Composite Foam Headliner Structure for Strength and Sound Absorption
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Solution Overview
Problem
There is a need for headliners and other automotive interior components with improved structural, acoustic, and aesthetic performance to enhance the comfort, quietness, and aesthetics of vehicular interiors.
Innovation Solution
A composite foam article comprising a polyurethane foam core with a density of 45 to 80 kg/m3, sandwiched between two skins comprising a plurality of fibers and a polymeric binder, optionally including an ethylene and acrylic acid copolymer layer for enhanced adhesion and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional foam articles are used, then manufacturing is simple, but structural performance and strength are insufficient
Solution Approach 1:
The patent applies composite materials by combining polyurethane foam core with skin layers containing fibers and polymeric binder. This creates a multi-material structure that achieves superior strength and structural performance compared to traditional single-material foam articles, while the skins provide additional structural integrity and aesthetic properties.
Solution Approach 2:
The patent segments the foam article into distinct functional layers: a polyurethane foam core providing structural support and acoustic properties, and outer skin layers providing strength, aesthetics, and durability. This segmentation allows each layer to be optimized for its specific function while working together as an integrated composite structure.
2Strength
If foam density is increased to improve strength, then structural performance improves, but weight increases
Solution Approach 1:
The patent uses composite materials with a lighter density foam core (45-80 kg/m3) combined with strong skin layers containing fibers and polymeric binder. This composite structure achieves the required strength without needing to increase the foam core density, thereby maintaining lower weight while meeting structural performance requirements.
3Volume of moving object
If foam is compressed to reduce thickness, then space efficiency improves, but strength and firmness decrease
Solution Approach 1:
The patent employs composite materials where the skin layers containing fibers and polymeric binder maintain structural integrity during compression. The foam core can be compressed to reduce thickness while the reinforcing skins prevent excessive deformation and maintain strength, allowing the composite structure to achieve both reduced thickness and retained strength.
Solution Approach 2:
The segmented structure allows the foam core to be optimized for compression and thickness reduction while the skin layers are optimized for maintaining strength during and after compression. This functional segmentation enables the core to provide space efficiency while the skins provide structural support under compressed conditions.
4Object-affected harmful factors
If porosity is maintained for acoustic properties, then sound absorption improves, but structural strength decreases
Solution Approach 1:
The patent combines porous polyurethane foam material that provides excellent sound absorption and acoustic properties with dense skin layers containing fibers and polymeric binder that provide structural strength. The composite structure allows the porous foam core to maintain acoustic functionality while the solid skin layers compensate for the reduced strength that would result from porosity.
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 composite foam article provides improved strength, stiffness, and sound absorption, offering a firm feel and superior performance characteristics compared to traditional foam articles, while maintaining porosity for enhanced acoustic properties.
Implementation Method 1
A first skin is disposed on the first surface and a second skin is disposed on the second surface. The first and second skins comprise a plurality of fibers and a polymeric binder.
Implementation Method 2
The composite foam article provides improved strength, stiffness, and sound absorption, offering a firm feel and superior performance characteristics compared to traditional foam articles, while maintaining porosity for enhanced acoustic properties.
Implementation Method 3
the polyurethane foam core, the first skin, and the second skin have a pre-compression thickness of from about 2 to about 5 mm, and are compressed to form the composite foam article having a strength of greater than about 17 N at a post-compression thickness of greater than about 2 mm
Data Source
AI summary
A composite foam article is disclosed herein. The composite foam article comprises a polyurethane foam core presenting a first surface and a second surface facing opposite the first surface. A first skin is disposed on the first surface and a second skin is disposed on the second surface. The polyurethane foam core has a density of 15-80 kg/m3. The first and second skins comprise a plurality of fibers and a polymeric binder. The composite foam article has a weight per unit area of 500-1000 g/m2 and a strength of greater than 17 N at a post-compression thickness of greater than 2 mm when tested in according with SAE J949 at 23° C.