thread

Abstract

To provide a multifilament yarn that improves knot strength and ensures high roundness. [Solution] The multifilament comprises two twists in different directions and a coating resin that coats the surface of the multifilament, with a first twist applied in one direction and a second twist applied in the opposite direction to the first twist without combining with other yarns. The multifilament is primarily composed of ultra-high molecular weight polyethylene or polyarylate, with the ratio of the number of twists between the first twist and the second twist being 1.05 or more and 2.5 or less, and the number of twists for the first twist being 180 to 1000 T / M. The coating resin is a thermoplastic resin, with an amount of coating resin attached being 15 to 50 parts by weight per 100 parts by weight of the filament, and the aspect ratio being 1 or more and 1.25 or less.

Description

[Technical Field]

[0001] The present invention relates to improvements in yarn. [Background technology]

[0002] For example, fishing lines are required to be lightweight and have high strength, and these properties must be maintained for a long period of time. Nylon monofilament has been widely used as fishing line for a long time, but in order to overcome this weakness of high tenacity, various types of covered yarns have been proposed, in which a sheath yarn is wrapped around a core yarn.

[0003] For example, the fishing line shown in Patent Document 1 has been proposed with the aim of providing a fishing line that satisfies these high strength requirements, does not reduce productivity, and does not reduce the abrasion resistance of the fishing line, at an affordable price. This fishing line is a covered thread made by arranging a synthetic fiber multifilament yarn as a core thread and wrapping a synthetic fiber multifilament twisted yarn around it as a sheath thread, and the difference between the angle between the core thread and the sheath thread and the twist angle of the sheath thread is 25° or less. By adopting such a structure, the invention claims to have provided a fishing line that has excellent mechanical properties such as excellent breaking strength and knot strength, low breaking elongation, and also excellent abrasion resistance.

[0004] However, in exchange for obtaining high strength using multifilament (twisted yarn), when fishing using such twisted line, the line often spins and gets tangled in the fishing rod guides.

[0005] In order to solve the above problems with the fishing line shown in Patent Document 1 and to further improve its tensile strength, the device described in Patent Document 2 provides a fishing line that has multiple multifilament yarns and is ply-twisted so that twice the ratio of the number of twists in the first twist to the first twist divided by the number of multifilament yarns is between 1.2 and 2.5. This device suppresses the twisting of the line when fishing with a multifilament yarn (twisted yarn), greatly reducing the inconvenience of the line getting tangled in the fishing rod guides.

[0006] On the other hand, the inventor of the present invention has been conducting research on a daily basis since proposing the above invention to see if it is possible to further improve the knot strength of the thread. Such improvements in knot strength would be of great benefit not only to fishing lines, but also to thread products in general, such as tennis strings, embroidery thread, sewing thread, ropes, threads used as the cores of curled cord-like cell phone straps, and threads used to form fishing nets and safety nets.

[0007] In particular, in the case of fishing lines, even if knot strength is improved, if the roundness decreases (if the flattening ratio increases) (if the cross section of the line becomes flatter), it will emit unnatural reflected light and make fish wary. Furthermore, even if the knot strength is improved, a decrease in roundness may result in a decrease in tensile strength (knot strength). Furthermore, such a decrease in roundness makes the line more susceptible to line trouble, such as tangling in the fishing rod guides. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 11-103737 [Patent Document 2] Japanese Patent Application Laid-Open No. 2006-129863 Summary of the Invention [Problem to be solved by the invention]

[0009] In view of the above problems, the present invention aims to improve the knot strength of the yarn by making a major shift in the concept of twisted yarn, and also aims to improve the knot strength of the yarn without compromising the roundness of the yarn. [Means for solving the problem]

[0010] To solve the above problems, the present invention provides the following yarn. That is, this yarn comprises a multifilament having two twists in different directions and a coating resin that coats the surface of the multifilament. The multifilament has a first twist in one direction and, without doubling with other yarns, a second twist in the opposite direction to the first twist. The thickness of each of the multiple single yarns that make up the multifilament is 0.8 dtex to 2.5 dtex, the ratio of the number of twists in the first twist to the number of twists in the second twist is 1.05 to 2.5, and the number of twists in the first twist is 180 to 1,000 T / M, the coating resin is a thermoplastic resin, the amount of the coating resin applied is 15 to 50 parts by weight per 100 parts by weight of the filament, and the aspect ratio is 1 to 1.25. The term "yarn" as used herein includes not only yarn as a final product but also semi-finished yarn. For example, semi-finished products include those that are further coated with resin to complete the yarn for a specific purpose. A multifilament is made up of multiple single yarns, and a single yarn is an individual single fiber that makes up the multifilament, and such a single yarn is also called a monofilament. The ratio of the number of twists mentioned above refers to the number of twists of the first twist when the number of twists of the second twist is set to 1. It should be noted that T / M indicates the number of turns per meter. That is, the number of turns in the first twist is set to 180 to 1000 per meter. The flattening ratio here refers to the ratio of the major axis to the minor axis of the circle that defines the outline of the cross section of the yarn, and the closer it is to 1, the higher the circularity. In the present invention, the multifilament is mainly composed of ultra-high molecular weight polyethylene or polyarylate. Furthermore, the present invention has made it possible to provide a yarn in which the above-mentioned coating resin is attached to or impregnated into the surface of the multifilament or between the single yarns that make up the multifilament. [Effects of the Invention]

[0011] The inventions of the present application have improved the knot strength of multifilament yarns and also made it possible to ensure high roundness in the yarns (reducing the flattening ratio). The present invention has the above-mentioned effects on all thread products, such as fishing line, tennis string, embroidery thread, sewing thread, rope, and cores for curled cord-shaped cell phone straps (fishing nets, safety nets). In particular, the invention provides fishing line that has excellent knot strength and is less prone to line trouble such as tangling in fishing rod guides, as described above. In other words, the present invention improves the knot strength of various types of line, including fishing line, and also makes it possible to ensure practical roundness of the line. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is an explanatory diagram showing a method for measuring the lubricity (speed) in Table 4. DETAILED DESCRIPTION OF THE INVENTION

[0013] A preferred embodiment of the present invention will now be described. The present invention can be applied to all types of thread products, such as fishing line, tennis strings, embroidery thread, sewing thread, rope, and cores for curled cord-like mobile phone straps (fishing nets, safety nets). The thread according to the present invention is particularly suitable for fishing line. A well-known spinning technique is ply twisting (double twist), in which one or more threads are pulled together and twisted (first twist), and then two or more of these are pulled together and twisted again (top twist) (ply twist yarn is a yarn made by pulling two or more threads together and twisting them in the opposite direction to the first twist. / JIS terminology).

[0014] As mentioned above, the present invention is a major departure from conventional thinking, and unlike the above-mentioned ply twisting, it does not use two or more threads to perform twists in different directions, namely, a first twist (hereinafter referred to as a primary twist) and a second twist (hereinafter referred to as a final twist), but rather, as mentioned above, uses a resin to perform twists on a single multifilament (hereinafter simply referred to as a filament as necessary) (in the explanation of the present invention, a primary twist refers to a twist performed on a filament first, and a final twist refers to a twist performed on a filament after the primary twist in the opposite direction to the primary twist). The filaments are coated with a thermoplastic resin at least before the final twisting. This is because, during the manufacturing process, the uncured resin acts to provide the effects of both the first twisting and the final twisting. In addition, this also provides the effect of further delaying the untwisting. The above-mentioned ratio of the number of twists in the final twist to the first twist being 1.05 or more and 2.5 or less, and the number of twists in the final twist being 180 to 1000 T / M, means that the first twist and final twist are applied within these ranges at the time of twisting during production (this does not refer to the number of twists and twist ratio after completion). Because the filament is coated with resin, it is difficult to check the state of the finished filament, but the application of the first twist followed by the second twist causes untwisting, and the number of twists and twist ratio of the finished product often differ from those described above. However, even if untwisting occurs, the knot strength can be significantly improved by applying each twist within the above range. Furthermore, if untwisting occurs, it is possible to use a single twist from the beginning, but if a single twist is used, the yarn will become flat, and even if the same knot strength can be ensured, it will not be possible to obtain a yarn with a roundness (flattening) within the above range. Therefore, even if untwisting occurs and the amount of twist applied to the first twist is unwound (even if 100% of the twist applied to the first twist is unwound), a higher roundness (lower flattening) can be ensured compared to when no second twist is applied at all, i.e., when a single twist is used from the beginning. The material for forming the single filament is not particularly limited, and well-known synthetic resins such as polyarylate, polyethylene, polyaramid, aramid, polyester (PET / polyethylene terephthalate), and ultra-high molecular weight polyethylene can be used. Because the single filament is the main component of the line, its weight is closely related to the weight of the line. For example, when the line of the present invention is used for fishing, the material for forming the single filament can be selected depending on the depth of the target fish (the fish being targeted by fishing). When the target fish are near the surface, the fishing line itself should be lighter than seawater (specific gravity 1.023). For example, ultra-high molecular weight polyethylene (ULHMWPE) (specific gravity approximately 0.97) can be used as the material for forming such a single filament. Furthermore, when the target fish are deep in the sea, the fishing line itself should be heavier than seawater so that it does not float to the surface. For example, polyarylate or aramid (both specific gravities approximately 1.41) can be used as the material for forming such a single filament. The thickness (fineness) of the single yarn is 0.8 dtex or more, preferably 1.1 dtex or more. If a single yarn having a thickness less than the lower limit is used, the gaps between adjacent single yarns in the multifilament will be relatively small, making it difficult for the resin to penetrate into the gaps, and there is a risk of reduced adhesion between the single yarns due to water penetration, etc. Furthermore, the thickness (fineness) of the single yarn is 2.5 dtex or less, preferably 2.0 dtex or less. If a single yarn having a thickness exceeding the upper limit is used, the surface area of ​​the single yarn will be small, which may reduce its adhesiveness to the resin. Furthermore, single yarns having a relatively large thickness make it difficult for the cross-sectional outer shape of the multifilament to become approximately circular due to the unevenness that appears on the surface (the unevenness is due to the outer shape of the single yarn). By making the cross-sectional outer shape of the multifilament approximately circular, the cross-sectional outer shape of the yarn will also become closer to a perfect circle. If a single yarn having a thickness equal to or less than the upper limit is used, a yarn having a cross-sectional outer shape close to a perfect circle can be constructed. When such a line is used as a fishing line, the contact resistance with the guide of the fishing rod is low, and a fishing line with excellent abrasion resistance and ease of handling can be provided. In this specification, the thickness of a single yarn can be determined by dividing the thickness of a multifilament by the number of filaments. Furthermore, the unit of thickness (fineness) "tex" is the weight (in grams) per 1,000 m, and "dtex" is the weight (in grams) per 10,000 m. In this specification, thickness (fineness) can also be measured, for example, in accordance with JIS L 1013 (2010)-8.3.1-b)B method.

[0015] Thermoplastic resins can be used as the coating resin. Examples of such thermoplastic resins include polyethylene (PE), polypropylene (PP), polystyrene (PS), acrylonitrile / styrene resin (AS), acrylonitrile / butadiene / styrene resin (ABS), methacrylic resin (PMMA), polyvinyl chloride (PVC), polyamide (PA), polyacetal (POM), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polymethylpentene (TPX), polycarbonate (PC), and polytetrafluoroethylene (PTFE). Synthetic resin adhesives can also be used as the coating resin. In particular, it is preferable to use, as the above-mentioned coating resin, one whose main component is any of urethane resin (particularly polyurethane resin), polyester resin, acrylic resin, chlorinated polypropylene resin, styrene resin, fluorine-based resin, and soft PVC (polyvinyl chloride).

[0016] The first to fourth preferred methods for producing the yarn will be explained below in order. First, the first manufacturing method will be described. In this method, a covering step, a first twisting step, a final twisting step, and a drying step are carried out in this order. In the coating process, a resin is first applied to a known multifilament made of ultra-high molecular weight polyethylene or polyarylate. Specifically, the surface of the multifilament and the spaces between the individual yarns constituting the multifilament are impregnated with the resin, and these areas are coated with the resin. Then, in the first twisting process, the resin-coated multifilament is twisted (first twisted) before the resin is completely cured. Specifically, the coated filament is twisted in one direction by a known method. After the twisting in one direction, the final twisting process immediately (before the coating resin is completely cured) involves twisting in the opposite direction (final twisted). After this reverse twisting, the filament is baked in a drying process to dry the resin. A surface treatment process is performed between the final twisting process and the drying process. The surface treatment is preferably performed after the twisting in the opposite direction and before the baking. This surface treatment smoothes the surface of the filament.

[0017] This first manufacturing method will now be described in more detail. As described above, the raw yarn is a multifilament made of ultra-high molecular weight polyethylene or polyarylate. In the coating step, the multifilament yarn is coated with a polyester resin by dip coating (coating the yarn by immersing it in a resin). Commercially available polyester resins can be used. For example, a polyester resin with a composition of 60 to 55 parts by weight of polyester and 40 to 45 parts by weight of styrene (total: 100 parts by weight) can be used. A resin liquid containing 70 parts by weight of the polyester resin and 30 parts by weight of a solvent (total: 100 parts by weight) can be used as the coating resin. The solvent can contain toluene, isopropyl alcohol, and ethyl acetate. It is particularly preferable to use a coating resin liquid containing 100 parts by weight of this resin liquid (polyester resin + solvent) and 3 parts by weight of glycerin (total: 103 parts by weight), and dip-coating the multifilament yarn with this coating resin liquid.

[0018] In the above dip coating, a roller is placed on the liquid surface of a resin tank containing a coating resin, and the roller submerges the yarn (filament) in the resin. The coating resin is applied to the filament in the coating process so that the amount of resin applied is 15 to 50 parts by weight per 100 parts by weight of the filament after the drying process described below to remove any solvent or water. If the amount of resin applied after the completed thread (after the drying process) is less than 15 parts by weight, adhesion is poor and the single filaments tend to break apart. This is particularly problematic when used as fishing line. Conversely, if the amount of resin applied after the completed thread (after the drying process) is greater than 50 parts by weight, it becomes less economical (higher costs) and the filament material's properties, such as flexibility and abrasion resistance, cannot be fully realized. In particular, with regard to the amount of resin applied after the drying process, it is preferable that the weight of the coating resin liquid be 20 to 40% of the weight of the multifilament before coating (the weight of the thread after coating and drying will be 100 to 200% of the weight of the thread before coating).

[0019] Then, in the above-mentioned first twisting step, the resin-coated filaments are first twisted using a conventionally known device (twisting machine) before the coating resin hardens. In this first twisting step, the filaments are twisted to a twist number of 180 to 1000 T / M. If the twist number is greater than 1000 T / M, the elasticity decreases significantly, which becomes a problem. Specifically, problems occur with yarn breakage during twisting processing, and problems with reduced physical properties occur after processing. Furthermore, if the twist number is less than 180 T / M, the filaments are in a parallel state, which causes problems such as single yarn loosening. Thus, if the first twist number is 180 T / M or more, the problem of single yarn loosening will practically disappear, but to more reliably eliminate the problem of single yarn loosening, it is preferable to set the twist number for the first twist to 450 T / M or more. After the first twist, but before the upper resin hardens, the multifilament is twisted in the opposite direction to that of the first twist in the above-mentioned final twisting process. For example, if an S twist is applied in the first twisting process, a Z twist is applied in the final twisting process. Conversely, if a Z twist is applied in the first twisting process, an S twist is applied in the final twisting process.

[0020] Specifically, in the final twisting step, a twist is applied in the opposite direction to the primary twist at a twist rate of 150 T / M or more. The final twist is applied so that the ratio of the primary twist to the final twist (the number of primary twists per final twist) is 1.05 to 2.5. If this twist rate ratio is less than 1.05, or conversely, if this twist rate ratio is greater than 2.5, the knot strength improves. However, in both cases, if both ends of 1 meter of the filament are grasped, the center is draped downward, and the grasped ends are brought close together, the thread will rotate more than once (an angle of 360 degrees or more). If such a filament is used as a fishing line, for example, it is prone to line trouble, such as tangling in the fishing rod guides, making it unsuitable for practical use. As mentioned above, the number of twists in the first twist and the second twist and the twist ratio of the two are those at the time of production, and do not mean that the final product will be in these ranges (the same applies to the second to fourth production methods described below). By applying both the first twist and the second twist, a filament having an aspect ratio of 1 to 1.25 can be obtained.

[0021] In the surface treatment process, a finishing agent is applied to the filament surface to smooth the surface. This finishing agent is preferably a solution of oil and an equal amount (by weight) of solvent. The application of the finishing agent in this surface treatment process is also preferably by dip coating. Furthermore, if the amount of resin adhered is large, the amount of resin can be adjusted by removing unnecessary resin with a solvent before applying the finishing agent in this surface treatment step. The baking carried out in the drying step involves baking the resin with dry heat at 80° C. to 330° C. In particular, when the above-mentioned resin and finishing agent are used, baking is preferably carried out with dry heat at 270° C. Also, instead of such a dry heat treatment (treatment by baking the coating resin), drying treatment using, for example, hot air can also be carried out. As described above, after the drying step, the solvent (liquid component) is completely removed by the baking in the drying step, and only the solid component (polyester) remains attached to the filaments. The yarn that has been completed after the above steps is passed through a well-known take-up machine and then wound on a winding machine. In the above, all steps except the drying step are carried out at room temperature. Furthermore, although polyester resin is used as the coating resin in the above example, polyurethane resin and acrylic resin can also be used.

[0022] Next, a second manufacturing method will be described, which involves a covering step, a first twisting step, a resin adding step, a final twisting step, and a drying step, in this order. As in the above, first, in the covering step, a known multifilament (raw yarn) made of ultra-high molecular weight polyethylene or polyarylate is coated with resin. In the first twisting step, the resin-coated multifilament is twisted in one direction (first twist) before the resin completely hardens. Here, unlike the first method, after the first twisting, a resin is further applied to the filament surface to coat it before the final twisting is performed in the resin application step. Then, in the final twisting step, the filament is twisted in the opposite direction to the first twisting step (final twist). Then, in the drying step, baking is performed to dry the resin. In this method, it is preferable to perform a surface treatment step and a secondary drying step after the drying step. The surface treatment step is the same as the surface treatment step in the first manufacturing method. Furthermore, in the secondary drying step, the surface-treated filament is baked to dry the resin.

[0023] The second manufacturing method will now be described in more detail. The raw yarn is a multifilament made of ultra-high molecular weight polyethylene or polyarylate, the same as in the first manufacturing method. In the coating process, a known multifilament (raw yarn) made of ultra-high molecular weight polyethylene or polyarylate is coated with a urethane resin by dip coating, as in the first manufacturing method. A commercially available polyurethane resin can be used as the urethane resin. For example, a commercially available polyurethane resin with a composition of 70 to 45 parts by weight of polyurethane and 30 to 55 parts by weight of solvent (total 100 parts by weight) can be used. The resin liquid used for the coating described above is 100 parts by weight of the polyurethane resin and 10 parts by weight of the solvent (total 110 parts by weight).

[0024] Regarding the amount of resin applied, the above-mentioned resin liquid is applied to the twisted filament in the coating process so that the coating resin (solid content) is 10 to 20% by weight per 100 parts by weight of the filament after the drying process (or the secondary drying process if a secondary drying process is performed) and the solvent components have been removed.

[0025] In the first twisting step, the resin-coated multifilament is twisted (first twisted) before the resin applied in the coating step completely hardens. That is, the coated filament is twisted in one direction by a known means. In the first twisting step of this second manufacturing method, the first twisting is performed under the same conditions as in the first manufacturing method. That is, the number of twists in the first twisting is set to 180 to 1000 T / M. The filaments after this first twisting process are further coated with resin in the resin application process. In this resin application process, a modified polypropylene (hereinafter referred to as HV), such as a commercially available PP primer, can be used as the coating resin. For example, such an HV resin can be one having a composition of 30 parts by weight of chlorinated polypropylene and 70 parts by weight of toluene (total 100 parts by weight). In this resin application step, the resin liquid used for coating can be 50 parts by weight of the HV and 50 parts by weight of the solvent (total 100 parts by weight). The filaments are further dip-coated with such a resin liquid, as described above. Regarding the amount of resin applied in the resin application step, the resin liquid is applied so that 10 to 20 parts by weight of resin (solid content) covers the filaments after the subsequent drying step (if a secondary drying step is performed), i.e., after the solvent component has been removed, per 100 parts by weight of the raw yarn (filament before the coating step). Therefore, after the subsequent drying process or secondary drying process, the filament will have 20 to 40 weight parts of resin attached to it per 100 weight parts of raw yarn due to the resin coating in the coating process and the resin coating in the resin addition process (resulting in a total of 120 to 140 weight parts of the finished filament).

[0026] The filaments further coated in this resin adding step are then twisted in the second twisting step in the opposite direction to the first twisting. The final twist in this second manufacturing method is also performed under the same conditions as in the first manufacturing method, i.e., the ratio of the number of twists in the first twist to the number of twists in the final twist is set to 1.05 or more and 2.5 or less, and the number of twists in the final twist is set to 150 T / M or more. Then, in the drying step, the resin coating the filaments is baked by dry heat treatment, as in the first manufacturing method. This treatment is preferably carried out at a dry heat of 110°C to 220°C, more preferably at a dry heat of 120°C to 200°C. Baking at a dry heat of 180°C is particularly preferred.

[0027] The surface treatment step is the same as that in the first manufacturing method, that is, the finishing agent is applied to the filament surface by dip coating. After the surface treatment step, the surface-treated filaments are preferably further baked in the secondary drying step to complete the yarn. In this secondary drying step, rather than dry heat treatment, baking is preferably performed with dry heat at 110°C to 220°C, and baking with dry heat at 120°C to 200°C is more preferred. Baking with dry heat at 150°C is particularly preferred. The resin solvent is removed by the drying step and the sub-drying step, and as described above, the filaments are covered with 20 to 40% by weight of the resin solid content of the raw yarn.

[0028] Next, a third manufacturing method will be described, which involves carrying out a covering step, a first twisting step, a resin application step, a final twisting step, a secondary resin application step, and a drying step in this order. The steps from the covering step to the final twisting step in this method are the same as those in the second manufacturing method. The secondary resin application step is a step of applying additional resin to the filaments after the final twisting step. The drying step performed after this secondary resin application step is a step of baking the resin by dry heat treatment, as in the first and second manufacturing methods.

[0029] This third manufacturing method will now be described in more detail. The raw yarn is a multifilament made of ultra-high molecular weight polyethylene or polyarylate, the same as in the first manufacturing method. In the coating process of the third manufacturing method, the multifilament (raw yarn) is coated with HV resin. For coating, a resin solution containing 90 parts by weight of this HV resin and 10 parts by weight of polyester resin is used, and dip coating is performed using a coating resin solution containing 50 parts by weight of the resin solution (HV + polyester resin) and 50 parts by weight of solvent (total 100 parts by weight). The resin coating in this coating step is carried out so that the amount of resin (solid content) deposited after the drying step is 10 to 20 parts by weight per 100 parts by weight of the filament (raw yarn).

[0030] After the covering step, the first twisting step is carried out. The number of first twists in this third manufacturing method is the same as that in the first manufacturing method. After this first twisting step, the first twisted filaments are further coated with resin in a resin application step. In the resin application step in this third manufacturing method, dip coating is performed with a coating resin liquid having the same components and blending ratios as in the coating step of this third manufacturing method. The amount of coating is also the same. The resin coating in this resin adding step is also carried out so that the amount of resin attached after the drying step is 10 to 20 parts by weight per 100 parts by weight of the filament (raw yarn).

[0031] After the resin application step, the final twisting step is carried out. The number of twists in the final twisting step and the ratio of the number of twists in the first twisting step to the number of twists in the final twisting step are the same as those in the first manufacturing method. After the final twisting step, the secondary resin application step is carried out. In this resin application step, commercially available HV resins can be used. For example, the HV resins can be applied to the filaments by dip coating. In this secondary resin application step, the HV resins can be used without adjusting their components. In this secondary resin application step, the amount of coating resin applied is also set to 10 to 20 parts by weight per 100 parts by weight of the raw yarn after the subsequent drying step. However, in the third production method, it is preferable that the total weight ratio of the resin applied to the filament in the coating step, resin application step, and the secondary resin application step after the drying step does not exceed the range of 20 to 40 parts by weight of resin (solid content) per 100 parts by weight of the raw yarn. As mentioned above, if the amount of resin applied is too high, it is not economical and the filament material properties such as flexibility and abrasion resistance cannot be exhibited, while if it is too low, adhesion is poor and the single yarns will break apart. After this secondary resin application step, the drying step is carried out. This drying step involves baking the resin coating the filament with dry heat. This treatment is preferably carried out at a dry heat of 110°C to 220°C, more preferably at a dry heat of 120°C to 200°C. Baking at a dry heat of 150°C is particularly preferred.

[0032] Next, a fourth manufacturing method will be described, which involves carrying out a first twisting step, a covering step, a final twisting step, a resin application step, and a drying step in this order. In the above-mentioned first twisting step, before resin coating, a multifilament raw yarn made of ultra-high molecular weight polyethylene or polyarylate is first twisted in one direction (first twist). Then, after the first twisting, in the coating step, the surface of the multifilament is coated with resin. After resin coating, in the final twisting step, the filaments twisted in the first twisting step are twisted in the opposite direction to the twist in the first twisting step. Then, in the resin application step, the filaments are further coated with resin. After the drying step, it is preferable to carry out a surface treatment step and a secondary drying step. This surface treatment step is the same as the surface treatment step in the first and second manufacturing methods, and the secondary drying step is the same as the drying step in this fourth manufacturing method.

[0033] This fourth manufacturing method will now be described in more detail. The raw yarn is a multifilament made of ultra-high molecular weight polyethylene or polyarylate, the same as in the first manufacturing method. In the first twisting step, the yarn is twisted with the same number of twists as in the first twisting step in the first manufacturing method using a conventionally known device. Then, in the covering step, the twisted filaments are covered with a urethane resin. A commercially available polyurethane resin can be used as the urethane resin. The resin liquid used for the coating described above is composed of 50 parts by weight of the polyurethane resin and 50 parts by weight of the ester (total 100 parts by weight), and the filaments that have been subjected to the first twist are dip-coated with the coating resin liquid, which is 100 parts by weight of the resin liquid (polyurethane resin + ester) and 10 parts by weight of glycerin (total 110 parts by weight). The amount of resin applied is such that after the drying step (or the secondary drying step, if any) there will be 10 to 20 parts by weight of resin (solid content) per 100 parts by weight of the raw yarn. Then, in the final twisting step, the final twist is applied in the opposite direction to the first twist. The number of twists in this final twist and the ratio of the number of twists in the first twist to the number of twists in the final twist are the same as those in the first method described above.

[0034] After the final twisting step, the filaments are further coated with resin in a resin application step. A resin liquid with a composition of 30 parts by weight of urethane resin and 70 parts by weight of acrylic resin (total 100 parts by weight) is used as this resin, and is applied to the filaments by dip coating. Commercially available polyurethane resins can be used as the urethane resin. Examples of such resins include those with a composition of 70 to 45 parts by weight of urethane resin and 30 to 55 parts by weight of solvent (total 100 parts by weight). Commercially available acrylic resins can also be used. Examples of such resins include those with a composition of 60 to 40 parts by weight of acrylic resin and 40 to 60 parts by weight of solvent (total 100 parts by weight). The amount of the above resin (urethane resin + acrylic resin) adhered is set to an amount that results in 10 to 20 parts by weight of resin (solid content) per 100 parts by weight of raw yarn after the drying process (or the secondary drying process if performed). Therefore, after the solvent is removed in the subsequent drying process, the total amount of resin attached in the above coating process and the resin attached in the resin addition process will be 20 to 40 parts by weight per 100 parts by weight of the raw yarn (the total weight of the filament after resin attachment will be 120 to 140 parts by weight).

[0035] After the resin application step, in the drying step, the resin applied to the filament is baked with dry heat at 110° C. to 220° C. In particular, it is more preferable to perform the baking with dry heat at 120° C. to 220° C., and most preferably to perform the baking with dry heat at 180° C. After this drying step, the above-mentioned surface treatment step is carried out, which is the same surface treatment step as in the first and second manufacturing methods. After the surface treatment step, a secondary drying step is performed to further carry out dry heat treatment. In this secondary drying step, baking is also carried out at a dry heat of 100°C to 220°C. In particular, baking is more preferably carried out at a dry heat of 120°C to 220°C, and most preferably at a dry heat of 150°C.

[0036] The yarn of the present invention can be manufactured by the above manufacturing methods 1 to 4. In particular, by employing the above manufacturing methods 1 to 4, it is possible to provide yarn with a first twist number of 500 to 1000 times per meter, a tensile strength of 27 g / d or more, a tensile elongation of 7% or less, a knot strength of 11 g / d or more, a knot elongation of 2.7% or less, and an aspect ratio of 1 to 1.17. In the above-mentioned first to fourth manufacturing methods, the solid content of the resin coating the filament after the drying process (or secondary drying process) needs to be within the above-mentioned range of adhesion amount, and the blending ratio of the resin and solvent when adhering to the filament shown in the first to fourth manufacturing methods can be changed to other ratios.

[0037] In the first to fourth manufacturing methods, as described above, it is preferable to use a coating resin whose main component is any of urethane resin (particularly polyurethane resin), polyester resin, acrylic resin, chlorinated polypropylene resin, styrene resin, fluorine-based resin, and soft PVC (polyvinyl chloride).

[0038] The urethane resin includes a polyurethane resin emulsion. The styrene resin includes a styrene / acrylic emulsion. Such a styrene / acrylic emulsion may have a resin solid content of 45% by weight (total 100% by weight). Furthermore, commercially available oils such as silicon resin, other silicone oils, liquid paraffin, other mineral oils, and vegetable oils can be used as finishing agents.

[0039] In the above, in the first manufacturing method, polyester resin is used as the coating resin, but in the first manufacturing method, the above-mentioned polyurethane resin, acrylic resin, chlorinated polypropylene resin, the above-mentioned styrene resin, fluorine-based resin or soft PVC (polyvinyl chloride) can be used instead of polyester resin.

[0040] In the second manufacturing method described above, a urethane resin is used in the coating step and a chlorinated polypropylene resin (HV) is used in the resin adhesion step, but in the second manufacturing method, the above-mentioned polyester resin, acrylic resin, styrene resin, fluorine-based resin, or soft PVC (polyvinyl chloride) can be used instead of such a urethane resin or chlorinated polypropylene resin. Furthermore, even when a urethane resin is used, for example, a polyurethane resin emulsion can be used, and such a polyurethane resin emulsion can have a solid content of, for example, 39% by weight (total 100% by weight).

[0041] In the third manufacturing method, a material containing chlorinated polypropylene resin (HV) as the main component (HV + polyester) is used in the coating process, and chlorinated polypropylene resin (HV) is further used in the resin adding process and the secondary resin adding process. However, in this third manufacturing method, the above-mentioned urethane resin, polyester resin, acrylic resin, styrene resin, fluorine-based resin, or soft PVC (polyvinyl chloride) can also be used in place of these resins. In addition, in the fourth manufacturing method described above, a urethane resin is used in the coating step, and a urethane resin and an acrylic resin are used in the resin adding step, but these resins can be replaced with the above-mentioned polyester resin, chlorinated polypropylene resin, styrene resin, fluorine-based resin, or soft PVC (polyvinyl chloride).

[0042] In each of the above manufacturing methods, for example, Dyneema SK60 (Dyneema / registered trademark) can be used as the ultra-high molecular weight polyethylene multifilament, and for example, Vectran HT220 40 (Vectran / registered trademark) can be used as the polyarylate multifilament. In each of the above-mentioned manufacturing methods, examples of the coating resin used in the coating step include the following. Specifically, FH-123 (product name: Solar Co., Ltd.) can be used as the polyester resin, and Nalcoat JW PE301 (product name: Naruse Chemical) can be used as the polyethylene resin. Hydran AP-60 (Hydran / registered trademark), Hydran HW-140 (Hydran / registered trademark), Hi-Resin PU-9500 (product name: Takamatsu Oil & Fat), Neo Sticker 700 (Neo Sticker / registered trademark), Permarin UA-310 (Permarin / registered trademark), Nipporan 5210 (Nipporan / registered trademark), and Polyurex Sanding Sealer X-222E (product name: Washin Chemical Industry Co., Ltd.) can be used as the polyurethane resin. PP Coat HV (product name: Kubo Taka Paint Co., Ltd.) can be used as the modified polypropylene resin (chlorinated polypropylene resin). Poly Auto Clear (product name: Kubo Taka Paint Co., Ltd.) can be used as the acrylic urethane resin. Furthermore, as the acrylic resin, a water-soluble gloss varnish (product name: Washin Paint Co., Ltd.) can be used. As a solvent for the polyurethane resin, and as a solvent for the polyester resin, DyReducer PA No. 20 (DyReducer / registered trademark) can be used. In addition, for example, the resin liquid of the HV resin in the resin addition step can be one containing the above-mentioned PP coated HV and its solvent, the above-mentioned Die Reducer PA No. 20. The above-mentioned PP coated HV can be used as the HV resin in the secondary resin addition step. Silicone resin (a silicone-based surface treatment agent) is preferably used as the finishing agent. When using a solvent for this finishing agent, xylene can be used. Other oils that can be used as the finishing agent include silicone oil, liquid paraffin, silicone rubber, mineral oil, and vegetable oil. The above-mentioned Die Reducer PA No. 20 can also be used to remove unnecessary resin before applying the finishing agent. Other solvents that can be used include toluene, isopropyl alcohol, and ethyl acetate. Furthermore, Permarin UA-310 (product name / Sanyo Chemical Industries, Ltd.) can be used as the polyurethane resin emulsion. As the styrene / acrylic emulsion in the above styrene resin, Movinyl 975N (trade name / Nichigo Movinyl Co., Ltd.) can be used. As the polyethylene resin emulsion, Nalcoat JW PE301 (trade name: Naruse Chemical) can be used. Furthermore, as the hot-melt polyamide emulsion (polyamide copolymer), Grirltex 1500A (trade name: EMS) can be used. Furthermore, as the soft PVC, ethylene acrylic acid copolymer sodium salt (ethylene acrylic acid copolymer neutralized salt) can be used, for example, Zaixen-N (registered trademark: Sumitomo Seika Chemicals Co., Ltd.). As described above, for example, in the drying step of the first manufacturing method, the resin is baked with dry heat at 80°C to 330°C, and in the drying step of the second manufacturing method, it is appropriate to bake with dry heat at 110°C to 220°C, more preferably at 120°C to 200°C. More specifically, when the above-mentioned Dyneema SK60 is used as the ultra-high molecular weight polyethylene multifilament, since its melting point is 120°C to 130°C, it is preferable to bake with dry heat at 90°C to 150°C in the drying step of each of the above manufacturing methods. When Vectran HT220 40 is used as the polyarylate multifilament, since its melting point is 200°C or higher, it is preferable to bake with dry heat at 90°C to 330°C in the drying step of each manufacturing method. Furthermore, in the first manufacturing method, Nalcoat JW PE301 was used as the polyethylene resin emulsion. When an emulsion-type polyethylene resin, including Nalcoat JW PE301, is used, a calcination step is preferably carried out after the first twisting step and before the final twisting step in order to strengthen adhesive strength. This calcination step is a step in which the coating resin is baked at a dry heat of 65°C to 95°C onto the filaments that have been subjected to the first twisting after the resin has been applied. In this calcination step, the resin is preferably baked at a dry heat of 70°C to 90°C, and more preferably at a dry heat of 80°C. On the other hand, when a polyethylene resin that is not an emulsion type is used, the calcination step is not carried out. [Example]

[0043] Examples and comparative examples of the present invention will be described below. All of these lines are fishing lines.

[0044] [Table 1]

[0045] Table 1 shows the data for 19 yarns, yarns 1 to 19. In the tests shown in Table 1, the methods for measuring tensile strength, tensile elongation, knot strength and knot elongation are based on JIS L 1013-1981. Specifically, for tensile strength, tensile elongation, and tensile strength, a Shimadzu Autograph S-500D, a type of Instron-type testing machine, was used to apply a load at a certain tensile strength to each filament and measure the stress until it broke.The load at break was taken as the tensile strength (kg), the elongation at that time as the tensile elongation (%), and the value obtained by dividing the load at break by the cross-sectional area of ​​the yarn (d: denier) was taken as the tensile strength (g / d). For knot strength, knot elongation, and knot strength, each fishing line was knotted tightly with a knot knot, and then a load was applied to each sample at a constant pulling speed using a Shimadzu Autograph S-500D in the same manner as above. The load at break was taken as the knot strength (kg), the elongation as the knot elongation (%), and the load at break divided by the cross-sectional area of ​​the line as the knot strength (g / d). The rotations shown in Table 1 indicate whether or not a rotation of more than one rotation, i.e., 360 degrees or more, occurs when both ends of a 1m length of thread are grasped, the center of the thread is hung downward, and the grasped ends are brought close to each other. In other words, rotations of more than one rotation are marked with an X, and rotations of less than one rotation are marked with an O. In addition to checking for the presence or absence of such rotation, the flatness was measured using a thickness gauge to ensure that it was in the range of 1 to 1.25, and furthermore, it was visually confirmed that there was no loosening of the single yarns or no yarn breakage. If all of these conditions were met, the yarn was marked with a circle in the judgment column, and if not, it was marked with an X.

[0046] These yarns 1 to 11 are made by processing ultra-high molecular weight polyethylene as a raw yarn. Also, yarns 12 to 19 are made by processing polyarylate as a raw yarn. The aforementioned Dyneema was used as the ultra-high molecular weight polyethylene multifilament. The aforementioned Vectran was used as the polyarylate multifilament. Yarns 1, 2, 7, and 12, as well as yarns 8 to 11 and yarns 13 to 16, were made of 400 denier raw yarn, yarn 3 was made of 300 denier raw yarn, yarn 4 was made of 250 denier raw yarn, yarn 5 was made of 200 denier raw yarn, yarn 6 was made of 150 denier raw yarn, and yarns 17 to 19 were made of 250 denier raw yarn.

[0047] Yarns 1 to 16 were produced by the third manufacturing method. In the coating process, a resin solution containing 90 parts by weight of PP Coat HV (HV) and 10 parts by weight of FH-123 (polyester resin) (total: 100 parts by weight) was used. Dip coating was performed using a coating resin solution containing 50 parts by weight of the resin solution (HV + polyester resin) and 50 parts by weight of Die Reducer PA No. 20 (solvent) (total: 100 parts by weight). The resin addition process also involved dip coating using the same coating resin solution as in the coating process. Furthermore, in the secondary resin addition process, dip coating was performed using only PP Coat HV (HV). In the drying process, the resin-coated filaments were baked at 150°C with dry heat. The total amount of resin coating the baked filaments was 40 parts by weight per 100 parts by weight of the uncoated filaments (raw yarn).

[0048] Moreover, the yarns 17 to 19 were produced by the first production method. Specifically, in the coating process, the yarn 17 was produced by dip-coating the filaments with a resin liquid containing 70 parts by weight of FH-123 (polyester resin) and 30 parts by weight of Die Reducer PA No. 20 (solvent) (total: 100 parts by weight), and the filaments were dip-coated with the coating resin liquid containing 100 parts by weight of this resin liquid (polyester resin + solvent) and 3 parts by weight of glycerin (total: 103 parts by weight). In addition, the yarn 18 is obtained by dip-coating the filaments with Permarin UA-310 (polyurethane resin emulsion) as the coating resin liquid in the coating process without any adjustment. Furthermore, in the coating process, the filaments of the yarn 19 are dip-coated with Movinyl 975N (styrene / acrylic emulsion) as a coating resin liquid without any adjustment. For each of the yarns 17 to 19, a finishing agent was used in the surface treatment process, which was a 1:1 (weight ratio) mixture of commercially available silicone resin (oil) and xylene (a solvent for the oil). Furthermore, for each of yarns 17 to 19, in the drying process, the resin-coated filaments were baked with dry heat at 270° C. The total amount of resin coating the baked filaments was 30 parts by weight per 100 parts by weight of the filaments (raw yarns) before coating.

[0049] Each yarn in Table 1 will be explained below. First, we will explain yarns 1 to 11, which use ultra-high molecular weight polyethylene as the raw yarn. Dyneema SK40 was used as the multifilament for this ultra-high molecular weight polyethylene.

[0050] Yarn 1 had a first twist of 855 turns per meter and a final twist of 726 turns per meter. The ratio of the first twist to the final twist was 1.18. The results were a tensile strength of 11.83 kg, a tensile strength of 29.58 g / d (grams per denier, the same applies below), a tensile elongation of 6.14%, a knot strength of 5.75 kg, a knot strength of 14.38 g / d, a knot elongation of 2.60%, and a circularity (flattening, the same applies below) of 1.15. Yarn 2 had a first twist of 726 turns per minute and a final twist of 619 turns per minute. The ratio of the first twist to the final twist was 1.17. The results were a tensile strength of 12.09 kg, a tensile strength of 30.23 g / d, a tensile elongation of 5.21%, a knot strength of 5.63 kg, a knot strength of 14.08 g / d, a knot elongation of 2.47%, and a circularity of 1.08.

[0051] Yarn 3 had a first twist of 855 turns per minute and a final twist of 726 turns per minute. The ratio of the first twist to the final twist was 1.18. The results were a tensile strength of 8.68 kg, a tensile strength of 28.77 g / d, a tensile elongation of 5.18%, a knot strength of 4.06 kg, a knot strength of 13.53 g / d, a knot elongation of 2.35%, and a circularity of 1.11. Yarn 4 had a first twist of 855 turns per minute and a final twist of 726 turns per minute. The ratio of the first twist to the final twist was 1.18. The results were tensile strength of 7.09 kg, tensile strength of 28.35 g / d, tensile elongation of 5.27%, knot strength of 2.97 kg, knot strength of 11.88 g / d, knot elongation of 2.47%, and circularity of 1.09.

[0052] Yarn 5 had a first twist of 855 turns per minute and a final twist of 726 turns per minute. The ratio of the first twist to the final twist was 1.18. The resulting tensile strength was 6.12 kg, tensile strength was 30.60 g / d, tensile elongation was 5.05%, knot strength was 2.91 kg, knot strength was 14.54 g / d, knot elongation was 2.26%, and circularity was 1.12. Yarn 6 had a first twist of 855 turns per minute and a final twist of 726 turns per minute. The ratio of the first twist to the final twist was 1.18. The results were a tensile strength of 4.65 kg, a tensile strength of 31.00 g / d, a tensile elongation of 5.05%, a knot strength of 2.50 kg, a knot strength of 16.65 g / d, a knot elongation of 2.35%, and a circularity of 1.10. Yarn 7 had a first twist of 938 turns per minute and a final twist of 790 turns per minute. The ratio of the first twist to the final twist was 1.19. The results were a tensile strength of 10.21 kg, a tensile strength of 25.53 g / d, a tensile elongation of 4.97%, a knot strength of 4.56 kg, a knot strength of 11.40 g / d, a knot elongation of 1.79%, and a circularity of 1.09.

[0053] Yarn 8 had a first twist of 176 turns per minute and a final twist of 148 turns per minute. The ratio of the first twist to the final twist was 1.19. The results were a tensile strength of 11.52 kg, a tensile strength of 28.80 g / d, a tensile elongation of 5.21%, a knot strength of 5.32 kg, a knot strength of 13.30 g / d, a knot elongation of 2.41%, and a circularity of 1.29. Yarn 9 had a first twist of 726 turns per minute and a final twist of 280 turns per minute. The ratio of the first twist to the final twist was 2.59. The results were a tensile strength of 11.43 kg, a tensile strength of 28.58 g / d, a tensile elongation of 4.76%, a knot strength of 5.58 kg, a knot strength of 13.95 g / d, a knot elongation of 1.81%, and a circularity of 1.20. Yarn 10 had a first twist of 726 turns per minute and a final twist of 715 turns per minute. The ratio of the first twist to the final twist was 1.02. The resulting values ​​were tensile strength of 11.02 kg, tensile strength of 27.55 g / d, tensile elongation of 4.89%, knot strength of 4.69 kg, knot strength of 11.73 g / d, knot elongation of 1.77%, and circularity of 1.24. Yarn 11 was first twisted at a twist rate of 1018 T / M, but yarn breakage occurred during final twisting.

[0054] Next, we will explain yarns 12 to 19, which use polyarylate as the raw yarn. Vectran HT220T 40 was used as the polyarylate multifilament. Yarn 12 had a first twist of 855 turns per meter and a final twist of 726 turns per meter. The ratio of the first twist to the final twist was 1.18. The resulting values ​​were tensile strength of 11.49 kg, tensile strength of 28.73 g / d, tensile elongation of 4.06%, knot strength of 4.88 kg, knot strength of 12.20 g / d, knot elongation of 1.73%, and circularity of 1.13. Yarn 16 was first twisted at 1018 T / M, but yarn breakage occurred during final twisting. Yarn 17 had a first twist of 726 turns per meter and a final twist of 507 turns per meter. The ratio of the first twist to the final twist was 1.43. The resulting values ​​were tensile strength 6.95 kg, tensile strength 27.80 g / d, tensile elongation 3.57%, knot strength 3.43 kg, knot strength 13.72 g / d, knot elongation 1.92%, and circularity 1.06.

[0055] Yarn 18 had a first twist of 726 turns per meter and a final twist of 507 turns per meter. The ratio of the first twist to the final twist was 1.43. The resulting values ​​were tensile strength of 7.39 kg, tensile strength of 29.56 g / d, tensile elongation of 3.51%, knot strength of 3.87 kg, knot strength of 15.48 g / d, knot elongation of 2.01%, and circularity of 1.07. Yarn 19 had a first twist of 726 turns per meter and a final twist of 507 turns per meter. The ratio of the first twist to the final twist was 1.43. The resulting tensile strength was 7.24 kg, tensile strength 28.96 g / d, tensile elongation 3.48%, knot strength 3.90 kg, knot strength 15.60 g / d, knot elongation 1.98%, and circularity 1.06.

[0056] Yarn 13 had a first twist of 176 turns per meter and a final twist of 148 turns per meter. The ratio of the first twist to the final twist was 1.19. The resulting values ​​were tensile strength of 11.26 kg, tensile strength of 28.15 g / d, tensile elongation of 4.21%, knot strength of 4.74 kg, knot strength of 11.85 g / d, knot elongation of 1.75%, and circularity of 1.26. Yarn 14 had a first twist of 726 turns per minute and a final twist of 280 turns per minute. The ratio of the first twist to the final twist was 2.59. The resulting tensile strength was 11.03 kg, tensile strength was 27.58 g / d, tensile elongation was 4.12%, knot strength was 4.96 kg, knot strength was 12.40 g / d, knot elongation was 1.77%, and circularity was 1.21. Yarn 15 had a first twist of 726 turns per meter and a final twist of 715 turns per meter. The ratio of the first twist to the final twist was 1.02. The resulting tensile strength was 11.54 kg, tensile strength was 28.85 g / d, tensile elongation was 4.08%, knot strength was 3.90 kg, knot strength was 9.75 g / d, knot elongation was 1.91%, and circularity was 1.25.

[0057] [Table 2]

[0058] Yarns 20 to 25 shown in Table 2 are Examples 1 to 6 of Japanese Patent Application No. 2005-56927, and are comparative examples to the examples of the present invention. Specifically, they are two multifilament yarns made of the same material that are plied together, and they exhibited good results in terms of detwist. For yarns 20 to 25, 500 denier polyarylate (Vectran HT220T 40) was used for the plied yarns. The primary twist (direction) was S twist, and the final twist (direction) was Z twist. For lines 20-24, a PP (chlorinated polypropylene) primer was used as the coating resin, and the coating method was dip coating, with 25 parts by weight of resin coated for every 100 parts by weight of fishing line. The drying process was done by hot air drying at 120°C. For line 25, a water-based polyurethane resin (Hydran HW-333 / Hydran is a registered trademark) was used as the coating resin, with 12 parts by weight of resin coated for every 100 parts by weight of fishing line. The methods for measuring tensile strength, tensile elongation, knot strength and knot elongation are based on JIS L 1013-1981.

[0059] As shown in Table 2, yarn 20 has a knot strength of 7.8 g / d, yarn 21 has a knot strength of 7.5 g / d, yarn 22 has a knot strength of 7.8 g / d, yarn 23 has a knot strength of 7.7 g / d, yarn 24 has a knot strength of 7.6 g / d, and yarn 25 has a knot strength of 7.9 g / d. That is, yarns 20 to 25 all have knot strengths of the 7 g / d range. In contrast, the knot strengths of yarns 1 to 19, which are examples of the present invention and are shown in Table 1, are generally 10 g / d or greater. Regarding knot strength, yarns 1 to 19 (examples) show relatively good results, with knot strengths in the double digits (10 to 16 g / d) compared to yarns 20 to 25 (comparison examples) which have a single digit knot strength (7 to 8 g / d). This is also true for the other examples described below. These findings confirm the significant improvement in knot strength of the present invention.

[0060] Looking at the individual Examples, Yarns 1 to 7, 12, and 17 to 19 in particular all had circularity within the range of 1 to 1.25, rotation was good, and there was no single yarn loosening. In contrast, Yarn 8 shown in Table 1 had a ratio of top and bottom twists of 1.19, which was within the range of 1.05 to 2.5, but the twist number of the first twist was 176 T / M, which was lower than 180 M / T, single yarn loosening was observed, and the circularity was 1.29, which was higher than 1.25. Furthermore, yarn 9 had a twist ratio of 2.59, which was greater than 2.5, and more than one rotation occurred. Furthermore, yarn 10 had a twist ratio of 1.02, which is less than 1.05, and more than one turn occurred. The yarns 11 and 16 had a first twist of 1018 T / M, which was more than 1000 T / M, and during the first twisting, the yarn broke, making it impossible to carry out the subsequent steps. Furthermore, yarn 13 had a twist number of 176 T / M in the first twist, which was lower than 180 T / M, and the single yarn loosened, and the circularity was 1.26, which was higher than the above-mentioned 1.25. Furthermore, yarn 14 had a twist ratio of 2.59, which was greater than the 2.5 ratio mentioned above, and resulted in more than one full turn. Furthermore, yarn 15 had a twist ratio of 1.02, which was lower than the 1.05 mentioned above, and more than one turn occurred. Therefore, although yarns 8 to 11 and yarns 13 to 16 show improved knot strength, yarns 1 to 7, yarn 12 and yarns 17 to 19 are superior in terms of roundness and rotation, making them easier to handle as finished fishing lines. Furthermore, it can be seen from the data for yarn 11 and yarn 16 that it is preferable to set the number of twists in the first twist to 1000 T / M in order to reduce the probability of yarn breakage and improve yield.

[0061] [Table 3]

[0062] [Table 4]

[0063] Next, we will explain the yarn formed by the first manufacturing method. We mainly used yarns that satisfied the conditions of the fourth invention of this application (the invention for claim 4 in the scope of claims) in terms of the denier number, the number of twists and twist ratio between the top and bottom, and the circularity, and we conducted tests by changing the conditions for attaching the coating resin. The test results are shown in Tables 3 and 4, which show data for 13 yarns, Yarns 26 to 38. In Tables 3 and 4, in the raw yarn column, VC indicates polyarylate (Vectran HT220T40) and PE indicates ultra-high molecular weight polyethylene (Dyneema SK40). That is, yarns 26 to 38 used polyarylate (Vectran HT220T40) as the raw yarn, and yarns 32 and 33 used ultra-high molecular weight polyethylene (Dyneema SK40) as the raw yarn. Items not specifically stated are the same as those for the first manufacturing method (Yarns 17 to 18) in Table 1 above. As shown in Table 3, the same tests as those shown in Table 1 were conducted on Yarns 26 to 38, except for the roundness. As shown in Table 3, a 250 denier filament (raw yarn) was used for all of the yarns. Furthermore, for each of the yarns shown in Table 3, the twist number for the first twist was 726 T / M, and the twist number for the second twist was 507 T / M (the twist number ratio for both was 1.43). As shown in Table 3, regarding the rotation, each of the yarns in Table 3 (Yarn 26, Yarn 27, Yarn 29, Yarn 30, Yarn 32, Yarn 34, and Yarns 36 to 38) obtained a good result of less than one rotation. The surface smoothness (speed) shown in Table 4 will be explained below. As shown in Figure 1, one end of a fishing line 100 (Example and Comparative Examples) was fixed (fixed end 1a), and the other end 1b was attached with a weight 2. The weight 2 was suspended from a pulley 3 so that the line 100 was at a 10-degree angle (elevation angle θ) relative to the horizontal. The weight of the weight 2 was set so that a tension of 1 g was applied per denier of line. The length w0 of the fishing line 100 from the fixed end 1a to the pulley 3 was set to 300 cm (3 m). A circular sliding weight 4 was threaded through the fishing line 100, and the line 100 was slid from the pulley 3 to the fixed end 1a of the fishing line 100, and the time (seconds) for sliding was measured. The sliding weight 4 was made of metal and weighed 0.4 g. Specifically, a paper clip (small paper clip manufactured by Kokuyo) used for holding paper was used. The shorter the measurement time, the better the surface smoothness (the smoother the line surface). In the evaluation of Table 4, those with good adhesiveness were rated as ○. Specifically, the yarns of the examples and comparative examples were twisted alternately in the S direction and Z direction to the extent that they formed twist balls (10 twists / cm for 250 denier yarn). After repeating this twisting five times, those that were visually inspected for the absence of yarn cracks or fluff were rated as ○. The amount of resin solids attached was also measured, as shown in Table 4. To measure the amount of resin solids attached, the weight (denier) of a given length of filament was measured at room temperature (22°C to 24°C, relative humidity 63% to 67%) before resin attachment. After the resin was attached and dried (after the entire process was completed), the filament was left for 24 hours, and the weight (denier) of the yarn (after resin attachment and drying) was measured. The measurement was performed by placing 90 cm of the filament to be measured on an electronic balance. Since 1 g of yarn is 1 denier per 9000 m, the value measured above was converted to 9000 m and used as the measured weight.

[0064] The examples shown in Tables 3 and 4 will be specifically described below. For the coating resin for yarn 26, a solution containing 90 parts by weight of PP Coat HV (HV) and 10 parts by weight of FH-123 (polyester resin) (total: 100 parts by weight) and the same weight of Die Reducer PA No. 20 (solvent) was used. The resin solids (resin weight ratio after drying) were 0.135 parts by weight of HV and 0.030 parts by weight of polyester resin relative to 1 part by weight of the coating resin liquid (total: 0.165). The amount of resin solids attached was 40 parts by weight per 100 parts by weight of raw yarn (total: 140 parts by weight / 40% of attached amount relative to yarn weight). This yarn 26 had a tensile strength of 7.23 kg, a tensile strength of 28.29 g / d (grams / denier, the same applies below), a tensile elongation of 3.42%, a knot strength of 3.26 kg, a knot strength of 13.04 g / d, and a knot elongation of 1.97%.

[0065] For yarn 27, a resin solution containing 70 parts by weight of PP Coat HV (HV) and 30 parts by weight of FH-123 (polyester resin) (total: 100 parts by weight) and an equal weight of Die Reducer PA No. 20 (solvent) was used as the coating resin solution. The resin solids content was 0.105 parts HV and 0.09 parts polyester resin (total: 0.195) per 1 part of the coating resin solution. The amount of resin solids attached was 45 parts by weight per 100 parts by weight of raw yarn (total: 145 parts by weight / 45% weight ratio of attached amount to yarn). This yarn 27 had a tensile strength of 7.19 kg, a tensile strength of 28.76 g / d (grams / denier, the same applies below), a tensile elongation of 3.59%, a knot strength of 3.42 kg, a knot strength of 13.68 g / d, and a knot elongation of 2.23%.

[0066] For yarn 29, a solution containing 30 parts by weight of a resin solution containing 90 parts by weight of PP Coat HV (HV) and 10 parts by weight of FH-123 (polyester resin) (total 100 parts by weight) and 70 parts by weight of Die Reducer PA No. 20 (solvent) (total 100 parts by weight) was used as the coating resin solution. The resin solids content was 0.081 parts by weight of HV and 0.018 parts by weight of polyester resin (total 0.099 parts by weight) relative to 1 part by weight of the coating resin solution. The amount of resin solids attached was 20 parts by weight per 100 parts by weight of raw yarn (total 120 parts by weight / 20% weight ratio of attached amount to yarn). Yarn 29 had a tensile strength of 7.24 kg, a tensile strength of 28.96 g / d, a tensile elongation of 3.47%, a knot strength of 3.22 kg, a knot strength of 12.88 g / d, and a knot elongation of 2.11%.

[0067] For the yarn 30, a solution containing 20 parts by weight of a resin solution consisting of 90 parts by weight of PP Coat HV (HV) and 10 parts by weight of FH-123 (polyester resin) (total 100 parts by weight) and 80 parts by weight of Die Reducer PA No. 20 (solvent) (total 100 parts by weight) was used as the coating resin solution. The resin solids content was 0.054 parts by weight of HV and 0.012 parts by weight of polyester resin (total 0.066 parts by weight) per 100 parts by weight of the raw yarn. The amount of resin solids attached was 15 parts by weight (total 115 parts by weight / 15% weight ratio of attached amount to yarn weight). This yarn 30 had a tensile strength of 7.27 kg, a tensile strength of 29.08 g / d, a tensile elongation of 3.39%, a knot strength of 3.16 kg, a knot strength of 12.64 g / d, and a knot elongation of 2.19%.

[0068] For the yarn 34, a coating resin solution containing 100 parts by weight of a resin solution consisting of 70 parts by weight of FH-123 (polyester resin) and 30 parts by weight of Die Reducer PA No. 20 (solvent) (total 100 parts by weight), and 3 parts by weight of glycerin (total 103 parts by weight) was used. The resin solids content was 0.42 parts (polyester resin) per 1 part of the coating resin solution. The amount of resin solids attached was 40 parts by weight per 100 parts by weight of the raw yarn (total 140 parts by weight / 40% weight ratio of attached amount to yarn). This yarn 34 had a tensile strength of 7.06 kg, a tensile strength of 28.24 g / d, a tensile elongation of 3.52%, a knot strength of 3.54 kg, a knot strength of 14.16 g / d, and a knot elongation of 2.09%.

[0069] For the yarn 36, a coating resin solution containing 100 parts by weight of a resin solution consisting of 70 parts by weight of FH-123 (polyester resin) and 30 parts by weight of Die Reducer PA No. 20 (solvent) (total 100 parts by weight), and 3 parts by weight of liquid paraffin (total 103 parts by weight) was used. The resin solids content was 0.42 parts (polyester resin) per 1 part of the coating resin solution. The amount of resin solids attached was 42 parts by weight per 100 parts by weight of the raw yarn (total 142 parts by weight / 42% weight ratio of attached amount to yarn). This yarn 36 had a tensile strength of 7.31 kg, a tensile strength of 29.24 g / d, a tensile elongation of 3.54%, a knot strength of 3.88 kg, a knot strength of 15.52 g / d, and a knot elongation of 2.00%.

[0070] For yarn 37, only Permarin UA-310 (polyurethane resin emulsion) was used as the coating resin liquid (100% polyurethane resin emulsion). The resin solid content was 0.39 parts (polyurethane resin) per 1 part of the coating resin liquid. The amount of resin solid attached was 40 parts by weight per 100 parts by weight of raw yarn (total 140 parts by weight / 40% weight ratio of attached amount to yarn). This yarn 37 had a tensile strength of 7.39 kg, a tensile strength of 29.56 g / d, a tensile elongation of 3.51%, a knot strength of 3.87 kg, a knot strength of 15.48 g / d, and a knot elongation of 2.01%.

[0071] For the yarn 38, only Movinyl 975N (styrene / acrylic emulsion) was used as the coating resin liquid (the styrene / acrylic emulsion was 100%). The resin solid content was 0.45 parts by weight (styrene resin + acrylic resin) relative to the coating resin liquid 1 part. The amount of resin solid content attached was 40 parts by weight per 100 parts by weight of the raw yarn (total 140 parts by weight / 40% weight ratio of attached amount to yarn). This yarn 38 had a tensile strength of 7.24 kg, a tensile strength of 28.96 g / d, a tensile elongation of 3.48%, a knot strength of 3.90 kg, a knot strength of 15.60 g / d, and a knot elongation of 1.98%.

[0072] For the coating resin solution for yarn 28, a solution containing 50 parts by weight of PP Coat HV (HV) and 50 parts by weight of FH-123 (polyester resin) (total: 100 parts by weight) and the same weight of Die Reducer PA No. 20 (solvent) was used. The resin solids content was 0.075 parts by weight of HV and 0.15 parts by weight of polyester resin (total: 0.225) per 1 part by weight of the coating resin solution. The amount of resin solids attached was 53 parts by weight per 100 parts by weight of raw yarn (total: 153 parts by weight / 53% weight ratio of attached amount to yarn).

[0073] For the coating resin solution for yarn 31, a solution containing 70 parts by weight of a resin solution consisting of 90 parts by weight of PP Coat HV (HV) and 10 parts by weight of FH-123 (polyester resin) (total 100 parts by weight) and 30 parts by weight of Die Reducer PA No. 20 (solvent) (total 100 parts by weight) was used. The resin solids content was 0.189 parts by weight of HV and 0.042 parts by weight of polyester resin (total 0.231) relative to the above coating resin solution 1. The amount of resin solids attached was 55 parts by weight per 100 parts by weight of raw yarn (total 155 parts by weight / 55% of attached amount to yarn weight ratio).

[0074] For the coating resin solution for the yarn 32, a solution containing 20 parts by weight of a resin solution consisting of 90 parts by weight of PP Coat HV (HV) and 10 parts by weight of FH-123 (polyester resin) (total 100 parts by weight) and 80 parts by weight of Die Reducer PA No. 20 (solvent) (total 100 parts by weight) was used. The resin solids content was 0.054 parts by weight of HV and 0.012 parts by weight of polyester resin (total 0.066) per 100 parts by weight of the raw yarn. The amount of resin solids attached was 13 parts by weight (total 113 parts by weight / 13% of attached amount to yarn weight). Yarn 32 had a tensile strength of 7.29 kg, a tensile strength of 29.16 g / d, a tensile elongation of 5.11%, a knot strength of 3.43 kg, a knot strength of 13.72 g / d, and a knot elongation of 2.25%.

[0075] For the coating resin solution for yarn 33, 70 parts by weight of a resin solution containing 90 parts by weight of PP Coat HV (HV), 10 parts by weight of FH-123 (polyester resin) (total 100 parts by weight), and 30 parts by weight of Die Reducer PA No. 20 (solvent) (total 100 parts by weight) were used. The resin solids content was 0.189 parts by weight of HV and 0.042 parts by weight of polyester resin (total 0.231) relative to the above coating resin solution 1. The amount of resin solids attached was 55 parts by weight per 100 parts by weight of raw yarn (total 155 parts by weight / 55% attached amount to yarn weight ratio).

[0076] For the yarn 35, a solution of 100 parts by weight of FH-123 (polyester resin) and 3 parts by weight of glycerin (total 103 parts by weight) was used as the coating resin liquid. The resin solid content was 0.6 (polyester resin) per 1 part of the above coating resin liquid. Furthermore, the amount of resin solid content attached was 55 parts by weight per 100 parts by weight of raw yarn (total 155 parts by weight / adhesion amount to yarn weight ratio 55%).

[0077] The amount of resin attached (solid content) of the above-mentioned yarn 28 was 53 parts by weight, which is more than 50 parts by weight, relative to 100 parts by weight of the raw yarn, and when first twisted, the yarn broke. Similarly, the amount of resin attached (solid content) of the above-mentioned yarn 31, yarn 33, and yarn 35 was 55 parts by weight, which is more than 50 parts by weight, relative to 100 parts by weight of the raw yarn, and when first twisted, the yarn broke. The above-mentioned yarn 32 had an amount of resin attached (solid content) of 13 parts by weight, which was more than 15 parts by weight, per 100 parts by weight of raw yarn, and multiple yarn cracks were observed, indicating slightly poor adhesiveness. In contrast, the amount of resin attached (solid content) per 100 parts by weight of the raw yarn was in the range of 15 to 50 parts by weight for Yarn 26, Yarn 27, Yarn 29, Yarn 30, Yarn 34, and Yarns 36 to 38, in particular, and the adhesion was good and no cracks or fuzz were observed. After repeating twisting five times in the S direction and Z direction to the extent that twist balls were formed, Yarns 26, 27, 29, 30, Yarn 34, and Yarns 36 to 38 were visually confirmed to have no cracks or fuzz. Even after repeating the twisting 200 times, no cracks or fuzz were observed for these yarns. Therefore, it can be confirmed that the above-mentioned yarns, which are coated with resin in an amount (solid content) ranging from 15 to 50 parts by weight per 100 parts by weight of raw yarn, have extremely excellent resin adhesion compared to other yarns. In the above, the data on the solid content of the resin in the broken yarn was obtained by air drying, since the broken yarn could not be dried by baking.

[0078] Furthermore, although not shown in the table, in order to consider the roundness, experiments were conducted and examined on a comparative example (yarn 40) that was coated with resin and twisted in only one direction, and an example (yarn 39) that was twisted in a different direction while keeping the other conditions the same as the yarn twisted in only one direction. The significance of this experiment is that when manufacturing the yarn according to the present invention, even if the filaments are twisted in one direction during manufacturing and then further twisted in a different direction, untwisting occurs over time, and the final product may only have the difference in twist between the first twist and the second twist. The purpose of this experiment is to confirm whether such a yarn (yarn 39) has an advantage in terms of circularity compared to a yarn in which the original yarn is twisted in only one direction by the difference in twist from the beginning. The raw yarn for both the yarn 39 and the yarn 40 was a 250 denier polyarylate multifilament, specifically Vectran HT220 40. Then, processing was carried out using the first manufacturing method described above. After the yarn 39 was produced, the cross section was observed under a microscope and it was confirmed that the final twist had hardly been fixed (had disappeared) due to untwisting.

[0079] The yarn 39 had a twist number of 726 T / M in the first twist and 507 T / M in the second twist, with a ratio of the upper and lower twist numbers being 1.43. As a result, the circularity of the yarn 39 was 1.12. On the other hand, the number of twists (first twist) of yarn 40 was set to 210 T / M (≒ 726 T / M - 507 T / M). As a result, the circularity of yarn 40 was 1.35. For these yarns 39 and 40, the manufacturing conditions not specifically stated are the same as those for yarns 26 to 38 in Tables 3 and 4 above. As mentioned above, looking at thread 40, the roundness is 1.35, which is significantly higher than 1.25. This indicates that the surface is extremely flat. Therefore, using such fishing line raises the risk of line trouble. On the other hand, thread 39, which has undergone some reversal and only has the primary twist remaining, has a good roundness of 1.12. This shows that even if the final product has some reversal due to the primary twist and the secondary twist, the final product's roundness can be ensured by applying twists in the specified two directions (primary twist and secondary twist) during manufacturing. Therefore, it can be confirmed that, even under the same conditions for the final product, thread 39, which is twisted in a different direction during the manufacturing process, is easier to handle as a fishing line than thread 40, compared to the case of single twist.

[0080] Also, as above, although not shown in the table, the fishing line manufactured by the second manufacturing method is shown as line 41, and the fishing line manufactured by the fourth manufacturing method is shown as line 42. The yarn 41 was made using Dyneema yarn. In the coating process, a resin containing 100 parts by weight of urethane resin (Polyurex Sanding Sealer X-222E) and 10 parts by weight of solvent (Die Reducer PA No. 20) (total: 110 parts by weight) was used as the coating resin. The amount of the resin applied to the yarn 41 after drying was 20 parts by weight per 100 parts by weight of the yarn. In addition, in the resin application process for the yarn 41, a resin containing 30 parts by weight of HV (PP Coat HV) and 70 parts by weight of solvent (Die Reducer PA No. 20) (total: 100 parts by weight) was used as the coating resin. The amount of the resin applied to the yarn 41 after drying was 20 parts by weight per 100 parts by weight of the yarn. Therefore, the total amount of resin applied to the yarn 41 after drying in the coating and resin application processes was 40 parts by weight per 100 parts by weight of the yarn. In the drying process of the yarn 41, baking was performed with dry heat at 180°C, and in the secondary drying process, baking was performed with dry heat at 150°C. This yarn 41 had a first twist of 720 T / M and a second twist of 501 T / M, with a twist ratio of 1.44. This yarn 41 had a tensile strength of 7.05 kg, a tensile strength of 28.30 g / d, a tensile elongation of 4.99%, a knot strength of 3.67 kg, a knot strength of 14.56 g / d, a knot elongation of 1.83%, and a circularity of 1.11. Unless otherwise specified, the manufacturing conditions were the same as those for the yarns shown in Tables 3 and 4 above.

[0081] The yarn 42 uses Dyneema as the raw yarn, and in the coating process, a resin composed of 50 parts by weight of urethane resin (Polyurex Sanding Sealer X-222E) and 50 parts by weight of ester (FH-123) (total 100 parts by weight) was used as the coating resin. The amount of the resin attached after drying was 20 parts by weight per 100 parts by weight of the raw yarn. In addition, in the resin addition process, a resin composed of 30 parts by weight of urethane resin (Polyurex Sanding Sealer X-222E) and 70 parts by weight of acrylic resin (PolyAutoClear) (total 100 parts by weight) was used as the coating resin. The amount of the resin attached after drying was 20 parts by weight per 100 parts by weight of the raw yarn. Therefore, the total amount of resin attached after drying from the coating process and the resin attachment process is 40 parts by weight per 100 parts by weight of the raw yarn. In the drying process, baking was carried out with dry heat at 180°C, and in the secondary drying process, baking was carried out with dry heat at 150°C. This yarn 42 had a first twist of 729 T / M and a second twist of 510 T / M, with a twist ratio of 1.43. This yarn 42 had a tensile strength of 7.06 kg, a tensile strength of 28.22 g / d, a tensile elongation of 4.50%, a knot strength of 3.77 kg, a knot strength of 14.51 g / d, a knot elongation of 1.81%, and a circularity of 1.13. For this yarn 42, the manufacturing conditions, unless otherwise specified, were the same as those for the yarns shown in Tables 3 and 4 above.

[0082] From these threads 41 and 42, it can be seen that the fishing lines manufactured using the above manufacturing method 2 and manufacturing method 4 also have significantly improved knot strength compared to the comparative examples (threads 20 to 25) shown in Table 2, and further, good results are obtained in terms of roundness.

[0083] Furthermore, Table 5 shows the results of tests conducted on the denier of the raw yarn, the number and twist ratio of the upper and lower twists, and the circularity of the yarns formed by the first manufacturing method, with different coating resins.

[0084] [Table 5]

[0085] Yarns 43 to 45 shown in Table 5 all use Dyneema SK40 as the raw yarn, which is an ultra-high molecular weight polyethylene multifilament. The multifilament used for yarns 43 to 45 is 250 denier. In all of the yarns 43 to 45, the twist number of the first twist is 545 T / M and the twist number of the second twist is 380 T / M, and the ratio of the twist numbers of the top and bottom twists is 1.43.

[0086] The thread 43 was coated with a resin containing polyethylene emulsion. Specifically, the thread 43 was coated with the above-mentioned Nalcoat JW PE301. As shown in Table 5, this yarn 43 had a tensile strength of 7.31 kg, a tensile strength of 29.24 g / d, a tensile elongation of 4.88%, a knot strength of 3.63 kg, a knot strength of 14.52 g / d, and a knot elongation of 2.01%. The yarn 44 was coated with a hot-melt polyamide emulsion. Specifically, Grirltex 1500A was used as the yarn 44. As shown in Table 5, yarn 44 had a tensile strength of 7.19 kg, a tensile strength of 28.76 g / d, a tensile elongation of 4.39%, a knot strength of 3.77 kg, a knot strength of 15.08 g / d, and a knot elongation of 1.95%. The yarn 45 was coated with a resin containing ethylene acrylic acid copolymer sodium salt. Specifically, the yarn 45 was coated with Zyxene-N. As shown in Table 5, yarn 45 had a tensile strength of 7.23 kg, a tensile strength of 28.92 g / d, a tensile elongation of 4.33%, a knot strength of 3.62 kg, a knot strength of 14.48 g / d, and a knot elongation of 1.99%.

[0087] As can be seen from Table 5, the rotation of the above-mentioned lines 43 to 45 was investigated using the same method as that used in Table 1, and good results were obtained. In other words, it can be seen that lines 43 to 45 have little line trouble when used as fishing lines. Note that the manufacturing conditions for these lines 43 to 45, unless otherwise specified, are the same as those for the lines shown in Tables 3 and 4 above. For the yarn 43, Narcote JW PE301 was used, and therefore a calcination step was carried out after the first twisting step and before the final twisting step. For this yarn 43, baking was carried out with dry heat at 80°C in the calcination step. The adhesiveness evaluation in Table 4 above was performed on yarn 43, and no yarn cracks or fuzz were observed even after twisting the yarn 200 times alternately in the S direction and Z direction to the extent that twist balls were formed. Although not shown in the table, yarn 46 was also investigated, which did not undergo a calcination process. This yarn 46 was produced under the same conditions as yarn 43, except that it did not undergo the calcination process. Specifically, for yarn 46, manufacturing method 1 was employed, with 250 denier Dyneema SK40 as the raw yarn and Nalcoat JW PE301 as the coating resin. This yarn 46 had a first twist of 545 turns / m and a final twist of 380 turns / m. The twist ratio between the first twist and the final twist was 1.43. As a result, this yarn 46 had a tensile strength of 7.18 kg, a tensile strength of 28.72 g / d, a tensile elongation of 4.38%, a knot strength of 3.60 kg, a knot strength of 14.38 g / d, and a knot elongation of 2.00%. However, when the yarn had the same adhesiveness as yarn 43, it was twisted 100 times alternately in the S direction and Z direction to the extent that twist balls were formed, and yarn cracking and fluffing were observed. Furthermore, even when Narcoat JW PE301 was subjected to a pre-baking process at a temperature below 65°C, such as 60°C (other conditions were the same as for yarn 43), the above-mentioned adhesiveness was examined by twisting the yarn 100 times alternately in the S direction and Z direction to the extent that twist balls were formed, and yarn cracking and fuzzing were observed. As described above, although there are differences in the individual characteristics of the yarns of the examples of the present invention, a significant improvement in knot strength was observed overall compared to the yarns of the comparative examples. [Explanation of symbols]

[0088] 1a fixed end 1b other end 2 weights 3 Pulleys 4. Sliding weights 100 fishing line w0 100 length of fishing line θ elevation angle

Claims

1. The multifilament is twisted in two different directions, and a coating resin coats the surface of the multifilament. The multifilament is twisted in one direction by a first twist, and further twisted in a direction opposite to the first twist without doubling with other yarns, The thickness of each of the plurality of single yarns constituting the multifilament is 0.8 dtex or more and 2.5 dtex or less, the ratio of the number of twists of the first twist to the second twist is 1.05 or more and 2.5 or less, and the number of twists of the first twist is 180 to 1000 T / M, the coating resin is a thermoplastic resin, the amount of the coating resin attached is 15 to 50 parts by weight per 100 parts by weight of the filament, and the aspect ratio is 1 to 1.

25.

2. 2. The yarn according to claim 1, wherein the multifilament is mainly composed of ultra-high molecular weight polyethylene or polyarylate.

3. 3. The yarn according to claim 2, wherein the coating resin is attached to or impregnated into the surface of the multifilament or between the individual yarns constituting the multifilament.

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