Noise-absorbing sheet

A noise-absorbing, fabric-based technology, applied in the field of noise-absorbing sheets, can solve the problems of superimposed noise-absorbing performance, expensive materials, and low noise-absorbing performance, and achieve excellent noise-absorbing performance, excellent flexibility, and high noise-absorbing effect.

Inactive Publication Date: 2016-07-13
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This noise-absorbing fabric exhibits a high effect on removing electric field noise among noise components, but its noise-absorbing effect on magnetic field components is inferior to that of a noise-absorbing sheet in which the above-mentioned soft magnetic material is dispersed in resin
[0010] In addition, in order to impart effects on electric field noise components, a noise absorbing sheet in which a soft magnetic material is dispersed in a resin and a so-called electromagnetic wave shield such as a metal foil or a metal processing fabric has been composited has also been developed (see below). Patent Documents 3 and 4), but the electromagnetic wave shield has very high conductivity, so the reflection component increases and the noise absorption performance decreases
In addition, there is a possibility that the electromagnetic wave shield itself becomes an antenna, causing secondary radiation of noise, and sometimes causing unexpected adverse effects on electronic equipment
[0011] Furthermore, there has also been proposed a noise absorbing sheet that suppresses the reflection of the above-mentioned electromagnetic waves by laminating an electromagnetic wave-absorbing film instead of the above-mentioned electromagnetic wave shield and a layer in which a soft magnetic substance is dispersed in a resin, the electromagnetic wave-absorbing film It consists of a plastic film processed with metal and carbon nanotubes (see Patent Document 5 below), but this electromagnetic wave absorbing film requires complicated processing steps in order to express its electromagnetic wave absorbing performance
In addition, the material is also expensive, so the cost of the product is very high
In addition, with regard to the noise absorption performance, the respective noise absorption performances of the plastic film layer and the magnetic layer were superimposed, and no significant improvement in the noise absorption effect was observed.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0186] A spun-bonded non-woven fabric made of polyester resin (product name: Pureshize, product number: AS030) produced by Asahi Kasei Fiber Co., Ltd. manufactured by the production method shown below was used as the fabric, and metal processing was performed, and a commercially available magnetic sheet was used. Paste, and measure the noise absorption performance.

[0187] For general-purpose polyethylene terephthalate, the long fiber group of the filament is extruded to the moving collection surface at a spinning temperature of 300°C by the spunbonding method, and the spinning is carried out at a spinning speed of 3500m / min. Corona electrification makes it charge about 3μC / g to fully open the fiber, and the basis weight on the collecting mesh surface is about 7.5g / m 2 An unbonded long-fiber sheet (hereinafter sometimes referred to as "sheet layer A") formed of filaments having an average fiber diameter of 11 μm and having a uniformity of 5 cm change rate of 15% or less was f...

Embodiment 2～24

[0198] Using the above-mentioned Example 1 as the basic condition, the configuration / properties of the noise absorbing fabric and the magnetic sheet were changed. The points of change are shown in Table 1 and Table 2 below.

[0199] In Example 2, as the commercially available magnetic sheet of Example 1, a magnetic sheet manufactured by Doosung Corporation was used.

[0200] In Example 3, as the commercially available magnetic sheet of Example 1, a magnetic sheet (thickness: 100 μm) manufactured by NEC-TOKIN was used.

[0201] In Example 4, as the commercially available magnetic sheet of Example 1, a magnetic sheet (thickness: 50 μm) manufactured by 3M was used.

[0202] In Example 5, the vapor deposition time was changed to change the thickness of the metal, and it followed Example 1 except that.

[0203] Example 6 follows Example 1 except that the metal is changed to Ag.

[0204] Example 7 Followed Example 1 except that the base material of the noise absorbing fabric was ...

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Abstract

Provided is a noise-absorbing sheet that is highly effective at absorbing noise from magnetic and / or electric fields, the noise-absorbing effect being effective in wider bandwidths. A noise-absorbing sheet upon which at least two layers are stacked, wherein the noise absorbing sheet is characterized in that a magnetic body layer containing a magnetic material and a layer of a noise-absorbing fabric in which a metal is deposited on constituent fibers are layered on said sheet, and the common logarithmic value of the surface resistivity of at least one side of the noise-absorbing fabric is 0 to 6.

Description

technical field [0001] The present invention relates to a noise absorbing sheet capable of absorbing conduction noise and radiated noise of electronic equipment, particularly radiated noise in a high-frequency band, which can be effectively absorbed. Background technique [0002] With the widespread use of electronic equipment such as personal computers and large-screen TVs, mobile phones, and wireless communication equipment such as wireless LANs, the amount of information to be processed has increased significantly. Therefore, these electronic devices and wireless communication devices are becoming more high-capacity, highly integrated, and high-speed communication, and the demand for faster processing and more efficient transmission of the increased amount of information is increasing. In order to meet these demands, the clock frequency of LSI (large scale integration) and the transmission frequency used by electronic equipment are shifted to the higher frequency side, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00B32B5/08D04H3/16
CPCD04H1/4374H05K9/0075H05K9/0083H05K9/0084H05K9/009B32B5/02B32B5/22B32B5/30B32B2260/025B32B2262/103B32B2264/105B32B2307/20B32B2307/208B32B2457/00D04H3/14D04H1/43835D04H1/43838B32B5/08D04H3/16B32B5/022H05K9/0088
Inventor 田中智也冈村知恵冈嶋真一川村知之加藤一史
Owner ASAHI KASEI KK
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