Layered Transparent Thermoplastic for Aircraft Window Flammability
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Solution Overview
Problem
Current transparent materials used in commercial aircraft windows do not meet Federal Aviation Administration (FAA) requirements for flammability resistance, specifically in heat release, vertical burn, smoke emissions, and toxic fume emissions tests, limiting the size of windows for aesthetic purposes while maintaining transparency and scratch resistance.
Innovation Solution
A layered material is created by combining a thin, flame-resistant polymeric outer layer with a thicker, transparent polymeric inner layer, formed through co-lamination or co-extrusion processes, meeting FAA and Ohio State University heat release test standards, and providing durability and scratch resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a thick transparent polymeric material is used to maintain transparency and mechanical properties, then transparency and strength are improved, but flammability resistance deteriorates
Solution Approach 1:
The patent divides the single transparent material into two separate layers: an inner transparent polymeric material providing optical clarity and mechanical strength, and an outer flammable polymeric material providing flame resistance. This segmentation allows each layer to independently fulfill its specific function without compromising the other properties.
Solution Approach 2:
The patent creates a composite layered structure combining two different polymeric materials with complementary properties. The inner material (e.g., polycarbonate) provides transparency and strength, while the outer material provides flame resistance, achieving a composite effect that neither material could achieve alone.
2Reliability
If a thin flammable polymeric material is used to meet flame resistance requirements, then flammability resistance is improved, but transparency deteriorates
Solution Approach 1:
The patent separates the flame resistance function into a dedicated outer layer, allowing this layer to be optimized for flame resistance without needing to maintain high transparency. The inner layer handles the transparency requirement, so the outer layer can use thicker flame-resistant material that would otherwise compromise optical properties.
Solution Approach 2:
The composite structure allows the outer flammable polymeric material to be formulated and thickness-selected primarily for flame resistance performance, while the inner transparent material compensates for any opacity, achieving overall system transparency despite the outer layer's lower optical performance.
3Area of stationary object
If the size of transparent windows is increased for aesthetic purposes, then aesthetic quality is improved, but flammability resistance deteriorates
Solution Approach 1:
By segmenting the window material into functional layers, the patent enables larger window areas to be used while maintaining flame resistance. The outer flame-resistant layer continues to provide safety regardless of the increased overall window size, removing the previous constraint that limited window dimensions.
Solution Approach 2:
The composite layered material allows larger window panels to be constructed with the same flame-resistant outer layer formulation, as the flame resistance property is provided by the material composition and structure rather than being dependent on small component size.
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 layered material achieves compliance with FAA flammability resistance requirements, passes the Ohio State University heat release test, and maintains transparency and mechanical properties, enabling larger window sizes with enhanced safety and aesthetic features in aircraft interiors.
Implementation Method 1
a thin, flammable and heat resistant outer polymeric material coupled to the exterior of a thicker, transparent polymeric inner material
Implementation Method 2
The layered material is also durable and scratch resistant and has the desired mechanical properties in terms of strength and flex modulus
Data Source
AI summary
A layered material for use in transparent, flame resistant components couples a thin, fire resistant outer polymeric film to a thicker, transparent inner polymeric material. The resultant transparent layered material meets FAA flammability requirements for OSU heat release, has excellent solvent resistance and cleanability, is scratch resistant, and is transparent enough for use in interior applications in the aerospace industry. The layered material is formed via a co-extrusion or co-lamination process.