rope

Abstract

To provide a rope capable of preventing rigidity from being lost.SOLUTION: A rope is constituted by twisting or combining a plurality of strands 2 whose cross-sectional shapes in a radial direction are constituted to be substantially the same in whole area in a lengthwise direction. The strand 2 is constituted by twisting or combining a plurality of first yarns A formed of monofilament yarn and second yarns B formed of multifilament yarn. The first yarn A is more rigid than the second yarn B. The second yarn has lower elongation than the first yarn. The second yarn B is disposed between the first yarns A.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a rope. [Background technology]

[0002] An example of a rope is described in Patent Document 1. This rope is constructed by twisting together three strands, each strand having a core portion formed by twisting together a plurality of core yarns and a skin portion formed by disposing a plurality of skin yarns around the core portion, and the core yarn is constructed by twisting together a plurality of polyethylene monofilaments. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Jpn. Jpn. Published No. 63-15351 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the rope described in Patent Document 1, the core yarn is made of multiple polyethylene monofilaments twisted together. Therefore, for example, when the rope is pulled to apply tension to the core, permanent strain is generated in the polyethylene monofilament as the core yarn, causing a problem that the rope loses its rigidity. Incidentally, the rope described in Patent Document 1 actively uses the permanent strain to suppress a decrease in the strength of the rope. Note that this problem is not limited to the rope described in Patent Document 1, but occurs in all ropes in which the core yarn is made of only monofilaments.

[0005] SUMMARY OF THE PRESENT EMBODIMENTS An object of the present invention is to provide a rope using monofilaments that can prevent loss of rigidity. [Means for solving the problem]

[0006] The present invention is a rope constructed by twisting or combining multiple strands whose radial cross-sectional shape is approximately the same throughout the entire length, wherein the strands are constructed by twisting or combining multiple first yarns constructed of monofilament yarns and second yarns constructed of multifilament yarns, the first yarns being more rigid than the second yarns, the second yarns having lower elongation than the first yarns, and the second yarns being disposed between the first yarns.

[0007] According to the above configuration, the second yarn, which is pushed and deformed by the first yarn, fills the gaps between the first yarns, thereby integrating the first yarns through the second yarn. As a result, the first yarns, which are arranged between the second yarns A, which are less likely to stretch than the first yarn A, are prevented from moving individually. For example, when tension is applied to the rope, it is possible to prevent permanent strain from occurring due to the individual first yarns stretching, and as a result, it is possible to prevent the rope from becoming loose.

[0008] In the rope of the present invention, the strand may include an inner layer portion formed by twisting together a plurality of the first yarns and the second yarns, and an outer layer portion that covers the inner layer portion in the circumferential direction.

[0009] According to this configuration, the outer layer portion covers the inner layer portion, and thus the inner layer portion can be protected by the outer layer portion.

[0010] In addition, in the rope of the present invention, the strand may have a central portion composed of the second yarn and a peripheral portion covering the central portion in the circumferential direction, the peripheral portion being composed of the first yarn and the second yarn.

[0011] According to the above configuration, since the central portion is made of the second yarn composed of the multifilament, the central portion is less likely to bend, and since the peripheral portion is formed so as to cover the central portion in the circumferential direction, the peripheral portion can be formed around the central portion, making it easy to form the peripheral portion.

[0012] In the rope of the present invention, in the peripheral portion, the first yarn and the second yarn may be arranged in rotational symmetry in the circumferential direction with the central portion as the center.

[0013] According to this configuration, the first yarn and the second yarn are arranged rotationally symmetrically in the circumferential direction about the central portion, so that the strength of the strand in the circumferential direction can be made constant.

[0014] In the rope of the present invention, the peripheral portion may be configured such that the first yarns and the second yarns are alternately arranged one by one in the circumferential direction.

[0015] According to the above configuration, the first yarns and the second yarns are arranged alternately, so that the two first yarns with the second yarn therebetween can be integrated.

[0016] In the rope of the present invention, the central portion may be made up of a plurality of the second yarns.

[0017] According to the above configuration, since the central portion is made up of a plurality of the multifilament yarns, the central portion is made even less likely to bend, and as a result, a rope that is less likely to bend can be formed. Effect of the Invention

[0018] Therefore, according to the rope of the present invention, when tension is applied to the rope, the first yarn can be prevented from becoming slack, and therefore the rope can be prevented from losing its rigidity. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a diagram showing a radial cross section of a rope according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a diagram showing a radial cross section of a strand according to the embodiment. [Diagram 3] FIG. 3 is a view showing a radial cross section of the strand according to the embodiment, in which the radially integral portion and the circumferentially integral portion are clearly shown. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, a rope 1 according to one embodiment of the present invention will be described. This rope 1 is used, for example, as a purse seine or bottom trawl rope in fishing grounds.

[0021] In the following description, the "radial direction" refers to the direction indicating the thickness or diameter of the rope 1 or strand 2, and the "lengthwise direction" refers to the direction in which the rope 1 or strand 2 extends. Additionally, the "circumferential direction" refers to the direction around an imaginary line (not shown) that extends along the lengthwise direction at the center of the rope 1 or strand 2. The radial direction and the lengthwise direction are perpendicular to each other.

[0022] As shown in FIG. 1, the rope 1 is formed by twisting together a plurality of strands 2 (six in this embodiment). The rope 1 in this embodiment is a six-strand rope. Therefore, the rope 1 has a plurality of strands 2 (six in this embodiment). Furthermore, in the rope 1 of this embodiment, a core material Z is provided in the center of the plurality of strands 2 arranged in the circumferential direction. As the core material Z, for example, a polyester rope with a diameter of 9 mm is used. The rope 1 of this embodiment is made of resin.

[0023] The rope 1 of this embodiment is configured so that the radial cross-sectional shape is approximately the same throughout the entire length. As described above, the rope 1 is configured by twisting together a plurality of strands 2. Therefore, in the length direction, each strand 2 is twisted circumferentially, so that the rope 1 has the same cross-sectional shape throughout the entire length. Therefore, the rope 1 of this embodiment has a so-called "Kintaro-ame structure." Here, the strands 2 employed in configuring the rope 1 of this embodiment are all of the same type. Therefore, the following description will focus on one strand 2, and the same will also be applied to the other strands 2.

[0024] The strand 2 is formed by twisting together a first yarn A, a second yarn B, and a third yarn C in a plurality of strands (specifically, 20 strands as shown in FIG. 2).

[0025] The "first yarn" is a monofilament yarn composed of one single yarn, specifically, a monofilament yarn having a diameter of 0.2 mm to 5.0 mm. For example, the first yarn A is a PET monofilament or a PP monofilament. The first yarn A has a property of bending and deteriorating when bent. Note that "bending" here means that the bent state does not return to its original state. On the other hand, the "second yarn" is a single multifilament yarn (for example, a polyethylene multifilament yarn) composed of several tens of single fibers, specifically, an ultra-high molecular weight polyethylene fiber (HMPE) yarn having a strength of 20 cN / dT or more and a breaking elongation of 10% or less. For example, the second yarn B is IZANAS (registered trademark) SK777. The second yarn B has a property of not deteriorating even when bent, and is used, for example, in dense woven parts of clothing and firefighting suits. Therefore, the second yarn B does not bend. Moreover, the second yarn B has a high elasticity and is difficult to stretch. The first yarn A is more rigid than the second yarn B. Here, "rigidity" is an index indicating the hardness of the outer circumference and the difficulty of bending, and refers to the ability to withstand damage caused by bending or twisting. In this embodiment, all the first yarns A are PET monofilaments with a diameter of 1.5 mm, and all the second yarns B are Izanas (registered trademark) SK777 (1600d x 4 x 3) with a strength of 33 cN / dT or more.

[0026] 2, the strand 2 of this embodiment has a multi-braided structure in which ten strands of the first yarn A and the second yarn B are twisted together to form an inner layer 4, and ten strands of the third yarn C are arranged on the surface of the inner layer 4 to form an outer layer 3. The strand 2 has a radial cross-sectional shape that is substantially uniform throughout its length.

[0027] The inner layer portion 4 is formed by twisting together a plurality of first yarns A and second yarns B. The inner layer portion 4 of this embodiment includes a central portion 40 and a peripheral portion 41 that circumferentially covers the central portion 40. Therefore, the inner layer portion 4 of this embodiment has a multi-layer structure. The inner layer portion 4 is formed by twisting together the first yarns A and the second yarns B. In this embodiment, a total of 10 yarns are twisted together. Note that in the inner layer portion 4 of this embodiment, the number of second yarns B is greater than the number of first yarns A.

[0028] The central portion 40 is the radial center of the strand 2. In this embodiment, the central portion 40 is made of the second yarn B. In addition, in this embodiment, the central portion 40 is made of a plurality of (specifically, two) second yarns B. As shown in FIG. 2, the second yarns B constituting the central portion 40 are pressed by the peripheral portion 41 described below and are deformed in the radial direction.

[0029] The peripheral portion 41 is an intermediate layer disposed between the central portion 40 and the outer layer portion 3 described later in the cross section of the strand 2. The peripheral portion 41 is an annular layer that is aligned along the central portion 40 to cover the central portion 40. In the peripheral portion 41, the number of first yarns A and second yarns B is the same. The peripheral portion 41 of this embodiment is composed of a total of eight yarns, four first yarns A and four second yarns B. In addition, the first yarns A and the second yarns B are alternately arranged in the peripheral portion 41. Specifically, as shown in FIG. 2, the first yarns A and the second yarns B are alternately arranged in the circumferential direction so that the second yarns B are arranged to the left and right and above and below the central portion 40 (specifically, the second yarns B, B adjacent to each other on the left and right). Furthermore, in the peripheral portion 41 of this embodiment, the first yarns A and the second yarns B are alternately arranged one by one in the circumferential direction. Therefore, the peripheral portion 41 has a single-layer structure in the radial direction.

[0030] As described above, in the peripheral portion 41 covering the central portion 40, the first yarns A and the second yarns B are alternately arranged one by one in the circumferential direction. Therefore, in the peripheral portion 41, the first yarns A and the second yarns B are arranged in rotational symmetry in the circumferential direction with the central portion 40 as the center. Specifically, the peripheral portion 41 is configured to have four-fold rotational symmetry.

[0031] As described above, in the inner layer portion 4, the first yarn A and the second yarn B constituting the peripheral portion 41 are alternately arranged so as to cover the second yarn B constituting the central portion 40. Therefore, in the inner layer portion 4, the second yarn B is arranged between two first yarns A. In this way, what is composed of two first yarns A and the second yarn B arranged between the first yarns A is hereinafter defined as an "integral portion 4a". That is, the inner layer portion 4 includes an integral portion 4a. The inner layer portion 4 of this embodiment includes multiple (specifically, six) integral portions 4a.

[0032] As shown in Figures 2 and 3, the integral portion 4a includes a circumferential integral portion 4b configured by disposing a second yarn B between two first yarns A in the circumferential direction, and a radial integral portion 4c configured by disposing a second yarn B (specifically, two second yarns B) between two first yarns A in the radial direction. In the inner layer portion 4 of this embodiment, four circumferential integral portions 4b and two radial integral portions 4c are configured by the arrangement of the first yarns A and the second yarns B. For convenience of explanation, Figures 2 and 3 show one each of the circumferential integral portion 4b and radial integral portion 4c.

[0033] The outer layer portion 3 covers the inner layer portion 4 in the circumferential direction. The outer layer portion 3 is disposed on the outermost side in the radial direction of the strand 2. The outer layer portion 3 is configured as an annular layer. The outer layer portion 3 prevents, for example, the first yarn A and the second yarn B configured as the inner layer portion 4 from coming apart. The outer layer portion 3 is configured by twisting together a plurality of third yarns C (10 in this embodiment). The material of the third yarn C is a film yarn or a monofilament yarn, and specifically, it is preferable that the third yarn C is a film yarn or a monofilament yarn having a fineness of 1100 dT or more. The third yarn C in this embodiment is made of ultra-high molecular weight polyethylene fiber (HMPE) (3000 d×3).

[0034] As described above, according to the rope 1 of this embodiment, the second yarn B, which is pushed and deformed by the first yarn A, fills the gaps between the first yarns A, thereby integrating the first yarns A together via the second yarn B. Therefore, the first yarns A arranged between the second yarns B, which are less likely to stretch than the first yarns A, are prevented from moving individually. For example, when tension is applied to the rope 1, it is possible to prevent permanent strain from occurring due to the individual first yarns A stretching, and as a result, it is possible to prevent the rope 1 from becoming loose. Specifically, in the strand 2 of this embodiment, the integrated portion 4a is formed by two first yarns A and a second yarn B arranged between the first yarns A, and the compressed second yarn B fills the gaps to prevent misalignment between the first yarns A, thereby integrating the first yarns A together, and since the second yarn B is less likely to stretch than the first yarn A, it is possible to prevent the individual first yarns A from stretching and causing permanent set, and it is possible to prevent the rope 1 and the strands 2 that make up the rope 1 from becoming loose.

[0035] In addition, in this embodiment, the second yarn B is Izanas (registered trademark) SK777 having a strength of 33 cN / dT or more, so that the strand 2 can have a strength equivalent to that of, for example, a metal wire, and since the rope 1 using the strand 2 is made of resin, it can be made lighter than, for example, a metal wire.

[0036] Furthermore, in the rope 1 of the present embodiment, the outer layer portion 3 covers the inner layer portion 4, so that the outer layer portion 3 can protect the inner layer portion 4.

[0037] In addition, in the rope 1 of this embodiment, the inner layer 4 is covered by the outer layer 3, which increases the strength of the strand 2 and improves the strength (for example, abrasion resistance and damage resistance) of the rope 1 as a whole. Furthermore, in the strand 2 of this embodiment, the inner layer 4 includes the central portion 40 and the surrounding portion 41 that circumferentially covers the central portion 40, so that the strength of the strand 2 as a whole can be improved accordingly.

[0038] Furthermore, in the rope 1 of this embodiment, the central portion 40 is made of the second yarn B, which is a multifilament, and therefore the central portion 40 is less likely to bend. Furthermore, in this embodiment, the inner layer 4 has a multilayer structure, and the central portion 40 is made of the second yarn B, so that the radially integrated portion 4c can be formed by the arrangement of the first yarn A and the second yarn B in the radial direction. Therefore, the first yarns A can be integrated with each other in the radial direction of the strand 2, and the first yarns A can be prevented from moving individually.

[0039] In addition, since the peripheral portion 41 is disposed so as to cover the central portion 40 in the circumferential direction, it is easy to form the peripheral portion 41 around the central portion 40. Specifically, the peripheral portion 41 is an annular layer that is aligned along the central portion 40 so as to cover the central portion 40, and therefore is easy to form.

[0040] In the rope 1 of this embodiment, the first yarn A and the second yarn B are arranged in rotational symmetry in the circumferential direction centered on the central portion 40, so that the strength of the strand 2 in the circumferential direction can be made constant. In addition, the peripheral portion 41 of this embodiment is configured with four-fold rotational symmetry, so that the aesthetic appearance of the inner layer portion 4 in the circumferential direction can be kept constant.

[0041] In the rope 1 and strand 2 of this embodiment, the first yarns A and the second yarns B are arranged alternately, so that two first yarns A with the second yarns B arranged therebetween can be integrated. Since the first yarns A and the second yarns B are always adjacent to each other over the entire circumference, the first yarns A can be reliably integrated.

[0042] In the strand 2 of this embodiment, the first yarn A and the second yarn B are arranged along the second yarn B that constitutes the central portion 40, making it easy to arrange the first yarn A and the second yarn B that constitute the peripheral portion 41. Also, by arranging the first yarn A and the second yarn B alternately around the central portion 40, the aesthetic appearance of the strand 2 can be kept constant.

[0043] Furthermore, in the rope 1 and strand 2 of this embodiment, the central portion 40 is made up of multiple multifilament yarns, making the central portion 40 even less likely to bend, and as a result, it is possible to form ropes 1 and strands 2 that are less likely to bend.

[0044] As shown in Figs. 2 and 3, in this embodiment, the first yarns A form the radially integrated portion 4c and the circumferentially integrated portion 4b, and therefore the first yarns A are integrated together in both the radial and circumferential directions, and the movement of each of the first yarns A can be more reliably suppressed. Specifically, when the rope 1 or the strand 2 is pulled in the length direction, the second yarns B are first compressed in the circumferential direction to fill the gaps between the first yarns A, and the first yarns A are integrated together to form the circumferentially integrated portion 4b. Then, as the circumferentially integrated portion 4b is formed, the second yarns B are compressed in the radial direction as well to fill the gaps between the first yarns A, and the first yarns A are integrated together to form the radially integrated portion 4c. Therefore, the integration of the first yarns A in the circumferential direction also occurs, and the movement of each of the first yarns A can be restricted in both the radial and circumferential directions.

[0045] Furthermore, in the inner layer portion 4 of this embodiment, the first yarn A and the second yarn B are arranged alternately so that the second yarn B is arranged to the left and right and above and below the central portion 40 in Figure 2 along the central portion 40 formed by the second yarn B. Therefore, when the first yarns A are integrated together, all of the second yarns B function to fill the spaces between the first yarns A without any waste, thereby forming the integrated portion 4a.

[0046] In this embodiment, the strand 2 is formed by twisting together a plurality of the first yarns A and the second yarns B, so that when the strand 2 is pulled in the longitudinal direction, the second yarns B tend to bite into the first yarns A, making it easy to form the integral portion 4a. Furthermore, in the strand 2 of this embodiment, the outer layer portion 3 is formed by twisting together a plurality of the third yarns C, so that the third yarns C run along the first yarns A and the second yarns B that make up the inner layer portion 4, while the outer layer portion 3 can protect the inner layer portion 4 from the outside.

[0047] Furthermore, as shown in Figures 2 and 3, in this embodiment, the first yarn A and the second yarn B are arranged alternately in the circumferential direction as the inner layer portion 4 so that the second yarn B is arranged to the left and right and above and below the second yarn B constituting the central portion 40. As a result, the circumferential integral portion 4b and the radially integral portion 4c are arranged to intersect, and the direction of the force applied to the second yarn B also intersects. As a result, all of the first yarns A constituting the inner layer portion 4 are integrated, which more reliably prevents permanent deformation from occurring in each of the first yarns A.

[0048] In addition, in this embodiment, the first yarns A are integrated with each other via the second yarns B, thereby suppressing the occurrence of permanent set, and as a result, the rigidity of the rope 1 can be maintained. Therefore, in the rope 1 with maintained rigidity, for example, when the rope 1 is wound by a winch, it is possible to suppress the second turn of the rope 1 from getting caught between the first turn of the rope 1. In addition, damage to the rope 1 due to wear can be reduced.

[0049] The rope of the present invention is not limited to the above-described embodiment, and the configuration may be modified, added, deleted, converted, etc. as appropriate without departing from the scope of the present invention.

[0050] In the above embodiment, all the first yarns A are described as PET monofilaments having a diameter of 1.5 mm, but the present invention is not limited thereto. For example, the first yarns A may include, in addition to PET monofilaments having a diameter of 1.5 mm, a monofilament having a diameter of 0.2 mm to 5.0 mm that is different from the PET monofilaments. The same is true for the second yarns B, which may include, in addition to IZANAS (registered trademark) SK777 having a diameter of 33 cN / dT or more, a monofilament having a strength of 20 cN / dT or more and a breaking elongation of 10% or less that is different from the PET monofilaments.

[0051] In the above embodiment, the central portion 40 in the inner layer portion 4 is formed of the second yarn B, and the peripheral portion 41 is formed by alternately arranging a total of eight first yarns A and second yarns B. However, for example, the central portion 40 may be formed of the second yarn B, and the peripheral portion 41 may be formed of only eight first yarns A. That is, it is sufficient that the two first yarns A arranged in the radial direction are integrated with the second yarn B constituting the central portion 40 therebetween, so that the radially integrated portion 4c is arranged evenly in the radial direction. This makes it possible to suppress the individual movement of the first yarns A evenly in the radial direction in the strand 2 (specifically, in the inner layer portion 4).

[0052] In the above embodiment, the central portion 40 in the inner layer portion 4 is configured from the second yarn B. However, for example, the central portion 40 may be configured from the first yarn A, and a total of eight first yarns A and second yarns B may be arranged alternately to configure the peripheral portion 41. That is, it is sufficient that two first yarns A arranged in the circumferential direction are integrated with the second yarn B therebetween, so that the circumferentially integrated portion 4b is arranged evenly in the circumferential direction. This makes it possible to prevent the first yarns A from moving individually evenly in the circumferential direction in the strand 2 (specifically, in the inner layer portion 4).

[0053] In the above embodiment, the strand 2 is constructed by twisting the first yarn A and the second yarn B together. However, the strand 2 may also be constructed by combining the first yarn A and the second yarn B, for example, by fixing them together.

[0054] In the above embodiment, the inner layer portion 4 has been described as having a greater number of second yarns B than the number of first yarns A. However, for example, the number of first yarns A may be greater than the number of second yarns B. In this case, it is conceivable that the first yarns A are adjacent to each other in the circumferential or radial direction, but the first yarns A and the second yarns B are arranged so that the rigidity of the entire strand 2 is not lost.

[0055] In the embodiment, the inner layer portion 4 has a multi-layer structure including the central portion 40 and the peripheral portion 41, but is not limited thereto, and for example, the inner layer portion 4 may have a single-layer structure. In this case, for example, the inner layer portion 4 may include only the peripheral portion 41.

[0056] In the above embodiment, the central portion 40 is described as being composed of multiple second yarns B, but, for example, the central portion 40 may be composed of a single second yarn B, or may be composed of three or more second yarns B.

[0057] As shown in FIG. 2, in the above embodiment, in the peripheral portion 41, the first yarn A and the second yarn B are alternately arranged in the circumferential direction so that the second yarn B is arranged to the left and right and above and below the central portion 40 formed of the second yarns B, B adjacent to each other on the left and right. However, this is not limited to the above, and for example, the first yarn A and the second yarn B may be alternately arranged in the circumferential direction so that the first yarn A is arranged to the left and right and above and below the central portion 40 formed of the second yarns B, B adjacent to each other on the left and right.

[0058] In the embodiment, the case where the peripheral portion 41 has four-fold rotational symmetry has been described, but for example, the peripheral portion 41 may have three-fold or two-fold rotational symmetry, or may have five-fold or more rotational symmetry.

[0059] In the above embodiment, the second yarn B was arranged between the first yarns A in the circumferential and radial directions to form the circumferential integral portion 4b and the radial integral portion 4c, but this is not limited to the above, and the second yarn B may be arranged between the first yarns A to form only the circumferential integral portion 4b.

[0060] In the above embodiment, the strand 2 includes the inner layer portion 4 and the outer layer portion 3. However, for example, the strand 2 does not have to include the outer layer portion 3.

[0061] In the above embodiment, the outer layer portion 3 is described as being formed by twisting together a plurality of third yarns C. However, for example, the outer layer portion 3 may be a tape or a cylindrical tube wrapped around the outer peripheral surface of the inner layer portion 4, a fiber such as PET or nylon that covers the inner layer portion 4, or a liquid resin that is applied to the outer peripheral surface of the inner layer portion 4.

[0062] In the above embodiment, as shown in FIG. 2, the outer layer 3 is configured as a single layer, but the outer layer 3 may be configured as two or more layers, for example, by overlapping the third yarn C.

[0063] In the above embodiment, the central portion 40 is described as being composed of the second yarn B, but for example, the central portion 40 may be composed so as to include (one or more) first yarns A. When the central portion 40 is composed of multiple first yarns A, it is considered that the first yarns A and the second yarns B are arranged in the peripheral portion 41 so as not to lose the rigidity of the entire strand 2.

[0064] In the above embodiment, one each of the first yarn A and the second yarn B is arranged in the peripheral portion 41, so that the peripheral portion 41 has a single-layer structure. However, for example, the peripheral portion 41 may have a multi-layer structure. In this case, two or more first yarns A or second yarns B are arranged in the radial direction. That is, the strand 2 in the above embodiment has a three-layer structure consisting of the central portion 40, the peripheral portion 41, and the outer layer portion 3, but the strand 2 may have a multi-layer structure consisting of four or more layers.

[0065] In the embodiment, the inner layer 4 is formed by twisting together a total of 10 strands of the first yarn A and the second yarn B, but this is not limited thereto. For example, the inner layer 4 may be formed by twisting together a total of 11 or more strands of the first yarn A and the second yarn B.

[0066] In the above embodiment, the rope 1 is described as having six strands, but the rope is not limited to this and may be, for example, a three strand or eight strand rope. [Explanation of symbols]

[0067] 1: rope, 2: strand, 3: outer layer, 4: inner layer, 4a: integral part, 4b: circumferential integral part, 4c: radial integral part, 40: center part, 41: peripheral part, A: first yarn, B: second yarn, C: third yarn, Z: core material

Claims

1. A rope formed by twisting or combining a plurality of strands each having a radial cross-sectional shape that is substantially the same throughout the length direction, The strand is constructed by twisting or combining a first yarn made of a monofilament yarn and a second yarn made of a multifilament yarn together, the first yarn being stiffer than the second yarn; The second yarn has a lower elongation than the first yarn, A rope, characterized in that the second yarn is disposed between the first yarns.

2. The rope according to claim 1 , wherein the strand comprises an inner layer portion formed by twisting together a plurality of the first yarns and the second yarns, and an outer layer portion covering the inner layer portion in a circumferential direction.

3. The rope according to claim 1 or claim 2, wherein the strand comprises a central portion constituted by the second yarn and a peripheral portion that covers the central portion in the circumferential direction and is constituted by the first yarn and the second yarn.

4. The rope according to claim 3, characterized in that in the peripheral portion, the first yarns and the second yarns are arranged rotationally symmetrically in the circumferential direction with the central portion as the center.

5. The rope according to claim 4 , wherein the first yarns and the second yarns are alternately arranged one by one in the circumferential direction in the peripheral portion.

6. 6. The rope according to claim 3, wherein the central portion is composed of a plurality of the second yarns.

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