Expandable Graphite Thermoplastic Cores for Uniform Loft
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Solution Overview
Problem
Existing composite articles for automotive and construction materials face challenges in achieving uniform loft, enhanced acoustic properties, flame retardancy, and improved processability while meeting stringent performance specifications.
Innovation Solution
Incorporating expandable graphite materials, such as EG particles, into a thermoplastic core layer with reinforcing fibers to enhance thickness, provide flame retardancy, and improve acoustic properties, while maintaining uniform loft and processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If expandable graphite materials are incorporated into the thermoplastic core layer, then thickness is increased and flame retardancy is improved, but uniform loft distribution becomes difficult to achieve
Solution Approach 1:
The patent utilizes the porous structure of expandable graphite particles, which expand uniformly when heated to provide consistent loft distribution throughout the composite article. The porous nature allows for even heat penetration and uniform expansion, resolving the contradiction between achieving uniform loft and increasing thickness with flame retardancy.
Solution Approach 2:
The patent controls the lofting process by adjusting temperature parameters and heating conditions to ensure uniform expansion of graphite particles throughout the thermoplastic core layer. By optimizing the lofting temperature and duration, uniform loft distribution is achieved while maintaining increased thickness and flame retardant properties.
2Reliability
If expandable graphite materials are added to enhance flame retardancy, then fire resistance is improved, but processability may be affected
Solution Approach 1:
The patent optimizes processing parameters including temperature, pressure, and time to accommodate the presence of expandable graphite particles while maintaining ease of manufacture. By carefully controlling these parameters, the patent achieves both improved flame retardancy and preserved processability during manufacturing operations.
3Object-affected harmful factors
If the core layer thickness is increased for better acoustic properties, then sound absorption is improved, but uniform loft becomes more difficult to maintain
Solution Approach 1:
The porous expandable graphite particles provide uniform expansion characteristics that maintain consistent loft distribution even in thicker core layers. This porous structure allows for improved acoustic properties through increased thickness while preventing loft non-uniformity that would normally occur in thicker sections.
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 inclusion of expandable graphite materials results in composite articles with increased thickness, improved flame retardancy, and enhanced acoustic properties, while maintaining uniformity and processability, meeting performance standards like FMVSS 302 flammability tests.
Implementation Method 1
the expandable graphite materials such as particles are effective to increase the thickness of the porous core layer by at least 50% after radiant heating at or above a loft onset temperature of the expandable graphite materials
Implementation Method 2
a porous core layer comprising a web of open celled structures comprising random crossing over of reinforcing fibers held together by a thermoplastic material
Data Source
AI summary
Prepregs, composites and articles comprising expandable graphite materials dispersed in a thermoplastic layer are described. In some instances, a thermoplastic composite article comprises a porous core layer comprising a plurality of reinforcing fibers and a thermoplastic material, and the porous core layer further comprises expandable graphite particles homogeneously dispersed in the porous core layer.