heated by heating means (not shown). A spinneret 2 is attached to the spin block 1, a polylactic acid polymer is melted, and the polymer is discharged from the spinneret 2 to form a spun yarn F (hereinafter referred to as “yarn F”). After the yarn F is uniformly cooled by the cooling device 3 in which cooling air is generated from one direction provided in the first direction, an oil agent is applied to the yarn F by the oil supply device 5 via the spinning duct 4, and the first godet roller 6, After stretching between 6 ′ and the second godet rollers 7, 7 ′, a winding drum-like package is formed by the winding device 8. With this configuration, a drum package of polylactic acid monofilament can be obtained with high productivity.

  In the method for producing the polylactic acid monofilament of the present invention, the application of the oil agent is performed using a known spinning oil agent or oil supply device. The smoothing agent and emulsifier component in the oil component applied to the yarn include ester-based, mineral oil-based, ether ester-based smoothing agents, ether-type nonionic surfactants having a polyoxyalkylene group in the molecule, and many other types. Examples thereof include a monohydric alcohol partial ester type nonionic surfactant and a polyoxyalkylene polyhydric alcohol fatty acid ester type nonionic surfactant. Examples of the oiling device include an oiling roller method and an oiling guide method.

  In the method for producing a drum-shaped package comprising the polylactic acid monofilament of the present invention, the winding tension is wound at 0.04 cN / dtex to 0.20 cN / dtex. This winding tension can be controlled by, for example, the speed difference between the first godet rollers 6, 6 ′ and the second godet rollers 7, 7 ′ or the speed difference between the second godet rollers 7, 7 ′ and the winding device 8. . By setting the winding tension to 0.04 cN / dtex or more, the winding can be performed with stable operation. Further, by setting the winding tension to 0.20 cN / dtex or less, it is possible to form a drum-shaped package without the yarn dropping from the end surface of the package when the traverse is turned back. When the winding tension is less than 0.04 cN / dtex, yarn drop from the package end face can be suppressed, but yarn breakage during spinning tends to occur. On the other hand, when the winding tension exceeds 0.20 cN / dtex, yarn slip occurs when the yarn is folded back, and the yarn falls from the end surface of the package, and yarn breakage is likely to occur in the next step. A preferable range is a winding tension of 0.07 cN / dtex to 0.15 cN / dtex, and a more preferable range is 0.08 cN / dtex to 0.12 cN / dtex. By winding with a winding tension in such a range, it is possible to suppress yarn dropping from the package end face and to achieve stable operability.

  Further, since the winding is a high-speed direct spinning drawing method, the winding speed is preferably 1500 to 5000 m / min. The productivity is improved by setting the winding speed to 1500 m / min or more, while the occurrence of yarn dropping is suppressed by setting the winding speed to 5000 m / min or less. As a result, as described above, the operation / quality in the next process is improved. More preferably, it is the range of 2000 m / min-4000 m / min. More preferably, it is in the range of 2500 m / min to 3500 m / min.

The stretching tension is preferably 0.04 cN / dtex to 0.35 cN / dtex. By setting the drawing tension to 0.04 cN / dtex or more, the yarn is tensioned at the time of drawing, and the yarn swaying and the yarn separating property from the roller are improved, thereby stably spinning. On the other hand, by setting the drawing tension to 0.35 cN / dtex or less, the tension at the time of drawing can be optimized, and the devitrification phenomenon described later can be suppressed, and the quality loss due to the thread breakage and whitening of the next process due to strength reduction is improved. To do. Therefore, it is preferably in the range of 0.10 cN / dtex to 0.30 cN / dtex. More preferably, it is the range of 0.15 cN / dtex-0.25 cN / dtex.
Here, the stretching tension can be controlled in the process of stretching the yarn, for example, the speed difference between the first godet rollers 6 and 6 ′ and the second godet rollers 7 and 7 ′.

Furthermore, the winding width D in the package winding width direction is preferably 20 to 150 mm. By setting it to 20 mm or more, the number of times the yarn is traversed per unit time is reduced, damage to the traverse tip and trouble of the traverse device are suppressed, and the winding diameter of the drum when winding the same weight is increased. You can solve too many problems. On the other hand, by adjusting the distance of the package from the unwinding side to the anti-unwinding side (package winding width) by making it 150 mm or less, instantaneous tension fluctuation at the time of unwinding is suppressed, and the next process Improved quality and operation. More preferably, it is the range of 50-90 mm.
Furthermore, it is preferable that 1 traverse yarn length is 1.1-2.0 m. One traverse yarn length represents the winding yarn length per reciprocation of the traverse. If one traverse yarn length is too long, the yarn length exposed on the package end surface becomes too long, and there is a difference in partial shrinkage rate. And tension during unwinding tends to increase. On the other hand, if the length is too short, the instantaneous tension during winding is large, and the amount of yarn accumulated at the package end face turn-back portion tends to increase, and the tension during unwinding tends to increase.

  In the method for producing a drum-shaped package comprising the polylactic acid monofilament of the present invention, the heat stretching is usually performed using a godet roller, and the heat stretching temperature needs to be 50 ° C to 150 ° C. The heat stretching is preferably performed using a heated godet roller, and the godet roller temperature is a value measured with a contact-type thermometer.

  The godet roller includes, for example, a first godet roller and a second godet roller. Since the godet roller increases the followability of the yarn, it is preferable to use a Nelson godet roller in which two godet rollers are paired. Taking over is performed by the first godet roller, and stretching is performed between godet rollers having different speeds. For example, in the case of one-stage stretching, it is performed between the first and second godet rollers. In the case of two-stage stretching, it is performed between the first and second godet rollers and between the second and third godet rollers. The stretching ratio and the number of stretching stages may be any number, but the stretching ratio is preferably 3.0 to 4.0 times and one-stage stretching.

  Moreover, the godet roller temperature is in the range of 50 ° C. to 150 ° C., respectively. When the take-out godet roller (first godet roller) temperature is less than 50 ° C. (including non-heated), the polylactic acid polymer is stretched below the glass transition temperature, the stress during stretching increases, and the stretch becomes non-uniform, and the crystal structure in the longitudinal direction Spots appear, causing devitrification and a decrease in tensile strength. In addition, the quality of the fabric is degraded due to unevenness and insufficient strength. In particular, in the case of high-speed winding at 1500 m / min or more, the fiber deformation speed of the polylactic acid fiber is fast, the passing time of the take-up godet roller (first godet roller) is short, and preheating necessary for drawing tends to be insufficient. When it is stretched in a state of insufficient preheating, it becomes non-uniform stretching, crystal structure spots are generated in the longitudinal direction, devitrification phenomenon and strength reduction are likely to occur, and it is preferably 85 ° C. or higher for sufficient preheating. More preferably, it is 95 ° C. or higher. On the other hand, when the first godet roller temperature exceeds 150 ° C., it becomes near the melting point of the polylactic acid polymer, a fusing phenomenon occurs, and spun yarn breakage occurs. In addition, the spinning tension is lowered and a lot of yarn dropping occurs. More preferably, it is 115 degrees C or less.

  When the stretching godet roller (after the second godet roller) temperature is less than 50 ° C. (including non-heated), the orientation crystallinity is low, the thermal shrinkage rate of the polylactic acid monofilament is high, especially the boiling water shrinkage rate exceeds 50%, etc. There arises a problem that processing cannot be performed depending on the thermoforming temperature in the next process. The temperature is preferably 95 ° C. or higher from the viewpoint of increasing the orientation crystallinity and decreasing the thermal shrinkage rate. On the other hand, when the stretching godet roller temperature exceeds 150 ° C., it becomes near the melting point of the polylactic acid polymer, a fusing phenomenon occurs, and spun yarn breakage occurs. In addition, the winding tension is lowered and a lot of thread dropping occurs. More preferably, it is 130 degrees C or less.

  In addition, as described above, the take-up godet roller (first godet roller) and the drawing godet roller (after the second godet roller) have different roles, so that either one should satisfy 50 ° C to 150 ° C. However, when both godet rollers produce polylactic acid monofilaments at 50 ° C. to 150 ° C., high-speed winding and thermal stretching can be performed stably at the same time, and industrial production can be realized.

The polylactic acid polymer used in the present invention is a polymer having-(O-CHCH ₃ -CO) n- as a repeating unit, and is obtained by polymerizing lactic acid and other oligomers of lactic acid such as lactide. Since lactic acid has two types of optical isomers, D-lactic acid and L-lactic acid, the polymer is poly (D-lactic acid) consisting only of D isomer and poly (L-lactic acid) consisting only of L isomer, and There is a polylactic acid polymer composed of both. The optical purity of D-lactic acid or L-lactic acid in the polylactic acid polymer is lowered, the crystallinity is lowered, and the melting point drop is increased. Therefore, the optical purity is preferably 90% or more in order to improve heat resistance. However, apart from the system in which two types of optical isomers are simply mixed as described above, the two types of optical isomers are blended and formed into a fiber, and then subjected to a high temperature heat treatment at 140 ° C. or higher. A stereo complex in which a racemic crystal is formed is more preferable because the melting point can be dramatically increased.

  Further, the polylactic acid monofilament in the present invention needs to have a ratio of lactic acid monomer constituting the polymer of 50% by weight or more from the viewpoint of biomass utilization and biodegradability. The lactic acid monomer constituting the polymer is preferably 75% by weight or more, more preferably 96% by weight or more. However, components other than lactic acid may be copolymerized as long as the properties of polylactic acid within this range are not impaired.

The molecular weight of the polylactic acid polymer is 50,000 to 350,000 in terms of weight average molecular weight, and the balance between mechanical properties and moldability is good, and more preferably 100,000 to 250,000.
Further, if necessary, the polylactic acid polymer used in the present invention may be blended with a thermoplastic polymer other than polylactic acid, or may be composited (core-sheath, bimetal). Further, matting agents, pigments, light stabilizers, heat stabilizers, antioxidants, antistatic agents, dyeing improvers, antibacterial agents, flame retardants, ultraviolet absorbers and the like may be blended as modifiers.

  The polylactic acid monofilament of the present invention needs to have a tensile strength of 2.0 cN / dtex or more. This tensile strength can be controlled by the aforementioned draw ratio, first godet roller temperature, second godet roller temperature, and the like. By setting the tensile strength to 2.0 cN / dtex or more, good strength can be obtained when the fabric is made. When the tensile strength is less than 2.0 cN / dtex, a drum-shaped package can be obtained, but the yarn breakage in the next step and insufficient strength when formed into a woven fabric are caused. More preferably, it is 2.8 cN / dtex or more. In addition, the tensile strength here means the tensile strength of the package inner layer part mentioned later.

  Moreover, it is preferable that the tensile strength ratio of the polylactic acid monofilaments in the package inner layer portion and the outer layer portion is 0.9 or more. The tensile strength of the inner layer portion of the package is the value of the tensile strength of the monofilament within 100 m from the beginning of package winding. The tensile strength of the package outer layer portion is an average value obtained by measuring the tensile strength of monofilaments at a point of 20 mm in the winding thickness direction from the beginning of winding of the package, each point at intervals of 20 mm from the package outer layer, and a point of the outermost layer. When it is less than 0.9, the inner layer portion having a high residual stress has a lower tensile strength than the surface layer portion, and it is difficult to say that the quality is uniform. In addition, the residual stress is likely to cause tight tightening, and the tension when unwinding the yarn from the package is likely to increase, causing tension fluctuations such as thread breakage or sinking when woven. There is a concern about the deterioration of the quality of the fabric. From the viewpoint of uniform quality, the upper limit is preferably 1 or less.

  Furthermore, it is preferable that the tensile strength ratio of the polylactic acid monofilament in the polylactic acid package inner layer portion and the outer layer portion 6 months after the package formation is 0.9 or more. The tensile strength ratio of the polylactic acid monofilament in the polylactic acid package inner layer portion after one month has elapsed from the package formation and the polylactic acid package inner layer portion after six months has elapsed since the package formation is preferably 0.9 or more.

Accordingly, there is an advantage that the mixed use of the product with other lots in the next process and the storage with time are easy, and the handling property is excellent. More preferably, the tensile strength ratio of the polylactic acid monofilament in the inner layer portion and the outer layer portion of the package, the tensile strength ratio of the polylactic acid monofilament in the inner layer portion and the outer layer portion of the polylactic acid package 6 months after the formation of the package, The tensile strength ratio of the polylactic acid monofilament in the inner layer of the lactic acid package and the inner layer of the polylactic acid package 6 months after the formation of the package is 0.95 or more.
Here, the polylactic acid package after the elapse of 6 months refers to a package that has passed 6 months after the package is formed in a general Japanese climate with an air temperature of 0 ° C. to 30 ° C. and a humidity of 40% RH to 80% RH. .

The tensile strength ratio between the inner layer and the outer layer of the package is that the stretching temperature is low, resulting in non-uniform stretching, and high winding tension and stress on the yarn. The occurrence of a crystal structure spot phenomenon in which transparent fibers become white fibers) causes a reduction in strength and a difference in strength ratio. In particular, the devitrification phenomenon occurs during cold drawing or under excessive tension.
Further, the polylactic acid monofilament generates a residual stress in the inner layer portion of the package by increasing the high drawing / winding tension and winding speed. This residual stress causes cold drawing over time, and a devitrification phenomenon (crystal structure spot phenomenon in which white to transparent fibers become white fibers) progresses, causing a decrease in strength over time. To provide a drum-shaped package in which yarn breakage frequently occurs in warping and weaving, which is the next process, and high-order passability failure is likely to occur, and strong elongation does not decrease over time due to a decrease in strength and elongation. In addition, it is practically effective to manufacture a drum-shaped package, and by reducing the winding speed and stretching tension, it is possible to improve the decrease in strength and elongation over time.

  The lightness of the polylactic acid monofilament of the present invention is preferably 62 or less. It is a white to transparent monofilament with a brightness of 62 or less, and when it exceeds 62, it becomes a white monofilament. This is due to the devitrification phenomenon of the fibers (crystal structure spot phenomenon where white to transparent fibers become white fibers). Or cause a decrease in textile quality. The lower limit is not particularly specified, but more preferably the brightness is 60 or less.

  Moreover, it is preferable that the fineness is 5 to 50 dtex, and the spinning stability is improved by setting it to 5 dtex or more, and it is possible to produce with good operation, and the yarn dropping is suppressed by setting it to 50 dtex or less. More preferably, the fineness is 15 to 40 dtex. The elongation is preferably 25 to 70%, and the operation is stabilized in the next step by setting the elongation to 25% or more and 70% or less. More preferably, the elongation is 30 to 60%. A boiling water shrinkage of 20.0% or less is preferable for practical use, and stable quality and operability are obtained in the next step. More preferably, the boiling water shrinkage is 15% or less. Such fineness, strength, elongation, and boiling water shrinkage can be adjusted by a generally known method.

  Further, the yarn cross-sectional shape may be a round cross-section, a Y-shaped cross-section, a T-shaped cross-section, a flat cross-section, or a shape obtained by further deforming them.

Hereinafter, the present invention will be described more specifically with reference to examples. In addition, the physical-property value in an Example was measured by the method described below. Melt spinning was performed using the spinning device shown in FIG.

(1) Winding tension (cN / dtex)
Using a TENSION METER and an FT-R pickup sensor manufactured by Toray Engineering Co., Ltd., the value (cN) measured between the second godet rollers 7 and 7 'shown in FIG. 2 and the winding device 8 was measured and divided by the fineness. Value.

(2) Stretch tension (cN / dtex)
Using the TENSION METER and FT-R pickup sensor manufactured by Toray Engineering Co., Ltd., the value (cN) measured between the first godet roller 6, 6 ′ to the second godet roller 7, 7 ′ shown in FIG. It was taken as a value that was divided.

(3) Winding diameter: A (mm)
The length of the winding diameter A in the drum-shaped package winding thickness direction was measured.

(4) Winding width: D (mm)
The length of the winding width D in the drum-shaped package winding width direction was measured.

(5) Saddle: BC (mm)
The difference between the length of the end winding diameter B in the package winding thickness direction and the length of the minimum winding diameter C in the package winding thickness direction.

(6) Thread drop: S (pieces)
The outer diameter of the winding diameter A portion in the drum-shaped package thickness direction is inspected at a point where the brightness of illumination is 250 lux or more and 1250 lux or less, and from the position of 10 mm from the innermost layer to the outermost layer in the thickness direction of the package end surface. The number S of thread droppings having a length of 10 mm or more occurring on the package end face was measured. In addition, the thing straddling the position of 10 mm from the innermost layer is not counted.

(7) Fineness (dtex)
Measured according to JIS L1013 (2010) 8.3.1 Positive Fineness (Method A). The official moisture content was 0%.

(8) Boiling water shrinkage rate Measured according to JIS L1013 8.18.1 (a) skein dimensional change rate (Method A).

(9) Tensile strength (cN / dtex)
JIS L1013 (2010) 8. 5 Measured according to tensile strength and elongation. In addition, it was set as 500 mm of holding | grip intervals and the tension speed of 500 mm / min. The average value of repeated measurements was used. Further, the tensile strength of the inner layer portion of the package is a value of tensile strength measured by sampling from a monofilament within 100 m from the start of winding of the package. The measured tensile strength of the inner layer portion of the package was taken as the tensile strength of the monofilament. The tensile strength of the package outer layer portion is an average value obtained by sampling a monofilament at a position 20 mm from the innermost layer in the winding thickness direction, at a position 20 mm apart from the package outer layer, and at the outermost layer point and measuring the tensile strength. .

Each tensile strength ratio of the polylactic acid monofilament of the polylactic acid monofilament package was calculated as follows.
A. Tensile strength ratio of polylactic acid monofilament between inner layer and outer layer immediately after package formation = (tensile strength of inner filament monofilament / tensile strength of outer filament monofilament)
B. Tensile strength ratio of polylactic acid monofilament in the inner layer portion and outer layer portion of the polylactic acid monofilament package after six months after the package formation = (tensile strength of the monofilament inner layer portion of the package after six months / tensile tension of the outer monolayer portion of the package after six months) Strength)
C. After forming the package, the tensile strength ratio of the polylactic acid monofilament in the inner layer of the polylactic acid monofilament package after 6 months and the inner layer of the polylactic acid monofilament package after one month after the package formation = (of the inner layer monofilament of the package after 6 months) Tensile strength / Tensile strength of monofilament inside the package after 1 month)
(10) Lightness (L value)
Using a polylactic acid monofilament sampled from the position of the outermost layer of the package and winding a thread on a black plate with a density of 3 g / cm ³ , use Suga Test Instruments Co., Ltd. SM Color Computer Model SM-T, Value) Measurement was carried out.

(11) Cutting yarn breakage The number of yarn breakage per 10,000 m during aging and weaving was counted. Less than once was evaluated in three stages, ◎, 1-2 times ○, and 3 times or more.

(12) Textile quality The appearance was inspected at a point where the brightness of illumination was 250 lux or more and 1250 lux or less, and the band-like gloss difference in the live machine was observed. A state in which there is no nicks, B in which scents are slightly seen (weak level), B (slight levels, halfway between B and D) in C, and stigma appearing intermittently (medium level) ) And D, and a state (strong level) in which strong nicks are seen intermittently was determined in E and 5 stages.

(13) Weight average molecular weight Using a gel permeation chromatography 2690 manufactured by Waters, polystyrene was used as a standard.

(14) Polylactic acid polymer (P1)
Lactide produced from L-lactic acid having an optical purity of 99.5% was polymerized at 180 ° C. for 180 minutes in a nitrogen atmosphere in the presence of bis (2-ethylhexanoate) tin catalyst (lactide to catalyst molar ratio = 10000: 1). To obtain a polylactic acid polymer P1.

[Examples 1 to 5, Comparative Examples 1 and 2]
Polylactic acid polymer P1 having a weight average molecular weight of 200,000 is melted at 220 ° C., and the yarn is discharged from a spinneret in which four circular discharge holes having a diameter of 0.6 mm in the diameter of the base are arranged in a circle, and cooled from one direction of a total length of 1500 mm. After the yarn is cooled by a cooling device that generates wind, a spinning oil mainly composed of mineral oil is applied by an oiling device using an oiling roller method, and wound around the first godet roller heated to 100 ° C. (actual measurement value) 3.5 times. The second godet roller heated to 100 ° C. (actual measured value) was subjected to heat treatment 4.5 times and stretched 3.5 times between the first godet roller and the second godet roller, and then the cam traverse type winding device Winding at a winding speed of 2500 m / min and winding tensions of 0.18 cN / dtex (Example 1), 0.14 cN / dtex (Example 2), 0.10 cN / dtex ( Example 3), 0.08 cN / dtex (Example 4), 0.04 cN / dtex (Example 5), 0.30 cN / dtex (Comparative Example 1), 0.03 cN / dtex (Comparative Example 2), A drum package of 28 dtex polylactic acid monofilament was obtained.

  Table 1 shows the form of the obtained drum-shaped package and the physical properties of the monofilament.

  In addition, about the obtained drum-shaped package package, the number of thread drop of the drum-shaped package where the thread drop was the most was counted.

  In the drum-shaped package of Example 1, the number of thread droppings of the package that lost the most yarns was 1 (0.020 / mm). There was no thread drop. In Example 2 as well, the number of thread drops of the package that lost most yarns was 1 (0.020 pieces / mm), 2 of 8 packages were 1 thread drop, and 6 packages were 0. It was a piece. As for the packages in Example 3, all the 8 packages had 0 thread drop (0.000 pieces / mm). In all of the packages in Example 4, the number of thread droppings was 0 (0.000 / mm). Also in Example 5, all the 8 packages had 0 thread droppings (0.000 pieces / mm). Thus, all the packages obtained in the examples were in good package form. On the other hand, in Comparative Example 1, the number of yarn droppings of the package that lost the most yarns was 3 (0.060 pieces / mm), 1 out of 8 packages was 3 pieces, and 7 packages were 2 pieces (0 .040 pieces / mm), and many thread drops occurred.

  In Examples 1 to 3 and Comparative Example 1, a drum-like package having a winding diameter of 60 mm was obtained with no spun yarn breakage in the operability evaluation using 100 kg of raw material. In the same operability evaluation, in Examples 4 and 5, the winding tension was slightly lower than in Examples 1 to 3, and the yarn breakage occurred once, and a drum package having a winding diameter of 40 mm and a winding diameter of 30 mm was obtained. . Comparative Example 2 was obtained by reducing the winding tension. However, since the winding tension was low, spun yarns frequently occurred, and only a winding diameter of 15 mm could be obtained, resulting in low production efficiency.

  The obtained drum-shaped packages of Examples 1 to 5 and Comparative Example 1 were used for woven wefts, and weaving evaluation was performed for one counterweight with an air jet loom. The results are shown in Table 1.

  Examples 1 to 5 were good results with respect to yarn breakage and fabric quality. In particular, Examples 3 and 4 had better results with no yarn breakage and good fabric quality. In Comparative Example 1, the yarn was caught on the end surface of the package when the yarn was unwound, and the yarn breakage occurred five times. In addition, sink unevenness due to fluctuations in tension due to yarn dropping and saddles occurred, and the quality of the fabric was a reject level D.

[Examples 6 to 7, Comparative Examples 3 and 4]
Polylactic acid polymer P1 having a weight average molecular weight of 200,000 is melted at 220 ° C., and the yarn is discharged from a spinneret in which four circular discharge holes having a diameter of 0.6 mm in the diameter of the base are arranged in a circle, and cooled from one direction of a total length of 1500 mm. The yarn is cooled by a cooling device that emits wind, and a spinning oil mainly composed of mineral oil is applied by an oiling device using an oiling roller system. The first and second godet rollers are set to 40 ° C. (Comparative Example 3), 50 ° C. (Example) 6) Heated to 150 ° C. (Example 7), 170 ° C. (Comparative Example 4) (both measured values), wound 3.5 times on the first godet roller, and then wound 4.5 times on the second godet roller After performing heat treatment and stretching 3.5 times between the first godet roller and the second godet roller, it is wound at a winding speed of 2500 m / min by a cam traverse type winding device, and the winding tension is 0.10 cN / d. And ex, to give a drum-like package of polylactic acid monofilament 28 dtex.

  Table 2 shows the form of the obtained drum package and the physical properties of the monofilament. A comparison is made with Example 3 in which the first and second godet roller temperatures were 100 ° C.

  In addition, about the obtained drum-like package 8 packages, the number of yarn drop of the drum-like package where the yarn drop was the most was counted.

  The drum-shaped package of Example 3 had 0 yarn dropouts (0.000 pieces / mm) in all 8 packages. In Example 6, the number of thread drops of the package in which the most yarns were dropped was 1 (0.020 / mm), 1 of 8 packages was 0 thread drop, and 7 packages were 1 thread drop. there were. In Example 7, the number of thread droppings was 0 (0.000 / mm) in all 8 packages. In Comparative Example 3, all the 8 packages had 0 thread drop (0.000 pieces / mm). These packages were good package forms.

  In Examples 3 and 6, a drum-shaped package with a winding diameter of 60 mm was obtained with no spun yarn breakage in the operability evaluation using 100 kg of raw material. In the same operability evaluation, in Example 7, a yarn breakage occurred once due to high yarn temperature and unstable winding behavior, and a drum-shaped package with a winding diameter of 30 mm was obtained. In Comparative Example 4, the yarn was fused to the godet roller, spun yarn breakage occurred frequently, and only a winding diameter of 15 mm could be obtained, resulting in low production efficiency. Further, in Comparative Example 3, the stress at the time of drawing increased due to the low yarn temperature at the time of drawing, resulting in non-uniform drawing, devitrification occurred, and the L value was 65 and the tensile strength was 1.5 cN / dtex. .

  The obtained drum-shaped packages of Examples 3, 6, and 7 and Comparative Example 3 were used for woven wefts, and weaving evaluation was carried out for one reciprocation with an air jet loom. The results are shown in Table 2.

  Examples 3, 6, and 7 had good results with respect to yarn breakage and fabric quality. In particular, Example 3 had better results with no yarn breakage and good fabric quality. In Comparative Example 3, the tensile strength was as low as 1.5 cN / dtex, and yarn breakage occurred 10 times. Further, the quality of the fabric was not only Yokohike, but the fibers themselves were white, and the color of the entire fabric, yokomura, etc. were also generated, and it was at the reject level E.

[Examples 8 and 9]
Except for adjusting the discharge amount of the molten polylactic acid polymer P1 and setting the draw ratio to 2.5 (Example 8) and 4.5 (Example 9), the same as in Example 3 (draw ratio 3.5) Melt spinning was carried out to obtain a drum package of 28 dtex polylactic acid monofilament.

Table 3 shows the form of the obtained drum-shaped package and the physical properties of the monofilament.
In addition, about the obtained drum-like package 8 packages, the number of yarn drop of the drum-like package where the yarn drop was the most was counted.

  The drum-shaped package of Example 8 had 0 pieces of yarn dropping in all 8 packages (0.000 pieces / mm). In Example 9, the number of thread drop was 1 (0.020 pieces / mm), and 4 packages out of 8 packages had 0 thread drop and 4 packages had 1 thread drop.

  In Examples 8 and 9, a drum-shaped package having a winding diameter of 60 mm was obtained with no spun yarn breakage in operability evaluation using 100 kg of raw material.

  The obtained drum-shaped packages of Examples 8 and 9 were used for woven wefts, and weaving evaluation was carried out for one counterweight with an air jet loom. The results are shown in Table 3.

  In Example 8, the tensile strength was 2.0 cN / dtex, and the yarn breakage occurred twice. In addition, the quality of the fabric was acceptable level C, but the tear strength when made into a fabric was slightly lower than that of Example 9. In Example 9, thread breakage occurred once. As for the woven fabric, slight slight sink marks due to fluctuations in tension caused by saddles were observed, but the woven fabric grade was an acceptable level B.

[Examples 10 to 12]
Example 3 except that the discharge amount of the molten polylactic acid polymer P1 was adjusted, and the winding speed was 1500 m / min (Example 10), 3000 m / min (Example 11), and 4500 m / min (Example 12). Melt spinning was carried out in the same manner as (winding speed 2500 m / min) to obtain a drum package of 28 dtex polylactic acid monofilament.

Table 3 shows the form of the obtained drum-shaped package and the physical properties of the monofilament.
In addition, about the obtained drum-like package 8 packages, the number of yarn drop of the drum-like package where the yarn drop was the most was counted.

  The drum-shaped package of Example 10 had zero thread dropout (0.000 / mm) in all eight packages. In Example 11 as well, all eight packages had zero thread dropout (0.000 pieces / mm). In Example 12, the number of thread drops of the package with the most thread drop is 1 (0.025 / mm), 5 out of 8 packages have 1 thread drop, and 3 packages have 0 thread drop. It was a good package form.

  In Examples 10 and 11, a drum-like package having a winding diameter of 60 mm was obtained with no spun yarn breakage in operability evaluation using 100 kg of raw material. In the same operability evaluation, in Example 12, spinning yarn breakage caused by a high winding speed occurred once, and a drum-shaped package having a winding diameter of 50 mm was obtained.

  The obtained drum-shaped packages of Examples 10 to 12 were used for woven fabric wefts, and weaving evaluation was carried out for one counter portion with an air jet loom.

  In Example 11, good results were obtained with respect to yarn breakage and fabric quality. In Example 10, the tensile strength was slightly low as 2.5 cN / dtex, and one yarn breakage occurred. Further, although the quality of the fabric was an acceptable level B, the tear strength when the fabric was used was slightly low. In Example 12, thread breakage occurred twice. Regarding the woven fabric, slight sink marks due to tension fluctuations due to saddles were observed, but the woven fabric grade was an acceptable level C.

[Examples 13 and 14]
Except for adjusting the discharge amount of the molten polylactic acid polymer P1 and setting the fineness to 10 dtex (Example 13) and 45 dtex (Example 14), melt spinning is performed in the same manner as in Example 3 (Fineness 28 dtex), A drum-shaped package of polylactic acid monofilament was obtained.

  Table 3 shows the form of the obtained drum-shaped package and the physical properties of the monofilament.

  In addition, about the obtained drum-like package 8 packages, the number of yarn drop of the drum-like package where the yarn drop was the most was counted.

  The drum-shaped package of Example 13 had 0 pieces (0.000 pieces / mm) of thread dropping in all 8 packages. The number of thread drops of the package in which the number of thread drops was the largest in Example 14 was 1 (0.020 / mm), 4 out of 8 packages were 1 thread drop, and 4 packages were 0 thread drop. It was a good package form.

  In Example 14, a drum-shaped package having a winding diameter of 60 mm was obtained with no spun yarn in the operability evaluation using 100 kg of raw material. In the same operability evaluation, in Example 13, a yarn breakage caused by the fineness occurred once, and a drum-shaped package having a winding diameter of 50 mm was obtained.

  The obtained drum-shaped packages of Examples 13 and 14 were used for woven fabric wefts, and weaving evaluation was carried out for one counterweight with an air jet loom.

  In Example 13, good results were obtained with respect to yarn breakage and fabric quality. In Example 14, thread breakage occurred once. Regarding the woven fabric, a slight slight sink mark was observed, but the woven fabric grade was an acceptable level B.

[Examples 15 and 16]
Bis (2-ethylhexanoate) Example 3 (200,000), except that the amount of tin catalyst was adjusted to a polylactic acid polymer having a weight average molecular weight of 150,000 (Example 15) and 350,000 (Example 16). ) Was melt-spun and a 28 dtex polylactic acid monofilament drum-shaped package was obtained.

  Table 3 shows the form of the obtained drum-shaped package and the physical properties of the monofilament.

  In addition, about the obtained drum-like package 8 packages, the number of yarn drop of the drum-like package where the yarn drop was the most was counted.

  The drum-shaped package of Example 15 had 0 pieces (0.000 pieces / mm) of thread dropping in all 8 packages. The number of thread drops of the package in which the number of thread drops in Example 16 was 1 (0.020 / mm), 6 of 8 packages were 1 thread drop, and 2 packages were 0 thread drop. It was a good package form.

  Further, in Example 16, a drum-shaped package having a winding diameter of 60 mm was obtained with no spun yarn in the operability evaluation using 100 kg of raw material. In the same operability evaluation, in Example 15, a spun yarn breakage occurred once, and a drum-shaped package with a winding diameter of 50 mm was obtained.

  The obtained drum-shaped packages of Examples 15 and 16 were used for woven fabric wefts, and weaving evaluation was carried out for one counterweight with an air jet loom.

  In Example 15, thread breakage occurred once. Regarding the woven fabric, a slight slight sink mark was observed, but the woven fabric grade was an acceptable level B. In Example 16, thread breakage occurred three times. As for the fabric, slight sink marks were observed, but the fabric quality was acceptable level C.

[Examples 17 to 21, Comparative Examples 5 and 6]
Polylactic acid polymer P1 having a weight average molecular weight of 200,000 is melted at 220 ° C., and the yarn is discharged from a spinneret in which four circular discharge holes having a diameter of 0.6 mm in the diameter of the base are arranged in a circle, and cooled from one direction of a total length of 1500 mm. After the yarn is cooled by a cooling device that generates wind, a spinning oil mainly composed of mineral oil is applied by an oiling device using an oiling roller method, and wound around the first godet roller heated to 100 ° C. (actual measurement value) 3.5 times. The second godet roller heated to 100 ° C. (actual measured value) is subjected to a heat treatment 4.5 times and stretched at a stretching tension of 0.20 cN / dtex between the first godet roller and the second godet roller, and then the cam traverse system is wound. Winding with an apparatus at a winding width of 50 mm and a winding speed of 2500 m / min, the winding tension was 0.18 cN / dtex (Example 17), 0.14 cN / dte (Example 18), 0.10 cN / dtex (Example 19), 0.07 cN / dtex (Example 20), 0.05 cN / dtex (Example 21), 0.30 cN / dtex (Comparative Example 5), A drum-shaped package of 28 dtex polylactic acid monofilament was obtained at 0.03 cN / dtex (Comparative Example 6).

  Table 4 shows the form of the obtained drum-shaped package and the physical properties of the monofilament.

  In addition, about the obtained drum-shaped package package, the number of thread drop of the drum-shaped package where the thread drop was the most was counted.

  In the drum-shaped package of Example 17, the number of thread drops of the package that lost the most yarn was 1 (0.025 pieces / mm), and 4 out of 8 packages caused 1 thread drop. There was no thread drop. Also in Example 18, the number of thread drops of the package with the most thread drop was 1 (0.025 / mm), 1 out of 8 packages was 1 thread drop, and 7 packages had 0 thread drop 0 It was a piece. As for the package in Example 19, all the 8 packages had 0 thread drop (0.000 pieces / mm). In all of the packages in Example 20, the number of thread drops was 0 (0.000 pieces / mm). In Example 21 as well, all eight packages had 0 thread drops (0.000 pieces / mm). Thus, all the packages obtained in the examples were in good package form. On the other hand, in Comparative Example 5, the number of yarn droppings of the package that lost most yarn was 3 (0.075 / mm), 1 out of 8 packages was 3 yarn droppings, and 7 packages were 2 (0 .050 pieces / mm), and many thread drops occurred.

  Also, since Examples 19 to 21 were wound at an appropriate winding tension, the strength ratio of the package inner layer / outer layer, the strength ratio of the inner layer / outer layer after six months, the strength ratio of the inner layer after six months / one month elapsed However, since Examples 17 and 18 and Comparative Example 5 were wound with a high winding tension, they were slightly lower than Examples 19 to 21, and 0.97, 0.99, respectively. A 0.95 drum package was obtained.

  In Examples 17 to 19 and Comparative Example 5, a drum-like package with a winding diameter of 50 mm was obtained with no spun yarn breakage in operability evaluation using 100 kg of raw material. In the same operability evaluation, in Examples 20 and 21, the winding tension was slightly lower than those in Examples 17 to 19, and the spinning yarn breakage occurred once, and a drum package having a winding diameter of 35 mm and a winding diameter of 30 mm was obtained. . In Comparative Example 6, the winding tension was reduced. However, since the winding tension was low, spun yarns frequently occurred, and only a winding diameter of 10 mm could be obtained, resulting in low production efficiency.

  The obtained drum-shaped packages of Examples 17 to 21 and Comparative Example 5 were used for woven fabric wefts, and weaving evaluation was carried out for one counterweight with an air jet loom. The results are shown in Table 1.

  Examples 17 to 21 had good results with respect to yarn breakage and fabric quality. In particular, Examples 19 and 20 had better results with no yarn breakage and good fabric quality. In Comparative Example 5, the yarn was caught on the end surface of the package when the yarn was unwound, and the yarn breakage occurred five times. In addition, sink unevenness due to fluctuations in tension due to yarn dropping and saddles occurred, and the quality of the fabric was a reject level D.

[Examples 22 and 23, Comparative Example 7]
Polylactic acid polymer P1 having a weight average molecular weight of 200,000 is melted at 220 ° C., and the yarn is discharged from a spinneret in which four circular discharge holes having a diameter of 0.6 mm in the diameter of the base are arranged in a circle, and cooled from one direction of a total length of 1500 mm. After the yarn is cooled by a cooling device that generates wind, a spinning oil mainly composed of mineral oil is applied by an oiling device using an oiling roller method, and wound around the first godet roller heated to 100 ° C. (actual measurement value) 3.5 times. The second godet roller heated to 100 ° C. (actual measured value) was subjected to heat treatment 4.5 times, and the stretching tension between the first godet roller and the second godet roller was 0.30 cN / dtex (Example 22), 0.35 cN / After stretching at dtex (Example 23) and 0.40 cN / dtex (Comparative Example 7), the winding width is 50 mm and the winding speed is 250 with a cam traverse type winding device. Winding at m / min, the winding tension and 0.18cN / dtex, to give a drum-like package of polylactic acid monofilament 28 dtex.

  Table 5 shows the form of the obtained drum package and the physical properties of the monofilament. Compare with Example 17, which was conducted at a stretching tension of 0.20 cN / dtex.

  In addition, about the obtained drum-shaped package package, the number of thread drop of the drum-shaped package where the thread drop was the most was counted.

  The number of thread droppings of the packages in which the number of thread droppings in the drum-shaped packages of Examples 17, 22, 23, and Comparative Example 7 was the largest was 1 (0.025 / mm), and 1 in 4 out of 8 packages. Thread drop occurred, and 4 packages had 0 thread drop. All of the packages thus obtained were in good package form.

  In Examples 17, 22, and 23, the winding tension was high, the package inner layer / outer layer strength ratio was 0.97, 0.95, and 0.94. Drum-shaped packages having an inner layer / outer layer strength ratio and a six-month inner layer / one-month inner layer strength ratio of 0.97, 0.94, and 0.93, respectively, were obtained. In Comparative Example 7, the drawing tension was higher and the devitrification phenomenon occurred, so the brightness exceeded 62, the strength ratio of the inner layer / outer layer after 6 months, and the strength ratio of the inner layer after 6 months / 1 month passed was 0.87. A drum package was obtained.

  In Examples 17, 22, and 23 and Comparative Example 7, a drum-shaped package with a winding diameter of 50 mm was obtained with no spun yarn breakage in operability evaluation using 100 kg of raw material.

  The obtained drum-shaped packages of Examples 17, 22, and 23 and Comparative Example 7 were used for woven wefts, and weaving evaluation for one counterweight was performed with an air jet loom. The results are shown in Table 5.

  Examples 17, 22, and 23 had good results with respect to yarn breakage and fabric quality. However, it has been found that the stability at the time of processing decreases as the strength ratio of the inner layer / outer layer after the lapse of 6 months and the strength ratio of the inner layer of the lapse of 6 months / the inner layer after the lapse of 1 month are lowered. In Comparative Example 7, the fiber itself was white due to the unevenness caused by the tension fluctuation caused by the saddle and the devitrification phenomenon due to the high stretch tension, and the color of the entire woven fabric was poor and the reject level E. Furthermore, since the strength ratio of the inner layer / outer layer after the lapse of 6 months and the strength ratio of the inner layer after the lapse of 6 months / the inner layer after the lapse of 1 month were 0.87, it was very difficult to operate because the number of broken yarns was 6 times. .

[Examples 24 and 25, Comparative Example 8]
Polylactic acid polymer P1 having a weight average molecular weight of 200,000 is melted at 220 ° C., and the yarn is discharged from a spinneret in which four circular discharge holes having a diameter of 0.6 mm in the diameter of the base are arranged in a circle, and cooled from one direction of a total length of 1500 mm. After the yarn is cooled by a cooling device that generates wind, a spinning oil mainly composed of mineral oil is applied by an oiling device using an oiling roller method, and wound around the first godet roller heated to 100 ° C. (actual measurement value) 3.5 times. The second godet roller heated to 100 ° C. (actual measured value) was subjected to heat treatment 4.5 times and stretch tension between the first godet roller and the second godet roller was 0.10 cN / dtex (Example 24), 0.05 cN / After stretching at dtex (Example 25) and 0.03 cN / dtex (Comparative Example 8), the winding width is 50 mm and the winding speed is 250 with a cam traverse type winding device. Winding at m / min, the winding tension and 0.05 cN / dtex, to give a drum-like package of polylactic acid monofilament 28 dtex.

  Table 6 shows the form of the obtained drum package and the physical properties of the monofilament. A comparison is made with Example 21 where the stretching tension is 0.20 cN / dtex.

  In addition, about the obtained drum-shaped package package, the number of thread drop of the drum-shaped package where the thread drop was the most was counted.

  In the drum-shaped packages of Examples 21, 24, and 25 and Comparative Example 8, the number of thread droppings of the package that lost the most yarn was 0 (0.000 pieces / mm), and 8 packages had 0 thread droppings. . All of the packages thus obtained were in good package form.

  In Examples 21, 24 and 25 and Comparative Example 8, since the stretching tension, the winding speed were appropriate, and the winding tension was low, the strength ratio of the package inner layer / outer layer, the strength ratio of the inner layer / outer layer after 6 months, 6 months A drum-shaped package was obtained in which no difference was found in the strength ratio of the inner layer during the course / one month after the passage.

  Further, in Examples 21 and 24, the operability evaluation using 100 kg of raw material was slightly low in drawing tension, and one piece of spun yarn occurred, and the winding diameter was 30 mm. In Example 25, operability using 100 kg of raw material was achieved. In the evaluation, the drawing tension was slightly low, and spun yarn breakage occurred twice, and a drum-shaped package having a winding diameter of 25 mm was obtained. In Comparative Example 8, the drawing tension was further reduced, but since the drawing tension was low, the drawn yarn was frequently broken, and only a winding diameter of 5 mm could be obtained, resulting in low production efficiency.

  The obtained drum-shaped packages of Examples 21, 24, and 25 were used for woven wefts, and weaving evaluation was carried out for one counterweight with an air jet loom. The results are shown in Table 6.

  In Examples 21, 24, and 25, good results were obtained with respect to yarn breakage and fabric quality.

[Examples 26 and 27, Comparative Example 9]
Polylactic acid polymer P1 having a weight average molecular weight of 200,000 is melted at 220 ° C., and the yarn is discharged from a spinneret in which four circular discharge holes having a diameter of 0.6 mm in the diameter of the base are arranged in a circle, and cooled from one direction of a total length of 1500 mm. The yarn is cooled by a cooling device from which wind is generated, and a spinning oil mainly composed of mineral oil is applied by an oiling device using an oiling roller method. The first and second godet rollers are set to 50 ° C. (Example 26), 150 ° C. (Example) 27), heated to 170 ° C. (Comparative Example 9) (both measured values), wound around the first godet roller 3.5 times, then subjected to heat treatment 4.5 times around the second godet roller and the first godet roller After stretching at a stretching tension of 0.35 cN / dtex between the second godet rollers, winding with a cam traverse type winding device at a winding width of 50 mm and a winding speed of 2500 m / min, winding A tension 0.18cN / dtex, to give a drum-like package of polylactic acid monofilament 28 dtex.

  Table 7 shows the form of the obtained drum-shaped package and the physical properties of the monofilament. Comparison is made with Example 23 in which the first and second godet roller temperatures were 100 ° C.

  In addition, about the obtained drum-like package 8 packages, the number of yarn drop of the drum-like package where the yarn drop was the most was counted.

  In the drum-shaped package of Example 27, the number of thread droppings of the package that lost the most yarn was 0 (0.000 pieces / mm), and that of the 8 package was 0. In the drum-shaped packages of Examples 23 and 26, the number of thread droppings of the package with the most yarn dropping is 1 (0.025 / mm), and 4 packages out of 8 packages have 0 thread dropping 4 packages Was one thread drop. These packages were good package forms.

  In Examples 23 and 27 and Comparative Example 9, since the stretching and winding tension is high, the strength ratio of the package inner layer / outer layer is 0.94, the strength ratio of the inner layer / outer layer after 6 months, the inner layer after 6 months / month A drum-shaped package having a strength ratio of the inner layer of 0.93 was obtained. In Example 23 where the temperature of the first and second godet rollers was low, the stress at the time of drawing increased due to the low yarn temperature at the time of drawing, resulting in non-uniform drawing. Therefore, the strength ratio of the package inner layer / outer layer was 0.92. It was. A drum-shaped package was obtained in which the strength ratio of the inner layer / outer layer after the lapse of 6 months and the strength ratio of the inner layer after the lapse of 6 months / the inner layer of 1 month decreased to 0.91.

  In Examples 23 and 26, a drum-shaped package with a winding diameter of 50 mm was obtained with no spun yarn breakage in the operability evaluation using 100 kg of raw material. In the same operability evaluation, in Example 27, a spun yarn breakage occurred once due to high yarn temperature and unstable winding behavior, and a drum-shaped package having a winding diameter of 25 mm was obtained. In Comparative Example 9, the yarn was fused to the godet roller, spun yarn breakage occurred frequently, and only a winding diameter of 5 mm could be obtained, resulting in low production efficiency.

  The obtained drum-shaped packages of Examples 23, 26, and 27 were used for woven wefts, and weaving evaluation was performed for one counterweight with an air jet loom. The results are shown in Table 2.

  Since Examples 23, 26, and 27 have high stretching and winding tensions, there is a difference in strength between the package inner layer and the outer layer, so that the processing yarn breakage occurs. Is one thread breakage. Regarding the fabric quality, Examples 23 and 27 had high stretch tension, so that the lightness was increased and the color of the fabric became white. Therefore, the fabric quality was acceptable level B. Further, in Example 26 where the yarn temperature was lower, the lightness was higher and the color of the fabric became white, so that the fabric quality was a pass level C.

[Examples 28 and 29, Comparative Example 10]
Polylactic acid polymer P1 having a weight average molecular weight of 200,000 is melted at 220 ° C., and the yarn is discharged from a spinneret in which four circular discharge holes having a diameter of 0.6 mm in the diameter of the base are arranged in a circle, and cooled from one direction of a total length of 1500 mm. After the yarn is cooled by a cooling device that emits wind, a spinning oil mainly composed of mineral oil is applied by an oiling device using an oiling roller method, and wound around a first godet roller heated to 50 ° C. (actual measurement value) 3.5 times. The second godet roller heated to 50 ° C. (actual value) is subjected to heat treatment 4.5 times and stretched at a stretching tension of 0.35 cN / dtex between the first godet roller and the second godet roller. Winding device with winding width 50 mm, winding speed 1500 m / min (Example 28), 4500 m / min (Example 29), 5500 m / min (Comparative Example 10) In the winding, the winding tension and 0.18cN / dtex, to give a drum-like package of polylactic acid monofilament 28 dtex.

  Table 8 shows the form of the obtained drum package and the physical properties of the monofilament. Compare with Example 26 performed at a winding speed of 2500 m / min.

  In addition, about the obtained drum-shaped package package, the number of thread drop of the drum-shaped package where the thread drop was the most was counted.

  In the drum-shaped package of Example 28, the number of thread droppings of the package that lost the most yarns was 1 (0.025 / mm), and 3 out of 8 packages caused 1 thread dropping, and 5 packages. There was no thread drop. In the drum-shaped package of Example 26, the number of thread droppings of the package that lost the most yarn was 1 (0.025 / mm), and 4 out of 8 packages caused 1 thread dropping. There was no thread drop. In the drum-shaped package of Example 29, the number of thread droppings of the package that lost the most yarns was 1 (0.025 / mm), and 1 thread dropping occurred in 7 out of 8 packages. There was no thread drop. All of the packages thus obtained were in good package form. On the other hand, in Comparative Example 10, the number of yarn droppings of the package that lost the most yarns was 3 (0.075 pieces / mm), 1 out of 8 packages was 3 pieces, and 7 packages were 2 pieces (0 .050 pieces / mm), and many thread drops occurred.

  In Examples 26, 28, and 29, since the winding tension is high and the first and second godet rollers are low, a drum-shaped package having a strength ratio of the inner layer / outer layer of 0.92, 0.93, and 0.92 is used. Obtained. Further, in Comparative Example 10 having a high winding speed, a drum-shaped package having an inner layer / outer layer strength ratio of 0.89 was obtained.

  Further, in Examples 26 and 28, since the winding was performed with a high stretching tension, a drum having an inner layer / outer layer strength ratio of 6 months elapsed and an inner layer strength ratio of 6 months elapsed / inner layer of 0.91 and 0.92 A shaped package was obtained. Furthermore, in Example 29 where the winding speed was high, a drum-shaped package was obtained in which the strength ratio of the inner layer / outer layer after 6 months and the strength ratio of the inner layer after 6 months / 1 month passed was 0.90. On the other hand, in Comparative Example 10, since the drawing and winding tension is high and the winding speed is high, the devitrification phenomenon proceeds and the brightness becomes 62.5. The strength ratio of the inner layer / outer layer after six months, the inner layer after six months / one month A drum-like package having a strength difference of 0.87 in the progress inner layer and a large physical property difference between the inner and outer layers was obtained.

  In Examples 26, 28, and 29 and Comparative Example 10, a drum-shaped package with a winding diameter of 50 mm was obtained with no spun yarn breakage in the operability evaluation using 100 kg of raw material.

  The obtained drum-shaped packages of Examples 26, 28, and 29 and Comparative Example 10 were used for woven wefts, and weaving evaluation was performed for one counterweight with an air jet loom. The results are shown in Table 8.

  Examples 26, 28, and 29 have high stretching and winding tension, and have a strength ratio of an inner layer / outer layer of 6 months, an inner layer of 6 months, and an inner layer of 6 months. Since the brightness was high, the textile quality was a result of an acceptance level C. On the other hand, in Comparative Example 10, whitening of the fiber itself occurs due to the devitrification phenomenon due to the high stretching tension, the color of the entire woven fabric is poor, and the unevenness due to the tension fluctuation due to the saddle occurs, which is rejected. Level E. Furthermore, since the strength ratio of the package inner layer portion to the outer layer portion is 0.89, the strength ratio of the inner layer / outer layer after the lapse of 6 months, and the strength ratio of the inner layer of the lapse of 6 months / the inner layer of the lapse of one month is 0.87. The operation was very difficult, 10 times, and it was difficult to operate.

[Examples 30 and 31, Comparative Example 11]
Polylactic acid polymer P1 having a weight average molecular weight of 200,000 is melted at 220 ° C., and the yarn is discharged from a spinneret in which four circular discharge holes having a diameter of 0.6 mm in the diameter of the base are arranged in a circle, and cooled from one direction of a total length of 1500 mm. The yarn is cooled by a cooling device that generates wind, and a spinning oil mainly composed of mineral oil is applied by an oiling device using an oiling roller system. The first and second godet rollers are set to 40 ° C. (Comparative Example 11), 50 ° C. (Example) 30), 150 ° C. (Example 31) (both measured values), wound around the first godet roller 3.5 times, and then subjected to heat treatment 4.5 times around the second godet roller and the first godet roller After stretching at a stretching tension of 0.05 cN / dtex between the second godet rollers, winding with a cam traverse type winding device at a winding width of 50 mm and a winding speed of 2500 m / min, winding A tension 0.05 cN / dtex, to give a drum-like package of polylactic acid monofilament 28 dtex.

  Table 9 shows the form of the obtained drum package and the physical properties of the monofilament. A comparison is made with Example 25 where the first and second godet roller temperatures were 100 ° C.

  In addition, about the obtained drum-like package 8 packages, the number of yarn drop of the drum-like package where the yarn drop was the most was counted.

  In the drum-shaped packages of Examples 25, 30, 31, and Comparative Example 11, the number of thread droppings of the package that lost most yarns was 0 (0.000 pieces / mm), and 8 out of 8 packages were 0. It was a thread drop. These packages were good package forms.

  In Examples 25 and 31, since the stretching and winding tensions are low and the first and second godet roller temperatures are appropriate, the strength ratio of the package inner layer / outer layer, the strength ratio of the inner layer / outer layer after 6 months, and the inner layer after passage of 6 months / A drum-shaped package with no difference in the strength ratio of the inner layer after 1 month was obtained.

  Further, in Example 30 and Comparative Example 11, since the stress at the time of stretching increased due to the low temperature of the first and second godet rollers, and non-uniform stretching, the strength ratio of the package inner layer / outer layer, the inner layer / outer layer after 6 months The drum-shaped package in which the strength ratio of the inner layer after 6 months / the inner layer after passage of 1 month was reduced to 0.98, 0.94 was obtained.

  In Examples 25 and 30 and Comparative Example 11, in the operability evaluation using 100 kg of raw material, stretching and spinning breakage caused by low winding tension occurred once, and a drum having a winding diameter of 25 mm A shaped package was obtained. In the same operability evaluation, in Example 31, where the yarn temperature was high, the drawn yarn breakage occurred once more, so that a drum-shaped package having a winding diameter of 20 mm was obtained.

  The obtained drum-shaped packages of Examples 25, 30, and 31 and Comparative Example 11 were used for woven fabric wefts, and weaving evaluation was carried out for one counterweight with an air jet loom. The results are shown in Table 9.

  In Examples 25 and 31, good results were obtained with respect to yarn breakage and fabric quality. Example 30 was good in terms of fabric quality, but thread breakage caused by low tensile strength occurred twice. On the other hand, in Comparative Example 11, the strength ratio of the inner layer / outer layer of the package, the strength ratio of the inner layer / outer layer after 6 months, and the strength ratio of the inner layer after 6 months / 1 month passed were 0.94, but the tensile strength was low. The processing yarn breakage occurred 5 times, and the operation was not successful. Further, the devitrification phenomenon due to the non-uniform stretching due to the low yarn temperature caused the lightness to be as bad as 62.5, the fiber itself was white, the color of the entire woven fabric was poor, and the reject level E.

[Examples 32 and 33]
Except for adjusting the discharge amount of the molten polylactic acid polymer P1 and setting the fineness to 10 dtex (Example 32) and 45 dtex (Example 33), melt spinning is performed in the same manner as in Example 19 (Fineness 28 dtex), A drum-shaped package of polylactic acid monofilament was obtained.

Table 10 shows the form of the obtained drum package and the physical properties of the monofilament.
In addition, about the obtained drum-like package 8 packages, the number of yarn drop of the drum-like package where the yarn drop was the most was counted.

  In the drum-shaped package of Example 32, all the 8 packages had 0 thread drop (0.000 pieces / mm). In Example 33, the number of thread droppings of the package that lost most yarn was 1 (0.025 / mm), 7 out of 8 packages were 1 thread dropping, and 1 package was 0 thread dropping. It was a good package form.

  In Examples 32 and 33, since winding was performed at an appropriate stretching tension and winding speed, the strength ratio of the package inner layer / outer layer, the strength ratio of the inner layer / outer layer after six months, the inner layer after six months / one month elapsed There was no difference in the intensity ratio.

  In Examples 32 and 33, a drum-like package having a winding diameter of 50 mm was obtained with no spun yarn breakage in the operability evaluation using 100 kg of raw material.

  The obtained drum-shaped packages of Examples 32 and 33 were used for woven fabric wefts, and weaving evaluation was carried out for one counterweight with an air jet loom.

  In Example 32, thread breakage due to the fineness occurred twice, but the fabric quality was good. In Example 33, the yarn breakage caused by the thread dropping occurred once, and the fabric quality was saddle due to the high saddle. The fabric quality was acceptable level C.

[Examples 34 and 35]
Bis (2-ethylhexanoate) Example 19 (200,000), except that the amount of tin catalyst was adjusted to a polylactic acid polymer having a weight average molecular weight of 150,000 (Example 34) and 350,000 (Example 35). ) Was melt-spun and a 28 dtex polylactic acid monofilament drum-shaped package was obtained.

  Table 10 shows the form of the obtained drum package and the physical properties of the monofilament.

  In addition, about the obtained drum-like package 8 packages, the number of yarn drop of the drum-like package where the yarn drop was the most was counted.

  The drum-shaped packages of Examples 34 and 35 all had a good package form with 0 pieces (0.000 pieces / mm) of thread dropping in all 8 packages.

  Further, in Example 35, since winding was performed at an appropriate stretching tension and winding speed, the strength ratio of the inner layer / outer layer of the package, the strength ratio of the inner layer / outer layer after 6 months, and the strength of the inner layer after 6 months / one month elapsed There was no difference in the ratio. In Example 34, since the weight average molecular weight was low, it was easy to crystallize. Conversely, since it was greatly affected by small stretching tension, winding tension, and winding speed, the strength ratio of the package inner layer / outer layer, the strength of the inner layer / outer layer after 6 months. Ratio, the strength ratio of the inner layer after 6 months / the inner layer after 1 month was as low as 0.95, and a drum package was obtained.

  In Examples 34 and 35, a drum-shaped package with a winding diameter of 50 mm was obtained with no spun yarn breakage in the operability evaluation using 100 kg of raw material.

  The obtained drum-shaped packages of Examples 34 and 35 were used for woven wefts, and weaving evaluation was carried out for one counter-weight with an air jet loom.

  In Example 34, one piece of thread breakage due to the low weight average molecular weight and the low strength and strength ratio occurred, but the fabric quality was good. In Example 35, there was no yarn breakage, but the increase in the orientation degree at the time of stretching due to an increase in the weight average molecular weight caused an increase in brightness, and the fabric color became white. became.

[Examples 36 and 37]
Except that the winding width was 90 mm (Example 36) and the winding width was 120 mm (Example 37) using a cam traverse type winding device, melt spinning was performed in the same manner as in Example 19 (200,000), and 28 decitex poly A drum-shaped package of lactic acid monofilament was obtained.

  Table 10 shows the form of the obtained drum package and the physical properties of the monofilament.

  In addition, about the obtained drum-shaped package package, the number of thread drop of the drum-shaped package where the thread drop was the most was counted.

  In the drum-shaped packages of Examples 36 and 37, the number of thread droppings of the package that lost most yarn was 0 (0.000 pieces / mm), and all 8 packages had 0 thread droppings. All were good package forms.

  In Examples 36 and 37, only the winding width is changed. Therefore, the strength ratio of the package inner layer / outer layer, the strength ratio of the inner layer / outer layer after 6 months, and the strength of the inner layer after passage of 6 months / inner layer as of Example 19 A drum package with no difference in the ratio was obtained.

  In Examples 36 and 37, a drum-like package having a winding diameter of 30 mm and a winding diameter of 20 mm was obtained with no spinning yarn breakage in the operability evaluation using 100 kg of raw material.

  The obtained drum-shaped packages of Examples 36 and 37 were used for woven fabric wefts, and weaving evaluation was carried out for one counterweight with an air jet loom. The results are shown in Table 10.

  In Example 36, good results were obtained with respect to yarn breakage and fabric quality. Example 37 also has no yarn breakage, but minute sink marks are generated due to tension fluctuations due to the yarn hitting the end face during unwinding due to the winding width becoming as large as 120 mm. became.

A: Winding diameter in the package winding thickness direction (mm)
B: End winding diameter in the package winding thickness direction (mm)
C: Minimum winding diameter in the package winding thickness direction (mm)
D: Winding width in the package winding width direction (mm)
E: Yarn drop measurement area 1: Spin block 2: Spinneret 3: Cooling device 4: Spinning duct 5: Oil supply device 6, 6 ': First godet roller 7, 7': Second godet roller F: Spinning yarn 8: Winding device

Claims (6)

In a drum-shaped package comprising 50% by weight or more of lactic acid monomer and a polylactic acid monofilament having a tensile strength of 2.0 cN / dtex or more, the tensile strength ratio of the polylactic acid monofilament in the inner layer portion and the outer layer portion is 0.9 or more The winding diameter A (mm) in the package winding thickness direction and the number S (pieces) of thread drop having a length of 10 mm or more on the package end face are in the relationship of the following formulas (I) and (II). Drum package of polylactic acid monofilament.
A ≧ 20 (I)
S / (A-10) ≦ 0.025 (II) 1 Symbol placement polylactic acid monofilament drum-shaped package according to claim, wherein the lightness of the polylactic acid monofilament is 62 or less. 3. The polylactic acid monofilament drum-like package according to claim 1 or 2, wherein the tensile strength ratio of the polylactic acid monofilament between the inner layer portion and the outer layer portion of the polylactic acid package 6 months after the package formation is 0.9 or more. Claim tensile strength ratio of the polylactic acid monofilament of the polylactic acid package inner part of the polylactic acid package inner part of the package formed after one month has elapsed and the package formed after 6 months has elapsed, characterized in that at least 0.9 1-3 A drum-shaped package of polylactic acid monofilament according to any of the above. The polylactic acid monofilament composed of 50% by weight or more of melt-discharged lactic acid monomer is cooled, heated and stretched at 50 to 150 ° C., the winding speed is 1500 to 5000 m / min, and the winding tension is 0.04 cN / dtex. The method for producing a drum package of a polylactic acid monofilament according to claim 1, wherein winding is performed at a rate of ˜0.20 cN / dtex. Extending stretching force 0.04cN / dtex~0.35cN / method for manufacturing a drum-shaped package of the polylactic acid monofilament according to claim 5, wherein the winding in dtex.

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