Racket string and manufacturing method thereof
A manufacturing method and string technology, applied in the field of racket strings, can solve problems such as easy changes in concentration or viscosity, uneven quality, etc., and achieve the effect of small tension loss and comfortable playing
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[0048] Hereinafter, it demonstrates concretely using an Example. In addition, this invention is not limited to a following Example. In the following examples, monofilaments and strings were evaluated by the following methods.
[0049]
[0050] Strength, knot strength, and elongation are based on the measuring method of JIS L1013. The diameter was measured five times while slightly rotating the monofilament using a micrometer, and the average value was defined as the diameter.
[0051]
[0052] In the case of badminton strings, one string is stretched with a tension of 20 lbs, and both ends are fixed with clamps (clamping interval is 30 cm). Use a pendulum-type hammer to hit the center of the string from a fixed position in such a way that it collides at right angles to the string in the horizontal direction, and measure the movement (displacement) of the string after the collision at l / 1000 second intervals and stress, use the following calculation method to obtain rigi...
Embodiment l～5
[0073] Strings for badminton were produced in the following steps.
[0074] (1) core wire
[0075] As the core wire, a filament yarn (melting point 260° C., number of constituents 342, total fineness 2340 decitex) of the trade name “Promilan” (nylon 66) produced by Toray Co., Ltd. was used, which was obtained by Z-twisting 200 times / m. .
[0076] (2) Hot-melt flat monofilament and winding process
[0077] Using low-melting point copolymerized nylon manufactured by Toray Co., trade name "CM8000" (melting point 137°C), it was produced by melt spinning such as figure 2 A flat monofilament in which five cross-sectional circles are connected like in A. The flatness L / D is about 5, L=0.165mm, D=0.035mm, and the fineness is 49 deci tex. One of these flat monofilaments was wound flat on the surface of the core wire under the conditions shown in Table 1 by varying the number of windings. The weight of the wound monofilament and the area coverage of the monofilament with respect t...
Embodiment 6
[0093] The same strings as in Example 4 were used up to the heat treatment process, and the strings were produced using a nylon 610 phenol solution as a surface resin processing liquid. Table 1 shows the product evaluation results. The product evaluation result was as good as Example 4.
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