Acoustic Coating for Thin Sound Absorption

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Solution Overview

Problem

Existing acoustic solutions, such as mineral wool-based panels, face challenges in achieving effective sound absorption across a wide frequency range without increasing panel thickness, which also complicates installation and appearance, and lack eco-friendly and fire-resistant properties.

Innovation Solution

A coating composition comprising a natural fibre-bearing dry matter mixture mixed with water, including fine ground fibres, binders, and cellular plastic granules, which forms a durable, thin, and flexible sound-absorbing layer that can be applied to any base, enhancing acoustic and thermal properties while being recyclable and fire-resistant.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If mineral wool-based acoustic panels are used to achieve effective sound absorption, then sound absorption capability is improved, but panel thickness increases and installation complexity increases

Engineering Contradiction:

Improvesound absorptionVSAvoidpanel thickness

Core Design Contradiction:

Object-affected harmful factorsVSLength of stationary object

Solution Approach 1:

The patent uses porous acoustic foam material with specific cell structure to achieve effective sound absorption in a thin profile. The porous structure allows sound waves to penetrate and dissipate energy through friction and viscous effects, providing high sound absorption coefficient without requiring thick panels.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The patent creates a composite coating system combining acoustic foam with fire-resistant additives and binding agents. This composite structure maintains the sound absorption properties of the foam while adding fire resistance and structural integrity, eliminating the need for separate thick mineral wool panels.

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If mineral wool-based acoustic panels are used to achieve effective sound absorption, then sound absorption capability is improved, but installation complexity and appearance quality worsen due to visible seams and cover strips

Engineering Contradiction:

Improvesound absorptionVSAvoidinstallation simplicity

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The acoustic foam coating serves multiple functions simultaneously: sound absorption, fire resistance, and seamless surface coverage. The coating can be applied continuously over large areas without joints, eliminating the need for separate panel installation and cover strips, while maintaining all required acoustic and safety properties.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent extracts the essential sound absorption function from traditional panel structures and implements it through a sprayed coating system. This eliminates the need for discrete panels with seams and cover strips, providing a seamless installation while maintaining acoustic performance.

Inventive Principle:

Principle #2Taking out (Extraction)

3Object-affected harmful factors

If conventional acoustic panels are used, then sound absorption is achieved, but fire safety and environmental sustainability are compromised

Engineering Contradiction:

Improvesound absorptionVSAvoidfire safety

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent incorporates fire-resistant additives and intumescent materials into the acoustic foam coating formulation. These materials convert the potential harm of fire exposure into a protective response, where the coating expands and forms a protective char layer that insulates the underlying substrate and slows combustion, achieving both sound absorption and fire safety.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 coating provides superior sound absorption comparable to or exceeding conventional acoustic wool panels, reduces dust emission, simplifies installation, and meets sustainability and fire safety requirements, allowing for thinner panel structures and improved adhesion without visible seams.

Implementation Method 1

The coating provides superior sound absorption comparable to or exceeding conventional acoustic wool panels

Methodology Applied

Scientific EffectSound absorption: Acoustic Absorption

Implementation Method 2

fine ground fibres, binders, and cellular plastic granules, which forms a durable, thin, and flexible sound-absorbing layer

Methodology Applied

Scientific EffectViscous damping: Viscous Damping

Implementation Method 3

enhancing acoustic and thermal properties

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Data Source

PatentUS9027704B2Coating and its manufacturing process

Publication Date: 2015.05.12 LUMIR

AI summary

A coating composition has a natural fiber-bearing dry matter mixture, as well as cellular plastic grains, mixed into water. By spreading this composition onto any base, particularly by spraying, and by hardening it, particularly through drying, the coating is formed from the coating composition, which coating provides extremely good acoustic properties. If a special fiber base plate based on chemical pulp is used as the base of the coating, the plate-like acoustic element is obtained.