JP4642414B2 - Serving braid or twisted string - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a bowstring serving braid or twisted yarn, and more particularly to a bowstring serving braid or twisted yarn comprising a braid formed by forming a plurality of filaments or a twisted filament.

  Usually, in the reverb bow (Fig. 1-1) and compound bow (Fig. 1-2), which is called a “bow”, the part that is used to reinforce the strings, especially the ends of the strings (1, 1 ') and the arrows at the center. In order to reinforce (2), a reinforcing material called a serving (film material) is used. This is because both ends (1, 1 ') of the string and the part (2) that holds the arrow repeatedly contact the bow body or the arrow, and a strong external force is applied. Therefore, very high breaking strength, wear resistance, dimensions This is because stability and durability are required.

Conventionally, as a serving used in a bowstring, a braid or twist of 100% polyester multifilament, a braid or twist of 100% high-strength multifilament, or a braid or twist of a combination of high-strength multifilament and polyeltel multifilament Has been used.
However, in recent years, with the improvement in quality and performance of archery, the load on strings and serving tends to increase. For this reason, the conventional serving mainly of polyester multifilaments cannot satisfy the required breaking strength, abrasion resistance, dimensional stability and durability.

In order to satisfy such requirements, braids using high-strength filaments have attracted attention, and several attempts have been made. It is clear that braids using high-strength filaments have the following problems. Became.
That is, braids using high-strength filaments such as polyparaphenylene terephthalamide (PPTA), polybenzimidazole (PBI), and polybenzoxazole (PBO) should be used in harsh environments where the bow is exposed to ultraviolet rays. When considered, weather resistance and light resistance are not sufficient.

  On the other hand, high-strength multifilament made of ultra-high-molecular-weight polyolefin is excellent in weather resistance, and braided or twisted yarn that combines 100% high-strength multifilament or high-strength multifilament with polyeltel multifilament is serving. It has been practically used as

  A braid using a high-strength multifilament made of a stretched product of ultra-high molecular weight polyolefin is excellent in abrasion resistance due to the breaking strength and slipperiness of the fiber itself. However, since the serving is wrapped around the bowstring and covers the surface of the string, winding deviation occurs when the number of uses increases. This is due to the fact that the high-strength multifilament made of a stretched product of ultrahigh molecular weight polyolefin has a small elongation and has almost no restoring property.

In order to solve the above problems, braids or twisted yarns in which high-strength multifilaments made of stretched ultra-high molecular weight polyolefins and polyertel multifilaments having resilience are combined have begun to be used. In this braided or twisted yarn, the initial form stability is improved, but the polyester multifilament has low abrasion resistance, intense fluffing, and unwinding occurs from the fluffed portion, which is not satisfactory as a serving.
Despite these problems, most of the servings currently used use polyester multifilaments, high-strength multifilaments made of stretched ultra-high molecular weight polyolefins, or composites thereof. It was a braid.

  The object of the present invention is to solve the problems of the conventional serving braid or twisted yarn as described above, and to satisfy extremely high demands on the breaking strength, wear resistance, dimensional stability and durability of the serving. It is to provide a bowstring serving braid or twisted yarn.

  According to the present invention, the object is composed of a braid formed by forming a plurality of filaments or a twisted yarn of a plurality of filaments, at least a part of the filaments is a high-strength multifilament, and the remaining filaments are monofilaments It is achieved by a serving braid or twisted yarn of a bowstring characterized by

According to the bowstring serving braid or twisted yarn of the present invention, as compared with a conventional polyester multifilament 100%, high strength multifilament 100%, or a combination of polyertel multifilament and high strength multifilament, Breaking strength, wear resistance, durability, dimensional stability, and the like can be improved in a balanced manner. Further, the occurrence of winding deviation can be reduced at both ends of the string to which a force for crushing the serving surface is applied and at the center where the arrow is broken.
In addition, when the serving of the present invention is used for the part that crosses the arrow, since the wound serving has a satin surface, when the bow is drawn, the contact area with the fingertip protection tab that is usually made of leather and has high frictional resistance with the serving , The frictional resistance can be reduced, and the initial speed of the arrow is not reduced.

  In the present invention, “at least a part of the filaments is a high-strength multifilament and the remaining filaments are monofilaments” means that a high-strength multifilament is used for any number of one or more of the constituent filaments, The remaining filament is made of braided or twisted yarn using monofilament, the high-strength multifilament and other filaments are aligned or twisted to form a braided or twisted yarn, or The core is formed of arbitrary filaments (for example, high-strength multifilaments, or multifilaments such as polyester, polyamide, polyethylene, polyolefin, fluorine fiber, and monofilaments thereof), and the sheath is formed of high-strength multifilaments and monofilaments. It means that more formed.

  In the present invention, the high-strength multifilament preferably has a breaking strength of 15 cN / dTex or more, more preferably 25 cN / dTex or more. Further, the elongation at break of the high strength multifilament is preferably 7% or less, more preferably 6% or less, particularly preferably 5% or less, and the initial elastic modulus is preferably 500 cN / dTex or more, more preferably 600 cN. / DTex or more.

As the high-strength multifilament, an ultrahigh molecular weight polyolefin multifilament having a weight average molecular weight of 1 million or more is preferably used.
In particular, it is obtained by stretching ultra-high molecular weight polyethylene having a weight average molecular weight of 1 million or more at a high magnification of 10 times or more, which is lightweight and has excellent breaking strength, wear resistance, dimensional stability, and durability. Ultra high molecular weight polyethylene multifilaments are preferred.

  Methods for producing such ultra high molecular weight polyethylene multifilaments are known. For example, JP 59-216912, JP 59-216913, JP 59-216914, JP JP-A-60-45630, JP-A-60-52647, JP-A-60-52613, JP-A-60-59172, JP-A-60-151131, JP-B-3-57964, etc. Is disclosed.

  A method of manufacturing a braid from such ultrahigh molecular weight polyethylene multifilament is also known, and is disclosed in, for example, Japanese Patent Application Laid-Open No. 10-317289.

As a monofilament preferably used in combination with a high strength multi-strength filament, a polyester monofilament is preferred. In addition to this, nylon 6, nylon 6,6, 6,10, or these copolymer nylon monofilaments and polyvinylidene fluoride monofilaments are exemplified, but not limited thereto.
The elongation of the monofilament is usually about 25% or less, preferably about 20% or less, more preferably 17% or less.

Hereinafter, preferred embodiments of the serving bowstring or twisted yarn of the present invention will be described.
The serving bowstring or twisted yarn for a bowstring of the present invention has three, four, six, eight, twelve, sixteen, twenty-four, thirty-two, three-punched yarns. It consists of a braid braided into a form such as batting or a twisted yarn having a form of two twists, three twists, four twists, five twists, six twists, seven twists, eight twists, or the like.

  A high-strength multifilament is used for at least one of the filaments constituting the braid or twisted yarn, and the filaments are twisted or twisted together with the monofilament. For example, as shown in FIG. 2, four high-strength multifilaments (11) and four monofilaments (12) are used to form a filament.

  In view of the above-mentioned requirements for the serving characteristics, in a more preferred form, filaments made only of ultra high molecular weight polyethylene filaments and filaments made only of polyester monofilaments are individually arranged by drawing or twisting, for example, the former four, The latter four are used and braided into eight pieces to form a serving braid.

  In this preferred serving, even when a load is applied, the load stress is concentrated only on the ultrahigh molecular weight polyethylene filament, which is a low elongation filament, and as a result, the elongation of the entire braid can be kept small, so that the load is applied. Even if used in a state, the diameter of the braid is not reduced. Also, since the fiber itself is combined with a hard polyester monofilament, the circular shape of the braid cross section is maintained, and since the filaments are combined with different thicknesses, the braid surface becomes uneven (Fig. 2). Thus, the frictional resistance against the string that is a contact object can be reduced, and the wear resistance can be improved.

  Although the thickness of the filament can be arbitrarily selected, it is preferably 11 to 5280 dTex, more preferably 55 to 1760 dTex, and most preferably 110 to 880 dTex in a high-strength multifilament. On the other hand, in the case of a monofilament, it is preferably 5 to 2200 dTex, more preferably 10 to 1100 dTex, and most preferably 15 to 275 dTex.

  In the present invention, a high-strength multifilament and a polyester monofilament may be combined and used. The ratio of the two is not particularly limited, but the ratio of the high-strength multifilament is 60% by weight or more, preferably 80 gravity% or more, more preferably 90% or more. Therefore, the ratio of monofilament is 40% by weight or less. , Preferably 20% by weight or less, more preferably 10% by weight or less.

  The reason why the braid surface becomes a textured surface with irregularities as described above is considered as follows. Since the fiber cross section of the monofilament is larger than that of the multifilament, rigidity is easily generated. Therefore, moderate stiffness or hardness is produced, and the monofilament is not easily flattened. On the other hand, in the case of a multifilament, the structure is easily changed due to an aggregate of fibers, and the braid surface is likely to be flat. Accordingly, the frictional resistance is increased.

  The serving of the present invention that makes use of the moderate stiffness or hardness of the monofilament that is not easily crushed has the effect of preventing winding slippage. Normally, the serving is wound in a direction of approximately 90 degrees with respect to the length direction of the bowstring, so that the monofilament bites in as if a wedge is driven into the bowstring, and the serving is fixed to the string. On the other hand, in the case of serving consisting only of multifilaments, it is difficult to bite into the bowstring because of the softness of the multifilament fibers, and therefore the serving will shift as the number of uses increases.

  The filaments constituting the serving braid or twisted yarn of the present invention can also be integrated with a thermoadhesive resin. As such resins, polyolefin resins, polyester resins, polyamide resins, and the like can be used.

Abrasion resistance can be improved by applying a resin to the surface of the serving braid or twisted yarn of the present invention. The type of resin for improving the wear resistance is not particularly limited. For example, ethylene-acrylic acid copolymer, low molecular weight polyethylene, low molecular weight ionomer, high molecular weight ionomer, polyurethane, etc. are used as an aqueous solution or a solution in an organic solvent. can do.
Dyestuffs or pigments can also be added for coloring.

Examples 1-2 and Comparative Examples 1-3
In each of the examples and comparative examples, a serving having the following configuration was manufactured.
Example 1
Structure: Single blade structure Ultra high molecular weight polyethylene multifilament (weight average molecular weight 4 million, breaking strength 26 cN / dTex, breaking elongation 4%, initial elastic modulus 880 cN / dTex) [Dyneema SK60 (registered trademark)] (275 dTEX) 4 Eight strikes of polyester monofilament (manufactured by GG Corporation, breaking strength 8 cN / dTex, breaking elongation 17%) (27 dTex).

(Example 2)
Structure: Double blade structure Core: Polyester monofilament (110dTex)
Sheath: Four dynames SK60 (registered trademark) (220dTEX) and polyester monofilament (manufactured by YGK) (27dTex)

(Comparative Example 1)
Structure: Single blade structure Polyester multifilament (Toyobo Co., Ltd., breaking strength 6cN / dTex, breaking elongation 20%) (165dTex)

(Comparative Example 2)
Structure: Single blade structure Dyneema SK60 (registered trademark) (165dTex)

(Comparative Example 3)
Structure: Single blade structure Eight strikes of four Dyneema SK60 (165dTex) and four polyester multifilament (Toyobo) (165dTex)

The characteristics of each serving were measured and evaluated as follows.
・ Fineness
Measured according to JIS L 1013.
・ Breaking strength, breaking strength and breaking elongation
Measured according to JIS L 1013.
-Wear resistance Based on JIS L1095, the hexagon stick abrasion tester of a seat belt was improved, and the ceramic guide of 9 mm in diameter was arranged in the position of a hexagon stick, and it was used as a test machine. Measurement conditions such as stroke length and angle conformed to JIS D-4604 (1995).
That is, as shown in FIG. 3, a serving measurement sample is passed through a ceramic guide, one end thereof is fixed to a drum, and a load is applied to the other end. The load is 3.3% of the maximum strength value of the sample. The number of frictions until the fiber broke by the above measurement was evaluated as wear resistance.
Furthermore, as another evaluation of the wear resistance, the drum was reciprocated 1000 times, the serving was worn with a ceramic guide, and then the presence or absence of fluff in the worn portion was visually determined.
The results are shown in Table 1 below.

  From the above results, it can be seen that the servings of Examples 1 and 2 have good wear resistance.

(Example 5)
The bowstring serving braid produced in Example 1 was immersed in a 10% by weight solution of an ethylene-acrylic acid copolymer at 25 ° C. and dried in an oven at 120 ° C. to adhere the copolymer to the braid. . The adhesion amount of the ethylene-acrylic acid copolymer was 10.0% by weight based on the weight of the braid.

(Example 6)
Except that carbon black was added to the ethylene-acrylic acid copolymer solution in an amount of 2% by weight based on the weight of the solution, the braided cord was made of ethylene-acrylic acid copolymer and carbon black in the same manner as in Example 5. Was attached.

Examples 7-8 and Comparative Examples 4-5
In order to evaluate the anti-winding effect of the serving braid of the present invention, the following braid was manufactured, wound as a serving around both ends and the center of the bowstring, and after 1000 shots of arrows, the winding deviation was evaluated visually. .
(Example 7)
Structure: Single blade structure Dyneema SK60 (registered trademark) (275dTEX) and polyester monofilament (27dTex)

(Example 8)
Structure: Double blade structure Core: Polyester monofilament (110dTex)
Sheath: Eight strikes of Dyneema SK60 (registered trademark) (220dTEX) and polyester monofilament (27dTex)

(Comparative Example 4)
Structure: Single blade structure Dyneema SK60 165dTex

(Comparative Example 5)
Structure: Single blade structure Dyneema SK60 165dTex and polyester multifilament 165dTex

  In the braids of Examples 7 and 8, no winding deviation occurred even after 1000 shots, but in the braids of Comparative Examples 4 and 5, apparent winding deviation occurred and many gaps appeared.

It is a figure which shows a recurve bow. It is a figure which shows a compound bow. It is sectional drawing of an example of the braid of this invention. It is a schematic diagram of the testing machine used in order to evaluate abrasion resistance in an Example.

Explanation of symbols

1, 1 ': Both ends of a string, 2: A part that crosses an arrow, 11: High-strength multifilament, 12: Monofilament

Claims (5)

  A braid for serving a bowstring comprising a braid made of a plurality of filaments or a twisted yarn of a plurality of filaments, at least a part of which is a high-strength multifilament and the remaining filaments are monofilaments Or twisted yarn.   The serving string or twisted yarn of a bowstring according to claim 1, wherein the high-strength multifilament has a breaking strength of 15 cN / dTex or more, a breaking elongation of 7% or less, and an initial elastic modulus of 500 cN / dTex or more. The serving braid or twisted yarn for a bowstring according to claim 1 or 2, wherein the fineness is 1298 dTex or less.   The serving string or twisted yarn of a bowstring according to claim 1 or 2, wherein the high-strength multifilament is a polyolefin multifilament having a weight average molecular weight of 1 million or more.   The serving braid or twisted yarn of a bowstring according to claim 1 or 2, wherein the plurality of filaments are integrated with a heat-adhesive resin.

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