PTFE Membrane Cladding for Traffic Sound Barrier Durability

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current sound barrier materials, such as organic or inorganic fibers and porous foamed plastics, are not resistant to outdoor environmental climate, particularly ultraviolet radiation, leading to premature aging and loss of sound-absorption function.

Innovation Solution

A high-sound-absorption composite material for traffic sound barriers is developed, comprising a porous sound-absorption material layer clad with an expanded polytetrafluoroethylene microporous membrane or its modified version, providing a sealed connection to enhance durability and sound absorption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If organic or inorganic fibers with fiber aggregate structure, porous foamed plastics, expanded perlite products, glass wool, or mineral wool are used for sound absorption, then sound-absorption function is achieved, but resistance to outdoor environmental climate and ultraviolet radiation is poor, leading to premature aging and loss of function

Engineering Contradiction:

Improveservice lifeVSAvoidultraviolet radiation damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies a PTFE microporous membrane as a thin film cladding layer that envelops the sound-absorbing material. This membrane acts as a protective shell that allows sound waves to pass through while blocking ultraviolet radiation and environmental factors, thereby extending the service life of the sound-absorbing core material without compromising its acoustic function.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent creates a composite structure combining a sound-absorbing material layer (organic or inorganic fibers, porous foamed plastics, etc.) with a PTFE microporous membrane layer. This composite material integrates the sound-absorption properties of the core material with the UV resistance and environmental stability of the PTFE membrane, achieving both acoustic performance and durability.

Inventive Principle:

Principle #40Composite materials

2Reliability

If sound barrier height is increased to improve noise reduction, then noise isolation effectiveness increases, but wind load and collision safety requirements become more stringent

Engineering Contradiction:

Improvenoise reduction effectivenessVSAvoidwind load

Core Design Contradiction:

ReliabilityVSForce

Solution Approach 1:

The PTFE microporous membrane provides a flexible, lightweight cladding that reduces the overall weight and structural burden of the sound barrier while maintaining acoustic effectiveness. This allows for optimized structural design that can better withstand wind loads and collision forces compared to heavier, more rigid constructions.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent divides the sound barrier into functional layers: a sound-absorbing core material layer and a protective PTFE membrane cladding layer. This segmentation allows each layer to be optimized independently - the core for acoustic performance and the membrane for environmental resistance and structural lightness - thereby addressing both noise reduction and structural safety requirements.

Inventive Principle:

Principle #1Segmentation

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 composite material effectively reduces noise levels to 60-75 dB, offering improved sound isolation, extended service life, environmental friendliness, fire retardancy, and waterproofing, while maintaining stability and ease of installation.

Implementation Method 1

the surface of the porous sound-absorption material layer is clad with the cladding layer in a sealing way, while the clad parts and joints are in sealed connection

Methodology Applied

Scientific EffectPhysical containment through sealed cladding: Physical Containment

Implementation Method 2

A high-sound-absorption composite material for traffic sound barriers is provided including a porous sound-absorption material layer

Methodology Applied

Scientific EffectSound absorption: Acoustic Absorption

Data Source

PatentUS9771693B2High-sound-absorption composite material for traffic sound barriers and preparation method thereof

Publication Date: 2017.09.26 PAN ASIAN MICROVENT TECH JIANGSU CORP

AI summary

The present invention discloses a high-sound-absorption composite material for a traffic sound barrier. The surface of a porous sound-absorption material layer is clad with a cladding layer in a sealing way, and the clad parts and joints are in sealed connection. The cladding layer is an expanded polytetrafluoroethylene microporous membrane or a modified membrane of the expanded polytetrafluoroethylene microporous membrane. A preparation method is disclosed, comprising the following steps of cutting the porous sound-absorption material; covering the surface of the porous sound-absorption material with the expanded polytetrafluoroethylene microporous membrane or the modified membrane of the expanded polytetrafluoroethylene microporous membrane; performing sealed connection on the clad parts and joints. By the above approach, the present invention is able to greatly reduce noise, has a soundproof function and a better sound-absorption function, has a prolonged service life, and features environmental protection, flame retardancy, damp-proofing and high plasticity.