JP5301249B2 - rope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rope having a suitable elongation and also excellent in tenacity utilization rate. <P>SOLUTION: This rope includes twisted yarns obtained by mixing two or more kinds of fibrous tows, and also a fibrous tow A having a high elongation and a fibrous tow B having a low elongation, of which at least a part satisfies both of the following (1) to (2): (1) (elongation of A)/(elongation of B)=1.25 to 10, and (2) (yarn length of B)/(yarn length of A)=1.015 to 1.150. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a rope having a moderate elongation and a mixed twisted yarn having a high strength utilization factor.

Conventionally, ropes made of spun yarns or synthetic fiber filaments made of natural fibers or synthetic short fibers are often used.
For example, a polyester fiber rope consisting of a composite bulky yarn that has a supple tactile feel with sheath yarn to bring the handling and handling of the rope closer to the spun yarn, and improved the strength utilization rate to achieve high strength has been proposed. (For example, refer to Patent Document 1). However, the rope of Patent Document 1 is still insufficient in strength, and sufficient performance cannot be obtained in terms of fatigue resistance.

On the other hand, high-strength fibers, especially high-strength fibers called super fibers, are used for heavy-weight towing, anchoring on ships, fishing nets, sports equipment nets, elevator lifting ropes, etc. It has been developed for applications where strength can be utilized as a feature. However, although super fibers generally have high strength and elastic modulus but generally have low elongation, there are cases where handling is inconvenient depending on applications.
In addition, the high strength, high elastic modulus, and low elongation fibers described above have a great influence on the physical properties of the entire rope when twisted to produce a rope. There is a problem that it is difficult to select manufacturing conditions, such as a problem in the process passability, and thus productivity is lowered.

  Further, a fiber having a high strength, a high elastic modulus, and a low elongation has a high cost, and a rope composed of the fiber alone is expensive. In order to solve this, a method of manufacturing a rope by mixing twisted tows made of other synthetic fibers has been proposed (for example, see Patent Document 2). Patent Document 2 relates to a rope in which the fiber tow constituting the core has a higher elongation than the fiber tow constituting the side, and the fiber tow constituting the side is a fiber having high strength, high elastic modulus, and low elongation. However, when these fiber tows are mixed and twisted, the tensile strength of the rope itself becomes low because the difference in physical properties between the high strength, high elastic modulus, low elongation fiber and the synthetic fiber is remarkable. It was difficult to increase the strength utilization rate of the entire rope.

JP-A-6-081282 JP 2002-060163 A

  The present invention has been made in view of such problems, and an object of the present invention is to provide a rope having a high utilization factor.

  As a result of intensive studies to solve the above problems, the present inventors have identified a tow composed of high strength, high elastic modulus, low elongation fiber and a tow composed of high elongation fiber. The present inventors completed the present invention by discovering that a rope twisted with an elongation ratio and a yarn length ratio has a high strength utilization factor.

That is, the present invention is a polyarylate fiber composed of a high elongation fiber tow A and a molten liquid crystal polymer, which are composed of a twisted yarn in which two or more kinds of fiber tows are mixed, and at least a part of which satisfies both of the following It is a rope comprised with the low elongation fiber tow B which is.
(1) A elongation / B elongation = 1.25-10,
(2) B yarn length / A yarn length = 1.015 to 1.150.

Further, the present invention is preferably the above-mentioned rope in which the mixing ratio of B is 25 to 85% by mass, and further, B is preferably a molten liquid crystal polymer having a strength of 18 cN / dtex or more and an elastic modulus of 400 cN / dtex or more. It is said rope which is the polyarylate fiber which becomes .

  According to the present invention, it is possible to provide a rope having an appropriate elongation and excellent strength utilization.

  The fiber of the high elongation fiber tow A constituting the rope of the present invention is preferably a synthetic fiber having a relatively high elongation such as polyester, nylon, polypropylene, polyethylene, polyvinyl alcohol, etc. Among these, high strength, From the viewpoint of excellent friction fatigue properties, polyvinyl alcohol fibers are more preferable.

On the other hand, fibers of low elongation fiber tows B constituting the rope of the present invention must be a polyarylate fiber comprising melting a liquid crystal polymer state, and are intensity 18cN / dtex or more in concrete terms, water the rate is particularly low, cut resistance, abrasion resistance, high strength, and is excellent in elongation difficulty during load continuation (creep resistance), particularly preferred is a polyarylate fiber comprising simultaneously satisfy molten liquid crystal polymer.

  When using the rope in water or when exposed to wet conditions during use, the aramid fiber has a relatively high water absorption, so there are changes in physical properties such as dimensional changes and strength during use. May occur and may not be suitable.

  In general, as a use of a fiber rope composed of high-strength fibers, there are relatively many severe conditions such as a continuous use application under a high load. Under such conditions of use, ultra high molecular weight polyethylene fibers may be relatively inferior in creep resistance and may be unfavorable because they may cause longitudinal elongation during use and cause inconvenience. .

  In the rope of the present invention, fiber tows other than the above-described fiber tows A and B may be mixed and twisted. In this case, the fiber elongation of the fiber tows other than the fiber tows A and B is preferably smaller than the elongation of the fiber tows A and larger than the elongation of the fiber tows B.

  In the rope of the present invention, the ratio of the elongation of the fiber tow A to the elongation of the fiber tow B needs to be A elongation / B elongation = 1.25 to 10, preferably 2 to 7 More preferably, it is 2.5-5. If the elongation of A / the elongation of B is less than 1.25, both A and B will be a combination of low elongation, and therefore the elongation of the rope itself will be low, so increase the strength utilization rate of the entire rope. I can't. On the other hand, if the elongation of A / the elongation of B exceeds 10, inevitably, A becomes a fiber having a very high elongation. However, such a high elongation fiber generally has a low strength and a mechanical strength. Since it is extremely weak to fatigue and extremely weak to heat generated by friction, a rope using the same is remarkably inferior in mechanical strength and wear resistance.

  Furthermore, in the rope of the present invention, by making the yarn length of the fiber tow B larger than the yarn length of the fiber tow A, the elongation as the rope can be maintained moderately, and the strength utilization rate of the entire rope is increased. Can do. Specifically, it is necessary that B yarn length / A yarn length = 1.015 to 1.150, preferably 1.020 to 1.130, more preferably 1.035 to 1.125. is there. When the yarn length of B / the yarn length of A is less than 1.015, the elongation of the rope itself is low, so the strength utilization rate of the entire rope cannot be increased. On the other hand, if the B yarn length / A yarn length exceeds 1.150, it may become difficult to produce a rope with a high quality and uniform quality, such as sticking or warping in the production process. There is.

  In the rope of the present invention, the mixing ratio of the fiber tow B is preferably 25 to 85% by mass, more preferably 30 to 80% by mass, and further preferably 40 to 70% by mass. If the mixing ratio of the fiber tow B is less than 25% by mass, the strength of the rope may be insufficient. On the other hand, if the mixing ratio of the fiber tow B exceeds 85% by mass, the cost increases, which is not preferable.

Next, in the rope of the present invention, the fibers constituting the fiber tow B must be polyarylate fibers made of a molten liquid crystal polymer as described above .
As used herein, the molten liquid crystal polymer is mainly an aromatic polyester that exhibits optical anisotropy (liquid crystallinity) in the melt phase. For example, the sample is placed on a hot stage, heated at a high temperature in a nitrogen atmosphere, and transmitted through the sample. It can be recognized by observing light. A polyarylate composed of a molten liquid crystal polymer has a repeating structural unit derived from an aromatic diol, an aromatic dicarboxylic acid, an aromatic hydroxycarboxylic acid or the like. What consists of a combination is preferable.

  More preferably, it is a polymer comprising a combination of repeating structural units (5), (8), (9) represented by Chemical Formula 1 and Chemical Formula 2, and more preferably a polymer corresponding to (5), It is an aromatic polyester in which the component (Q) in Chemical Formula 3 is 4 to 45 mol%.

  The melting point of the above-mentioned molten liquid crystal polymer is preferably 250 to 350 ° C, more preferably 260 to 320 ° C. The melting point here is the peak temperature of the main endothermic peak observed with a differential scanning calorimeter (DSC: for example, TA3000 manufactured by Mettler). Specifically, using a DSC apparatus, a sample of 10 to 20 mg is taken and sealed in an aluminum pan, and then nitrogen as a carrier gas is flowed at 100 mL / min, and an endothermic peak is measured when the temperature is raised at 20 ° C./min. If a clear endothermic peak does not appear in the above 1st Run depending on the type of polymer, raise the temperature to 50 ° C higher than the expected flow temperature at a rate of 50 ° C / min and hold at that temperature for 3 minutes or more. Then, after complete melting, it is cooled to 50 ° C. at a rate of 80 ° C./min, and then an endothermic peak is measured at a temperature increase rate of 20 ° C./min (for example, JIS K7121 test method).

  The polyarylate comprising the above-mentioned molten liquid crystal polymer has thermoplastic properties such as polyethylene terephthalate, modified polyethylene terephthalate, polyolefin, polycarbonate, polyarylate, polyamide, polyphenylene sulfide, polyester ether ketone, and fluororesin within a range not impairing the effects of the present invention. A polymer may be added. Various additives such as inorganic substances such as titanium oxide, kaolin, silica and barium oxide, carbon black, colorants such as dyes and pigments, antioxidants, ultraviolet absorbers and light stabilizers may be added.

  Next, the manufacturing method of the polyarylate fiber which consists of said molten liquid crystal polymer is demonstrated below. Polyarylate fibers made of a molten liquid crystal polymer can be made into fibers by a normal melt spinning method. When fiberizing is performed, the single fiber fineness is preferably 0.3 to 15 dtex, and more preferably 1 to 10 dtex. When the single fiber fineness is less than 0.3 dtex, there is a possibility that problems such as generation of fuzz due to cutting of single fibers due to rubbing at the time of manufacture, and occurrence of defective portions due to fusion of single fibers may occur. Also, if the single fiber fineness exceeds 15 dtex, the feel becomes stiff and the user's satisfaction cannot be obtained, or when the rope is manufactured, the fiber convergence is deteriorated, resulting in problems in the process. There is a fear. The fiber of the present invention already has sufficient mechanical and thermal performance, especially dimensional stability, in the spun state, but further improves strength and wear resistance, increases product performance and adds value. From the point of attachment, it is preferable to use after heat treatment. The heat treatment is carried out by solid phase polymerization in an inert gas atmosphere such as nitrogen, in an oxygen-containing active gas atmosphere such as air, or under reduced pressure. The heat treatment atmosphere preferably has a melting point of the molten liquid crystal polymer of −60 ° C. or higher and + 10 ° C. or lower.

  The polyarylate fiber made of a molten liquid crystal polymer obtained by the above-described production method needs to have mechanical properties having a tensile strength of 18 cN / dtex or more and an initial tensile modulus of 400 cN / dtex or more. Furthermore, the heat treatment promotes the solid-phase polymerization of the polymer forming the fiber, resulting in an increase in molecular weight, resulting in not only an improvement in the mechanical properties of the fiber, but also an improvement in heat resistance as seen in an increase in melting point and infusibilization. Occur. Due to this heat resistance improvement, the fiber of the present invention does not cause the fiber form to be collapsed or the fiber properties to be deteriorated due to remelting even when heated and mixed with a thermoplastic resin in a melt molding machine or an injection molding machine. Therefore, the thermoplastic resin can be reinforced after molding. Further, the fiber of the present invention has a polymer molecular component mainly composed of a hydrophobic monomer, and its fiber structure is dense and does not have voids such as voids. Therefore, the equilibrium moisture content of the fiber is extremely low and non-water-absorbing. For this reason, when heating and mixing with a thermoplastic resin, the drying process for removing moisture from the fiber is easy, and the moisture released from the fiber is extremely low, so the resin deteriorates due to hydrolysis during thermoforming. The adverse effect of decomposition is extremely small.

  As a means for producing the rope of the present invention, it can be industrially produced stably using a known method. For example, when fiber tow A and fiber tow B are twisted separately, and then fiber tow A and fiber tow B are mixed and twisted, overfeed is added to fiber tow B, and fiber tow B is better than fiber tow A. There is a method of mixing so that the fiber length becomes longer at a certain ratio. In addition, after the fiber tow B is twisted in the forward direction and then mixed with the fiber tow A, the entire fiber is twisted in the opposite direction, and the rope is stretched by the twisting rate of the fiber tow B. There is also.

  Furthermore, the rope of the present invention exhibits excellent physical properties in a wide range of uses even when used alone, but can also exhibit excellent characteristics when used in combination with or mixed with other ropes. In that case, the ratio of the rope of the present invention is 10 to 100% by mass, preferably 30% by mass or more, and more preferably 50% by mass or more. The higher the ratio of the rope of the present invention in the entire rope, the more easily the characteristics of the rope of the present invention are exhibited. In addition, it is possible to easily obtain a rope structure having physical properties that meet the purpose by adjusting the ratio according to the application. The rope to be combined other than the rope of the present invention may be a rope made of natural fibers such as hemp or cotton, a rope made of synthetic fiber tow of long fiber, or a synthetic fiber tow made of spun yarn of short fiber. It may be a mixed tow of fibers and short fibers. One or more types of ropes may be combined.

  According to the present invention, it has become possible to produce a rope having an appropriate elongation and excellent strength utilization. The rope at least partly composed of the above rope is suitably used for land rope, marine rope, marine rope, underwater rope, and the like. Specific examples include land net ropes, land winch ropes, marine winch ropes, playground equipment ropes, ship mooring ropes, elevator ropes, fishing net ropes, and the like.

  EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples. In the present invention, the fiber strength, elastic modulus, rope tensile strength, tensile elongation, knot strength, and pulley bending fatigue resistance mean those measured by the following measuring methods.

[Fiber strength, elastic modulus cN / dtex]
In accordance with JIS L1013, measurement was performed under the conditions of a test length of 20 cm, an initial load of 0.09 cN / dtex, and a tensile speed of 10 cm / min, and an average value of 5 or more points was adopted.

[Rope tensile strength N, tensile elongation%]
In accordance with JIS L1013, measurement was performed using a tensile load measuring machine (manufactured by INSTRON) using a 300 kg full-scale air pressure bonding special chuck (air pressure: 0.6 MPa).

[Rope knot strength cN / dtex]
In accordance with JIS L1013, measurement was performed using a tensile load measuring machine (manufactured by INSTRON) using a 300 kg full-scale air pressure bonding special chuck (air pressure: 0.6 MPa). The measurement was performed by fixing the sample so that the nodal point was at the center of the measurement sample length.

[Evaluation of anti-fiber friction fatigue resistance of rope]
As shown in FIG. 1 (A), a test rope sample is hung between two pulleys (center distance 500 mm), the lower pulley is rotated three times in the S direction, twist is applied, a constant load is applied, and the pulley is Reciprocally rotate by 80 degrees to give friction between fibers in the twisted portion. The friction fatigue resistance was evaluated based on the count when the rope sample broke, with 1 count per reciprocating motion.

[Evaluation of pulley bending fatigue resistance of rope]
As shown in FIG. 1 (B), a test rope sample is hung between two pulleys (center distance 500 mm) smaller in diameter of the lower pulley than the upper pulley, a constant load is applied, and the pulley is Reciprocally rotate by degrees to give metal-fiber friction to the pulley part with a small diameter. The friction fatigue resistance was evaluated based on the count when the rope sample broke, with 1 count per reciprocating motion.

[Strong utilization rate of rope]
The strength of each tow constituting the rope in the untwisted state is measured, and the sum of the strength values is defined as X (N). The strength value of the rope manufactured by using the tow and meeting under the conditions of Examples and Comparative Examples described later is Y (N). In this case, the strong utilization rate is calculated by the following formula.
(Y / X) × 100 (%)

[Reference example]
Fiber tow;
In the following examples and comparative examples, the content of the fiber tow constituting the rope is as follows.
1. High-strength fiber (1) Tow polyarylate fiber (“Vectran” (registered trademark) manufactured by Kuraray Co., Ltd.);
Strength 24.3 cN / dtex, elongation 4.5%, single fiber fineness 5.6 dtex, toe fineness 1100 dtex.
2. High-strength fiber (2) tow polyarylate fiber ("Vectran" (registered trademark) manufactured by Kuraray Co., Ltd.);
Strength 22.8 cN / dtex, elongation 4.1%, single fiber fineness 5.6 dtex, tow fineness 1100 dtex.
3. PVA fiber Tobinilon (manufactured by Kuraray Co., Ltd.);
Strength 8.5 cN / dtex, elongation 9.0%, single fiber fineness 2.0 dtex, toe fineness 1100 dtex.
4). Polyester fiber (1) tow A polyester chip having an intrinsic viscosity of 0.75 was solid-phase polymerized at 230 ° C. under vacuum to obtain a polyester chip having an intrinsic viscosity of 0.89. This polyester chip was melt extruded at 300 ° C., discharged from a mold having a hole of 110 holes, and scraped off at a speed of 1000 m / min. Thereafter, the yarn is stretched 4.5 times in an 80 ° C. water bath with three yarns, and a polyester having a strength of 8.0 cN / dtex, an elongation of 14.0%, a single fiber fineness of 3.3 dtex, and a toe fineness of 1100 dtex. Fiber (1) tow was obtained.
5. Polyester fiber (2) tow A polyester chip having an intrinsic viscosity of 0.75 was melt extruded at 300 ° C., discharged from a mold having a hole of 110 holes, and scraped off at a speed of 1000 m / min. Thereafter, the polyester fiber having a strength of 2.9 cN / dtex, an elongation of 47.0%, a single fiber fineness of 3.3 dtex, and a toe fineness of 1100 dtex is obtained by double-stretching in an 80 ° C. water bath with three yarns. 2) A tow was obtained.
In addition, the intrinsic viscosity of the polyester chip used for producing the polyester fibers (1) and (2) was measured using an Ubbelohde viscosity tube using a measurement atmosphere temperature of 35 ° C., a measurement solvent of orthochlorophenol.
6). Nylon 6 fiber (1) Tow Ny6 chip (“SF1018A” manufactured by Ube Industries, Ltd.) was melt extruded at 275 ° C., discharged from a mold having a hole of 95 holes, and scraped off at a speed of 1000 m / min. Thereafter, the yarn is stretched 3.5 times in a 90 ° C. water bath while combining four yarns. A nylon having a strength of 5.2 cN / dtex, an elongation of 18.0%, a single fiber fineness of 3.5 dtex, and a toe fineness of 1330 dtex. Six fibers (1) tow were obtained.
7). Nylon 6 fiber (2) tow Ny6 chip (“1011FB” manufactured by Ube Industries, Ltd.) was melt extruded at 265 ° C., discharged from a mold having a hole of 95 holes, and scraped off at a speed of 1000 m / min. Thereafter, the yarn is double-stretched in a 90 ° C. water bath while combining four yarns, and the strength is 2.7 cN / dtex, the elongation is 51.0%, the single fiber fineness is 3.5 dtex, and the toe fineness is 1330 dtex nylon 6 fiber ( 2) A tow was obtained.

[Example 1]
Using the high-strength fiber (1) in the above reference example as the fiber tow B, the two fiber tows B were twisted together with an S twist of 160 T / m to obtain a twisted rope.
The twisted rope and one fiber tow of polyester (1) in the above reference example as the fiber tow A were twisted together with a Z twist of 230 T / m (prescription 1) to produce a rope with a total fineness of 3300 dtex. The strength of the obtained rope is 550.8N, the strength utilization rate is 88.5%, the elongation is 11.5%, the inter-fiber friction fatigue resistance (number of times until the rope breaks) is 9700 times, and the pulley bending resistance Fatigue property (number of times until rope breakage) was 16500 times, which was a good physical property.

[Example 2]
In the same manner as in Example 1, the high-strength fiber (1) in the above Reference Example was used as the fiber tow B, and two fiber tows B were twisted together with an S twist of 50 T / m to obtain a twisted rope.
The twisted rope and one fiber tow of the polyester (1) in the above reference example as the fiber tow A were twisted together with an S twist of 110 T / m (prescription 2) to produce a rope with a total fineness of 3300 dtex. At this time, when feeding the twisted rope made of the fiber tow B, 4% overfeed was applied. The strength of the obtained rope is 536.3N, the strength utilization rate is 86.1%, the elongation is 8.8%, the inter-fiber friction fatigue resistance (number of times until the rope breaks) is 7600 times, and the pulley is flex-resistant The fatigue properties (number of times until rope breakage) were 13200 times, which was a good physical property.

[Example 3]
A rope having a total fineness of 3300 dtex was produced by the method of Formula 1 in the same manner as in Example 1 except that the fiber tow A was changed to the PVA fiber tow in the above Reference Example. The strength of the obtained rope was 554.6 N, the strength utilization rate was 88.3%, the elongation was 9.8%, the friction fatigue resistance between fibers (number of times until the rope breaks) was 13,200 times, and the pulley was bent The fatigue properties (number of times until rope breakage) were 23400 times, which were good physical properties.

[Example 4]
A rope having a total fineness of 3500 dtex was produced by the method of Formula 1 in the same manner as in Example 1 except that the fiber tow A was changed to the nylon 6 fiber (1) tow in the above Reference Example. The resulting rope has a strength of 521.3N, a strength utilization factor of 86.6%, and an elongation of 12.6%. The inter-fiber friction fatigue resistance (number of times until the rope breaks) is 11,200 times, and the pulley is flex-resistant. Fatigue property (number of times until rope breakage) was 18700 times, which was a good physical property.

[Comparative Example 1]
A rope having a total fineness of 3300 dtex was produced by the method of Formula 1 in the same manner as in Example 1 except that the fiber tow A was changed to the polyester fiber (2) tow in the above Reference Example. The strength of the obtained rope was 456.8 N, the strength utilization rate was 80.6%, and the elongation was 8.6%. Both strength and strength utilization rates were low. Furthermore, the friction fatigue resistance between fibers (the number of times until the rope breaks) is 2600 times, and the pulley bending fatigue resistance (the number of times until the rope breaks) is 4500 times, and the characteristics are remarkably deteriorated as compared with Examples 1 and 2. did.

[Comparative Example 2]
A rope having a total fineness of 3500 dtex was produced by the method of Formula 1 in the same manner as in Example 1 except that the fiber tow A was changed to the nylon 6 fiber (2) tow in the above Reference Example. The strength of the obtained rope was 443.8N, the strength utilization rate was 77.9%, and the elongation was 7.4%. Both the strength and strength utilization rates were low. Furthermore, the friction fatigue resistance between fibers (number of times until rope breakage) was 3400 times, and the resistance to pulley bending fatigue (number of times until rope breakage) was 3200 times.

[Comparative Example 3]
A rope having a total fineness of 3300 dtex was produced by the method of Formula 1 in the same manner as in Example 1 except that the fiber tow A was changed to the high-strength fiber tow (2) in the above Reference Example. The strength of the obtained rope was 630.5 N, and the strength utilization rate was 80.3%. Although the strength was sufficiently high, the strength utilization rate was low. The elongation was as low as 4.5%.

[Comparative Example 4]
A rope with a total fineness of 3300 dtex was produced by the method of Formula 2 in the same manner as in Example 2 except that the overfeed value was 0%. The strength of the obtained rope was 480.7 N, and the strength utilization rate was 77.2%. Both the strength and strength utilization rates were low. The elongation was a low value of 4.8%. Furthermore, the friction fatigue resistance between fibers (number of times until rope breakage) was 3500 times, and the resistance to pulley bending fatigue (number of times until rope breakage) was 8700 times, and the performance was deteriorated as compared with Example 2.

[Comparative Example 5]
Except for setting the overfeed value to 25%, an attempt was made to manufacture a rope by the method of Formula 2 in the same manner as in Example 2. However, when the rope was manufactured, warping and tangling occurred frequently, and a product was obtained. It was difficult.

  The rope at least partially composed of the rope of the present invention is suitably used for land ropes, marine ropes, marine ropes, underwater ropes, and the like. Specific examples include land net ropes, land winch ropes, marine winch ropes, playground equipment ropes, ship mooring ropes, elevator ropes, fishing net ropes, and the like.

The schematic diagram which shows the durability evaluation method of the rope of this invention. The schematic diagram which shows the difference of the SS curve of the fiber tow which comprises the rope of this invention, and the rope of a prior art (normal twist). The schematic diagram which shows an example of the side structure of the rope of this invention.

Explanation of symbols

1 Fiber tow A
2 Fiber tow B

Claims (3)

Low elongation, which is a polyarylate fiber consisting of a high elongation fiber tow A and a molten liquid crystal polymer, comprising a twisted yarn in which two or more kinds of fiber tows are mixed, and at least a part of which satisfies both the following (1) to (2) A rope composed of fiber tow B.
(1) A elongation / B elongation = 1.25-10,
(2) B yarn length / A yarn length = 1.015 to 1.150. The rope according to claim 1, wherein the mixing ratio of B is 25 to 85 mass%. The rope according to claim 1 or 2, wherein B is a polyarylate fiber made of a molten liquid crystal polymer having a strength of 18 cN / dtex or more.