JP2010168700A - Thread - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thread which can be suitably used as a fishing line which has much smaller ductility and much larger mechanical strength, is excellent in wear resistivity, anti-cutting property or the like, and has a freely changeable specific gravity. <P>SOLUTION: The thread comprises as follows. A thread body includes a core thread consisting of an ultrahigh molecular weight polyethylene filament whose weight-average molecular weight is 200,000 or more, and a coating layer which coats the periphery thereof and consists of an ultrahigh molecular weight polyethylene whose weight-average molecular weight is 200,000 or more, and is heated by the temperature which is the melting point of the ultrahigh molecular weight polyethylene or higher so as to be stretched. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a yarn that has low elongation, high mechanical strength, excellent wear resistance, cutting resistance, and the like, and that can be suitably used as a fishing line.

  In recent years, as fishing methods for fishing have become more sophisticated, higher performance has been demanded for fishing lines. One example of such high performance is a reduction in elongation. The smaller the elongation, the more accurately the fish faith can be taken, because it is directly reflected in the fishing results. However, when the elongation of the yarn is lowered, there is a problem that wear resistance, cutting resistance, and the like are lowered. That is, decreasing the elongation results in the generation of fibrils, and therefore the wear resistance, cutting resistance, and the like decrease.

  In addition, as a conventional fishing line, there is only a fishing line having a specific gravity of the material. On the other hand, the market is not limited to the specific gravity of the material, but wants to change the specific gravity of the fishing line in response to changes in the weather and tides, and to provide a fishing line with a slightly different specific gravity of the fishing line. There was a request.

  As a fishing line that satisfies these requirements, conventionally, a braid that includes at least an ultrahigh molecular weight polyethylene filament having a molecular weight of 200,000 or more as a low elongation fishing line, and the filament constituting the braid is lower than the melting point of the ultra high molecular weight polyethylene filament. It is integrated by fusing using a heat-adhesive resin having a melting point, and a fishing line made of braid having an elongation of 4% or less and the braid around the braid are made of high-density polyethylene, polypropylene, or ethylene vinyl acetate. Polyolefin resins such as polymers or modified products thereof, polyamide resins such as nylon or copolymer nylon, acrylic resins or copolymerized modified products thereof, polyurethane resins, polystyrene resins, vinyl acetate resins, polyvinyl chloride resins, epoxy resins, etc. Fishing line coated with coating resin (eg Patent Document 1.) Has been proposed, it is described that may contain a metal powder or a metal filament ultra high molecular weight polyethylene filament and the coating resin.

  Compared with the conventional fishing line, the said fishing line has small elongation, large mechanical strength, abrasion resistance, cutting resistance, etc., and specific gravity can also be changed freely. However, currently, there is a demand for a fishing line having a lower elongation, a higher mechanical strength, and an excellent wear resistance, cutting resistance, and the like.

Japanese Patent No. 4,054,646 Japanese Patent Laid-Open No. 55-5228 JP-A-55-107506

  In view of the above-mentioned drawbacks, the object of the present invention is suitable as a fishing line having a lower elongation, a higher mechanical strength, a more excellent wear resistance, a cutting resistance, etc., and a specific gravity that can be freely changed. It is to provide a usable thread.

That is, the present invention
[1] A filamentous body comprising a core yarn made of an ultrahigh molecular weight polyethylene filament having a weight average molecular weight of 200,000 or more and a coating layer covering the periphery thereof and made of ultrahigh molecular weight polyethylene having a weight average molecular weight of 200,000 or more. A yarn characterized by being heated and stretched at a temperature equal to or higher than the melting point of high molecular weight polyethylene;
[2] The yarn according to [1], wherein the core yarn is a twisted yarn obtained by twisting an ultrahigh molecular weight polyethylene filament,
[3] The yarn according to the above [1], wherein the core yarn is a string yarn including an ultrahigh molecular weight polyethylene filament and / or a twisted yarn obtained by twisting the ultrahigh molecular weight polyethylene filament,
[4] The yarn according to any one of [1] to [3], wherein the core yarn includes a filament other than the ultrahigh molecular weight polyethylene filament,
[5] The yarn according to [4], wherein the other filament contains metal particles,
[6] The yarn according to any one of [1] to [5], wherein the outer periphery is coated with a resin layer.
[7] The yarn according to [6], wherein the resin layer contains metal particles [8] The draw ratio in heat drawing is 2 to 10 times, 1] to [7]
[9] The yarn according to any one of [1] to [8], wherein a heating temperature in the heat drawing is 150 to 170 ° C.
[10] The yarn according to any one of [1] to [9], wherein the elongation of the yarn is 4% or less,
[11] The yarn according to any one of [1] to [10] above, wherein the strength after 1000 times of wear in the yarn wear test is 12.3 cN / dtex or more, 12] A fishing line comprising the yarn according to any one of [1] to [11].

  The configuration of the yarn of the present invention is as described above, and has low elongation, high mechanical strength, and excellent wear resistance, cutting resistance, and the like. Moreover, specific gravity can be changed freely and it can be used conveniently as a fishing line.

It is the schematic of the test apparatus used for an abrasion resistance test.

  The core yarn used in the present invention is composed of an ultrahigh molecular weight polyethylene filament having a weight average molecular weight of 200,000 or more. In the present invention, the weight average molecular weight is a value measured by gel permeation chromatography (GPC).

  The ultra high molecular weight polyethylene constituting the ultra high molecular weight polyethylene filament may be a homopolymer of ethylene, or lower α-olefins mainly composed of ethylene and having about 3 to 10 carbon atoms, such as propylene, butene, pentene, It may be a copolymer with hexene or the like. In the copolymer of ethylene and α-olefin, the proportion of α-olefin is preferably about 0.1 to 20 on average per 1000 carbon atoms, more preferably about 0.5 to 10 on average. When the weight average molecular weight of the ultra high molecular weight polyethylene is decreased, the mechanical strength, wear resistance, cutting resistance and the like are decreased and the elongation is increased, so that it is 200,000 or more, preferably 300,000 to 1.6 million.

  The thickness of the ultrahigh molecular weight polyethylene filament is not particularly limited, but is generally preferably 0.4 to 11 dpf. Moreover, the manufacturing method of an ultra high molecular weight polyethylene filament is not specifically limited, What is necessary is just to manufacture with the conventionally well-known arbitrary manufacturing methods (for example, refer patent document 2, 3).

  Examples of ultrahigh molecular weight polyethylene filaments are commercially available under the trade names “Dyneema” (registered trademark, manufactured by Toyobo Co., Ltd.), “Spectra” (registered trademark, manufactured by Honeywell), and the like.

  The core yarn used in the present invention is composed of the above ultra-high molecular weight polyethylene filament, but it may be composed of a single filament or a plurality of filaments. It is preferable that it is comprised from these. Moreover, although the thickness is not specifically limited, 10-20,000 dtex is preferable.

  When the core yarn is composed of a plurality of filaments, it may be an aligned yarn obtained by simply aligning a plurality of filaments, or a twisted yarn obtained by twisting the aligned filaments. It may be a string-making yarn obtained by stringing a filament and / or the twisted yarn.

The twisted yarn has a twist coefficient K of preferably about 0.2 to 1.5, more preferably about 0.3 to 1.2, and still more preferably about 0.4 to 0.8. In order to maintain wear resistance, the twist coefficient is preferably about 0.2 or more, and in order to reduce the elongation of the yarn, the twist coefficient is preferably about 1.5 or less. The twist coefficient K is the following formula:
K = t × D ^1/2 (where, t: number of twists (times / m), D: fineness (tex))
Is calculated by The fineness in the equation is a value measured according to JIS L 1013 (1999).

  Moreover, it is preferable that the braided yarn is formed with a braid angle of about 5 ° to 90 °, more preferably about 5 ° to 50 °, and further preferably about 20 ° to 30 °. . In order to maintain wear resistance, the braid angle is preferably about 5 ° or more, and in order to reduce the elongation of the yarn, the braid angle is preferably about 90 ° or less. Therefore, the number of filaments and / or twisted yarns used for the string is 4, 8, 12, 16, 32, and the like. The angle of assembly can be measured using a digital HD microscope VH-7000 (manufactured by Keyence Corporation). The manufacturing method of the string-making yarn is not particularly limited, and is generally performed by supplying the filament and / or the twisted yarn to a braiding machine (string-making machine).

  The core yarn used in the present invention may contain a filament other than the ultra high molecular weight polyethylene filament (hereinafter, abbreviated as “other filament”) within the range allowed by the physical properties.

  Examples of the other filament include a filament made of a thermoplastic resin such as a polyolefin resin, a polyamide resin, a polyester resin, a fluorine resin, a polyacrylonitrile resin, a polyvinyl alcohol resin, a polyacetal resin, and a metal filament. Can be mentioned.

  Examples of the polyolefin resin include polyethylene resins other than the ultra high molecular weight polyethylene, polypropylene resins, and the like. The polypropylene resin preferably has a polymerization average molecular weight of about 400,000 or more. The polyethylene resin and polypropylene resin may be homopolymers or copolymers. The ethylene copolymer is a copolymer of lower α-olefins mainly composed of ethylene and having about 3 to 10 carbon atoms, such as propylene, butene, pentene, hexene, etc., and the proportion of α-olefins is 1000 carbon atoms. An average of about 0.1 to 20 is preferable, and an average of about 0.5 to 10 is more preferable. Moreover, ethylene-vinyl acetate copolymer (EVA) etc. are also mentioned. The propylene copolymer is a copolymer of propylene and a lower α-olefin having about 3 to 10 carbon atoms, such as ethylene, butene, pentene, hexene, etc., and the proportion of α-olefin is 1000 carbon atoms. An average of about 0.1 to 20 is preferable, and an average of about 0.5 to 10 is more preferable.

  Examples of the polyamide resin include aliphatic polyamides such as nylon 6, nylon 66, nylon 12, nylon 6, 10 and the like, copolymers thereof, semi-aromatic polyamides formed from aromatic diamines and dicarboxylic acids, or the like A copolymer etc. are mentioned.

  Examples of the polyester resin include terephthalic acid, isophthalic acid, naphthalene 2,6-dicarboxylic acid, phthalic acid, α, β- (4-carboxyphenyl) ethane, 4,4′-dicarboxyphenyl, and 5-sodium sulfone. Aromatic dicarboxylic acids such as isophthalic acid, aliphatic dicarboxylic acids such as adipic acid and sebacic acid or esters thereof, and diol compounds such as ethylene glycol, diethylene glycol, 1,4-butanediol, polyethylene glycol, and tetramethylene glycol And polyesters or their copolymers that are polycondensed.

  Examples of the fluorine-based resin include polyvinylidene fluoride resin, polytetrafluoroethylene resin, polymonochlorotrifluoroethylene resin, polyhexafluoropropylene resin, and copolymers thereof.

  Examples of the polyacrylonitrile-based resin include polyacrylonitrile-based resins that are copolymers of acrylonitrile and other polymers. As said other polymer, a methacrylate, an acrylate, vinyl acetate etc. are mentioned, for example, It is preferable that this other polymer is contained in the ratio of about 5 weight% or less.

  As said polyvinyl alcohol-type resin, the polyvinyl alcohol-type resin which is a copolymer of vinyl alcohol and another polymer is mentioned. Examples of the other polymer include polyvinyl acetate, polyethene, and other polyalkenes. The other polymer is preferably contained at a ratio of about 5% by weight or less.

  Examples of the polyacetal resin include polyacetal resins having an acetal bond in the main chain such as polyoxymethylene. The polyacetal resin filament can be produced by a method known per se, such as melt spinning of a polyacetal resin.

  The other filament made of the thermoplastic resin may be a highly creepable filament. The high creep property filament refers to a filament that keeps its shape after stretching. More specifically, the permanent elongation is preferably about 1% or more, more preferably about 5% or more, and still more preferably when a load half of the breaking strength of the filament is continuously applied for 100 hours and then the load is removed. About 10% or more. The permanent elongation is measured according to JIS L 1013 (1992) in the same manner as measuring the elongation using a universal testing machine Autograph AG-100kNI (trade name, manufactured by Shimadzu Corporation).

  Accordingly, as the other filaments, polyacetal resin filaments are preferable, and those having a tensile strength of about 3.5 cN / dtex or more and an elongation of 20% or less are preferable. The tensile strength and elongation can be measured in the same manner as described above.

  Examples of the metal filament include metal filaments such as copper, iron, stainless steel, lead, tin, nickel, cobalt, gold, silver, and platinum.

  The other filaments made of the thermoplastic resin may contain metal particles. By containing the metal particles, a filament having an arbitrary specific gravity, particularly a filament having a large specific gravity can be obtained regardless of the specific specific gravity of the material constituting the filament. The manufacturing method of the other filament containing a metal particle is not specifically limited, For example, it can manufacture easily by producing the mixed composition containing a metal particle and a thermoplastic resin, and carrying out melt spinning.

  Examples of the metal particles include those in which iron, copper, zinc, tin, nickel, tungsten and the like are used alone, or mixed or alloyed. Among them, tungsten is preferable because it is easy to give weight, suppresses a decrease in strength as much as possible, and raises the effect of increasing the specific gravity with a small amount of addition. The average particle diameter of the metal particles is not particularly limited, but if it is too large, uniformity is poor, and therefore it is preferably 20 μm or less, and more preferably 10 μm or less. Moreover, the addition amount is preferably 1 to 90 parts by weight, more preferably 5 to 70 parts by weight with respect to 100 parts by weight of the thermoplastic resin.

  Further, the other filaments made of the thermoplastic resin may have a hollow structure. A buoyancy can be given to a filament (yarn) by making other filaments into a hollow structure. In addition, by adjusting the hollow size or the like, or by further containing metal particles as described above, the balance between the weight of the yarn and the buoyancy when the yarn is used in a liquid such as water or seawater can be obtained. Can be set arbitrarily. As a result, for example, when the yarn according to the present invention is used as a fishing line or fishery material, the settling speed of the yarn in water or seawater can be controlled.

  In order to impart a hollow structure to the filament, the filament may be produced using a melt spinning apparatus equipped with a spinneret for hollow fibers that can form a desired number of hollows during melt spinning. In the case where there is one hollow, the cross section of the filament becomes partially flat at the time of production, and the strength of the filament may be lowered. Therefore, it is preferable that there are two or more hollows. By having a structure having two or more cavities, there is an advantage that a decrease in the strength of the filament can be prevented. The number of hollows is not particularly limited, and can be appropriately set to, for example, two, three, four, five, six, seven, eight, nine.

  When the core yarn is composed of a plurality of filaments, an oil agent may be applied around the filament. By applying an oil agent, damage to the filament during stretching can be reduced. Moreover, since the adjacent filaments are not substantially fused by applying the oil agent, it is possible to prevent the molecular orientation in the filaments from being reduced. As a result, the tensile strength and knot caused by the fusion can be prevented. There is an advantage that it is possible to prevent a decrease in strength, friction fastness and the like.

  The oil agent is not particularly limited as long as it is commonly used for imparting to fibers, and examples thereof include sizing resins (binders), base lubricant oils, surfactants, and mixtures thereof. Examples of the converging resin include polyurethane resin, silicon resin, and fluorine resin. Examples of the base lubricating oil include dimethylpolysiloxane and polyether. Examples of the surfactant include higher alcohol, higher alcohol fatty acid ester, polyoxyethylene / higher alcohol ether, polyoxyethylene / higher fatty acid ester, polyethylene glycol / higher fatty acid ester, polyoxyethylene / alkylamino ether, polyoxyethylene / Castor oil ether, alkyl phosphate ester salt (preferably alkali metal salt or amine salt), polyoxyethylene alkyl ether phosphate ester salt (preferably alkali metal salt or amine salt), alkylsulfonate sodium salt, etc. .

  Examples of the polyurethane resin include a polymer obtained by a reaction between a polyether polyol and a polyisocyanate or a reaction between a polycarbonate polyol and a polyisocyanate, and among them, a polycarbonate polyol from the viewpoint of water resistance and heat resistance. A polymer obtained by the reaction of polyisocyanate with polyisocyanate is preferred. Examples of the polyisocyanate include aliphatic or aromatic polyisocyanates such as hexamethylene diisocyanate, xylylene diisocyanate, isophorone diisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, triphenylmethane triisocyanate, and naphthylene diisocyanate. From the viewpoint of properties, aliphatic polyisocyanates are preferred.

  Examples of the silicon-based resin include those having a siloxane bond in the basic skeleton. Among them, hydrogen, an alkyl group having 1 to 3 carbon atoms, a phenyl group, or these alkoxy groups are bonded to a silicon atom. In particular, dimethylsiloxane is preferred. Furthermore, modified silicone resins such as amino-modified, epoxy-modified, alkylene oxide-modified dimethylsiloxane and mixtures thereof are also preferably used.

  Examples of the fluororesin include, for example, a tetrafluoroethylene polymer, a trifluorinated ethylene polymer, a tetrafluoroethylene / hexafluoropropylene copolymer, a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, Examples thereof include tetrafluoroethylene / hexafluoropropylene / perfluoroalkyl vinyl ether copolymer, vinylidene fluoride polymer, and ethylene / tetrafluoroethylene copolymer. Fluorine resin is usually used in the form of a dispersion in which a fine particle fluorine resin is dispersed in a dispersion medium using a dispersant or an aqueous emulsion in which a fine particle fluorine resin is emulsified in an aqueous medium using an emulsifier. It is preferable to do this.

  The method for applying the oil agent to the core yarn is not particularly limited, and any conventionally known method may be employed.For example, an immersion oil supply method, a spray oil supply method, a roller oil supply method, a guide oil supply method using a metering pump, etc. The immersion oil supply method and the spray oil supply method are preferable.

  The filamentous material used in the present invention includes the core yarn and a coating layer made of ultrahigh molecular weight polyethylene having a weight average molecular weight of 200,000 or more that covers the core yarn. The ultra high molecular weight polyethylene having a weight average molecular weight of 200,000 or more constituting the coating layer is the same as the ultra high molecular weight polyethylene having a weight average molecular weight of 200,000 or more constituting the core yarn, and the weight average molecular weight is the same. It may be different or different. The content of the ultra high molecular weight polyethylene constituting the coating layer in the filamentous body is preferably 1 to 50% by weight, more preferably 1 to 50% by weight because the core yarn cannot be uniformly fixed by coating when the content is too low, and the elongation is lowered when the content is too high. It is 2 to 20% by weight, more preferably 5 to 10% by weight. The coating layer may also contain the metal particles.

  The method for forming the coating layer is not particularly limited. For example, a method in which ultrahigh molecular weight polyethylene is melted with an extruder and extrusion coating is performed on the core yarn, an ultrahigh molecular weight polyethylene solvent solution is prepared, and the core yarn is added to the solution. So-called dipping method or the like is used.

  As a method for forming a coating layer by coating ultra high molecular weight polyethylene on the core yarn by the dipping method, for example, ultra high molecular weight polyethylene is dissolved in decalin (decahydronaphthalene), and a 30-70 wt% decalin solution is prepared There is a method in which the core yarn is soaked in this solution and then pulled up and heated while passing through a mold that defines its thickness to evaporate decalin.

  The filamentous body may be further coated with a resin layer on the outer periphery thereof. The resin (hereinafter referred to as “coating resin”) is not particularly limited as long as it can be in close contact with the filamentous body, but it can withstand long-term outdoor use and has excellent durability characteristics such as friction and bending fatigue. preferable. Further, in order to perform thermal coating without impairing the tensile strength of the filamentous material, a resin having a melt index of 0.1 g / 10 min or more is preferable, and more preferably 0.1 g / 10 min to 1000 g / 10 min. . The melt index is a value measured with a melt indexer (L-202, manufactured by Takara Kogyo Co., Ltd.) by a method according to JIS K 7210 (1976) “Method for testing the flow of thermoplastics”.

  Examples of the coating resin include polyolefin resins such as high density polyethylene, polypropylene, and ethylene vinyl acetate copolymer or modified products thereof, polyamide resins such as nylon and copolymer nylon, acrylic resins or copolymer modified products thereof, and polyurethane. Resins, polystyrene resins, vinyl acetate resins, polyvinyl chloride resins, epoxy resins and the like can be mentioned.

The resin layer may also contain the metal particles, or may have a hollow structure.
Also, the method for forming the resin layer is not particularly limited. For example, the coating resin is melted with an extruder and the outer periphery of the filamentous body is extruded and coated, or the filamentous body is immersed in a molten or solution-like coating resin. For example, a so-called dipping method in which the surplus amount is squeezed out to reduce the excess amount. Furthermore, the coating resin may be applied using a known means such as an applicator, a knife coater, a reverse roll coater, a gravure coater, a flow coater, a rod coater, or a brush.

  Various known antiwear agents, matting agents, modifiers, ultraviolet absorbers, pigments, colorants, magnetic materials, conductive materials are used for the core yarn, coating layer and resin layer as long as the object of the present invention is not impaired. An active substance, a substance having a high dielectric constant, or the like may be added.

  The yarn according to the present invention is characterized in that the filament is heated and stretched at a temperature equal to or higher than the melting point of the ultrahigh molecular weight polyethylene.

  The heating and stretching method is not particularly limited, and any conventionally known method may be employed. For example, stretching by heating with a heater or hot air by a uniaxial stretching method such as a roll uniaxial stretching method or a zone uniaxial stretching method. There may be mentioned a method of performing, and it may be a single-stage stretching or a multi-stage stretching in which stretching is performed twice or more.

  The temperature at the time of drawing varies depending on the type of resin constituting the thread body and the size of its diameter, so it cannot be said unconditionally, but at least at a temperature equal to or higher than the melting point of the ultrahigh molecular weight polyethylene constituting the thread body I do. If the stretching temperature is too high, the filaments melt and break, so the temperature is higher than the melting point of ultrahigh molecular weight polyethylene, preferably 150 to 175 ° C, more preferably 155 to 165 ° C. In addition, when two or more types of ultrahigh molecular weight polyethylene are used in combination and their melting points are different, the stretching treatment is performed at a temperature equal to or higher than the melting point of the lowest melting point.

  The draw ratio is not particularly limited, and may be appropriately determined depending on the physical properties required of the yarn, but generally 2 to 10 times is preferable. In addition, the draw ratio of the thread body stretched by the roll uniaxial stretching method in which the thread body is fed out by the feeding pinch roll, and taken up by the take-up pinch roll and stretched is “the take-up speed of the take-up pinch roll / the feed pinch roll Defined by “feeding speed”.

  Moreover, you may form a taper shape in a thread | yarn by adjusting a draw speed at the time of extending | stretching. Specifically, by increasing the stretching speed, the diameter decreases in the longitudinal direction, and by decreasing the stretching speed, the diameter increases in the longitudinal direction. When the stretching speed is changed as described above, it is preferable that the change in the stretching speed is gradually inclined to increase or decrease. That is, it is preferable to gradually increase or / and gradually decrease the stretching speed during stretching. If the change in the drawing speed is such a gentle change, the drawing speed may or may not change linearly.

  Since the drawing speed at the time of drawing varies depending on the type of the core yarn (filament) and the resin constituting the coating layer, the thickness of the yarn, etc., it cannot be said unconditionally. For example, it is preferable that the ratio between the stretching speed when forming the portion with the largest yarn diameter and the stretching speed when forming the portion with the smallest yarn diameter is about 1: 2 to 6. .

  The elongation of the yarn of the present invention is preferably about 5% or less, more preferably 4.0% or less, still more preferably 3.0% or less, and still more preferably 2.7% or less. For example, when the yarn is a fishing line, the smaller the elongation, the easier it is to catch the fish faith, so the elongation is preferably in the above range. The elongation is a value measured using a universal testing machine Autograph AG-100kNI (trade name, manufactured by Shimadzu Corp.) according to JIS L 1013 (1992).

In the yarn of the present invention, the strength after 1000 times of wear in the wear test is preferably 12.3 cN / dtex or more, more preferably 14.1 cN / dtex or more. The wear test is performed as follows. As a testing machine, as shown in FIG. 1, a seat belt hexagonal bar wear tester is improved and a ceramic guide 2 having a diameter of 9 mm is disposed at the hexagonal bar. The stroke length and angle of the testing machine are in accordance with JIS D 4604 (1995). The sample 1 is passed through the ceramic guide 2, one is fixed to the fixing part 4 of the drum 5, and the load 3 is applied to the other. The load is 3.3% of the maximum strength value of the sample. The drum 5 is reciprocated 1000 times, and the sample is worn with a ceramic guide. And the strength of the worn part is measured. The drum 5 and the crank 7 are connected by a crank arm 6, and the drum 5 is reciprocated by the crank 7.

  From the strength value before wear (a) and the strength value after wear (b), the residual strength value (c) calculated by the following formula: c (%) = b / a × 100 is calculated, and the value of c is high. It is determined that the wear resistance is excellent. The strength value is measured according to JIS L 1013 (1992) with a universal testing machine Autograph AG-100kNI (trade name, manufactured by Shimadzu Corporation).

  The specific gravity of the yarn of the present invention is preferably 1.01 to 10.0. Specific gravity is measured using an electronic hydrometer SD-200L (manufactured by Mirage Trading Co., Ltd.). Further, the fastness to friction of the yarn is preferably grade 3 or higher, more preferably grade 4 or higher. The friction fastness is measured according to JIS L 0849 (1996).

Next, examples of the present invention will be described, but the present invention is not limited to the examples.
Example 1
Four Dyneema 220T / 200F (manufactured by Toyobo Co., Ltd., melting point 134 ° C.) were formed by staking by a stringing machine to obtain a core thread having a thickness of 950.4 dtex. 10 parts of cut pieces obtained by cutting Dyneema 220T / 200F (manufactured by Toyobo Co., Ltd., melting point 134 ° C.) shortly were added and mixed with 90 parts by weight of decalin to obtain a slurry mixture. The obtained slurry-like mixture was put into a screw-type kneader at 220 ° C. and dissolved, and then extrusion-coated around the core yarn obtained at 170 ° C. by a crosshead type extruder, and immediately after that, nitrogen at 100 ° C. Decalin was evaporated in the gas and cooled to obtain a filament having a thickness of 995 dtex coated with ultrahigh molecular weight polyethylene. The obtained filament was heated and stretched at 160 ° C. in a heating oven at a draw ratio of 3 to obtain a yarn having a thickness of 332 dtex.

(Comparative Example 1)
The core yarn obtained in Example 1 was immersed in an acrylic resin emulsion (about 22% by weight) (manufactured by DIC Corporation, trade name “Boncoat 3750”), and then pulled up to evaporate water in nitrogen gas at 100 ° C. By cooling, a filament having a thickness of 1026 dtex coated with ultrahigh molecular weight polyethylene was obtained. The obtained filament was heated and stretched to 160 ° C. in a heating oven at a draw ratio of 3 to obtain a yarn having a thickness of 342 dtex.

(Comparative Example 2)
The core yarn obtained in Example 1 was heat-drawn at 160 ° C. in a heating oven at a draw ratio of 3 to obtain a yarn having a thickness of 317 dtex.
The strength value (a) of the yarn obtained in Example 1 and Comparative Examples 1 and 2 and the strength value (b) of the yarn subjected to the friction test were measured, and the remaining strength value (c) was calculated and displayed. It was shown in 1.

  As described above, the yarn of the present invention has low elongation, high mechanical strength, excellent wear resistance, cutting resistance, etc., and the specific gravity can be freely changed. Therefore, the fishing line, rope, tennis racket And badminton racket guts, bow strings, dial cord strings, etc., and particularly suitable as fishing lines.

1 Test sample 2 Ceramic guide (wear part)
3 Load 4 Fixed part 5 Drum 6 Crank arm 7 Crank

Claims (12)

  A filamentous body comprising a core yarn made of an ultrahigh molecular weight polyethylene filament having a weight average molecular weight of 200,000 or more and a coating layer covering the periphery thereof and made of an ultrahigh molecular weight polyethylene having a weight average molecular weight of 200,000 or more is obtained. A yarn characterized by being heat-drawn at a temperature equal to or higher than its melting point.   The yarn according to claim 1, wherein the core yarn is a twisted yarn obtained by twisting an ultrahigh molecular weight polyethylene filament.   2. The yarn according to claim 1, wherein the core yarn is a string yarn including a super high molecular weight polyethylene filament and / or a twisted yarn obtained by twisting the ultra high molecular weight polyethylene filament.   The yarn according to any one of claims 1 to 3, wherein the core yarn contains a filament other than the ultrahigh molecular weight polyethylene filament.   The filament according to claim 4, wherein the other filament contains metal particles.   Furthermore, the thread | yarn of any one of Claims 1-5 by which the resin layer is coat | covered by the outer periphery.   The yarn according to claim 6, wherein the resin layer contains metal particles.   The yarn according to any one of claims 1 to 7, wherein a draw ratio in heat drawing is 2 to 10 times.   The yarn according to any one of claims 1 to 8, wherein a heating temperature in the heat drawing is 150 to 170 ° C.   The yarn according to any one of claims 1 to 9, wherein the elongation of the yarn is 4% or less.   The yarn according to any one of claims 1 to 10, wherein the strength after 1000 times of wear in a yarn wear test is 12.3 cN / dtex or more.   A fishing line comprising the yarn according to any one of claims 1 to 11.

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