JPH05192061A - Fishing gear for longline fishing - Google Patents

Abstract

PURPOSE:To provide a fishing gear for longline fishing high in biting ratio of target fishes such as tuna to bait and excellent in durability and operability. CONSTITUTION:In the objective fishing gear for longline fishing having a fishhook base wire for connecting a hook 26 to branch line part 20, the hook base wire 11 is characterized by forming by together twisting plural steel wires having 200-400kgf/mm<2> tensile strength and plating these steel wires with zinc so as to attach the zinc to these steel wires in a plating amount of >=90g/m<2> and an amount not larger than the amount specified by the following formula: 190-(1/5).T (g/m<2>), wherein T is tensile strength (kgf/mm<2>) of the raw wire.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fishing line, and more particularly to a fishing tackle for longline fishing provided with a fishing wire used for tuna longline fishing.

[0002]

2. Description of the Related Art In tuna longline fishing, a buoy light is dropped from the stern from about 1 to 2 hours before sunrise, and while feeding the trunk rope in order, live fish such as saury, squid, and sardines are fed to the hooks of the branches. Alternatively, feed the simulated bait and throw it in the sea. The number of pots to be used depends on the size of the fishing boat, but the maximum number of pots to be used per day is about 550 to 600, generally 4
It will be about 100 to 500 bowls. The trunk rope is thrown with a certain amount of slack, but if one bowl is about 300 m long and about 20% of the slack is 450 bowls, the total length is 100 km or more.

In such a longline operation, it takes about 4 hours even if the rope is cast at a full speed of 10 to 12 knots. Until recently, most of the lanyards relied on manual work, but since the advent of automatic lanyards the work has been reduced. The main rope is unwound by an automatic lanyard, and in the process, it is laid at a predetermined trunk position, and floats are attached in order with special clips.

By the way, the portion of the branch rope to which the fishing hook is directly attached is called a fishing wire, and the biting condition of the tuna is considerably different depending on the selection of the material used for this fishing wire, which greatly affects the catch. It is known. Generally, the fishing wire is made of Tegsu or braid, but these have sufficient strength against the violent rotation of the tuna, and none of them are thin enough to be noticed by the tuna.

[0005]

[Problems to be Solved by the Invention] Under these circumstances,
It has been proposed to use steel wire as the fishing wire. The steel wire can further reduce the diameter of the fishing wire while satisfying the desired tensile strength. The use of a small diameter fishing wire makes it difficult for the tuna to be noticed and is lightweight, so that the movement of the bait is activated and it is expected that the tuna bites well.

However, since the fishing wire is used by immersing it in the sea, it will be corroded in a short period of time. Therefore, in order to use the fishing wire stably for a long period of time, it is necessary to apply corrosion-resistant plating to the steel wire with a sufficient thickness. However, if the plating layer is thickened, the life can be extended, but since the plating layer is brittle, fatigue resistance is reduced, and the fishing wire has a large diameter, so that the tuna biting rate is reduced.

Further, in the conventional fishing wire, if the tensile strength of the wire is increased, the fatigue resistance of the wire is lowered, and a brittle alloy layer is formed between the base metal and the plating, and the fatigue resistance is further increased. It lowers and breaks in a short time. Especially, in tuna longline fishing, which is operated daily for a long time,
Use stability is required.

The present invention has been made to solve the above problems, and it is an object of the present invention to provide a fishing tackle for longline fishing, which has a high biting rate with respect to the feed of target fish such as tuna and has excellent durability and operability. To aim.

[0009]

In the fishing tackle for longline fishing according to the present invention, the fishing wire for connecting the fishing hook to the branch rope has a wire tensile strength of 200 to 400 kgf / mm ² Of a plurality of steel wires are twisted, and these steel wires are galvanized, and the amount of zinc plating is 90 g or more per 1 square meter, and is defined by the following formula (1). It is characterized in that it is less than the amount. 190- (1/5) ・ T (g / m ² ) (1) where T is the wire tensile strength (kgf / mm ² ) Is shown.

The strength of the strand of the fishing wire is set to 200 to 400.
kgf / mm ² In order to improve the degree to a certain level, it is necessary to include at least 0.75% by weight or more of carbon in the steel wire. On the other hand, if the carbon content is too high, the fatigue resistance of the cable will deteriorate, so the upper limit of the carbon content may be set to 0.98% by weight in consideration of the influence of the plating treatment and the like. desirable. Furthermore, in the case of optionally adding chromium to strengthen the steel wire, for the same reason, the upper limit of the chromium content is preferably 0.4% by weight, and about 0.2% by weight. More preferable.

The lower limit of the zinc coating amount is 90 grams per square meter. If the coating amount is less than this, the plating thickness is likely to be non-uniform and rust is applied to the thin portion of the plating. This is because the corrosion resistance and durability are deteriorated.

On the other hand, the upper limit of the zinc coating amount is defined by the above formula (1) because the plating layer is brittle, and if the coating amount exceeds this value, the wire or wire twisted wire may be repeatedly bent or vibrated. This is because a fatigue crack occurs in the intermetallic compound layer near the interface and the wire breaks in a short time.

The reason why zinc plating is formed by a so-called "one-bath method" in which a single molten metal bath is used to dip and pass inner strands or wires constituting the inner strands is to improve the surface characteristics of the plating. .. Since the intermetallic compound at the boundary between the wire base metal and the plating layer is hard and brittle, if this intermetallic compound layer grows and develops to a thickness that cannot be ignored, this will become the starting point of fatigue cracking and cause This is because the fatigue resistance of the wire is significantly reduced. Further, the plating formed by the one-bath method has less uneven thickness and has a smooth surface, so that it is excellent in operability and has improved corrosion resistance and fatigue resistance. Further, by controlling the cooling conditions immediately after plating to a desired speed and temperature, the plating layer can have a uniform and smooth plating surface without uneven thickness.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Various embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 2, trunk ropes 30 are successively cast from the longline fishing boat 70.

The trunk line 30 forms the main part of a long line and has a total length of 100 km or more. Floating ropes 40 are attached to the trunk ropes 30 at substantially equal intervals by clips (not shown).
0 does not sink to the sea floor. Each float 40
A float 51 and a flag pole 60 are attached to the upper ends of the main ropes 30, and a desired buoyancy is applied to the trunk rope 30 through the plurality of float ropes 40. It should be noted that the buoy lamps 50 are provided together with the floats 51 at appropriate intervals so that they can be seen even at night.

As the floating rope 40, a rope having substantially the same thickness as the trunk rope 30 is used, but since it does not receive a strong force unlike the trunk rope 30, the floating rope 40 may have a slightly smaller diameter. Incidentally, the length of the floating rope 40 is about 40 m.

A large number of branch rope portions 20 are suspended from the trunk rope 30. The mutual distance between the branch rope portions 20 is about 50.
m. Fishing hooks 26 are attached to the lower ends of the branch rope portions 20, and baits are attached to the fishing hooks 26. Here, the space between the floating rope 40 and the next floating rope 40 is called one pot. As shown in FIG. 3, in the case of tuna longline fishing, the lengths of the branch lines 20 provided in one bowl are almost the same. Next, the branch rope portion 20 will be described with reference to FIG.

The branch rope portion 20 is roughly composed of three portions. That is, the upper branch rope 22, the Sekiyama 24, and the fishing wire 11 are bound in order from the trunk rope binding portion 31. The branch rope portion 20 has the fishing hook 26 attached to the fishing wire 11 at the lower end, and thus serves as a line thread in the case of a fishing rod. In particular, fishermen use nerves for the fishing wire 11 because the material and the condition of the fishing wire 11 affect the feeding of the tuna.

The length of the upper branch rope 22 differs depending on the swimming layer in which the target fish inhabits, but in the case of tuna fishing, it is 15 to 20.
It is about m. Sekiyama 24 following the upper branch rope 22 is 9
It is a wire in which No. 26 to No. 29 wires are twisted and wound with a silk thread or a thread having a thickness of vinylon 210D, and is connected to a branch line 22 by a "pot", and the lower end thereof is also the fishing wire 11 Connected to.

As shown in FIG. 4, the upper branch rope 22 is bound to the trunk rope 30 by the binding portion 31. As shown in FIG. 5, the Sekiyama 24 is connected to the upper branch rope 22 by a salcan 23. The sulcan 23 has a more reversing role. As shown in FIG. 6, the fishing wire 11 is joined to the Sekiyama 24 by the joining portion 25. As shown in FIG. 7, a fishing hook 26 is attached to the lower end of the fishing wire 11. The fishing wire 11 is formed by twisting seven wires of Nos. 25 to 30 and has a length of about 2 m. Fishhook 2
6 has a size of 105 to 115 mm. As shown in FIG. 8, the flagpole 60 has a floating rope 40, two floats 51,
A red and white flag 61 and a weight 62 are tied together. Next, a case of manufacturing the fishing wire 11 will be described. [Heat treatment of steel wire]

The carbon content is 0.62% by weight,
0.75% by weight, 0.86% by weight, 0.92% by weight,
Three kinds of 1.42 mm diameter piano wire made by adding 0.90% by weight of chromium to 0.28% by weight of hyper-eutectoid steel was heated in the austenite region and then passed through the A ₁ transformation point from the maximum heating temperature. The structure of each wire is transformed from austenite to pearlite by accelerating cooling at such a rate that the time until the heating becomes 0.8 seconds or less.

In this heat treatment step, care must be taken so that initial cementite is not generated and the structure is not coarsened. This is because if coarse cementite precipitates, subsequent wire drawing becomes difficult and the fatigue resistance of the wire decreases. [Steel wire plating]

The steel wire plating process will be described with reference to FIG. The steel wire 11a heat-treated as described above is dipped and passed in a molten lead bath (not shown) (about 450 ° C.), and is further dipped and passed in a water cooling tank, a hydrochloric acid tank, and a water washing tank (neither is shown) to degrease the surface. Wash. After the degreasing cleaning treatment, a predetermined amount of flux is attached to the steel wire 11a in the flux tank 2 and dried in the hot air drying furnace 3. After drying, steel wire 1
1a is passed through the plating bath 4 by immersion. The plating bath 4 contains molten zinc.

A roll box 5 is provided at a position where the steel wire 11a is transferred from horizontal to vertical by a roll 5 in the bath and the steel wire 11a is pulled up from the bath 4. A non-oxidizing gas 7 is introduced into the seal box 6 to squeeze out excess zinc adhering to the steel wire 11a in a non-oxidizing atmosphere to adjust the plating layer to an appropriate thickness. Further, water is sprayed onto the steel wire 11a by the water cooling nozzle 8 to water-cool the steel wire 11a. The temperature of the cooling water is adjusted to 45 ± 2 ° C., and the steel wire 11a is cooled at a desired cooling rate. The amount of zinc plating applied is 80 to 1 per square meter of wire surface area.
Various samples shown in Table 1 were prepared by changing the range of 60 grams. [Drawing]

After the plating treatment, the steel wire 11a is reduced in area by 96.
Wire drawing was performed at 5%. At this time, it is necessary to reduce the surface tensile residual stress of the wire generated during wire drawing for the purpose of ensuring the workability for obtaining the desired strength. That is, in the middle of wire drawing, the steel wire 11a is passed through a so-called leveling roll in which a plurality of small-diameter rollers are arranged in a zigzag manner, and a small bending strain is applied to the steel wire 11a to improve the twisting value. As in this example, since the surface properties of the plating formed by the one-bath method are good, the effect of wire drawing on the fatigue resistance is not recognized. [Twisted] Plating coverage is 1m ² A case of manufacturing the wire 11 by twisting together about 100 grams of the steel wire 11a will be described.

Steel wire 11 from seven bobbins of the tubular stranded wire machine
The rotor was rotated while supplying a toward each voice, and 1 × 7 wire ropes 11 having a cross section as shown in FIG. 10 were manufactured. The twist pitch at this time was 28 to 30 mm.

As shown in Table 1, the wire ropes of Examples 1 to 5 and Comparative Examples 1 to 20 were manufactured through the above steps. In addition, here, the wire rope 11 is set to 1 ×.
Seven strands are used, but the number is not limited to this, and 3 × in FIG.
7-strand rope, 1 × (3 + 9) -strand rope in FIG.
Alternatively, a 4 × 3 twist rope of FIG. 13 may be used. next,
The fatigue test of the rope 11 will be described with reference to FIG. [Durability test]

One end of the sample rope 11 is fixed to the member 81 of the fatigue tester, and the weight 82 is hung from the other end through the support roll 83, and a set of three rolls 80 is provided. Thus, tensile and compressive bending stress was repeatedly applied to the sample rope 11. The diameter of each roll 80 is 1 inch, and three rolls 80 are simultaneously reciprocated in the horizontal direction. The weight of the weight 82 corresponds to 10% of the breaking load of the rope 11.

In this case, the test condition is a stroke amount of 2
A reciprocating vibration of 5 mm was applied to the rope 11 about 80,000 times.
The acceptance / rejection of the durability test was determined by the presence / absence of wire breakage. As shown in Table 1, Examples 1 to 1
All 5 test results were good. On the other hand, the results of Comparative Examples 2, 3, 5, 6, 8 to 10 and 15 were poor. [Corrosion resistance test]

A salt spray test was conducted to evaluate the corrosion resistance of each sample rope. Salt water was sprayed onto the rope at room temperature, and the time until red rust was generated on the surface was examined. Those with a red rust generation time of more than 200 hours are regarded as acceptable.

As shown in Table 1, all the test results of Examples 1 to 5 were excellent because the red rust generation time exceeded 200 hours. On the other hand, Comparative Examples 1, 7, 11,
The 16 results were clearly inferior to this. Comparative Example 1
In Nos. 2 and 17, the result of the occurrence of red rust for 220 hours was good.

The cold drawing (drawing) process and the plating process of the rope may be replaced with each other.
That is, in the above embodiment, the case where the wire drawing process is performed after the plating process has been described, but the plating process may be performed after the wire drawing process.

In the above embodiment, an example of tuna longline fishing was explained, but the present invention is not limited to this.
As shown in FIG. 15, the fishing wire 11 may be adopted as a dragonfly rope having branch rope portions 20 having different lengths in one pot. Further, as shown in FIG. 16, the present invention can also be applied to a bluefin tuna rope having only one branch rope 20 in one pot.

[0034]

[Table 1]

[0035]

According to the present invention, it is possible to provide a fishing gear which is excellent in durability and operability and has high tensile strength and light weight. Especially, if the cooling rate is controlled during the wire plating process, the uneven thickness is small, the surface is smooth, and the growth and development of the intermetallic compound layer at the boundary between the wire base metal and the plating layer is small,
It is possible to obtain a plating structure with excellent fatigue resistance. For this reason, it is possible to obtain a fishing gear that is compact and light, and that has a fishing wire that is hard to break. Further, by increasing the tensile strength of the strand, the strand diameter can be reduced, the amount of zinc deposited can be increased, and the corrosion resistance can be improved. Furthermore, in the fishing gear of the present invention, the diameter of the fishing wire can be reduced by about 20% as compared with the conventional Tegusu product, so that the biting rate of tuna is significantly improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a mechanism of a fishing gear according to an embodiment of the present invention.

[Figure 2] Schematic diagram of tuna longline fishing.

FIG. 3 is a view showing the mechanism of one longline between the float and the float.

FIG. 4 is an enlarged view of a portion where a branch rope is connected to a trunk rope.

FIG. 5 is an enlarged view showing a connecting portion between the twisting (sarkan) and Sekiyama.

FIG. 6 is an enlarged view showing a connecting portion between Sekiyama and a fishing wire.

FIG. 7 is an enlarged view showing a fishing hook connected to a fishing wire.

FIG. 8 is an enlarged view showing a flagpole.

FIG. 9 is a schematic configuration diagram showing a part of a plating apparatus.

FIG. 10 is a cross-sectional view of the fishing wire according to the embodiment of the present invention.

FIG. 11 is a transverse cross-sectional view of a fishing wire according to another embodiment.

FIG. 12 is a cross-sectional view of a fishing wire according to another embodiment.

FIG. 13 is a cross-sectional view of a fishing wire according to another embodiment.

FIG. 14 is a schematic configuration diagram showing a part of a fatigue resistance test apparatus.

FIG. 15 is a schematic view of a dragonfly rope.

FIG. 16 is a schematic diagram of a bluefin tuna rope.

[Explanation of Codes] 11: Fishing wire, 20: Branch line, 21, 25; Coupling part, 22: Upper branch line, 23; Twisted sulcan,
24; Sekiyama, 26; Fishing hook, 30; Trunk line, 31; Snap, 40; Float, 50; Buoy light, 51; Float, 60;
Flagpole

Claims (1)

[Claims] 1. A fishing tackle for longline fishing, comprising a fishing wire for connecting a fishing hook to a branch line portion, wherein the fishing wire has a wire tensile strength of 200 to 400 kgf / mm ^2. Are formed by twisting a plurality of steel wires, and these steel wires are galvanized, and the galvanized amount is 90 g or more per 1 square meter and is less than the amount specified by the following formula. Fishing equipment for longline fishing, characterized in that 190- (1/5) ・ T (g / m ² ) However, T is the wire tensile strength (kgf / mm ² ) Is shown.