KR102136257B1 - A Electrically- Conductive Elastic Textile Band Capable of Transmitting Electrical Signal without distortion - Google Patents

Abstract

The present invention relates to an elastic electrically conductive fabric band for transmitting electrical signals by interconnecting wearable smart devices, which has little change in resistance according to stretching even if the elastic electrically conductive fabric is stretched in one direction, thereby being able to accurately transmit electrical signals without distortion.

Description

A Electrically-Conductive Elastic Textile Band Capable of Transmitting Electrical Signal without distortion}

The present invention relates to an electrically conductive fabric band that transmits an electrical signal by interconnecting wearable smart devices, and more specifically, stretchable electricity capable of accurately transmitting an electrical signal without distortion due to little change in resistance due to elongation even when elongated in one direction. It is about a conductive fabric band.

With the development of information and communication technology, research on wearable smart devices worn by users has been actively conducted.

A wearable smart device is an electronic device that can be attached to a body or an object and is connected to an external computer to collect and analyze information. It is attached to a portable device, such as clothing, watches, bracelets, and glasses, and the heart or body temperature attached to the skin. 2. Description of the Related Art An attachable device, which is a patch type measuring device, and an implantable device that can be implanted into a body are being developed.

The wearable smart device is connected with a conductive line to communicate electrical signals between mutual devices or external computers for information collection or analysis. Conventionally, a cable-type conductive wire was used, but the cable-type conductive wire was very inconvenient to use, such as poor fit and being removed during washing. To solve this problem, technology has been developed to apply a conductive yarn and fibers that can be worn comfortably and can be washed while having electrical conductivity at the same time.

As an example of this, Korean Patent Publication No. 10-2010-0012593 discloses a fabric in which an evangelist is formed in an embroidery form on a non-conductive fabric. However, such an embroidery method has a problem in that productivity is reduced as a separate design and pattern are produced for each product.

In addition, Korean Patent Publication No. 10-2018-0069287 discloses a conductive fabric in which an evangelist is woven with a weft or a slope, which is superior in productivity compared to the above-mentioned embroidery method, and has a crimp formed in the evangelist, so that the user's movement It has the advantage that it can be freely stretched.

However, when such a conductive fabric is used in a wearable smart device, it can be freely stretched to the wearer's body movement to provide the wearer's convenience.

Therefore, noise is generated in the electric signal transmitted as the resistance change occurs according to the wearer's body movement, and thus there is a limit to accurately transmit a minute electric signal such as a biological signal.

Republic of Korea Patent Publication No. 10-2010-0012593 (Invention name: electric conductive metal composite investigation and embroidery circuit using the same) Republic of Korea Patent Publication No. 10-2018-0069287 (Invention name: stretchy conductive fabric)

The present invention was created to solve the problems of the prior art, and the object of the present invention is to minimize the change in resistance due to elongation even when connected to a wearable smart device and elongate in one direction. The present invention is to provide a stretchable electrically conductive fabric band.

In order to solve the above technical problem, the present invention can arrange the stretch yarn and the conductive yarn in a first direction fiber, and then transmit the electrical signal in the extending direction of the stretch yarn by orthogonal to the second direction fiber, respectively. Since the conductive yarns are arranged in the free space formed by forming the thicker stretch yarns orthogonal to the second direction fibers, the conductive yarns can be stretched without changing the path length without receiving loads or external forces, and the resistance change according to the stretching. It provides a flexible electroconductive fabric band that can minimize the.

In addition, the free space of the present invention is formed between the elastic yarns arranged along the first direction.

In addition, the free space of the present invention is formed by elastic yarns protruding above and below the second direction fibers.

In addition, the conductive yarn of the present invention is stretched in the first direction within the free space by the height difference formed by the conductive yarn before and after the stretching of the new construction yarn.

In addition, the single or plural conductive yarns of the present invention are arranged alternately along the first direction with one or more of the telescopic yarns.

In addition, the fineness ratio of the evangelist and the new yarn of the present invention is 1:4 to 8.

In addition, the electrical conductive fabric band of the present invention has a resistance change rate of 3% or less according to elongation in the first direction.

In addition, the electrical conductive fabric band of the present invention has a resistance change rate of 3% or less when elongated to 80% or less in the first direction.

The stretchable electrical conductive fabric band according to the present invention can transmit an electrical signal in a direction in which it is stretched as the first and second yarns, which are orthogonal to the second direction fiber, and when the stretcher is stretched, the stretched yarn is thick In the free space, the resistance change can be minimized as the evacuator is stretched without changing the length of the path without receiving load or external force due to elongation. You can send it to the device.

1 is a plan view of an electrically conductive fabric band according to the present invention.
2 is a cross-sectional view in a first direction before and after stretching of the electrically conductive fabric band according to the present invention.
3 is a view showing a change in the shape of the conductive yarn before and after stretching of the electrically conductive fabric band according to the present invention.
4 is a photograph of an electrically conductive fabric band according to an embodiment of the present invention.
5 is a photograph showing an experiment of measuring the rate of change of resistance according to elongation of Examples and Comparative Examples according to the present invention.
6 is a graph showing a comparison of resistance change rates according to elongation of Examples and Comparative Examples measured according to the experiment of FIG. 5.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

This embodiment is provided to more fully explain the present invention to those of ordinary skill in the art, the shape of the elements in the drawings, the size of the elements, the spacing between the elements, etc. to emphasize a more clear description For this, it may be exaggerated or reduced.

In addition, when it is determined that the technical features of the present invention may unnecessarily obscure the technical features of the present invention, as a matter of ordinary skill in the art, such as a known function or a known configuration in principle in describing the embodiments, the detailed description thereof. The description will be omitted.

The term'fiber' in the present invention means a natural thin or thin linear polymer object that can be bent long, thin, and the term'elongation' means a ratio between a stretched length and an original length (unit: %) ).

In addition, in the present invention, the term'first direction fiber' refers to a fiber that is arranged in a direction in which the length is elongated, and refers to warp or weft, and'second direction fiber' is a fiber that is orthogonal to'first direction fiber'. It means slope.

The electrically conductive fabric band according to the present invention is a conductive line used to electrically connect an electronic device such as a sensor embedded in smart clothing, an electronic device such as a display or terminal, and a power supply unit driving a sensor or electronic device.

1 is a plan view of an electrically conductive fabric band 10 according to the present invention. Referring to FIG. 1, the electroconductive fabric band 10 according to the present invention is formed in a band shape having a predetermined length, so that the first direction fiber 20 and the first direction fiber 20 have a comfortable fit and flexibility. It is made of a second direction fibers 30 orthogonal to.

The first direction fiber 20 is made of a stretchable yarn 21 having elasticity and a conductive yarn 22 having electrical conductivity, and is orthogonal to the second direction fiber 30, respectively. Here, as the telescopic yarn 21 and the conductive yarn 22 are arranged in the same first direction, they are freely extended by the telescopic yarn 21 according to the user's movement in the first direction in which the electrical signal is transmitted.

In addition, the new yarn 21 extends the electrically conductive fabric band 10 in the first direction, and forms a free space S in the first direction in which the conductive yarns 22 are arranged. 21) as shown in Figure 1 is formed in a coarse fineness compared to the conductor 22, which will be described later. As the new yarn 21, a single fiber or a composite fiber of polyurethane, polyurethane, SBS (styrene-butadiene-styrene), SBR (styrene butadiene rubber), PDMS (polydimethylsiloxane), or silicon may be used.

The conductive yarns 22 are fibers having electrical conductivity and are alternately arranged with the stretchable yarns 21 along the first direction. In FIG. 1, an example in which the conducting conductor 22 and the stretching yarn 21 are alternately arranged in 1:1 is shown, but the conducting conductor 22 is in the first direction depending on the size of the electric signal to be transmitted or the environment of the connected electronic device. It can be arranged in a variety of densities, a single or a plurality of conductors 22 may be arranged alternately in the first direction with one or more telescopic yarns (21).

As described above, the conduction conductors 22 arranged alternately with the new construction yarns 21 can be freely constructed and expanded by the adjacent new construction yarns 21, as well as the margin formed by the new construction yarns 21 as shown in FIG. The conductors 22 can be easily arranged into the space S. As the conductive yarn 22, metal nanoparticles or fibers coated with a conductive polymer may be used on the fiber surface. The coated fiber can be applied without limitation, and the metal nanoparticles can be gold (Au), silver (Ag), copper (Cu), nickel (Ni), etc., and the conductive polymer is carbon black, carbon nanotube ( CNT), silver nanowires, polyurethane, and the like can be used.

As the first direction fibers 20, the first direction fibers 20 that are interwoven with the stretched yarns 21 and the conductive yarns 22, respectively, may be a conventional synthetic fiber such as polyester yarn or nylon yarn. On the other hand, in the electroconductive fabric band 10 shown in FIG. 1, an example in which the first direction fibers 20 and the first direction fibers 20 are interwoven with plain weave is shown, but the present invention is not limited thereto, and the twill, runner weave Or they may be woven into their changing organization.

2 is a cross-sectional view in the first direction before and after stretching of the electrically conductive fabric band 10 according to the present invention, and FIGS. 2(a) and 2(b) are cross-sectional views before and after stretching, respectively. Referring to FIG. 2(a), as the stretched yarn 21 having a fine fineness is arranged to intersect with the first direction fiber 20 to protrude above and below the first direction fiber 20, FIGS. As described above, a free space S is formed between the newly stretched yarns 21 arranged in the first direction, and the conductive yarns 22 having finer fineness than the new stretched yarn 21 are arranged in the free space S.

That is, the stretched yarn 21 orthogonal to the upper and lower portions of the first direction fiber 20 protrudes as much as its thickness, and the conductive yarn 22 having a finer grain than the stretched yarn 21 is parallel to the stretched yarn 21. As orthogonal to the first direction fiber 20, the clearance between the conductive yarn 22 and the first direction fiber 20 as shown in FIG. 2(a) is equal to the difference in the fineness of the elastic yarn 21 and the conductive yarn 22. (S) is formed.

Here, in order to form the free space S by the new house 21, the fineness ratio of the evangelist 22 and the new house 21 is preferably 1:4-8, and the fineness of the new house 21 If less than 1:4, the free space (S) is small, the elongation rate of the new yarn 21 increases, and resistance changes occur. When the fineness of the new yarn 21 exceeds 1:8, the free space (S) is too large. Since it is formed, it is difficult for the conductive yarn 22 and the first direction fiber 20 to be woven. In addition, the fineness ratio of the conductive yarn 22 and the first direction fiber 20 is preferably 1:1 to 4, and if the fineness of the second direction fiber 30 is less than 1:1, the first direction fiber 20 And it is difficult to weave, and when the fineness of the second direction fiber 30 exceeds 1:4, a resistance change occurs by pressing the conductive wire 22 during stretching.

The state in which the electrically conductive fabric band 10 is stretched is illustrated in FIG. 2(b). Referring to this, when the stretchable yarn 21 is stretched in the first direction, the thickness of the stretchable yarn 21 is reduced (D ₁ →D ₂ ), the vertical height of the conductive yarn 21 decreases as much as the thickness reduction width (D ₁ -D ₂ ) of the stretched yarn 21 and extends in the first direction.

3(a) and 3(b) show changes in the shape of the conductive yarns 22 before and after the stretching of the electrically conductive fabric band 10 extended as described above. Referring to this, the distance is extended along the first direction within the free space S by the height difference (H ₁ → H ₂ ) of the conducting conductor 22 when the new yarn 21 is extended (height length: H _1- H ₂ ), the path length (C) of the pre- and post-stretching conductors 22 is the same, and the extension 22 is disposed in the free space S when the extension yarns 22 are stretched. Since there is no change in cross-sectional area due to no load or external force due to elongation, resistance change before and after elongation hardly occurs.

Examples and comparative examples of the present invention made as described above will be described below.

<Example 1>

On the outer surface of the polyurethane, which is the screening screen, a nylon yarn was covered on the outer surface, and a silver yarn (Ag) nano-powder was coated on the surface of the nylon yarn, and a conductive yarn having a fineness of 70 denier was prepared on a slope. Then, a polyester yarn having a fineness of 150 denier as a weft yarn was prepared, alternately stretching and twisting the yarn one by one in an oblique direction to interweave with the weft yarn, forming both sides of the weft yarn, and weaving with only the new yarn and weft yarn in the center to produce a length as shown in FIG. 4. An electrically conductive fabric band with a width of 20 cm and a width of 5 cm was prepared.

<Example 2>

The fineness of the newly constructed yarn was prepared in the same manner as in Example 1 except that 350 denier was used.

<Comparative Example 1>

The fineness of the newly constructed yarn was prepared in the same manner as in Example 1 except that 200 denier was used.

<Comparative Example 2>

The fineness of the newly constructed yarn was prepared in the same manner as in Example 1, except that 70 denier was used in the same manner as the conducting yarn.

<Comparative Example 3>

Weft yarns were prepared in the same manner as in Example 1, except that a fineness of 350 denier was used.

The rate of change of resistance according to elongation of Examples 1 and 2 and Comparative Examples 1 to 3 thus prepared was measured as follows.

<Experiment 1: Measurement of resistance change rate according to elongation>

5, after fixing both sides of Examples 1 and 2 and Comparative Examples 1 to 3 with clamps 40, along the inclined direction to 10%, 25%, 50%, 75%, 80% Each was stretched to measure the rate of resistance change before and after stretching, and the measured results are shown in Table 1 and FIG. 6 below.

※ Resistance change rate according to elongation (%) = (resistance value after elongation in the inclined direction-resistance value before elongation) / (resistance value before elongation) × 100.

Category/Elongation 10% 25% 50% 75% 80% Example 1 0.1% 0.4% 1.1% 1.8% 2.3% Example 2 0.2% 0.8% 1.8% 2.4% 3.0% Comparative Example 1 1.8% 4.5% 11% 24% 32% Comparative Example 2 5% 22% 45% 66% 73% Comparative Example 3 1.5% 3.9% 10% 22% 29%

As shown in Table 1 and FIG. 6, Example 1 and Example 2, while the rate of change of resistance is very low from 0.1% to 3.0% until the elongation is elongated from 10% to 80%, the fineness of the stretch yarn is different from that of the Example. Examples 1 and 2 were rapidly changed more than 10 times as compared with the resistance change rates of the examples. In particular, in the comparative example 2 having the same fineness as the stretched yarn and the conductive yarn, the resistance change rate was changed up to 73%. In addition, in Comparative Example 3 in which the fineness of Examples 1 and 2 and the weft yarns differed, the resistance change rate was slightly lower than that of Comparative Example 1 and 2, but a large difference from Example 1 and 2 was confirmed.

Through this experiment, it was found that the fineness difference between the stretched yarn and the weft yarn arranged in the same direction as the conductive yarn 22 greatly influences the rate of change of resistance. In this case, when the elongated yarn 21 is stretched in an inclined direction without being subjected to a load or external force due to the elongation of the elongated yarn 21, the conductive wire 22 disposed in the free space S formed by the elongated yarn 21 having a fine fineness during elongation is stretched. , It is judged that the cross-sectional area and path length (C) of the after-conducting yarn 22 are almost the same, so that there is little resistance change.

As described above, the electrical conductive fabric band 10 according to the present invention can transmit electrical signals in the extending direction as the stretchable yarn 21 and the conductive yarn 22 are arranged in the same direction, and can minimize the change in resistance during stretching. , It is possible to transmit minute electric signals to electronic devices that are connected accurately without noise.

The present invention described above is not limited to the described embodiments, and it is obvious to those skilled in the art that various modifications and modifications can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or modifications will have to belong to the claims of the present invention.

10: electroconductive fabric band 20: first direction fiber
21: New Construction 22: Missionary
30: second direction fiber 40: clamp
S: Free space D ₁ : Width of new yarn before stretching
D ₂ : Thickness of the stretched yarn after stretching H ₁ : Height of the conductive wire before stretching
H ₂ : Height of the conductor after stretching C: Path length of the conductor

Claims (8)

In the electroconductive fabric band orthogonal to the first direction fiber and the second direction fiber,
The first fiber is composed of a stretched yarn that is elongated and a conductive yarn having electrical conductivity, and is orthogonal to the second fiber vertically, and a stretch yarn having a finer grain than the conductive fiber is orthogonal to the second fiber, and thus follows the first direction. The conductive yarns are arranged in the free space formed between the arrangements, and the conductive yarns are extended in the first direction in the free space formed between the new and extended yarns by a height difference formed by the before and after extensions of the new and extended yarns. Stretch electric conductive fabric band. delete According to claim 1,
The free space,
A stretchable electrically conductive fabric band formed by the elastic yarn protruding above and below the second direction fibers. delete According to claim 1,
A stretchable electrically conductive fabric band, characterized in that the single or a plurality of the conductive yarns are alternately arranged along the first direction with one or more of the stretched yarns. According to claim 1,
The fineness ratio of the conductive yarn and the stretched yarn is 1:4 to 8, stretchable electric conductive fabric band. According to claim 1,
The electrical conductive fabric band is a stretchable electrical conductive fabric band, characterized in that the resistance change rate according to elongation in the first direction is 3% or less. The method of claim 6,
A stretchable electrical conductive fabric band characterized in that the resistance change rate is 3% or less when the electrical conductive fabric band is stretched to 80% or less in the first direction.

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