KR20050076370A - Electric conductive gasket - Google Patents

Abstract

An electrically conductive sheet consisting of a woven synthetic fiber base, an aluminum foil adhered to the surface of the woven synthetic fiber base via an adhesive, and a hot melt layer formed on the back side of the woven synthetic fiber base, and continuously by the electrically conductive sheet. An electrically conductive gasket is disclosed that includes a non-conductive elastic member that is wrapped and overlapped so as to be bonded by a hot melt layer. The manufacturing cost can be reduced by half compared to electroless plated conductive fibers, and no special equipment or technology is required for manufacturing, and since the base is made of non-conductive synthetic fibers, electroless plating is used in the manufacture of the electrically conductive sheet. It does not cause pollution, and has excellent flexibility and mechanical strength.

Description

Electrical conductive gasket

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrically conductive gasket, and more particularly, it is environmentally friendly as a gasket which prevents leakage or intrusion of electromagnetic waves or serves as a ground line of electronic circuits in various joints and connections of electronic devices. The present invention relates to an electrically conductive gasket having reduced manufacturing cost.

In response to the development of the electronic communication industry and the establishment of the information society, modern home appliances, industrial electronic devices and information communication devices are required to be downsized, have high processing capacity, and have low power consumption. More devices were installed in the space. As a result, it was gradually placed in an environment susceptible to electromagnetic noise and heat, and various measures were taken to solve the problem.

The main parts of the device to which electromagnetic waves leak and penetrate include a connection part of the device, a cable, a transparent display panel, and a connector connection part. Among them, to shield the electromagnetic wave generated from the cable, shield or ground the cable itself, and use twisted wires or cores inside the cable as much as possible. In addition, in order to shield electromagnetic waves leaked to the transparent display panel, the transparent display panel is manufactured by using a transparent insulating material such as acryl, and a metal fabric mesh and a conductive mesh are embedded in the transparent display panel or a conductive material is transparent on one side of the transparent display panel. By deposition.

In such a part, although electromagnetic wave shielding is possible to some extent, shielding in the connection part of an apparatus is not easy enough.

The electromagnetic shielding at the connection part of the device is mainly performed to prevent outside radio waves from entering the inside of the device through the atmosphere or to prevent leakage of the electromagnetic waves generated inside the device to the outside. In order to maximize the shielding of the electromagnetic wave at the connection part of the device, it is optimal to design it seamlessly, but it is impossible to make it seamless at the connection part of the device. Therefore, electromagnetic intrusion or leakage at the connection part of the device is inevitable and an electrically conductive gasket is used to prevent it.

Electrically conductive gaskets include finger gaskets made of beryllium or copper, conductive silicone gaskets made by mixing and curing metal powder with non-conductive silicon, and knitting gaskets knitted with conductive wires on non-conductive urethane or silicon. gasket).

However, the most common gasket is an electrically conductive fabric gasket wrapped with electrically conductive fibers in a nonconductive urethane sponge. Looking at the manufacturing method of the electrically conductive fiber gasket, the electroless plating of nickel, copper, silver or gold on the woven nylon or polyester fiber to produce an electrically conductive fiber and the non-conductive polymer hot melt coated on one side of the electrically conductive fiber After applying urethane sponge while applying heat, the hot melt melts and is in contact with the urethane sponge.

According to the electrically conductive fiber gasket, nickel, copper, silver or gold is used as a metal material for electroless plating the non-conductive fiber when manufacturing the electrically conductive fiber, which is expensive and consequently increases the manufacturing cost.

In order to solve this problem, electroless plating may be considered using inexpensive aluminum, but aluminum is a positive metal having both positive and negative ions, and thus electroless plating cannot be performed. In other words, nickel, copper, silver, or gold is a cation-containing metal, so electroless plating is possible, but aluminum or magnesium is a positive metal, and thus electroless plating is impossible.

In addition, there is a problem that the electrically conductive fibers generated when discarding the gaskets are not environmentally friendly because they contain harmful chemical components.

Moreover, since the fabric is handled in the manufacturing process, there is a problem in that pollution such as dust is generated and the working environment is worsened. That is, since the electrically conductive fibers are electroless plated with metal on the woven fibers, dust is always attached to the outer uneven portions of the fibers.

In addition, since the outer surface of the fiber is made of only fiber, there is a disadvantage in that the cutting surface is unwinded.

In addition, when the metal to be plated is nickel, skin troubles such as allergy are generated, and in the case of copper, there is a problem of discoloration.

In order to solve such a problem, the applicant's patent No. 2003-85375 is made of a natural pulp base, an aluminum foil attached to the surface of the natural pulp base through an adhesive and a hot melt layer formed on the back of the natural pulp base. An electrically conductive gasket comprising an electrically conductive sheet and a non-conductive elastic member that is continuously and overlapped by an electrically conductive sheet and bonded by a hot melt layer is disclosed. Here, the natural pulp base includes natural pulp nonwoven fabric or paper, and can be replaced with a synthetic film.

However, according to this configuration, the synthetic film is inflexible and can not be changed in shape, it is difficult to give the irregularities on the surface, the paper has a disadvantage that is easy to tear.

Accordingly, it is an object of the present invention to provide an electrically conductive gasket which is inexpensive and has excellent electromagnetic shielding characteristics, excellent grounding effect, and environment-friendly.

Another object of the present invention is to provide an electrically conductive gasket that is excellent in flexibility and difficult to tear.

Other objects and features of the present invention will be more clearly understood from the embodiments described below.

According to the present invention, there is provided an electrically conductive sheet comprising a woven synthetic fiber base, an aluminum foil attached to the surface of the woven synthetic fiber base with an adhesive, and a hot melt layer formed on the back side of the woven synthetic fiber base; An electrically conductive gasket is disclosed that includes a non-conductive elastic member that is continuously and overlapped by a conductive sheet and bonded by a hot melt layer.

Preferably, the woven synthetic fiber base comprises polyester (PET) or nylon, the thickness of the electrically conductive sheet is 150 μm or less, and the thickness of the woven synthetic fiber base is thicker than the thickness of the aluminum foil.

In addition, as an example, the thickness of the woven synthetic fiber base may be 30 to 120 μm, the thickness of the aluminum foil may be 5 to 15 μm, and the thickness of the adhesive may be 3 to 10 μm.

Preferably, the woven synthetic fiber base is composed of patterns interwoven with each other, each pattern is repeated in the same shape as the adjacent pattern, the filaments constituting each pattern have the same diameter.

According to the present invention, an uneven shape identical to the uneven shape of the surface of the woven synthetic fiber base is formed over the entire surface of the aluminum foil of the electrically conductive sheet.

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

1 is a cross-sectional view showing an electrically conductive gasket according to an embodiment of the present invention, Figure 2 is an enlarged cross-sectional view of portion A of FIG.

According to the present invention, the aluminum foil 12 is attached to the surface of the woven synthetic fiber base 14 by the adhesive 13 and the electrically conductive sheet having the non-conductive hot melt layer 16 formed on the back surface is uneven. An electrically conductive gasket 10 formed by wrapping polymer sponges 11 such as malleable urethane or latex so as to be continuously overlapped is disclosed.

As the woven synthetic fiber base 14, polyester or nylon fibers may be used. Woven polyester or nylon fibers have a higher tensile strength than natural pulp nonwoven fabrics, paper or other polymer resins, so they do not tear easily and thus protect the aluminum foil 12.

After the electrically conductive sheet is continuously wrapped around the polymer sponge 11 and applied with heat, the hot melt layer 16 melts to serve as an adhesive for bonding the woven synthetic fiber base 14 and the polymer sponge 11. . For example, the hot melt may be an ethylene vinyl acetate (EVA) series.

Preferably, the thickness of the electrically conductive sheet is preferably 150 μm or less, and in particular, the thickness of the woven synthetic fiber base 14 is always thicker than that of the aluminum foil 12 to prevent wrinkles. For example, the thickness of the aluminum foil 12 is 5 to 15 μm, and the thickness of the woven synthetic fiber base 14 is preferably 30 to 120 μm, and the thickness of the adhesive layer 13 may be 3 to 10 μm. have.

Figure 3 is a perspective view showing a woven synthetic fiber base according to an embodiment of the present invention.

In this embodiment, the filaments 14a, 14b, and 14c are interwoven and interwoven in the same pattern three by three, so that each pattern is repeated in the same shape as the adjacent pattern, and the filaments 14a, 14b, and 14c constituting each pattern. The diameter of is the same.

In this way, each pattern is cross-weaved, so that the unevenness is naturally formed even without a separate unevenness forming process, and the synthetic fiber base woven by the characteristics of each filament 14a, 14b, 14c has flexibility.

In addition, since the inexpensive aluminum foil 12 is formed on the woven synthetic fiber base 14, there is an advantage that the manufacturing cost is only about half as compared to a product using the conventional electroless-plated conductive fiber.

In addition, attaching the aluminum foil 12 using an adhesive on the woven synthetic fiber base 14 does not require any special equipment or technology because it is a technique well known in the art. For example, an aluminum foil may be attached to a woven synthetic fiber base by a wet or dry lamination method using, for example, a polyvinyl alcohol (PVA) -based emulsion as an adhesive as a polymer adhesive.

In addition, since it is made of a woven synthetic fiber base and aluminum foil, there is no need for electroless plating in the process of producing the electrically conductive sheet, so that no pollution occurs and does not pollute the environment.

Particularly, in the case of the conductive fiber, the surface electrical resistance is usually 0.05 Ω · cm, whereas in the present invention, the surface electrical resistance is 0.01 Ω · cm or less, so that the electromagnetic shielding effect and the grounding effect are excellent, and the heat transfer is quick. There is this.

Preferably, since the surface of the aluminum foil 12 of the electrically conductive sheet has the same shape as the inner woven synthetic fiber base over the entire surface, as shown in FIG. 2, it has a concave-convex cross section. This uneven shape is the same shape as that of the woven synthetic fiber base 14, and the same shape is formed on the hot melt layer 16 as well.

Due to the woven shape, wrinkles of the electrically conductive sheet can be reduced, and electromagnetic shielding is improved by the effect of increasing the thickness substantially.

Referring to FIG. 1, the electrically conductive gasket 10 according to the present invention inserts a gasket by making a mechanical groove in an object to bond to an object such as an electronic device or a communication device, or a double-sided conductive tape. ) Can be used to attach to the object.

In the above described the center of the preferred embodiment of the present invention, it can be variously changed at the level of those skilled in the art. For example, it may be deformed into a shape suitable for the position to be applied, and it is natural that other elastic members may be used instead of the polymer sponge.

Therefore, in consideration of such modifications and variations, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by the claims described below.

As described above, according to the present invention, an electrically conductive sheet in which an aluminum foil is attached to the surface of the woven synthetic fiber base by using an adhesive and a hot melt layer is formed on the back surface is continuously polymer polymer sponge such as urethane or latex. By forming a wrap so as to overlap, the manufacturing cost can be reduced by about half compared to the plated conductive fiber.

In addition, attaching the aluminum foil with the adhesive on the woven synthetic fiber base does not require any special equipment or technology because it is a technique well known in the art.

In addition, since it is made of woven non-conductive fibers and aluminum foil, no pollution occurs during the manufacture of the electrically conductive sheet, so that it does not pollute the environment.

In addition, by forming the same concave-convex shape as the surface concave-convex shape of the woven fiber over the entire surface of the surface of the electrically conductive sheet, the wrinkles of the conductive sheet can be reduced, and the electromagnetic shielding is effected by the effect of substantially increasing the thickness by this concave-convex shape. There is an advantage that is improved.

In addition, there is an advantage that does not cause skin problems such as allergy to the operator or the user, and the surface does not discolor.

Moreover, there is an advantage that the cut surface is not solved, the electrical resistance is low, and the thermal conductivity is good.

In addition, it is more difficult to tear than paper and good flexibility compared to the film shape can be freely changed.

Moreover, there is an advantage that there is less dust on the surface than using the electroconductive plating with electroless plating.

1 is a cross-sectional view showing an electrically conductive gasket according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of part A of FIG. 1.

Figure 3 is a perspective view showing a woven synthetic fiber base according to an embodiment of the present invention.

Claims (6)

An electrically conductive sheet comprising a woven synthetic fiber base, an aluminum foil adhered to the surface of the woven synthetic fiber base via an adhesive, and a hot melt layer formed on the back surface of the woven synthetic fiber base; And a non-conductive elastic member wrapped continuously and overlapping by said electrically conductive sheet and bonded by said hot melt layer. The electrically conductive gasket of claim 1, wherein the woven synthetic fiber base comprises polyester (PET) or nylon fibers. The electrically conductive gasket of claim 1, wherein the electrically conductive sheet has a thickness of 150 μm or less, and the thickness of the woven synthetic fiber base is greater than the thickness of the aluminum foil. The electrically conductive gasket of claim 3, wherein the thickness of the woven synthetic fiber base is 30 to 120 μm, the thickness of the aluminum foil is 5 to 15 μm, and the thickness of the adhesive is 3 to 10 μm. The method of claim 1, wherein the woven synthetic fiber base is composed of patterns woven cross each other, each pattern is repeated in the same shape as the adjacent pattern, the filaments constituting each pattern has the same diameter Electrically conductive gaskets. The electrically conductive gasket according to any one of claims 1 to 5, wherein an uneven shape identical to the uneven shape of the surface of the woven synthetic fiber base is formed on the surface of the aluminum foil of the electrically conductive sheet. .