KR100957644B1 - Method for fabricating flexible printed conductive fabric - Google Patents

Abstract

In order to achieve the above object, the present invention provides a method for producing a conductive fabric comprising a base layer, a conductive layer and an insulating layer, forming a conductive layer on top of the base layer formed of synthetic fibers, recycled fibers or natural fibers; And forming an insulating layer on the upper portion of the conductive layer to prevent damage to the conductive layer, wherein when a bent portion is formed in the conductive layer, the insulating layer is formed in a relatively wider shape than a linear circuit. It provides a method for producing a conductive fabric.

Smart clothing, conductive, printed circuit boards

Description

Method for fabricating a conductive fabric {Method for fabricating flexible printed conductive fabric}

The present invention relates to a method for manufacturing a conductive fabric, and more particularly, to a method for manufacturing a conductive fabric that can freely or arbitrarily form a conductive circuit pattern.

Smart Wear is a new product designed to use digital functions anytime and anywhere by applying new signal transmission fiber technology and embedding various digital devices in textile fashion products. In other words, it is a new type of clothing that is equipped with digital functions necessary for maintaining the properties of textiles or clothing in textile materials and clothing. For this reason, it must transmit digital signals while showing the feel and properties similar to that of ordinary fabrics. Thus, a new concept of clothing that combines the functionality of the materials (Hifunction materials properties) that the fibers or clothing itself senses external stimuli and responds to itself and the digitalized properties that the clothing and the fabric itself do not have.

Smart Wear, which has been developed for military use since the mid-1990s, is currently being actively developed in clothing and medical fields. In particular, smart materials using printing electronic technology may be used in various military textile products of a wearable computer. When printed electronic technology is used as an interconnection method for connecting various parts and conductive textile fabrics having the characteristics of clothing and electrical properties in smart materials, the application value is high because fabric-based electronic circuit design is possible. For example, if printed electronics are applied to military uniforms, there is a possibility of weight reduction and volume reduction, thereby enabling the development of military uniforms integrating the healing function and communication function. In modern warfare-oriented warfare, soldiers must carry more than 45kg of equipment when fully armed, so the development of this technology is urgently required. In order to manufacture such smart clothing, a technology that integrates various elements for a body area network (BAN) is required.

Various methods have been proposed for this purpose, for example, to form a fabric from an insulated wire, a metal yarn imparted with electrical conductivity, or an insulating spun yarn. In this method, the conductivity is determined by the number and size of the electrically conductive metal yarns or the spun yarns.

In the proposed method, the problem of attaching the insulated wire to the final garment is to add the step of attaching / insulating the insulated wire in the final process, resulting in the increase of the cost and also the continuous use of the wearer. Due to this, the insulated wire in the fiber is broken so that it does not exhibit its original function.

More specifically, in WO2004 / 107831, an electrically conductive fabric is proposed in which conductive fibers and non-conductive fibers are woven with each other, but the non-conductive fibers impart elasticity to the fabric and selectively impart elasticity to the fabric.

International Publication No. WO2003 / 095729 also discloses a multi-layer weft yarn for forming one or more cavities as a multilayer fabric having an electronic function therein; A multilayer comprising at least one conductive spun yarn having a portion thereof in one of a plurality of layers disposed between the inclined yarns and forming at least one cavity and at least one circuit carrier disposed in the cavity and electrically connected to at least one electrically conductive spun yarn Fabrics have been proposed.

On the other hand, the fabric that can be the basis of smart clothing may require the following dynamic wearability. First, as a reference to the physical aspects of the wearer and the device, the placement, the form language, the human movement, the wearer's human perception of intimate space, size variation), the attachment of the device (attachment).

Depending on the relationship between the wearer and the proximity environment, the device's composition, its weight, physical accessibility, sensory interaction, thermal comfort, and aesthetics Psychological aesthetics, long term effects, etc. Gemperle, F., Kasabach, C., Suvoric, J., Bauer, M., Martin, R. (1998) Design for wearability, Digest of papers 2nd International Symposium of wearable computer, IEEE computer Society

In this respect, the electrically conductive fabrics for the proposed smart clothing are difficult to be designed to correspond to the attachment position or form of the electronic device to be used. In other words, the countermeasure cannot be presented at all in terms of the criteria for the physical aspects of the wearer and the electronic device. In addition, in terms of maintaining the intrinsic properties of the fiber, the conventionally proposed methods, such as, for example, the limitation of the fiber volume, washability, has a problem that the limit is too large.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a method of manufacturing a conductive fabric capable of freely forming a circuit on a fabric without limiting dynamic wearability.

It is also an object of the present invention to provide a method for manufacturing a conductive fabric capable of free circuit design regardless of the form or attachment position of the electronic device.

It is also an object of the present invention to provide a method for manufacturing a conductive fabric without product defects or circuit breakage due to disconnection.

It is also an object of the present invention to provide a method for producing a conductive fabric that can satisfy both the electrical properties and the inherent properties of the fabric that can be used in clothing.

In addition, it is an object of the present invention to provide a conductive fabric and a method of manufacturing the same, in which the current of the circuit is deformed in the design of the circuit to the heating element so that a smooth current can flow.

It is also an object of the present invention to provide a method of manufacturing a conductive fabric is washable.

In order to achieve the above object, the present invention provides a method for producing a conductive fabric comprising a base layer, a conductive layer and an insulating layer, forming a conductive layer on top of the base layer formed of synthetic fibers, recycled fibers or natural fibers; And forming an insulating layer on the upper portion of the conductive layer to prevent damage to the conductive layer, wherein when a bent portion is formed in the conductive layer, the insulating layer is formed in a relatively wider shape than a linear circuit. It provides a method for producing a conductive fabric.

In addition, before forming the conductive layer, the method of manufacturing a conductive fabric further comprises the step of forming a primer layer for maintaining a uniform thickness of the conductive layer on top of the base layer.

In addition, the primer layer is provided with a water-repellent layer to provide a method for producing a conductive fabric, characterized in that formed as a multilayer structure.

In addition, before forming the conductive layer, further comprises a calendering step of smoothing the surface of the base layer, offsetting the voids of the base layer, and pressing the fabric of the base layer with a compression roller to compensate for the bend resistance It provides a method for producing a conductive fabric.

In addition, after the calendering step to selectively offset the pores of the conductive fabric, to provide insulation and washing resistance, bending resistance to provide a method for producing a conductive fabric, characterized in that it further comprises a waterproof / waterproof step do.

In addition, the primer layer provides a method for producing a conductive fabric, characterized in that formed by one or more selected from the group consisting of polyurethane resin, acrylic resin, and silicone resin.

In addition, the conductive layer provides a method for producing a conductive fabric, characterized in that formed by at least one selected from the group consisting of a conductive polymer, carbon (carbon), a metal material and a mixture of the material and the binder.

In addition, the conductive polymer provides a method for producing a conductive fabric, characterized in that at least one selected from the group consisting of polyaniline, polypyrrole and polythiophene.

In addition, the metal material and the binder forming the conductive layer provides a manufacturing method of the conductive fabric, characterized in that included in the weight ratio of 90:10 to 80:20.

In addition, the binder provides a method for producing a conductive fabric, characterized in that at least one selected from the group consisting of polyurethane resin, acrylic resin, silicone resin, melamine resin and epoxy resin.

In addition, the conductive layer provides a method for producing a conductive fabric, characterized in that formed to a thickness of 2 to 500㎛.

In addition, the thickness of the conductive layer provides a method for producing a conductive fabric, characterized in that 10 to 20㎛.

In addition, the width of the conductive layer provides a method for producing a conductive fabric, characterized in that 10 to 20mm.

In addition, the insulating layer is formed by coating, printing or laminating at least one selected from the group consisting of polyurethane resin, acrylic resin, silicone resin, polyester resin, PVC resin, and polytetrafluoroethylene (PTFE) resin. It provides a method for producing a conductive fabric characterized in that.

In addition, the insulating layer provides a method of manufacturing a conductive fabric, characterized in that the dry coating in the case of direct coating, hot melt-type dot or gravure method is formed in the case of lining.

In addition, the wide form provides a method for producing a conductive fabric, characterized in that the circular or oval.

In addition, the resistance value of the fabric provides a method for producing a conductive fabric, characterized in that 0.5 to 4 세탁 before and after washing.

As described above, the method of manufacturing the conductive fabric according to the embodiment of the present invention enables free pattern formation on the conductive layer. Therefore, it is possible to implement a conductive function while ensuring a variety of dynamic wearability.

In addition, the fabric and manufacturing method according to the present invention is possible to design the circuit regardless of bending or folding due to the elasticity and flexibility that is a characteristic of the fiber fabric, and there is an extremely low effect of circuit damage such as disconnection.

In addition, the fabric and manufacturing method according to the present invention has the advantage that can be produced by a continuous process.

In addition, the fabric and manufacturing method according to the present invention has the effect of retaining the electrical function capable of energizing, while retaining the function as a fabric (clothing), such as coatability, comfort, moisture-permeable waterproof, tensile strength.

In addition, the fabric and manufacturing method according to the present invention has a very large advantage that can be washed, and also has a durable durability.

In addition, the fabric and manufacturing method according to the present invention has a merit that the conductive layer can be maintained uniformly because of the presence of a primer layer, thereby allowing a constant current to be energized.

In addition, the fabric and manufacturing method according to the present invention has the effect of high bending resistance by forming the insulating layer made of a material compatible with the conductive layer.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in the drawings, the same components or parts denote the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

The terms " about ", " substantially ", etc. used to the extent that they are used herein are intended to be taken to mean an approximation to or in the numerical value of the manufacturing and material tolerances inherent in the meanings mentioned, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure.

As used herein, the term "fabric" is used to include all articles, nonwoven fabrics and fibrous webs produced by weaving or knitting.

Figure 1 shows a cross-sectional view of the fabric according to an embodiment of the present invention.

The conductive fabric 10 according to the present invention may be composed of a base layer 100, an optional primer layer 200, a conductive layer 300, and an insulating layer 400.

In the fabric according to the preferred embodiment of the present invention, the base layer 100 may be any type of woven fabric, knitted fabric, nonwoven fabric or fibrous web. It can be applied without limitation to the material and the forming method. For example, it may be made of synthetic fibers such as polyester / polyamide / polyurethane, cellulose regenerated fibers such as rayon / acetate, and natural fibers such as cotton / wool /.

The base layer 100 is microscopically very uneven in its surface and there are extremely many fine pores due to the gaps between the fibers. Therefore, in order to ensure the uniformity of the surface and to form a conductive layer to be described later to a uniform thickness, and to prevent the material forming the conductive layer from penetrating to the back of the base layer 100, a primer on the top of the base layer 100 Layer 200 may be formed. However, the primer layer may be selectively formed on the fabric and may be excluded according to the characteristics of the fabric.

The primer layer 200 may be one or more selected from the group consisting of polyurethane resins, acrylic resins, silicone resins, and the like.

Meanwhile, the primer layer 200 according to the present invention may be formed of a single layer made of the material, and may be formed in a multilayer structure together with a water repellent layer (not shown). The water repellent layer may be performed by a general water repellent method, and may be made of a fluorine or silicon material as a non-limiting example. When the water repellent layer is formed, it may be formed on the surface and / or the back surface on which the conductive layer is to be formed. In this case, there is an advantage that the resin component constituting the conductive layer can be prevented from seeping into the fabric in the manufacturing process.

The conductive layer 300 capable of conducting electricity may be formed on the primer layer 200. The conductive layer 300 may be formed in a pre-designed form and a specific forming method will be described later. The conductive layer 300 may be one or more selected from the group consisting of a conductive polymer, a carbon material such as carbon, silver, and a mixture of the material and the binder. Specifically, the conductive filler is dispersed in a vehicle. The cured film after printing refers to a material exhibiting conductivity, and is commonly used for LCD electrode printing, touch screen printing, conduction pattern printing of circuit boards, contact and pattern portion printing of thin film switch plates, and electromagnetic shielding. Non-limiting examples of the conductive fillers include conductive metals (silver, gold, platinum, palladium, copper, nickel, etc.), of which silver is preferable. Meanwhile, the conductive polymer may be one or more selected from the group consisting of polyaniline, polypyrrole, and polythiophene.

The thickness of the conductive layer 300 is preferably 2 to 500㎛, if less than the range has a problem that it is difficult to ensure the uniformity of the thickness of the conductive layer, if the range exceeds the resistance value is increased power consumption is increased there is a problem. More preferably, it may be 10 to 20 ㎛. In addition, the width of the conductive layer 300 is preferably about 10 to 20mm, but as the width of the conductive layer increases, the resistance value decreases, so that the current can be stably energized. In addition, there is a problem in coating properties. Meanwhile, the resistance value of the fabric according to the present invention is preferably maintained at 0.5 to 4 kV before and after washing, and the range below is difficult to be practically realized, and there is a problem in that the current flows stably when the range is exceeded.

Meanwhile, the binder may be one or more selected from the group consisting of a polyurethane resin, an acrylic resin, a silicone resin, a melamine resin, and an epoxy resin, and preferably, may be a water dispersible polyurethane resin.

An insulating layer 400 may be formed on the conductive layer 300. The insulating layer 400 is an insulating layer by coating, printing or laminating at least one selected from the group consisting of polyurethane resin, acrylic resin, silicone resin, polyester resin, PVC resin, and polytetrafluoroethylene (PTFE) resin. 400 may be formed. The insulating layer 400 may prevent damages such as cracks in the conductive layer, impart flexibility to the fabric, and may perform waterproofing or waterproofing.

Hereinafter will be described a method of manufacturing a conductive fabric according to an embodiment of the present invention. 2a and 2b is a process chart showing a method of manufacturing a conductive fabric according to the present invention.

As described above, when the fabric forming the base layer 100 is prepared, the fabric of the base layer is supplied between two pressing rollers in order to compensate for the disadvantages of surface irregularities in the case of the fabric or the knitted fabric. As a result, the surface of the base layer 100 may be smooth, the voids of the base layer 100 may be canceled, and the bending resistance may be compensated for. (Calendar step) This calendering step is selectively performed according to the characteristics of the fabric. It is a process that can be done.

  Fabrics having a base layer that has undergone the calendering step or not being calendered may form the primer layer 200 for more aggressive control of surface voids and thickness uniformity of the conductive layer 300. The primer layer 200 may be formed by a knife roller method, an over roll coating, a floating knife coating, or a knife over coating, laminating, printing, or gravure coating. (Primer layer forming step) As described above, the primer layer. Also optionally formed.

Meanwhile, in forming the primer layer, when the primer layer is formed as a multilayer structure by forming the water repellent layer as described above, the water repellent layer may be performed before or after the calendering step. The process diagram shown in FIG. 2A illustrates a step of forming a water repellent layer before the calendering step, and the process diagram shown in FIG. 2B illustrates a step of forming a water repellent layer and / or a primer layer after the calendering step, but is not limited thereto. It is not.

For the fabric having the primer layer 200 formed or the base layer, the conductive layer 300 is formed according to a predesigned shape thereon. The conductive layer 300 may be coated in various ways such as coating, printing, transfer printing, and the like. In particular, in the preferred embodiment of the present invention, a method of forming the conductive layer 300 through printing will be described as an example. According to the printing method, the circuit can be designed on the fabric according to the designed form without being limited to the attachment position of the electronic equipment to be used. In this regard, the fabric according to the present invention may be referred to as a flexible printed fabric circuit board (FPFCB).

The conductive layer 300 is 2 to 500㎛ thickness, 10 to 20mm in width, the resistance value of the fabric is preferably maintained before and after washing 0.5 ~ 4Ω. In addition, the electrode may be 1 to 30% by weight of carbon, silver may be 1 to 70% by weight. The binder that may be used in the heat generating layer and / or the conductive layer may be one or more selected from the group consisting of a polyurethane resin, an acrylic resin, a silicone resin, a melamine resin, and an epoxy resin with compatibility with the primer layer 200. (Conductive layer forming step)

3A and 3B illustrate an example in which a conductive layer is formed on a fabric according to an embodiment of the present invention. FIG. 3A illustrates a free circuit pattern, and FIG. 3B illustrates a straight line 310 of the conductive pattern. An example is shown in the form of a wider 350 than the circuit 330. In FIG. 3B, the circular shape is exemplified as the above shape, but the shape is not limited thereto. If the shape is wider than the width of the linear circuit, other shapes such as circular and elliptical may be adopted.

It is more preferable to form the bent portion in a relatively wide shape, which may be supported by the following equation.

W = I ² R

R = ρ L / S

W: power, R: resistance, ρ: specific resistance, L: length of conductor, S: cross-sectional area

As the area increases according to the above formula, the resistance decreases, and the flow of current increases with it. Therefore, since the bent portion 310 is formed in a wide form 350, it may be a factor that increases the amount of current.

If the bent portion 310 of the conductive wire is formed at right angles or angles, a surge may occur due to a sudden change in current flow, and an exothermic reaction may occur.

The surge phenomenon refers to a transient waveform of electric current, voltage, or power that is transmitted along a wire or an electric circuit and has a characteristic of rapidly increasing and decreasing gradually in a short time. Lightning days are the main causes of power cuts, phone calls, and the destruction of sensitive semiconductors. Sudden overvoltages on power lines, especially strong or long surges, can disrupt insulation or interfere with electronic equipment, so surge protectors or surge suppressors are placed between the power and computer terminals to suppress or minimize current changes.

Therefore, in the present invention, by changing the area of the bent portion 310 to reduce the reverberation value to minimize the occurrence of the surge phenomenon and to smoothly flow even if the current amount increases.

After the conductive layer 300 is formed, the insulating layer 400 may be formed thereon. The insulating layer 400 is directly coated, printed, laminated with a solvent-type polyurethane resin, water-dispersible polyurethane resin, oil-soluble acrylic resin, water-soluble acrylic resin, silicone resin, polyester resin, polytetrafluoroethylene (PTFE) resin It can be formed by the dating. In the case of the coating method, a dry method is preferable, and in the case of a laminating method, a hot melt type dot or gravure method is preferable. (Insulation layer forming step)

In the case of the coating method in the insulating layer forming step, the resistance value varies depending on the coating composition, thereby affecting durability.

In addition, the insulating layer may be formed on both sides of the fabric as well as the cross section. Therefore, in view of the fact that the fabric properties require several washings, the selection of a coating composition to enable insulation to occur in the long term, that is, to exhibit excellent washing resistance, is an important factor.

On the other hand, after the calendering step, the waterproof fabric or waterproof treatment may be selectively processed to the fabric constituting the base layer 100. The pores formed by the moisture-permeable waterproof or waterproof treatment not only cancel the pores of the fabric constituting the base layer, but also serve to compensate for insulation, washing resistance, and bending resistance. It is preferable to apply a resin which is compatible with the conductive material as the material used for the moisture-permeable waterproofing process.

As described above, the fabric according to the present invention does not need to form an area requiring energization in advance in designing the fabric, and can form a conductive area directly on the fabric or clothing that is already manufactured, and is not limited to wearability even when the conductive area is formed. There is no feature that ensures dynamic wearability.

Example 1

After performing a calendering step on a polyester plain weave fabric and forming a primer layer with a fluorine-water-repellent and solvent-type polyurethane resin, a conductive layer was formed as a silver paste on the primer layer. After that, an insulating layer was formed using a liquid silicone rubber. The conductive layer was formed by screen printing with a width of 10 mm and a thickness of 10 μm.

Example 2

As in Example 1 above, only fluorine-water repellent was performed in forming the primer layer.

Example 3

In the same manner as in Example 1 above, in forming the primer layer, water-repellent processing was performed with silicon, and a primer layer was formed as a mixed resin of silicone and acrylic.

Example 4

 In the same manner as in Example 1 above, only the silicone water repellent was performed in forming the primer layer.

Example 5

In the same manner as in Example 1 above, in forming the conductive layer, a silver paste and an acrylic binder were used. In this case, the content ratio (by weight) of the silver paste and the binder is 90:10.

Example 6

As in Example 2 above, the silver paste and the acrylic binder were used to form the conductive layer. In this case, the content ratio (by weight) of the silver paste and the binder is 90:10.

Example 7

In the same manner as in Example 1 above, in forming the conductive layer, a silver paste and a water dispersible polyurethane binder were used. In this case, the content ratio (by weight) of the silver paste and the binder is 90:10.

Example 8

In the same manner as in Example 2, in forming the conductive layer, a silver paste and a water dispersible polyurethane binder were used. In this case, the content ratio (by weight) of the silver paste and the binder is 90:10.

Example 9

In the same manner as in Example 1, in forming the conductive layer, a silver paste and a silicon-based binder were used. In this case, the content ratio (by weight) of the silver paste and the binder is 90:10.

Example 10

As in Example 2 above, silver paste and a silicon-based binder were used to form the conductive layer. In this case, the content ratio (by weight) of the silver paste and the binder is 90:10.

Example 11

In the same manner as in Example 7, the content ratio of the silver paste and the binder was 95: 5.

Example 12

In the same manner as in Example 7, the content ratio of the silver paste and the binder was 85:15.

Example 13

* Same as Example 7, except that the content ratio of the silver paste and the binder was 80:20.

Example 14

In the same manner as in Example 8, the content ratio of the silver paste and the binder was 95: 5.

Example 15

As in Example 8, the content ratio of the silver paste and the binder was 85:15.

Example 16

As in Example 8, the content ratio of the silver paste and the binder was 80:20.

Example 17

As in Example 7 above, the conductive layer was formed by screen printing in a width of 20 mm.

Example 18

As in Example 7, the conductive layer was formed by screen printing to a thickness of 10 μm.

Comparative Example 1

As in Example 7 above, the conductive layer was not formed.

Test result

1. Laundry resistance

* Test method (KS K ISO 6330)

Washing the fabrics produced from each of the above embodiments and by measuring their resistance changes to determine the conditions to ensure the washing resistance. Specifically, in the horizontal drum washing machine (WDCR 1010, LG Electronics, Inc), the resistance value and the change rate of each fabric were measured after the wool course (57 minutes) and the high temperature drying condition (1 hour) without including detergent. The results are shown in Table 1 below.

* evaluation

Relatively low rates of resistance increase were found in the samples associated with Examples 7 and 8. In Examples 1 and 2, as shown in FIGS. 4A and 4B, cracks were generated on the surface of the conductive layer even in a single washing, and the increase in resistance was observed due to interruption of the flow of current, but as in FIGS. The sample of 8 did not damage the surface of the conductive layer even after four washes. This improves the adhesion between the fabric and the silver paste due to the mixing of binders, and in particular, the water-dispersible polyurethane binder reduces the friction and physical deformation caused by washing due to the inherent properties (elasticity) of the polyurethane mixed with the silver paste. Increasing resistance has been reduced by reducing cracks.

2. Evaluation of Effect by Binder Content

* Test method (KS K ISO 6330)

The content of the binder was changed to 0 to 20wt%, respectively, to measure their resistance value and resistance change rate after washing. The results are shown in Table 2 below.

As described above, the increase in resistance value due to washing was greatly reduced by mixing the water-dispersible polyurethane binder, but the initial resistance value increased according to the binder content. In addition, when the binder content is 5% by weight, washing resistance is lowered, and when the weight is 20% by weight, the phenomenon that the initial resistance value is increased even though the washability is excellent. In addition, before and after washing, the resistance value of the conductive layer should be maintained at 0.5 to 4 ohms to determine the desirable electrical conductivity.

3. Measurement of exothermic temperature of conductive layer

In general, if the resistance is higher than a certain level, the current is interrupted by the overload when the voltage is applied. Therefore, a heat generation phenomenon may occur in the fabric or the conductive layer according to the embodiments of the present invention, in particular, the power connection portion, the pattern shape. The measurement was performed by changing the variable values of the electrode thickness, the width, and the mixing amount of the binder. (Measurement Method: Thermal Camera, InfraCAM, FLIR System)

(1) Heat generation pattern according to binder mixing amount

Table 3 shows photographs of heating patterns according to Example 1 (0%), 11 (5%), 7 (10%), 12 (15%), and 13 (20%). From the above results, the phenomenon that the exothermic temperature increased as the amount of the binder increased. This is believed to be a result of lowering the electrical conductivity by mixing the non-conductive material (organic material) with the inorganic components constituting the conductive layer. On the other hand, it can be seen that the embodiment in which the binder is mixed as in Test 1, in consideration of the increase in the washing resistance, must derive the optimum condition between the washing resistance and the electrical conductivity. In this regard, the mixed amount of the binder is determined to be the most preferable 10 to 15% by weight.

* (2) Influence by line width of conductive layer

Table 4 is a photograph of the heating pattern of Example 7 (1 cm) and Example 17 (2 cm). In the case of the fabric according to Example 7, heat generation in the 50 ° C band occurred. It is determined that the flow of charge is not easy. On the other hand, in Example 17, the exothermic phenomenon was observed to decrease.

(3) Influence by thickness of conductive layer

Table 5 sms Examples 7 (10 µm) and 18 (20 µm) of the heating pattern photograph. As shown in the photograph, Example 7 had a heat generation in a band of about 45 ° C., and Example 18 had a heat generation in a band of about 29 ° C. Through this, the charge may be affected by the thickness of the conductive layer.

4. Tensile Strength Evaluation

Tensile experiments were carried out in Example 7 and Comparative Example 1 by ASTM D 503494 method. Specifically, each fabric specimen was formed to have a width of 50 ± 1 mm and a length of 150 mm, and the fabric was cut into four parts of A, B, C, and D. Each tensile strength was measured using an Instron (Instron 4444, series). Physical properties were measured. The results are shown in Table 6 and FIGS. 8A to 8D. At this time, the load (keg) 2kN, the distance (gauge length) 75 ± 1mm, the crosshead speed (300mm ± 10mm / min) was measured at least five times.

In addition, electrical properties were measured in real time by the resistance of the tensile strain by connecting the forceps of the multimeter to the conductive layer pattern of the sample fixed to the clamp during the above tensile test.

From the above results, it can be seen that the tensile strength and the elongation of the fabric according to one embodiment of the present invention are not significantly changed compared to those of the general fabric as in Comparative Example 1. In particular, in Example 7, even though the conductive layer pattern is different, the tensile strength and the elongation are similar, which means that there is no influence by the conductive layer pattern. That is, since the conductive layer pattern does not affect the tensile strength and elongation of the fabric, it is possible to print freely on the fabric to secure dynamic wearability of the fabric according to the present invention.

On the other hand, Figure 9 is a graph showing the change in the resistance value at the time of tensile deformation of Example 7, the resistance value also gradually increases as the tensile length increases in the above results, the resistance value is rapidly increased at a tensile length of about 20 to 24mm Able to know. This is because the pattern of the conductive layer is cut.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be clear to those who have knowledge of.

In particular, in describing the present invention, only the example applied to the smart clothing is described, but the conductive fabric according to the present invention can be applied as a circuit board or a part of an electronic device.

1 is a cross-sectional view of a conductive fabric in accordance with a preferred embodiment of the present invention.

Figure 2 is a manufacturing process of the conductive fabric according to an embodiment of the present invention.

Figure 3a and 3b is an illustration of a conductive layer pattern formed on a free conductive layer pattern and the bending portion in a wide fabric in accordance with an embodiment of the present invention.

4A to 4D are surface photographs of the conductive layer after washing once in Example 1, after washing once in Example 2, after washing four times in Example 7, and after washing four times in Example 8. FIG.

Figure 5 is a resistance value graph of washing steps of Examples 1 to 4.

6 is a resistance value graph for each step of washing according to embodiments.

7 is a graph of the resistance value of the washing step according to the binder content.

8A and 8D are graphs of stress extension of fabrics A, B, C, and D according to Example 7. FIG.

9 is a graph showing a change in resistance value at the time of tensile deformation in Example 7. FIG.

<Description of Major Symbols in Drawing>

10: conductive fabric

100: base layer 200: primer layer

300: conductive layer 400: insulating layer

Claims (17)

As a manufacturing method of a conductive fabric comprising a base layer, a conductive layer and an insulating layer, Forming a conductive layer on top of the base layer formed of synthetic fibers, recycled fibers or natural fibers; And Forming an insulating layer on the top of the conductive layer to prevent damage to the conductive layer, When the bending portion is formed in the conductive layer is a method of manufacturing a conductive fabric, characterized in that formed in a relatively wider form than a linear circuit. The method of claim 1, Before forming the conductive layer, further comprising the step of forming a primer layer for maintaining a uniform thickness of the conductive layer on top of the base layer. The method of claim 2, The primer layer is a method of manufacturing a conductive fabric, characterized in that formed as a multilayer structure with a water repellent layer. The method of claim 1, Before forming the conductive layer, further comprising a calendering step of smoothing the surface of the base layer, offsetting the voids of the base layer, and pressing the fabric of the base layer with a compression roller to compensate for the bend resistance Method for producing a conductive fabric. The method of claim 4, wherein After the calendering step to selectively offset the pores of the conductive fabric, the method of manufacturing a conductive fabric, characterized in that it further comprises a moisture-permeable waterproof / waterproof step to compensate for insulation, washing resistance, and bend resistance. The method according to claim 2 or 3, The primer layer is a method of manufacturing a conductive fabric, characterized in that formed by one or more selected from the group consisting of polyurethane-based resins, acrylic resins, and silicone-based resins. The method of claim 1, The conductive layer is a method of manufacturing a conductive fabric, characterized in that formed by at least one selected from the group consisting of a conductive polymer, carbon (carbon), a metal material and a mixture of the material and the binder. The method of claim 7, wherein The conductive polymer is a method for producing a conductive fabric, characterized in that at least one selected from the group consisting of polyaniline, polypyrrole and polythiophene. The method of claim 7, wherein The metal material and the binder forming the conductive layer is a manufacturing method of the conductive fabric, characterized in that it comprises 90: 10 to 80: 20 by weight. The method of claim 7, wherein The binder is a method of producing a conductive fabric, characterized in that at least one selected from the group consisting of polyurethane resin, acrylic resin, silicone resin, melamine resin and epoxy resin. The method of claim 1, The conductive layer is a method of manufacturing a conductive fabric, characterized in that formed to a thickness of 2 to 500㎛. The method of claim 11, Thickness of the conductive layer is a manufacturing method of the conductive fabric, characterized in that 10 to 20㎛. The method of claim 1, The width of the conductive layer is a manufacturing method of the conductive fabric, characterized in that 10 to 20mm. The method of claim 1, The insulating layer is formed by coating, printing, or laminating at least one selected from the group consisting of polyurethane resin, acrylic resin, silicone resin, polyester resin, PVC resin, and polytetrafluoroethylene (PTFE) resin. Method for producing a conductive fabric. The method of claim 14, The insulating layer is a method of manufacturing a conductive fabric, characterized in that the direct coating is a dry coating, in the case of laminating is formed in a hot melt dot or gravure method. The method of claim 1, The wide form is a method of manufacturing a conductive fabric, characterized in that the circular or oval. The method of claim 1, The resistance value of the fabric is a method of manufacturing a conductive fabric, characterized in that 0.5 to 4Ω before and after washing.

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