Multiwall Sheet Sound Insulation via Acoustic Impedance
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Solution Overview
Problem
Multiwall sheets face challenges in achieving increased sound insulation without significant weight gain, maintaining transparency, and minimizing manufacturing costs and steps.
Innovation Solution
Incorporating a sound insulating material with a velocity of sound greater than the plastic walls and an acoustic impedance of at least 5 MRayl into the cavities of multiwall sheets, specifically using materials like silica, to enhance sound transmission loss and absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the weight of the multiwall sheet is increased to improve sound insulation, then sound insulation properties are improved, but weight savings and cost-effectiveness are compromised
Solution Approach 1:
The patent utilizes the multiwall sheet's inherent porous cavity structure to accommodate sound insulating material. The cavities between walls serve as porous spaces that can be filled with acoustic materials having specific acoustic impedances, allowing sound insulation improvement without adding significant weight compared to solid materials.
Solution Approach 2:
The patent creates a composite structure by filling the cavities with sound insulating material that has different acoustic properties (higher acoustic impedance) than the plastic walls. This composite approach combines the lightweight advantage of plastic with the sound insulation benefits of denser materials, resolving the contradiction between weight and sound insulation.
2Object-affected harmful factors
If sound insulating material is added to improve sound transmission loss, then sound insulation is improved, but manufacturing complexity increases
Solution Approach 1:
The multiwall sheet is pre-formed with cavities during the extrusion process, creating ready-to-fill spaces for sound insulating material. This preliminary structuring allows for subsequent simple filling operations, avoiding the need for complex post-manufacturing assembly steps and reducing overall manufacturing complexity.
Solution Approach 2:
The sound insulating material is nested within the pre-formed cavities of the multiwall sheet structure. This nesting approach allows the sound insulating material to be accommodated within the existing structural framework without requiring additional external components or complex assembly procedures.
3Object-affected harmful factors
If transparent multiwall sheet is designed for sound insulation, then sound insulation properties are improved, but transparency is compromised
Solution Approach 1:
The patent applies local quality by filling only specific cavities with sound insulating material while leaving other cavities empty or partially filled. This selective filling allows different regions of the multiwall sheet to have different properties - some areas provide sound insulation while other areas maintain transparency, resolving the contradiction between these two requirements.
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
This approach results in a significant increase in sound transmission loss, up to 500% improvement, while maintaining transparency and reducing weight, thus addressing the need for improved sound insulation in lightweight, cost-effective multiwall sheets.
Implementation Method 1
a sound insulating material disposed in an area between two adjacent walls; wherein the sound insulating material has a velocity of sound greater than the velocity of sound of the plastic walls
Implementation Method 2
wherein the sound insulating material has an acoustic impedance of greater than or equal to 5 MRayl
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A multiwall sheet (10) comprises plastic walls, wherein the walls comprise a first wall (12); a second wall (14); and a transverse wall (16), wherein the first wall (12), the second wall (14), and the transverse wall (16) extend longitudinally; and a rib (18) extending between adjacent walls; and a sound insulating material disposed in an area between two adjacent walls, wherein the sound insulating material has a velocity of sound greater than the velocity of sound of the plastic walls.