JP3424279B2 - Japanese bow string - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a warp string constituting a Japanese bow string with high strength and is firmly fixed by a resin adhesive to make it hard, and when the arrow is shot, the Japanese bow and the string come into contact with each other. The present invention relates to a Japanese arch string that collides and emits a preferable sound (called a string sound).

[0002]

2. Description of the Related Art Traditionally, Japanese bowstrings were made of polyester fibers, but with the advent of aramid fibers of low elongation and high strength, conventional polyester fibers were gradually replaced by aramid fibers. Japanese arch strings, which consist of fibers fixed with a resin adhesive, have come to be mainly used.

[0003]

Although the conventional aramid fiber has a high tensile breaking strength, it has a low bending fatigue property and abrasion fatigue property with respect to edging and the like, and has a short life as a Japanese arch string. After that, super-strong polyethylene multifilament fiber, for example, Dyneema SK60 manufactured by Toyobo Co., Ltd. was developed, and due to its excellent bending fatigue property and wear fatigue property, in the case of the Western bow which is already in the shooting competition, it is Due to the lack of such stringent restrictions on string sound, super-high-strength polyethylene multifilament yarn has been mainly used in place of conventional aramid fiber. However, in the case of Japanese arch strings, it is necessary to solidify the fiber bundle with a resin adhesive to harden the Japanese arch strings as described above, and it is sufficient to bond only ultra-high-strength polyethylene fibers with low adhesiveness to the resin adhesive. It was difficult to manufacture a Japanese bow string with hardness.

According to the present invention, a Japanese bow and a Japanese bow string are obtained by firmly fixing a composite thread of an ultra-high-strength polyethylene multi-filament thread and a nylon or polyester multi-filament thread with a resin adhesive to make a hard finish. The object of the present invention is to produce a Japanese bow string that produces a preferable old-fashioned string sound when touched, has a high strength, is durable, and has a high hardness as a string.

[0005]

The first aspect of the present invention is that the weight average molecular weight is 500,000 or more, the tensile breaking strength is 15 g / d or more, the tensile breaking elongation is 6% or less, and the initial tensile breaking elastic modulus is 450 g / d.
The present invention relates to a Japanese bowstring characterized by using a composite yarn of a super-high-strength polyethylene multifilament yarn of d or more and a general-purpose polyester or nylon multifilament yarn as a constituent element, the second of which is a weight average molecular weight. Denier for the ultra-high strength polyethylene multifilament yarn used in the first invention having a tensile strength at break of not less than 500,000, a tensile strength at break of not less than 15 g / d, an elongation at break of not more than 6% and an initial elastic modulus at break of not less than 450 g / d. 20% or more when expressed
The present invention relates to a Japanese bow string, characterized in that a composite yarn containing less than 0% of a general-purpose multi-filament yarn such as polyester or nylon is fixed with a resin adhesive.

A Japanese bowstring using 100% of Dyneema SK60 has a high strength and a thin Japanese bowstring is produced, but it has a sufficient hardness of the above-mentioned Japanese bowstring, which is a characteristic of the Japanese bowstring, and a fiber bundle. It is absolutely necessary to have the glued together to produce the string sound when shooting a Japanese bow, but the Dyneema SK6
No. 0 has low adhesiveness with resin adhesive, and DENIL SK60,
When it is 100%, it is extremely difficult to select a resin adhesive capable of producing a Japanese bow string having sufficient hardness. Therefore, the present invention is 20% in denier with respect to the Dyneema SK60.
As described above, by using the composite yarn of less than 50% of general-purpose nylon or polyester multi-filament and the yarn, the super high strength of Dyneema SK60 is utilized and the adhesiveness with the resin adhesive is improved. , The filament yarns were firmly adhered to each other and succeeded in producing a Japanese bow string having sufficient hardness.

Further, by using the Japanese bow string of the present invention, it has become possible to generate a conventional preferable string sound by the contact between the Japanese bow and the Japanese bow string when the Japanese bow is shot.
An example of a load extension curve (abbreviated as S-S curve) of Dainima SK60 and a composite yarn of Dainima SK60 and nylon or polyester multifilament yarn is shown in FIG. (1) shows the SS curve of the dyneema 400d, 100%, (2) the above composite yarn, and (3) the nylon multifilament yarn (420d / 48f) for reference.

The tensile strength at break of Dyneema SK60 is 15
If it is less than g / d, the tensile elongation at break exceeds 6%, and the initial elastic modulus at tensile break is less than 450 g / d, it is used as a Japanese bow string, and the strength of the Dyneema SK60 is low as a Japanese bow string. The outer diameter of the bowstring cannot be made sufficiently thin, and at the same time, it is impossible to create a Japanese bowstring having a good string sound due to the adhesiveness. In order to increase the adhesive strength of the Dyneema SK60 with the resin adhesive, the mixing ratio of general-purpose nylon or polyester multifilament yarn is preferably 20 to 50%.
If it is less than%, the adhesive strength of the composite yarn with the resin adhesive is low, and the hardness is insufficient, so that it does not produce the preferable string sound of the traditional Japanese string, and if it exceeds 50%, it will be regarded as a Japanese string. Although the hardness of the composite yarn is sufficient, it is difficult to make a Japanese bowstring which is thin and has high strength required for the Japanese bowstring, and which is excellent in bending and wear fatigue, and both are not suitable for the present invention.

The above-mentioned composite yarn of the present invention is a Dynaimer SK60.
On the other hand, a general-purpose polyester or nylon multifilament yarn is entangled more than just aligned, and a special entanglement composite yarn, so-called mixed yarn, is used to improve the adhesion with the resin adhesive. By doing so, it is possible to manufacture a Japanese arch string having good performance.

Here, the air-blended yarn is a method manufactured by a method according to the composite yarn manufacturing apparatus described in JP-A-2-175938 filed by the present applicant, that is, the Dyneema SK60. Overfeed rate Nylon or polyester multifilament yarns with high elongation at break
The above-mentioned Japanese Patent Laid-Open No. 2-175 in which the setting is made larger than the feed rate.
It may be a composite yarn manufactured by a method similar to the interlacing device shown in FIGS. 2 and 3 attached to No. 938,
Further, it may be an air-blended yarn prepared by reversing the overfeed rate. By using the air-mixed yarn, the adhesiveness of the composite yarn with the resin adhesive is good and sufficient hardness as a Japanese arch string can be obtained.

As the resin adhesive, any natural or synthetic resin adhesive can be used, but a synthetic resin adhesive which cures at room temperature is preferably used. For example, vinyl resin, acrylic resin, thermoplastic resin such as fiber resin, phenol resin, urea resin, melanin resin, polyamide resin,
Thermosetting resin or rubber such as polyester resin, alkyd resin, epoxy resin, polyurethane resin, casein,
A natural resin adhesive such as glue is used. In particular, it is preferable to select a processing method and a type of resin adhesive which have a relatively low melting point and do not damage the Dyneimer SK60.

Next, the present invention will be described with reference to examples.

[Examples 1 to 4 and Comparative Examples 1 to 4] The properties of each composition as a Japanese arch string are summarized in [Table 1].

[0013]

[Table 1]

[0014]

The effects of the present invention are summarized as follows. As shown also in [Table 1], the Japanese bowstring produced according to the present invention has strength as a Japanese bowstring, and the string sound is not inferior to that of ancient Japanese bowstrings, and the user is sufficiently satisfied. Used. Has great wear-fatigue resistance against galling and has a long life as a Japanese bow string.

[Brief description of drawings]

FIG. 1 Dyneema SK60, 100% yarn, Dyneer
30% of general-purpose nylon multifilament to MA SK60
S-S of the multi-filament yarn of the general-purpose nylon (420d / 48f) and the composite yarn of the present invention with the mixed yarn
An example of the curve is shown.

[Explanation of symbols]

1. S-S curve of Dyneema SK60 (400d) 2. S-S curve of composite yarn of Dyneema SK60 and general-purpose nylon multifilament 3. General nylon (420d / 48f) multifilament yarn SS curve

Claims (2)

(57) [Claims] 1. A weight average molecular weight of 500,000 or more, a tensile breaking strength of 15 g / d or more, a tensile breaking elongation of 6% or less,
A Japanese arched string characterized by using, as a constituent element, a composite yarn of an ultra-high-strength polyethylene multifilament yarn having an initial elastic modulus at tensile breaking of 450 g / d or more and a multifilament yarn such as polyester or nylon. 2. The ultra high strength polyethylene multifilament yarn according to claim 1, when expressed in denier, 20%.
As described above, a Japanese bow string, characterized in that a composite yarn containing less than 50% of a general-purpose multifilament yarn such as polyester or nylon is hardened with a resin adhesive.