Elastomer-Modified Bituminous Damping for Building Panel Acoustics

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Solution Overview

Problem

Existing building construction methods to reduce unwanted airborne and impact noise transmission, such as using acoustic insulating materials or laminated panels, increase material and labor costs while compromising on room size and sound insulation performance.

Innovation Solution

The strategic application of elastomer-modified bituminous material in the form of elongate bands on building panels, specifically positioned to coincide with maximum displacement points during resonance, acts as a damping layer without extending to the perimeter edges, thereby reducing resonance and sound transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If acoustic insulating materials are sandwiched between two plasterboard layers, then sound transmission is reduced, but material and labor costs increase and room size decreases

Engineering Contradiction:

Improvesound transmissionVSAvoidmaterial cost

Core Design Contradiction:

Object-affected harmful factorsVSQuantity of substance

Solution Approach 1:

The invention extracts the essential damping function from complex multi-layer acoustic insulation systems and implements it through a single elastomer-modified bituminous material layer applied to one plasterboard face, eliminating the need for sandwich constructions while maintaining acoustic performance

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention changes the material parameter by using elastomer-modified bituminous material with specific viscoelastic properties (loss factor tan δ ≥ 0.15 at 100 Hz) that provides acoustic damping equivalent to or better than traditional multi-layer systems, achieving the same sound transmission reduction with less material

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If acoustic insulating materials are sandwiched between two plasterboard layers, then sound transmission is reduced, but room size decreases due to increased thickness

Engineering Contradiction:

Improvesound transmissionVSAvoidpanel thickness

Core Design Contradiction:

Object-affected harmful factorsVSLength of stationary object

Solution Approach 1:

The invention removes the need for thick sandwich constructions by extracting the damping function into a single thin layer of elastomer-modified bituminous material applied to one face, significantly reducing the overall thickness of the acoustic insulation system

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention uses a thin film or layer of elastomer-modified bituminous material (thickness ≥ 0.15 mm) that provides acoustic damping functionality without the bulk of traditional insulation materials, maintaining acoustic performance while minimizing thickness

Inventive Principle:

Principle #30Flexible shells and thin films

3Object-affected harmful factors

If Green Glue viscoelastic compound is applied to reduce sound transmission, then acoustic performance improves, but material cost increases by two thirds and manual effort increases

Engineering Contradiction:

Improvesound transmissionVSAvoidapplication complexity

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The invention changes the material form from curable compounds requiring precise application to pre-formed elastomer-modified bituminous material layers that can be directly installed, eliminating the need for manual extrusion and curing processes

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses pre-manufactured elastomer-modified bituminous material layers that can be applied as complete, ready-to-use components, replacing the need for repetitive manual application of curable compounds and eliminating associated labor costs

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 enhances sound insulation performance by up to 2-3 dB without increasing panel thickness or material usage, offering cost savings and improved acoustic efficiency.

Implementation Method 1

a layer is coupled to one of the panel faces wherein the layer is of elastomer-modified bituminous material coupled to a panel face in an unconstrained manner

Methodology Applied

Scientific EffectViscoelastic damping: Viscoelasticity

Implementation Method 2

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentEP2809852B1Building construction panels

Publication Date: 2015.12.02 ICOPAL A S

Figure 1
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Figure 3a~4b

AI summary

The invention relates to the suppression of acoustic transmission through building construction panels such as rectangular plasterboard panels. A layer of elastomer- modified bituminous material is coupled to part of the surface area of one of the panel faces so as to coincide with its regions of maximum displacement during resonance at its fundamental frequency. The elastomer-modified bituminous material acts as an unconstrained damping layer to reduce the displacement, and hence the noise, produced by the panel. In an alternative embodiment, the layer of elastomer-modified bituminous material is sandwiched between two superimposed construction panels. The invention provides significant improvements in terms of noise propagation whilst using fewer materials.