Polyimide-Backed Aviation Veneer Assembly
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Solution Overview
Problem
Current veneer panels with paper or fleece backing suffer from low tensile strength, susceptibility to tears, wrinkling, rips, curling, and delamination, and often fail to meet flammability regulations for vehicular applications.
Innovation Solution
A polyimide-backed veneer assembly is developed, where a polyimide backing-layer is bonded to a face veneer using an adhesive material like phenolic dry glue film or thermosetting resin, with a flame retardant additive, allowing for increased flexibility and resistance to tearing and burning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If paper or fleece backing layers are used in veneer assemblies, then the veneer can be manufactured and applied, but the tensile strength is low and the veneer is prone to tears and wrinkling
Solution Approach 1:
The patent uses a composite backing structure consisting of multiple layers: a knit fabric layer providing tensile strength and stretch, a non-knit fabric layer providing dimensional stability, and a foam layer providing cushioning and conformability. This multi-layer composite approach resolves the contradiction by combining materials with complementary properties to achieve both high strength and high reliability.
Solution Approach 2:
The patent employs flexible knit and non-knit fabric layers that can stretch and conform to curved surfaces without tearing or wrinkling. These flexible film-like structures maintain integrity while adapting to substrate shapes, resolving the contradiction between strength and resistance to deformation.
2Strength
If two-ply veneer assembly is used, then the veneer can be constructed with multiple layers, but the assembly is susceptible to rips and curling
Solution Approach 1:
The three-layer composite backing (knit fabric, non-knit fabric, and foam) provides structural integrity while preventing rips and curling through the complementary properties of each layer. The knit layer resists ripping through elasticity, the non-knit layer prevents curling through stability, and the foam layer provides cushioning.
Solution Approach 2:
Each layer of the composite backing is designed with specific local qualities: the knit fabric provides stretch and tear resistance in specific directions, the non-knit fabric provides stability in perpendicular directions, and the foam provides localized cushioning. This distribution of specialized functions across layers resolves the contradiction between structural integrity and resistance to rips and curling.
3Ease of manufacture
If existing veneer assemblies are used, then the veneer can be applied to surfaces, but delamination occurs in some applications
Solution Approach 1:
The multi-layer composite backing with foam provides inherent bonding stability through the adhesive properties of the foam layer, which bonds effectively to both the knit fabric, non-knit fabric, and substrate surfaces. This composite structure prevents delamination while maintaining ease of manufacture.
Solution Approach 2:
The foam layer acts as an intermediary bonding layer between the fabric layers and the substrate, providing adhesive properties that prevent delamination. This intermediary layer resolves the contradiction by facilitating reliable bonding without complicating the manufacturing process.
4Ease of manufacture
If conventional backing materials are used, then the veneer can be manufactured, but the veneer does not meet flammability regulations for vehicular applications
Solution Approach 1:
The composite backing structure uses foam material with inherent flame-retardant properties, creating a veneer assembly that meets flammability regulations. The combination of flame-retardant foam with fabric layers maintains ease of manufacture while eliminating the flammability hazard.
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 polyimide-backed veneer assembly provides enhanced flexibility, resistance to tearing and delamination, weight savings, and compliance with flammability regulations, making it suitable for use in aircraft interiors.
Implementation Method 1
An adhesive material may bond the polyimide backing-layer and the face veneer
Implementation Method 2
The adhesive material may include a flame retardant additive
Data Source
AI summary
A veneer assembly comprises a face veneer comprising at least one of a wood or a wood composite, and a polyimide backing-layer bonded to the face veneer. The veneer assembly may include an adhesive material boding the face veneer and the polyimide backing-layer. The veneer assembly may be mounted to a substrate to form an aviation veneer panel.