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WO2024162095A1 - Multifilament en polyamide et monofilament en polyamide - Google Patents

Multifilament en polyamide et monofilament en polyamide Download PDF

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Publication number
WO2024162095A1
WO2024162095A1 PCT/JP2024/001811 JP2024001811W WO2024162095A1 WO 2024162095 A1 WO2024162095 A1 WO 2024162095A1 JP 2024001811 W JP2024001811 W JP 2024001811W WO 2024162095 A1 WO2024162095 A1 WO 2024162095A1
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WO
WIPO (PCT)
Prior art keywords
polyamide
splitting
multifilament
dtex
polyamide multifilament
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PCT/JP2024/001811
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English (en)
Japanese (ja)
Inventor
一志 南井
久雄 重野
崇志 潤間
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東レ株式会社
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Publication of WO2024162095A1 publication Critical patent/WO2024162095A1/fr

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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
    • D01F6/60—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyamides

Definitions

  • the present invention relates to polyamide multifilaments and polyamide monofilaments.
  • Patent Document 3 shows that good splitting properties can be achieved by setting the load tension on the stylus to 0.20 cN/dtex or less in the entanglement method, and discloses the correlation between the load tension, i.e., entanglement strength, and splitting processability, but does not clarify the ratio of the number of entanglements by load tension. Furthermore, it does not take into consideration that lowering the entanglement strength reduces the bundling properties of the single fibers that make up the multifilament, which leads to twill drop during fiber package winding and the associated decline in splitting processability.
  • high-strength, stiff fibers that can be used in industrial applications tend to have a high tendency for twill drop during package winding, and low bundling properties of single fibers have a large impact on splitting processability.
  • Low yarn bundling properties of single fibers not only affect the splitting process, but also cause uneven stretching between single fibers, which leads to variation in the physical properties of the monofilament after splitting.
  • Patent Documents 4 and 5 differ from those in which multifilaments are split to obtain monofilaments, and although the number of entanglements is specified, the number of entanglements according to the load tension is not taken into consideration.
  • Patent Document 6 does not achieve a high fiber splitting yield comparable to conventional polyester clothing applications, and there remain issues with stable fiber splitting processability and product quality stability of the monofilament physical properties after fiber splitting process.
  • the object of the present invention is to solve the above problems and to provide a high-strength polyamide multifilament with excellent splitting processability, and a high-strength polyamide monofilament and polyamide monofilament obtained by splitting the multifilament and having stable product quality.
  • the present invention has been made through extensive research in order to solve the above problems, and has the following configuration.
  • a polyamide multifilament having an intertwining number A (pieces/m) under low load tension conditions that is greater than 0.3 and less than 3.0, a ratio A/B of the intertwining number B (pieces/m) under high load tension conditions that is 1.5 or more, a single yarn fineness of 6 to 40 dtex, and a strength of 7.0 to 11.0 cN/dtex.
  • the polyamide multifilament according to (1) above having 8 to 16 single fibers and an elongation of 20 to 35%.
  • the present invention makes it possible to provide high-strength polyamide multifilament with excellent splitting processability, and to provide high-strength monofilament with stable product quality.
  • FIG. 1 is a schematic diagram of the process for producing a polyamide multifilament of the present invention.
  • the raw materials used for the polyamide multifilament of the present invention are not particularly limited as long as they are polyamides, such as nylon 6, nylon 66, nylon 12, nylon 46, nylon 410, nylon 56, nylon 510, nylon 610, copolymer polyamides of nylon 6 and nylon 66, and copolymer polyamides obtained by copolymerizing nylon 6 with polyalkylene glycol, dicarboxylic acid, amine, etc.
  • the polyamide multifilament of the present invention may contain end-capping agents such as monocarboxylic acids, matting agents such as titanium oxide, polymerization catalysts and heat resistance agents such as phosphorus compounds, antioxidants and heat stabilizers such as copper compounds and alkali metal or alkaline earth metal halides, as components other than polyamide, but the polyamide component is preferably 95% by weight or more, and more preferably 97% by weight or more. If the polyamide component is less than 95% by weight, the mechanical properties of the polyamide are reduced, which is not preferable.
  • end-capping agents such as monocarboxylic acids, matting agents such as titanium oxide, polymerization catalysts and heat resistance agents such as phosphorus compounds, antioxidants and heat stabilizers such as copper compounds and alkali metal or alkaline earth metal halides, as components other than polyamide, but the polyamide component is preferably 95% by weight or more, and more preferably 97% by weight or more. If the polyamide component is less than 95% by weight, the mechanical properties
  • the polyamide multifilament of the present invention must have an entanglement number A under low load tension conditions of more than 0.3 pieces/m and less than 3.0 pieces/m. Preferably, it is more than 0.3 pieces/m and less than 2.5 pieces/m, and more preferably more than 0.3 pieces/m and less than 2.0 pieces/m.
  • the entanglement number A under low load tension conditions in the present invention is the entanglement number measured using an automatic entanglement tester (e.g., Entanglement Tester R-2072 manufactured by ROTHSCHILD) capable of carrying out the same procedure as the method described in JIS L1013 (2010) 8.15, at a trip level of 0.17 cN/dtex, an initial tension of 0.05 cN/dtex, a measurement speed of 10 m/min, and a yarn length of 1000 m, and is, for example, the value obtained by the measurement described in the Examples section.
  • an automatic entanglement tester e.g., Entanglement Tester R-2072 manufactured by ROTHSCHILD
  • the number of entanglements A under low-load tension conditions as in the present invention is greater than 0.3 pieces/m and less than 3.0 pieces/m, the bundling between the single fibers constituting the multifilament is appropriately imparted, thereby suppressing single-yarn twill drop during yarn package winding and the associated yarn breakage during the splitting process.
  • the number of entanglements under low-load tension conditions is 3.0 pieces/m or more, there are problems in that the entanglement between the single fibers is too strong, resulting in poor splitting during the splitting process, and that tension is concentrated on the highly entangled fibers, resulting in variations in the quality of the monofilament after splitting.
  • the bundling between the single fibers is not imparted, resulting in twill drop during yarn package winding, which causes yarn breakage during splitting processing.
  • the ratio A/B of the number of entanglements A (pieces/m) under low load tension conditions to the number of entanglements B (pieces/m) under high load tension conditions is 1.5 or more. It is preferably 2.0 or more, and more preferably 2.5 or more.
  • the number of entanglements B under high load tension conditions in this invention is the number of entanglements measured using an automatic entanglement tester (e.g., Entanglement Tester R-2072 manufactured by ROTHCHILD) capable of carrying out the same procedure as the method described in JIS L1013 (2010) 8.15, at a trip level of 0.51 cN/dtex, an initial tension of 0.05 cN/dtex, a measurement speed of 10 m/min, and a yarn length of 1000 m, and is, for example, the value obtained by the measurement described in the Examples section.
  • an automatic entanglement tester e.g., Entanglement Tester R-2072 manufactured by ROTHCHILD
  • the intertwining number ratio A/B is 1.5 or more as in the present invention, it means that there are many intertwinings that are detected under low load tension conditions but not detected under high load tension conditions, and such intertwinings slip through the entanglement of single fibers under the tension during splitting processing, so that yarn breakage does not occur, i.e., the form of "micro-entanglement" has been discovered and its characteristics have been clarified.
  • the intertwining number ratio within this range, it is possible to reduce yarn breakage during splitting processing due to entanglement of single fibers while imparting single fiber bundling properties to a degree that can suppress twill drop during yarn package winding, and it has been confirmed that there is a correlation with the success rate of splitting processing.
  • the polyamide multifilament of the present invention has a single fiber fineness of 6 to 40 dtex. It is preferably 7 to 37 dtex, and more preferably 8 to 34 dtex. If the single fiber fineness exceeds 40 dtex, the cooling efficiency during spinning deteriorates, lowering the raw yarn quality and making it difficult to obtain high strength quality suitable for industrial use. If it is less than 6 dtex, entanglement of single fibers easily occurs, making it difficult to control the entanglement number ratio under two types of tension, and making it difficult to realize a "micro-entanglement" form.
  • the strength of the polyamide multifilament of the present invention is 7.0 to 11.0 cN/dtex. It is preferably 7.5 to 9.5 cN/dtex. When the strength is in this range, high strength quality can be obtained for the monofilament after splitting the multifilament. A strength of less than 7.0 cN/dtex is insufficient for high strength monofilament for industrial use. When attempting to obtain polyamide multifilament with a strength exceeding 11.0 cN/dtex, mechanical stretching is performed at a high ratio, which often results in the generation of fuzz and the associated breakage of yarn during splitting.
  • the elongation of the polyamide multifilament of the present invention is preferably 20.0% to 35.0%. More preferably, it is 22.0% to 35.0%. By setting it within this range, a certain degree of stretch is allowed during the splitting process, resulting in good splitting properties. In addition, the toughness and breaking work of the monofilament after splitting can be increased, and excellent durability can be maintained.
  • the strength (cN/dtex) and elongation (%) are values measured under the constant-speed elongation conditions specified in JIS L1013 (1999) 8.5.1 standard time test.
  • the number of single fibers in the polyamide multifilament of the present invention is preferably 8 to 16. More preferably, it is 12 to 16.
  • the number of bobbins that can be split and wound with a typical splitting machine is 16, by setting the number of single fibers to a specified number, it is possible to make a multifilament into a monofilament in one splitting process.
  • the coefficient of variation (CV value) of variation in strength and fineness of each single fiber constituting the polyamide multifilament of the present invention is less than 5.0.
  • each is less than 4.0. More preferably, each is less than 3.5.
  • the variation coefficient of variation (CV value) of the oil adhesion rate of each single fiber constituting the polyamide multifilament of the present invention is preferably less than 10.0. More preferably, it is less than 8.0.
  • the variation coefficient of variation (CV value) of the oil adhesion rate of each single fiber is measured by measuring the oil adhesion rate of each monofilament obtained by splitting the polyamide multifilament under the conditions of a splitting speed of 400 m/min and a splitting tension of 0.75 cN/dtex using the method described below, and calculating the average value and standard deviation from the measurement data, and then calculating the variation coefficient (CV value) according to the following formula:
  • Variation coefficient (%) [Standard deviation] / [Average value] x 100 This is the value calculated by:
  • the stretching tension applied during hot stretching becomes uniform for each monofilament, making it possible to suppress stretching unevenness. Furthermore, friction between the single fibers that occurs during the splitting process is made uniform, resulting in good splitting properties.
  • the oil agent used there are no particular limitations on the oil agent used, so long as it is a known oil agent.
  • FIG. 1 is a schematic diagram of a direct spinning and drawing apparatus preferably used in the present invention.
  • FIG. 1 the method for producing the polyamide multifilament of the present invention will be explained using FIG. 1 as an example, but the production method is not limited to this as long as the polyamide multifilament of the present invention can be obtained.
  • the sulfuric acid relative viscosity (hereinafter referred to as viscosity) of the raw material chips for the polyamide multifilament of the present invention is preferably 2.5 to 3.9, and more preferably 3.0 to 3.9. Within this range, a high-strength polyamide multifilament can be obtained with good spinnability.
  • the sulfuric acid relative viscosity refers to the value measured at 25°C by dissolving a sample in 98% sulfuric acid and using an Ostwald viscometer.
  • the polyamide chips are fed to an extruder-type spinning machine, and placed in a spinneret by a metering pump for melt spinning.
  • the spinning temperature is set to a value 50°C higher than the melting point of the polymer, and the polymer is discharged from a spinneret 1 having preferably 8 to 16 holes. It is preferable to pass the polymer through a heating cylinder 2 that surrounds an area of 5 to 300 cm from directly below the spinneret.
  • the temperature inside this heating cylinder is preferably -30 to +30°C relative to the melting point of the polymer polyamide, and more preferably -15 to +15°C.
  • the undrawn yarn 5 that has passed through the high-temperature atmosphere is then cooled and solidified by blowing air at 10 to 80°C, preferably 10 to 50°C, onto it using a cross-flow cooling device 3. If the cooling air exceeds 80°C, the fibers will shake more during spinning, causing collisions between single fibers and resulting in poor spinnability.
  • a uniflow chimney is preferred as the cross-flow cooling device.
  • the cooled yarn is oiled by an oiling device 4 consisting of an oiling roll, taken up by a take-up roller (1FR) 6, stretched, and then wound up.
  • an oiling device 4 consisting of an oiling roll, taken up by a take-up roller (1FR) 6, stretched, and then wound up.
  • the oiling roll is matte-finished.
  • the contact area between the yarn and the roll is increased, making it possible to reduce variation in the oil adhesion rate between single fibers.
  • Any known oil can be used for the oil applied, but in order to suppress winding of the single yarn on the take-up roller (1FR) 6, the amount of oil applied is preferably 0.3 to 1.5% by weight, and more preferably 0.5 to 1.0% by weight.
  • the spinning speed defined by the rotation speed of the take-up roller (1FR) 6, is 400 to 1200 m/min. If the spinning speed is 400 m/min or more, the final production speed will be sufficient, and polyamide multifilament can be produced efficiently and inexpensively. A spinning speed of 1200 m/min or less is preferable because it can prevent frequent thread breakage and fuzzing.
  • the spun yarn obtained by the above-mentioned methods can be stretched, heat-treated to relax, and wound up using known methods.
  • the spun yarn taken up by the take-up roller (1FR) 6 is wound around the yarn feed roller (2FR) 7, the first stretch roller (1DR) 8, the second stretch roller (2DR) 10, and the relaxation roller (RR) 11 in that order, where it is subjected to heat treatment and stretching, and then wound up on the winder 13.
  • Pre-stretching is performed between 1FR and 2FR, the first stage of stretching is performed between 2FR and 1DR, and the second stage of stretching is performed between 1DR and 2DR.
  • the temperature of 2FR is set to -20°C to +20°C of the polymer's glass transition temperature, and the temperature of 1DR is set to 100 to 225°C, and it is preferable that pre-stretching and the first stage of stretching are hot stretched around the glass transition temperature.
  • the remaining stretching and heat setting temperatures are usually preferably performed at high temperatures between -20°C to +20°C of the polymer's crystallization temperature.
  • the total draw ratio that is, the ratio between the take-up roller (1FR) 6 and the second draw roller (2DR) 10, in order to obtain a high-strength polyamide multifilament
  • the draw ratio it is preferable to adopt a high draw ratio, and if the fineness range described in this invention is within the range, drawing at 3.5 to 5.0 times will suffice.
  • the winding speed is usually preferably 1500 to 4500 m/min, and more preferably 2000 to 4500 m/min.
  • a first entanglement nozzle 9 between the first stretching roller (1DR) 8 and the second stretching roller (2DR) 10, and a second entanglement nozzle 12 between the relaxation roller (RR) 11 and the winder 13 to fluid-treat the yarn when winding it into a polyamide multifilament package.
  • the polyamide multifilament obtained by the above method can be processed using a known fiber splitting method to produce high-strength polyamide monofilament with stable product quality at a good processing yield.
  • Total fineness The total fineness was determined by measuring the correct fineness at a specified load of 0.045 cN/dtex according to JIS L1013 (1999) 8.3.1 A method.
  • Tenacity, strength and elongation Measured under the constant speed elongation conditions specified in JIS L1013 (1999) 8.5.1 Standard Time Test.
  • the sample was a Tensilon UCT-100 manufactured by Orientec Co., Ltd., with a gripping distance of 25 cm and a pulling speed of 30 cm/min.
  • Tenacity was determined from the maximum strength in the S-S curve, elongation from the elongation at the point showing the maximum strength in the S-S curve, and strength was determined by dividing the strength by the total fineness. Sampling was done every 1 m in the longitudinal direction of the multifilament sample, measurements were taken at 5 points, and the average value was calculated from the measurement data.
  • Intertwining number ratio A/B by load tension Calculated by dividing the intertwining number A (pieces/m) measured in (6) above by the intertwining number B (pieces/m).
  • Fiber splitting processability Using an AIKI Liotech fiber splitting machine KA-516OF, 50 multifilament packages each weighing 5.0 kg were split into monofilaments without yarn breakage, and the percentage of packages that could be split into monofilaments was expressed as the full tube rate (%).
  • the fiber splitting process was performed at a fiber splitting speed of 400 m/min and a fiber splitting tension of 0.75 cN/dtex.
  • S Fill rate of 85% or more
  • A Fill rate of 70% or more but less than 85%
  • B Fill rate of 55% or more but less than 70%
  • C Fill rate of 30% or more but less than 55%.
  • Variation rate of strength of each single fiber The strength of each monofilament obtained from the same package that was subjected to fiber splitting processing under the conditions in (8) above was measured in the same manner as in (5) above, and the average value and standard deviation were calculated from the measurement data, and the variation rate was calculated using the formula described in (9) above.
  • Coefficient of variation in oil adhesion rate for each single fiber The amount of oil adhesion for each monofilament obtained from the same package that was subjected to fiber splitting processing under the conditions in (8) above was measured using the hexane extraction method in accordance with JIS L1096 (2010) 8.32, and the average value and standard deviation of the oil adhesion rate were calculated from the measurement data, and the coefficient of variation was calculated using the formula in (9) above.
  • Example 1 A 5% by weight aqueous solution of copper acetate was added as an antioxidant to the nylon 66 chips obtained by liquid phase polymerization, and mixed to add and adsorb 68 ppm of copper to the polymer weight. Next, a 50% by weight aqueous solution of potassium iodide and a 20% by weight aqueous solution of potassium bromide were added and adsorbed so that 0.1 parts by weight of potassium was added to 100 parts by weight of the polymer chips, and solid-phase polymerization was performed using a batch-type solid-phase polymerization device to obtain nylon 66 pellets with a sulfuric acid relative viscosity of 3.75.
  • the obtained nylon 66 pellets were fed to an extruder with a diameter of 110 mm and melted at a melting temperature of 300°C.
  • the discharge amount of the molten polymer was adjusted by a metering pump so that a multifilament with a total fineness of 175 dtex was obtained, and the molten polymer was placed in a spinning pack. After that, it was filtered through a metal nonwoven fabric filter having a roughness of 40 ⁇ m in the spinning pack, and then spun through a die with circular holes and 16 holes.
  • a heating cylinder with a length of 15 cm was installed 3 cm below the face of the nozzle, and was heated so that the atmospheric temperature inside the cylinder was 250° C.
  • the atmospheric temperature inside the cylinder refers to the air temperature at the center of the heating cylinder length, 1 cm away from the inner wall.
  • a uniflow chimney that blows air from one direction was installed directly below the heating cylinder, and cold air of 20° C. was blown onto the yarn at a speed of 35 m/min to cool and solidify it. After that, an oiling agent was applied to the yarn using an oiling roll (oil supply roll) with a matte finish.
  • the undrawn yarn treated with oil was wound around the 1FR rotating at a surface speed of 850 m/min, and then drawn at a total draw ratio of 4.1 times.
  • the drawn yarn was continuously stretched by 5% between the take-up roller and the 2FR without being wound up, and then the first stage of drawing was performed at a rotation speed ratio of 2.80 times, followed by a second stage of drawing at a rotation speed ratio of 1.40 times, and then wound up at a speed of 3500 m/min.
  • the roller surfaces of 1FR and 2FR were mirror-finished, while 1DR, 2DR, and RR were matte-finished.
  • the roller temperatures were as follows: 1FR was unheated, 2FR was 40°C, 1DR was 150°C, 2DR was 225°C, and RR was 150°C.
  • Nylon 66 multifilament was obtained by such melt spinning and drawing.
  • the entanglement process was carried out by spraying high-pressure air perpendicular to the running yarn in the entanglement device. Guides were provided before and after the entanglement nozzle to regulate the running yarn, and the pressure of the sprayed air was set to 0.30 MPa for the first entanglement nozzle and 0.10 MPa for the second entanglement nozzle.
  • Example 2 The same procedure as in Example 1 was carried out except that the second entangling nozzle pressure was set to 0.07 MPa.
  • Example 3 The same procedure as in Example 1 was carried out except that the second entangling nozzle pressure was set to 0.13 MPa.
  • Example 4 The same procedure as in Example 1 was carried out except that the total fineness of the polyamide multifilament was 110 dtex, the draw ratio was changed between 1DR and 2DR, and the total draw ratio was 4.2 times.
  • Example 5 The same procedure as in Example 1 was carried out except that the total fineness of the polyamide multifilament was 350 dtex, the draw ratio was changed between 1DR and 2DR, and the total draw ratio was 4.5 times.
  • Example 6 The same procedure as in Example 1 was carried out except that a mirror-finished oiling roll was used.
  • Example 7 The same procedure as in Example 1 was carried out except that the first entangling nozzle pressure was set to 0.00 MPa.
  • Example 8 Nylon 6 pellets with a sulfuric acid relative viscosity of 3.30 were used and melt spun at 270°C.
  • the molten polymer was spun through a spinneret with 14 circular holes, with the discharge rate adjusted by a metering pump so that a multifilament with a total fineness of 470 dtex was obtained.
  • the total draw ratio was 4.7 times and the roll was wound at a winding speed of 2100 m/min.
  • the temperatures of the rollers were as follows: 1FR was unheated, 2FR was 40°C, 1DR was 150°C, 2DR was 200°C, and RR was 150°C.
  • a nylon 6 multifilament was obtained by such melt spinning and drawing.
  • the pressure of the air sprayed in the intertwining treatment was set to 0.20 MPa at the first intertwining nozzle and 0.20 MPa at the second intertwining nozzle. The rest was the same as in Example 1.
  • Example 9 The same procedure as in Example 8 was carried out except that the total fineness of the polyamide multifilament was 235 dtex and the total draw ratio was 4.5 times.
  • Example 10 The same procedure as in Example 1 was repeated except that nylon 410 pellets having a relative viscosity of 3.60 in sulfuric acid were used.
  • Example 11 The same procedure as in Example 8 was repeated except that nylon 610 pellets having a relative viscosity of 3.80 in sulfuric acid were used.
  • the polyamide multifilament of the present invention achieves high strength and good splitting processability by controlling the ratio A/B between low load tension condition A and high load tension condition B within a specified range.
  • Example 1 The same procedure as in Example 1 was carried out except that the second entangling nozzle pressure was set to 0.00 MPa.
  • Example 2 The same procedure as in Example 1 was carried out except that the second entangling nozzle pressure was set to 0.25 MPa.
  • Example 3 The same procedure as in Example 1 was carried out except that the total fineness of the polyamide multifilaments was 78 dtex and the second entangling nozzle pressure was 0.05 MPa.
  • Example 4 The same procedure as in Example 1 was carried out except that the total fineness of the polyamide multifilament was 700 dtex, the second interlacing nozzle pressure was 0.25 MPa, the total draw ratio was 4.5 times, and the take-up speed was 2700 m/min.
  • Example 5 The same procedure as in Example 1 was carried out except that spinning was performed with the second entangling nozzle pressure set to 0.00 MPa and the total draw ratio set to 2.7 times.
  • Example 6 (Comparative Example 6) The same procedure as in Example 8 was repeated, except that spinning was performed with the second entangling nozzle pressure set to 0.00 MPa and the total draw ratio set to 3.3 times.
  • the second interlacing nozzle pressure was 0.25 MPa, and the pressure per single fiber size was 0.023 MPa/dtex.
  • the interlacing number A under low load tension conditions and the interlacing number B under high load tension conditions were almost the same value, resulting in a normal interlacing form.
  • the splitting processability of such polyamide multifilament was significantly deteriorated.
  • the total fineness of the polyamide multifilament was 78 dtex and the single fiber fineness was 4.9 dtex.
  • the second entanglement nozzle pressure was set to 0.05 MPa, and the second entanglement nozzle pressure per single fiber fineness was controlled to 0.010 MPa/dtex.
  • the number of entanglements A under low load tension conditions could be controlled within the range specified by the present invention, but the number of entanglements B under high load tension conditions also reached a similar value, and the "micro-entanglement" form could not be expressed. This resulted in an effect on the splitting processability of such polyamide multifilament.
  • Comparative Example 4 the total fineness of the polyamide multifilament was 700 dtex and the single fiber fineness was 43.8 dtex. In this case, the cooling efficiency during spinning deteriorated, causing a decrease in the quality of the raw yarn, and the strength level specified in the present invention could not be achieved.
  • Reference Example 1 corresponds to an example in which polyamide multifilament was produced with reference to the method described in the examples of Patent Document 6.
  • the bundling between the single fibers was extremely deteriorated, leaving issues with respect to the splitting processability and the full tube rate of the splitting process.
  • the coefficient of variation of strength variation between single fibers and the coefficient of variation of oil adhesion rate between single fibers were extremely poor, leaving concerns about the product quality stability of such monofilament.
  • the polyamide multifilament of the present invention has high strength yet excellent splitting properties, and the variation in physical properties between single fibers is suppressed, making it possible to provide a high-strength monofilament with stable product quality. This will expand the range of applications for polyamide monofilament and improve the sophistication of existing products that use monofilaments, such as sports strings and screen gauze.

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  • Textile Engineering (AREA)
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Abstract

Le but de la présente invention est de produire un monofilament de résistance élevée présentant une qualité de produit stable avec un rendement de traitement élevé, à l'aide d'un multifilament en polyamide qui possède non seulement une résistance élevée, mais également une excellente séparation de filaments et qui ne pourrait pas être obtenu par l'état de la technique. La présente invention concerne un multifilament en polyamide et un monofilament en polyamide obtenu en soumettant ledit multifilament en polyamide à une séparation de filaments, le multifilament en polyamide étant caractérisé en ce qu'il présente un nombre d'entrelacements A (entrelacements/m) de 0,3 à 3,0 (à l'exclusion de 0,3 et 3,0) dans des conditions de tension à faible charge, un rapport A/B, qui est un nombre d'entrelacements A par rapport à un nombre d'entrelacements B (d'entrelacements/m), d'au moins 1,5 dans des conditions de tension à charge élevée, une finesse de fil unique de 6 à 40 dtex et une résistance de 7,0 à 11,0 cN/dtex.
PCT/JP2024/001811 2023-01-30 2024-01-23 Multifilament en polyamide et monofilament en polyamide WO2024162095A1 (fr)

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Citations (4)

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Publication number Priority date Publication date Assignee Title
WO2013084322A1 (fr) * 2011-12-07 2013-06-13 旭化成せんい株式会社 Fibre synthétique
WO2019146600A1 (fr) * 2018-01-25 2019-08-01 東レ株式会社 Multifilament de polyamide et dentelle tricotée fabriquée à l'aide de celui-ci
WO2019163971A1 (fr) * 2018-02-26 2019-08-29 東レ株式会社 Multifilament de polyamide 610
JP2020158906A (ja) * 2019-03-26 2020-10-01 東レ株式会社 高強度ポリアミドモノフィラメント

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013084322A1 (fr) * 2011-12-07 2013-06-13 旭化成せんい株式会社 Fibre synthétique
WO2019146600A1 (fr) * 2018-01-25 2019-08-01 東レ株式会社 Multifilament de polyamide et dentelle tricotée fabriquée à l'aide de celui-ci
WO2019163971A1 (fr) * 2018-02-26 2019-08-29 東レ株式会社 Multifilament de polyamide 610
JP2020158906A (ja) * 2019-03-26 2020-10-01 東レ株式会社 高強度ポリアミドモノフィラメント

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