Multimaterial Sheet Acoustic Insulation via Density Layering
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Solution Overview
Problem
There is a need for multiwall sheets that provide increased sound insulation without a significant increase in weight, while also maintaining transparency and not impacting the overall cost.
Innovation Solution
The development of multimaterial sheets comprising layers of different materials with varying densities, specifically a first layer of high-density plastic, a second layer of glass or ceramic, a third layer of multiwall sheet, and a fourth layer of plastic, stacked along a y-axis to achieve enhanced sound transmission loss.
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 increases which counteracts the weight savings of using polymer sheeting
Solution Approach 1:
The patent employs a composite structure consisting of multiple layers with different materials and densities (lightweight polymer layers, intermediate density layers, and heavy metal layers). This composite approach enables the sheet to achieve high sound insulation performance through the synergistic effect of density differences and acoustic impedance variations, while maintaining overall lightweight characteristics compared to traditional glass or solid polymer sheets.
Solution Approach 2:
The invention applies local quality by strategically placing high-density metal layers only at specific positions within the multiwall structure where they are most effective for sound insulation. The majority of the sheet structure remains composed of lightweight polymer materials, achieving optimal sound blocking at critical frequencies without uniformly increasing the weight of the entire sheet.
2Object-affected harmful factors
If the weight of the multiwall sheet is increased to improve sound insulation, then sound insulation properties are improved, but overall cost increases
Solution Approach 1:
The composite structure allows cost-effective sound insulation by using thin layers of expensive high-density materials (such as lead or steel) only where acoustically necessary, combined with abundant use of cheaper lightweight polymers. This optimizes the cost-performance ratio by minimizing the quantity of expensive materials while achieving the required sound insulation performance.
Solution Approach 2:
The invention utilizes parameter changes by varying the thickness and density of different layers to optimize sound insulation across multiple frequency ranges. By adjusting these parameters, the design achieves broad-spectrum sound blocking effectiveness without requiring excessive material quantity, thereby controlling manufacturing costs.
3Object-affected harmful factors
If a transparent multiwall sheet is designed to achieve desired sound insulation properties, then sound insulation is improved, but it becomes difficult to maintain both sound insulation and transparency
Solution Approach 1:
The patent applies local quality by confining opaque or translucent high-density sound-blocking layers to specific zones within the multiwall structure, such as edge regions or intermittent layers, while leaving other areas transparent. This allows the sheet to provide effective sound insulation at critical locations while maintaining overall visual transparency for natural lighting applications.
Solution Approach 2:
The invention segments the multiwall sheet into distinct functional zones: transparent polymer layers for light transmission and localized high-density layers for sound blocking. This segmentation enables each layer to perform its specific function optimally, with transparent sections maintaining illumination and dense sections providing acoustic protection, thereby resolving the contradiction between transparency and sound insulation.
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 multimaterial sheet design achieves a surprisingly high sound transmission loss, effectively reducing sound pollution with minimal weight increase, while maintaining transparency and cost-effectiveness.
Implementation Method 1
Disclosed herein are multimaterial sheets and methods for making and using the same which include layers of different materials of differing densities. The disclosed multimaterial sheets including layers of different materials of differing densities display a surprisingly high sound transmission loss.
Data Source
AI summary
A multimaterial sheet includes a first layer (10) comprising a first plastic and having a density of 2.000-5.000 kilograms per cubic meter; a second layer (20) comprising a second plastic, glass, ceramic, or a combination thereof and having a density of 800-5,000 kilograms per cubic meter, wherein the second layer (20) is spaced apart (15) from the first layer (10); a third layer (30) comprising a multiwall sheet and having a density of 50-250 kilograms per cubic meter, or 60-200 kilograms per cubic meter; and a fourth layer (40) comprising a third plastic and having a density of 800-2.000 kilograms per cubic meter, wherein the first layer, the second layer, the third layer, and the fourth layer are stacked along a y-axis.