Waterproof Sound-Transmitting Sheet with Electrospun Nanoweb
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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, compromising their ability to protect electronic devices from water and dust.
Innovation Solution
A waterproof sound-transmitting sheet comprising a support layer and a waterproofing layer formed as a porous nanoweb using electrospinning with polyvinylidene difluoride (PVDF), where the waterproofing layer is exposed externally to enhance waterproofing and easily adjustable thickness for improved sound transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a porous polytetrafluoroethylene film is used as a waterproof sound-transmitting sheet, then sound transmission is enabled, but the micropores are enlarged by external impact or sound pressure over time, deteriorating waterproofing performance
Solution Approach 1:
The invention uses a composite structure consisting of a polytetrafluoroethylene resin layer and a porous layer. The porous layer acts as a reinforcement that prevents the micropores of the polytetrafluoroethylene film from enlarging under external impact or sound pressure, thereby maintaining both sound transmission and waterproofing performance over time.
Solution Approach 2:
The invention employs a porous layer with controlled porosity (30-70%) that maintains the micropore structure stability. This porous layer allows sound transmission while preventing the enlargement of micropores that would compromise waterproofing, resolving the contradiction between maintaining pore structure and allowing sound passage.
2Ease of operation
If the thickness of the waterproof sound-transmitting sheet is increased to improve durability, then handling becomes more difficult, but if thickness is decreased for ease of handling, then protective performance may be compromised
Solution Approach 1:
The invention applies local quality by creating distinct layers with different functions: the polytetrafluoroethylene resin layer provides waterproofing and sound transmission, while the porous layer provides structural reinforcement. This allows the sheet to be thin and easy to handle while maintaining protective performance through the functional specialization of each layer.
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 enhanced waterproofing performance and ease of handling with adjustable thickness, ensuring effective protection against water and dust while maintaining sound transmission efficiency for electronic devices.
Implementation Method 1
the waterproofing layer may be formed by applying a polymer material onto the support layer using electrospinning
Data Source
AI summary
Disclosed herein is a waterproof sound-transmitting sheet, the thickness of which can easily be adjusted and which has a high sound transmitting efficiency and excellent waterproofness, and a method for producing same. The waterproof sound-transmitting sheet, which is attached to a sound hole of a case, includes: a support layer made of a film-shaped porous material and formed in the case; and a waterproofing layer formed on one side of the support layer in the shape of a porous nanoweb in which fine fiber strands are crosswisely layered and exposed to the outside of the case.