a sound-absorbing felt

A sound-absorbing and sound-absorbing layer technology, which is applied in the field of sound-absorbing materials, can solve the problems of low-frequency sound-absorbing effect, etc., and achieve good sound-absorbing effect, avoid damp subsidence, and fiber flexibility

Active Publication Date: 2020-11-13
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the disadvantage of poor low-frequency sound absorption effect of the sound-absorbing felt structure made of environmentally friendly materials in the prior art, and to provide a new type of sound-absorbing felt

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0031] This embodiment provides a sound-absorbing felt, which is composed of a first sound-absorbing layer and a second sound-absorbing layer that are stacked. The first sound-absorbing layer is obtained by acupuncture with polyacrylonitrile pre-oxidized fibers, and the surface density is 5kg / m 2 , thickness 1cm; the second sound-absorbing layer is also made of polyacrylonitrile pre-oxidized fiber through acupuncture process, with a surface density of 1.5kg / m 2 , thickness 4cm.

[0032] When acupuncture is performed, the barbed hook on the needle drives the fibers on the surface and subsurface of the main layer of the polyacrylonitrile preoxygenated fiber to move from the plane direction of the main layer to the vertical direction, causing the fibers to shift up and down and change the extension direction. , forming polyacrylonitrile pre-oxidized fiber clusters whose extension direction is 85-95° to the main body layer.

[0033] The polyacrylonitrile preoxygenated fibers used...

Embodiment 2

[0036] This embodiment provides a sound-absorbing felt, which is composed of a first sound-absorbing layer and a second sound-absorbing layer that are stacked. The first sound-absorbing layer is obtained by acupuncture with polyacrylonitrile pre-oxidized fibers, and the surface density is 2kg / m 2 , with a thickness of 2cm; the second sound-absorbing layer is also made of polyacrylonitrile pre-oxidized fiber for acupuncture, with an area density of 3kg / m 2 , thickness 3cm.

[0037] The polyacrylonitrile preoxygenated fibers used in this embodiment have a length ranging from 6 to 12 cm and a diameter of 11 to 20 μm.

[0038] When in use, the first sound-absorbing layer faces the sound source as the side close to the sound source, and the second sound-absorbing layer as the side away from the sound source.

Embodiment 3

[0040] This embodiment provides a sound-absorbing felt, which is composed of a first sound-absorbing layer and a second sound-absorbing layer that are stacked. The first sound-absorbing layer is obtained by acupuncture with polyacrylonitrile pre-oxidized fibers, and the surface density is 1.5kg / m 2 , with a thickness of 3cm; the second sound-absorbing layer is also made of polyacrylonitrile pre-oxidized fiber for acupuncture, with a surface density of 4kg / m 2 , thickness 2cm.

[0041] When acupuncture is performed, the barbed hook on the needle drives the fibers on the surface and subsurface of the main layer of the polyacrylonitrile preoxygenated fiber to move from the plane direction of the main layer to the vertical direction, causing the fibers to shift up and down and change the extension direction. , forming polyacrylonitrile pre-oxidized fiber clusters whose extension direction is 85-95° to the main body layer.

[0042] The polyacrylonitrile preoxygenated fibers used...

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Abstract

The invention belongs to the field of silencing materials, and particularly relates to a novel sound-absorbing felt. The sound-absorbing felt provided by the invention uses preoxidized polyacrylonitrile fiber as a sound-absorbing material for the first time, so as to obtain the novel sound-absorbing felt; not only the sound-absorbing felt has better acoustic performance than that of a glass wool product, but also the fiber is flexible and free of breakage, an environment pollution problem is avoided, and the sound-absorbing felt is friendly to the health of an operator; in addition, the sound-absorbing felt provided by the invention has good fire resistance and flame retardance, has an oxygen index of 50 or above, and is significantly better than other organic fibers. The preoxidized polyacrylonitrile fiber (shortened as preoxidized fiber) used by the sound-absorbing felt is an intermediate product in carbon fiber production. High-performance carbon fiber has an extremely high performance requirement on the preoxidized polyacrylonitrile fiber, a large amount of waste fiber is produced in the production process, and the waste fiber is used as a raw material for fiber sound-absorbingfelt production, so that the production cost is effectively reduced; a sound-absorbing layer produced from the preoxidized polyacrylonitrile fiber can play a very good sound-absorbing effect on a low-frequency sound source and meets a special noise-reducing need of a substation.

Description

technical field [0001] The invention belongs to the field of sound-absorbing materials, and in particular relates to a novel sound-absorbing felt. Background technique [0002] The increasing environmental protection awareness of the people and the stricter laws and regulations related to environmental protection make the demand for noise control in substations increase day by day, and the noise reduction standards are getting higher and higher. Commonly used substation noise control methods mainly include "sound absorption, sound insulation, and noise elimination", among which sound absorption is one of the key control links. Sound-absorbing materials can be classified into "porous resistive sound-absorbing materials" and "resonant sound-absorbing materials" according to the principle of sound absorption. The principle of porous resistive sound absorption is: when the sound is transmitted to the surface of the material, part of the sound energy is reflected, part of the so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/02B32B27/12B32B27/30E04B1/84
CPCB32B5/02B32B5/26B32B2262/0246B32B2307/10B32B2307/3065B32B2307/54B32B2307/558E04B1/8409
Inventor 聂京凯陈益坪田一金晓锋卢纯义陈新韩钰金文德孔晓峰朱全军王斌樊超王广克刘晓圣何强侯东
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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