Single-Layer Mesh Airbag Inflator Container for Safe Disposal
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Solution Overview
Problem
The transportation and disposal of recalled airbag inflators with ammonium nitrate propellant pose safety and logistical challenges due to their instability and potential for fragmentation upon exposure to heat, leading to accidents and environmental hazards, and existing container designs are not suitable for mass production or safe handling.
Innovation Solution
A single-layer metal container design with perforated or expanded metal steel sheet materials, incorporating a mesh layer and environmental barrier, is proposed to safely transport and dispose of airbag inflators, with a method for sorting and optimizing container loads based on inflator type and size, and a system for deploying and disposing of inflators by applying heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional multi-layer container designs are used, then safety margins are increased, but manufacturing complexity and cost increase
Solution Approach 1:
The patent applies composite materials by combining expanded metal steel sheet (providing structural strength and fragmentation resistance) with perforated metal sheets (allowing heat dissipation and gas venting) and environmental barriers (preventing contamination). This composite structure achieves enhanced safety through material properties rather than multiple layers, resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The container design applies local quality by using different material properties in different regions: expanded metal provides strength where structural integrity is needed, while perforated sections provide heat dissipation where thermal management is critical, and environmental barriers are applied where contamination protection is required. This localized optimization achieves comprehensive safety without requiring uniform multi-layer construction throughout the entire container.
2Ease of operation
If recalled airbag inflators are transported using existing methods, then transportation is simple, but safety risks increase due to fragmentation and environmental hazards
Solution Approach 1:
The patent converts the harmful fragmentation tendency of recalled inflators into a beneficial contained event. The expanded metal container structure is designed to withstand and contain the fragmentation forces, transforming the hazard into a controlled scenario where fragments are retained within the container rather than dispersed into the environment. This approach maintains transportation simplicity while dramatically improving safety.
Solution Approach 2:
The container acts as an intermediary between the hazardous inflators and the external environment. It mediates the interaction by providing a protective barrier that prevents direct contact between fragments and the outside world, while still allowing necessary functions like heat dissipation and controlled venting. This intermediary structure enables safe transportation without complicating the operation.
3Ease of manufacture
If single-layer container design is used, then manufacturing cost and complexity are reduced, but safety against fragmentation and environmental damage may be compromised
Solution Approach 1:
The single-layer design achieves protective equivalence to multi-layer structures through composite materials. The expanded metal steel sheet provides structural strength and fragmentation containment, while integrated perforated sections provide heat dissipation and environmental barriers provide contamination protection. This material-based solution achieves comprehensive protection in a single-layer configuration, reducing manufacturing complexity while maintaining safety.
Solution Approach 2:
The patent changes the parameters of the container material itself to achieve enhanced protection. By using expanded metal with specific geometric patterns and thickness parameters, the single-layer structure achieves the mechanical properties that would otherwise require multiple layers. The material parameters are optimized to provide both structural integrity and environmental protection functions simultaneously.
4Loss of substance
If recalled inflators are exposed to heat during disposal, then complete destruction is achieved, but fragmentation risk increases
Solution Approach 1:
The container provides beforehand cushioning by being pre-designed to withstand the forces generated during thermal disposal. The expanded metal structure acts as a cushioning barrier that absorbs and contains fragmentation forces that occur when inflators are exposed to heat during the disposal process. This prior preparation prevents fragmentation from becoming a harmful factor, enabling complete destruction safely.
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 optimized container design enhances safety by preventing fragmentation and environmental damage, allowing for efficient and cost-effective bulk transport and disposal of recalled airbag inflators, while adhering to regulatory standards, thereby reducing the risk of accidents and economic losses.
Implementation Method 1
The optimized container design enhances safety by preventing fragmentation and environmental damage
Implementation Method 2
A method for sorting and optimizing container loads based on inflator type and size, and a system for deploying and disposing of inflators by applying heat
Data Source
AI summary
Embodiments described herein include layered mesh containers and methods for using the containers to safely transport and dispose of airbag inflators having ammonium-nitrate-based propellant. For example, a container with at least two single-layer sidewalls is provided that can hold multiple airbag inflators and withstand up to 4 moles of matter being deployed from an inflator having ammonium-nitrate-based propellant. The container can contain the inflator and any shrapnel associated with the explosion while also venting gases expelled as a result of the explosion. Various container designs are provided, along with methods for using these containers.