Shape Memory Fiber Fire Protective Garment
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Solution Overview
Problem
Existing firefighter protective garments face limitations in thermal insulation and comfort due to high activation temperatures of intumescent materials and vulnerability to tears or punctures in gas-filled cavity designs.
Innovation Solution
Incorporation of shape memory fibers (SMFs) within the fabric, which transform from a first crystal structure to a second at a specific temperature, creating air pockets for enhanced thermal insulation and burn mitigation, and strategically placing these fibers between thermal insulator layers to manage heat transfer effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If intumescent materials are used for thermal insulation, then thermal protection is improved, but activation temperature is too high
Solution Approach 1:
The patent changes the activation temperature parameter by replacing intumescent materials with phase change materials (paraffin wax) that activate at lower temperatures (around 47-50°C) to form insulating air pockets, thereby resolving the contradiction between high activation temperature and reliable thermal insulation
Solution Approach 2:
The patent utilizes phase transition of paraffin wax from solid to liquid and back, which creates volume expansion and forms air pockets that provide thermal insulation at lower activation temperatures, addressing both the temperature and reliability requirements
2Reliability
If gas-filled cavities are used for insulation, then thermal insulation is improved, but vulnerability to tears or punctures increases
Solution Approach 1:
The patent introduces a flexible membrane as an intermediary containment structure that holds the liquid paraffin phase change material. This membrane provides mechanical strength and tear resistance while allowing the material inside to expand and contract during phase transitions, thus protecting against punctures while maintaining insulation
Solution Approach 2:
The patent uses liquid paraffin phase change material instead of gas-filled cavities. The liquid material provides more uniform distribution and better conformability to the fabric structure, creating effective thermal insulation without the vulnerability of gas cavity membranes to tears and punctures
3Temperature
If thick insulating layers are used, then thermal protection is improved, but breathability and comfort decrease
Solution Approach 1:
The patent utilizes the phase transition of paraffin wax at specific temperatures to create dynamic insulation. When the wearer's body heat causes the paraffin to melt, it expands and forms air pockets that provide thermal insulation. When cooled, it returns to liquid state, allowing moisture vapor to pass through. This phase transition mechanism provides adaptive thermal protection while maintaining breathability
Solution Approach 2:
The patent creates a dynamic insulation system where the paraffin phase change material continuously adjusts its state based on temperature conditions. The material transitions between solid and liquid phases, dynamically adjusting insulation levels to match the wearer's thermal needs while allowing moisture vapor transmission, thus resolving the contradiction between thermal protection and breathability
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 SMF-based garments provide improved thermal insulation and comfort by maintaining skin temperature below 38°C during exposure to high heat, while maintaining functionality and safety by creating air pockets that reduce thermal conductivity and prevent burns.
Implementation Method 1
transformable fibers are situated within the associated one or more cavities, wherein the one or more transformable fibers contain a first crystal structure at a first temperature and transform to a second crystal structure at a second temperature
Implementation Method 2
shape memory fibers (SMFs) within the fabric, which transform from a first crystal structure to a second at a specific temperature
Implementation Method 3
The new shaped configuration of the transformable fiber is heated to above its transformation temperature to a second crystal structure. The heating transforms the new shaped configuration to its pre-determined configuration, wherein the pre-determined configuration forms an air pocket within the fire protective item
Implementation Method 4
creating air pockets for enhanced thermal insulation and burn mitigation, and strategically placing these fibers between thermal insulator layers to manage heat transfer effectively
Data Source
AI summary
A method and devices are described, in which a transformable fiber at a first crystal structure is shaped from its pre-determined configuration into a new shaped configuration. The new shaped configuration of the transformable fiber is inserted into a cavity of a heat and fire protective item. The new shaped configuration of the transformable fiber is heated to above its transformation temperature to a second crystal structure. The heating transforms the new shaped configuration to its pre-determined configuration, wherein the pre-determined configuration forms an air pocket within the heat and fire protective item. The transformable fiber is cooled below its transformation temperature to revert the transformable fiber back to the new shaped configuration at the first crystal structure.