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Honeycomb sandwiched sound absorbing and noise reducing structure filled with porous fibers and method of preparing same

A porous fiber, honeycomb interlayer technology, applied in the field of sound absorption and noise reduction, can solve the problems of poor structural performance and poor bearing effect, and achieve the effect of solving the problem of insufficient bearing capacity, excellent sound absorption performance, and convenient use.

Inactive Publication Date: 2018-08-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method often has the problems of poor structural performance and poor bearing effect.

Method used

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  • Honeycomb sandwiched sound absorbing and noise reducing structure filled with porous fibers and method of preparing same
  • Honeycomb sandwiched sound absorbing and noise reducing structure filled with porous fibers and method of preparing same
  • Honeycomb sandwiched sound absorbing and noise reducing structure filled with porous fibers and method of preparing same

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as figure 1 As shown, it is a honeycomb sandwich sound-absorbing and noise-reducing structure filled with porous fibers provided in this embodiment. The honeycomb sandwich sound-absorbing and noise-reducing structure includes an upper skin 1 , a honeycomb sandwich core 2 and a lower skin 3 . The honeycomb core 2 is sandwiched between the upper skin 1 and the lower skin 3 . Each cell of the honeycomb core 2 is filled with PP / PET bicomponent porous fibers 4 , and a plurality of through holes 5 are opened on the upper skin 1 .

[0026] In this embodiment, the honeycomb structure of the honeycomb sandwich core 2 is a regular hexagonal AC-NH meta-aramid paper honeycomb, and its density is about 32kg / m 3 , the cell side length is 5.5mm, and the thickness is 15mm. The mass percentage of PP in the PP / PET bicomponent porous fiber is 20%-80%, the diameter of PP is 5-8 μm, and the diameter of PET is 3-6 μm. The bulk density of the porous fiber is 0.01g / cm 3 -0.05g / cm 3 ....

Embodiment 2

[0037] This embodiment is roughly the same as Embodiment 1, except that the bulk density of the porous fiber filling is changed, and the bulk density of the porous fiber filling becomes 0.03g / cm 3 .

[0038] image 3 It is the sound absorption coefficient figure actually tested in this embodiment. In this embodiment, the sound absorption coefficient NRC of the honeycomb sandwich sound-absorbing structure can reach a maximum of 0.89 at 1KHz, and the effective sound-absorbing bandwidth is 0.7-1.6KHz. This embodiment can achieve a good sound absorption effect in the middle and high frequency bands with a relatively low thickness.

[0039] The invention has the characteristics of simple structure, light weight and high strength, and excellent sound absorption performance at medium and high frequencies, so it has very wide application prospects.

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Abstract

The invention relates to a honeycomb sandwiched sound absorbing and noise reducing structure filled with porous fibers and a method of preparing same. The structure includes an upper skin (1), a honeycomb sandwich core (2), a lower skin (3), PP / PET bi-component porous fibers (4) packed in cells in the honeycomb sandwich core, and micropores (5) uniformly distributed in the upper skin (1). The preparation method includes the steps of: a) preparing a resin base body and manufacturing the upper skin and the lower skin with the composite material, and performing gel solidification; b) uniformly smearing a layer of adhesive on the upper surface of the lower skin, placing the honeycomb sandwich core, pressing the structure with a weight, and performing heating for gel solidification; c) uniformly packing the PP / PET bi-component porous fibers uniformly in the cells in the honeycomb sandwich core, and uniformly smearing a layer of adhesive on one surface of the upper skin, and adhering the upper skin to the honeycomb structure with solidification; d) forming the pores in the upper skin by certain distance. The structure is simple and is light in weight and high in strength, has excellent sound absorbing effect in medium / high frequency, and has great application prospect.

Description

technical field [0001] The invention relates to the field of sound absorption and noise reduction, in particular to a honeycomb interlayer sound absorption and noise reduction structure filled with porous fibers and a preparation method thereof. Background technique [0002] With the continuous improvement of people's consumption awareness, customers have higher and higher requirements for vehicle sound absorption, sound insulation, light weight, comfort, etc., which poses a severe challenge to the selection and design of automotive interior materials. The comfort of the car interior is mainly reflected in functional characteristics such as shock absorption and sound absorption. The current technology generally utilizes some single sound-absorbing and sound-insulating materials to be assembled in some special parts of the vehicle to realize the sound-absorbing and shock-absorbing effects when the car is running, so as to ensure the comfort of the passengers in the car. Howe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/02B32B27/34B32B27/04B32B3/24B32B3/08B32B3/12B32B7/12B32B27/08B32B33/00B32B37/06B32B37/12
CPCB32B3/12B32B3/085B32B3/266B32B5/02B32B7/12B32B27/08B32B33/00B32B37/06B32B37/12B32B2250/24B32B2260/021B32B2260/046B32B2262/0269B32B2307/102B32B2307/558B32B2307/718B32B2605/08B32B2605/10
Inventor 蔡浩鹏瞿航
Owner WUHAN UNIV OF TECH
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