Waterproof Sound-Transmitting Sheet With Segmented Pore-Free And Porous Layers
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Solution Overview
Problem
Conventional waterproof sound-transmitting sheets made of polytetrafluoroethylene porous films degrade over time due to external impacts, leading to reduced waterproof performance and sound transmission efficiency.
Innovation Solution
A waterproof sound-transmitting sheet is manufactured with a porous layer and a pore-free layer, where the porous layer is formed on top and the pore-free layer is formed on the bottom, using electrospinning to create a nano-web structure with fibers and beads, enhancing both sound transmission and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional polytetrafluoroethylene porous film is used as a waterproof sound-transmitting sheet, then sound transmission is enabled, but waterproof performance degrades over time due to micro-pore enlargement from external impacts and sound pressure
Solution Approach 1:
The waterproof sound-transmitting sheet is divided into multiple functional layers: a waterproof base layer (pore-free or low-porosity) and a sound-transmitting porous layer. This segmentation allows each layer to specialize - the base layer provides durable waterproofing while the porous layer handles sound transmission, preventing the degradation issue in single-layer conventional films
Solution Approach 2:
The invention uses composite material structure combining different polymer materials with distinct properties. The waterproof base layer uses materials like polytetrafluoroethylene or ethylene-propylene-diene monomer rubber for water resistance, while the porous layer uses materials optimized for sound transmission. This composite approach maintains waterproof performance while enabling sound passage without the micro-pore enlargement problem
2Reliability
If a porous film structure is used to transmit sound, then sound transmission efficiency is improved, but the film lacks sufficient durability under high-pressure environments
Solution Approach 1:
By separating the waterproof base layer from the sound-transmitting porous layer, the invention allows the porous layer to be optimized for sound transmission efficiency while the robust waterproof base layer provides the necessary strength and durability under high-pressure environments, preventing film deformation and failure
Solution Approach 2:
Different regions of the sheet have different structural properties tailored to their functions. The waterproof base layer has a dense, pore-free or low-porosity structure for strength and pressure resistance, while the porous layer has a high-porosity structure optimized for sound transmission. This local differentiation resolves the contradiction between sound efficiency and durability
3Device complexity
If a single-layer porous film is used, then the structure is simple, but weight and elasticity are insufficient for optimal sound transmission
Solution Approach 1:
The multi-layer composite structure combines lightweight porous materials for sound transmission with thin waterproof base layers, achieving optimal weight balance. The porous layer provides elasticity and sound transmission while the minimal-thickness waterproof base provides necessary protection, resulting in a lightweight overall structure despite the multi-layer configuration
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 resulting sheet is lighter, more elastic, and maintains improved sound transmission and durability under high-pressure environments, preventing sound characteristics from deteriorating.
Implementation Method 1
forming a porous layer having a web structure in which fibers are laminated by intersecting each other by electrospinning the spinning solution
Implementation Method 2
forming a pore-free layer by dissolving a portion of the porous layer adjacent to the one surface of the collecting support with the solvent contained in the spun spinning solution
Data Source
AI summary
A waterproof sound-transmitting sheet is disclosed. The waterproof sound-transmitting sheet comprises: a waterproof sound-transmitting layer having a waterproofing function and configured to transmit a sound; a first adhesive layer attached to a first surface of the waterproof sound-transmitting layer; and a second adhesive layer attached to a second surface of the waterproof sound-transmitting layer, opposite to the first surface, wherein the waterproof sound-transmitting layer comprises: a pore-free layer having no pores; and a porous layer laminated on the pore-free layer and containing pores.