JP7217871B2 - fishing line - Google Patents

Description

TECHNICAL FIELD The present invention relates to a fishing line composed mainly of a fluorocarbon resin that exhibits excellent knotting properties and high knot strength. More specifically, when the knot is formed, the thread loops smoothly converge to avoid uneven tightening, and when tensile stress is applied in the actual fishing scene, the knot tightens uniformly in a self-compensating manner to reduce the stress along the length of the line. The present invention relates to a fishing line that disperses in a direction and exhibits high binding strength.

In the past, wild silk and silk were used as materials for fishing lines and fishing nets, which are materials for fisheries. From this point of view, nylon, fluorocarbon, polyolefin, etc. are widely used nowadays.

In particular, fluorocarbon (polyvinylidene fluoride), which appeared in the 1970s, has a strong polymer molecular structure and is resistant to "root slippage" that rubs against obstacles in the water, and is resistant to scratches. Widely used for lines. In addition, since it has low water absorption, it does not deteriorate easily, and since it has less thread elongation than nylon, it is highly sensitive and makes it easy to catch small fish. It is rare.

On the other hand, due to the crystallinity and high elastic modulus derived from the fiber structure, it is more rigid than other synthetic fibers such as nylon, and can be used for fishing hooks such as needles and sarkans, and for tying strings. In some cases, it is difficult to tie a uniform knot, and it is easy to cause crimps, so a certain amount of skill is required for anglers. In addition, when used as a road thread by winding it around a reel, there is a drawback that it tends to get curled after being wound on a spool or reel. There was a problem such as frequent occurrence of backlash starting from the attached crease. In this way, the fishing line is rigid, lacks straightness, and is prone to line curling, which not only reduces the ease of handling, but also causes unnatural movement of the lure and fishing bait, resulting in a loss of fishing results. was

In order to improve the knot strength, flexibility, and physical properties of these fluorocarbon fishing lines, monofilaments made of vinylidene fluoride copolymers and compositions containing vinylidene fluoride copolymers containing 1% by mass or more of comonomer components are used. A monofilament made of a material has already been proposed (Patent Documents 1 and 2). Although these monofilaments are certainly flexible, they are prone to frictional heat damage when forming knots due to their low melting point, and they are prone to uneven tightening due to their flat surface conditions. When a tensile tension is applied, the line may break at low tension without demonstrating its original strong performance, which has plagued anglers.

Here, "strong and unbreakable" is one of the properties demanded by anglers for an ideal fishing line. In most actual fishing scenes, the part where the fishing line breaks is a knot. This is because tensile, compressive, and shearing forces are concentrated on the knots of the line, and a strong fishing line cannot be obtained simply by pursuing linear strength of the line.

On the other hand, as a durability index for knots, there is knot strength defined in JIS L 1013 (2010 version), and the knot method is a round knot. In the actual fishing scene, the fishing line is not used in a round knot, and there is a reality that does not represent the actual situation.

In order to realize a "truly strong line", it is important to efficiently disperse the stress applied to the binding part throughout the yarn and maximize the strength potential of the line, without damaging the yarn. Smooth nodule formation and uniform absorption of stress subsequently applied are key points.

Japanese Patent Publication No. 5-33059 WO2002/064867

An object of the present invention is to solve the above problems and to provide a fluorocarbon fishing line that exhibits excellent binding properties and high binding strength, which has not been possible with conventional techniques. More specifically, when the knot is formed, the thread loops smoothly converge to avoid uneven tightening, and when tensile stress is applied in the actual fishing scene, the knot tightens uniformly in a self-correcting manner, resulting in high binding strength. It relates to a fishing line that expresses

A monofilament made of a fluorocarbon resin, having streak-like grains on the surface of the fiber along the direction of the fiber axis, and having a surface roughness RzJIS of 0.10 μm or more and 2.00 μm or less. can solve the above problems.

According to the present invention, it is possible to provide a fluorocarbon fishing line that exhibits excellent binding properties and high binding strength. More specifically, when the knot is formed, the thread loops smoothly converge to avoid uneven tightening, and when tensile stress is applied in the actual fishing scene, the knot tightens uniformly in a self-compensating manner to reduce the stress along the length of the line. It is possible to obtain a fishing line that disperses in a direction and develops high binding strength.

It is an example of the fiber surface analysis photograph of the monofilament of the present invention. It is an example of a strength-elongation curve in evaluating the smoothness of the monofilament of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail.

The resin used for the fishing line of the present invention is mainly composed of fluorocarbon resin (polyvinylidene fluoride). The polymerization method for producing the fluorocarbon resin used in the present invention may be either emulsion polymerization or suspension polymerization. It is preferable to use an emulsion polymerized product when the flexibility is important as the performance of the fishing line, and a suspension polymerized product when the strength is important. It is also possible to use a mixture of both in order to achieve a balance between flexibility and strength. The main component here refers to a component that is contained in the monofilament in an amount of 60% by mass or more, and for the reasons described below, it is preferably 70% by mass or more, more preferably 80% by mass or more, and 90% by mass. It is more preferable if it is equal to or greater than the mass.

In order to make a monofilament that has both high strength and flexibility as a fishing line, the weight average molecular weight is preferably 300,000 or more and 600,000 or less, preferably 330,000 or more and 550,000 or less, more preferably 350,000 or more and 500,000 or less. It is easy to obtain excellent spinning properties and strength.

Such a resin provides the best strength properties when used as a homopolymer, but a small amount of a third component may be copolymerized or added to the extent that the object of the present invention is not hindered. For example, a modification method can be used in which a copolymer component containing a peroxy group as a plasticizer is graft-polymerized and crosslinked as a fluororubber. Functional agents such as pigments, dyes, and fluorescent brighteners may also be blended. However, if such a functional agent is incompatible with the polymer, care must be taken because the fluorocarbon tends to become porous and the strength characteristics are likely to be impaired.

The fishing line of the present invention made of the above polymer is a monofilament having streak-like grains on the fiber surface along the fiber axis direction and a ten-point average roughness Rz JIS of the fiber surface of 0.10 μm or more and 2.00 μm or less. It is necessary. If the RzJIS is less than 0.10 μm, the desired smooth binding property cannot be obtained, and the binding strength decreases due to uneven tightening. On the other hand, if the RzJIS exceeds 2.00 μm, the unevenness of the stripes themselves becomes a weak point, and a satisfactory binding strength cannot be obtained. It is preferably 0.15 μm or more and 1.50 μm or less, more preferably 0.20 μm or more and 1.00 μm or less. The definition of RzJIS is as specified in the standard of JIS B 0601 (2001 version).

In addition, if the grains on the surface of the fiber are arranged regularly in a streaky pattern, it is easy to obtain a smooth knotting property. If the spinning design is such that the index Str representing the aspect ratio of the streaks is 0.10 or less, it is easy to obtain smoothness and knotability at each level, and it is more preferably 0.08 or less. Str is an index representing the isotropy or anisotropy of the surface texture and takes a numerical value of 0-1. The closer this value is to 0, the higher is the directional regularity of the streaks, and the closer to 1 is, the more random the unevenness of the surface does not depend on the directionality. Note that the definition of Str is as specified in the ISO 25178 standard.

Although the diameter of the monofilament is not particularly limited, a diameter of 0.05 to 2.0 mm is suitable because it can be used as both a Harris and a guide thread. It is preferably 0.5 to 1.0 mm, more preferably 0.5 to 0.7 mm. If the fishing line of the present invention is used as a fishing line, it is possible to suppress knot spots with metal fittings such as needles and sarkans, and it is possible to obtain knot strength with little variation. can be done. Since the knot can be tightened smoothly, even beginners can use it with confidence, and it can also handle complicated knots preferred by advanced users. On the other hand, if it is used as a road thread, it not only has good thread-to-thread knotting properties with Harris, but also has good guide slipperiness, so when cast with a reel rod, it is possible to increase the flight distance of the tackle.

Here, the mechanism by which the fishing line of the present invention can smoothly tighten the binding portion with little uneven tightening of the knot will be described. Although the detailed mechanical mechanism is not yet clear, as a result of observing the process from binding to breaking with a high-speed camera, we have confirmed that the yarn itself corrects the knot. In other words, when tensile tension is applied to the knot, the entire thread part forming the knot slides along with the gentle elongation little by little, and the knot becomes smaller as the thread tightens itself, firmly locking. It is the behavior to go. As a result, the tension is evenly distributed in the direction of the entire length, and it is speculated that the inherent strength performance of the yarn can be efficiently utilized as the knot strength. These are different from the conventional method of drawing out the binding strength based on the strengthening of the grip by increasing the friction, both in terms of design concept and expression mechanism.

The monofilament of the present invention can be efficiently produced by the melt spinning method described below. When melting the resin, the usual conditions using an extruder-type spinning machine can be adopted, and the melting temperature is preferably set to the melting point of the polymer plus the range of 50 to 110°C. A range of 50°C to 90°C plus the melting point is particularly excellent in terms of ensuring both the fluidity of the polymer and the suppression of thermal deterioration. The extrusion pressure of the extruder is preferably 2 to 30 MPa, more preferably 20 MPa or less in order to suppress shear heat generation by the screw. The spinneret hole diameter is 0.1 to 20 mm, the spinning speed is 0.3 to 100 m/min, and other conditions can be appropriately selected according to the thickness of the desired monofilament.

The monofilament spun from the spinneret is then cooled in a cooling bath after passing through a short gas zone. The cooling medium used here is a liquid inert to the polymer, usually water, glycerin, polyethylene glycol, and the like. At this time, it is preferable that the gas zone is provided with a heat-retaining zone heated to an ambient temperature of 100 to 150° C. above the melting point of the polymer, and the cooling medium is preferably at a temperature of 100° C. or more below the melting point of the polymer. Furthermore, it is desirable that the running distance of the yarn in the room temperature environment from the spinneret or the lower end of the heat insulating zone to the liquid surface of the cooling medium is 10 cm or less. Within these ranges, the extruded polymer can be led to the cooling medium while maintaining high heat, and rapidly cooled and solidified from the surface layer of the yarn, creating a large temperature gradient from the surface layer to the core of the fiber. be able to. Due to this temperature gradient, after the surface layer solidifies first, the core part is later solidified with volume shrinkage, resulting in a so-called skin-core structure, which tends to form streaky grains on the fiber surface. When it is desired to form deep grains, it is possible to increase the temperature gradient, and it is preferable to shorten the room temperature environment distance according to the diameter of the fiber to be obtained. Further, when the draft ratio obtained by dividing the speed of the first take-up roll by the linear velocity of polymer discharge from the spinneret is 15 times or less, preferably 10 or less, monofilaments having a uniform fiber diameter in the longitudinal direction can be easily obtained.

The cooled and solidified monofilament is subsequently sent to the drawing section, and the atmosphere (bath) for drawing and heat setting includes hot water, a heated heat medium bath such as polyethylene glycol, glycerin and silicone oil, a hot gas bath and a steam bath. etc. are preferably used. The drawing process may be performed in one stage or in multiple stages, but the total draw ratio is usually 5.0 times or more, preferably 5.5 times or more, to obtain a high-strength monofilament. Cheap.

After stretching, if necessary, for the purpose of removing stretching strain, a suitable lengthening and/or relaxation heat treatment can be performed.

The monofilament of the present invention may be colored or dyed after spinning or during spinning using existing methods. Also, a finishing oil or the like may be applied to the surface of the monofilament. Furthermore, the outer shape of the monofilament of the present invention is not necessarily limited to a circular cross-section, and may have any shape such as a triangular cross-section, a square cross-section and a multi-lobed cross-section.

EXAMPLES The present invention will be described in more detail below with reference to Examples, but the present invention is not limited to these Examples. Each item in the examples was measured by the following methods. In addition, the evaluation was carried out with n=1 for measurements not specifically described with respect to the number of evaluations n.

(1) Yarn diameter A digital micrometer manufactured by MITUTOYO was used to randomly measure the diameter of the monofilament at 5 points along its length, and the average value was obtained.

(2) Fineness Measured according to JIS L 1013 (2010 version).

(3) Tensile strength, elongation Measured according to JIS L 1013 (2010 version). That is, after leaving the sample collected in a skein shape for 24 hours in an atmosphere with a temperature of 20 ° C. and a humidity of 65% RT, using a Tensilon RTM 500 type tensile tester manufactured by Orientec Co., Ltd., a test length of 250 mm and a tensile speed of 300 mm / min. Three measurements were made under the conditions, and the average value was obtained.

(4) Binding strength Three specimens were prepared by knotting No. 10 Sarkan with double clinch knots, left for 24 hours in an atmosphere at a temperature of 20 ° C. and a humidity of 65% RT, and then Tensilon RTM500 model manufactured by Orientec Co., Ltd. Using a testing machine, three measurements were made under conditions of a test length of 250 mm and a tensile speed of 300 mm/min, and the average value was obtained. A value of 4.5 cN/dtex or more was considered acceptable.

(5) Surface roughness: Rz, RzJIS, Str
Using a shape analysis laser microscope VK-X1000 (head part VK-X1100) manufactured by Keyence Corporation, the shape of the sample deoiled from the surface oil was measured and analyzed. As analysis software, an analysis function extension module VK-H1XP was used.

(6) Knot smoothness After leaving the sample in an atmosphere of temperature 20 ° C. and humidity 65% RT for 24 hours, a single round knot is formed in the manner of the knot strength test shown in JIS L 1013 (2010 version). Then, using a static and dynamic friction measuring device TL201Tt manufactured by Trinity Lab Co., Ltd., it was pulled under the conditions of a measurement distance of 50 mm and a tensile speed of 0.5 mm/sec, and the stress fluctuation until the round ring closed was measured and evaluated. A sample without vertical fluctuation of stress due to stick-slip until the round ring was closed was judged to be acceptable.

(7) Actual fishing evaluation Ten experienced anglers were asked to evaluate actual fishing as Harris, and the feeling of use was evaluated according to the following three-level criteria, and the rank that received the most votes was scored. The pass level is ○.
◯◯: Satisfactory in knotting, strength, flexibility and durability, suitable for fishing.
◯: Fishing is possible although there is a problem with knotting, strength/flexibility/durability.
x: There was a serious problem in any of knotting property, strength/flexibility/durability, and it was impossible to continue fishing, or it was not suitable for fishing.

(Example 1)
A fluorocarbon homopolymer produced by suspension polymerization and having a weight average molecular weight of 370,000, a number average molecular weight of 190,000, and a melting point of 177°C is melted at 265°C, melt-spun through a spinneret with a hole diameter of 1.3 mm, and heated to 300°C under the spinneret. A cooling bath at 20° C. was introduced via a heat-retaining zone. At this time, the distance between the lower end of the heat retaining zone and the liquid surface of the cooling bath was 5 cm, and the draft magnification was 7.3 times. Then, after preheating/stretching in two stages so that the total draw ratio was 5.7 times, it was heat set at 155°C and a finishing oil was applied to obtain a monofilament with a diameter of 0.212 mm and a fineness of 651 dtex. . As shown in FIG. 1, this filament had a surface with deep textures in the fiber axis direction, and as shown in Table 1, had excellent binding strength and binding smoothness. In addition, the actual fishing evaluation results were extremely good, and the anglers highly rated the line, saying, "The line is flexible and easy to tie, and the line is resistant to twisting and has good durability."

(Example 2)
Melt spinning was carried out in the same manner as in Example 1, except that the amount of polymer discharged was reduced and the distance between the lower end of the heat retaining zone and the liquid surface of the cooling bath was changed to 3 cm to obtain a filament having grains on the fiber surface. As shown in Table 1, this filament had excellent binding strength and binding smoothness, and had an actual fishing performance equivalent to that of Example 1.

(Example 3)
Melt spinning was carried out in the same manner as in Example 1, except that a spinneret with a hole diameter of 2.0 mm was used and the amount of polymer discharged was increased to obtain a filament having grains on the fiber surface. As shown in Table 1, this filament had excellent binding strength and binding smoothness, and had an actual fishing performance equivalent to that of Example 1.

(Example 4)
Melt-spinning was performed in the same manner as in Example 1, except that a spinneret with a hole diameter of 3.0 mm was used and the polymer discharge rate was increased to obtain a filament having grains on the fiber surface. As shown in Table 1, this filament had excellent binding strength and binding smoothness, and had an actual fishing performance equivalent to that of Example 1.

(Example 5)
Spinning was carried out in the same manner as in Example 1, except that 0.05 wt % of silicon dioxide was added as a surface modifier. Compared with Example 1, this filament had large irregularities on the surface of the filament. As shown in Table 1, it had excellent binding strength and binding smoothness.

(Comparative example 1)
A monofilament was obtained in the same manner as in Example 1, except that the heat retaining area under the spinneret was removed and the distance between the spinneret surface and the liquid surface of the cooling bath was set to 20 cm. This filament had no wrinkles on the fiber surface and, as shown in Table 1, failed in both binding strength and binding smoothness. In addition, in the actual fishing evaluation, thread breakage occurred at the knot when a fish was hooked.

(Comparative example 2)
Spinning was carried out in the same manner as in Example 1, except that 1.0 wt % of silicon dioxide was added as a surface modifier. This filament had irregularities on the fiber surface, but as shown in Table 1, it failed in both binding strength and binding smoothness. In addition, in the actual fishing evaluation, thread breakage occurred sporadically at the knot when a fish was hooked.

1: Strength curve of Example 1 in binding smoothness evaluation 2: Strength curve of Comparative Example 1 in binding smoothness evaluation

Claims (3)

A monofilament containing a fluorocarbon resin as a main component, having a streak-like grain on the fiber surface along the fiber axis direction, and a ten-point average roughness RzJIS of the fiber surface of 0.10 μm or more and 2.00 μm or less. monofilament. 2. The monofilament according to claim 1, wherein the streaks forming crimps on the fiber surface have a surface roughness index Str representing an aspect ratio of 0.10 or less. Monofilament fishing line according to claim 1 or 2, wherein the fiber diameter is between 0.05 and 2.0 mm.

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