Classifications

• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
  • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
  • D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
  • D02G3/04—Blended or other yarns or threads containing components made from different materials
  • D02G3/047—Blended or other yarns or threads containing components made from different materials including aramid fibres
• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
  • D02J13/00—Heating or cooling the yarn, thread, cord, rope, or the like, not specific to any one of the processes provided for in this subclass
• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
  • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
  • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
  • D02G3/36—Cored or coated yarns or threads
• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
  • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
  • D02G3/44—Yarns or threads characterised by the purpose for which they are designed
  • D02G3/48—Tyre cords
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
  • D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
  • D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
  • D10B2331/021—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides aromatic polyamides, e.g. aramides
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2401/00—Physical properties
  • D10B2401/06—Load-responsive characteristics
  • D10B2401/063—Load-responsive characteristics high strength
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2505/00—Industrial
  • D10B2505/02—Reinforcing materials; Prepregs
  • D10B2505/022—Reinforcing materials; Prepregs for tyres

Definitions

• the present application relates to a cord including a bio-based component and a method for preparing the same.
• the present application relates to a hybrid cord that includes a first primarily twisted yarn formed by imparting twist to a bio-nylon fiber, and a second primarily twisted yarn formed by imparting twist to a dissimilar resin fiber different from the bio-nylon, and a method for preparing the same.
• a cord used as a rubber reinforcing material for automobile tires must satisfy the physical properties that can maintain the stability and durability of the tire in consideration of the driving conditions specific to the tire.
• a tire cord must have excellent balance between physical properties such as strength, constant load elongation, elongation at break, dry heat shrinkage, and the like, and also must be able to provide excellent fatigue resistance characteristics.
• tire reinforcement materials receive relatively high loads in an environment where repeated tension and compression are applied, the strength retention rate is decreased if a cord with high modulus (i.e., relatively low elongation) is used in a fatigue environment as described above.
• having a modulus value as low as possible helps to improve the fatigue resistance performance of the cord, and consequently, it helps to improve the durability of the tire.
• a cord for tire reinforcement can be prepared by twisting a component called a primarily twisted yarn, wherein the filament or fiber component included in the primarily twisted yarn can be selected in consideration of performance required for the use as a tire reinforcement material.
• a component called a primarily twisted yarn wherein the filament or fiber component included in the primarily twisted yarn can be selected in consideration of performance required for the use as a tire reinforcement material.
• an aramid fiber is high in modulus, and is small in the amount of change of modulus at room temperature and high temperature, it is mainly used for high-quality tires because it has an advantage in suppressing a flat spot phenomenon, which are deformed when parked for a long period of time.
• the aramid fiber is expensive and have poor fatigue resistance due to their high modulus properties.
• a cord that includes a primarily twisted yarn which is dissimilar fiber components different from each other, and one of the dissimilar fiber components is a bio-based nylon (or bio-nylon), and a method for preparing the same.
• the hybrid cord of the present application can provide physical properties having commercially required level (i.e., physical properties of levels the cord including a conventional chemical-based nylon primarily twisted yarn has) in terms of properties such as strength, constant load elongation, elongation at break, dry heat shrinkage, adhesive strength, and/or fatigue resistance, etc. even while using a bio-based nylon.
• commercially required level i.e., physical properties of levels the cord including a conventional chemical-based nylon primarily twisted yarn has
• properties such as strength, constant load elongation, elongation at break, dry heat shrinkage, adhesive strength, and/or fatigue resistance, etc. even while using a bio-based nylon.
• the inventor of the present application confirmed that when conventional chemical-based nylon fibers used in the preparation of hybrid tire cords are replaced with bio-nylon fibers, the bio-nylon fibers exhibit high modulus properties (i.e., low constant load elongation) as compared with chemical-based nylon fibers.
• the initial modulus on the stress-strain curve pattern is high, the force received during tension and compression increases, and fatigue resistance deteriorates.
• the chemical-based nylon fiber has a lower modulus than other materials, it has an advantageous function in securing the fatigue resistance of cords and tires in a situation where tension and compression are repeated.
• the inventors of the present application have developed a hybrid cord that can solve the supply and demand problems of synthetic raw materials and the resulting price fluctuation problems, is eco-friendly, and can provide physical properties of the level equivalent to or higher than those of the conventional hybrid cord (including chemical-based nylon primarily twisted yarn), and completed the invention of the present application.
• bio-based nylon or bio-nylon may mean that a component used in the preparation of nylon is derived from natural resources, for example, vegetable resources.
• the bio-based nylon may be or include PA56 or nylon 56.
• the bio-based nylon can be formed, for example, by reacting with pentamethylenediamine, which is synthesized from an enzymatic reaction, a yeast reaction or a fermentation reaction from a bio-mass-based compound such as glucose or lysine, with a dicarboxylic acid.
• bio-based nylon primarily twisted yarn may be confirmed by (radioactive) carbon dating.
• bio-nylon derived from bio-mass such as glucose or lysine the half-life of the isotope is different from that of chemical-based nylon.
• ASTM American Material Testing Association
• CEN European Standardization Commission
• the term "cord” may mean a hybrid cord including at least dissimilar fibers different from each other.
• the cord may mean a hybrid cord including at least two or more primarily twisted yarns including dissimilar fibers different from each other.
• the hybrid cord may mean that a coating agent such as an adhesive is coated onto a fiber component (plied twisted yarn), that is, a dipped cord.
• a cord including at least two dissimilar fibers in a state in which the coating agent is not coated onto the fiber component may be referred to as a raw cord.
• the cord or the raw cord has a plied twisted yarn structure in which at least a first primarily twisted yarn and a second primarily twisted yarn are secondarily twisted together (that is, prepared by twisting the primarily twisted yarns).
• primarily twisting means twisting a yarn or a filament in either direction
• primarily twisted yarn may mean a single ply yarn made by twisting yarn or filaments in one direction, that is, a single yarn.
• the primary twisting may mean, for example, a clockwise or counterclockwise twisting.
• wound twisted yarn may mean a yarn made by twisting two or more primarily twisted yarns together in one direction.
• the secondary twisting may mean twisting in a direction opposite to the twist in which the primary twisting is performed.
• the secondary twisting may mean twisting in a counterclockwise or clockwise direction.
• the primarily twisted yarn or plied twisted yarn prepared by imparting twist in any direction may have a predetermined number of twists.
• the "number of twists" means the number of twists per 1 m, and the unit may be TPM (Twist Per Meter).
• an eco-friendly cord including a bio-based fiber.
• the bio-based fiber included in the cord may be referred to as a bio-based nylon fiber or a bio-nylon fiber, and is included in the primarily twisted yarn constituting the cord.
• the bio-nylon has different properties from chemical-based nylon. For example, as confirmed in Experiments described later (see Table 1), the bio-nylon has a higher modulus than the chemical-based nylon. Specifically, looking at Table 1, when the chemical-based PA66 and the bio-nylon PA56 have a fineness in the range of 700 to 1500 denier in common (in Table 1, about 845 denier), it is confirmed that the constant load elongation of the bio-nylon yarn is low.
• the bio-nylon yarn has a constant load elongation (4.7 Constant load elongation of cN/dtex) of 15% or less, 14% or less, or 13% or less, 12% or less, 11 % or less, 10% or less, or 9% or less as measured according to ASTM D885.
• the lower limit of the constant load elongation may be 5% or more, 6% or more, 7% or more, 8% or more, 9% or more, or 10% or more.
• the cord includes a hybrid raw cord; and a coating layer formed on the hybrid raw cord.
• the hybrid raw cord includes a first primarily twisted yarn formed by imparting twist to a bio-nylon fiber having a fineness of 600 to 2000 denier; and a second primarily twisted yarn formed by imparting twist to a dissimilar resin fiber different from the bio-nylon having a fineness of 800 to 2200 denier, wherein a twist number of the first primarily twisted yarn is in the range of 250 to 600 TPM, and wherein the hybrid raw cord contains the first primarily twisted yarn in an amount of 20 to 50% by weight relative to 100% by weight of the total weight.
• the hybrid raw cord provided according to the present application satisfies the strength retention rate of 90% or more after an 8-hour disk fatigue test performed according to JIS-L 1017 method of Japanese Standard Association (JSA).
• the cord that reinforces the performance of the tire shows different characteristics (physical properties) depending on the thickness.
• a thicker cord improves the performance of the tire in terms of strength and modulus, but the thickness of the rubber that covers the top/bottom of the cord fabric becomes thicker and the size of the tire increases, which thus increases the weight. Therefore, this is unsuitable for a tire where fuel efficiency and weight reduction are important.
• the thickness of the cord is thin, it is advantageous for reducing the weight of the tire, but the strength and modulus are lowered, which makes it impossible to sufficiently exhibit the performance as a reinforcing material.
• the fineness of the fibers forming the cord (the fineness of each fiber forming the primarily twisted yarn) is appropriately adjusted in consideration of these points.
• the bio-based nylon primarily twisted yarn may include a bio-based nylon fiber (filament) having a fineness of 600 to 2000 denier (de).
• the lower limit of the fineness of the bio-based nylon fiber may be 650 denier or more, 700 denier or more, 750 denier or more, 800 denier or more, 850 denier or more, 900 denier or more, 950 denier or more, 1000 denier or more, 1050 denier or more, 1100 denier or more, 1150 denier or more, 1200 denier or more, 1250 denier or more, 1300 denier or more, 1350 denier or more, or 1400 denier or more.
• the upper limit thereof may be, for example, 1950 denier or less, 1900 denier or less, 1850 denier or less, 1800 denier or less, 1750 denier or less, 1700 denier or less, 1650 denier or less, 1600 denier or less, 1550 denier or less, 1500 denier or less, 1450 denier or less, 1400 denier or less, 1350 denier or less, 1300 denier or less, 1250 denier or less, 1200 denier or less, 1150 denier or less, 1100 denier or less, 1050 denier or less, 1000 denier or less, 950 denier or less, 900 denier or less, 850 denier or less, 800 denier or less, 750 denier or less, or 700 denier or less.
• the second primarily twisted yarn may include fibers (filaments) having a fineness of 800 to 2200 denier.
• the lower limit of the fineness of the fibers used for forming the second primarily twisted yarn may be 850 denier or more, 900 denier or more, 950 denier or more, 1000 denier or more, 1050 denier or more, 1100 denier or more, 1150 denier or more, 1200 denier or more, 1250 denier or more, 1300 denier or more, 1350 denier or more, 1400 denier or more, 1450 denier or more, 1500 denier or more, 1550 denier or more, 1600 denier or more, 1650 denier or more, 1700 denier or more, 1750 denier or more, 1800 denier or more, 1850 denier or more, 1900 denier or more, 1950 denier or more, 2000 denier or more, 2050 denier or more, or 2100 denier or more.
• the upper limit thereof may be, for example, 2150 denier or less, 2100 denier or less, 2050 denier or less, 2000 denier or less, 1950 denier or less, 1900 denier or less, 1850 denier or less, 1800 denier or less, 1750 denier or less, 1700 denier or less, 1650 denier or less, 1600 denier or less, 1550 denier or less, 1500 denier or less, 1450 denier or less, 1400 denier or less, 1350 denier or less, 1300 denier or less, 1250 denier or less, 1200 denier or less, 1150 denier or less, 1100 denier or less, 1050 denier or less, 1000 denier or less, 950 denier or less, or 900 denier or less.
• the hybrid raw cord may include a first primarily twisted yarn formed by imparting twist to a bio-nylon fiber having a fineness of 700 to 1500 denier, and a second primarily twisted yarn formed by imparting twist to a dissimilar resin fiber different from the bio-nylon having a fineness of 900 to 1800 denier.
• the twist between the primarily twisted yarns and/or the degree of twist between the primarily twisted yarns affects the physical properties of the cord. Specifically, when the twist number of the primarily twisted yarn is too low, the strength may be increased, but the strength retention rate of the cord decreases due to the characteristics of the tire in which tension and compression are repeated. That is, the lower the number of twists, the lower the strength retention rate after fatigue. On the other hand, when the twist number of the primarily twisted yarn is high, the modulus of the cord is lowered and the elongation is higher, so that the strength retention rate after fatigue against tension/compression can be increased.
• the number of twists of each primarily twisted yarn and the number of twists between the primarily twisted yarns can be adjusted.
• the twist number (first twist number) of the first primarily twisted yarn including the bio-nylon may be 250 to 600 TPM. More specifically, the twist number of the bio-based nylon primarily twisted yarn may be 260 TPM or more, 270 TPM or more, 280 TPM or more, 290 TPM or more, 300 TPM or more, 310 TPM or more, 320 TPM or more, 330 TPM or more, 340 TPM or more, 350 TPM or more, 360 TPM or more, 370 TPM or more, 380 TPM or more, 390 TPM or more, 400 TPM or more, 410 TPM or more, 420 TPM or more, 430 TPM or more, 440 TPM or more, 450 TPM or more, 460 TPM or more, 470 TPM or more, 480 TPM or more, 490 TPM or more, 500 TPM or more, 510 TPM or more, 520 TPM or more, 530 TPM or more, 540 TPM or more, 550 TPM or more
• the upper limit of the twist number may be, for example, 590 TPM or less, 580 TPM or less, 570 TPM or less, 560 TPM or less, 550 TPM or less, 540 TPM or less, 530 TPM or less, 520 TPM or less, 510 TPM or less, 500 TPM or less, 490 TPM or less, 480 TPM or less, 470 TPM or less, 460 TPM or less, 450 TPM or less, 440 TPM or less, 430 TPM or less, 420 TPM or less, 410 TPM or less, 400 TPM or less, 390 TPM or less, 380 TPM or less, 370 TPM or less, 360 TPM or less, 350 TPM or less, 340 TPM or less, 330 TPM or less, 320 TPM or less, 310 TPM or less, 300 TPM or less, 290 TPM or less, 280 TPM or less, 270 TPM or less, or 260 TPM or less.
• the number of twists of the second primarily twisted yarn may be appropriately adjusted considering the physical properties of the cord generated through ply-twisting of the first primarily twisted yarn (formed from bio-based nylon fibers and having the same twist number as above).
• the number of twists of the second primarily twisted yarn may be in the range of 250 to 600 TPM.
• the twist number (second twist number) imparted to the resin fiber different from the bio-nylon for forming the second primarily twisted yarn may be 260 TPM or more, 270 TPM or more, 280 TPM or more, 290 TPM or more, 300 TPM or more, 310 TPM or more, 320 TPM or more, 330 TPM or more, 340 TPM or more, 350 TPM or more, 360 TPM or more, 370 TPM or more, 380 TPM or more, 390 TPM or more, 400 TPM or more, 410 TPM or more, 420 TPM or more, 430 TPM or more, 440 TPM or more, 450 TPM or more, 460 TPM or more, 470 TPM or more, 480 TPM or more, 490 TPM or more, 500 TPM or more, 510 TPM or more, 520 TPM or more,
• the upper limit of the twist number may be, for example, 590 TPM or less, 580 TPM or less, 570 TPM or less, 560 TPM or less, 550 TPM or less, 540 TPM or less, 530 TPM or less, 520 TPM or less, 510 TPM or less, 500 TPM or less, 490 TPM or less, 480 TPM or less, 470 TPM or less, 460 TPM or less, 450 TPM or less, 440 TPM or less, 430 TPM or less, 420 TPM or less, 410 TPM or less, 400 TPM or less, 390 TPM or less, 380 TPM or less, 370 TPM or less, 360 TPM or less, 350 TPM or less, 340 TPM or less, 330 TPM or less, 320 TPM or less, 310 TPM or less, 300 TPM or less, 290 TPM or less, 280 TPM or less, 270 TPM or less, or 260 TPM or less.
• the twist number of the bio-nylon primarily twisted yarn (the first twist number) and the twist number of the second primarily twisted yarn (the second twist number) may be the same or different.
• a CC twist machine Cable Corder Twist machine
• a ring twister can be used, wherein the number of twists for each primarily twisted yarn being the same means that the number of twists for each primarily twisted yarn is set to be the same when using the device.
• a difference in the number of twists may occur within about 15%, within 10%, or within 5% of the set value.
• the hybrid raw cord can be formed by secondary twisting the first primarily twisted yarn and the second primarily twisted yarn within a range of 250 to 600 TPM.
• the twist number may be 260 TPM or more, 270 TPM or more, 280 TPM or more, 290 TPM or more, 300 TPM or more, 310 TPM or more, 320 TPM or more, 330 TPM or more, 340 TPM or more, 350 TPM or more, 360 TPM or more, 370 TPM or more, 380 TPM or more, 390 TPM or more, 400 TPM or more, 410 TPM or more, 420 TPM or more, 430 TPM or more, 440 TPM or more, 450 TPM or more, 460 TPM or more, 470 TPM or more, 480 TPM or more, 490 TPM or more, 500 TPM or more,
• the upper limit thereof may be, for example, 590 TPM or less, 580 TPM or less, 570 TPM or less, 560 TPM or less, 550 TPM or less, 540 TPM or less, 530 TPM or less, 520 TPM or less, 510 TPM or less, 500 TPM or less, 490 TPM or less, 480 TPM or less, 470 TPM or less, 460 TPM or less, 450 TPM or less, 440 TPM or less, 430 TPM or less, 420 TPM or less, 410 TPM or less, 400 TPM or less, 390 TPM or less, 380 TPM or less, 370 TPM or less, 360 TPM or less, 350 TPM or less, 340 TPM or less, 330 TPM or less, 320 TPM or less, 310 TPM or less, 300 TPM or less, 290 TPM or less, 280 TPM or less, 270 TPM or less, or 260 TPM or less.
• the number of twists of the first and second primarily twisted yarns i.e., the number of twists at the primary twisting
• the number of twists at the secondary twisting may be the same or different.
• the number of twists at the time of primary twisting and the number of twists at the time of secondary twisting may be set to be the same.
• the number of twists at the time of primary twisting and the number of twists at the time of secondary twisting may be slightly different in the final product. Specifically, in the case of a CC twist machine (Cable Corder Twist machine) used in the preparation of the cord, it is driven by one motor.
• CC twist machine Consumer Corder Twist machine
• the yarn in the creel passes through the disk connected to the motor and is connected to a regulator (a section where the primarily twisted yarn and primarily twisted yarn meet to perform secondary twisting).
• the yarn at the port passes through a tension adjusting guide roll and is connected to a regulator.
• the regulator to which the yarn coming out of the disk is connected is also rotated.
• the primary twisting is applied to the creel part yarn and the port part yarn connected by the rotation of the motor.
• the primarily twisted yarns are secondarily twisted together. In this manner, the raw cord is prepared while a twisting occurs due to the rotational motion of the motor.
• Even when the twist numbers of the primary twisting and the secondary twisting are imparted (set) to be the same, the twist numbers of the primary twisting and the secondary twisting may be different due to friction generated by the winding tension or guide rollers.
• the number of twists of the primarily twisted yarn and/or the number of twists between the primarily twisted yarns are controlled within the above range, it may be advantageous to secure physical properties having commercially required levels (i.e., physical properties of levels the cord including a conventional chemical-based nylon primarily twisted yarn has) in relation to properties such as strength, constant load elongation, elongation at break, dry heat shrinkage, adhesive strength, and/or fatigue resistance.
• the cord includes a first primarily twisted yarn and a second primarily twisted yarn having a predetermined number of twists, and is formed by twisting the first primarily twisted yarn and the second primarily twisted yarn together.
• the filament for forming the first primarily twisted yarn and the filament for forming the second primarily twisted yarn are simultaneously primarily twisted by a CC twist machine (e.g., cable corder twist machine) or a ring twister, thereby forming a first primarily twisted yarn and a second primarily twisted yarn. Therefore, a twisting direction (first twisting direction) of the first primarily twisted yarn may be the same as a twisting direction (second twisting direction) of the second primarily twisted yarn.
• the secondary twisting can be performed continuously at the same time as the primary twisting, wherein the twisting direction of the secondary twisting (i.e., third twisting direction) may be opposite to the first twisting direction (or second twisting direction).
• a CC twist machine e.g., cable corder twist machine
• a ring twister e.g., a ring twister
• the content of the primarily twisted yarn in the cord affects the characteristics of the cord. For example, when the content of aramid is high, the high-speed driving performance of the tire can be improved due to the high modulus, but fatigue performance is lowered because it receives a lot of load for the same deformation. Further, when the content of nylon is large, the modulus of the initial part of the stress-strain curve pattern indicating the physical properties of the cord is low, and thus the fatigue resistance performance is increased by receiving less load for the same deformation, but the overall power to support the tires is insufficient, and the effect on driving performance is low. In the present application, the content of the primarily twisted yarn can be adjusted in consideration of the above points.
• the hybrid raw cord may include 20 to 50 % by weight of the first primarily twisted yarn relative to 100% by weight of the total weight of the raw cord.
• the lower limit of the content of the first primarily twisted yarn may be, for example, 20% by weight or more, specifically 25% by weight or more, or 30% by weight or more, more specifically 31 % by weight or more, 32 % by weight or more, 33 % by weight or more, 34 % by weight or more, 35 % by weight or more, 36 % by weight or more, 37 % by weight or more, 38 % by weight or more, 39 % by weight or more, 40 % by weight or more, 41 % by weight or more, 42 % by weight or more, 43 % by weight or more, 44 % by weight or more or 45 % by weight or more.
• the upper limit thereof may be, for example, 50 % by weight or less, specifically 49 % by weight or less, 48 % by weight or less, 47 % by weight or less, 46 % by weight or less, 45 % by weight or less, 44 % by weight or less, 43 % by weight or less, 42 % by weight or less, 41 % by weight or less or 40 % by weight or less.
• the content of the remaining primarily twisted yarn (second primarily twisted yarn, etc.) that is secondarily twisted together with the first primarily twisted yarn can be appropriately adjusted at a level that does not impair the above-mentioned described purposes of the present application.
• the content of the second primarily twisted yarn in the raw cord may be the content excluding the content of the first primarily twisted yarn described above, that is, 50 to 80% by weight.
• a more specific content of the second primarily twisted yarn can be determined depending on the above-described content of the first primarily twisted yarn.
• the type of the dissimilar resin fiber used for forming the second primarily twisted yarn may be selected from a level that does not impair the purpose of the present application.
• the second primarily twisted yarn may include at least one of polyester fibers, aromatic polyamide fibers, and polyketone fibers.
• the second primarily twisted yarn may include aramid fibers. That is, the second primarily twisted yarn may be formed by imparting twist to the aramid fiber, and the hybrid cord of the present application may include a nylon primarily twisted yarn (first primarily twisted yarn) and an aramid primarily twisted yarn (second primarily twisted yarn).
• Aramid showing a high modulus has little change in modulus at room temperature and high temperature, and thus, it is excellent in suppressing a flat spot phenomenon where the tire deforms when parked for a long period of time, and is an advantageous material for providing high-quality tires.
• the cord may be a two-ply or three-ply cord.
• the cord may have a two-ply structure in which one strand of the first primarily twisted yarn having the above-mentioned fineness and one strand of the second primarily twisted yarn having the above-mentioned fineness are secondarily twisted together.
• the cord may have a three-ply structure in which one strand of the first primarily twisted yarn having the above-mentioned fineness and two strands of the second primarily twisted yarns having the above-described fineness are secondarily twisted together.
• the cord may be one in which the fineness and/or the number of twists of each of the primarily twisted yarns are specified.
• the first primarily twisted yarn is formed by imparting twist to a bio-nylon fiber having a fineness of 750 to 1100 denier
• the second primarily twisted yarn may be formed by imparting twist to a dissimilar resin fiber different from the bio-nylon having a fineness of 900 to 1200 denier.
• the number of twists of the first primarily twisted yarn may be, for example, 300 TPM or more, and the upper limit thereof can be adjusted within the above-mentioned range.
• the specific fineness can also be adjusted within the above-mentioned range.
• the first primarily twisted yarn is formed by imparting twist to a bio-nylon fiber having a fineness of 1100 to 1500 denier
• the second primarily twisted yarn may be formed by imparting twist to a dissimilar resin fiber different from the bio-nylon having a fineness of 1200 to 1800 denier.
• the number of twists of the first primarily twisted yarn may be, for example, 400 TPM or less, and the upper limit can be adjusted within the above-mentioned range.
• the specific fineness can also be adjusted within the above-mentioned range.
• the length ratio of the second primarily twisted yarn to the first primarily twisted yarn may be in the range of 1.0 to 1.10 times.
• the length ratio of the second primarily twisted yarn to the first primarily twisted yarn is measured after untwisting the secondary twisting for the plied twisted yarns (raw cord or dipped cord). This is for making the second primarily twisted yarn (aramid primarily twisted yarn) having a higher modulus longer to lower the initial modulus of the cord, and thus improving the fatigue performance of the cord.
• the ratio of the length of the second primarily twisted yarn to the first primarily twisted yarn (the length of the second primarily twisted yarn (L 2 )/the length of the first primarily twisted yarn (L 1 )) is less than 1.0, the aramid with high modulus becomes shorter, and the modulus of the initial part becomes higher in the stress-strain curve pattern indicating the tensile properties of the cord, so that the cord receives more load in the same deformation, and ultimately the fatigue resistance performance is lowered.
• the lower limit of the ratio may be, for example, 1.01 or more, 1.02 or more, 1.03 or more, 1.04 or more, or 1.05 or more
• the upper limit thereof may be, for example, 1.09 or less, 1.08 or less, 1.07 or less, 1.06 or less, or 1.05 or less.
• the length ratio control as described above can be achieved by adjusting the amount of tensi on applied to each of the filaments forming the first primarily twisted yarn and the filaments forming the second primarily twisted yarn, during the primary twisting and/or secondary twisting process for preparing the cord. More specifically, when the primary twisting and secondary twisting are performed, the magnitude of the tension applied to the aramid fiber (forming the second primarily twisted yarn) is made smaller than the tension applied to the bio-nylon fiber forming the first primarily twisted yarn, so that the length of the second primarily twisted yarn can be made longer than the length of the first primarily twisted yarn.
• the coating layer formed on the raw cord means a layer formed from a coating solution capable of exhibiting a predetermined function. Such a coating layer may be formed on at least a portion of the above-mentioned primarily twisted yarn.
• the method of forming the coating layer is not particularly limited, and for example, the coating layer can be formed through a known dipping or spraying method.
• the coating layer may be configured to impart predetermined characteristics to the cord or to reinforce the characteristics of the cord.
• the coating layer may be a layer capable of imparting an adhesive function to the cord, but the characteri sti cs imparted or reinforced by the coating layer are not limited only to the adhesive function.
• the coating layer may be formed from an adhesive (composition).
• the coating layer may include or be formed from a resorcinol formaldehyde latex (RFL) adhesive (composition), an epoxy adhesive (composition), or a urethane adhesive (composition).
• RTL resorcinol formaldehyde latex
• the adhesive component forming the coating layer is not limited to those described above.
• the adhesive composition may include an aqueous or non-aqueous solvent. This adhesive allows the fiber cord to exhibit improved adhesion to other adjacent constructions in tire reinforcement applications.
• the hybrid cord having the configuration as above can provide physical properties having commercially required level (i.e., physical properties of levels the cord including a conventional chemical-based nylon primarily twisted yarn has). Such physical properties include, for example, strength, constant load elongation, elongation at break, dry heat shrinkage, adhesive strength, and fatigue resistance.
• physical properties include, for example, strength, constant load elongation, elongation at break, dry heat shrinkage, adhesive strength, and fatigue resistance.
• the hybrid cord of the present application is constructed and prepared so as to complement the high modulus properties of the bio-nylon primarily twi sted yarn, it is possible to prevent deterioration of the expected cord elongation and fatigue resistance by using a bio-nylon primarily twisted yarn having a high modulus.
• the strength of the hybrid cord may be 20 kgf or more. Specifically, the strength may be, for example, 21 kgf or more, 22 kgf or more, 23 kgf or more, 24 kgf or more, or 25 kgf or more.
• the strength is a level similar to the strength that a cord including a conventional chemical-based nylon primarily twisted yarn has. The strength can be measured according to a method described later.
• the constant load elongation (%, @4.5 kg) of the hybrid cord may be 2.8% or more.
• the constant load elongation may be 2.9 % or more, 3.0 % or more, 3.1 % or more, 3.2 % or more, 3.3 % or more, 3.4% or more, 3.5 % or more, 3.6% or more, 3.7 % or more, 3.8 % or more, 3.9 % or more, 4.0 % or more, 4.1 % or more, 4.2 % or more, 4.3 % or more, 4.4 % or more, 4.5 % or more, 4.6 % or more, 4.7 % or more, 4.8 % or more, 4.9 % or more or 5.0 % or more.
• the corresponding constant load elongation is a level equivalent to or higher than the constant load elongation possessed by the cord including a conventional chemical-based nylon primarily twisted yarn.
• the constant load elongation can be measured according to a method
• the constant load elongation may be adjusted or changed according to the number of twists. For example, when the number of twists in the cord is low, the modulus is exhibited highly during the tensile test, which causes a reduction of the constant load elongation. Having high modulus when the number of twists is low is caused by the structural characteristics of the cord. This is because the lower the number of twists in the cord length direction, the more diagonal lines due to the twist are erected in the cord length direction, and the maximum force is received faster, thereby increasing the overall modulus.
• the elongation at break (%) of the hybrid cord may be 7.0% or more.
• the elongation at break may be 7.1 % or more, 7.2 % or more, 7.3 % or more, 7.4 % or more, 7.5 % or more, 7.6 % or more, 7.7 % or more, 7.8 % or more, 7.9 % or more, 8.0% or more, 8.1 % or more, 8.2 % or more, 8.3 % or more, 8.4 % or more, 8.5 % or more, 8.6 % or more, 8.7 % or more, 8.8 % or more, 8.9 % or more, 9.0 % or more, 9.1 % or more, 9.2 % or more, 9.3 % or more, 9.4 % or more, 9.5 % or more, 9.6 % or more, 9.7 % or more, 9.8 % or more, 9.9 % or more or 10% or more.
• the elongation at break is 7.1 % or more,
• the elongation at break can be adjusted or changed according to the number of twists. For example, the higher the twist, the lower the modulus, whereby the S-S curve pattern (stress-strain curve pattern) is more inclined, and consequently may show that the elongation at break is higher.
• the dry heat shrinkage rate of the hybrid cord may be 1.2% or more.
• the dry heat shrinkage rate may be 1.3% or more, 1.4% or more, 1.5% or more, 1.6% or more, 1.7% or more, 1.8% or more, 1.9% or more, or 2.0% or more.
• the dry heat shrinkage rate is a level similar to the dry heat shrinkage rate of a cord including a conventional chemical-based nylon primarily twisted yarn. The dry heat shrinkage rate can be measured according to a method described later.
• the adhesive strength of the hybrid cord may be 12.5 kgf or more.
• the adhesive strength may be 12.6 kgf or more, 12.7 kgf or more, 12.8 kgf or more, 12.9 kgf or more, 13.0 kgf or more, 13.1 kgf or more, 13.2 kgf or more, 13.3 kgf or more, 13.4 kgf or more, 13.5 kgf or more, 13.6 kgf or more, 13.7 kgf or more, 13.8 kgf or more, 13.9 kgf or more, or 14.0 kgf or more.
• the adhesive strength is a level similar to the adhesive strength possessed by the cord including a conventional chemical-based nylon primarily twisted yarn. The adhesive strength can be measured according to a method described later.
• the strength retention rate after 8-hour fatigue of the hybrid cord may be 90% or more.
• the strength retention rate after 8-hour fatigue may be 90.5% or more, 91.0% or more, 91.5% or more, 92.0% or more, 92.5% or more, or 93.0% or more.
• the strength retention rate after 8-hour fatigue as described above is a level equivalent to or higher than the strength retention ratio after 8-hour fatigue of a cord including a conventional chemical-based nylon primarily twisted yarn.
• the strength retention rate after 8-hour fatigue can be measured according to a method described later.
• the strength retention rate after 16-hour fatigue of the hybrid cord may be 70% or more.
• the strength retention rate after 16-hour fatigue may be 70.5 % or more, 71.0 % or more, 71.5 % or more, 72.0 % or more, 72.5 % or more, 73.0 % or more, 73.5 % or more, 74.0 % or more, 74.5 % or more, 75.0 % or more, 75.5 % or more, 76.0 % or more, 76.5 % or more, 77.0 % or more, 77.5 % or more, 78.0 % or more, 78.5 % or more, 79.0 % or more, 79.5 % or more or 80.0 % or more.
• the strength retention rate after 16-hour fatigue as described above is a level equivalent to or higher than the strength retention rate after 16 hour-fatigue of a cord including a conventional chemical-based nylon primarily twisted yarn.
• the strength retention rate after 16-hour fatigue can be measured according to a method described later.
• the characteristics of the hybrid cord may differ depending on the configuration of the cord.
• the first primarily twisted yarn is formed by imparting twist to a bio-nylon fiber having a fineness of 750 to 1100 denier
• the second primarily twisted yarn is formed by imparting twist to a dissimilar resin fiber different from the bio-nylon having a fineness of 900 to 1200 denier
• the plied twisted yarn in which the number of twists of the first primarily twisted yarn is, for example, 350 TPM or more and 400 TPM or less can be used.
• the constant load elongation of the cord may be, for example, 3.8 % or more, 3.9 % or more, 4.0 % or more, 4.1 % or more, 4.2 % or more, 4.3 % or more, 4.4 % or more, 4.5 % or more, 4.6 % or more, 4.7 % or more, 4.8 % or more, 4.9 % or more or 5.0 % or more.
• the elongation at break of the cord may be, for example, 8.5 % or more, 8.6 % or more, 8.7 % or more, 8.8 % or more, 8.9 % or more, 9.0 % or more, 9.1 % or more, 9.2 % or more, 9.3 % or more, 9.4 % or more, 9.5 % or more, 9.6 % or more, 9.7 % or more, 9.8 % or more, 9.9 % or more or 10 % or more.
• the strength retention rate after 8-hour fatigue may be 91.0 % or more, 91.5 % or more, 92.0 % or more, 92.5 % or more or 93.0 % or more
• the strength retention rate after 16-hour fatigue may be 75.0 % or more, 75.5 % or more, 76.0 % or more, 76.5 % or more, 77.0 % or more, 77.5 % or more, 78.0 % or more, 78.5 % or more, 79.0 % or more, 79.5 % or more or 80.0 % or more.
• the first primarily twisted yarn is formed by imparting twist to a bio-nylon fiber having a fineness of 750 to 1100 denier
• the second primarily twisted yarn is formed by imparting twist to a resin fiber different from a bio nylon having a fineness of 900 to 1200 denier
• the plied twisted yarn in which the number of twists of the first primarily twisted yarn may be, for example, 300 TPM or more and less than 350 TPM can be used.
• the constant load elongation of the cord may be, for example, 2.8 % or more, 2.9 % or more, 3.0 % or more, 3.1 % or more, 3.2 % or more, 3.3 % or more, 3.4 % or more, 3.5 % or more, 3.6 % or more, 3.7 % or more, 3.8 % or more, 3.9 % or more or 4.0 % or more.
• the elongation at break of the cord may be, for example, 7.0% or more, 7.1% or more, 7.2% or more, 7.3% or more, 7.4% or more, 7.5% or more, 7.6% or more, 7.7% or more, 7.8% or more, 7.9% or more, 8.0% or more, 8.1% or more, 8.2% or more, 8.3% or more, 8.4% or more, 8.5% or more, 8.6% or more, 8.7% or more, 8.8% or more, 8.9% or more, or 9.0% or more.
• the strength retention rate after 8 hour-fatigue may be 90% or more, 90.5% or more, or 91.0% or more
• the strength retention rate after 16 hour-fatigue may be 70% or more, 70.5% or more, 71.0% or more, 71.5% or more, 72.0% or more, 72.5% or more, 73.0% or more, 73.5% or more, 74.0% or more, 74.5% or more, or 75.0% or more.
• the method may be a method for preparing the above-mentioned cord.
• heat setting can be performed so that the molecular chains are well oriented in the fiber length direction.
• the heat-set fiber receives a temperature above the glass transition temperature, it returns to its original curly shape, but in this case, the modulus is lowered.
• the molecular chain returns to its original shape and the modulus is lowered.
• the molecular chains are maintained in an oriented state or are further oriented, thereby increasing the modulus.
• the inventors of the present application controlled the tension applied to the plied twisted yarn having the above structure to a predetermined range at the time of forming the coating layer in consideration of the heat characteristics of the fiber and the dip cord preparation process described above.
• the method includes a step of preparing a plied twisted yarn (or plied yarn) in which a first primarily twisted yarn formed by imparting twist to a bio-nylon fiber having a fineness of 600 to 2000 denier and a second primarily twisted yarn formed by imparting twist to a dissimilar resin fiber different from the bio-nylon having a fineness of 800 to 2200 denier are secondarily twisted together, and a step of forming a coating layer on the plied twisted yarn while applying a tension to the plied twisted yarn.
• a tension applied to the plied twisted yarn is 1.0 kg/cord or less.
• a twist number imparted to the first primarily twisted yarn is in the range of 250 to 600 TPM
• the hybrid raw cord includes the first primarily twisted yarn in an amount of 20 to 50% by weight relative to 100% by weight of the total weight.
• the hybrid cord prepared according to the above method satisfies a strength retention rate of 90% or more after an 8-hour disk fatigue test performed according to JIS-L 1017 method of Japanese Standard Association (JSA).
• the tension applied to the plied twisted yarn may be 0.1 kg/cord or more, 0.2 kg/cord or more, 0.3 kg/cord or more, 0.4 kg/cord or more, 0.5 kg/cord or more, 0.6 kg/cord or more, 0.7 kg/cord or more, 0.8 kg/cord or more or 0.9 kg/cord or more.
• the upper limit thereof may be, for example, 0.9 kg/cord or less, 0.8 kg/cord or less, 0.7 kg/cord or less, 0.6 kg/cord or less, 0.5 kg/cord or less, 0.4 kg/cord or less, 0.3 kg/cord or less or 0.2 kg/cord or less.
• the method includes a step of forming a coating layer on the plied twisted yarn while applying tension to the plied twisted yarn (raw cord) including the bio-based nylon primarily twisted yarn.
• the 'forming a coating layer' may mean that the coating composition (coating solution) is applied onto the raw cord.
• the applied coating composition may be subjected to heat treatment such as drying or curing described later.
• the coating layer may mean a layer obtained through heat treatment.
• the method of applying the coating composition (coating solution) onto the raw cord is not particularly limited, and for example, dipping or spraying can be used.
• the method may include spraying a coating layer forming composition (coating solution) on the plied-twisted yarn (raw cord). That is, in the method, the coating layer can be formed by spraying the coating layer forming composition (coating solution) onto the plied twisted yarn.
• the method may include a step of dipping the plied twisted yarn (raw cord) in the coating layer forming composition (coating solution). That is, in the method, the coating layer can be formed by dipping the plied twisted yarn in the coating layer forming composition (coating solution).
• a specific method of dipping the plied twisted yarn into the coating composition is not particularly limited.
• a method can be used in which the plied twisted yarn is dipped in a coating bath filled with the coating composition while transferring the plied twisted yarn or a fiber base including the same using a roll can be used.
• the cord coated with the coating composition after dipping may be referred to as a dip cord.
• the forming the coating layer may be performed through transferring the cord, applying (spraying or dipping) a coating composition to the cord and/or subjecting to a subsequent heat treatment.
• the step (process) of forming the coating layer while applying tension may include one or more steps of transferring the cord, dipping (or spraying) and heat treatment.
• the step (process) of forming a coating layer performed while applying tension may include heat-treating the plied twisted yarn to which the coating composition has already been applied while applying a tension of the above-mentioned size thereto; (while applying a tension of the above size) applying the coating composition to the plied twisted yarn and heat treating; or (while applying a tension of the above size) transferring the plied twisted yarn, applying the coating composition, and performing heat treatment.
• the heat treatment may be performed at a temperature within a predetermined range.
• the heat treatment may be performed at a temperature of 50°C or more, specifically, at a temperature in the range of 60 to 350°C.
• the heat treatment can be performed for 10 to 300 seconds.
• the method may include two times or more of heat treatment steps. Specifically, the method includes a first heat treatment step performed at a temperature of 60 to 220°C; and a second heat treatment step performed at a temperature of 200 to 350°C.
• the time period during which the heat treatment is performed is not particularly limited, but, for example, each of these heat treatments may be performed for about 10 to 300 seconds.
• the temperature at which the first heat treatment is performed may be lower than the temperature at which the second heat treatment is performed.
• the first heat treatment temperature may be in the range of 70 to 180°C
• the second heat treatment temperature may be in the range of 200 to 300 °C.
• the first heat treatment performed at a relatively low temperature may be referred to as a drying process
• the second heat treatment performed at a relatively high temperature may be referred to as a curing process.
• the step (process) of forming a coating layer performed while applying the tension may be used in a sense including heat-treating the plied twisted yarn to which the coating composition has been applied while applying a tension of the above-described size. More specifically, the step (process) of forming a coating layer performed while applying the tension can be used as the meaning of performing a second heat treatment while applying a tension of the above-mentioned magnitude to the ply-twisted yarn performed up to the first heat treatment after the coating composition is applied. Because high-temperature heat treatment, especially the second heat treatment, greatly affects the final physical properties of the cord, it is important to satisfy the above-mentioned tension range.
• the tension in the above-mentioned range can be maintained during at least the heat treatment, more specifically the second heat treatment, and, in this case, the tension applied to the transfer, dipping (or spray) for forming the coating layer and the first heat treatment may be the same to or different (slightly changed) from the above-mentioned tension range.
• the dipping or spraying may be performed one or more times.
• the components of the coating composition used for each dipping or spraying may be the same or different.
• the first dipping, the second dipping, and the heat treatment may be sequentially performed.
• the heat treatment may sequentially include a first heat treatment (e.g., drying) and/or a second heat treatment (e.g., curing).
• first dipping, heat treatment, second dipping and heat treatment may be sequentially performed.
• the heat treatment performed between the first dipping and the second dipping may be a drying process performed at a relatively low temperature
• the heat treatment performed after the second dipping may be a curing process performed at a relatively high temperature.
• the method may be a method in which a bio-based nylon fiber (filament) is primarily twisted in a first twisting direction to produce a first primarily twisted yarn, and at the same time, a dissimilar fiber (filament) is primarily twisted in a second twisting direction to produce a second primarily twisted yarn.
• a bio-based nylon fiber filament
• a dissimilar fiber filament
• the method may be a method of preparing a plied twisted yarn by twisting the first and second primarily twisted yarns in a third twisting direction after or simultaneously with the preparation of the primarily twisted yarn as described above.
• the first twisting direction and the second twisting direction may be the same, and the first twisting direction and the third twisting direction may be different from each other.
• a twisting machine that simultaneously performs primary twisting and secondary twisting such as a cable corder, may be used in the preparation of a plied twisted yarn.
• a twisting direction of the first primarily twisted yarn may be the same as a twisting direction of the second primarily twisted yarn (second twisting direction).
• the secondary twisting can be continuously performed at the same time as the primary twisting.
• the twisting direction of the seccodarily twisting i.e., the third twisting direction
• the method may be a method of forming the second primarily twisted yarn by imparting a twist number within the range of 250 to 600 TPM to the fibers (filaments) forming the second primarily twisted yarn. That is, the number of twists imparted to the second primarily twisted yarn is in the range of 250 to 600 TPM.
• the method may include secondarily twisting the first primarily twisted yarn and the second primarily twisted yarn with a twist number within a range of 250 to 600 TPM to form a plied twisted yarn.
• the method may include imparting twist to a bio-nylon fiber having a fineness of 750 to 1100 denier to form a first primarily twisted yarn, and imparting twist to a dissimilar resin fiber different from the bio-nylon having a fineness of 900 to 1200 denier to form a second primarily twisted yarn.
• the number of twists imparted to the first primarily twisted yarn may be 300 TPM or more, and the upper limit can be adjusted within the above-mentioned range.
• the specific fineness can also be adjusted within the above-mentioned range.
• the method may include imparting twist to a bio-nylon fiber having a fineness of 1100 to 1500 denier to form the first primarily twisted yarn, and imparting twist to a dissimilar resin fiber different from the bio-nylon having a fineness of 1200 to 1800 denier to form a second primarily twisted yarn.
• the number of twists of the first primarily twisted yarn may be, for example, 400 TPM or less, and the upper limit can be adjusted within the above-mentioned range.
• the specific fineness can also be adjusted within the above-mentioned range.
• the second primarily twisted yarn used together with the bio-nylon primarily twisted yarn which is the first primarily twisted yarn may include aramid fibers.
• the method may be a method of controlling the magnitude of the tension applied to the aramid fiber (forming a second primarily twisted yarn) to be smaller than the tension applied to the bio-nylon fiber (forming a first primarily twisted yarn) when the primary twisting and/or secondary twisting are performed.
• the length ratio of the second primarily twisted yarn to the first primarily twisted yarn (length of the second primarily twisted yarn (L 2 )/the length of the first primarily twisted yarn (L 1 )) measured after the secondary twisting is untwisted with respect to the plied twisted yarn (raw cord or dipped cord) can be adjusted in the range of 1.0 to 1.10 times.
• the plied twisted yarn (raw cord) formed including the bio-based nylon primarily twisted yarn has poor physical property balance due to the characteristics of the bio-based nylon yarn with a low constant load elongation (i.e., high modulus) (e.g., strength properties after fatigue are not good).
• the method of the present application for controlling the properties of the fibers e.g., the type of fibers, the number of twists, fineness, content, etc.
• the tension when forming the coating layer within a predetermined range can provide elongation characteristics and a strong retention rate after fatigue having the level equivalent to or higher than a conventional cord including a chemical-based nylon primarily twisted yarn, while using a bio-based nylon primarily twisted yarn having a high modulus.
• a rubber composite or rubber reinforcing material including the cord.
• the rubber composite or the rubber reinforcing material may further include a rubber substrate such as a rubber sheet in addition to the above-mentioned cord.
• a tire including the cord may have a generally known configuration such as a tread, shoulder, sidewall, cap ply, belt, carcass (or body ply), inner liner, bead, and the like.
• a hybrid cord that includes a bio-based nylon primarily twisted yarn, and meets the commercially required level of physical properties in terms of strength, constant load elongation, elongation at break, dry heat shrinkage, adhesive strength, and/or fatigue resistance.
• the present application has the inventive effect of providing a hybrid cord having elongation and fatigue resistance properties equivalent to or higher than commercially required levels (i.e., the level that the cord containing a conventional chemical-based nylon primarily twisted yarn has), while including a primarily twisted yarn including bio-based nylon having a higher modulus compared to chemical-based nylon.
• Bio-based Nylon has lower constant load elongation (i.e., higher modulus) and lower elongation at break than Chemical Nylon, on the premise of having a similar fineness. Due to the characteristics of other yarns, it is also confirmed that the dry heat shrinkage rate of Bio-based Nylon is generally higher than that of Chemical Nylon.
• An aramid filament yarn with about 1000 deniers and a Bio-based Nylon (PA 56) filament yarn with about 840 deniers were put into a cable corder (Allma), and primary twisting in Z-direction and secondary twisting in S-direction were respectively performed at the same time to prepare a 2-ply cabled yarn (raw cord).
• the raw cord prepared as above contains about 45.7 wt% of the first primarily twisted yarn (including bio-nylon fiber) and about 54.3 wt% of the second primarily twisted yarn (including aramid fiber).
• the plied twisted yarn (raw cord) was dipped into a resorcinol-formaldehyde-latex (RFL) adhesive solution containing 2.0 wt% resorcinol, 3.2 wt% formalin (37%), 1.1 wt% sodium hydroxide (10%), 43.9 wt% styrene/butadiene/vinylpyridine (15/70/15) rubber (41%) and water.
• RFL resorcinol-formaldehyde-latex
• a hybrid cord was prepared in the same manner as in Example 1, except that the tension applied to the plied twisted yarn during coating was set to 0.3 kg/cord.
• a hybrid cord was prepared in the same manner as in Example 1, except that Chemical Nylon (PA 66) with 840 deniers was used instead of Bio-Based Nylon with 840 deniers, and the tension applied to the plied twisted yarn during coating was set to 0.8 kg.
• Chemical Nylon (PA 66) with 840 deniers was used instead of Bio-Based Nylon with 840 deniers, and the tension applied to the plied twisted yarn during coating was set to 0.8 kg.
• a hybrid cord was prepared in the same manner as in Example 1, except that the tension applied to the plied twisted yarn during coating was set to 1.5 kg/cord.
• a hybrid cord was prepared in the same manner as in Example 1, except that the tension applied to the plied twisted yarn during coating was set to 1.1 kg/cord.
• the strength (kgf) before fatigue and the strength (kgf) after fatigue were determined by measuring the strength at break of the hybrid tire cord while applying a tensile speed of 300 m/min to a sample of 250 mm using an Instron testing machine (Instron Engineering Corp., Canton, Mass).
• a hybrid cord was prepared in the same manner as in Example 1, except that the number of twists was set to 33 5 TPM when preparing the plied twisted yarn, and the tension applied to the plied twisted yarn during coating was set to 1.0 kg/cord.
• a hybrid cord was prepared in the same manner as in Example 3, except that the tension applied to the plied twisted yarn during coating was set to 0.8 kg/cord.
• a hybrid cord was prepared in the same manner as in Example 3, except that Chemical Nylon (PA 66) with 840 denier was used instead of Bio-Based Nylon with 840 denier and the tension applied to the plied twisted yarn during coating was set to 1.2 kg.
• Chemical Nylon (PA 66) with 840 denier was used instead of Bio-Based Nylon with 840 denier and the tension applied to the plied twisted yarn during coating was set to 1.2 kg.
• a hybrid cord was prepared in the same manner as in Example 3, except that the tension applied to the plied twisted yarn during coating was set to 2.0 kg/cord.
• a hybrid cord was prepared in the same manner as in Example 3, except that the tension applied to the plied twisted yarn during coating was set to 1.5 kg/cord.
• Example 3 The physical property evaluation results of the cords prepared in Examples 3-4, Reference Example 2 and Comparative Example 3-4 are shown in Table 3 below.
• the physical property evaluation method described in Table 3 is the same as described above.
• Example 3 Example 4 Reference Example 1 Comparativ e Example 1 Comparativ e Example 2 Type of Nylon primarily twisted yarn PA 56 PA 56 PA 66 PA 56 PA 56 Twist number (TPM)* 335 335 335 335 335 335 335 335
• TPM Twist number
• Tension under coating (kgf/cord)** 1.0 0.8 1.2 2.0 1.5 Strength (kgf) 25.4 24.8 25.6 25.1 25.5 Constant load elongation @4.5kgf(%) 3.1 3.3 3.1 2.3 2.6 Elongation at break (%) 7.5 7.7 7.7 6.3 6.9 Dry heat shrinkage (%) 1.8 1.6 1.8 2.4 2.0

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Mechanical Engineering (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Organic Insulating Materials (AREA)
• Ropes Or Cables (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=83848290

Family Applications (1)

Country Status (5)

Families Citing this family (1)

Family Cites Families (12)

• 2022
  • 2022-04-27 EP EP22796119.0A patent/EP4276229A4/de active Pending
  • 2022-04-27 US US18/262,551 patent/US20240076810A1/en active Pending
  • 2022-04-27 WO PCT/KR2022/005981 patent/WO2022231286A1/ko active Application Filing
  • 2022-04-27 JP JP2023559720A patent/JP2024511515A/ja active Pending
  • 2022-04-29 TW TW111116335A patent/TWI804297B/zh active

Also Published As

Similar Documents

Legal Events