Polyester non-woven fabric with high sound absorption coefficient and heat insulation pad

Abstract

The polyester non-woven fabric comprises a fluffy non-woven fabric layer and an expanded polytetrafluoroethylene film layer, an inner net layer of the fluffy non-woven fabric layer is formed in a three-dimensional mode with uniform density in the thickness direction, and the upper surface and the lower surface of the fluffy non-woven fabric layer are a compact layer face and an outer layer face respectively. The outer layer surface is connected with the expanded polytetrafluoroethylene film layer, and staggered special-shaped dense micron-sized pore channels are formed in the expanded polytetrafluoroethylene film layer. By means of the mode, the sound absorption and insulation effects on low-frequency noise, intermediate-frequency noise, high-frequency noise and the like are better; the material is light in weight, good in damping elasticity, environment-friendly, free of peculiar smell and capable of being widely used in automotive upholstery to achieve the effects of sound insulation, vibration reduction and cost reduction, so that the riding space in an automobile is enlarged, the noise in the automobile is reduced, and the comfort index of the automobile is improved.

Description

technical field [0001] The invention relates to the field of sound-absorbing materials, in particular to a polyester non-woven fabric with a high sound-absorbing coefficient and a heat-insulating pad. Background technique [0002] Automobile noise is divided into exterior noise and interior noise. The noise outside the vehicle refers to the noise radiated from various parts of the vehicle to the space outside the vehicle, mainly including engine noise, exhaust noise, tire noise, brake noise and drive train noise. The noise in the car refers to the part of the noise of the various parts of the car outside the car that is introduced into the car through various channels, and the noise that the vibration transmission path of the car parts stimulates the structural vibration of the various parts of the car body to radiate into the car. Under the constraints of the acoustic characteristics of the interior space, a relatively complex reverberation sound field is generated, thereb...

AI Technical Summary

Problems solved by technology

At present, a large number of asphalt damping pads are used in automobiles, and the sound insulation effect is poor, which makes the interior of the automobile smelly, and some models have an unpleasant smell

Dizziness and discomfort after a long period of time will affect driving safety

At present, the sound-absorbing cotton (only fluffy cotton) on the market has a small sound absorption coefficient, and the noise reduction effect is average after being used in automobiles. Now the gradient cotton or German sound-absorbing cotton imported from the United States needs to be heavier and thicker to be effective. Obtain a good sound absorption effect, that is, imported gradient cotton and sound-absorbing cotton can no longer meet the higher requirements of car lightweight and car comfort due to increased fuel consumption and compressed effective space in the car

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