JP7478496B1 - Rope, strand, and method for manufacturing the same - Google Patents

Abstract

[Problem] To provide a rope or strand that is highly productive, resistant to deformation, and easy to work with. [Solution] A rope 1 includes a rope body 2 formed by twisting together three or more strands 4, and a twist stop thread 3 that sews together one rope body 2 over the entire length of the rope body 2 and in parallel to the length of the rope body 2. The rope 1 preferably has a flat cross section. In addition, the rope body 2 is preferably formed by twisting together three strands 4. [Selected Figure] Figure 1

Description

The present invention relates to ropes and strands.

Conventionally, for example, in seaweed cultivation, a cultivation net and a rope with a diameter of about 6 mm are used to secure the net to a support, as shown in Patent Document 1. When using a rope, there is a problem of the rope losing its shape, such as openings in parts, and in order to prevent this, it is necessary to twist it tightly. However, there is a problem that twisting it tightly reduces ease of use and workability.

Due to these problems, braided cords are often used instead of ropes in seaweed farming. However, braided cords have problems such as low production efficiency and high costs.

The applicant proposed the rope described in Patent Document 2. Patent Document 2 describes a rope in which a monofilament thread and a high-strength thread are inserted into the strand core of a triple-twisted rope.

However, there is a demand for further improvements in production efficiency and workability for the rope in Patent Document 2.

For other thin ropes, such as those with a diameter of about 4 to 5 mm, kongou-uchi ropes are often used for applications such as pitching tents. Although kongou-uchi ropes are easy to work with, they have the problem of low productivity, and there is a demand for ropes with high production efficiency.

JP 2004-313158 A JP 2020-133086 A

Therefore, the present invention aims to provide a rope or strand that is highly efficient to produce, less prone to deformation, and easy to work with.

The present invention is a rope comprising a rope body formed by twisting together three or more strands, and a twist-stop thread that sews the rope body together over the entire length of the rope body and parallel to the length of the rope body.

Here, "throughout the entire area" means substantially the entire area, and specifically means that 80-100% of the entire length of the rope is sewn with twist-stop thread.

It is preferable that the rope has a flat cross section.

The rope body is preferably made of three twisted strands.

It is preferable that the rope body is twisted at a twist pitch that is 10 to 50% longer than that of a parallel braided rope.

The rope is preferably used to connect a net sheet used in seaweed cultivation to a support pole for fixing the net sheet.

The rope is preferably used for pitching tents.

The present invention also provides a strand comprising a strand body formed by twisting together a plurality of yarns, and a twist-stop thread that sews together the strand body over the entire length of the strand body and parallel to the length of the strand body.

The present invention also provides a rope in which multiple strands are twisted together.

The present invention also provides a method for manufacturing the strand, which includes a step of twisting yarns together to form a strand body, a step of pre-twisting the strand body by immersing it in a water-soluble resin and drying it, and a step of sewing a twist-fixing thread to the strand body after the resin has dried using a sewing machine.

According to the present invention, it is possible to provide a rope or strand that is highly efficient to produce, is less likely to lose its shape, and is easy to work with. Because the rope or strand of the present invention has high production efficiency, it can be provided at low cost.

FIG. 2 is a schematic plan view for explaining the rope according to the first embodiment. This is a cross-sectional view taken along the line XX in FIG. 1 is a photograph of a rope according to a first embodiment. FIG. 11 is a schematic plan view for explaining a strand according to a second embodiment.

A first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, a rope 1 includes a rope body 2 formed by twisting together three strands 4, and a twist stopper thread 3 for sewing the rope body 2 along the length direction of the rope body 2 and fixing the twist of the rope body 2.

As shown in FIG. 3, each strand 4 constituting the rope body 2 is formed by twisting together yarn 51, which is an assembly of multiple multifilaments, and yarn 52, which is an assembly of spun yarn. The average diameter of the strand 4 is 1 to 10 mm, preferably 2 to 5 mm. The average diameter of the rope 1 is 3 to 30 mm, preferably 4 to 10 mm.

As shown in FIG. 1, the twist stop thread 3 is sewn in the center of one rope body 2 in plan view, parallel to the length direction of the rope body 2. The twist stop thread 3 penetrates one rope body 2 from the top to the bottom. The stitches of the twist stop thread 3 are present on the top and bottom surfaces of the rope 1, but in both cases, as shown in the photograph of FIG. 3, they are embedded in the surface of the rope 1. The twist stop thread 3 partially sews all the strands 4 in a twisted state, fixing the twist. The sewing is preferably performed by sewing. The upper and lower threads are both made of polyester fiber, but this is not limited to this.

The twist-stop thread 3 is sewn over the entire length of the rope body 2. Specifically, it is preferable that 80 to 100% of the entire length of the rope body 2 is sewn with the twist-stop thread 3. The twist-stop thread 3 is sewn to one rope body 2 with a straight stitch. To ensure that the twist is fixed reliably, it is preferable that the stitches of the twist-stop thread 3 are shorter than the length L (see Figure 1) obtained by dividing the twist pitch P by the number of twists (3 in this embodiment).

As shown in Figure 2, it is preferable that the rope 1 has a flat cross section. After the rope body 2 is formed, it is sewn while being pressed down with a sewing machine presser foot to obtain the flat rope 1. If the cross section is approximately elliptical, the major diameter D1 of the rope 1 is preferably 5 to 15 mm, and the minor diameter D2 of the rope 1 is preferably 3 to 12 mm. The twist stop thread 3 is located in the center of the major diameter D1. Because the rope 1 has a flat cross section, it fits comfortably in the hand and is easy to work with.

Rope 1 is not limited to a three-strand rope, but may be formed by twisting together multiple strands, 3 or more and 8 or less.

According to the present invention, the twist is firmly fixed throughout the rope 1, and even if it is not a hard twist, it does not lose its shape when used and is easy to work with. It also has high production efficiency compared to braided cords. Furthermore, even with a loosely braided rope, a rope is formed that does not lose its shape when used, so there are advantages in that it can have high tensile strength and is inexpensive. For a loosely braided rope, the strands are preferably twisted at a twist pitch that is 10 to 50% longer than that of a straight braided rope.

In this embodiment, the diameter of the strand 4 is 2 to 5 mm, and the twist pitch P is 20 to 30 mm. The twist pitch P is preferably 2.5 times or more, more preferably 3.0 times or more, and even more preferably 3.2 times or more, of the minor diameter D2 of the cross section of the rope 1.

The rope 1 of the present invention is manufactured by twisting multiple yarns together to form strands 4, twisting multiple strands 4 together to form the rope body 2, and then sewing the twist stop threads 3 in a straight line parallel to the length of the rope body 2 using a sewing machine.

The rope 1 according to the present invention is preferably used, for example, in pole-type seaweed cultivation. Pole-type seaweed cultivation is carried out in relatively shallow waters, with poles driven into the sand and strip-shaped nets tied to the poles, and the rope 1 according to the present invention can be used to connect the poles and the nets. When used in seaweed cultivation, the average diameter of the rope 1 (in the case of a flat rope, the average value of the major diameter D1 and minor diameter D2) is preferably 6 to 15 mm. Since the rope 1 according to the present invention is a parallel braid or loosely braided rope, it has higher tensile strength and workability than a tightly twisted rope, and also has high production efficiency.

Another use of the rope 1 according to the present invention is tent pitching. For example, the rope 1 is used to connect an iron pipe to a tent sheet. When used for tent pitching, the average diameter of the rope 1 is preferably 3 to 5 mm. While maintaining high workability, it is more economical, with higher production efficiency and lower costs than the currently widely used kongou-uchi ropes.

Next, a second embodiment of the present invention will be described with reference to FIG.
The second embodiment is characterized in that a twist-stop thread 13 is sewn to the strand body 12.

The strand 11 comprises a strand body 12 formed by twisting together a number of yarns 14, and a twist-stop thread 13 for sewing the strand body 12 along the length of the strand body 12 and fixing the twist of the strand body 12.

The strand 11 can be used alone, but can also be twisted together to form a rope. The diameter of the strand 11 is preferably 3 to 6 mm, and more preferably 4 to 5 mm. It is also preferable that the cross section of the strand 11 is flat. It is also preferable that the strands are loosely twisted, twisted at a twist pitch that is 10 to 50% longer than that of parallel twisted strands.

Because the strand 11 is single-twisted (left-twisted in most cases), it is prone to kinking, and if a kink occurs, the strength of that part will decrease. However, the presence of the twist-stopping thread 13 makes kinking less likely to occur, prevents deformation, and improves workability.

The twist-stop thread 13 that sews the strand body 12 is preferably made of polyester fiber, and the twist-stop thread 13 is preferably sewn to the strand body 12 by sewing. Since the strand body 12 is one-twisted, it cannot be sewn as is, so it is preferably fixed by attaching a water-soluble resin to prevent false twisting before sewing. Even if the water-soluble resin dissolves during use, for example by being immersed in water, the twist-stop thread 13 ensures that the twist is fixed.

The manufacturing method of the strand 11 will be described. First, the yarns 14 are twisted together to form the strand body 12. The strand body 12 is then immersed in a water-soluble resin and then dried to fix the twist (false twist fixing process). Then, the twist fixing thread 13 is sewn to the strand body 12 by a sewing machine.

The present invention is not limited to the above embodiment, and modifications can be made without departing from the technical concept of the present invention. Such modifications and equivalents are also included in the technical scope of the present invention, and it goes without saying that various forms may be adopted as long as they fall within the technical scope of the present invention.

1: Rope 2: Rope body 3, 13: Twist stopper thread 4, 11: Strand 12: Strand body 14: Yarn D1: Long diameter D2: Short diameter P: Twist pitch

Claims (9)

A rope body formed by twisting together three or more strands;
A twist stop yarn that sews one of the rope bodies over the entire length of the rope body and parallel to the length of the rope body;
Equipped with a rope. The rope has a flat cross section.
2. The rope of claim 1. The rope body is formed by twisting three of the strands together.
3. The rope according to claim 1 or 2. The rope body is twisted at a twist pitch that is 10 to 50% longer than that of a parallel-braided rope.
3. The rope according to claim 1 or 2. It is used to connect a net sheet used in seaweed cultivation to a support for fixing the net sheet.
3. The rope according to claim 1 or 2. Used for pitching tents
3. The rope according to claim 1 or 2. A strand body formed by twisting a plurality of yarns together;
a twist-stop thread that sews together one of the strand bodies over the entire length of the strand body and in parallel with the length of the strand body;
A strand comprising: A rope formed by twisting together a plurality of strands according to claim 7. A method for producing the strand of claim 7, comprising the steps of:
twisting the yarns together to form a strand body;
a false twist fixing step of immersing the strand body in a water-soluble resin and drying it;
a step of sewing a twist fixing thread to the strand body after the resin has dried with a sewing machine;
A method for manufacturing a strand comprising the steps of:

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