Nonwoven Flexible Composites for Lightweight Inflatable Life-Saving Devices
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Solution Overview
Problem
Woven substrates used in inflatable life-saving devices like evacuation slides and life rafts suffer from crimp effects, leading to compromised mechanical performance and increased weight due to unnecessary coatings, which are not optimal for balancing strength and weight requirements.
Innovation Solution
The use of nonwoven materials with a substrate of filaments bonded by adhesives or primers and coated with gas barrier polymers, such as polyurethane, to create high-strength, lightweight flexible composites that minimize crimp effects and reduce material thickness, thereby enhancing tensile strength and reducing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If woven substrates are used for inflatable structures, then strength and rigidity are provided, but crimp effects occur leading to compromised mechanical performance and increased weight
Solution Approach 1:
The patent changes the fundamental structural parameter from woven architecture to nonwoven architecture. This eliminates the crimp effect inherent in woven fabrics where yarns interlace over and under each other. The nonwoven substrate uses randomly oriented fibers bonded together, providing straight load paths that maximize tensile strength while reducing weight by eliminating unnecessary coating layers.
Solution Approach 2:
The patent employs composite material construction by combining nonwoven substrate with adhesive or primer coatings and gas barrier polymer layers. This multi-layer composite approach achieves superior mechanical performance and air-holding characteristics while maintaining lightweight properties, as each layer contributes specific functions without the weight penalty of traditional woven substrate coatings.
2Reliability
If woven substrates are coated and laminated to provide air holding characteristics, then air holding performance is improved, but weight increases due to additional coating layers
Solution Approach 1:
The patent changes the surface morphology parameter by using nonwoven fabric with controlled porosity and fiber distribution. This allows the substrate itself to provide air holding characteristics through its inherent structure, reducing or eliminating the need for multiple heavy coating layers while maintaining reliable air barrier performance.
3Weight of moving object
If nonwoven materials are used instead of woven substrates, then weight is reduced and tensile strength is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies adhesive or primer coatings to the nonwoven substrate before applying the gas barrier polymer layers. This preliminary bonding action ensures proper adhesion and eliminates the need for complex post-manufacturing treatments or repairs, simplifying the overall manufacturing process while achieving the desired lightweight and high-strength properties.
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
Nonwoven materials provide improved tensile strength, reduced weight, and enhanced air-holding characteristics, achieving a strength-to-weight ratio superior to traditional woven substrates, while maintaining structural integrity under high inflation pressures and extreme temperatures.
Implementation Method 1
a substrate of nonwoven material comprising a plurality of filaments; an adhesive or primer to bind the filaments
Implementation Method 2
a coating or film or both on one or both surfaces of the substrate of nonwoven material; wherein the flexible composite material is a high-strength lightweight material
Data Source
AI summary
Embodiments of the present invention provide systems and methods for using nonwoven materials for evacuation slides, life rafts, life vests, and other life-saving inflatable devices. The nonwoven materials have a substrate layer with continuous filaments formed in various directions.