JP3573221B2 - Longline rope - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a longline rope such as a trunk line and a branch line for longline fishing, and more particularly to a longline rope having a stiff workability.
[0002]
[Prior art]
Conventionally, there has been a technique for improving the abrasion resistance of a rope mainly made of a monofilament or a multifilament for a longline rope made of a synthetic fiber and having a fluff on the surface thereof. A method in which a spun yarn of synthetic fiber is arranged on the surface to have fluff on this surface, or a yarn obtained by looping a synthetic filament multifilament, a false twisted yarn, a multifilament yarn, and a spun yarn are aligned. In addition, there is one in which a core yarn type yarn is wrapped. However, although the spun yarn has the same handling, workability, and texture as the longline consisting of only the spun yarn, it does not have sufficient bending fatigue resistance, abrasion resistance, and strength per unit weight. Moreover, it is coated with a resin to satisfy the requirements of a rugged rope required for operation.
[0003]
Further, although some yarns using multifilament looped yarns or false twisted yarns are intended to improve a part of the spun yarns, they are also covered with resin to form waist ropes. The purpose of this waist is important. In the operation of longline fishing, a rope without a waist tends to have a habit such as a kink, and the rope is kinked by the unloading and hoisting storage work, thereby significantly impairing workability. If the twist is tight to prevent this, the strength contribution of the used yarn to the rope is greatly reduced, and the practicality is poor.
In addition, the above resin-coated ones have a problem that the cost is increased due to the complexity of the manufacturing process and the handleability is reduced due to an increase in weight.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to provide a rope for longline which imparts appropriate strength by setting the number of twists in a specific range, and has a stiffness of the rope without coating with resin and excellent in workability. .
[0005]
[Means for Solving the Problems]
That is, the present invention is characterized in that, in a longline rope using synthetic fibers, the synthetic fibers are actually twisted with a lower kneading coefficient of 3.0 or more and a twist of 6.0 or more. Longline rope to do.
2. The longline rope according to claim 1, wherein synthetic fibers having a large number of fluffs are arranged on the rope surface.
3. The longline rope according to claim 1, wherein a high-strength yarn having a strength of 15 g / d or more is disposed on a core portion of the synthetic fiber.
4. The longline rope according to claim 3, wherein the high-strength yarn is made of a high-molecular-weight polyethylene fiber or an aramid fiber.
It is.
[0006]
First, the synthetic fiber used in the present invention refers to a multifilament yarn composed of synthetic fibers such as polyester, polyamide, and polyethylene, and is preferably a polyester multifilament yarn from the viewpoint of light fastness.
Further, the synthetic fiber may be a processed yarn such as a so-called Taslan processed yarn or a false twisted yarn obtained by air turbulence processing.
[0007]
Next, the number of twists, which is an important element in the present invention, will be described. The synthetic fiber used in the present invention has been subjected to specific priming and plying, but the plying must have a plying factor of 3.0 or more and the plying factor of the plying must be 6.0 or more. .
If the twist coefficient of the lower twist is less than 3.0, it is difficult to prevent kink and kinking even if the number of twists of the upper twist is increased, and the rigidity of the rope is reduced. Desirably, it is 4.0 or more. On the other hand, when the twist coefficient of the upper twist is less than 6.0, even if the number of twists of the lower twist is desirable, the effect of preventing kink and twisting, and furthermore, the rope becomes less rigid. It is desirably 7.0 or more, more preferably 7.5 or more. As described above, by using the twisting condition and the high-strength yarn together, even if the resin coating is omitted, kink and kinking can be prevented, and a waisted rope can be provided.
[0008]
Further, the synthetic fiber of the present invention is preferably a core-sheath type composite yarn in which a high-strength yarn is provided in a core portion and a synthetic fiber having a large number of fluffs is provided in a sheath portion.
Here, the high-strength yarn disposed on the core portion has a strength of 15 g / d, preferably 30 g / d or more, and includes a high-molecular-weight polyethylene fiber or aramid fiber having a weight-average molecular weight of 600,000 or more. If the strength is less than 15 g / d, the strength decrease rate due to an increase in the number of twists increases, and thus the rope is used as a longline rope, which is inferior in practical use. At this time, it is desirable that the high-strength yarn be twisted with a synthetic fiber having fluff covering the surface if possible. This is because many of the high-strength yarns are vulnerable to abrasion and those that are liable to decrease in strength when exposed to ultraviolet rays. The purpose of arranging the fluff yarn on the sheath is the same as the conventional aim, such as improving the abrasion property and increasing the strength at the time of knotting with the instrument and the rope.
[0009]
In other words, the present invention adjusts the number of twists so that a kink or twist does not occur, even without resin coating, so that it does not become a rigid rope, and reduces the strength contribution rate of the yarn for increasing the number of twists with high strength The use of the yarn is intended to maintain the strength of the longline rope as a whole.
[0010]
The high-strength yarn preferably has a twist number of less than 3.0 or simply aligned in order to maintain a high strength contribution to the rope. Such a twisting method can be performed by using a fryer twisting machine of a rope manufacturer. It is difficult with a ring twisting machine. As a method for obtaining a fluffy yarn, a method of mixing a spun yarn into a multifilament, a method of mixing cotton, and a method of air entanglement of a so-called Taslan processed yarn can be used. However, it is still not preferable to use 100% spun yarn. The reason for this is that spun yarn is basically softer than 100% filament or a mixture of filament and spun yarn even if the number of twists is increased. Longline ropes made in these ways may be heat set. However, depending on the material of the high-strength yarn, the heat setting may cause a decrease in strength. The definition of priming described here is priming in the case of two-stage laying (combination of priming and plying), but of the three-stage laying (combination of priming, medium-twisting and plying). It means that the twist coefficient of the lower twist at that time is 2.0 or more.
[0011]
A method for producing the above-described synthetic fiber or core-sheath type synthetic fiber will be described.
In the case of two-stage twisting, a sheath obtained by twisting (primarily twisting) a sheath portion with one or a plurality of synthetic fibers is used as a core portion obtained by combining a high-strength yarn with a core portion. Further, a strand obtained by twisting (twisting) a plurality of such twisted yarns is used as a rope for longline. Two-stage twisting is used when the number of fibers constituting the twisted yarn is relatively large. For example, a twisted yarn having six core yarns and nine sheath yarns may be used.
In the case of three-stage twisting, a plurality of strands obtained by the two-stage twisting are further twisted (up-twisted) to form a rope for longline.
In this case, the lower twist corresponds to the upper twist referred to as two-stage twist.
The three-stage twist is used when the number of fibers of the twisted yarn is relatively small. For example, a twisted yarn in which two core yarns and three sheath yarns are provided.
[0012]
【Example】
(Example 1)
Sixteen 1600 denier (30 g / denier) ultrahigh-strength polyethylene multifilaments pre-bunched as high-strength yarns and nineteen 1500 denier polyester multifilaments that are looped by air entanglement to form a loop-like fluff Then, a twist of 85 times / m was applied by S-twisting in such a manner that an ultra-high-strength yarn bundle was wrapped around the center and a polyester multifilament loop yarn was wrapped around to obtain a 28630-denier twisted yarn. The twist coefficient was 5.0. Next, three of the twisted yarns were twisted at a rate of 80 times / m with a Z twist using a strander for fine objects to obtain a twisted yarn of 101,700 denier. The twist coefficient was 8.89. The tensile strength of this longline rope was 460 kgf, the rope diameter was 4.25 mm, and the knot strength was 260 kgf. This rope had a rigidity of 230 mm according to the following measurement method without the resin coating and without the heat setting, and was a strong rope which was not inferior to the conventional resin-coated product (245 mm). The rigidity was in accordance with the 45 ° cantilever method of rigidity of JISL1096. The calipers were used for the rope diameter, and the number of twists was measured according to JIS L1013. The tensile strength was measured according to JIS L 1013, using a test machine at a constant speed elongation type, a distance between marked lines of 20 cm, and a tensile speed of 20 cm / min. Also, the knot strength was measured at a tensile speed of 20 cm / min according to JIS L 1013.
[0013]
(Comparative example)
A twisted yarn having a twist coefficient of 2.56 was formed by S-twisting in the same combination as in Example 1, and then three of the twisted yarns were twisted to have a twisting factor of 5.0 by Z-twisting. The tensile strength of this twisted yarn was 476 kgf, the rope diameter was 4.85 mm, and the knot strength was 273 kgf. The rigidity of this longline rope was as low as 145 mm.
[0014]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, it became possible to provide the rope for longlines which is stiff and excellent in workability without coating with resin.

Claims (4)

A longline rope using a synthetic fiber, wherein the synthetic fiber is actually twisted with a lower kneading coefficient of 3.0 or more and a top knitting of 6.0 or more. 2. The longline rope according to claim 1, wherein synthetic fibers having a large number of fluffs are arranged on the surface of the rope. 3. The longline rope according to claim 1, wherein a high-strength yarn having a strength of 15 g / d or more is disposed on a core portion of the synthetic fiber. 4. The longline rope according to claim 3, wherein the high-strength yarn is made of a high-molecular-weight polyethylene fiber or an aramid fiber.