Noise Absorbing Fabric With Metal Processing
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Solution Overview
Problem
Existing noise absorbing materials face challenges with reflection of electromagnetic waves, limited noise absorption across a wide frequency band, difficulty in incorporating into intricate electronic components, and high costs due to the use of expensive soft magnetic materials.
Innovation Solution
A noise absorbing fabric with metal processing on at least one side, featuring a common logarithmic surface resistivity within 0 to 4, lower electrical conductivity inside than on the surface, and a non-woven fabric structure with synthetic long fibers, allowing for efficient absorption of electromagnetic waves across a wide band without reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If soft magnetic powder is dispersed in resin to create noise absorbing sheets, then noise absorption performance is improved, but the sheets become thick and difficult to wind into rolls for continuous production
Solution Approach 1:
The invention changes the physical state of the magnetic material from powder to thin film form, and alters the matrix material from rubbery resin to plastic resin. This parameter change enables the noise absorbing sheet to achieve both high noise absorption performance and thin profile (0.1-1.0mm thickness), resolving the contradiction between performance and thickness.
Solution Approach 2:
The invention creates a composite material system combining plastic resin matrix with dispersed magnetic powder particles. This composite structure allows the magnetic particles to be uniformly distributed at high concentrations within the plastic matrix, achieving both high noise absorption performance and processability for continuous production and rolling.
2Reliability
If soft magnetic powder with high specific gravity is used to improve noise absorption, then noise absorption performance is enhanced, but the sheets become thick and difficult to incorporate in confined locations
Solution Approach 1:
The invention changes the matrix material from rubbery substance to plastic resin, which has different rheological and processing properties. This enables the creation of thin sheets (0.1-1.0mm) with high magnetic particle concentration, achieving both high noise absorption performance and reduced thickness for use in confined locations.
3Reliability
If complex composition and structure of soft magnetic material is used to accommodate higher frequencies, then noise absorption at higher frequencies is improved, but costs increase
Solution Approach 1:
The invention changes the particle morphology from simple spherical or irregular shapes to needle-shaped or scale-shaped magnetic particles. This morphological parameter change enhances the magnetic anisotropy and polarization of the particles, improving noise absorption performance at higher frequencies while maintaining cost-effectiveness by avoiding complex multi-element compositions.
4Reliability
If soft magnetic materials are used to absorb noise at specific frequencies, then noise absorption at those frequencies is improved, but it is difficult to use these materials to absorb noise over a wide band
Solution Approach 1:
The invention creates a composite material system combining plastic resin matrix with needle-shaped or scale-shaped magnetic particles. The anisotropic morphology of the magnetic particles, combined with their dispersion in the plastic matrix, creates multiple scattering centers and magnetic domains that broaden the frequency response, enabling effective noise absorption over a wide frequency band rather than at single specific frequencies.
5Reliability
If multiple layers and lamination are used to enhance noise absorption performance, then noise absorption performance is improved, but the sheets become increasingly thick and difficult to use
Solution Approach 1:
The invention changes the matrix material from rubbery resin to plastic resin, which enables higher concentrations of magnetic particles to be incorporated while maintaining structural integrity. This allows achieving high noise absorption performance in a single thin layer (0.1-1.0mm) rather than requiring multiple thick layers, thus improving performance without increasing overall thickness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The fabric effectively absorbs electromagnetic waves without reflection, is flexible and thin for use in intricate components, and is cost-effective without requiring expensive soft magnetic materials, demonstrating superior noise absorption performance.
Implementation Method 1
the common logarithmic value of the surface resistivity of the surface subjected to metal processing is within the range of 0 to 4
Implementation Method 2
The noise absorbing fabric of the present invention is not susceptible to reflection of electromagnetic waves and has superior noise absorbing ability
Data Source
AI summary
An object of the present invention is to provide a noise absorbing fabric in which electromagnetic waves are not susceptible to being reflected and which has superior noise absorbing ability, a noise absorbing fabric having noise absorbing ability across a wide band, a noise absorbing fabric that is soft, highly flexible, thin, and can be incorporated in intricate portions of electronic components or housings and the like by being bent or folded and the like, and a noise absorbing fabric that can be easily and stably produced without using an expensive soft magnetic material, is inexpensive and demonstrates high performance. In the noise absorbing fabric, a metal is subjected to metal processing on at least one side of a fabric, and the common logarithmic value of the surface resistivity of the surface subjected to metal processing is within the range of 0 to 4.