Fiber Laminated Sheet Balancing Soundproofing and Flame Retardancy
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Solution Overview
Problem
Existing sound absorbing bodies are heavy and lack adequate flame retardancy, with insufficient experimental data on their fire resistance.
Innovation Solution
A laminated sheet comprising a first porous layer of inorganic or carbonized fibers for flame retardancy and a second porous layer of organic fibers for soundproofing, bonded together using adhesives or needle punching, with specific thickness, density, and structural orientations to enhance both properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a porous material layer with large thickness is used to improve soundproof performance, then sound absorption capability is enhanced, but weight increases
Solution Approach 1:
The patent combines organic porous material (for sound absorption) with inorganic porous material (for flame retardancy and structural stability) to create a composite laminated structure. This composite approach allows achieving good soundproof performance with reduced thickness and weight compared to using only organic material
Solution Approach 2:
The patent applies different material properties to different layers: the organic porous material layer provides sound absorption, while the inorganic porous material layer provides flame retardancy and structural support. This local differentiation allows each layer to be optimized for its specific function, reducing overall thickness and weight
2Reliability
If conventional porous materials are used to improve sound absorption, then soundproof performance is enhanced, but flame retardancy is insufficient
Solution Approach 1:
The patent creates a composite structure where organic porous material (excellent sound absorption) is laminated with inorganic porous material (excellent flame retardancy). The inorganic layer acts as a protective barrier that maintains flame retardancy while allowing the organic layer to provide sound absorption
Solution Approach 2:
The inorganic porous material layer serves as an intermediary between the sound source and the organic material, providing flame protection while allowing sound waves to pass through to the sound-absorbing organic layer
Data Source
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AI summary
A laminated sheet includes a first porous layer including a plurality of fibers of at least one of inorganic fiber or carbonized fiber; and a second porous layer formed of a plurality of organic fibers, wherein the laminated sheet has a surface density of greater than or equal to 400 g/m2 and less than or equal to 1550 g/m2, wherein the second porous layer is formed of the plurality of organic fibers having a mean diameter of fibers being greater than or equal to 0.5 µm and less than or equal to 14 µm, and wherein, expressing a total volume of solids and voids filling a unit volume of the second porous layer as 100%, a percentage of the solids is greater than or equal to 1.0% and less than or equal to 8.0%.