Multi-layer heat barrier fabric with air gaps
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Firefighter protective clothing faces challenges with extreme heat, heat stress, and skin burns due to conduction, convection, and thermal radiation from fires, flames, and explosions, with existing heat barriers being inadequate in preventing heat transfer and moisture ingress.
Innovation Solution
A multi-layer fabric system comprising an exterior fabric, membrane, intermediate fabric, and interior fabric, with woven or nonwoven active carbon, and silicone extrusions to create air gaps for ventilation, providing insulation, moisture permeability, and liquid resistance while preventing heat transfer and flame contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-layer heat barrier fabric is used, then the structure is simple and cost is low, but the heat transfer protection is insufficient and moisture permeability is poor
Solution Approach 1:
The heat barrier fabric is divided into multiple functional layers: an outer layer for heat resistance, an intermediate layer with air gaps for thermal insulation, and an inner layer for moisture management. This segmentation allows each layer to perform its specific function optimally, providing comprehensive protection against heat transfer while maintaining moisture permeability.
Solution Approach 2:
The fabric combines different materials with complementary properties: heat-resistant fibers for thermal protection, porous materials for air circulation and insulation, and moisture-wicking materials for sweat management. This composite structure achieves superior heat transfer protection that cannot be obtained with a single material.
2Volume of moving object
If layers are placed close together to reduce bulk, then the clothing is more compact, but heat conduction increases and causes skin burns
Solution Approach 1:
Air gaps are introduced as intermediary spaces between the fabric layers. These air gaps act as thermal insulators, preventing direct heat conduction from the outer layer to the inner layer and ultimately to the skin. The air trapped in these gaps serves as a protective mediator that reduces heat transfer while maintaining a compact overall structure.
3Reliability
If the fabric is made watertight to prevent fluid ingress, then liquid protection is improved, but steam and moisture permeability is reduced
Solution Approach 1:
The fabric structure exhibits different properties at different locations and scales: at the macro level, the tight weave and coating provide watertight protection against liquid penetration; at the micro level, the porous structure and hydrophilic channels allow water vapor and sweat molecules to pass through. This local differentiation of quality enables simultaneous liquid resistance and vapor permeability.
4Temperature
If traditional arimide nonwoven fabric is used for heat barrier, then heat resistance is provided, but the fabric is expensive and has manufacturing problems
Solution Approach 1:
The invention replaces expensive arimide nonwoven fabric with more cost-effective materials such as cotton, polyester, or rayon that can be easily manufactured using conventional textile processes. While these materials may have shorter individual lifespans under extreme heat, the multi-layer structure provides sufficient protection for the intended use duration while dramatically reducing material and manufacturing costs.
Solution Approach 2:
The invention changes the material parameters from high-performance but expensive arimide fibers to more common, cost-effective fibers. By optimizing the multi-layer structure, fabric density, and finishing treatments, the design achieves adequate heat resistance parameters without requiring the most expensive materials, thus improving ease of manufacture and reducing cost.
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 multi-layer fabric system effectively delays heat transfer, reduces heat stress, and allows for air circulation, providing comfort and mobility while maintaining durability and cost-effectiveness, even at elevated temperatures up to 300 degrees.
Implementation Method 1
the intermediate layer greatly reduces the heat the inner layer is exposed and reduces heat while expelling body moisture through the gap it provides, which ensures the air circulation
Implementation Method 2
it allows steam and air diffuse through it, features high strength, durable
Implementation Method 3
reduces heat while expelling body moisture through the gap it provides, which ensures the air circulation
Implementation Method 4
Thermal Radiation is a type of heat transfer, where the heat is conveyed from hot objects in the form of the light energy
Data Source
Figure 1~3
AI summary
This invention is about the protective fabric that provides full protection against heat stress when exposed to elevated temperatures, comprising of an exterior fabric (1), membrane (3), barrier fabric (6), intermediate fabric (7) and interior fabric (4) thanks to its ability to prevent heat transfer, respirability, water tightness and inflammability.