KR102074081B1 - Fabric yarn pressure sensor and manufactruing method thereof - Google Patents

Abstract

Disclosed is a manufacturing method of a fiber yarn pressure sensor which implements a pressure sensor with a yarn itself used in fabric such as fabric or knitted fabric. The fiber yarn pressure sensor includes a second twisted yarn made by twisting two strands of a first twisted yarn, and an insulating yarn twisted by two strands of the second twisted yarn. The first twisted yarn has a shape in which a conductive yarn of a first conductive rate and a conductive yarn of a second conductive rate different from the first conductive rate are twisted.

Description

Fiber yarn pressure sensor and its manufacturing method {FABRIC YARN PRESSURE SENSOR AND MANUFACTRUING METHOD THEREOF}

Embodiment of the present invention relates to a pressure sensor, and more particularly to a fiber yarn pressure sensor and a method for manufacturing the fiber (yarn) that is used in the fabric, such as woven or knitted fabric itself as a pressure sensor.

The technology to implement the sensor using the functional fiber has been continuously studied. In general, a method of imparting functionality to the surface of the fiber by using a chemical method is used, but since expensive materials or low productivity methods are used, it has not been achieved until commercialization.

In addition, technology for expressing performance by making a fabric or knitted fabric using commercially available fibers is being studied, but a method of using a pressure-sensitive material in the form of a polymer film in a gap between a conductive fiber and a non-conductive fiber to use it as a pressure sensor. However, there is no use in the field of direct pressure measurement.

As such, most conventional pressure measuring techniques use a polymer film, and a technique for fiberizing them is currently unknown.

Patent Publication No. 10-2017-0028171 (2017.03.13)

The present invention as a result of the efforts to overcome the conventional limitations as described above is an object of the present invention is a fiber yarn pressure sensor and a method for manufacturing the yarn (yarn) itself used as a pressure sensor used in the fabric, such as woven or knitted fabric To provide.

Another object of the present invention, by expressing a laminated structure on one strand of the fiber yarn can be driven by a pressure sensor, the fiber can maintain the pressure sensor characteristics even when weaving by using the fiber yarn of the laminated structure, the fiber The present invention provides a pressure sensor and a method of manufacturing the same.

Fiber yarn pressure sensor according to an aspect of the present invention for solving the above technical problem, the second twist yarn made by twisting two strands of the first twist yarn; And an insulated yarn twisted with two strands of the second twisted yarn, wherein the first twisted yarn has a form in which a conductive yarn of a first conductivity and a conductive yarn of a second conductivity different from the first conductivity are twisted.

In one embodiment, the first twisted yarns are twisted in an S-twisted form, the second twisted yarns are twisted in a Z-twist form, and the second strands of the second twisted yarn and the insulated yarns are in an S-twist form. Twisted

In one embodiment, the first conductivity is greater than the second conductivity.

In one embodiment, the resistance per unit length of the two twisted yarns and the twisted yarn yarn or the third twist yarn is 10.0Ω to 30.0Ω, and the initial resistance restoring force is less than 1 second.

In one embodiment, the conductive yarn of the first conductivity and the conductive yarn of the second conductivity may be an electroless plated conductive yarn.

According to another aspect of the present invention, there is provided a method of manufacturing a fiber yarn pressure sensor, wherein a conductive yarn having a first conductivity and a conductive yarn having a second conductivity different from the first conductivity in an S-twisted form. Twisting to form a first twisted yarn; Twisting two strands of the first twisted yarn in a Z-twist form to form a second twisted yarn; And twisting the second twisted yarn two strands and the insulated yarn into an S-twist form.

In one embodiment, the method of manufacturing a fiber yarn pressure sensor, before forming the first twisted yarn, further comprising the step of forming the conductive yarn of the first conductivity and the conductive yarn of the second conductivity by electroless plating. Can be.

In the case of using the fiber yarn pressure sensor of the present invention and a method of manufacturing the same, the pressure sensor can be implemented at a yarn level, and thus, various applications can be made to products using fibers such as fabrics and knitted fabrics.

In addition, according to the present invention, it is possible to provide a flexible fibrous and resistive pressure sensor having characteristics of less than 20 Ω unit resistance of the yarn itself and less than 3 seconds of initial resistance restoration in the original fabric.

In addition, according to the present invention, a flexible fibrous and resistive pressure sensor can be produced simply by incorporating a conductive yarn and a fiber yarn (insulated yarn), and innovative design freedom and ease of operation or manufacturing convenience in various applications are achieved. It can be improved, and there is an advantage that can significantly lower the manufacturing cost.

 When using the fiber yarn provided as a result of the present invention, it is believed that it is possible to provide the optimum design freedom for applications requiring a flexible pressure sensor. In addition, the demand for flexible electronic components or sensors for wearables is continuously increasing, and the start of the world's wearables is expected to continue to grow. There have been no reports on the implementation of pressure sensors manufactured in the fiber yarn unit, and it is expected that various applications may be derived using the same.

1 is a view for explaining a fiber yarn pressure sensor according to an embodiment of the present invention.
FIG. 2 is a partial exemplary view of a conductive yarn that can be employed in the fiber yarn pressure sensor of FIG.
3 is a partial illustration of conductive yarns that can be employed in the fiber yarn pressure sensor of FIG.
Figure 4 is a flow chart for a method of manufacturing a fiber yarn pressure sensor according to another embodiment of the present invention.
5 is a view for explaining an evaluation process for the fiber yarn pressure sensor of the present embodiment.
6 is a view for explaining another evaluation process for the fiber yarn pressure sensor of the present embodiment.
7 is a view for explaining another evaluation process for the fiber yarn pressure sensor of the present embodiment.
8 is an exemplary view for explaining the fiber yarn pressure sensors of the comparative example generated in the process of deriving the fiber yarn pressure sensor of the present embodiment.

Specific structural or functional descriptions of the embodiments according to the inventive concept disclosed herein are provided only for the purpose of describing the embodiments according to the inventive concept. It may be embodied in various forms and is not limited to the embodiments described herein.

Embodiments according to the inventive concept may be variously modified and have various forms, so embodiments are illustrated in the drawings and described in detail herein. However, this is not intended to limit the embodiments in accordance with the concept of the present invention to the specific forms disclosed, it includes all changes, equivalents, or substitutes included in the spirit and scope of the present invention.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprise" or "having" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described herein, but one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof.

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

1 is a view for explaining a fiber yarn pressure sensor according to an embodiment of the present invention. FIG. 2 is a partial exemplary view of a conductive yarn that can be employed in the fiber yarn pressure sensor of FIG. 1. 3 is a partial exemplary view of conductive yarns that may be employed in the fiber yarn pressure sensor of FIG. 1.

The conventional flexible pressure sensor has a structure in which a polymer film is laminated in multiple layers, and a method of using a change in resistance or dielectric constant according to the application of pressure is used. The pressure sensor according to the present embodiment may be driven by a pressure sensor by expressing a laminated structure on one strand of fiber yarn, and may maintain pressure sensor characteristics even when weaving knitting using the result of a manufactured pressure-type pressure sensor. have. Therefore, there is no limitation on the application and design for applying the pressure sensor, and there is no limitation on the minimum size and shape.

In order to manufacture the fiber yarn provided in this embodiment, at least one conductive yarn should be included, and it is preferable to use an elastic yarn. Elastic yarns may be used, for example, elastic yarns generally made of polyurethane, and bulky nylon fibers may be used simultaneously.

There is no limitation on the kind of conductive yarn used, but it is advantageous to use yarn which is easy to twist in a twisted yarn process. In addition, in order to show a laminated structure with one strand of fiber yarn, it is preferable to simultaneously use a high-resistance yarn containing a carbon-based material.

Fiber yarns that can be employed in this embodiment are of two types, one of which is a fiber yarn having a structure avoiding the contact of the conductive yarn by using an insulated yarn, and the other is a laminated structure in which a high resistance yarn is mixed between the conductive yarns. It is a fiber yarn that implements.

The reason why two or more yarns are included in fabricating a structure avoiding contact between the conductive yarns is to obtain deformation recovery force in the axial direction and the vertical direction. Acts as.

In addition, the fiber yarn fabricated using the laminated structure is a deformation of the force applied to the yarn of high resistance acts as a principle of pressure detection, which is linear according to the force required to deform the volume of the yarn of high resistance. This is to take advantage of the linear change in internal resistance as it changes.

Thus, in the fiber yarn pressure sensor according to this embodiment, it was confirmed that the characteristics of the pressure sensor is expressed in the result of the knitting of both fibers, through which it was confirmed that it is easy to apply to various forms and applications.

Referring to the fiber yarn pressure sensor of the present embodiment described above in more detail, as shown in Figure 1, the fiber yarn pressure sensor 100 of the present embodiment, the first twisted yarn two strands (21, 22) The twisted yarn 2 includes twisted yarns 31, and the twisted yarns 2 strands 31 and 32 are insulated and twisted yarns 33 are included. There, the first twisted yarn 21 or 22 may have a form in which the twisted yarn 11 of the first conductivity and the twisted yarn 12 of the second conductivity different from the first conductivity are twisted.

Each of the first twisted yarns 21 and 22 may have a structure in which the first conductive yarns 11 and the second conductive yarns 12 are twisted. In addition, the first twisted yarns 21 and 22 may be made of a single material or a double material or may be a multifilament made of nanofibers.

Each of the first twisted yarns 21 and 22 is twisted in an S-twisted shape, each of the second twisted yarns 31 and 32 is twisted in a Z-twisted shape, and two strands of the second twisted yarns 31 and 32 are twisted. ) And the insulated yarn 33 may be twisted in an S-twist form. That is, the twisting direction of each of the second twisted yarns 31 and 32 and the twisting direction by adding the insulated yarn 33 in the fiber yarn pressure sensor 100 according to the present embodiment become opposite directions.

It is preferable that the first conductivity of the first conductive yarn 11 in each of the first twisted yarns 21 and 22 is greater than the second conductivity of the second conductive yarn 12. To this end, the first conductive yarn 11 and the second conductive yarn 12 may be formed by electroless plating. In addition, the first conductive yarn 11 and the second conductive yarn 12 may include different conductive materials. In that case, it was confirmed that the initial recovery time is shorter than when the first conductive yarn 11 and the second conductive yarn 12 contain the same conductive material or have the same conductivity.

In addition, as a result of the experiment, the resistance per unit length of the yarn twisted 2 strands 31, 32 and the insulated yarn 33 (hereinafter also referred to as 'third twist yarn') of the second twist yarn is 10.0Ω to 30.0Ω. The initial resistance restoring force was less than 1 second. These figures indicate that the fiber yarn pressure sensor can be used as a pressure sensor instead of the conventional pressure sensor with similar performance to the conventional pressure sensor.

2, the first conductive yarn 11, the second conductive yarn 12, the first twisted yarn 21 and 22, and the second twisted yarn 31 and 32 according to the present embodiment are insulated. At least one of the yarn 33 and the third twisted yarn 100 may be formed to have the first soft water L1 in a predetermined direction.

3, the first conductive yarn 11, the second conductive yarn 12, the first twisted yarns 21 and 22, and the second twisted yarns 31 and 32 according to the present embodiment are insulated. At least one of the yarn 33 and the third twisted yarn 100 may be formed to have the second soft water L2 in a predetermined direction.

Controlling the combination of the above-described first soft water L1 and its soft water direction, and the second soft water L2 and its soft water direction may affect the elasticity and initial resistance restoration time of the fiber yarn pressure sensor 100 to some extent. Can be. In one example, the first soft water may be 40% to 90% of the second soft water, the first soft water may be lowered, and the second soft water may be higher.

4 is a flowchart illustrating a method of manufacturing a fiber yarn pressure sensor according to another exemplary embodiment of the present invention.

Referring to FIG. 4, in the method for manufacturing the fiber yarn pressure sensor according to the present embodiment, before forming the first twisted yarn, the conductive yarn of the first conductivity and the conductive yarn of the second conductivity different from the first conductivity may be electroless plated. It may be formed (S40).

Then, in the method of manufacturing the fiber yarn pressure sensor, the first twisted yarn may be twisted in an S-twisted form with the first twisted conductive yarn and the second twisted conductive yarn (S41).

Next, two strands of the first twisted yarn may be twisted in a Z-twist form to form a second twisted yarn (S42). The second twisted yarn and the insulated yarn may be twisted in an S-twist form to manufacture a fiber yarn pressure sensor (S43).

In the above steps (S42 and S43) to insulate the twist direction and the second twisted yarn two strands forming a second twisted yarn with two strands of the first twisted yarn to effectively manufacture the pressure sensor using the prepared first twisted yarn The twist direction for forming the fiber yarn pressure sensor is different.

5 is a view for explaining an evaluation process for the fiber yarn pressure sensor of the present embodiment. 6 is a view for explaining another evaluation process for the fiber yarn pressure sensor of the present embodiment. 7 is a view for explaining another evaluation process for the fiber yarn pressure sensor of the present embodiment.

As shown in FIG. 5, the resistance and initial resistance restoration time of the fiber yarn pressure sensor 100 were measured using a jig (Zig, 150) manufactured for measurement.

In addition, as shown in FIG. 6, in the knitted fabric using a knitted fabric (plywood products used for knitting) 300 manufactured through a plywood using the manufactured fiber yarn pressure sensor 100 and another fiber yarn 200. The resistance of and the initial resistance recovery time were measured.

In addition, as shown in FIG. 7, the resistance and initial resistance restoration time were measured using the laminated structure 400 of two sheets. The measurement results are shown in Table 1 below.

As shown in Table 1, the resistance to the unit length of the fiber yarn pressure sensor itself was measured as 44.11 to 45.03Ω, and the initial resistance recovery time was measured to be less than 1 second. When the knit was measured directly, the unit length resistance was measured to be 66.00 to 68.00 ohms and the initial resistance recovery time was measured to be less than 3 seconds. In the case of using two knitted fabrics, the unit length resistance was measured to be 61.00 to 67.30Ω, and the initial resistance restoration time was measured to be less than 5 seconds.

Thus, it was confirmed that the fiber yarn pressure sensor according to the present embodiment has sufficient performance as a pressure sensor.

8 is an exemplary view for explaining the comparison of the fiber yarn pressure sensors of the comparative example generated in the process of deriving the fiber yarn pressure sensor of the present embodiment.

In this embodiment, the fiber yarn 100 of the present embodiment and the fiber yarns 101 to 107 of the comparative example are actual results manufactured using a weaving machine. In the present embodiment, the term 'fiber yarn' may correspond to 'twist yarn'.

Nos. 1 to 7 in Tables 2 and 3 below show the fiber yarns (FIG. 8 (a) to (g)) of the comparative example, and the number 8 shows the fiber yarn 100 of the present example.

In Tables 2 and 3, CY-8 is a Bekaert stainless steel conductive yarn, and refers to a conductive yarn with an average unit resistance of 2.16 Ω, and CY-18 is a separately manufactured spandex conductive yarn having a unit resistance. It refers to a conductive yarn of about 468.722Ω. The numbers in parentheses indicate the number of yarns, S denotes S-twist and Z denotes Z-twist, respectively.

In the present embodiment of Table 3, two strands of spandex are used as the first conductive yarn and one strand of CY-18 is used as the second conductive yarn to form the first twisted yarn, but the present invention is not limited thereto. A similar effect can be obtained when used.

As shown in Table 2 and Table 3, the fiber yarn pressure sensor according to the present embodiment is to prepare the first twisted yarn with the first conductive yarn and the second conductive yarn, and the second twisted yarn in the opposite direction to the twisted two strands 2 twisted yarn 2 strands and insulated yarn can be twisted to manufacture a fiber yarn pressure sensor.

The above-mentioned spandex is a fiber having the highest value in the textile industry and refers to a fiber called 'semiconductor of fiber'. Spandex is mainly composed of polyurethane, a petroleum compound, and has about three times the strength of conventional rubber bands. It can be stretched 5 to 8 times its original length, and is lighter than rubber and maintains its original elasticity. It is mainly used in women's underwear, swimwear, stockings, baby paper diapers, and the demand is increasing rapidly. It was commercialized by DuPont in 1959 and started production in 1962. In 1979, Taekwang Industrial Co., Ltd. introduced the technology of Japan's Toyobo and started producing it for the first time in Korea.

In this embodiment, a yarn for a multi-twisted pressure sensor may be manufactured by using an electroless plating conductive yarn. This fiber yarn pressure sensor can be applied immediately by changing the fiber type to various applications that have problems in applying resistance type pressure sensors, film types, and fiber types. Can be used, there is an advantage that can be used immediately without chemical treatment.

In particular, since a single strand of fiber can act as a pressure sensor, there is an advantage that the driving circuit can be easily installed and can be directly driven.

In addition, since the fiber yarn pressure sensor according to the present embodiment is in the form of a thread, there is almost no particular limitation in the field of use. Conventional flexible pressure sensor is a laminated structure of a polymer film is difficult to form the desired shape, so there is a limitation in the application and design for applying this, the fiber yarn pressure sensor of this embodiment is a pressure sensor using a single strand Since it is implemented, it can be effectively used in various industrial sites to collect user information. In addition, the information related to the pressure in the medical industry is very important, in this regard, the fiber yarn pressure sensor of the present embodiment can be used substantially without limitation.

The embodiments described so far are merely illustrative of the preferred embodiments of the present invention, and the scope of the present invention is not limited to the described embodiments, and those skilled in the art within the technical spirit and claims of the present invention. Various changes, modifications, or substitutions may be made thereto and such embodiments are to be understood as being within the scope of the present invention.

Claims (8)

A first twisted yarn made by twisting one or two strands of spandex conductive yarn of a first conductivity and one strand of stainless conductive yarn of a second conductivity in a S-twisted form;
A second twist yarn made by twisting two strands of the first twist yarn into a Z-twist form; And
Two strands of the second twisted yarn and the insulated yarn twisted in an S-twist form have a multi-twisted one-yarn having a resistance of 10.0Ω to 30.0Ω per unit length, and initial resistance restoring force is 1 second. It is less than the fiber yarn pressure sensor. delete delete The method according to claim 1,
And said first conductivity is greater than said second conductivity. delete The method according to claim 1,
The fiber yarn pressure sensor of the said 1st electroconductive yarn and the 2nd electroconductive yarn are electroplating conductive yarns. Forming a spandex conductive yarn of a first conductivity and a stainless conductive yarn of a second conductivity smaller than the first conductivity by electroless plating;
Forming a first twisted yarn by twisting one or two strands of the conductive yarn of the first conductivity and one strand of the conductive yarn of the second conductivity in an S-twisted form;
Twisting two strands of the first twisted yarn in a Z-twist form to form a second twisted yarn; And
Fabrication of the fiber yarn pressure sensor comprising the step of twisting the second twisted yarn and the insulated yarn in the form of S-twist to form a multi-twisted single strand (yarn) Way. The method according to claim 7,
The yarn has a resistance per unit length of 10.0 Ω to 30.0 Ω, and the initial resistance restoring force is a method of manufacturing a fiber yarn pressure sensor, characterized in that less than 1 second.

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