JPWO2019208352A1 - Drum-shaped package made of polylactic acid-based monofilament - Google Patents

Abstract

In a drum-shaped package made of a polylactic acid-based monofilament in which 50% by weight or more is composed of a lactic acid monomer, individual values of end face hardness measured at 36 points at 10 ° intervals at a portion having a package winding thickness of 25 mm are in the range of 35 to 70. A drum-shaped package made of polylactic acid-based monofilament. Provided is a drum-shaped package made of polylactic acid-based monofilament, which is excellent in the quality of gauze fabric and high-order passability during weaving, and has good high-speed unwinding.

Description

The present invention relates to a drum-shaped package made of a polylactic acid-based monofilament. More specifically, the present invention relates to a drum-shaped package made of polylactic acid-based monofilament, which can obtain excellent quality of gauze fabric, has excellent high-order passability during warping and weaving, and can cope with high weaving speed.

While environmental issues such as prevention of global warming, preservation of fossil resources, and reduction of waste are being taken up, biodegradable polymers using biomass are attracting attention, and polylactic acid polymers are particularly attracting attention as the biodegradable polymers. Has been done. Polylactic acid polymer is a polymer made from lactic acid obtained by fermenting starch extracted from plants, and has a good balance of transparency, mechanical properties, heat resistance, and cost among biodegradable polymers using biomass. The best. Generally, a method for producing a polylactic acid monofilament is a two-step method in which an undrawn yarn is wound once and then drawn (Patent Document 1), or a one-step method in which a polymer is melted and then directly drawn and wound (Patent Document 1). 2. There is Patent Document 3), but the one-step method is superior to the two-step method in terms of the production cost of the polylactic acid monofilament. Patent Document 2 proposes a package in which the end face of the polylactic acid monofilament package has no thread drop, and has a draw tension of 0.04 cN / dtex to 0.35 cN / dtex and a take-up tension of 0.04 cN / dtex to 0. A manufacturing method controlled to 20 cN / dtex has been proposed. Further, Patent Document 3 proposes a package for the purpose of improving the unresolvability of the innermost layer portion of the polylactic acid monofilament package by suppressing the dry heat shrinkage stress on the end face of the polylactic acid monofilament package and suppressing the dry heat shrinkage stress of the innermost layer portion of the package. There is.

Japanese Unexamined Patent Publication No. 2001-131826 Japanese Unexamined Patent Publication No. 2013-322223 International Publication No. 2016/194578

However, in recent years, the weaving speed has been increased for the purpose of improving the production efficiency in the weaving process, and there is a strong demand for a polylactic acid-based monofilament package having good high-speed unwinding property.

The drum-shaped package of polylactic acid monofilament described in Patent Document 3 suppresses fluctuations in unwinding tension when the monofilament is unwound from the package during warping and weaving, and also causes dry heat shrinkage of the innermost layer of the package. Although stress can be suppressed and the unraveling property of the innermost layer can be improved, the phenomenon that the unwinding of the yarn in a ring shape when the yarn is unraveled from the package due to the increase in weaving speed, So-called loop loss occurs, and if the loop drop is severe, the loom stops and the higher passability deteriorates, and if the loop drop is mild, the weaving is performed without the loom stop, so there is a problem that the quality of the braided fabric deteriorates. It was. Similarly, in the drum-shaped package of polylactic acid monofilament described in Patent Document 2, there is a problem that ring loss is likely to occur as the weaving speed is increased, and the high-order passability and the quality of the gauze fabric are deteriorated.

The present invention overcomes the above-mentioned problems of the prior art, and provides a drum-shaped package made of a polylactic acid-based monofilament which can obtain excellent quality of gauze fabric, has excellent high-order passability during weaving, and has good high-speed unwinding. The purpose is to provide.

The present invention adopts the following configuration in order to achieve the above problems. That is,
(1) In a drum-shaped package made of a polylactic acid-based monofilament in which 50% by weight or more is composed of a lactic acid monomer, individual values of end face hardness measured at 36 points at 10 ° intervals at a portion having a package winding thickness of 25 mm are 35 to 70. A drum-shaped package made of polylactic acid-based monofilaments, which is characterized by being in the range.
(2) The polylactic acid-based monofilament according to (1), wherein the CV value (coefficient of variation,%) of the end face hardness measured at 36 points at 10 ° intervals at a portion having a package winding thickness of 25 mm is 15% or less. It is a drum-shaped package consisting of.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a polylactic acid-based monofilament drum-like package in which excellent quality of gauze fabric is obtained, high-order passability during weaving is excellent, and high-speed unwinding property is excellent.

It is a front schematic view of the polylactic acid-based monofilament drum-shaped package of this invention. It is a schematic diagram of an example of a spinning apparatus for manufacturing the polylactic acid-based monofilament drum-shaped package of the present invention. It is a front schematic diagram for demonstrating the method of hardness measurement carried out in this invention. It is a side schematic for explaining the method of hardness measurement carried out in this invention.

The polylactic acid-based polymer used in the present invention is a polymer having − (O-CHCH _3- CO) − as a repeating unit, and refers to a polymer obtained by polymerizing an oligomer of lactic acid such as lactic acid or lactide. Since there are two types of optical isomers of D-lactic acid and L-lactic acid in lactic acid, the polymers of the polymer are poly (D-lactic acid) consisting of only D-form and poly (L-lactic acid) consisting of only L-form. There is a polylactic acid polymer consisting of both. The optical purity of D-lactic acid or L-lactic acid in the polylactic acid polymer decreases, the crystallinity decreases, and the melting point decrease increases. Therefore, the optical purity is preferably 90% or more in order to increase the heat resistance. However, apart from the system in which the 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 of 140 ° C. or higher. A stereo complex in which racemic crystals are formed is more preferable because the melting point can be dramatically increased.

In the present invention, the polylactic acid-based monofilament needs to have a ratio of lactic acid monomers constituting the polymer of 50% by weight or more from the viewpoint of preserving fossil resources and biorecycling. The lactic acid monomer constituting the polymer is preferably 75% by weight or more, more preferably 95% by weight or more. Further, as long as the properties of polylactic acid within this range are not impaired, components other than lactic acid may be copolymerized.

In the drum-shaped package of the present invention, it is necessary that the individual values of the end face hardness (hereinafter referred to as the package end face hardness) measured at 36 points at 10 ° intervals at the parts having a package winding thickness of 25 mm are in the range of 35 to 70. .. The package end face hardness referred to here is the hardness (JIS K7312: 1996 compliant) when an Asker rubber hardness tester C-type push needle is pressed against a portion having a package winding thickness of 25 mm. Next, the measurement positions are measured at 36 points while shifting the measurement positions at intervals of 10 ° in the package peripheral length direction, and the hardness is read for each. By setting the hardness of the end face of the package in the range of 35 to 70, it is possible to suppress ring pull-out defects even in high-speed unwinding, and excellent quality of gauze fabric can be obtained, resulting in a package having excellent high-order passability. When the package hardness is less than 35, the end face yarn of the portion is dropped due to friction with the unwinding yarn at the time of high-speed unwinding, and a ring-shaped unwound defect occurs and the quality of the gauze fabric tends to deteriorate. It is in. When the hardness of the end face of the package exceeds 70, the bulge of the end face of the package (hereinafter referred to as bulge) becomes large, so that the high-speed unwinding property tends to deteriorate. The package end face hardness is preferably 50 to 65.

In the drum-shaped package of the present invention, it is preferable that the CV value (%) of the package end face hardness measured at 36 points at 10 ° intervals at a portion having a package winding thickness of 25 mm is 15% or less. By setting the CV value (%) of the package end surface hardness to 15% or less, it is possible to suppress the yarn layer collapse due to the influence of the residual stress of the polylactic acid-based monofilament remaining in the wound package. Further, since it is possible to suppress the collapse of the yarn layer due to the vibration generated when the spindle is decelerated, the ring does not come off during high-speed unwinding, and the high-order passability and the quality of the gauze fabric are good. More preferably, the CV value (%) of the package end face hardness is 10% or less.

As a method of controlling the package end surface hardness and the CV value (%) of the package end surface hardness within such a range, a series of winding conditions of winding tension, surface pressure, traverse swing width, and deceleration speed for decelerating the winding spindle are integrated. It is possible by combining as.

First, the take-up tension needs to be 0.10 cN / dtex or less. By setting the take-up tension to 0.10 cN / dtex or less, the residual stress can be reduced and the bulge can be suppressed. If the winding tension exceeds 0.10 cN / dtex, the bulge becomes large due to the influence of the residual stress, and the hardness of the package end face of the bulge portion decreases. Further, since the hardness of the end face of the package is increased as a whole, the hardness of the end face of the package is likely to vary. If the take-up tension is less than 0.04 cN / dtex, the yarn will reversely wind around the Gode roll and the yarn will break, so the winding tension is preferably 0.05 to 0.08 cN / dtex.

Secondly, the load (hereinafter referred to as surface pressure) with respect to the line length in which the roller bail (12 in FIG. 2) is in contact with the package (3 in FIG. 2) needs to be 125 N / m or less. By setting the surface pressure to 125 N / m or less, the package can be formed while suppressing the collapse of the yarn layer. In addition, since residual stress can be reduced, variations in package end face hardness can be suppressed. If the surface pressure exceeds 125 N / m, the yarn layer collapses easily, and the package end surface hardness of the portion where the yarn layer collapses decreases, so that the package end surface hardness tends to vary. If the surface pressure is less than 50 N / m, the hardness of the end face of the package becomes too low, so that the yarn layer collapses easily, and the hardness of the end face of the package at the portion where the yarn layer collapses further decreases, so that the hardness of the end face of the package varies. It will be easier. It is preferably 80 to 120 N / m.

Thirdly, it is preferable that the traverse swing width of the traverse device (11 in FIG. 2) is in the range of 3 to 5%. By setting the traverse swing width to 3 to 5%, the overlap of the threads forming the package is suppressed, and the vibration of the winding device (15 in FIG. 2) and the polylactic acid-based monofilament package (3 in FIG. 2) are suppressed. ) Can suppress the collapse of the yarn layer due to vibration or the like until the spindle stops after reaching the specified winding amount. The traverse swing period is not particularly limited, but a period of 3 to 4 seconds is preferable. The traverse method is not particularly limited to the 1-axis to 3-axis blade traverse method, the microcam traverse method, and the spindle method that can shorten the free length, but the microcam with good thread gripping property is considered from the stability of package formation. The traverse method is preferable. When the traverse swing width is less than 3%, the yarn layer easily collapses due to the overlap of the threads forming the package, and the package end surface hardness of the portion where the yarn layer collapses decreases, so that the package end surface hardness varies. Is likely to occur. If the traverse swing width exceeds 5%, yarn drops to the end face of the package are likely to occur, so that the quality of the woven fabric becomes inferior due to fluctuations in unwinding tension during warping and weaving.

Fourth, it is preferable that the deceleration speed for decelerating the spindle after the polylactic acid-based monofilament package (3 in FIG. 2) reaches the specified winding amount is 20 to 70 m / sec. By setting the deceleration speed for decelerating the spindle to 20 to 70 m / sec, it is possible to suppress the yarn layer collapse due to vibration or the like that occurs when the spindle is decelerated. If the deceleration speed for decelerating the spindle exceeds 70 m / sec, the yarn layer is likely to collapse due to vibration generated when the spindle is decelerated, and the package end face hardness of the part where the yarn layer has collapsed decreases, so that the package end face hardness varies. Is likely to occur. The slower the speed at which the spindle is decelerated, the more the yarn layer of the package can be suppressed from collapsing, but the time until the spindle stops becomes longer, which deteriorates workability. It is more preferably 20 to 40 m / sec, still more preferably 25 to 30 m / sec.

By combining the elements of the first to fourth winding methods in this way, the hardness of the end face of the package can be suppressed.

Since the package foam affects the unraveling property of the yarn in the next process, a good package foam is required. A schematic diagram of the drum-shaped package of FIG. 1 will be cited and described in detail below. First, as a drawback of package foam other than thread drop, the saddle (ear stand) 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. The smaller the saddle, the better the unwinding property of the thread at high speed. The unwinding speed required in the next process reaches 1000 to 1200 m / min, but if the saddle is high, the saddle portion is continuously scraped by the unraveling threads, so a polylactic acid system with low wear resistance. The surface of the fiber is scraped, resulting in defects that match the package end face period (corresponding to the thread length from one saddle to the other saddle). In addition, since the unwinding tension of the thread is liable to fluctuate in the saddle portion, it becomes an unstable factor in the next process. Therefore, the saddle (BC) is preferably 6 mm or less, more preferably 4 mm or less, still more preferably 2 mm or less in order to suppress end face period defects and perform stable high-speed unwinding in the next step. .. The lower limit is not particularly specified, but ideally it is 0 mm.

Further, there is a bulge (bulge) represented by ((maximum package winding width E-package winding width D) / package winding width D) × 100, and the smaller the bulge, the better the unwinding property of the yarn at high speed. If the bulge is high, the yarn will come into contact with the bulge portion at the time of unwinding, and the yarn layer will easily collapse. Therefore, in order to suppress end face period defects and perform stable high-speed unwinding in the next step, the bulge is preferably 10% or less, more preferably 7% or less, still more preferably 5% or less. The lower limit is not specified, but ideally it is 0%.

The polylactic acid-based monofilament constituting the drum-shaped package of the present invention preferably has a tensile strength of 2.5 cN / dtex or more. By setting the content to 2.5 cN / dtex or more, it is possible to suppress yarn breakage when the polylactic acid-based monofilament is unwound from the package during weaving, and good woven fabric strength can be obtained when the fabric is made into a gauze fabric. .. More preferably, it is 3.5 cN / dtex or more. The higher the strength, the more preferable, but the maximum strength value in the present invention is 4.3 cN / dtex. Further, the strength is stretched by the speed difference between the heated first Gode roll and the heated second Gode roll to obtain a predetermined strength.

The elongation of the polylactic acid-based monofilament constituting the drum-shaped package of the present invention is preferably 35% to 55%. Within such a range, higher-order passability during weaving and higher-order processing stability when made into a tea bag gauze fabric are improved. A more preferable elongation is 35% to 45%. The elongation is stretched by the speed difference between the heated first Gode roll and the heated second Gode roll to obtain a predetermined elongation.

The fineness of the polylactic acid-based monofilament constituting the drum-shaped package of the present invention is preferably 15 dtex to 40 dtex. By setting this range, in the case of a tea bag gauze fabric, the perforated area per unit area can be optimized, the extraction speed becomes optimum for teas, and the tea becomes tasty.

The boiling water shrinkage of the polylactic acid-based monofilament constituting the drum-shaped package of the present invention is preferably 20% or less. By setting it to 20% or less, when it is processed into a tea bag gauze fabric, it is possible to obtain an optimum opening area per unit area even if shrinkage occurs when hot water is poured, which is ideal for teas. The extraction speed is high, and the tea has a good taste. More preferably, it is 17% or less.

Next, an example of the method for producing the polylactic acid monofilament package of the present invention will be described with reference to the process schematic diagram of FIG. FIG. 2 is a process schematic diagram showing an example of a method for producing a polylactic acid monofilament package of the present invention.

The spinning block 4 in the melt spinning machine is heated by a heating means (not shown). The spinneret 5 is attached to the spinneret block 4, the polylactic acid-based polymer is melted, the polymer is discharged from the spinneret 5, the yarn 1 is formed, and cooling provided on the downstream side of the spinneret 5 (not shown). After the yarn 1 is uniformly cooled by the device, an oil agent is applied to the yarn 1 by the refueling device 6, and the yarn 1 is stretched between the first god rolls 7 and 8 and the second god rolls 9 and 10, and then the microcam traverse method is used. While traversing the yarn with the traverse device 11, the yarn is wound by the take-up device 15 to form the package 3. When the package 3 reaches the specified winding amount, the take-up side spindle 13 and the standby side spindle 14 turret, and the yarn is automatically switched to the standby side spindle 14. The package 3 located on the standby side decelerates at a predetermined spindle deceleration speed and stops.

In the present invention, the method for winding a polylactic acid-based monofilament is as follows, by combining the winding conditions of winding tension, surface pressure, traverse swing width, and deceleration speed for decelerating the winding spindle, the package end surface hardness and The CV value (%) of the package end face hardness can be set in an appropriate range.

First, it is preferable to wind the winding tension at 0.04 to 0.10 cN / dtex. This winding tension is controlled by, for example, the speed difference between the first Gode rolls 7 and 8 and the second Gode rolls 9 and 10, or the speed difference between the second Gode rolls 9 and 10 and the winding device 15.

Secondly, it is preferable that the surface pressure applied to the package 3 by the roller bail 12 is 50 to 125 N / m. This surface pressure is set to a predetermined pressure by adjusting the compressed air pressure for setting the surface pressure provided in the winding device 15. For example, when the surface pressure is set to 100 N / m, if the winding width F is 70 mm and the number of windings to the paper tube wound on the winding side spindle 13 is 12 drums, the compressed air pressure for setting the surface pressure is adjusted. , The pressure applied to the spindle 13 by the roller bail 12 is set to 84N.

Thirdly, it is preferable that the traverse swing width of the traverse device 11 is in the range of 3 to 5%. This traverse swing width sets the swing width with respect to the traverse set value. For example, when the traverse swing width is 3%, the traverse set value is 2000 cpm, and the traverse swing cycle is 4 seconds, the traverse speed swings from 1940 to 2060 cpm in a 4-second cycle.

Fourth, it is preferable that the deceleration speed for decelerating the spindle after the polylactic acid-based monofilament package 3 reaches the specified winding amount is 20 to 70 m / sec. This spindle deceleration speed is set as the deceleration speed of the spindle located on the standby side when the take-up side spindle 13 and the standby side spindle 14 turret when the polylactic acid-based monofilament package 3 reaches the specified winding amount. The spindle decelerates and stops at the deceleration speed.

The oiling agent in the method for producing a polylactic acid-based monofilament package of the present invention is applied using a known spinning oil agent and a refueling device. As the spinning oil, any form of commonly used spinning oil can be used, such as a straight oil diluted with mineral oil or an emulsion oil diluted with water. The smoothing agent component and emulsifying component in the spinning oil component include ester-based, mineral oil-based, and ether ester-based smoothing agents, ether-type nonionic surfactants having a polyoxyalkylene group in the molecule, and polyhydric alcohol moieties. Examples thereof include ester-type nonionic surfactants and polyoxyalkylene polyhydric alcohol fatty acid ester-type nonionic surfactants. Examples of the refueling device include an oiling roller system and a refueling guide system. The amount of the oil agent adhered to the fiber is preferably 0.3 to 1.0% by weight, more preferably 0.5 to 0.8% by weight.

In the method for producing a polylactic acid-based monofilament package of the present invention, heat stretching is usually performed using Goderoll, and the heat stretching temperature is in the range of 80 to 120 ° C. The heat stretching is preferably carried out using a heated Gode roll, and the Gode roll temperature is a value actually measured by a contact thermometer.

The god roll includes, for example, a first god roll and a second god roll, and since the god roll improves the followability of the yarn, it is preferable to use a Nelson god roll in which two god rolls are paired. Pickup is done on the first Gode roll and stretching is done between Gode rolls at different speeds. For example, in the case of one-step stretching, it is performed between the first and second Gode rolls. In the case of two-stage stretching, it is performed between the first and second god rolls and between the second and third god rolls. The stretching ratio and the number of stretching steps may be any number, but the stretching ratio is 3.5 to 4.5 times, and one-step stretching is preferable. The temperature of the take-back Gode roll (first Gode roll) is in the range of 80 ° C. to 120 ° C. By setting the first Goderoll temperature to 80 ° C. or higher, uniform stretching without crystal structure unevenness becomes possible, and stable quality can be obtained without devitrification phenomenon or decrease in tensile strength. By setting the first Goderoll temperature to 120 ° C. or lower, yarn breakage due to a decrease in spinning tension can be suppressed, and stable operability can be obtained. More preferably, it is 90 ° C. to 110 ° C. or lower.

The temperature of the stretched god roll (second god roll) is in the range of 100 ° C to 130 ° C. By setting the temperature of the second Goderoll to 100 ° C. or higher, the orientation crystallinity can be increased and the boiling water shrinkage rate of the polylactic acid monofilament can be lowered. By setting the temperature of the second Gode roll to 130 ° C. or lower, yarn breakage can be suppressed due to a decrease in winding tension, and stable operability can be obtained. More preferably, it is 110 ° C to 120 ° C.

The thread cross-sectional shape of the polylactic acid-based monofilament constituting the drum-shaped package of the present invention 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 in more detail with reference to Examples. The physical property values in the examples were measured by the method described below.

(1) Fineness (dtex)
Measurement was performed in accordance with JIS L1013 (2010) 8.3.1 Positive fineness (method A). The official moisture content was 0%.

(2) Package winding thickness (mm)
The thickness A in the package winding thickness direction.

(3) Package end face hardness An Asker rubber hardness tester C-type push needle is pressed against the package end face, and the value is indicated by the pointer (JIS K7312: 1996 compliant). The measurement position was a portion having a package winding thickness of 25 mm, and measurement was performed at 36 locations while shifting the measurement position at 10 ° intervals in the package peripheral length direction.

(4) Package end face hardness CV value (coefficient of variation,%)
The CV value (coefficient of variation) of the values measured at 36 locations while shifting the measurement positions at 10 ° intervals in the package peripheral length direction was calculated at the sites having a package winding thickness of 25 mm (see FIGS. 3 and 4).

(5) Bullge (%)
It was calculated by the following formula.
Package winding width D / (maximum package winding width E-package winding width D) x 100.

(6) Saddle (mm)
It was calculated from the following formula.
(Maximum package diameter B-Minimum package diameter C) / 2.

(7) Thread drop (DM / 100DM)
The number of thread drop drums on both end faces of 100 packages for each package was counted.

(8) Tensile strength (cN / dtex), tensile elongation (%)
Measured according to JIS L1013 (2010) 8.5 tensile strength and elongation. The gripping interval was 500 mm and the tensile speed was 500 mm / min. The average value of three repeated measurements was used.

(9) Boiling water shrinkage rate (%)
The measurement was performed according to JIS L1013 (2010) 8.18.1. The sample is wound 20 times with a measuring machine with a frame circumference of 1.125 m, and after leaving it for 24 hours, the length of the skein is measured and then immersed in boiling water (99 ± 1.0 ° C.) for 30 minutes. The skein length after natural drying was measured, and the boiling water shrinkage rate (%) was calculated from the skein length before and after immersion in boiling water.

(10) Winding tension (cN / dtex)
A value obtained by dividing the value measured between the second Gode rolls 9 and 10 and the take-up device 15 shown in FIG. 2 by the fineness using a TENSION METER manufactured by Toray Engineering Co., Ltd. and an FT-R pickup sensor (cN / dtex). And said.

(11) Number of missing packages (DM / 100DM)
Prepare 100 polylactic acid-based monofilament drum-shaped packages with a winding thickness of 40 mm and a thread weight of 1 kg, and evaluate each by a weaving machine in an air jet room at a speed of 1000 m / min and 1200 m / min (package unwinding speed). This was done, and the number of packages with missing rings was counted.

(12) Textile quality 100 polylactic acid-based monofilament drum-shaped packages with a winding thickness of 40 mm and a yarn weight of 1 kg were prepared, and a horizontal driving evaluation was performed at a speed of 1200 m / min on a loom in an air jet room to evaluate the brightness of the lighting. The appearance was inspected at a point of 250 lux or more and 1250 lux or less, and the band-shaped gloss difference and the defect of ring loss in the loom were observed. A is a state in which there is no band-shaped gloss difference or ring loss defect, B is a state in which a band-shaped gloss difference or ring loss defect is slightly observed, and C is a state in which band-shaped gloss difference or ring loss defect is intermittently observed. , A state in which a large number of band-shaped gloss differences and ring omission defects were intermittently observed was judged as D in 4 stages, and A and B levels were regarded as acceptable.

(13) Weight Average Molecular Weight Using gel permeation chromatography 2690 manufactured by Waters, polystyrene was used as a standard for measurement.

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

[Example 1]
Using the spinning apparatus shown in FIG. 2, the polylactic acid polymer P having a weight average molecular weight of 200,000 is melted at 230 ° C., and the yarn is used in a melt spinning pack to cool the yarn discharged from the spinneret 5 discharge hole, and an oiling roller is used. A straight spinning oil diluted with mineral oil was applied by the refueling device 6 of the method (adhesion amount was 0.8% by weight), and then the first Gode rolls 7 and 8 heated to 100 ° C. and the second Gode rolls heated to 115 ° C. After being routed at 9 and 10, stretched 4.0 times, and heat-treated, it is traversed by a microcam traverse type traverse device 11 with a twill angle of 5.6 °, a traverse swing width of 3%, and a traverse swing cycle of 4 seconds. However, under the manufacturing conditions of a surface pressure of 85 N / m, an RB drive OF rate of 0.1%, a set winding speed (V) of 3000 m / min, and a spindle deceleration speed of 25 m / sec, the winding width is 70 mm, the winding thickness is 40 mm, and the winding amount is 1. A drum-shaped package of 0.0 kg, 25 dtex polylactic acid monofilament was obtained.

The end face hardness of the package was 36 to 65, the CV value of the end face hardness of the package was 10%, and there was no thread breakage or thread drop, and the package foam was good. Using the obtained package, weft driving evaluation was carried out (the warp yarn is a polylactic acid monofilament of 25 dtex). As a result, there was no ring loss at the unwinding speed of 1000 m / min, and only 2 drums were missing at the unwinding speed of 1200 m / min. The level at which it did not occur and the high-speed unsolvability were good. In addition, regarding the quality of the woven fabric that was horizontally driven at a unwinding speed of 1200 m / min, the B level, the passing level, and the quality were good, to the extent that a band-shaped gloss difference and ring loss defects were slightly observed.

[Example 2]
A drum-shaped package of polylactic acid-based monofilament was obtained under the same conditions as in Example 1 except that the traverse swing width was changed to 4%. The package end face hardness was 50 to 65, the package end face hardness CV value was 7%, and there was no thread breakage or thread drop on the package end face, which was good. As a result of horizontal driving evaluation of the obtained package in the same manner as in Example 1, there was no ring loss at any of the unwinding speeds, and high-speed unwinding was good. In addition, the quality of the woven fabric that was horizontally driven at a unwinding speed of 1200 m / min was as good as A level without any band-like gloss difference or ring loss defect. That is, it is a package corresponding to a high weaving speed, excellent in high-speed unwinding property of the package, high-order passability at the time of weaving, and excellent quality of the gauze fabric.

[Example 3]
A drum-shaped package of polylactic acid-based monofilament was obtained under the same conditions as in Example 1 except that the traverse swing width was changed to 5%. The package end face hardness was 45 to 63, the package end face hardness CV value was 7%, and there was no thread breakage or thread drop on the package end face, which was good. As a result of horizontal driving evaluation of the obtained package in the same manner as in Example 1, there was no ring loss at the unwinding speed of 1000 m / min, and only one drum was missing at the unwinding speed of 1200 m / min. The high-speed unleashing property was good. In addition, the quality of the woven fabric that was horizontally driven at a unwinding speed of 1200 m / min was good at the B level to the extent that a band-shaped gloss difference and ring loss defects were slightly observed.

[Example 4]
A drum-shaped package of polylactic acid-based monofilament was obtained under the same conditions as in Example 1 except that the traverse swing width was changed to 4% and the spindle deceleration speed was changed to 50 m / sec. The package end face hardness was 40 to 67, the package end face hardness CV value was 10%, and there was no thread breakage or thread drop on the package end face, which was good. As a result of horizontal driving evaluation of the obtained package in the same manner as in Example 1, there was no ring loss at the unwinding speed of 1000 m / min, and only 2 drums were missing at the unwinding speed of 1200 m / min. The high-speed unleashing property was good. In addition, the quality of the woven fabric that was horizontally driven at a unwinding speed of 1200 m / min was good at the B level to the extent that a band-shaped gloss difference and ring loss defects were slightly observed.

[Example 5]
A drum-shaped package of polylactic acid monofilament was obtained under the same conditions as in Example 1 except that the traverse swing width was changed to 4% and the spindle deceleration speed was changed to 70 m / sec. The package end face hardness was 38 to 65, the package end face hardness CV value was 10%, and there was no thread breakage or thread drop on the package end face, which was good. As a result of horizontal driving evaluation of the obtained package in the same manner as in Example 1, there was no ring loss at the unwinding speed of 1000 m / min, and only 3 drums were missing at the unwinding speed of 1200 m / min, which was a high-speed solution. The swelling was good. In addition, the quality of the woven fabric that was horizontally driven at a unwinding speed of 1200 m / min was good at the B level to the extent that a band-shaped gloss difference and ring loss defects were slightly observed.

[Example 6]
A drum-shaped package of 30 dtex polylactic acid-based monofilament was obtained under the same conditions as in Example 1 except that the traverse swing width was changed by 4% and the amount of polymer discharged from the spinneret 5 discharge hole was changed. The package end face hardness was 50 to 60, the package end face hardness CV value was 7%, and there was no thread breakage or thread drop on the package end face, which was good. As a result of horizontal driving evaluation of the obtained package in the same manner as in Example 1, there was no ring loss at any of the unwinding speeds, and high-speed unwinding was good. In addition, the quality of the woven fabric that was horizontally driven at a unwinding speed of 1200 m / min was as good as A level without any band-like gloss difference or ring loss defect. That is, with the increase in the weaving speed, the high-speed unwinding property of the package was excellent, the high-order passability at the time of weaving, and the excellent quality of the gauze fabric were obtained.

[Example 7]
Same as Example 1 except that the speed difference between the second Gode rolls 9 and 10 and the take-up device 15 was changed to adjust the take-up tension to 0.10 cN / dtex, and the amount of polymer discharged from the spinneret 5 discharge hole was changed. Under the conditions, a drum-shaped package of 30 dtex polylactic acid monofilament was obtained. The package end face hardness was 45 to 70, the package end face hardness CV value was 10%, and there was no thread breakage or thread drop on the package end face, which was good. As a result of horizontal driving evaluation of the obtained package in the same manner as in Example 1, there was no ring loss at the unwinding speed of 1000 m / min, and only 2 drums were missing at the unwinding speed of 1200 m / min, which was a high-speed solution. The swelling was good. In addition, the quality of the woven fabric that was horizontally driven at a unwinding speed of 1200 m / min was good at the B level to the extent that a band-shaped gloss difference and ring loss defects were slightly observed.

[Comparative Example 1]
A drum-shaped package of polylactic acid-based monofilament was obtained under the same conditions as in Example 1 except that the traverse swing width was changed to 2% and the spindle deceleration speed was changed to 50 m / sec. The package end face hardness was 32 to 66, and the package end face hardness CV value was 16%. Although there was no thread drop on the package end face, thread breakage occurred at a portion where the package end face hardness was low. As a result of horizontal driving evaluation of the obtained package in the same manner as in Example 1, 7 drums were generated at an unwinding speed of 1000 m / min and 15 drums were generated at an unwinding speed of 1200 m / min. It was inferior in sex. In addition, the quality of the woven fabric that was horizontally driven at an unwinding speed of 1200 m / min was C level and poor quality to the extent that band-shaped gloss difference and ring loss defects were intermittently observed. That is, it can be seen that the package cannot cope with the increase in weaving speed.

[Comparative Example 2]
A drum-shaped package of polylactic acid-based monofilament was obtained under the same conditions as in Example 1 except that the traverse swing width was changed to 2% and the spindle deceleration speed was changed to 90 m / sec. The package end face hardness was 30 to 64, the package end face hardness CV value was 16%, and although there was no thread drop on the package end face, thread breakage occurred at a portion where the package end face hardness was low. As a result of horizontal driving evaluation of the obtained package in the same manner as in Example 1, 10 drums were generated at an unwinding speed of 1000 m / min and 20 drums were generated at an unwinding speed of 1200 m / min. It was inferior in sex. Further, regarding the quality of the woven fabric that was horizontally driven at a unwinding speed of 1200 m / min, the D level and the quality were poor to the extent that band-shaped gloss differences and ring loss defects were intermittently observed. That is, it can be seen that the package cannot cope with the increase in weaving speed.

[Comparative Example 3]
Except for changing the traverse swing width to 2%, changing the speed difference between the second Gode rolls 9, 10 and the take-up device 15 to adjust the take-up tension to 0.12 cN / dtex, and changing the spindle deceleration speed to 50 m / sec. A drum-shaped package of polylactic acid-based monofilament was obtained under the same conditions as in Example 1. The package end face hardness was 25 to 70, the package end face hardness CV value was 18%, and although there was no thread drop on the package end face, thread breakage occurred at a portion where the package end face hardness was low. As a result of horizontal driving evaluation of the obtained package in the same manner as in Example 1, 10 drums were generated at an unwinding speed of 1000 m / min and 21 drums were generated at an unwinding speed of 1200 m / min. It was inferior in sex. Further, regarding the quality of the woven fabric that was horizontally driven at a unwinding speed of 1200 m / min, the D level and the quality were poor to the extent that band-shaped gloss differences and ring loss defects were intermittently observed. That is, it can be seen that the package cannot cope with the increase in weaving speed.

[Comparative Example 4]
A drum-shaped package of 30 dtex polylactic acid monofilament was obtained under the same conditions as in Example 1 except that the traverse swing width was changed by 8% and the amount of polymer discharged from the spinneret 5 discharge hole was changed. The package end face hardness was 20 to 65, the package end face hardness CV value was 21%, the thread drop of the package end face also occurred 55 drums, and the thread collapse occurred at the portion where the package end face hardness was low. As a result of horizontal driving evaluation of the obtained package in the same manner as in Example 1, 25 drums were generated at an unwinding speed of 1000 m / min and 45 drums were generated at an unwinding speed of 1200 m / min. It was inferior in sex. Further, regarding the quality of the woven fabric that was horizontally driven at a unwinding speed of 1200 m / min, the D level and the quality were poor to the extent that band-shaped gloss differences and ring loss defects were intermittently observed. That is, it can be seen that the package cannot cope with the increase in weaving speed.

[Comparative Example 5]
A drum-shaped package of polylactic acid-based monofilament was obtained under the same conditions as in Example 1 except that the traverse swing width was changed to 4% and the spindle deceleration speed was changed to 100 m / sec. The package end face hardness was 32 to 65, the package end face hardness CV value was 17%, and although there was no thread drop on the package end face, thread breakage occurred at a portion where the package end face hardness was low. As a result of horizontal driving evaluation of the obtained package in the same manner as in Example 1, 4 drums were generated at an unwinding speed of 1000 m / min and 9 drums were generated at an unwinding speed of 1200 m / min. It was inferior in sex. In addition, the quality of the woven fabric that was horizontally driven at an unwinding speed of 1200 m / min was C level and poor quality to the extent that band-shaped gloss difference and ring loss defects were intermittently observed. That is, it can be seen that the package cannot cope with the increase in weaving speed.

[Comparative Example 6]
A drum-shaped package of polylactic acid monofilament was obtained under the same conditions as in Example 1 except that the traverse swing width was changed to 4% and the surface pressure was changed to 150 N / m. The package end face hardness was 22 to 66, the package end face hardness CV value was 20%, thread drop on the package end face also occurred in 2 drums, and thread breakage occurred in a portion where the package end face hardness was low. As a result of horizontal driving evaluation of the obtained package in the same manner as in Example 1, 14 drums were generated at an unwinding speed of 1000 m / min and 21 drums were generated at an unwinding speed of 1200 m / min. It was inferior in sex. Further, regarding the quality of the woven fabric that was horizontally driven at a unwinding speed of 1200 m / min, the D level and the quality were poor to the extent that band-shaped gloss differences and ring loss defects were intermittently observed. That is, it can be seen that the package cannot cope with the increase in weaving speed.

[Comparative Example 7]
Polylactic acid system under the same conditions as in Example 1 except that the traverse swing width was 4%, the speed difference between the second Gode rolls 9 and 10 and the winding device 15 was changed and the winding tension was changed to 0.15 cN / dtex. A monofilament drum package was obtained. The package end face hardness was 21 to 68, the package end face hardness CV value was 20%, thread drop on the package end face also occurred on 3 drums, and thread breakage occurred at a portion where the package end face hardness was low. As a result of horizontal driving evaluation of the obtained package in the same manner as in Example 1, 13 drums were generated at an unwinding speed of 1000 m / min and 21 drums were generated at an unwinding speed of 1200 m / min. It was inferior in sex. Further, regarding the quality of the woven fabric that was horizontally driven at a unwinding speed of 1200 m / min, the D level and the quality were poor to the extent that band-shaped gloss differences and ring loss defects were intermittently observed. That is, it can be seen that the package cannot cope with the increase in weaving speed.

1: Thread 2: Paper tube 3: Polylactic acid-based monofilament package 4: Spinning block 5: Spinning cap 6: Refueling device 7: First Gode roll (U)
8: 1st Gode Roll (L)
9: Second Gode Roll (U)
10: Second Gode Roll (L)
11: Traverse device 12: Roller bail 13: Winding side spindle 14: Standby side spindle 15: Winding device

Claims (2)

In a drum-shaped package made of a polylactic acid-based monofilament in which 50% by weight or more is composed of a lactic acid monomer, individual values of end face hardness measured at 36 points at 10 ° intervals at a portion having a package winding thickness of 25 mm are in the range of 35 to 70. A drum-shaped package made of polylactic acid-based monofilament. The drum made of polylactic acid-based monofilament according to claim 1, wherein the CV value (coefficient of variation,%) of the end face hardness measured at 36 points at 10 ° intervals at a portion having a package winding thickness of 25 mm is 15% or less. Package.

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