Fiber Carpet Backing Composition for Noise and Compression Resistance
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Solution Overview
Problem
Existing vehicular carpet constructions face challenges in achieving effective noise abatement and compression resistance while reducing costs, as they rely heavily on expanded polypropylene foam pads, which are costly and have limitations in acoustic and compression performance.
Innovation Solution
A fiber composition comprising binder fiber and vehicular carpet waste regrind is used as a backing layer, replacing expanded polypropylene foam, with specific ratios and properties to enhance sound absorption, transmission loss, and compression resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If expanded polypropylene foam pads are used for noise abatement and compression resistance, then acoustic performance and compression resistance are improved, but material cost increases
Solution Approach 1:
The patent changes the material parameters by using a fiber composition with specific density (20-200 kg/m³) and thickness (3.0-100.0 mm) ranges, along with controlled binder fiber content (30-75 wt%), to achieve the required compression resistance and noise abatement performance while using lower-cost materials compared to expanded polypropylene foam pads
Solution Approach 2:
The patent employs a composite fiber composition consisting of binder fibers and vehicular carpet waste regrind in specific ratios. This composite material combines the binding properties of binder fibers with the structural characteristics of recycled carpet fibers to create a cost-effective alternative that meets both acoustic and compression performance requirements
2Reliability
If expanded polypropylene foam pads are used for noise abatement, then sound absorption performance is improved, but material cost increases
Solution Approach 1:
The patent optimizes the density and thickness parameters of the fiber composition backing layer to achieve superior sound absorption performance. By controlling these physical parameters within specific ranges and combining them with appropriate binder fiber content, the invention achieves sound absorption coefficients greater than 0.70 over the frequency range 400 Hz to 1000 Hz while using cost-effective materials
Solution Approach 2:
The patent incorporates vehicular carpet waste regrind as a primary component of the fiber composition. This recycling approach not only reduces material costs compared to virgin expanded polypropylene foam but also provides effective noise abatement performance, transforming waste material into a valuable acoustic component
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 fiber composition achieves improved sound absorption, transmission loss, and compression performance, outperforming expanded polypropylene foam, while maintaining or exceeding OEM compression testing requirements and reducing material costs.
Implementation Method 1
a sound absorption coefficient of greater than 0.70 over the frequency range 400 Hz to 1000 Hz
Implementation Method 2
The fiber composition comprises binder fiber and vehicular carpet waste regrind
Data Source
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AI summary
The present invention is directed at fiber compositions for noise abatement and compression resistance for vehicular applications. More particularly, the fiber compositions are suitable to replace expanded polypropylene foam pads utilized in vehicular carpet applications.