JPH1052199A - Leader for fly fishing and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject leader excellent in knot strength, tensile strength and natural drift properties without causing melt fracture by using a vinylidene fluoride resin having a fixed viscosity so as to constitute a butt part, a tapered part and a tappet part. SOLUTION: After a tapered part 3 connected to a butt part 2 having 800-1,800μm yarn diameter is formed, as a condition to form a tappet part 4 having 280-1, 100μm yarn diameter, the delivered amount of the butt part 2 is 1. 0-3. 5 cc/minute, the take-off speed is 1-3m/minute, the delivered amount of the tappet part 4 is 0.5-3.0cc/minute, the take-off speed is 3-10m/minute, the delivered amount of the butt part 2 is reduced by 20-90% in 0.5-3 seconds, the take-off speed is increased by 100-1,000% to give a tapered yarn. The yarn is drawn in a bath having 150-300 deg.C drawing temperature in 4.0-7.0 times draw ratio to give the objective leader for fly fishing composed of a vinylidene fluoride resin having 1.0-1.7dl/g inherent viscosity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fly fishing reader and a method for manufacturing the same. More specifically, the present invention is a fly fishing leader composed of a bat part, a tapered part, and a tippet part, and has a high tensile strength by being made of a vinylidene fluoride resin having a specific viscosity range. For the fly fishing with excellent natural drift properties, it has been improved so that the shape-unstable portion (constriction) smaller than the average thread diameter of the tippet portion and melt fracture do not occur at the junction from the tapered portion to the tippet portion. The present invention relates to a leader and a manufacturing method thereof.

[0002]

2. Description of the Related Art Fly fishing is a method in which a fly is cast from a distant place where the fish is unaware of it, without attaching a weight or a broom, and the fly is drifted to the surface of the water or underwater to catch the fish. In order to respond to such a demand for fly fishing, fly fishing uses five parts: a fly rod, a reel, a fly line, a leader and a fly.

[0003] Among them, it is preferable for the leader to reduce the yarn diameter in order to drift naturally,
In order to drop the fly gently onto the surface of the water, the leader needs to have a tapered portion for smoothly transmitting the inertial force from the fly line during casting. For this reason, the leader is usually composed of a portion called a bat having a large thread diameter connected to the fly line, a portion called a taper having a tapered shape, and a portion called a tippet having a small thread diameter for attaching the fly. Note that, in FIG. 1, (a) is an explanatory diagram of the above-mentioned leader, and in the figure, reference numeral (1) denotes a leader, (2)
Is the butt part (A), (3) is the tapered part (B), (4)
Represents a tippet portion (C).

[0004] Then, it is preferable that the leader use a material having a refractive index close to that of water so as not to notice the fish. As a material having a refractive index close to that of water, there is a vinylidene fluoride resin. However, when spinning using a vinylidene fluoride resin, it is difficult to obtain a smooth shape.
In particular, in the manufacture of tapered leaders,
At the connecting portion (5) from the tapered portion (B) to the tippet portion (C), an unstable portion (constriction) (6) smaller in shape than the average diameter of the tippet portion is generated. As a result, stress concentrates on the constriction, causing yarn breakage.

Further, when spinning is performed using a vinylidene fluoride resin, melt fracture is liable to occur. This is particularly noticeable in the manufacture of a leader having a taper. That is, since the leader having the taper is composed of the butt portion (A), the taper portion (B), and the tippet portion (C), it is necessary to change the yarn diameter according to each portion in the manufacturing process. Melt fracture is likely to occur. If the original yarn in which melt fracture is generated is drawn for strength development, yarn breakage is likely to occur, and the appearance of the surface deteriorates. Further, a leader obtained by using a vinylidene fluoride resin having a specific inherent viscosity or less has a poor natural drift property.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to have a high tensile strength and to connect a tapered portion (B) to a tippet portion (C). The part (5) is improved so that the shape unstable part (neck) smaller than the average yarn diameter of the tippet part (constriction) (6) and melt fracture do not occur, and has excellent natural drift properties.
An object of the present invention is to provide a fly fishing reader made of a vinylidene fluoride resin having a good appearance.

[0007]

That is, the first aspect of the present invention is as follows.
The gist of the present invention is a fly fishing leader comprising a vinylidene fluoride resin, a bat portion, a taper portion, and a tippet portion, wherein the vinylidene fluoride resin has an inherent viscosity of 1.0 to 1. A second aspect of the present invention resides in a fly fishing leader characterized in that the fly is made of a vinylidene fluoride resin and comprises a bat, a taper, and a tippet. In the method of manufacturing a leader for fishing, there is provided a method of manufacturing a leader for fly fishing, wherein a vinylidene fluoride resin having an inherent viscosity of 1.0 to 1.7 dl / g is used.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The fly fishing leader (hereinafter abbreviated as a leader) in the present invention is a so-called knotless taper leader which is made of a vinylidene fluoride resin-based monofilament and has no knot. Examples of the vinylidene fluoride resin as a raw material include a vinylidene fluoride homopolymer, a vinylidene fluoride copolymer, and a mixture thereof.

The vinylidene fluoride copolymer must be selected from a range in which the bulkiness and strength are acceptable as a knotless taper leader. Examples of the vinylidene fluoride-based copolymer satisfying such conditions include a copolymer composed of ethylene tetrafluoride, propylene hexafluoride, ethylene trifluoride, ethylene trifluoride chloride, vinyl fluoride, and the like. One or more of the above monomers can be used.

The inherent viscosity of the vinylidene fluoride resin constituting the leader is 1.0 to 1.7 dl.
/ G, preferably 1.10 to 1.35 dl / g, more preferably 1.15 to 1.35 dl / g, and particularly preferably 1.10 dl / g.
It needs to be in the range of 20 to 1.35 dl / g.
If the inherent viscosity is less than 1.0 dl / g, a high tensile strength cannot be obtained, and it is difficult to control the length during production, and the tapered portion becomes long. Usually, since the fly fishing leader is sold and used with a fixed length, if the tapered portion becomes longer, the butt portion and the tippet portion cannot be made longer. Such a leader is not preferable because it cannot maintain the natural drift property and cannot attack points more accurately.

By the way, it is considered that the tapered portion can be shortened by shortening the variable time of the extrusion amount and the take-up speed of the vinylidene fluoride resin. However, usually, the variable time is about 1 second, and if the variable time is shorter than 1 second, it takes time to stabilize the extrusion amount and the take-off speed, and the yarn unevenness in the butt portion and the tippet portion is reduced. It is easy to occur.

When the inherent viscosity exceeds 1.7 dl / g, the shape of the tapered portion (B) from the tapered portion (B) to the tip portion (C) is unstable at a joining portion (5) smaller than the average yarn diameter of the tippet portion. The portion (constriction) (6) is apt to occur, and stress is concentrated when the fish is caught, causing a thread break. In addition, melt fracture occurs, and when stretched, yarn breakage is likely to occur, and the surface appearance is poor.

A plasticizer, a heat stabilizer, an acrylic resin, a crystal nucleating agent, a lubricant and the like can be added to the vinylidene fluoride resin. In particular, in order to smoothly cast the leader and drop the fly accurately at the target position, it is necessary to easily remove the curl of the yarn. For this purpose, it is necessary to add a plasticizer in an amount of 1 to 10% by weight. preferable.

Examples of the plasticizer added to the vinylidene fluoride resin include an aliphatic polyester. For example, an aliphatic dialcohol having 2 to 4 carbon atoms and 2 to 6 carbon atoms
An aliphatic polyester composed of an aliphatic dicarboxylic acid ester and an aliphatic polyester composed of a 3- to 7-membered cyclic ester are preferred. Examples of the aliphatic dialcohol having 2 to 4 carbon atoms include ethylene glycol, propylene glycol, 1,4-butanediol, and 1,2-butanediol.

Examples of the aliphatic dicarboxylic acid having 2 to 6 carbon atoms include oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid and the like. Also, 3 ~
Examples of the 7-membered cyclic ester include β-propiolactone, γ-butyrolactone, δ-valerolactone, ε-caprolactone, and the like.

[0016] A plasticizer is added to the vinylidene fluoride resin and mixed by a ribbon blender, a high-speed mixer (Henschel mixer), a fixed V-type blender, a tumbler, a ball mill, and the like. , It is preferable to use a composition obtained by a method of melt-kneading with an extruder.

The melt spinning temperature can be any temperature within the range from the melting point of the vinylidene fluoride resin to the thermal decomposition, but in order to maintain stable spinnability, it is usually 200.
To 300 ° C, preferably 230 to 280 ° C.

The discharge amount of the vinylidene fluoride resin extruded from the spinning nozzle of the extruder and the take-up speed of the raw yarn are adjusted according to the yarn diameter and length of the bat, taper and tippet.

For example, after forming a tapered portion following a bat portion having an original yarn diameter of 800 to 1800 μm, a yarn diameter of 280
When forming a tippet portion of ~ 1100 µm, the discharge amount of the butt portion is 1.0 ~ 3.5 cc / min, and the take-off speed is 1 ~
3m / min, discharge volume of tippet part is 0.5-3.0cc
/ Min, take-off speed is 3-10m / min, and
By changing the rotation speed of the gear pump and the peripheral speed of the pinch roll, the discharge amount of the butt portion is reduced by 10 to 90% in 0.5 to 3 seconds, and the take-up speed is set to 100 to 1000.
%increase.

In the process of changing the discharge amount and the take-up speed (process of 0.5 to 3 seconds), a tapered portion is formed, and a tippet portion is formed. Next, when the tippet portion, the tapered portion, and the butt portion are formed in this order, the above-described process of changing the discharge amount and the take-up speed may be performed in the same manner.

In the production of the raw yarn, the distance between the spinning nozzle and the cooling bath (air gap) is usually 20 to 300 mm,
Preferably, it is set in the range of 30 to 250 mm.

The molten vinylidene fluoride resin that has passed through the air gap is cooled in a cooling bath and solidified. Examples of the coolant of the cooling bath used here include water, water containing an inorganic salt, alcohols, polyethylene glycol, glycerin, and a mixed system thereof. The cooling temperature is preferably not higher than the temperature at which bubbles due to boiling are not generated at the interface with the molten resin. For example, when the refrigerant is water, the cooling temperature is usually 20 to 50 ° C.
Preferably, the temperature is 30 to 45 ° C.

The tapered raw yarn made of the vinylidene fluoride resin is drawn in a bath at a drawing temperature of 150 to 300 ° C. Examples of the heat medium used in the stretching bath include liquid heat medium such as boiling water and glycerin, and gaseous heat medium such as air, water vapor and nitrogen gas, and glycerin is particularly preferable. The stretching temperature when a liquid heating medium is used is preferably from 150 to 180 ° C. In particular, for glycerin, the stretching temperature is more preferably from 160 to 175 ° C, and most preferably from 165 to 172 ° C. The stretching temperature when using a gaseous heat medium is 200 to 250 ° C.
Is preferred.

The drawing of the tapered yarn is performed in one step or two steps.
The stretching can be performed in multiple stages or more, but from the viewpoint of improving strength, the total stretching ratio is usually 4.0 to 7.0 times, preferably 4.5 to 6.5 times, and more preferably 4.8. ~ 6.3
It is twice.

After the stretching, a relaxation heat treatment may be further performed. The relaxation heat treatment temperature is usually 70 to 180 ° C., and the relaxation rate is usually 2 to 10%. In addition, when used while floating on the water surface, a water repellent or an oiling agent may be applied to the surface of the reader obtained by the above method.

The yarn diameter of each part of the leader is usually as follows. The yarn diameter of the bat is usually 300 to 800 μm
The thread diameter of the tippet portion is usually 50 to 600 μm. A leader in which the thread diameter ratio of the tippet portion to the thread diameter of the butt portion is 0.1 to 0.7 is generally used.

The leader made of the vinylidene fluoride resin and the method for producing the same according to the present invention have an inherent viscosity of 1.0 to 1.7 dl / g, have a high tensile strength, and have a tapered portion. Provided is a leader having excellent natural drift properties, a good appearance, and a method of manufacturing a leader, which does not generate an unstable portion (constriction) thinner than the average thread diameter of the tippet portion and melt fracture at the joint portion to the pet portion, and has excellent natural drift properties. I can do it.

[0028]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist. The evaluation method is as follows.

(1) Yarn diameter: A yarn diameter change was measured using an outer diameter measuring device (manufactured by KEYENCE CORPORATION, laser outer diameter measuring device "L-3100") at a yarn running speed of 2 m / min. . In the above yarn diameter measurement results, the average value of the maximum yarn diameter and the minimum yarn diameter of the tippet portion or the average value of the maximum yarn diameter and the minimum yarn diameter of the butt portion was defined as the average yarn diameter of the tippet portion and the butt portion.

(2) Strength and strength test: Tensile tester (Tensilon UTM-III-10 manufactured by Orientec Co., Ltd.)
No. 0 "), the nodule strength of 10 samples was measured for the tippet portion of the reader under the conditions of a test length of 30 cm, a temperature of 23 ° C., and a tensile speed of 300 mm / min.
The knot strength was obtained by dividing the knot strength by the average yarn diameter cross-sectional area of the tippet portion. The tensile strength of the leader was measured under the same conditions as described above.

(3) Inherent viscosity: Measured at a concentration of 0.4 g / dl and a temperature of 30 ° C. using dimethylacetamide as a solvent.

(4) Presence / absence of constriction: Judgment was made based on a change in the yarn diameter measured by the above outer diameter measuring device.

(5) Presence or absence of melt fracture: magnification 4
Judgment was made by observing the original yarn diameter with a microscope of 0 magnification.

(6) Natural drift property: A fly fishing rod with a reel, a fly line, and a reel set with a leader, a fly line, and a fly obtained in the embodiment was used by 10 people with more than 5 years of fly fishing experience, and the fly was natural. Judged whether the drift could be sustained and the points could be attacked accurately. The natural drift property was evaluated based on three criteria shown in Table 1 below, and the average was obtained.

[0035]

[Table 1] ：: Natural drift duration and points can be accurately attacked. Δ: It is somewhat difficult to sustain natural drift and accurately attack points. X: It is extremely difficult to accurately maintain the natural drift and to accurately score points.

Examples 1 to 4, Comparative Examples 1 and 2, 100 parts by weight of a vinylidene fluoride resin having an inherent viscosity shown in Table 2 and a polyester plasticizer (aliphatic diol 2 of propylene glycol and butanediol)
5 parts by weight of a seed and an aliphatic dicarboxylic acid of adipic acid) were mixed with a Henschel mixer and pelletized using an extruder having a diameter of 35 mm.

A nozzle having a temperature of 280 ° C. and a diameter of 1.3 mm and having 6 holes has a discharge amount A shown in Table 2 per hole.
The pellets were extruded at cc / min, passed through a cooling bath at a temperature of 43 ° C., and pulled with a pinch roll having a take-off speed of Am / min.
The raw yarn (bat part) was pulled for a second. Next, the discharge rate Bcc / min and the take-up speed Bm / min shown in Table 2 were changed in 1 second and set for 30 seconds (tippet section). 1
For 15 seconds and left (bat part) for 15 seconds. These steps were performed periodically to obtain a tapered raw yarn.

The obtained tapered yarn is heated at a temperature of 169 ° C.
In a glycerin bath of 5.6 times. Further, after a 3% relaxation treatment with hot water of 80 ° C., the bat portion and the tippet portion were cut so that the length of each was 1 m, thereby obtaining a leader. Table 2 shows the spinning conditions and the physical properties of the leader.

Here, in Comparative Example 2, the presence or absence of constriction and the observation of melt fracture were performed on the original yarn because the original yarn was broken during stretching. Inherent viscosity of 1.0 dl /
If it is less than g, the knot strength and tensile strength are low, the length of the tapered portion is long, and it is extremely difficult to maintain natural drift properties and accurately attack points (Comparative Example 1). If the inherent viscosity exceeds 1.7 dl / g, breakage occurs during stretching (Comparative Example 2).

[0040]

[Table 2]

[0041]

As is apparent from the above description, according to the present invention, a leader made of a vinylidene fluoride resin having an inherent viscosity of 1.0 to 1.7 dl / g can be obtained from a tapered portion through a tippet. As a leader, it has excellent natural drift properties, high knot strength and high tensile strength, with no unstable parts (constriction) thinner than the average thread diameter of the tippet part and melt fracture at the joint part. Useful.

[Brief description of the drawings]

1 (a) is an explanatory view of a leader, and FIG. 1 (b) is an enlarged view of a connecting portion (5) of the reader (1) shown in FIG. 1 (a).

[Description of symbols] 1: Leader 2: Bat part (A) 3: Tapered part (B) 4: Tippet part (C) 5: Coupling part from tapered part to tippet part 6: Constriction

Claims (7)

[Claims] 1. A fly fishing leader comprising a vinylidene fluoride resin and comprising a butt portion, a taper portion, and a tippet portion, wherein the vinylidene fluoride resin has an inherent viscosity of 1.0 to 1.0. A fly fishing reader characterized by a weight of 1.7 dl / g. 2. An inherent viscosity of 1.10 to 1.35.
2. The fly fishing reader according to claim 1, wherein the ratio is dl / g. 3. An inherent viscosity of 1.15 to 1.35.
The fly fishing reader according to claim 1 or 2, wherein the weight ratio is dl / g. 4. A method for manufacturing a fly fishing reader comprising a vinylidene fluoride resin and comprising a bat portion, a taper portion, and a tippet portion, wherein the inherent viscosity is 1.0 to 1.7 dl / g. A method for manufacturing a fly fishing leader, comprising using a vinylidene fluoride resin. 5. A method for manufacturing a fly fishing leader made of a vinylidene fluoride resin and comprising a bat portion, a tapered portion, and a tippet portion, wherein the raw yarn diameter is 8 mm.
As a condition for forming a tapered portion following a butt portion of 00 to 1800 μm and then forming a tippet portion having an original yarn diameter of 280 to 1100 μm, the discharge amount of the butt portion is 1.0 to 1.0 μm.
3.5 cc / min, take-up speed is 1-3 m / min, discharge volume of tippet is 0.5-3.0 cc / min, take-up speed is 3
10 m / min, the discharge amount of the bat portion is reduced by 20 to 90% in 0.5 to 3 seconds, and the take-up speed is set to 100 to 100
5. The method for manufacturing a fly fishing leader according to claim 4, wherein after increasing the tapered yarn by 0%, the yarn is drawn 4.0 to 7.0 times in a bath at a drawing temperature of 150 to 300 ° C. . 6. An inherent viscosity of 1.10 to 1.35.
The method for producing a fly fishing leader according to claim 4 or 5, wherein the flow rate is dl / g. 7. An inherent viscosity of 1.15 to 1.35.
The method for producing a fly fishing leader according to any one of claims 4 to 6, wherein the dl / g is dl / g.