Porous Sheet Lamination for Durable Low-Frequency Sound Absorption
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Solution Overview
Problem
Existing sound-absorbing members made of porous bodies face challenges in achieving both excellent sound-absorbing performance in low frequencies and durability, as excessive compression for thickness reduction compromises joining and durability, while light compression fails to enhance sound-absorbing performance effectively.
Innovation Solution
A method involving the lamination and compression of multiple sheet-like materials, including porous bodies, with controlled thickness reduction and adhesive application, to form a compressed body with specific compressibility and adhesive strength, ensuring both sound-absorbing performance and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compression is performed to firmly join sheet-like materials, then joining strength and durability are improved, but thickness is excessively reduced and sound-absorbing performance becomes insufficient
Solution Approach 1:
The patent applies parameter changes by controlling the compression ratio to be within 10% to 90% and specifying a temperature range of 10°C to 200°C for compression. This allows the adhesive to activate and bond sheet-like materials effectively while preventing excessive thickness reduction that would compromise sound-absorbing performance. The controlled parameter changes enable simultaneous achievement of joining strength and acoustic functionality.
Solution Approach 2:
The patent uses composite materials by layering multiple sheet-like materials including porous bodies and resin films through compression with adhesive. This laminated structure combines the sound-absorbing properties of porous materials with the bonding strength of compressed layers, achieving both durability and sound-absorbing performance without excessive thickness reduction.
2Object-affected harmful factors
If compression is performed lightly to prevent reduction in thickness, then sound-absorbing performance is maintained, but joining between sheet-like materials becomes insufficient and practical durability is not obtained
Solution Approach 1:
The patent resolves this contradiction by establishing specific parameter ranges: compression ratio of 10% to 90% and temperature of 10°C to 200°C. These controlled parameters ensure sufficient adhesive activation for strong joining while preventing excessive thickness reduction that would compromise sound-absorbing performance. The parameter control allows light-to-moderate compression that achieves both goals simultaneously.
3Weight of stationary object
If thickness of sound-absorbing member is reduced for space saving and weight reduction, then practical requirements are met, but sound-absorbing performance at low frequency becomes insufficient
Solution Approach 1:
The patent employs composite materials in a laminated structure combining porous bodies and resin films. This composite approach enables thin yet effective sound-absorbing members where the porous materials provide acoustic functionality and the resin films provide structural integrity and bonding, achieving both weight reduction and maintained sound-absorbing performance at low frequencies.
Solution Approach 2:
The patent utilizes porous materials (porous bodies) as key components in the laminated structure. These porous materials provide excellent sound-absorbing performance at low frequencies while having low density for weight reduction. The porous structure absorbs sound waves through viscous dissipation in the pores, achieving effective acoustic performance without excessive thickness or weight.
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 method achieves a sound-absorbing member with enhanced performance in low frequencies and sufficient durability by incorporating a porous structure and adhesive strength, maintaining thickness while ensuring practical durability.
Implementation Method 1
a compression step of compressing a plurality of sheet-like materials layered via an adhesive in a thickness direction thereof
Implementation Method 2
in order to reduce noise from a noise source, a porous body such as a nonwoven fabric or a resin foam is used as a sound-absorbing member
Implementation Method 3
at least one of the plurality of sheet-like materials is a porous body
Data Source
AI summary
A method for manufacturing a sound-absorbing member formed by laminating a plurality of sheet-like materials includes a compression step of compressing a plurality of sheet-like materials layered via an adhesive in a thickness direction thereof to obtain a compressed body, in which at least one of the plurality of sheet-like materials is a porous body, and a thickness of at least one of the sheet-like materials being a porous body in the compressed body is 70 to 99% of a thickness before compression.