JPH0253534B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical Field] The present invention relates to strings used for rackets such as tennis, fishing, musical instruments, and the like. [Background Art] Conventionally, regarding the structure of this type of string, for example, Guttu products, there is no known material regarding the relationship between the breaking elongation between the core thread and the winding thread in the process of surrounding the winding thread with the core thread. In addition, no special attention is paid to the elongation of the raw yarn and the finished product, and in the conventional method, the core yarn and the winding yarn are used with the same elongation, and only the linear strength of the finished product is pursued. It was on. Therefore, at present, only threads with strong linear strength are used for both core threads and winding threads, ignoring their elongation. Generally, the physical properties of synthetic polymer fibers are as shown in FIG. 3, and if the molecular orientation is increased by stretching, the linear break strength increases, but the linear break elongation decreases. Guttu manufactured using yarn with greatly increased molecular orientation has a low finished elongation at straight break, so even if it has strength at straight break, it has little strength at knot break, and its dispersion is low. It's also big. Also, if the knot breaking strength/linear breaking strength is less than 60%, the gut will not be well-balanced. In other words, not only is the nodule breaking strength low, but also the variation in the strength is large, and abnormal values are always found here and there. Further, as described above, if the linear break elongation is decreased, the linear break strength is improved, but on the other hand, the molecules become highly oriented, which causes the fibers to become brittle and the knot break strength to decrease. Due to its structure, Gatsuto surrounds the core thread with a winding thread, but when drawing concentric circles at the knot, the circumference of the winding thread is larger than that of the core thread in the center. In this case, if the elongation of the core yarn and the winding yarn are approximately the same, naturally, a larger elongation stress is applied to the winding yarn with a larger winding radius, and the winding yarn breaks first. Therefore, the core yarn and the winding yarn do not exhibit strength at the same time, but exhibit strength separately, and the strength of the string as a whole decreases. [Purpose of the Invention] This invention focuses on the fact that in a string whose core thread is surrounded by wound threads, if the knot breaking strength/linear breaking strength becomes 60% or more, the variation in knot breaking strength becomes small and it becomes difficult to break. To provide a string in which the linear breaking elongation of the winding yarn is greater than that of the core yarn so that stress is not applied to the winding yarn at the knotted portion, and the strength of the knotting is increased. [Disclosure of the Invention] In order to achieve the above object, the string of the present invention has the following features:
A string made by using a core thread and a winding thread made of synthetic fiber monofilament of the same or different materials, and winding the winding thread around the core thread. 1.2 times larger than
If the thread is wound twice, the linear breaking elongation of the upper thread should be equal to or higher than the linear breaking elongation of the lower thread, and the standard deviation of the knot breaking strength should be 5% of the average value of the knot breaking strength. It is characterized by having a knot breaking strength/straight breaking strength of 60% or more. Hereinafter, this invention will be explained in detail based on the drawings showing one embodiment of the invention. FIG. 1 shows a partially cut-out string of the invention. Winding thread, that is, lower winding thread 2,
The upper winding thread 3 is wound, and the threads 1, 2, and 3 are
All of them are made of monofilaments made of the same or different synthetic fibers such as polyamide fibers and polyester fibers. The linear breaking elongation of these core threads 1, lower winding threads 2, and upper winding threads 3 is as follows: core thread < lower winding thread < upper winding thread, or core thread < lower winding thread = upper winding thread, and in the former case, core thread The elongation of the core yarn / the elongation of the lower yarn = 1/1.2 to 1/1.5, and the elongation of the core yarn / the elongation of the upper yarn = 1/1.4 to 1/2.0, and in the latter case, the elongation of the core yarn Elongation/Elongation of lower yarn and upper yarn = 1/1.6 to 1/2.2. The thread may be wound once. The standard deviation σ of the knot breaking strength of the gut (string) is
It is formed so that the knot breaking strength is within 5% of the average value. The above-mentioned monofilament made of different materials is a synthetic polymer fiber, and one example is a case where the core yarn is polyamide and the winding yarn is polyester. Note that bundled yarns of aramid fibers are also considered to be the same as monofilaments. FIG. 3 shows the relationships when the strings are knotted as shown in FIG. 2. In the figure, the relationship between the degree of orientation and strength of a monofilament (for example, polyamide) is that as the stretching ratio increases and the orientation increases, the straight-line breaking strength increases, but the nodular breaking strength shows a yield point at a certain point, and then decreases. do. Regarding the relationship between the stretching ratio and the linear wave elongation, as the stretching ratio increases, the elongation decreases. Next, the physical properties of guts obtained by setting various conditions of the raw yarn used as shown in Tables 1 to 4 will be described in more detail, with the physical properties of guts obtained being shown in these tables.

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【table】

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〔Effect of the invention〕

According to this invention, by increasing the linear breaking elongation of the upper winding thread and the lower winding thread to 1.2 times or more of the linear breaking elongation of the core thread, the winding thread can be easily moved around the core thread at the knot. It is possible to elongate the yarn to a greater extent than that of the yarn, and there is no need to apply large elongation stress or strain only to the winding yarn, and both the core yarn and the winding yarn effectively bear the knot-breaking strength jointly. Therefore, the knot breaking strength of the entire string is no longer limited to the breaking strength of the winding yarn, which weakens it or increases the variation, as in the past, and the knot breaking strength of the entire string is greatly increased. can be done. Therefore, for example, when this string is used as a gutt, it has an appropriate elongation, which gives a good feel at impact, and the strength is evenly balanced, making it possible to provide a durable gutt economically. . Furthermore, when used as fishing lines or strings for musical instruments, it is possible to exhibit good performance by having appropriate elongation and breaking strength.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; Fig. 1 is a partially cutaway perspective view thereof, Fig. 2 is a front view showing an example of knotting, and Fig. 3 is a diagram showing the relationship between the degree of orientation and strength of the monofilament. be. 1... core thread, 2... lower winding thread, 3... upper winding thread.

Claims (1)

[Claims] 1. A string made by using a core thread and a winding thread made of synthetic resin monofilament made of the same or different materials, and winding the winding thread around the core thread, and the straight-line break elongation of the winding thread is expressed as the straight-line break elongation of the core thread. If the thread is wound twice, the linear breaking elongation of the upper thread is equal to or greater than the linear breaking elongation of the lower thread, and the standard deviation of the knot breaking strength of the string is A string characterized in that the knot breaking strength is within 5% of the average value, and the knot breaking strength/straight breaking strength is 60% or more.