JP2502467Y2 - Flexible sheet for preventing electrical and electromagnetic interference - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible sheet for preventing electric and electromagnetic interference, which can effectively prevent electric and electromagnetic interference.

[0002]

2. Description of the Related Art Conventionally, flexible sheets made of various synthetic resins or synthetic or natural rubber have been used as flexible covering materials for equipment covers and the like.
Many of these are reinforced with fiber materials. However, these sheets are electrically insulative in nature, typically 10 ¹⁰ to 10 ¹⁷ Ω · cm, often 10 ¹² Ω · cm.
It had the above specific resistance value. Therefore, these conventional sheets generate static electricity due to surface friction,
There was a strong tendency to be charged.

With the recent development and widespread use of various electric devices, the occurrence of static electricity and electromagnetic interference due to static electricity generation and electrification of the flexible sheet has been increasing, and a drastic solution to this problem is strongly required. Came.

In the case of such a flexible sheet, it is conceivable that the purpose can be achieved by applying a conductive paint or the like on the surface of a normal non-conductive sheet.
In that case, the adhesiveness of the conductive paint to the surface of the sheet becomes a problem, and the flexible sheet is easily bent due to severe bending, and it is difficult to obtain a sheet having a sufficient practical use life. . In addition, when applying a conductive paint, there are many problems in terms of hue and it is difficult to obtain a colorful sheet, and there are problems such as the coating technique and the performance of the coating film. It was difficult to form a flexible film.

Further, even if only one side of the sheet is made conductive, if the opposite side is insulative, the opposite side is easily charged with static electricity. Therefore, the electromagnetic shielding and charging due to only the conductive side is carried out. In terms of prevention, it could not be used in applications where electrostatic charging is extremely disliked.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a flexible sheet that does not generate static electricity and is not charged, and therefore does not generate electric and electromagnetic interference.

[0007]

The flexible sheet for preventing electrical and electromagnetic interference of the present invention is a two-layer or three-layer conductive or semi-conductive flexible sheet portion having a specific resistance value of less than 10 ⁸ Ω · cm. And one or two layers of electrical power which are inserted / laminated between the two or three layers of conductive or semiconductive flexible sheet portions and have a specific resistance value of 10 ¹⁰ Ω · cm or more. A laminate having an insulative flexible sheet portion, wherein both front and back surfaces of the laminate are formed by the conductive or semi-conductive flexible sheet portion, and the conductive or semi-conductive flexible sheet portion. Is an electrically insulating polyvinyl chloride, polyurethane, ethylene-vinyl acetate copolymer, polypropylene,
Polyethylene, polyacrylonitrile, polyester,
And a conductive material contained in the matrix component and at least one selected from the group consisting of polyamide, and the insulating material.
Sex full lexical table seat is electrically insulating polyvinyl chloride, polyurethane, ethylene - vinyl acetate copolymer, polypropylene, polyethylene, polyacrylonitrile,
It is characterized by being formed from at least one selected from polyester and polyamide.

[0008]

The flexible sheet for preventing electric and electromagnetic interference according to the present invention comprises one or two layers of electrically insulating flexible sheet portions and two or three layers of electrically conductive or semi-conductive layers alternately laminated and bonded. And a flexible flexible sheet portion, and the front and back surfaces of this laminated body are each formed by one layer of the conductive or semi-conductive flexible sheet portion. The specific resistance value of the insulating flexible sheet portion used in the present invention is 10 ¹⁰ Ω · cm or more, preferably 10 ¹⁰ to 10 ¹⁸ Ω · cm.

The conductive or semi-conductive flexible sheet portion used in the present invention has a specific resistance value of 10 ⁸ Ω · cm.
However, the conductive flexible sheet portion having a specific resistance value of 10 ⁵ Ω · cm or less is preferable. In this case, the specific resistance value may be 10 ¹ Ω · cm or less, if necessary. .

In the electric and electromagnetic interference prevention flexible sheet of the present invention, each of the insulating sheet and the conductive or semiconductive sheet is required to be flexible. In the flexible sheet for preventing electric and electromagnetic interference of the present invention, both front and back surfaces thereof are formed by a conductive or semiconductive flexible sheet portion, and between the front surface and the back surface conductive or semiconductive flexible sheet portion, A sheet-like substrate composed of one layer of insulating flexible sheet portion, or of two layers of insulating flexible sheet portion and one layer of conductive or semi-conductive flexible sheet portion inserted and laminated between them. Are sandwiched and laminated.

The conductive or semi-conductive flexible sheet portion used in the present invention is formed by blending a conductive material in a matrix made of synthetic resin and adjusting the specific resistance value of this blend to a predetermined value.

As described above, an electrically insulating synthetic resin is used for the matrix of the electrically conductive or semi-conductive flexible sheet portion and the insulative flexible sheet portion constituting the flexible sheet for preventing electric and electromagnetic interference of the present invention. This electrically insulating synthetic resin is polyvinyl chloride (PV
C), polyurethane, ethylene-vinyl acetate copolymer,
It is selected from isotactic polypropylene, polyethylene, polyacrylonitrile, polyester and polyamide. The most preferred synthetic resin is PVC, which may include plasticizers, fillers, colorants, stabilizers, blowing agents and / or other modifiers. Further, depending on the use or purpose, these synthetic resin materials may contain bubbles or may be porous.

The conductive material mixed in the matrix of the conductive or semi-conductive flexible sheet portion to control its specific resistance value to a desired value is liquid, powder, fibrous or foil-like. , Linear or sheet-like conductive material such as carbon black, metal such as Al, Au, Ag, Pt, Cu, Cr, Ni, Zn, T
i, Pb, Sn, Pd and their compounds or Ni-Cr
Alloys or other conductive compounds such as indium oxide. The amount of the conductive substance blended is determined in consideration of the conductivity unique to the substance, the property and the desired degree of conductivity, but is preferably at least 5% by weight,
More preferably, it is 70% by weight. Of course, the compounding amount of the conductive substance is not limited to 70% by weight or less, and particularly in the case of the conductive flexible sheet portion, desired flexible sheet properties (strength, flexibility, appearance, etc.)
May be more than 70% by weight, as long as it has For reference, the specific resistance values of various materials are shown below.

Material resistivity (Ω · cm) Natural asphalt 10 ¹⁵ to 10 ¹⁷ Vulcanized natural rubber 10 ¹⁵ to 10 ¹⁷ Butyl rubber 10 ¹⁵ to 10 ¹⁶ SBR 10 ¹² Polyisoprene 10 ¹⁵ Ethylene-propylene rubber 10 ¹⁵ to 10 ¹⁶ Neoprene 10 ¹⁰ to 10 ¹² Chlorosulfonated polyethylene rubber 10 ¹⁴ Urethane rubber 10 ¹⁴ to 10 ¹⁵ Polyethylene terephthalate 10 ¹⁹ Nylon 6 10 ¹² to 10 ¹⁵ Nylon 66 10 ¹³ to 10 ¹⁴ Polypropylene 10 ¹⁶ Polyvinyl chloride 10 ¹⁶ to 10 ¹⁷ no MEC paper 10 ¹⁶ cotton ¹⁰⁷ 10 ¹² carbon black, graphite 10 ⁰ to 10 ^-3 stainless steel ^10-4 to ^-6

The thickness of each of the insulating flexible sheet portion and the conductive or semi-conductive flexible sheet portion is not particularly limited as long as it does not impair the flexibility of the flexible sheet for preventing electric and electromagnetic interference, but is generally 1 μm. It is preferably 10 to 1
The thickness is more preferably 000 μm, but may be thicker than this.

The flexible sheet for preventing electric and electromagnetic interference of the present invention, which is made of the above-mentioned materials, is as described above.
The conductive or semi-conductive flexible sheet portion and the insulative flexible sheet portion are combined, and the structure of the electric and electromagnetic wave interference prevention flexible sheet will be described in more detail with reference to the accompanying drawings.

1 and 2 are cross-sectional views schematically showing an example of a flexible sheet for preventing electric and electromagnetic interference according to the present invention in the accompanying drawings. The flexible sheet for preventing electrical and electromagnetic interference shown in FIG.
A sheet-like base body made of an insulating flexible sheet portion 1 is provided with conductive or semi-conductive flexible sheet portions 2 on both sides.

In the flexible sheet for preventing electric and electromagnetic interference shown in FIG. 2, the sheet-like substrate 1a has two layers of insulating flexible sheet portion 1 and one layer of conductive material inserted or laminated between them, or It is composed of the semi-conductive flexible sheet portion 2a, and the conductive or semi-conductive flexible sheet portion 2 is arranged on both front and back surfaces thereof, and these are integrated. The flexible sheet for preventing electric and electromagnetic interference according to the present invention having the structure shown in FIG. 2 improves the safety and reliability of the flexible sheet for preventing electric and electromagnetic interference, even if the environmental conditions on the front and back sides of the flexible sheet are different. This is a particularly preferable embodiment.

In the production of the flexible sheet for preventing electric and electromagnetic interference of the present invention, a conductive or semi-conductive sheet (or film) may be laminated on both surfaces of an insulating sheet (or film) and united. Alternatively, a conductive or semi-conductive coating film forming liquid may be applied to both surfaces of the insulating sheet (film) and solidified.

In order to carry out the above steps, calendering method, topping method, dipping method, coating method,
A laminating method, an extrusion molding method, a spreading method, and any other method can be used.

Further, as shown in FIG. 1, the outer surface 2 is formed by a conductive or semi-conductive flexible sheet portion 2, and the sheet-shaped substrate therein is an insulating flexible sheet portion 1.
It can also be formed only. In this case, the seat has a structure that conforms to the required performance of the upper surface and the lower surface during use, and does not cause problems such as clinging during handling.

As shown in FIG. 2, it is composed of two layers of insulating flexible sheet portion 1 and one layer of conductive or semi-conductive flexible sheet portion 2a sandwiched and laminated between them. In the case of an electric and electromagnetic interference prevention flexible sheet comprising a sheet-shaped substrate 1a having a conductive sheet and a conductive or semi-conductive flexible sheet portion covering both front and back surfaces thereof, the conductive flexible sheet portion on both outermost surfaces of the front and back surfaces. 2 have antistatic and electromagnetic wave blocking functions, respectively, and the insulating flexible sheet portion 1 below
Prevents leakage, and the conductive flexible sheet portion 2a (central layer) underneath blocks electromagnetic waves to prevent the failure,
The insulating flexible sheet portion 1 thereunder further improves the electrical insulation of the flexible sheet for preventing electric and electromagnetic interference of the present invention. Therefore, the electrical condition loaded (or generated) on one of the conductive or semi-conductive flexible sheet portions on the outermost surfaces of the front and back does not interlock with the other, and the static electricity prevention and the electromagnetic wave independent of each other. The effect of obstacle prevention can be improved. Therefore, the electric and electromagnetic wave interference preventing flexible sheet of the present invention having this structure may be used under different electrical conditions on the front and back sides. For example, even when the flexible sheet for preventing electric and electromagnetic interference of the present invention is used as a work sheet, it is possible to prevent electrical changes or troubles on the outer surface from affecting electric equipment or the human body in contact with the inner surface. it can.

The present invention will be described below with reference to embodiments.

[0024]

EXAMPLE One example of the flexible sheet for preventing electric and electromagnetic interference of the present invention is an insulating sheet containing 100 parts by weight of polyvinyl chloride resin, 60 parts by weight of dioctyl phthalate, and a predetermined amount of stabilizer. Created. The insulating sheet was a flexible sheet having a thickness of about 0.25 mm. The specific resistance value of this insulating sheet was 10 ¹⁶ Ω · cm.

Next, a conductive processing liquid containing 100 parts by weight of polyvinyl chloride resin and 250 parts by weight of carbon black is applied to both sides of the above-mentioned insulating sheet and dried, 180
A heat treatment for gelation was carried out at 0 ° C. to form a conductive flexible sheet portion having a thickness of about 0.1 mm on each side and a specific resistance of 10 ⁴ to 10 ⁶ Ω · cm. The total thickness of the obtained flexible sheet for preventing electric and electromagnetic interference is about 0.5.
It was mm.

When a simple box was made in the laboratory using this flexible sheet for preventing electric and electromagnetic interference, and sewing work was performed using a high-frequency sewing machine in it, no noise was generated on the television screen that was lit just outside. There wasn't. For comparison, a similar test was conducted using a conventional PVC sheet, but the TV screen was disturbed. In the test conducted with the conventional PVC sheet only subjected to the antistatic treatment, the TV screen was also disturbed.

Further, the flexible sheet for preventing electric and electromagnetic interference does not generate static electricity and is not charged on either of the front and back surfaces of the flexible sheet. For example, troubles such as electric discharge and electric leakage can be blocked, and the flexible sheet as a whole could be safely and effectively put into practical use without troubles such as charging, electric discharge and electric leakage.

[0028]

[Effects of the Invention] The flexible sheet for preventing electric and electromagnetic interference of the present invention prevents electrostatic charging on both front and back surfaces, does not cause electromagnetic interference, has no danger of electric leakage to the back side, and has a surface friction. Even if it is used for, it has an extremely epoch-making composite effect that can maintain the above electrical characteristics with good durability. Therefore, this electric and electromagnetic wave interference-preventing flexible sheet has a surprising advantage that it is suitable for versatile use by itself, and is of great industrial value. Furthermore, since this flexible sheet for preventing electric and electromagnetic interference is flexible, it can be applied to any article in its original shape, and can be sewn into any shape for use. , It is possible to supply a great variety of products easily.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a flexible sheet for preventing electric and electromagnetic interference according to the present invention.

FIG. 2 is a sectional view showing another example of the flexible sheet for preventing electric and electromagnetic interference of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Insulating electric flexible sheet part 1a ... Sheet-shaped substrate 2, 2a ... Conductive or semi-conductive flexible sheet part

Claims (6)

(57) [Scope of utility model registration request] 1. A two-layer or three-layer conductive or semi-conductive flexible sheet portion having a specific resistance value of less than 10 ⁸ Ω · cm, and the two-layer or three-layer conductive or semi-conductive flexible sheet. It is inserted and laminated between layers of parts, and 1
A laminate having one or two layers of electrically insulating flexible sheet having a specific resistance value of 0 ¹⁰ Ω · cm or more, wherein the front and back surfaces of the laminate each have one layer of the conductive material. Or, it is formed by a semi-conductive flexible sheet portion, and the conductive or semi-conductive flexible sheet portion is an electrically insulating polyvinyl chloride, polyurethane, ethylene-acetic acid.
Vinyl copolymer, polypropylene, polyethylene, poly
The insulating flexible sheet part comprises a matrix component consisting of at least one selected from acrylonitrile, polyester and polyamide, and a conductive substance contained in the matrix component. But an electrically insulating poly salt
Vinyl chloride, polyurethane, ethylene-vinyl acetate copolymer
Body, polypropylene, polyethylene, polyacrylonit
A flexible sheet for preventing electric and electromagnetic interference, which is formed of at least one selected from rill, polyester, and polyamide . 2. The flexible sheet for preventing electric and electromagnetic interference according to claim 1, wherein the conductive flexible sheet portion has a specific resistance value of 10 ⁵ Ω · cm or less. 3. The flexible sheet for preventing electric and electromagnetic interference according to claim 1, wherein the insulating flexible sheet portion has a specific resistance value of 10 ¹⁰ to 10 ¹⁸ Ω · cm. 4. The flexible sheet for preventing electrical and electromagnetic interference according to claim 1, wherein the content of the conductive material is at least 5% by weight with respect to the conductive or semi-conductive flexible sheet portion. 5. The flexible sheet for preventing electric and electromagnetic interference according to claim 4, wherein the content of the conductive substance is 10 to 70% by weight. 6. The conductive material is carbon black,
The flexible sheet for preventing electric and electromagnetic interference according to claim 1, which is selected from a conductive metal, a conductive alloy and a conductive metal compound.