JPH11200266A - Ropy material for longline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ropy material for a longline improved in abrasion resistance, water nonabsorption, etc., and capable of readily controlling for a high specific gravity. SOLUTION: This ropy material for a longline is braided by using a fibrous structure prepared by braiding or twisting an organic fiber having >=310 deg.C thermal decomposition starting temperature, >=18 g/de tensile strength and <=8% elongation at 0.5-7.0 twist multiplier as a core material and further using a plurality of resin-coated cords obtained by coating the surface thereof with a coating film of a thermoplastic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rope for a longline, which has high strength, has little strength deterioration in water, and whose specific gravity can be easily controlled in order to enhance sedimentation in water. More specifically, the present invention covers the surface of a fibrous structure containing organic high-performance fibers as a constituent fiber with a thermoplastic resin, and furthermore, uses a plurality of cords to form a high-strength fiber inherent in organic high-performance fibers. Expressed, and
By coating the surface with resin, strong deterioration in water is small, and in order to enhance sedimentation in water,
The present invention relates to a longline rope-like material whose specific gravity can be easily controlled by mixing a metal fiber into a fibrous structure or mixing a metal or metal compound powder into a thermoplastic resin to be coated.

[0002]

2. Description of the Related Art Gliding cords and ropes used in the field of sports and leisure, such as paragliders and balloons, cords and ropes related to industrial materials used on land such as nets and material transportation, and fishing nets and longlines Materials used for cords and ropes used in the field of fishery materials such as fishing lines, ships, etc. are usually polyester, nylon, vinylon, wholly aromatic polyester (polyarylate), ultra-high molecular weight polyethylene, wholly aromatic There are fibers such as polyamide (aramid), and recently polyparaphenylene benzobisoxazole fibers (hereinafter abbreviated as “PBO fibers”) have been added to these.

[0003] These fibers may be used alone or in a special case such that they are used without any treatment. However, in order to sufficiently exhibit the inherent properties of the fibers used, these fibers are usually treated in a thread form with an appropriate treating agent. After that, twist the yarn into cords and ropes,
Braided or knitted, or cords or ropes are twisted, braided or knitted and then treated with an appropriate treatment agent to make use of the characteristics in each field. Have been. Important requirements common to the common market for these cords and ropes include cord strength, abrasion resistance, flex durability, flexibility, handling, non-water absorption, drainage, water strength,
Water sedimentation (specific gravity) and the like. In particular, when used as a longline cord in the field of fishery materials, cords having properties such as cord strength, flexibility, handleability, non-absorbency, drainage, water strength, and sedimentation in water are required. .

[0004] In order to express these required characteristics, conventionally, a cord obtained by appropriately processing a synthetic resin monofilament or a synthetic resin multifilament has been used. For example, JP-A-4-214408
In the publication, it is proposed to create a monofilament composed of a copolymerized polyamide resin containing a dimerized fat component as a copolymer component, and to develop excellent strength and flexibility.
JP-A-7-75472 discloses that a nylon or polyester monofilament has a thickness of 0.05 to 0.20.
It has been proposed to add excellent strength, flexibility and handleability by adding about weight% of carbon black. On the other hand, in the case of using a multifilament, as disclosed in JP-A-54-35087, a stainless steel wire is twisted with a metal fiber as a core material, and then the surroundings are coated with a synthetic resin, and excellent flexibility, A fishing gear line having sedimentation in water (high specific gravity) is disclosed in Japanese Patent Application Laid-Open No. 57-112.
No. 467 proposes a high specific gravity rope which is non-water-absorbing and excellent in sedimentation in water, using a vinyl chloride resin containing metal or / and a metal compound powder and covering multifilaments such as nylon and polyester. Have been.

[0005] Cords or ropes obtained by subjecting a monofilament or a multifilament shown in the prior art to surface treatment or impregnation with an appropriate treatment agent are:
It has been confirmed that some of the required characteristics described above are improved. However, with the recent decrease in catches in the field of fisheries, especially large fish such as tuna, and the need to reduce the burden on workers, the required characteristics of products tend to be improved and expanded. The technology is still insufficient due to the appearance of sedimentation (specific gravity) in water and strong deterioration due to hydrolysis in water, and cords and ropes that completely satisfy the required characteristics have not been proposed.

For example, para-aramid fiber is 18 g / d
e, the cords and ropes using this fiber have recently been developed and utilized.
This fiber is liable to be fibrillated due to friction between fibers / fibers or between fibers / metals, and this is the main cause of strong deterioration, which has the disadvantage that the excellent high strength properties inherent to fibers cannot be sufficiently exhibited. Have. In order to remedy this disadvantage, a composite structure using nylon fibers with relatively good abrasion resistance for the surface layer of cords and ropes, and aramid fibers processed with a treatment agent for the core is used. Innovative measures have been put into practical use. However, cords and ropes having a composite structure having these forms are still insufficient, and in particular, in the case of aramid fibers, it has been impossible to completely prevent fibrillation of the fibers constituting the cords and the rope. Not in. That is, the aramid fiber has a problem that it cannot maintain sufficient product strength for a long period of time as a result of partial fibrillation due to friction with other objects. In addition, in recent years, in the field of marine materials, there is also a problem that the workability is deteriorated due to drainage of water when the water is pulled out of the water or a low sedimentation speed when the water is poured into the water.

[0007]

SUMMARY OF THE INVENTION The present invention relates to the above problems in cords and ropes made by the prior art, particularly the problem of fibrillation of fibers due to friction between fibers and other objects, and the strong deterioration in water. The purpose of the present invention is to improve the problem of sedimentation in water and the problem of poor sedimentation in water caused by the specific gravity of cords, and to provide a rope-like rope with good abrasion resistance, strength in water and sedimentation in water (specific gravity). It is.

[0008]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, the surface of a twisted or braided organic high-performance heat-resistant fiber is made non-water-absorbing, abrasion-resistant and flexible. By covering with a thermoplastic resin coating rich in water, braiding or twisting metal fibers together to control the specific gravity, or mixing metal or metal compound powder in the thermoplastic resin, By braiding using a plurality of cords with enhanced properties, it has been found that a rope-like rope-like material excellent in abrasion resistance, flexibility, water strength, and sedimentation required by the market can be obtained, and the present invention It has been reached.

That is, according to the present invention, an organic fiber having a thermal decomposition initiation temperature of 310 ° C. or more, a tensile strength of 18 g / de or more and a tensile elongation of 8% or less is braided or twisted with a coefficient of 0.5 to 7 or less. A rope for a longline, wherein a fiber structure twisted at 2.0 is used as a core material, and the surface of the core material is woven using a plurality of resin-coated cords formed by coating with a thermoplastic resin film. An article is provided.

According to the present invention, the thermal decomposition onset temperature is 3
A mixed braid or a combination braid of an organic fiber having a tensile strength of 18 g / de or more and a tensile elongation of 8% or less and a metal fiber having a specific gravity of 4 or more, or a twist coefficient of 0.7 to 5.0. Using a mixed twisted fiber structure as the core material,
There is provided a rope for longline, characterized in that a plurality of resin-coated cords whose core material surfaces are covered with a thermoplastic resin are used.

Further, according to the present invention, a metal fiber having a specific gravity of 4 or more is used as a core, and the surface thereof has a thermal decomposition initiation temperature of 310.
The core material is constituted by a core-sheath fiber structure braided with an organic fiber having a tensile strength of 18 g / de or more and a tensile elongation of 8% or less, the surface of which is coated with a thermoplastic resin. The present invention provides a long-line rope-shaped article characterized by being tied using a plurality of resin-coated cords covered by a cord. Hereinafter, the present invention will be described more specifically.

In the present invention, the rope-like material covered with a resin film is used for the same purpose as a rope, in addition to a general fiber rope mainly composed of a fiber material having a resin-coated surface. This also includes those in which the resin is coated on the fiber cord surface.

The fiber constituting the core part of the rope-like material according to the present invention has a thermal decomposition temperature of 310 ° C. or higher and a tensile strength of 1%.
Any organic fibers having a property of 8 g / de or more and a tensile elongation of 8% or less may be used, but usually, the thermal decomposition temperature is 400 to 550 ° C. and the tensile strength is 20 to 45 g.
/ De and an organic fiber having a tensile elongation of 2 to 6% are preferable. Specific examples thereof include aramid fiber (for example, “Kevlar (registered trademark)” manufactured by DuPont Co., Ltd., “Technola” manufactured by Teijin Limited) (Registered trademark name) "
Etc., but Technola is more preferable from the viewpoint of abrasion resistance), aromatic polyester fiber (for example, "Vectran (registered trademark)" manufactured by Kuraray Co., Ltd.), and PBO fiber (for example, manufactured by Toyobo Co., Ltd.) And the like, and among them, aramid fiber is particularly preferable in terms of frictional heat resistance and thermal dimensional stability. The single yarn fineness of these fibers is 0.3 to 20.0.
Denier is preferred, and more preferably 0.5 to 15.0.
Denier. If the denier is less than 0.3 denier, the single yarn fibers tend to break due to friction and wear with other objects, and the uniformity of the single yarn fibers in the strand (fiber aggregate) is reduced, resulting in a high load. When used, the stress concentration tends to occur at a specific location, and the high strength inherent in the fiber assembly cannot be exhibited. On the other hand, the single yarn fineness is 20.
If it exceeds 0 denier, the flexibility of the fiber assembly is impaired, which is not preferable.

Further, in addition to the above-mentioned organic fibers, metal fibers having a specific gravity of 4.0 or more, preferably 5.0 to 20, may be used in combination with the core material of the rope-like material for longlines. By doing so, the sedimentability of the obtained rope-shaped material in water is improved, and the rope-shaped material is suitable for fishing nets, longlines, and the like in the field of marine materials. Examples of the preferably used metal fiber include a copper wire, a steel wire, a stainless wire, a piano wire, a tungsten wire, a molybdenum wire, and the like, and a copper wire and a stainless wire are particularly preferable in terms of cost, flexibility, corrosion, and the like. . With a metal fiber having a specific gravity of less than 4.0, the specific gravity of the fiber assembly as a whole obtained by mixing the organic fiber with the mixed braid or the combination braid or the mixed twist cannot be sufficiently increased, and the effect of improving the sedimentation property is not sufficient. Will be enough. The outer diameter of these metal fibers is preferably from 0.03 to 0.40 mm, more preferably from 0.05 to 0.2 mm. When the outer diameter is less than 0.03 mm, it is easy to cut at the time of ply-twisting with an organic fiber or at the time of mixed braiding, thereby deteriorating workability and making it difficult to obtain a desired mixed fiber structure. On the other hand, 0.
If it exceeds 40 mm, the difference in flexibility from the organic fiber becomes too large, making it difficult to produce a good mixed-twisted structure or a mixed braided structure, and further, the flexibility of the obtained fiber structure is reduced. As a result, the abrasion resistance deteriorates. In addition, from the viewpoint of the flexibility and abrasion resistance of the obtained fiber rope, the mixing ratio of the metal fiber with the metal fiber is based on the total weight of the organic fiber and the metal fiber constituting the core part. Is desirably in the range of 5 to 50% by weight, preferably 10 to 30% by weight.

In the present invention, the above-mentioned organic fibers having high strength and low elongation characteristics are used alone or in combination with the above-mentioned metal fibers to have a braided structure or a core-sheath structure, or a twist coefficient of 0.5. It is most suitable to use as a core material in a ply-twisted structure twisted in the range of 5 to 7.0, preferably 1.0 to 2.0. When used in a twisted yarn structure having a low number of twists, the core material is difficult to maintain a circular shape, so that it becomes easy to become flat in the surface coating step with a thermoplastic resin, and resin cracks and the like also occur. This is not preferable because it becomes difficult to obtain a fiber rope having a core-sheath structure uniformly covered with a thermoplastic resin film. On the other hand, in the ply-twisted yarn structure having a high twist number of more than 7.0, the tensile strength of the obtained fiber rope is reduced, and the high strength characteristic of organic fibers is reduced. It is not preferable because it cannot be fully utilized. In addition, a braided structure is more preferable than a twisted yarn structure because the wear resistance is improved. When metal fibers are used in combination, a braided structure having a core-sheath structure in which metal fibers are used as a core and the surface thereof is braided with organic fibers is preferable from the viewpoint of improving wear resistance.

The thermoplastic resin used for the surface coating is not particularly limited, but a polyamide resin such as nylon 12, nylon 610 or the like or a urethane resin is preferable from the viewpoint of abrasion resistance and flexibility.

The core material is heated so that the volume fraction (Vf) of the core material in the resin-coated cord is in the range of 0.05 to 0.90, preferably 0.2 to 0.80. It is desirable to coat with a plastic resin. The method of coating is not particularly limited, but for example, a method in which a core material is immersed in a molten thermoplastic resin and passed therethrough is generally preferable. In this case, in order to increase the specific gravity of the target substance, a powder of a metal or a metal compound having a specific gravity of 4 or more, preferably 5 to 20 can be mixed in the melt of the thermoplastic resin. In that case, the particle size of the powder is suitably passed through a sieve of 100 mesh, preferably 140 mesh. The powder is usually 0.1 to 20% by weight, preferably 0.3 to 20% by weight of the thermoplastic resin.
It is appropriate to mix in the range of 15% by weight.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a twisted or braided fiber structure made of para-type aramid fiber or polyacrylate fiber which is liable to be fibrillated by friction, and a fiber structure obtained by using metal fibers in combination with the fiber will be described as examples. Will be specifically described with reference to examples. In addition, evaluation of strength, elongation, non-water absorption, specific gravity, abrasion resistance, bending durability, sedimentation in water, etc. was measured according to the following method.

1) Evaluation of strength and elongation Using a constant speed elongation type tensile tester, JIS standard, L-101
3 was measured. However, the measurement chuck used was a steel fiber chuck.

2) Evaluation of Thermal Decomposition Onset Temperature The weight loss onset temperature was measured at a heating rate of 10 ° C./min using a thermogravimeter (thermobalance).

3) Evaluation of Non-Water Absorption (Evaluation of Water Absorption) The surface is coated with a resin-coated fiber rope or a resin for comparison in which the terminal is sealed with a resin similar to the surface coating resin so that moisture does not enter from the terminal. Approximately 50 g of a sample of a rope-shaped material that has not been subjected to filtration is collected and dried in a dryer at a temperature of about 100 to 105 ° C.
Dry for 0-60 minutes. Next, the sample was heated to a temperature of 20 ±
It is placed in a desiccator adjusted to 2 ° C. and a relative humidity of 85 ± 3% RH, left for two days or more to allow sufficient water absorption, and then weighed (W1). Thereafter, the sample was dried in a dryer at 105 ± 2 ° C. for 120 minutes, and immediately weighed (W
2) Then, the water absorption was calculated by the following formula. It was determined that the smaller the value, the better the non-water absorption. Water absorption (%) = {weight before drying (W1) -weight after drying (W2)} / weight after drying (W2) × 100

4) Measurement method of specific gravity The specific gravity was measured by a density gradient tube method according to ASTM, D1505-63T. The measurement temperature was 25 ° C., and the measurement solution was a mixed solution of n-heptane and carbon tetrachloride.

5) Wear resistance evaluation method A FIG. 1 shows an evaluation apparatus. In FIG. 1, 1 has an outer diameter of 0.8.
mm tensioned piano wire, 2 a load, and 3 a resin-coated fiber rope sample for evaluation. After a load of 0.2 g / denier was attached to one end of the evaluation sample 3, the other end of the evaluation sample was reciprocated to determine the number of reciprocations until the rope sample 3 was cut by friction with the piano wire 1. It was measured.

6) Wear resistance evaluation method B FIG. 2 shows an evaluation apparatus. In the figure, 4 is a roll having an outer diameter of 20 mm which freely rotates, 5 is a roll having an outer diameter of 10 mm which is also free to rotate, 6 is a resin-coated fiber rope sample for evaluation, and 7 is a roll for evaluation. A pad for allowing water to intervene in the rope sample, 8 is seawater, and 9 is a load. The abrasion was evaluated by twisting the resin-coated fiber rope sample 6 1.5 times and applying it to a roll 4 partially immersed in seawater as shown in FIG. A load of 0.2 g / denier is attached to one end of the rope, and then the other end of the rope sample is reciprocated, and the resin-coated fiber ropes for evaluation are cut by friction and wear mutually at a twisted place. The number of reciprocations up to that point was measured.

7) Method of evaluating sedimentation in water A rope sample having a length of 5 cm was vertically dropped from a water surface into a water tank having a depth of 1 m, and the rope sample having the depth of 1 m was obtained. The time to reach the bottom of the lower aquarium (the time to settle to a depth of 1 m) was measured.

Examples 1 to 3 Thermal decomposition starting temperature of 485 ° C. consisting of 1500 denier / 1000 filaments to which an oil agent is attached, tensile strength of 28
g / denier, two para-type aramid fibers having a tensile elongation of 4.5% (Technola: manufactured by Teijin Limited) are aligned and twisted in the Z direction at a twist coefficient shown in Table 1 to obtain a plied yarn structure. ,
After being guided into a resin coating die of an extruder, where a nylon 12 resin (Daiamide: manufactured by Daicel Corporation) is coated on the surface of the plied yarn structure, a braid (1 ×
8) Then, a rope-shaped (braided structure) was prepared. The obtained rope-shaped material was evaluated for tensile strength, non-water absorption, and abrasion resistance (A and B). The results were as shown in Table 1.

Examples 4 to 6 Thermal decomposition starting temperature of 485 ° C. consisting of 1000 denier / 667 filaments to which an oil agent is adhered, and tensile strength of 28 g
Four denier / para-aramid fibers of 4.5% tensile elongation (Technola: manufactured by Teijin Limited) were aligned and twisted in the Z direction with a twist coefficient shown in Table 1 to obtain a ply-twisted yarn structure. Except for this, after coating with a thermoplastic resin in the same manner as in Example 1, a braid (1 × 6) was formed by six strokes to form a rope-shaped (braided structure). About the obtained rope-shaped material, the result evaluated similarly to Example 1 is as showing in Table 1.

Example 7 Thermal decomposition onset temperature of 485 ° C. consisting of 1000 denier / 667 filaments to which an oil agent is attached, tensile strength of 28 g
Using a para-type aramid fiber (Technola: manufactured by Teijin Limited) having a denier of 4.5% and a tensile elongation of 4.5%, the braid was braided (1 × 4) with four strokes to prepare a braided (braided) structure. Except having used this braided structure as a core material, it carried out similarly to Example 4, and obtained the rope-shaped (braid) thing whose core material consisted of a braided structure. About the obtained rope-shaped material, the result evaluated similarly to Example 1 is as showing in Table 1.

Example 8 The same procedure as in Example 4 was carried out except that a urethane resin (Mobilon; manufactured by Nisshinbo Co., Ltd.) was used as the surface coating resin.
A rope having a core portion composed of a twisted yarn structure was obtained. The results of evaluation of this sample in the same manner as in Example 1 are as shown in Table 1.

Example 9 Except for using a polyarylate fiber (Vectran, manufactured by Kuraray Co., Ltd.) having a thermal decomposition temperature of 475 ° C. consisting of 1000 denier / 200 filaments, a tensile strength of 25.5 g / denier, and a tensile elongation of 3.7%. Is performed in the same manner as in Example 4.
A rope having a core portion composed of a twisted yarn structure was obtained. The results of evaluation of this sample in the same manner as in Example 1 are as shown in Table 1.

[0031]

[Table 1]

Comparative Example 1 A core material was prepared in the same manner as in Example 1 except that two para-type aramid fiber yarns used in Example 1 were aligned and used as a core material without substantially twisting. Was obtained. The results of evaluating this sample in the same manner as in Example 1 are as shown in Table 2.

Comparative Examples 2 and 3 In Comparative Example 2, the twist coefficient of the twisted yarn structure used for the core material was 0.3.
Comparative Example 3 and Comparative Example 3 were carried out in the same manner as in Example 1 except that the yarn was twisted to 8.0, to obtain a resin-coated fiber rope having a core portion having a ply-twisted yarn structure. The results of evaluating the obtained resin-coated fiber rope in the same manner as in Example 1 are as shown in Table 2.

Comparative Examples 4 to 6 The fibrous structures prepared in Examples 4 to 6 before the surfaces were coated with resin were evaluated in the same manner as in Example 1, and the results are shown in Table 2.
As shown in FIG.

[0035]

[Table 2]

Examples 10 to 12 Thermal decomposition starting temperature of 485 ° C. consisting of 1500 denier / 1000 filaments to which an oil agent is adhered, tensile strength of 28
g / denier, two para-type aramid fibers having a tensile elongation of 4.5% (Technola: manufactured by Teijin Limited) and an outer diameter of 0.1
A single 8 mm copper wire is aligned and twisted in the Z direction with a twist factor shown in Table 3 to guide a ply-twisted structure into a resin coating die of an extruder. : Daicel Co., Ltd.) was coated on the surface of the twisted yarn structure, and then braided (1 × 8) by 8 strokes to prepare a rope-like (braided structure). About the obtained rope-shaped material, tensile strength, non-water absorption, abrasion resistance (A and B), and sedimentation in water were evaluated. The results were as shown in Table 3.

Examples 13 to 15 The pyrolysis starting temperature of 485 ° C. consisting of 1000 denier / 667 filaments used in Example 4 and a tensile strength of 28 g /
Using denier, para-type aramid fiber having a tensile elongation of 4.5% (Technola: manufactured by Teijin Limited), four fibers and an outer diameter of 0.4%.
After coating with a thermoplastic resin in the same manner as in Example 10 except that four 12-mm copper wires were aligned and twisted in the Z direction at a twist factor shown in Table 3 to obtain a ply-twisted structure, 6 strokes were performed. To form a rope (braided structure).
The results of the evaluation of the obtained rope-like material in the same manner as in Example 10 are as shown in Table 3.

Example 16 The thermal decomposition onset temperature of 485 ° C. consisting of 1000 denier / 667 filaments used in Example 7 and a tensile strength of 28 g /
Denier, 4 para-type aramid fibers with 4.5% tensile elongation (Technola: Teijin Limited) and 0.12 mm in outer diameter
And braided (2 × 4) by four strokes using the four copper wires of the above (1) to prepare a braided (braided) structure. Except that this was used for a core part, it carried out similarly to Example 10, and obtained the rope-shaped thing whose core material has a braided structure. The obtained rope-like material was evaluated in the same manner as in Example 10, and the results are as shown in Table 3.

Example 17 The procedure of Example 13 was repeated, except that a urethane resin (Mobilon; manufactured by Nisshinbo Co., Ltd.) was used as the surface coating resin.
A rope having a core portion composed of a twisted yarn structure was obtained. The results of evaluation of this sample in the same manner as in Example 10 are as shown in Table 3.

Example 18 A thermal decomposition temperature of 475 ° C. consisting of 1000 denier / 200 filaments, a tensile strength of 25.5 g / denier, and a tensile elongation of 3.7%, except that polyarylate fibers (Vectran; manufactured by Kuraray Co., Ltd.) were used. Was carried out in the same manner as in Example 13 to obtain a rope-like material in which the core portion was made of a ply-twisted structure.
The results of evaluation of this sample in the same manner as in Example 10 are as shown in Table 1.

Examples 19 to 27 The same procedure as in Examples 10 to 18 was carried out except that 10% of copper powder having a particle size of 80 mesh was mixed into the surface coating resin, and a rope having a core portion composed of a twisted yarn structure was used. A product was obtained.
The results of evaluation of this sample in the same manner as in Example 10 are as shown in Table 3.

[0042]

[Table 3]

[0043]

As described above, the rope-like material for longline according to the present invention uses, as a core material, a fibrous structure obtained by twisting or braiding high-strength, low-elongation organic fibers having excellent heat resistance. Since a plurality of resin-coated cords whose surfaces are coated with a thermoplastic resin having excellent abrasion resistance, non-water absorbability and good flexibility are further used, the cord has the following characteristics. 1) Because it is highly powerful for its thickness, it can be thinned,
Shipping space can be reduced. 2) Excellent wear resistance in air and seawater. 3) Since the specific gravity is easy to control, the sedimentation speed is easy to control. 4) It is non-water-absorbing, has good drainage properties, and is excellent in workability. Therefore, the rope-like material for longline of the present invention is extremely useful as a cord or a rope-like material used in the field of marine materials such as for longline.

[Brief description of the drawings]

FIG. 1 is a schematic side sectional view of an evaluation device used in a wear resistance evaluation method A.

FIG. 2 is a schematic side sectional view of an evaluation device used in a wear resistance evaluation method B.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 Piano wire having a circular cross section with a diameter of 0.8 mm 2 Load 3 Sample for evaluation 4 Roll that freely rotates with an outer diameter of 20 mm 5 Roll that freely rotates with an outer diameter of 10 mm 6 Sample for evaluation 7 Pat 8 Seawater

Claims (6)

[Claims] 1. A fiber obtained by braiding or twisting an organic fiber having a thermal decomposition onset temperature of 310 ° C. or more, a tensile strength of 18 g / de or more and a tensile elongation of 8% or less with a twist coefficient of 0.5 to 7.0. A rope-shaped article for longline, wherein the structure is used as a core material, and the core material surface is tied using a plurality of resin-coated cords each of which is coated with a thermoplastic resin film. 2. A mixed braid or a combination braid of an organic fiber having a thermal decomposition initiation temperature of 310 ° C. or more, a tensile strength of 18 g / de or more and a tensile elongation of 8% or less and a metal fiber having a specific gravity of 4 or more, or A fiber structure mixed and twisted with a twist coefficient of 0.7 to 5.0 is used as a core material, and the surface of the core material is woven using a plurality of resin-coated cords coated with a thermoplastic resin. A rope-like object for a longline. 3. A metal fiber having a specific gravity of 4 or more as a core, the surface of which has a thermal decomposition initiation temperature of 310 ° C. or more and a tensile strength of 1
A resin comprising a core-sheath fiber structure braided with an organic fiber having an elongation of 8 g / de or more and a tensile elongation of 8% or less, wherein the surface of the core is covered with a thermoplastic resin film. A longline rope-shaped article, which is formed by using a plurality of coated cords. 4. The longline rope according to claim 1, wherein the thermoplastic resin film coated on the core material is a film made of a polyamide-based resin or a urethane-based resin. Stuff 5. A thermoplastic resin film coated on a core material is a film made of a polyamide resin or a urethane resin, and a powder of a metal or a metal compound having a specific gravity of 4 or more is compounded in the thermoplastic resin. The long rope rope-like article according to any one of claims 1, 2 and 3, wherein: 6. The rope according to claim 1, wherein the organic fiber is a wholly aromatic polyamide fiber, a wholly aromatic polyester fiber, or a PBO fiber.