Expanded PTFE Composite Fiber Cotton for Full-Frequency Noise Absorption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current sound absorption materials for automobiles, particularly those used in the domestic market, are ineffective in reducing noise pollution across a full-frequency range, leading to discomfort and increased risk of accidents due to noise-related fatigue.
Innovation Solution
A high sound absorption coefficient expanded PTFE composite fiber cotton is developed, comprising a melt-blown high polymer fibrous layer and an expanded PTFE film layer, which are combined through various methods such as heating, ultrasonic welding, or using an adhesive, to create a material with enhanced sound attenuation capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sound absorbing materials are used in automobiles, then the material structure is simple and easy to manufacture, but the sound absorption effectiveness is insufficient especially at low and medium frequencies
Solution Approach 1:
The patent applies composite materials by combining melt-blown high polymer fibrous non-woven fabric with expanded PTFE film. This composite structure integrates the sound absorption capabilities of fibrous materials with the acoustic properties of expanded PTFE, achieving enhanced full-frequency sound absorption particularly at low and medium frequencies while maintaining manufacturing feasibility
Solution Approach 2:
The patent utilizes porous materials by incorporating expanded PTFE film with a specific porosity of 30-80%. The porous structure allows sound waves to penetrate and dissipate energy through friction and viscous effects, significantly improving sound absorption effectiveness across the full frequency range while managing the complexity through controlled pore structure
2Reliability
If sound absorbing materials are applied to automobiles, then noise reduction effectiveness improves, but the cost increases due to import dependence
Solution Approach 1:
The patent applies parameter changes by optimizing the porosity of expanded PTFE film to 30-80% and controlling the thickness parameters of both the fibrous non-woven fabric and PTFE film layers. These parameter optimizations achieve high noise reduction effectiveness while enabling domestic production, thereby reducing manufacturing costs and eliminating import dependence
3Reliability
If expanded PTFE film is used alone for sound absorption, then chemical inertness and waterproofing are achieved, but sound absorption coefficient is insufficient
Solution Approach 1:
The patent merges the melt-blown high polymer fibrous non-woven fabric layer with the expanded PTFE film layer into a composite structure. The fibrous layer provides enhanced sound absorption coefficient through its porous network, while the expanded PTFE film maintains chemical inertness and waterproofing properties, achieving synergistic performance
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 material effectively absorbs noise across a full-frequency range, significantly reducing noise levels in automobiles, providing a comfortable driving experience while offering additional benefits like chemical inertness, waterproofing, and long service life.
Implementation Method 1
The energy of sound is attenuated as noise passes through the porous materials of micro-fine fiber and causes friction. By reducing the propagation of sound energy through the reflected echo waves of composite non-woven fabric or aluminum film, sound absorption materials with the micro-fine fiber technology convert most noise energy into heat
Implementation Method 2
The energy of sound is attenuated as noise passes through the porous materials of micro-fine fiber and causes friction
Implementation Method 3
sound absorption materials with the micro-fine fiber technology convert most noise energy into heat, substantially reducing the noise in automobiles
Data Source
AI summary
The present invention discloses a high sound absorption coefficient expanded PTFE composite fiber cotton, comprising a melt-blown high polymer fibrous layer and an expanded PTFE film layers or a modified film layer of expanded PTFE, the modified film layer of expanded PTFE is made by conducting modification treatment to a PTFE film; the high sound absorption efficiency expanded PTFE composite fiber cotton is made by combining the melt-blown high polymer fibrous layer and the expanded PTFE film layer or the modified film layer of expanded PTFE. Thus, the present invention with better full-frequency sound absorption capability and marked full-frequency sound absorption effect can be bound in a large area or filled on automobiles' engine hoods, body racks or the inner side face of automobile trunks to substantially absorb automobile noise; it has advantages such as chemical inertness, waterproof, dustproof, permeable filterability, long service life and weldability.