JP6778549B2 - Connection method and conductive fabric - Google Patents

Description

The present invention relates to a method for electrically connecting electrical and electronic components and conductive member to the conductive fabric. Further, it relates to a conductive fabric in which an electrical connection is formed.

While portable electronic devices are becoming smaller, wearable devices with the idea of wearing electronic devices are attracting attention. It has been proposed to form circuits and wirings on fabrics used for clothing and the like with conductive materials so that they can function as electronic devices.

When electrically connecting electrical / electronic components to circuits and wiring formed on conductive fabric, the soldering method cannot be used. This is because the heat generated during soldering causes the fabric, which is the base material of the conductive fabric, to be burnt or melted. As a connection method for avoiding this problem, a method using a conductive adhesive containing a large amount of conductive fine particles (Patent Document 1) can be considered, but it has been difficult to achieve both conductivity and adhesive strength. There is also a problem that the flexibility of the fabric is impaired.

Japanese Unexamined Patent Publication No. 2011-205134

The present invention provides a connecting member having both conductivity and adhesive strength when making an electrical connection to a conductive fabric, and a connecting method using the connecting member. Another object of the present invention is to provide a conductive fabric having a connecting member and a connecting portion using the connecting method.

As a result of diligent studies, the present inventor impregnates a conductive base material having internal voids with a hot-melt type adhesive, and electrically connects the conductive cloth with electrical / electronic parts and conductive members through the impregnated adhesive. We have found that good conductivity and high adhesive strength can be achieved by connecting them, and have reached the present invention.

In the connection method of the present invention, an impregnated portion of a hot melt adhesive impregnated on the surface of at least a part of a conductive base material having internal voids is superposed on the conductive portion of the conductive fabric, and further, the conductive base material This is a connection method in which a conductive member is placed on another portion impregnated with the hot melt adhesive, and then heated and pressurized.

In the connection method of the present invention, a conductive base material having an internal void is placed on a conductive portion of a conductive cloth after applying a hot melt adhesive, and a conductive member to which the hot melt adhesive is applied is attached to the conductive group. This is a connection method in which heating and pressurization are performed after arranging on the other surface of the material.

In the conductive fabric of the present invention, an electrical connection is formed using a conductive base material having internal voids and a connecting member made of a hot melt adhesive impregnated on the surface of at least a part of the conductive base material. It is a conductive cloth. In the conductive fabric of the present invention, the conductive member is electrically connected via a connecting member made of a conductive base material having internal voids and a hot melt adhesive impregnated on the surface of at least a part of the conductive base material. It is a connected conductive fabric.

According to the present invention, it is possible to provide a connecting member and a connecting method that achieve both good conductivity and high adhesive strength when forming an electrical connection on a conductive fabric. Further, in the conductive fabric of the present invention, electrical connection is achieved without impairing the flexibility of the fabric.

It is the schematic explaining the structure of the connection member of this invention. It is a process drawing explaining an example of the connection method of this invention. It is a process drawing explaining another example of the connection method of this invention.

The connecting member of the present invention is composed of a conductive base material having internal voids. High adhesive strength can be exhibited by impregnating the internal voids with a hot melt adhesive. Examples of those having such internal voids include synthetic resin foams and fiber fabrics.

Examples of the synthetic resin foam include polyurethane foam and polyolefin foam, and among them, polyurethane foam is preferable because it is excellent in processability and flexibility.

Examples of the fiber fabric include woven fabrics, knitted fabrics, and non-woven fabrics made of natural fibers and synthetic fibers. The type of fiber and the structure and structure of the fabric are not particularly limited, but polyester or nylon is preferable as the fiber type from the viewpoint of easily imparting conductivity by metal plating and excellent heat resistance.

The volume ratio of the internal voids in the conductive substrate is preferably 20 to 98%. When the volume ratio is 20 to 98%, the effect of excellent balance between adhesive strength and conductivity can be obtained. Examples of the method for measuring the volume ratio of the internal voids include a method of calculating from the volume and the specific gravity, and a method of calculating from the area ratio of the cross section.

The method for obtaining the conductive base material may be either a method using a conductive synthetic resin or fiber as a material, or a method of imparting conductivity to a non-conductive synthetic resin foam or fiber cloth by processing. Good. Conductive synthetic resin, as fibers, polyurethane and polyolefin kneaded with carbon black and metal compounds as conductive particles, polyester and nylon kneaded with carbon black and metal compounds as conductive particles, alone or in combination with other resins Examples include spun fibers, carbon fibers, and fine metal wires. Examples of the method of imparting conductivity to the non-conductive synthetic resin foam or fiber cloth by processing include a method of metal plating, a method of coating with a conductive polymer solution, and a method of coating with a conductive paint. Among them, the method of imparting conductivity by metal plating is preferable in that high conductivity can be stably imparted.

As the metal plating, either electroplating or electroless plating can be adopted. Examples of the metal used for metal plating include copper, silver, nickel, tin, and gold, and among them, copper and silver are preferable because of their excellent conductivity. In addition, nickel and gold are preferable because they do not easily rust. The methods of electroplating and electroless plating can employ conventionally known methods and are not particularly limited.

Examples of the hot melt adhesive used for the connecting member of the present invention include a polyurethane hot melt adhesive, a polyolefin hot melt adhesive, and a polyethylene vinyl acetate hot melt adhesive. Of these, polyurethane-based hot melt adhesives are preferable because they have excellent elasticity. The melting temperature at which the hot melt adhesive exhibits adhesiveness is preferably 50 to 150 ° C. When the melting temperature is in the range of 50 to 150 ° C., the conductive fabric does not melt when used at room temperature, and damage due to heat of the conductive fabric can be prevented.

The hot melt adhesive is impregnated on the surface of at least a part of the conductive substrate. FIG. 1 shows a state in which a part of the block-shaped conductive base material 1 is impregnated with the hot melt adhesive. This is an example of a state in which the hot melt adhesive is impregnated on the lower surface of the block-shaped conductive base material 1 and the front side of the left end portion to about a quarter of the thickness direction of the conductive base material.

As another example, the surface of the block-shaped conductive substrate may be impregnated with a hot melt adhesive over one surface thereof, or the two opposite surfaces may be impregnated with the hot melt adhesive. May be good. The conductive base material may be in the form of a thin sheet or in the form of a thin and thin ribbon. In this case, hot-melt adhesive is applied to a part of the conductive base material from the front surface to the back surface in the entire thickness direction. The agent may be impregnated. In the case of a thin and small conductive base material, the entire surface may be impregnated with a hot melt adhesive. That is, regardless of the shape and size of the conductive base material, the hot melt adhesive may be exposed and present near the surface of the conductive base material on at least a part of at least one surface of the conductive base material. There are no restrictions on the size, shape, etc. of the portion impregnated with the hot melt adhesive, but the position must be on or near the surface of the conductive substrate.

Since the connecting member of the present invention has the above configuration, the hot melt adhesive impregnated portion of the connecting member is placed on the conductive portion of the conductive fabric, and heated and pressurized to obtain the hot melt adhesive. Melts and exhibits moderate fluidity and adhesiveness. At the interface between the conductive portion of the conductive fabric and the connecting member after being bonded in this way, the conductive portion of the conductive fabric and the conductive base material of the connecting member are partially in contact with each other to form an electrical connection. In other parts, the conductive fabric and the connecting member are adhered to each other via a hot melt adhesive. Since the conductive base material of the connecting member has a continuous metal film formed in all of the thickness direction, the vertical direction, and the horizontal direction, good conductivity can be obtained. Since it is not necessary for the hot melt adhesive to contain fine particles or the like that alienate the adhesiveness, high adhesiveness can be exhibited.

As a first aspect, the connecting method of the present invention is hot-melt adhesive in a connecting member impregnated on the surface of at least a part of a conductive base material having internal voids on the conductive portion of the conductive fabric as described above. This is a connection method in which the impregnated parts of the agent are overlapped and heated and pressurized. This connection method will be described with reference to FIG.

FIG. 2A shows the conductive fabric and the connecting member. In this example, a polyurethane resin is applied to the surface of the cloth 3 to form the polyurethane sheet 4, and a conductive cloth in which the conductive portion 5 is laminated on the surface of the polyurethane sheet will be described. The polyurethane sheet 4 has a purpose of smoothing the surface of the cloth 3 to facilitate the formation of the conductive portion 5, and a purpose of preventing disconnection of the formed conductive portion 5. The conductive portion 5 may be formed by laminating metal foils cut into a desired shape, or may be formed by printing a conductive paste.

The case where the connecting member has a thin and elongated ribbon shape is illustrated. A portion impregnated with a hot melt adhesive is formed at one end of the connecting member. The hot melt adhesive impregnated portion 2 is superposed on the conductive fabric at a position where a connection is formed in the conductive portion 5, and is arranged as shown in FIG. 2 (b). In this state, the hot melt adhesive impregnated portion 2 is heated and pressurized. After heating and pressurizing for a predetermined time, if it is cooled by allowing it to stand, the hot melt adhesive will cure again and the adhesion will be completed. FIG. 2C is a diagram schematically showing a cross section of a portion where a connection is formed.

In the example of FIG. 2, an electrical connection with the conductive fabric is formed at one end of the connecting member, and the portion of the connecting member that does not participate in the electrical connection is used as the conductive member. That is, it can be used as a wiring portion for connecting the conductive cloth and the external device.

In the second aspect of the connection method of the present invention, a hot melt adhesive is applied onto the conductive portion of the conductive fabric, and then a conductive base material having internal voids is placed, and heating and pressurization are performed. The method can be mentioned.

As a third aspect of the connection method of the present invention, an impregnated portion of a hot melt adhesive impregnated on the surface of at least a part of a conductive base material having internal voids is overlaid on the conductive portion of the conductive fabric. Further, this is a connection method in which a conductive member is placed on another hot melt adhesive impregnated portion of the conductive base material, and then heated and pressurized. In this case, the connecting member is provided with two portions impregnated with the hot melt adhesive.

In the third aspect, a method of electrically connecting the conductive cloth and the conductive member via the connecting member is shown. Examples of the conductive member include various electric / electronic parts and wiring members. Further, the conductive member may be another conductive cloth. It is possible to electrically connect the two conductive fabrics, and for example, when manufacturing clothing using the conductive fabric, it can be used to realize the electrical connection at the sewn portion. In the conductive fabric in which the electrical connection is formed by the connection method of the present invention, the electrical connection is maintained even when the connecting portion is sewn.

As a fourth aspect of the connection method of the present invention, a conductive base material having an internal void is arranged after applying a hot melt adhesive on the conductive portion of the conductive cloth, and the conductive base material to which the hot melt adhesive is applied is applied. This is a connection method in which a member is placed on the other surface of the conductive base material and then heated and pressurized.

The fourth aspect will be described with reference to FIG. FIG. 3 shows an example of connecting two conductive fabrics using a cross-sectional view. FIG. 3A shows a state in which the hot melt adhesive 6 is applied to a desired position in the conductive portion 5 of each of the two conductive fabrics. FIG. 3B shows a state in which the conductive base material 1 having internal voids is arranged on the hot melt adhesive 6 applied to one of the conductive fabrics. FIG. 3C shows a state in which the portion of the hot melt adhesive 6 applied to the other conductive fabric is superposed on the upper surface of the conductive base material 1 having internal voids. By heating and pressurizing the connecting portion in this state, the hot melt adhesive 6 is melted and impregnated into the internal voids of the conductive base material 1, and at the same time, electrical connection between the conductive fabrics is achieved, and FIG. 3 (d) ) Is shown. At this time, the hot melt adhesive impregnated portion 2 impregnated with the hot melt adhesive 6 is formed on the conductive base material 1.

Although the method of applying the hot melt adhesive 6 to the conductive fabric is shown in the fourth aspect of the connection method of the present invention, the hot melt adhesive 6 is applied to the conductive base material 1 having internal voids. Is also good. Examples of the method of applying the hot melt adhesive include a method of applying a hot melt adhesive in a fluid state, a method of attaching a sheet-shaped or ribbon-shaped hot melt adhesive piece, and the like.

The conductive cloth of the present invention is a conductive cloth in which an electrical connection is formed by using the above-mentioned connecting member. Another aspect of the conductive cloth of the present invention is a conductive cloth in which the conductive members are electrically connected by using the above-mentioned connecting members. Examples of the conductive member include various electric / electronic parts, wiring members, and conductive fabrics.

Hereinafter, the present invention will be described with reference to Examples, but the present invention is not limited by these Examples. The evaluation methods for various physical properties in this example are as follows.

<Conductivity>
The conductive fabric having a width of 10 mm and a length of 40 mm and the conductive surface of the connecting member having a width of 10 mm and a length of 40 mm at an end width of 10 mm and a length of 10 mm are simply brought into contact with each other. The electrical resistance was measured and used as the electrical resistance value before connection. Next, the contacted portion was heated at 130 ° C., 0.5 MPa for 1 minute with a heat transfer press machine HP-4536A-12 manufactured by Hashima Co., Ltd. using a hot melt sheet manufactured by Seadam Co., Ltd .: Part No. SHM-101PUR (thickness 70 μm). It was pressed and connected to obtain a conductive fabric in which an electrical connection was formed. The electrical resistance between the obtained conductive fabric on which the electrical connection was formed and both ends of the connecting member was measured and used as the electrical resistance value after the connection. Conductivity = (electrical resistance value after connection) / (electrical resistance value before connection), and if the conductivity was less than 2.0, it was judged that the conductivity was good.

<Adhesive strength>
The conductive fabric with the electrical connection obtained above was subjected to a T-type peel test at a peeling speed of 10 mm / sec using a tensile tester manufactured by Shimadzu Corporation: Part No. EZtest, and this was used as the adhesive strength. did.

[Example 1]
As a connecting member, copper is plated on a polyester woven fabric (texture: plain weave, warp: PET30d / 36f, weft: PET62d / 150f, warp density: 192 threads / inch, weft density: 122 threads / inch, thickness 90 μm). A metal-plated cloth to which 35 g / m ² was applied and 5 g / m ² of silver was further applied by electrolytic silver plating was used. The volume ratio of the internal voids of this connecting member was 48%.

Urethane sheet manufactured by Kurabo Co., Ltd .: DuPont Electronics Materials Co., Ltd. silver paste: PE872 is stencil-printed on product number Cranzier U-1490 (thickness 100 μm) using a stencil with a thickness of 100 μm, and dried in a hot air circulation drying furnace at 130 ° C. for 15 minutes. did. The thickness of the silver paste after drying was 25 μm. Next, Asahi Kasei Advance Co., Ltd .: Part number AKT1750 (thread user NY44T / 34f 66%: PU44T 10%: PU310T 24%, grain 430g / m ² ), Seadam Co., Ltd. hot melt sheet: Part number SHM-101PUR (thickness) 70 μm) is further overlaid on the surface of the urethane sheet not coated with silver paste, and hot-pressed at 130 ° C., 0.5 MPa for 1 minute with a heat transfer press machine HP-4536A-12 manufactured by Hashima Co., Ltd. to conduct conductivity. A sex cloth was obtained. Using this conductive cloth and the connecting member, the conductivity obtained by the above evaluation method was 1.57, which was a good result. The adhesive strength was 0.24 N / mm. The results are shown in Table 1.

[Example 2]
Connecting members are silver-plated yarn fabric (twill: twill weave, warp: PET30d / 12f, weft: silver-plated PET yarn 36d / 12f / silver plating amount 20 wt%, warp density: 190 yarns / inch, weft yarn density: 140 yarns / inch. The conductivity and the adhesive strength were evaluated in the same manner as in Example 1 except that the thickness was 140 μm and the volume ratio of the internal voids was 77%. The conductivity was 0.75, which was a good result. The adhesive strength was 0.91 N / mm. The results are shown in Table 1.

[Example 3]
Other than replacing the connecting member with a conductive foam manufactured by Seiren Co., Ltd. (a conductive polyurethane foam having an electroless plated copper coating on the surface of the polyurethane foam and a nickel coating on the surface of the polyurethane foam with a volume ratio of 88% of internal voids). Evaluated the conductivity and the adhesive strength in the same manner as in Example 1. The conductivity was 1.84, which was a good result. The adhesive strength was 0.31 N / mm. The results are shown in Table 1.

[Example 4]
The conductive fabric is a metal-plated fabric (texture: plain weave, warp: 30d / 36f, weft: 62d / 150f, warp density: 192 threads / inch, weft density: 122 threads / inch, thickness 90 μm, and non-electrolytic copper. The conductivity and adhesive strength were evaluated in the same manner as in Example 1 except that the fabric was plated with 35 g / m ² of copper and then replaced with 5 g / m ² of silver by electrolytic silver plating. The conductivity was 1.20, which was a good result. The adhesive strength was 0.42 N / mm. The results are shown in Table 1.

1 Conductive base material 2 Hot melt adhesive impregnated part 3 Cloth 4 Polyurethane sheet 5 Conductive part 6 Hot melt adhesive

Claims (4)

An impregnated portion of the hot melt adhesive impregnated on the surface of at least a part of the conductive base material having internal voids is superimposed on the conductive portion of the conductive fabric, and further impregnated with the hot melt adhesive of the conductive base material. A connection method in which a conductive member is placed on another portion and then heated and pressurized. A conductive base material having internal voids is placed on the conductive portion of the conductive fabric after applying the hot melt adhesive, and the conductive member to which the hot melt adhesive is applied is placed on the other surface of the conductive base material. After that, a connection method that heats and pressurizes. A conductive fabric in which an electrical connection is formed by using a connecting member made of a conductive base material having internal voids and a hot melt adhesive impregnated on the surface of at least a part of the conductive base material . A conductive fabric in which a conductive base material having internal voids and the conductive base material are electrically connected via a connecting member made of a hot melt adhesive impregnated on the surface of at least a part of the conductive base material .

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