Sensing fiber member
Provided is a sensing fiber member which can be processed in long lengths, which excels in mass production, which is supple and has an excellent texture, and which is much less costly than a contact sensing fiber member (a piezoelectric yarn) for which a conventional piezoelectric material is used. This sensing fiber member has at least two covering yarns for which covering is achieved by wrapping an insulating fiber serving as a covering material in one direction around a linear conductor constituting a core material, two of the covering yarns being arranged close to each other. The sensing fiber member is characterized by reading changes in resistance and/or changes in capacitance between the linear conductors of the two covering yarns arranged close to each other.
1 . A sensing fiber member, comprising:
a first covered yarn; and
a second covered yarn,
wherein each of the first covered yarn and the second covered yarn includes:
a core material,
a first covering yarn, and
a second covering yarn,
wherein the core material is a linear electroconductive conductor,
wherein the first covering yarn and the second covering yarn are each a low electrical conductivity yarn that includes multifilament yarns,
wherein the low electrical conductivity yarn has an electric resistivity of 10 4 Ω·m to 5×10 9 Ω·m,
wherein, in the first covered yarn and in the second covered yarn, the first covering yarn and the second covering yarn are wrapped around the core material and a wrapping direction of the first covering yarn and of the second covering yarn is the same,
wherein the first covered yarn and the second covered yarn are plied to form a plied yarn in which the first covered yarn and the second covered yarn are mutually adjacent with the first covered yarn and the second covered yarn having crossing contact points,
wherein, in the plied yarn, the first covered yarn and the second covered yarn are twisted in a twisting direction that is opposite from the wrapping direction of the first covering yarn and the second covering yarn,
wherein each of the first covered yarn and the second covered yarn has a twist coefficient K, represented by the following formula:
twist coefficient K =( SS+SC ) 1/2 ×R is 7000 to 30,000,
where SS is a fineness (dtex) of the linear electroconductive conductor, SC is a total fineness (dtex) of the low electrical conductivity yarn, and R is a wrapping number of the low electrical conductivity yarn, whereby the wrapping number means a number of twists per meter, and
wherein the sensing fiber member is configured to detect a change in electrical resistance between the linear electroconductive conductors of the first covered yarn and the second covered yarn.
2 . The sensing fiber member according to claim 1 , wherein an applied force or an applied load on the sensing fiber member results in the change in electrical resistance between the linear electroconductive conductors of the first covered yarn and the second covered yarn.
3 . The sensing fiber member according to claim 1 , wherein an applied load on the sensing fiber member results in the change in electrical resistance between the linear electroconductive conductors of the first covered yarn and the second covered yarn.
4 . The sensing fiber member according to claim 1 , wherein a deformation of the sensing fiber member results in the change in electrical resistance between the linear electroconductive conductors of the first covered yarn and the second covered yarn.
5 . The sensing fiber member according to claim 4 , wherein the deformation is stretching.
6 . The sensing fiber member according to claim 4 , wherein the deformation is bending.
7 . The sensing fiber member according to claim 1 , wherein contact with a liquid results in the change in electrical resistance between the linear electroconductive conductors of the first covered yarn and the second covered yarn.
8 . The sensing fiber member according to claim 1 , wherein a change in humidity results in the change in electrical resistance between the linear electroconductive conductors of the first covered yarn and the second covered yarn.
9 . The sensing fiber member according to claim 1 , wherein the linear electroconductive conductor is metal fibers.
10 . The sensing fiber member according to claim 1 , wherein the linear electroconductive conductor is fibers to which conductivity has been imparted.
11 . The sensing fiber member according to claim 1 , wherein the linear electroconductive conductor is carbon fibers.
12 . The sensing fiber member according to claim 1 , wherein a wrapping direction of the multifilament yarns of the first covering yarn is the same as a wrapping direction of the multifilament yarns of the second covering yarn.
13 . The sensing fiber member according to claim 1 , wherein electrical short circuiting between the core material of the first covered yarn and the core material of the second covered yarn is prevented by the first covering yarn and the second covering yarn on each of the first covered yarn and the second covered yarn.
14 . The sensing fiber member according to claim 1 , wherein the core material of the first covered yarn is covered by respective first covering yarn and second covering and the core material of the second covered yarn is covered by respective first covering yarn and the second covering yarn to prevent electrical short circuiting between the core material of the first covered yarn and the core material of the second covered yarn.
15 . The sensing fiber member according to claim 1 , wherein the core material of the first covered yarn is a first core material, the core material of the second covered yarn is a second core material, and the first core material and the second core material are the same material.
16 . The sensing fiber member according to claim 1 , wherein the first covering yarn and the second covering yarn are the same material.
17 . A woven fabric in which the sensing fiber member according to claim 1 is interwoven.
18 . A knitted fabric in which the sensing fiber member according to claim 1 is knitted.