Electrospun Polymer Coating for Waterproof Sound-Transmitting Sheets
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Solution Overview
Problem
Conventional waterproof sound-transmitting sheets, such as those made of porous polytetrafluoroethylene films, suffer from deteriorating waterproofing performance due to enlarged micropores from external impacts or sound pressure, and struggle to balance sound transmission efficiency with waterproofing.
Innovation Solution
A nonporous waterproof sound-transmitting sheet is developed using a polymer material, like PVDF, formed into a web structure through electrospinning, with a coating layer on both sides to block surface pores, achieved via gravure, dipping, or spray processes, ensuring low air permeability and adjustable thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a porous polytetrafluoroethylene film is used for waterproof sound transmission, then sound transmission efficiency is improved, but waterproofing performance deteriorates over time due to enlarged micropores from external impacts or sound pressure
Solution Approach 1:
The invention uses a composite structure consisting of a porous polytetrafluoroethylene film layer and a non-porous polymer coating layer. The coating layer is formed by electrospinning polymer material to create a web structure that blocks the micropores of the underlying porous film, combining the sound transmission properties of the porous structure with the waterproofing properties of the non-porous coating.
Solution Approach 2:
The invention utilizes a porous polytetrafluoroethylene film as the base layer that provides sound transmission pathways while maintaining waterproofing. The porous structure allows sound waves to pass through while the electrospun coating layer seals the pores to prevent water penetration.
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 solution provides improved waterproofing and sound transmission efficiency by maintaining the sheet's integrity and allowing for easy thickness adjustment, enhancing both waterproofing and sound characteristics.
Implementation Method 1
the sound-transmitting layer is formed by electrospinning the polymer material
Implementation Method 2
the coating layer may be formed on at least one side of the sound-transmitting layer using any one selected from among a gravure coating process
Implementation Method 3
the coating layer may be formed on at least one side of the sound-transmitting layer using any one selected from among a gravure coating process, a dipping process
Data Source
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AI summary
Disclosed herein is a waterproof sound-transmitting sheet having high sound transfer efficiency and excellent water proofing performance and a method for producing same. The waterproof sound-transmitting sheet includes: a sound-transmitting layer made of a polymer material and formed in the shape of a web having a plurality of pores; and a coating layer formed on at least one side of the sound-transmitting layer to block pores existing on the surface of the sound-transmitting layer.