JPH0383531A - Side stretching rope for fishing net - Google Patents

Abstract

PURPOSE:To obtain the subject rope having a remarkably light weight as compared with that of a compound rope using conventional tension members made of steel wires by providing low tension members of fiber-reinforced protrusion rods between a core layer and an outer layer of each side strand constructing the compound rope and forming an interlayer. CONSTITUTION:The aforementioned side tension rope has an interlayer 4 of each side strand 2 formed from tension members 6 composed of fiber-reinforced protrusion rods (4a) having a low elongation. A core layer 3 is formed from ordinary synthetic fiber filament having a high elongation and the interlayer 4 around the core layer 3 is more tensed than the core layer 3 with the twisting of the side strand 2. Thereby, when a tension is applied to the side strand 2, a load is applied to the rods (4a). As a result, the ordinary synthetic fiber filament will not be broken earlier than the rods (4a). The tension members 6 form the interlayer 4, which is covered with an outer layer 5. Thereby, the tension members are protected and tenacity thereof can be exhibited to the maximum. The aforementioned side stretching rope for fishing nets is lighter than conventional ropes and operating efficiency in production, storage and transportation is excellent with good longevity.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a side robe used for large nets such as fixed nets and live nets.

(Prior technology) Hemp robes and synthetic fiber ropes have traditionally been used as side ropes for large nets used in coastal fishing, such as fixed nets and live nets. Fishing boats are now moored to ropes for tasks such as baiting, so in order to stabilize the fishing boats, a synthetic fiber strand is placed in the core of the rope, and a synthetic fiber strand is placed around the core of the rope, and a synthetic fiber that covers the outer surface of the rope. Compound lobes with high strength, low elongation, and high stiffness that have multiple side strands made of fibers have come into use.

(Problem to be Solved by the Invention) However, in a compound lobe using steel wire strands, the steel wire occupies 30 to 40% of the total volume, and the specific gravity of this steel wire is significantly larger than that of synthetic fibers. The weight of the side rope becomes excessive, and especially when the size of the side rope is increased as fishing gear becomes larger, the side rope becomes even heavier and has extremely increased rigidity. The workability of storage and transportation was significantly reduced. Another drawback was that the steel wire rusted when exposed to seawater, resulting in a short service life.

This invention has the same strength, elongation, and rigidity as a compound rope with steel wire strands, and is significantly lighter than that rope, making it easy to manufacture, store, and transport, and has a long life. This provides a rope for side tensioning.

(Means for Solving the Problems) In order to solve the above problems, the lateral lobes of the present invention have a plurality of side lobes surrounding a core strand made of a large number of ordinary synthetic fibers with relatively high elongation. The strands are arranged and heated, and this side strand consists of a core layer, an intermediate layer and an outer layer, the core layer and the outer layer are formed of ordinary synthetic fiber filaments of relatively high elongation, and the intermediate layer is formed of a relatively low elongation. It is made of a tensile body made by twisting together a large number of fiber-reinforced pultrusion rods with a diameter of 0.9 to 3.0 m, which are made of reinforcing fibers of ultra-high strength polyethylene filaments and matrix resin.

The ultra-high strength polyethylene filament used in this invention has a specific gravity of 0.98 or less, a tensile strength of 20 g/denier or more, preferably 30 g/denier or more, and a Young's modulus of 5.
00 g/denier or more, preferably ioo・Og/
The material has a denier or more and a breaking elongation of 2.0 to 5.0%, preferably 3.0 to 4.5%.

The fiber-reinforced pultrusion rod using the above-mentioned ultra-high-strength polyethylene filament as a reinforcing fiber is manufactured by a pultrusion method using thermosetting resin as a matrix resin in -M, but is not limited thereto. As the matrix resin, -m is an unsaturated polyester resin,
Any one of vinyl ester resins, epoxy resins and urethane acrylate resins may be used alone or in combination of two or more.

The fiber-reinforced pultrusion rod described above may be used as is, or may be coated with polyethylene or nylon 12 by melt extrusion for the purpose of improving wear resistance and crush resistance. In this case, the coating thickness is preferably 0.1 to 0.5 m depending on the diameter of the rod. If the coating thickness is less than 0.1 leap, the coating effect will be small and coating will be difficult. On the other hand, even if it exceeds 0.5B, the effect will not increase as much as the thickness increases.

In the above-mentioned fiber reinforced pultrusion rod, the volume occupied by the ultra-high strength polyethylene filament, that is, the fiber volume content is preferably 50 to 75%, particularly 60 to 70%. If this fiber volume content is less than 50%, The tensile strength becomes low, and if you try to obtain a rope with a predetermined strength, the thickness will become too large. On the other hand, if it exceeds 75%, buckling is likely to occur and handling becomes difficult.

On the other hand, ordinary synthetic ll1m with relatively high elongation is made of Heiiso fiber, which has a higher elongation at break compared to the above-mentioned ultra-high strength polyethylene filament, e.g. tensile strength 4.5 g/denier, elongation at break 25~ 40% nylon filament,
Tensile strength 4.5~6.0g/denier, elongation at break 15~
25% polyester filament, tensile strength 4.5~
These include polypropylene filaments of 7.5 g/denier and a breaking elongation of 15 to 25%, and slit yarns of these synthetic resin films.

The preferred content of the fiber-reinforced pultrusion rod in the total amount of the rope is 30 to 60% by weight.

FIG. 1 is a schematic cross-sectional view of the side rope of the present invention, in which the core strand l is obtained by further twisting and heating the required number of twisted yarns la of a large number of the above-mentioned ordinary synthetic fiber filaments, Its outer diameter is preferably 15 to 2601111,
Then, the side strands 2 are placed around the core strand 1,
Preferably, 3 to 10 lobes are arranged and heated to obtain lateral lobes.

The above-mentioned side strand 2 is composed of a core layer 3, an intermediate layer 4 and an outer layer N5. As shown in FIG. 2, the core layer 3 is formed to have a diameter of 4.0 to 7.2 fi by aligning, twisting, or braiding the above-mentioned ordinary fiber filaments 3a. The intermediate layer 4 is made by aligning, twisting, or braiding ordinary synthetic fiber filaments and has a diameter of 1.4 to
2.4 core yarns 6a with a diameter of 0.9 to 3.0 reinforced with the above-mentioned ultra-high strength polyethylene filament.
m fiber-reinforced pultrusion rod 4a from 3 to lO
This tensile body 6 is arranged and heated to form a tensile body 6.
It is formed by arranging ten pieces around the core N3. The outer layer 5 is formed by arranging a large number of ordinary synthetic fiber filaments 5a outside the intermediate layer 4 and heating them to preferably have an outer diameter of 10 to 17 m. Note that the lead of the tensile body 6 (pitch of the coil formed by heating/diameter of the tensile body) and the lead of the intermediate layer 4 are set to 8 to I2 in order to increase the strength utilization rate of the fiber-reinforced pultrusion rod 4a. The number of leads in the outer layer 5 is preferably 4 to 6, which is about half of the lead in the middle layer 4 in order to protect the fiber-reinforced pultrusion rod 4a. In addition, in order to prevent the side strands from deforming, the length measuring lobes, side strands 2, and tensile members 6 are twisted in the same direction, and the side strands are twisted in the same direction. 2 is preferably in the opposite direction.

FIG. 3 illustrates another embodiment of the side strand 2, in which a large number of fiber-reinforced pultrusion rods 4a are arranged concentrically in multiple layers around a core N3 made of ordinary synthetic fiber filaments. , heating to form the tensile body 7;
This tensile body 7 forms an intermediate layer 4, and a large number of ordinary synthetic fiber filaments 5b are placed outside this intermediate layer 4 and heated to form an outer layer 5. In the embodiment shown in FIG. 3, the tensile member 7 preferably has 8 to 12 leads, and the outer layer 5 preferably has 4 to 6 leads.

(Function) The middle N4 of the side strand 2 is formed of a tensile body 6.7 consisting of a fiber-reinforced pultrusion rod 4a with low elongation,
The core layer 3 is formed of a high elongation ordinary synthetic fiber filament, and as the side strands 2 are heated, the surrounding intermediate layer 4 is tensed more than the core layer 3, so that tension is applied to the side strands 2. In this case, a greater load is applied to the fiber-reinforced pultrusion rods 4a of the intermediate layer 4 than to the normal synthetic fiber filaments of the core layer 3, so that the normal synthetic fiber filaments break before the fiber-reinforced pultrusion rods 4a. Never. Since the tensile body 6.7 forms the intermediate layer 4 and this intermediate layer 4 is covered with the outer layer 5, the tensile body 6.7 is protected and its strength is maximized. can do.

Further, the side strand 2 described above is arranged around the core strand 1 consisting of a large number of ordinary synthetic fiber filaments,
Since it is heated, the side strand 2 is put under more tension than the core strand 1, and when tension is applied to the above-mentioned side strand rope, a greater load is applied to the side strand 2 than the core strand 1, and as a result, the core Since the strands 1 do not break before the side strands 2, and the side strands 2 are arranged at equal intervals around the core strand 1, the strength of the side strands 2 is maximized. Ru.

In addition, as shown in FIG. 2, when the tensile body 6 in the side strand 2 is formed by arranging a plurality of fiber-reinforced pultrusion rods 4a around the core yarn 6a, the fiber-reinforced The core yarn 6a does not break before the pultrusion rod 4a breaks, and the strength of the fiber-reinforced pultrusion rod 4a is maximized.

Therefore, the side rope of the present invention is formed of ordinary synthetic fiber filaments and a fiber-reinforced pultrusion rod 4a, and the fiber-reinforced pultrusion rod 4a has tensile strength, Young's modulus, and elongation at break. are as large as or larger than steel wires, so by using an appropriate amount of fiber-reinforced pultrusion rods 4a, strength and rigidity comparable to or greater than conventional compound lobes mixed with steel wires can be achieved. . However, fiber reinforced pultrusion rod 4
If the diameter of a is less than 0.9W, it is too m and the rigidity is insufficient, and the length-measuring lobe tends to bend when a fishing boat is moored as a length-measuring lobe.On the other hand, if it exceeds 3.0- , the rigidity is excessive, making it difficult to manufacture side lobes. The mixing ratio of the fiber-reinforced pultrusion rod 4a is 30%.
If it is less than 60%, the tensile strength will be insufficient, and if it exceeds 60%, the utilization rate of the strength will decrease.

In addition, in the embodiment shown in FIG. 2, the number of fiber-reinforced pultrusion rods 4a around the core yarn 6a,
When the number of tensile members 6 around the core strand 1 and the number of side strands 2 around the core strand 1 are 3 to 10, the balance between the tensile strength and the outer diameter of the entire lobe is good, and the above If the number is less than 2, the tensile strength as a length measuring lobe is insufficient, and if the number is 11 or more,
If the outside diameter of the lobe is too large, the structure will be complicated and manufacturing will be difficult.

On the other hand, in the embodiment shown in FIG. 3, when the tensile body 7 is formed by densely packing fiber-reinforced pultrusion rods 4a in two or three concentric layers around the core layer 3, the tensile strength of the entire lobe increases. The outer diameter is well balanced.

If the rod 4a is arranged in a single layer, the tensile strength as a length measuring lobe is insufficient, and if the number of layers is four or more, the outer diameter of the lobe becomes too large and the structure becomes complicated, making it difficult to manufacture. become. Note that the side strands in Figure 3 have a slightly lower strength utilization rate than those in Figure 2;
Although the lobes are thicker and heavier, the structure is simpler and manufacturing costs are lower.

(Example 1) As shown in FIG. 1, a diameter 15a
A six-twist compound lobe for length measurement was made by closely arranging six m side strands 2. That is, the synthetic fiber filaments 3a constituting the core layer 3 of the side strand 2 described above
Using 5 twisted 400 denier polypropylene filaments and 8 more twisted together,
Fifteen strands of this are arranged and Z-twisted at a rate of 16.7 times/m to form a strand for the core layer 3 having a diameter of 6.3 m. Also,
Five 400 denier polypropylene filaments are twisted together as the core yarn 6a of the tensile member 6, and then 8
A diameter of 1 is made by aligning 3 of these and covering the periphery with polyethylene by melt extrusion to a thickness of 0.1 m.
．． Six 6m fiber-reinforced pultrusion rods 4a,
Densely arranged, with S twist of 24 times/m, the lead is 10
, a tensile body 6 with a diameter of 4.2wm is made, six of these tensile bodies 6 are densely arranged around the core layer 3, and a Z twist of 8.3 times/m is applied so that the leads are 1O1. An intermediate layer 4 having a diameter of 12.6 m is formed, and a slit yarn 5a of polypropylene film is arranged around the outer periphery of this intermediate layer 4 to form an outer layer 5.
Add 16.7 times/m of s6, lead is 5, diameter is 1
5. Obtain five side strands 2, further arrange six of these side strands 2 closely around the core strand 1, and 6.
A compound rope with a diameter of 45 twists is made by adding Z twists of 3 times/m.

The obtained length measuring rope had a breaking strength of 45 tons, a breaking elongation of 1160%, a weight of 260 per 200 m, a pultrusion rod 4a content of 34% by weight, and a specific gravity of 0.9.
5, and instead of the fiber-reinforced pultrusion rod 4a of the above embodiment, a diameter 1.
Compared to the wire compound rope of the comparative example (diameter 48 fl) made using 0 mm steel filament, the breaking strength is the same, the weight is 0.52 times, and the underwater type i per 200 m of the compound rope of the above comparative example
It had a buoyancy of 16 kg per 200 m compared to 335 kg. Furthermore, the eye splice course radius, which indicates the difficulty of tailoring work, was 83% of that of the comparative example. When the length-measuring lobe of the above-mentioned example was laid in the sea and a foam boat was moored, it showed a sense of stability comparable to that of the comparative example, and there were no problems at all.

(Example 2) Six side strands 2 with a diameter of 18 cm were placed around a core strand 1 made of polypropylene filament with a diameter of 26 mm.
A six-strand compound rope for length measurement was made by placing the ropes in a watertight manner. That is, 400 denier polyethylene monofilament is used as the synthetic fiber filament constituting the core layer 3 of the side strand 2, and 10 of them are twisted together, and 8 of them are twisted together, resulting in 6 fibers, and 5 of the above monofilaments are twisted together. After the main twisting, one of the eight twisted wires was further twisted to form a core layer 3 having a diameter of 6.8 mm. Polyethylene is placed around this core layer 3.
．． Twelve fiber-reinforced pultrusion rods 4a with a diameter of 2.3 mm coated by melt extrusion with a thickness of 15 m are arranged in a dense array and S-twisted to form the first layer, and on the outside thereof is the same fiber-reinforced pultrusion rod as above. Arrange 18 Rondo 4a and Z
Add twist to form the second layer, lead is 9, diameter is 16
The tensile strength member 7 is used as the intermediate layer 4,
On its outer periphery, a strand 5b of 6000 denier polypropylene filament with 4 pieces of wood twisted together is arranged with 25 pieces of wood and S-twisted to form an outer layer 5 with 4 leads and a diameter of 18 fl.
0 obtained the side strand 2 of 0 then the above side strand 2
Six strands of the above were densely arranged around the core strand l and Z-twisted to make a compound lobe with a lead length of 3.5 and a diameter of 54 on. The obtained length measurement lobe has a breaking strength of 4
5 tons, breaking elongation 11.5%, weight 37 per 20on
The content of the pultrusion rod 4a is 40% by weight, the specific gravity is 0.95, and the diameter is slightly thicker than the wire compound lobe (diameter 48) of the comparative example, but the breaking strength is the same and the weight is 0. It was .72 times.

(Effects of the Invention) The length measuring lobe of the present invention has a diameter of 0.9 to
Since the intermediate layer is formed by disposing a tensile body made of fiber-reinforced pultrusion rods of 3.0 txm,
It is significantly lighter in weight than conventional compound lobes that use tensile bodies made of steel wire, making it easier to handle, and with the same rigidity as conventional ones, fishing boats can be moored safely. .

[Brief explanation of drawings]

1 is a cross-sectional view of an embodiment of the invention, FIG. 2 is an enlarged sectional view of the side strand of FIG. 1, and FIG. 3 is a sectional view of the side strand of another embodiment. l: core strand, 2: side strand, 3: core layer, 4
: Middle layer, 4a: Fiber-reinforced pultrusion rod, 5
: Outer layer, 6.7: Tensile body.

Claims (1)

[Claims] [1] A plurality of side strands are arranged and heated around a core strand consisting of a large number of ordinary synthetic fibers with relatively high elongation, and these side strands form a core layer, an intermediate The core layer and the outer layer are made of ordinary synthetic fiber filaments with relatively high elongation, and the middle layer is made of reinforcing fibers of ultra-high strength polyethylene filament with relatively low elongation and a matrix resin. A rope for lining a fishing net, characterized in that it is made of a tensile material made by twisting together a large number of fiber-reinforced pultrusion rods of 0.9 to 3.0 mm.