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Sound-absorbing felt

A sound-absorbing and sound-absorbing layer technology, used in building components, sound insulation, layered products, etc., can solve the problems of poor low-frequency sound absorption effect, and achieve good sound absorption effect, good fire resistance and flame retardancy, and flexible fibers. Effect

Active Publication Date: 2018-12-14
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
Comparison scheme
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 arranged in layers. The first sound-absorbing layer is obtained by using polyacrylonitrile pre-oxygen fiber through acupuncture process, and the surface density is 5kg / m 2 , the thickness is 1cm; the second sound-absorbing layer is also obtained by acupuncture process with polyacrylonitrile pre-oxygen fiber, and the surface density is 1.5kg / m 2 , thickness 4cm.

[0032] During acupuncture, the barbed hook on the needle drives the fibers on the surface and subsurface of the main layer of the polyacrylonitrile pre-oxidized fiber to move from the plane direction of the main layer to the vertical direction, so that the fibers are displaced up and down and the extension direction changes. , forming a polyacrylonitrile pre-oxygen fiber cluster with an extension direction of 85-95° to the main layer.

[0033] The polyacrylonitrile pre-oxygen f...

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 arranged in layers. The first sound-absorbing layer is obtained by using polyacrylonitrile pre-oxygen fiber through acupuncture process, and the surface density is 2kg / m 2 , the thickness is 2cm; the second sound-absorbing layer is also obtained by acupuncture process with polyacrylonitrile pre-oxygen fiber, and the surface density is 3kg / m 2 , thickness 3cm.

[0037] The polyacrylonitrile pre-oxygen fiber used in this embodiment has a length ranging from 6 to 12 cm and a diameter of 11 to 20 μm.

[0038] 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 is 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 arranged in layers. The first sound-absorbing layer is obtained by using polyacrylonitrile pre-oxygen fiber through acupuncture process, and the surface density is 1.5kg / m 2 , the thickness is 3cm; the second sound-absorbing layer is also obtained by acupuncture process with polyacrylonitrile pre-oxygen fiber, and the surface density is 4kg / m 2 , thickness 2cm.

[0041] During acupuncture, the barbed hook on the needle drives the fibers on the surface and subsurface of the main layer of the polyacrylonitrile pre-oxidized fiber to move from the plane direction of the main layer to the vertical direction, so that the fibers are displaced up and down and the extension direction changes. , forming a polyacrylonitrile pre-oxygen fiber cluster with an extension direction of 85-95° to the main layer.

[0042] The polyacrylonitrile pre-oxygen...

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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 awareness of environmental protection of the people and the stricter laws and regulations related to environmental protection have led to an increasing demand for noise control in substations, and higher and higher noise reduction standards. Commonly used substation noise control methods mainly include "sound absorption, sound insulation, and noise reduction", of 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 that when sound is transmitted to the surface of the material, part of the sound energy is reflected, part of it penetrates the material,...

Claims

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Application Information

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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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