Closed-Cell Foam Sound Insulation in Panel Sandwiches
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Solution Overview
Problem
Existing panel sandwiches for walls, ceilings, and floors face challenges with sound-insulation durability and cost-effectiveness, as expensive materials like cork lose insulation quickly, and cheap materials like polyurethane foam are not permanently elastic.
Innovation Solution
A method using a closed-cell foam with a compression modulus of 0.25 MPa to 1.5 MPa and bulk density of 75 kg/m³ to 350 kg/m³, integrated into a panel sandwich with a base board and cover board, providing a permanently elastic sound-insulating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cork is used as a sound-insulating layer, then sound-insulation performance is improved, but manufacturing cost increases significantly
Solution Approach 1:
The patent changes the physical and chemical parameters of the foam material by specifying a closed-cell structure with cell sizes between 0.1 mm and 2.0 mm, and bulk density between 75 kg/m³ and 350 kg/m³. These parameter changes enable the foam to achieve sound-insulation properties comparable to cork while maintaining cost-effectiveness through industrial mass production
Solution Approach 2:
The patent uses composite material construction by combining wood-based panels (chipboard, OSB, or MDF) with closed-cell foam as the sound-insulating layer. This composite approach allows the foam to fulfill the sound-insulation function previously requiring expensive cork, while the wood panels provide structural support, achieving both performance and cost objectives
2Ease of manufacture
If polyurethane foam is used as a sound-insulating layer, then manufacturing cost decreases, but sound-insulation durability deteriorates due to loss of elasticity
Solution Approach 1:
The patent specifies critical parameter ranges for the closed-cell foam: bulk density between 75 kg/m³ and 350 kg/m³, and cell size between 0.1 mm and 2.0 mm. These parameter constraints ensure the foam maintains permanent elasticity and resists deformation over time, preventing the rapid loss of sound-insulation properties while remaining cost-effective for mass production
Solution Approach 2:
The patent employs closed-cell foam as a porous material with specifically controlled cell structure (0.1 mm to 2.0 mm cell sizes). The closed-cell configuration provides both the cost advantage of foam materials and the durability required for long-term service life, as the closed cells prevent material degradation and maintain elastic recovery capability throughout the panel's service life
3Reliability
If cork is used as a sound-insulating layer, then sound-insulation performance is improved, but service life decreases due to rapid loss of elastic properties
Solution Approach 1:
The patent defines specific parameter ranges for the closed-cell foam (bulk density: 75-350 kg/m³, cell size: 0.1-2.0 mm) that optimize both sound-insulation performance and long-term durability. These parameters ensure the foam maintains its elastic properties throughout the panel's service life, unlike cork which degrades rapidly
Solution Approach 2:
The patent replaces expensive, short-lived cork with inexpensive closed-cell foam that provides long-lasting performance. The foam's closed-cell structure prevents the rapid degradation seen in cork, while its lower cost and availability enable industrial mass production, achieving both economic and durability objectives
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 closed-cell foam maintains effective sound-insulation throughout the panel's service life, resisting external influences and ensuring long-lasting acoustic performance without significant cost, making the panel sandwiches cost-effective and easily integratable into conventional manufacturing processes.
Implementation Method 1
arranging a sound-insulating layer above the base board... using an elastic plastic material to produce the sound-insulating layer... a closed-cell foam is arranged as the sound-insulating layer
Implementation Method 2
which has a compression modulus of elasticity of 0.25 MPa to 1.5 MPa... Another advantage of closed-cell foams is that they remain particularly permanently elastic
Implementation Method 3
a closed-cell foam is arranged as the sound-insulating layer... the majority of the cells of the foam forming a non-communicating system. No gas can be exchanged directly between the cells... prevents, for example at least as far as possible, the absorption of moisture by the foam from the environment
Data Source
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AI summary
The method involves providing a base plate (20) made of wood material. A sound-insulating layer (18) and a cover plate (22) are placed above the base plate. The sandwich is pressed in a press. An elastic plastic material (18c) for forming the sound-insulating layer is used. A closed cellular foam is arranged as the elastic plastic material or a self-adhesive plastic material is applied as the elastic plastic material. The base plate is connected with the cover plate.