CN112041253B - Drum-shaped wound body formed from polylactic acid-based monofilament - Google Patents
Drum-shaped wound body formed from polylactic acid-based monofilament Download PDFInfo
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- CN112041253B CN112041253B CN201980025117.6A CN201980025117A CN112041253B CN 112041253 B CN112041253 B CN 112041253B CN 201980025117 A CN201980025117 A CN 201980025117A CN 112041253 B CN112041253 B CN 112041253B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H55/00—Wound packages of filamentary material
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
- D01F6/62—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyesters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
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Abstract
A drum-shaped wound body formed from a polylactic acid-based monofilament, wherein 50% by weight or more of the polylactic acid-based monofilament is composed of a lactic acid monomer, and each value of the end face hardness measured at 36 at 10 DEG intervals at a portion of the wound body having a thickness of 25mm is in the range of 35 to 70. Provided is a drum-shaped package formed from a polylactic acid-based monofilament, which is excellent in the quality of a woven fabric and high-order passability during weaving, and which is excellent in high-speed unwinding.
Description
Technical Field
The present invention relates to a drum-shaped wound body formed of a polylactic acid-based monofilament. More specifically, the present invention relates to a drum-shaped wound body formed of a polylactic acid-based monofilament, which can provide a high-quality yarn fabric, has excellent high-order passability during warping and weaving, and can cope with an increase in weaving speed.
Background
Background artwhile environmental problems such as prevention of global warming, preservation of fossil resources, reduction of waste, and the like have been generally proposed, biodegradable polymers using biomass have attracted attention, and polylactic acid polymers have attracted particular attention as the biodegradable polymers. Polylactic acid polymers are polymers obtained by fermenting starch extracted from plants to obtain lactic acid as a raw material, and biodegradable polymers using biomass have the most excellent balance among transparency, mechanical properties, heat resistance and cost. Generally, a method for producing a polylactic acid monofilament includes a two-step method in which an undrawn yarn is wound and then drawn (patent document 1); the one-step method (patent documents 2 and 3) in which a polymer is melted and then directly stretched and wound is superior to the two-step method in terms of the production cost of the polylactic acid monofilament. Patent document 2 proposes a production method in which a wound body in which no yarn is dropped on an end face of a polylactic acid monofilament wound body is present, and a drawing tension is controlled to 0.04cN/dtex to 0.35cN/dtex, and a winding tension is controlled to 0.04cN/dtex to 0.20 cN/dtex. Patent document 3 proposes a wound body in which no yarn is dropped on the end face of a polylactic acid monofilament wound body, and in which the dry heat shrinkage stress of the innermost layer of the wound body is suppressed, and the unwinding property of the innermost layer is improved.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2001-131826
Patent document 2: japanese patent laid-open publication No. 2013-32223
Patent document 3: international publication No. 2016/194578
Disclosure of Invention
Problems to be solved by the invention
However, in recent years, the weaving speed has been increased in order to improve the productivity in the weaving step, and there is a strong demand for a polylactic acid-based monofilament wound body having good high-speed unwinding properties.
The drum-shaped wound body of polylactic acid monofilament described in patent document 3 can suppress a variation in unwinding tension when unwinding the monofilament from the wound body and suppress a dry heat shrinkage stress in the innermost layer portion of the wound body to improve the unwinding property in the innermost layer portion at the time of warping and weaving, but as the weaving speed increases, a phenomenon of unwinding the monofilament from the wound body into a ring shape, so-called knocking occurs, and in the case of heavy knocking, the loom stops, the high-order passability deteriorates, and in the case of light knocking, the loom performs weaving without stopping, and there is a problem of deterioration in the quality of a yarn fabric. Similarly, in the drum-shaped wound body of polylactic acid monofilament described in patent document 2, as the weaving speed increases, knocking-over easily occurs, and there is a problem that high-order passability and yarn fabric quality deteriorate.
The present invention has been made to overcome the problems of the prior art described above, and an object of the present invention is to provide a drum-like wound body formed of a polylactic acid-based monofilament, which can provide a high-quality yarn woven fabric, has excellent high-order passability during weaving, and has good high-speed unwinding.
Means for solving the problems
The present invention adopts the following configuration to achieve the above-described object. That is to say that the first and second electrodes,
(1) a drum-shaped wound body formed from a polylactic acid-based monofilament, wherein 50% by weight or more of the polylactic acid-based monofilament is composed of a lactic acid monomer, and each value of the end face hardness measured at 36 at 10 DEG intervals at a portion of the wound body having a thickness of 25mm is in the range of 35 to 70.
(2) The drum-like wound body formed of a polylactic acid-based monofilament according to (1), wherein the CV value (coefficient of variation,%) of the end face hardness measured at 36 at 10 ° intervals at a portion of the wound body having a thickness of 25mm is 15% or less.
Effects of the invention
According to the present invention, a polylactic acid-based monofilament drum-like wound body can be provided which can provide excellent yarn fabric quality, excellent high-order passability during weaving, and good high-speed unwinding properties.
Drawings
FIG. 1 is a schematic front view of a drum-shaped polylactic acid-based monofilament package of the present invention.
FIG. 2 is a schematic diagram of an example of a spinning apparatus for producing a polylactic acid-based monofilament drum-like wound body of the present invention.
Fig. 3 is a schematic front view for explaining a method of measuring hardness in the present invention.
Fig. 4 is a schematic side view for explaining a method of measuring hardness in the present invention.
Detailed Description
The polylactic acid polymer used in the present invention is- (O-CHCH) 3 The polymer having a repeating unit of-CO) -refers to a polymer obtained by polymerizing an oligomer of lactic acid such as lactic acid or lactide (lactide). Since lactic acid includes 2 kinds of optical isomers, i.e., D-lactic acid and L-lactic acid, the polymer thereof includes poly (D-lactic acid) formed only of D, poly (L-lactic acid) formed only of L, and polylactic acid polymers formed of both. As the optical purity of D-lactic acid or L-lactic acid in the polylactic acid polymer decreases and the crystallinity decreases, the decrease in melting point becomes large. Therefore, to improve heat resistanceThe optical purity is preferably 90% or more. However, unlike the system in which 2 kinds of optical isomers are simply mixed as described above, it is more preferable that the melting point be dramatically increased when the 2 kinds of optical isomers are blended (blend) and formed into a fiber, and then subjected to a high-temperature heat treatment at 140 ℃ or higher to form a stereocomplex (stereocomplex) having a racemic crystal (racemic crystal).
In the present invention, the polylactic acid-based monofilament needs to have a ratio of lactic acid monomer constituting the polymer of 50% by weight or more from the viewpoint of fossil resource conservation and biological cycle preservation. The lactic acid monomer constituting the polymer is preferably 75% by weight or more, more preferably 95% by weight or more. In addition, components other than lactic acid may be copolymerized within a range not impairing the properties of the polylactic acid within this range.
In the drum-shaped wound body of the present invention, each value of the end face hardness (hereinafter referred to as the wound body end face hardness) measured at 36 at intervals of 10 ° at a portion of the wound body having a thickness of 25mm must be in the range of 35 to 70. The hardness of the end face of the wound body referred to herein is the hardness at which a push pin of an Asker rubber hardness tester type C is pressed at a portion of the wound body having a thickness of 25mm (in accordance with JIS K7312: 1996). Then, measurement was performed at 36 while shifting the measurement positions by 10 ° intervals in the circumferential direction of the wound body, and the hardness was read. By setting the hardness of the end face of the package to be in the range of 35 to 70, the knocking-over defect can be suppressed even in high-speed unwinding, and a package having excellent quality of a woven fabric and excellent high-order passability can be obtained. If the package hardness is less than 35, the yarn is broken by friction between the end face yarn and the unwound yarn at that portion during high-speed unwinding, and the yarn is unwound in a ring shape, which causes a defect of loop shedding, and tends to deteriorate the quality of the woven fabric. When the hardness of the end face of the wound body exceeds 70, the swelling (hereinafter referred to as "bulge") of the end face portion of the wound body increases, and therefore, the high-speed unwinding property tends to be deteriorated. The hardness of the end face of the wound body is preferably 50 to 65.
In the drum-shaped wound body of the present invention, the CV value (%) of the hardness of the end face of the wound body measured at 36 at intervals of 10 ℃ at a position where the wound body has a thickness of 25mm is preferably 15% or less. By setting the CV value (%) of the package end face hardness to 15% or less, it is possible to suppress the yarn layer from being broken due to the influence of the residual stress of the polylactic acid-based monofilament remaining in the wound package. Further, since the yarn layer is prevented from being broken by vibration or the like generated when the spindle is decelerated, the yarn is not dropped at high speed and the high-order passing property and the quality of the yarn woven fabric are excellent. The CV value (%) of the end face hardness of the wound body is more preferably 10% or less.
As a method for controlling the CV value (%) of the end face hardness of the wound body and the end face hardness of the wound body within the above range, it can be realized by integrally combining the following winding conditions in a lump: winding tension, surface pressure, yaw amplitude, and deceleration speed for decelerating the winding spindle.
First, the winding tension needs to be 0.10cN/dtex or less. By setting the winding tension to 0.10cN/dtex or less, the residual stress can be reduced and the bulge can be suppressed. When the winding tension is more than 0.10cN/dtex, the projection becomes large due to the influence of the residual stress, and the hardness of the end face of the wound body at the projection part is lowered. Further, since the hardness of the end face of the wound body is increased as a whole, variations in the hardness of the end face of the wound body are likely to occur. When the winding tension is less than 0.04cN/dtex, the yarn is rewound on the godet roll (godet roll) and yarn breakage occurs, so that 0.05 to 0.08cN/dtex is preferable.
Secondly, the load (hereinafter, referred to as the surface pressure) with respect to the linear length of the wound body (3 of fig. 2) with which the roll traction ring (12 of fig. 2) contacts needs to be 125N/m or less. By setting the surface pressure to 125N/m or less, the wound body can be formed while suppressing the yarn layer from being broken. Further, since the residual stress can be reduced, variation in the hardness of the end face of the wound body can be suppressed. When the surface pressure is more than 125N/m, the yarn layer is likely to be broken, and the hardness of the end face of the wound body at the broken portion of the yarn layer is lowered, so that the hardness of the end face of the wound body is likely to vary. When the surface pressure is less than 50N/m, the hardness of the end face of the wound body becomes too low, and therefore, the yarn layer is likely to be broken, and the hardness of the end face of the wound body at the broken portion of the yarn layer is further lowered, and therefore, variation in the hardness of the end face of the wound body is likely to occur. Preferably 80 to 120N/m.
Third, it is preferable that the traverse device (11 in fig. 2) has a yaw range of 3 to 5%. By setting the yaw width to 3 to 5%, it is possible to suppress the overlapping of the filaments forming the wound body, and to suppress the yarn layer from being broken by the vibration of the winding device (15 in fig. 2) or the vibration of the polylactic acid-based monofilament wound body (3 in fig. 2) until the spindle stops after the predetermined winding amount. The traverse oscillation period is not particularly limited, but is preferably 3 seconds to 4 seconds. The traverse system includes a 1-to 3-axis blade traverse system, a micro-cam traverse system, a spindle system capable of shortening the unloaded length (free length), and the like, and is not particularly limited, and a micro-cam traverse system having good yarn gripping properties is preferable in view of stability of the formed package. When the yaw width is less than 3%, the yarn layer is likely to be broken due to the overlapping of the yarns forming the wound body, and the hardness of the wound body end surface at the broken portion of the yarn layer is decreased, so that variation in the hardness of the wound body end surface is likely to occur. If the yaw width is larger than 5%, yarn dropping to the end face portion of the wound body is likely to occur, and therefore, the quality of the woven fabric is deteriorated due to a change in unwinding tension during warping and weaving.
Fourthly, it is preferable that the deceleration speed for decelerating the spindle is 20 to 70m/sec after the polylactic acid based monofilament wound body (3 in fig. 2) reaches a predetermined winding amount. By setting the deceleration speed for decelerating the spindle to 20 to 70m/sec, the yarn layer can be prevented from being broken due to vibration generated during deceleration of the spindle. If the deceleration speed at which the spindle is decelerated is greater than 70m/sec, the yarn layer is likely to be broken by vibration or the like generated during deceleration of the spindle, and the hardness of the end face of the wound body at the broken portion of the yarn layer is likely to be lowered, so that variation in the hardness of the end face of the wound body is likely to occur. The lower the speed of decelerating the spindle, the more the yarn layer of the wound body can be suppressed from being broken, but the longer the time until the spindle stops, the lower the operability. More preferably 20 to 40m/sec, and still more preferably 25 to 30 m/sec.
By combining the elements of the first to fourth winding methods in this way, the end face hardness of the wound body can be suppressed.
Since the package form affects the unwinding property of the yarn in the next step, a good package form is required. The drum-shaped wound body will be described in detail below with reference to the schematic view of fig. 1. First, in the wound body form, as a drawback that is a problem other than yarn breakage, there is a saddle (flange) represented by a difference (B-C) between an end winding diameter B in the wound body thickness direction and the minimum winding diameter C in the wound body thickness direction, and the smaller the saddle, the more excellent the unwinding property of the yarn at high speed. The unwinding speed required in the next step also reaches 1000 to 1200m/min, but if the saddle is high, the saddle portion is continuously rubbed by the unwound yarn, and therefore the surface of the polylactic acid-based fiber having low abrasion resistance is scraped, and there is a disadvantage that the end face period of the package (corresponding to the yarn length from the saddle to the other side) is uniform. In addition, since the unwinding tension of the yarn is likely to change in the saddle portion, it becomes a factor that the next process is unstable. Therefore, in order to suppress the end face period defect and to achieve stable high-speed unwinding in the next step, the saddle (B-C) is preferably 6mm or less, more preferably 4mm or less, and still more preferably 2mm or less. The lower limit is not particularly limited, and is preferably 0 mm.
Further, there is a projection (bump) represented by ((maximum package winding width E-package winding width D)/package winding width D) × 100, and the smaller the projection, the more excellent the unwinding property of the yarn at high speed. If the projection is high, the filament comes into contact with the projection portion during unwinding, and the filament layer is likely to be collapsed. Therefore, in order to suppress the end face period defect and to achieve stable high-speed unwinding in the next step, the projection is preferably 10% or less, more preferably 7% or less, and still more preferably 5% or less. The lower limit is not particularly limited, and is preferably 0%.
The tensile strength of the polylactic acid-based monofilament constituting the drum-like wound body of the present invention is preferably 2.5cN/dtex or more. By setting the ratio to 2.5cN/dtex or more, the breakage of the polylactic acid-based monofilament during unwinding from the wound body can be suppressed during weaving, and a good fabric strength can be obtained when a yarn fabric is produced. More preferably 3.5cN/dtex or more. The strength is preferably higher, but the maximum strength in the present invention is 4.3 cN/dtex. Further, with respect to the strength, the drawing was performed by the speed difference between the heated 1 st godet roller and the heated 2 nd godet roller, thereby obtaining a predetermined strength.
The polylactic acid-based monofilament constituting the drum-like wound body of the present invention preferably has an elongation of 35% to 55%. By setting the range, high-order passability during weaving and high-order processing stability during production of a yarn fabric for tea bags are improved. The elongation is more preferably 35% to 45%. The elongation is a predetermined elongation obtained by drawing with a speed difference between the heated 1 st godet roll and the heated 2 nd godet roll.
The fineness of the polylactic acid-based monofilament constituting the drum-like wound body of the present invention is preferably 15dtex to 40 dtex. By setting the pore size within this range, when a yarn fabric for tea bags is produced, the area of the openings per unit area can be optimized, the extraction rate for tea can be optimized, and tea with good flavor can be obtained.
The shrinkage in boiling water of the polylactic acid-based monofilament constituting the drum-like wound body of the present invention is preferably 20% or less. By setting the content to 20% or less, when the yarn fabric for tea bags is processed, even if shrinkage occurs when hot water is injected, the area of the openings per unit area is optimal, the extraction rate is optimal for tea, and tea with a good flavor is obtained. More preferably 17% or less.
Next, an example of the method for producing a polylactic acid monofilament wound body according to the present invention will be described with reference to the process schematic diagram of fig. 2. FIG. 2 is a schematic process diagram showing an example of the method for producing a wound body of polylactic acid monofilament according to the present invention.
The spinning block 4 in the melt spinning machine is heated by a heating mechanism not shown. The yarn winding device is configured such that a spinning nozzle 5 is attached to the spinning module 4, a polylactic acid-based polymer is melted, the polymer is discharged from the spinning nozzle 5 to form a yarn 1, the yarn 1 is uniformly cooled by a cooling device, not shown, provided on the downstream side of the spinning nozzle 5, a finish is applied to the yarn 1 by an oil supply device 6, the yarn 1 is stretched between 1 st godet rollers 7 and 8 and 2 nd godet rollers 9 and 10, and then the yarn is wound by a winding device 15 while being traversed by a traversing device 11 of a micro-cam traversing method, thereby forming a wound body 3. When the wound body 3 reaches a predetermined amount, the winding-side spindle 13 and the standby-side spindle 14 turn around (turn), and the yarn is automatically switched to the standby-side spindle 14. The wound body 3 located on the standby machine side decelerates at a predetermined spindle deceleration speed and stops.
As will be shown below, the winding method of the polylactic acid-based monofilament according to the present invention can set the CV value (%) of the end face hardness of the wound body and the end face hardness of the wound body to an appropriate range by combining the winding conditions including the winding tension, the surface pressure, the yaw width, and the deceleration speed for decelerating the winding spindle.
First, it is preferable to wind the steel sheet with a winding tension of 0.04 to 0.10 cN/dtex. The winding tension is controlled by, for example, a speed difference between the 1 st godet rollers 7, 8 and the 2 nd godet rollers 9, 10, or a speed difference between the 2 nd godet rollers 9, 10 and the winding device 15.
Second, the surface pressure applied to the wound body 3 by the roller-pulling ring 12 is preferably 50 to 125N/m. The surface pressure is set to a predetermined pressure by adjusting the pressure of the compressed air for surface pressure setting provided in the winding device 15. For example, when the surface pressure is set to 100N/m, the pressure applied to the spindle 13 by the roller tension ring 12 is set to 84N by adjusting the pressure of the compressed air for surface pressure setting under the conditions that the winding width F is 70mm and the number of windings wound on the paper tube of the winding-side spindle 13 is 12 tubes (dram).
Third, the yaw range of the traverse device 11 is preferably set to be in the range of 3 to 5%. The yaw width is set to a swing width with respect to the traverse setting value. For example, when the yaw width is 3%, the traverse setting value is 2000cpm, and the yaw period is 4 seconds, the swing is performed at a traverse speed of 1940 to 2060cpm with a period of 4 seconds.
Fourthly, it is preferable that the deceleration speed for decelerating the spindle is 20 to 70m/sec after the polylactic acid based monofilament wound body 3 reaches the predetermined winding amount. The spindle deceleration speed is a deceleration speed of a spindle positioned on the standby side by rotating the winding-side spindle 13 and the standby-side spindle 14 when the polylactic acid-based monofilament wound body 3 reaches a predetermined winding amount, and the spindle is decelerated at a set deceleration speed and stopped.
The finish application in the method for producing a polylactic acid-based monofilament wound body of the present invention is carried out using a known spinning finish and a known oil supply device. As the spin finish, any form of a commonly used spin finish such as a straight-run finish diluted with mineral oil or an emulsion finish diluted with water can be used. Examples of the smoothing agent component or the emulsifier component in the spin finish component include smoothing agents such as ester, mineral oil, and ether esters, ether-type nonionic surfactants having a polyoxyalkylene group in the molecule, partial ester-type nonionic surfactants of polyhydric alcohols, and fatty acid ester-type nonionic surfactants of polyoxyalkylene polyols. The oil supply device may be of a oiling roller type or an oil supply guide type. The amount of the finish oil to be 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 wound body of the present invention, the heat-drawing is usually carried out using a godet roll, and the heat-drawing temperature is in the range of 80 to 120 ℃. The heated drawing is preferably carried out by using a heated godet roll, and the godet roll temperature is a value measured by a contact thermometer.
The godet rollers include, for example, a 1 st godet roller and a 2 nd godet roller, and it is preferable to use a Nelson (Nelson) godet roller in which 2 godet rollers are paired in order to improve the following property of the yarn. The drawing was carried out with the 1 st godet, and the drawing was carried out between godets at different speeds. For example, in the case of the 1-stage drawing, the drawing is performed between the 1 st and 2 nd godet rolls. In the case of 2-stage drawing, the drawing is performed between the 1 st and 2 nd godet rolls, between the 2 nd and 3 rd godet rolls, and the like. The stretching ratio and the number of stretching steps may be any, and the preferable stretching ratio is 3.5 to 4.5 times and the preferable stretching step is 1. The temperature of the drawing godet (1 st godet) was in the range of 80 ℃ to 120 ℃. By setting the temperature of the 1 st godet roll to 80 ℃ or higher, uniform drawing can be achieved without causing unevenness in crystal structure, and stable quality can be obtained without devitrification or reduction in tensile strength. By setting the temperature of the 1 st godet roller to 120 ℃ or lower, yarn breakage due to a drop in spinning tension can be suppressed, and stable operability can be obtained. More preferably 90 to 110 ℃.
The temperature of the drawing godet (godet 2) was in the range of 100 ℃ to 130 ℃. By setting the temperature of the 2 nd godet to 100 ℃ or higher, the boiling water shrinkage of the polylactic acid monofilament can be reduced by improving the oriented crystallinity. By setting the temperature of the 2 nd godet roller to 130 ℃ or lower, yarn breakage due to a decrease in winding tension can be suppressed, and stable operability can be obtained. More preferably 110 ℃ to 120 ℃.
The cross-sectional shape of the polylactic acid-based monofilament constituting the drum-like wound body of the present invention may be a circular cross-section, a Y-shaped cross-section, a T-shaped cross-section, a flat cross-section, or a shape obtained by further deforming these.
Examples
The present invention will be described more specifically with reference to examples. The physical property values in the examples were measured by the following methods.
(1) Fineness (dtex)
The titer was measured in accordance with JIS L1013(2010)8.3.1 cm (method A). The public water content was set to 0%.
(2) Thickness (mm) of wound body
The thickness of the wound body is the thickness A in the thickness direction of the wound body.
(3) Hardness of end face of wound body
The hardness of the end surface of the wound body is a value indicated by a push pin of an Asker rubber hardness tester type C pressed against the end surface of the wound body (in accordance with JIS K7312: 1996). The measurement position was measured at 36 points at a site of 25mm in thickness of the wound body while shifting the measurement position by 10 ° intervals in the circumferential direction of the wound body.
(4) CV value (coefficient of variation,%) of end face hardness of wound body
At a portion of the wound body having a thickness of 25mm (see FIGS. 3 and 4), measurement was performed at 36 with the measurement positions shifted by 10 ° in the circumferential direction of the wound body, and the CV value (coefficient of variation) of the measured value was calculated.
(5) Protrusion (%)
Calculated according to the following formula.
The wound body winding width D/(wound body maximum winding width E-wound body winding width D). times.100.
(6) Saddle (mm)
Calculated according to the following formula.
(maximum wound body diameter B-minimum wound body diameter C)/2.
(7) Broken filament (DM/100DM)
The number of dropped bobbins at both end surfaces of each of the 100 wound bodies was calculated.
(8) Tensile Strength (cN/dtex), tensile elongation (%)
Tensile strength and elongation were measured in accordance with JIS L1013(2010) 8.5. The interval between the clamps was 500mm, and the drawing speed was 500 mm/min. The average of 3 replicates was used.
(9) Boiling Water shrinkage (%)
Measured according to JIS L1013(2010) 8.18.1. The sample was produced into a skein with 20 turns of winding using a length measuring instrument having a frame circumference of 1.125m, the skein length after leaving for 24 hours was measured, 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 (%) was calculated from the skein lengths before and after immersion in boiling water.
(10) Winding tension (cN/dtex)
The winding TENSION was determined by measuring the value (cN/dtex) obtained by dividing the measured value by the fineness between the godets 9 and 10 of the 2 nd godet roll shown in fig. 2 and the winding device 15 using a TENSION METER and an FT-R pickup sensor manufactured by Toray Engineering.
(11) Number of knocking-over roll (DM/100DM)
100 polylactic acid-based monofilament drum-like wound bodies having a winding thickness of 40mm and a yarn weight of 1kg were prepared, and beating evaluation was performed by an air jet loom at speeds of 1000m/min and 1200m/min (unwinding speed of the wound bodies), respectively, to calculate the number of wound bodies in which knocking-out occurred.
(12) Quality of fabric
100 drum-shaped packages of a polylactic acid-based monofilament having a winding thickness of 40mm and a yarn weight of 1kg were prepared, and evaluation of beating-up was performed at a speed of 1200m/min by an air jet loom, and appearance was examined at a position where the brightness of illumination was 250 lux or more and 1250 lux or less, and a difference in band-like gloss and a defect of knocking over in the raw fabric were observed. The determination was made in 4 ranks: a state in which no band-like gloss difference or no knocking was observed was judged as A, a state in which a band-like gloss difference or knocking was slightly observed was judged as B, a state in which a band-like gloss difference or knocking was intermittently observed was judged as C, a state in which a large number of band-like gloss differences or knocking was intermittently observed was judged as D, and A, B water was set as pass.
(13) Weight average molecular weight
The measurement was performed using a gel permeation chromatograph 2690 manufactured by Waters corporation using polystyrene as a standard.
(14) Polylactic acid Polymer (P)
A polylactic acid polymer P was obtained by polymerizing lactide produced from L lactic acid having an optical purity of 99.5% in the presence of a tin bis (2-ethylhexanoate) catalyst (molar ratio of lactide to catalyst: 10000: 1) at 180 ℃ for 180 minutes under a nitrogen atmosphere.
[ example 1]
Using the spinning apparatus shown in fig. 2, a polylactic acid polymer P having a weight average molecular weight OF 20 ten thousand was melted at 230 ℃ and supplied to a melt spinning module, the filaments discharged from a discharge port OF a spinning nozzle 5 were cooled, a straight-run spinning finish (an attached amount OF 0.8 wt%) diluted with mineral oil was applied by an oiling roller type oiling device 6, and then drawn and wound up 4.0 times by a 1 st godet roller 7, 8 heated to 100 ℃ and a 2 nd godet roller 9, 10 heated to 115 ℃ and heat-treated, and then traversed by a micro-cam traversing device 11 at a guide angle OF 5.6 °, a yaw width OF 3%, a yaw period OF 4 seconds, a face pressure OF 85N/m, a driving OF 0.1%, a set winding speed (V) OF 3000m/min, a spindle deceleration speed OF 25m/sec, a roll width OF 70mm was obtained under the production conditions OF a face pressure OF 85N/m, a driving OF 0.1%, a set winding speed (V) OF 3000m/min, and a spindle deceleration speed OF 25m/sec, A drum-like wound body of 25dtex polylactic acid monofilament with a winding thickness of 40mm and a winding amount of 1.0kg was wound.
The hardness of the end face of the wound body is 36 to 65, and the CV value of the hardness of the end face of the wound body is 10%, whereby the wound body has a good shape without yarn collapse or yarn falling. Using the obtained wound body, beating evaluation was carried out (25 dtex of polylactic acid monofilament as warp), and as a result, no knocking over occurred at an unwinding speed of 1000m/min, and even at an unwinding speed of 1200m/min, knocking over occurred only 2 bobbins, and high-speed unwinding was good. The fabric quality at the unwinding speed of 1200m/min was a B level to the extent that the difference in band-like gloss and the knocking-over defect were slightly visible, and was a satisfactory level, and the quality was good.
[ example 2]
A drum-like wound body of polylactic acid-based monofilament was obtained under the same conditions as in example 1, except that the yaw rate was changed to 4%. The hardness of the end face of the wound body is 50 to 65, and the CV value of the end face hardness of the wound body is 7%, and it is preferable that no yarn is broken or dropped from the end face of the wound body. The obtained package was subjected to beating-up evaluation in the same manner as in example 1, and as a result, no knocking-over occurred at any unwinding speed, and high-speed unwinding performance was good. Further, the fabric quality at the unwinding speed of 1200m/min was good at a level of A without the defects of poor band-like gloss and knocking-over. That is, the wound body can cope with an increase in the weaving speed, and is excellent in the high-speed unwinding property of the wound body, and high-order passability during weaving and excellent in the quality of the yarn woven fabric can be obtained.
[ example 3]
A drum-like wound body of polylactic acid-based monofilament was obtained under the same conditions as in example 1, except that the yaw rate was changed to 5%. The hardness of the end face of the wound body is 45 to 63, and the CV value of the hardness of the end face of the wound body is 7%, and it is preferable that there is no yarn break or yarn drop at the end face of the wound body. The obtained package was subjected to beating-up evaluation in the same manner as in example 1, and as a result, no knocking was observed at an unwinding speed of 1000m/min, and knocking occurred only at 1 bobbin even at an unwinding speed of 1200m/min, and high-speed unwinding performance was good. Further, the fabric quality at the unwinding speed of 1200m/min was a B level to the extent that the difference in band-like gloss and the loop-off defect were slightly visible, and the quality was good.
[ example 4]
A drum-shaped wound body of a polylactic acid-based monofilament was obtained under the same conditions as in example 1, except that the yaw width was changed to 4% and the spindle deceleration rate was changed to 50 m/sec. The hardness of the end face of the wound body is 40 to 67, the CV value of the hardness of the end face of the wound body is 10%, and the hardness is satisfactory without yarn breakage or yarn falling from the end face of the wound body. The obtained wound body was subjected to beating-up evaluation in the same manner as in example 1, and as a result, no knocking-over occurred at the unwinding speed of 1000m/min, and knocking-over occurred only at 2 bobbins even at the unwinding speed of 1200m/min, and high-speed unwinding property was good. The fabric quality at the unwinding speed of 1200m/min was a good quality at a level of B to the extent that the difference in band-like gloss and the knocking-over defect were slightly observed.
[ example 5]
A drum-like wound body of polylactic acid monofilament was obtained under the same conditions as in example 1, except that the yaw width was changed to 4% and the spindle deceleration rate was changed to 70 m/sec. The hardness of the end face of the wound body is 38 to 65, and the CV value of the hardness of the end face of the wound body is 10%, and the hardness is satisfactory without yarn breakage or yarn falling from the end face of the wound body. The obtained wound body was subjected to beating-up evaluation in the same manner as in example 1, and as a result, no knocking-over occurred at the unwinding speed of 1000m/min, and knocking-over occurred only at 3 bobbins even at the unwinding speed of 1200m/min, and high-speed unwinding property was good. The fabric quality at the unwinding speed of 1200m/min was a good quality at a level of B to the extent that the difference in band-like gloss and the knocking-over defect were slightly observed.
[ example 6]
A drum-like wound body of a polylactic acid-based monofilament of 30dtex was obtained under the same conditions as in example 1, except that the yaw width was changed to 4% and the amount of the polymer discharged from the discharge hole of the spinning nozzle 5 was changed. The hardness of the end face of the wound body is 50 to 60, and the CV value of the end face hardness of the wound body is 7%, and it is preferable that no yarn is broken or dropped from the end face of the wound body. The obtained wound body was evaluated for beating-up in the same manner as in example 1, and as a result, no knocking-over occurred at any unwinding speed, and high-speed unwinding performance was good. The fabric quality at the unwinding speed of 1200m/min was good at a level of A without the defects of poor band-like gloss and knocking-over. That is, the high-speed unwinding property of the wound body is excellent with the increase in the weaving speed, and the high-order passing property during weaving and the excellent quality of the yarn woven fabric can be obtained.
[ example 7]
A 30dtex wound body of polylactic acid monofilament in a drum shape was obtained under the same conditions as in example 1 except that the speed difference between the 2 nd godet rolls 9 and 10 and the winding device 15 was changed, the winding tension was adjusted to 0.10cN/dtex, and the amount of the polymer discharged from the discharge orifice of the spinning nozzle 5 was changed. The hardness of the end face of the wound body is 45 to 70, and the CV value of the end face hardness of the wound body is 10%, and it is preferable that no yarn is broken or dropped from the end face of the wound body. The obtained wound body was subjected to beating-up evaluation in the same manner as in example 1, and as a result, no knocking-over occurred at the unwinding speed of 1000m/min, and knocking-over occurred only at 2 bobbins even at the unwinding speed of 1200m/min, and high-speed unwinding property was good. The fabric quality at the unwinding speed of 1200m/min was a good quality at a level of B to the extent that the difference in band-like gloss and the knocking-over defect were slightly observed.
[ Table 1]
Comparative example 1
A drum-like wound body of a polylactic acid-based monofilament was obtained under the same conditions as in example 1, except that the yaw width was changed to 2% and the spindle deceleration rate was changed to 50 m/sec. The hardness of the end face of the wound body is 32 to 66, and the CV value of the hardness of the end face of the wound body is 16%. The obtained wound body was subjected to beating evaluation in the same manner as in example 1, and as a result, knocking-over occurred in a large amount: 7 cylinders of the ring-off occurs at the unwinding speed of 1000m/min, 15 cylinders of the ring-off occurs at the unwinding speed of 1200m/min, and the high-speed unwinding performance is poor. Further, the fabric quality at the unwinding speed of 1200m/min was at a level C at which the difference in band-like gloss and the knocking-over defect were intermittently observed, and the quality was poor. That is, it is known that the wound body cannot cope with the increase in the weaving speed.
Comparative example 2
A drum-like wound body of a polylactic acid-based monofilament was obtained under the same conditions as in example 1, except that the yaw width was changed to 2% and the spindle deceleration rate was changed to 90 m/sec. The hardness of the end face of the wound body is 30 to 64, and the CV value of the hardness of the end face of the wound body is 16%. The obtained wound body was subjected to beating evaluation in the same manner as in example 1, and as a result, knocking-over occurred in a large amount: 10 bobbins had doffing at the unwinding speed of 1000m/min, and 20 bobbins had doffing at the unwinding speed of 1200m/min, and the high-speed unwinding property was poor. Further, the fabric quality after beating up at an unwinding speed of 1200m/min was found to be a D level to the extent that a large number of band-like gloss differences and loop-off defects were intermittently observed, and the quality was poor. That is, it is known that the wound body cannot cope with the increase in the weaving speed.
Comparative example 3
A drum-shaped wound body of a polylactic acid-based monofilament was obtained under the same conditions as in example 1, except that the yaw width was changed to 2%, the speed difference between the 2 nd godet rollers 9 and 10 and the winding device 15 was changed, the winding tension was adjusted to 0.12cN/dtex, and the spindle deceleration speed was changed to 50 m/sec. The hardness of the end face of the wound body is 25 to 70, and the CV value of the end face hardness of the wound body is 18%, and although no yarn is dropped from the end face of the wound body, yarn breakage occurs at a portion where the hardness of the end face of the wound body is low. The obtained wound body was subjected to beating evaluation in the same manner as in example 1, and as a result, knocking-over occurred in a large amount: 10 bobbins fell off at the unwinding speed of 1000m/min, and 21 bobbins fell off at the unwinding speed of 1200m/min, and the high-speed unwinding property is poor. Further, the fabric quality after beating up at an unwinding speed of 1200m/min was found to be a D level to the extent that a large number of band-like gloss differences and loop-off defects were intermittently observed, and the quality was poor. That is, it is known that the wound body cannot cope with the increase in the weaving speed.
Comparative example 4
A drum-like wound body of 30dtex polylactic acid monofilament was obtained under the same conditions as in example 1, except that the yaw width was changed to 8% and the amount of the polymer discharged from the discharge hole of the spinning nozzle 5 was changed. The hardness of the end face of the wound body is 20 to 65, the CV value of the end face hardness of the wound body is 21%, the yarn breakage occurs in 55 bobbins at the end face of the wound body, and the yarn breakage occurs at a portion where the hardness of the end face of the wound body is low. The obtained wound body was subjected to beating evaluation in the same manner as in example 1, and as a result, knocking-over occurred in a large amount: when the unwinding speed is 1000m/min, 25 bobbins are out of loop, and when the unwinding speed is 1200m/min, 45 bobbins are out of loop, and the high-speed unwinding performance is poor. Further, the fabric quality after beating up at an unwinding speed of 1200m/min was found to be a D level to the extent that a large number of band-like gloss differences and loop-off defects were intermittently observed, and the quality was poor. That is, it is known that the wound body cannot cope with the increase in the weaving speed.
Comparative example 5
A drum-shaped wound body of a polylactic acid-based monofilament was obtained under the same conditions as in example 1, except that the yaw width was changed to 4% and the spindle deceleration rate was changed to 100 m/sec. The hardness of the end face of the wound body is 32 to 65, and the CV value of the hardness of the end face of the wound body is 17%, and although no yarn is dropped on the end face of the wound body, yarn breakage occurs at a portion where the hardness of the end face of the wound body is low. The obtained wound body was subjected to beating evaluation in the same manner as in example 1, and as a result, knocking-over occurred in a large amount: 4 bobbins had to be out of loop at the unwinding speed of 1000m/min, and 9 bobbins had to be out of loop at the unwinding speed of 1200m/min, and the high-speed unwinding property was poor. Further, the fabric quality at the unwinding speed of 1200m/min was at a level C at which the difference in band-like gloss and the knocking-over defect were intermittently observed, and the quality was poor. That is, it is known that the wound body cannot cope with the increase in the weaving speed.
Comparative example 6
A drum-like wound body of polylactic acid monofilament was obtained under the same conditions as in example 1, except that the yaw rate was changed to 4% and the surface tension was changed to 150N/m. The hardness of the end face of the wound body is 22 to 66, the CV value of the end face hardness of the wound body is 20%, 2 bobbins of yarn drop occur at the end face of the wound body, and yarn breakage occurs at a portion where the hardness of the end face of the wound body is low. The obtained wound body was subjected to beating evaluation in the same manner as in example 1, and as a result, knocking-over occurred in a large amount: 14 bobbins had loose loops at the unwinding speed of 1000m/min, and 21 bobbins had loose loops at the unwinding speed of 1200m/min, and the high-speed unwinding property was poor. Further, the fabric quality after beating up at an unwinding speed of 1200m/min was found to be a D level to the extent that a large number of band-like gloss differences and loop-off defects were intermittently observed, and the quality was poor. That is, it is known that the wound body cannot cope with the increase in the weaving speed.
Comparative example 7
A drum-like wound body of a polylactic acid-based monofilament was obtained under the same conditions as in example 1, except that the yaw width was changed to 4%, and the speed difference between the 2 nd godet rolls 9 and 10 and the winding device 15 was changed to change the winding tension to 0.15 cN/dtex. The hardness of the end face of the wound body is 21 to 68, the CV value of the end face hardness of the wound body is 20%, 3 bobbins of yarn breakage also occurs at the end face of the wound body, and yarn breakage occurs at a portion where the hardness of the end face of the wound body is low. The obtained wound body was subjected to beating evaluation in the same manner as in example 1, and as a result, knocking-over occurred in a large amount: 13 bobbins had loose loops at the unwinding speed of 1000m/min, and 21 bobbins had loose loops at the unwinding speed of 1200m/min, and the high-speed unwinding property was poor. Further, the fabric quality after beating up at an unwinding speed of 1200m/min was found to be a D level to the extent that a large number of band-like gloss differences and loop-off defects were intermittently observed, and the quality was poor. That is, it is known that the wound body cannot cope with the increase in the weaving speed.
[ Table 2]
Description of the reference numerals
1: thread line
2: paper tube
3: polylactic acid based monofilament wound body
4: spinning module
5: spinning nozzle
6: oil supply device
7: no. 1 godet roller (U)
8: no. 1 godet roller (L)
9: 2 nd godet roller (U)
10: 2 nd godet roller (L)
11: traversing gear
12: roller drag ring
13: winding side spindle
14: waiting machine side spindle
15: winding device
Claims (1)
1. A drum-shaped wound body formed from a polylactic acid-based monofilament, wherein 50% by weight or more of the polylactic acid-based monofilament is composed of a lactic acid monomer, and each value of the end face hardness measured at 36 at 10 DEG intervals at a portion of the wound body having a thickness of 25mm is in the range of 35 to 70,
the CV value (coefficient of variation,%) of the end face hardness measured at 36 at intervals of 10 ℃ at a portion of a wound body having a thickness of 25mm was 15% or less.
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| JP2018082382 | 2018-04-23 | ||
| JP2018-082382 | 2018-04-23 | ||
| PCT/JP2019/016432 WO2019208352A1 (en) | 2018-04-23 | 2019-04-17 | Drum-shaped package comprising poly(lactic acid)-based monofilaments |
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| JP (1) | JP7415557B2 (en) |
| CN (1) | CN112041253B (en) |
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| JP3496407B2 (en) * | 1996-10-21 | 2004-02-09 | 東レ株式会社 | Drum-shaped package |
| JP4113290B2 (en) * | 1998-09-25 | 2008-07-09 | 積水化学工業株式会社 | Liquid crystal display element spacer and liquid crystal display element |
| TW522179B (en) * | 1999-07-12 | 2003-03-01 | Asahi Chemical Ind | Polyester yarn and producing method thereof |
| JP2001348731A (en) * | 2000-06-06 | 2001-12-21 | Asahi Kasei Corp | Polyester fiber good in false twisting processability |
| JP2003335457A (en) * | 2002-05-16 | 2003-11-25 | Toyobo Co Ltd | Yarn package of excellent high-speed untwining performance and manufacturing method for yarn package |
| JP2004360112A (en) * | 2003-06-04 | 2004-12-24 | Asahi Kasei Fibers Corp | Method for drawing and winding polyhexamethylene adipamide fiber |
| JP4586390B2 (en) * | 2004-03-26 | 2010-11-24 | 東レ株式会社 | Yarn package |
| US7425289B2 (en) * | 2004-06-25 | 2008-09-16 | Celanese Acetate Llc | Process of making cellulose acetate tow |
| JP2007046194A (en) * | 2005-08-10 | 2007-02-22 | Toray Ind Inc | Cheese package of concentric sheath-core conjugated fiber and method for producing the same |
| JP4830743B2 (en) * | 2006-09-14 | 2011-12-07 | 東レ株式会社 | Polyester fiber, woven / knitted fabric, car seat and method for producing polyester fiber |
| JP2008156763A (en) * | 2006-12-21 | 2008-07-10 | Opelontex Co Ltd | Polyester conjugate filament yarn package |
| JP2010121219A (en) * | 2007-03-13 | 2010-06-03 | Denki Kagaku Kogyo Kk | Fiber bundle, and method for producing fiber bundle |
| WO2009028378A1 (en) * | 2007-08-30 | 2009-03-05 | Toray Industries, Inc. | Partly oriented core-sheath polyester composite fiber, cheese-form package, and false-twisted fiber |
| EP2407583B1 (en) * | 2009-03-11 | 2013-10-09 | Toray Industries, Inc. | Liquid crystal polyester fibers and method for producing the same |
| JP5204725B2 (en) * | 2009-06-09 | 2013-06-05 | Ｋｂセーレン株式会社 | Method for producing polyurethane microfiber |
| CN201647741U (en) * | 2010-03-10 | 2010-11-24 | 无锡市百川科技有限公司 | Winding controller of high-speed tension silk machine |
| JP2011207597A (en) * | 2010-03-30 | 2011-10-20 | Toray Ind Inc | Winding method and winding package of single yarn thick fineness multifilament |
| US9751717B2 (en) * | 2010-04-07 | 2017-09-05 | Dsm Ip Assets B.V. | Package with high young's modulus yarn and method for winding the yarn package |
| JP5998673B2 (en) | 2011-06-30 | 2016-09-28 | 東レ株式会社 | Drum-like package of polylactic acid monofilament and method for producing the same |
| JP6446962B2 (en) * | 2014-09-30 | 2019-01-09 | 東レ株式会社 | Polyester false twisted yarn package |
| JP6816509B2 (en) * | 2015-05-29 | 2021-01-20 | 東レ株式会社 | Drum-shaped package made of polylactic acid-based monofilament |
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