Layered Heat-Proof Clothing With Breathable Thermal Shielding
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Solution Overview
Problem
Existing heat-proof protective clothing lacks adequate lightweightness and high heat-insulating properties, failing to meet specifications for flame and radiant heat exposure tests, and often results in insufficient heat resistance and chemical resistance.
Innovation Solution
A layered heat-proof protective clothing structure comprising a front fabric layer, a breathable waterproof interlayer, and/or a heat-shielding layer, utilizing para-aramid or meta-aramid fibers with specific fiber blends and treatments, such as double weave fabrics with differential shrinkage and varying bundle spacing, to achieve enhanced heat-insulating and chemical-resistant properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional heat-proof fibers (asbestos, glass fiber, aramid) are used, then heat resistance is achieved, but lightweightness and flexibility are compromised
Solution Approach 1:
The patent uses composite fiber structures combining different types of aramid fibers (para-aramid and meta-aramid) with specific ratios to achieve both heat resistance and lightweight properties. The front fabric layer uses para-aramid fibers for heat resistance while the heat-shielding layer uses meta-aramid fibers, creating a composite material system that balances protection and weight.
Solution Approach 2:
Different regions of the protective clothing are assigned different fiber compositions and structures optimized for their specific functions. The front fabric layer uses para-aramid fibers for direct flame contact, while the heat-shielding layer uses meta-aramid fibers for thermal reflection, and the breathable waterproof layer uses a different construction for moisture management. This local differentiation achieves overall heat resistance without uniformly increasing weight.
2Temperature
If metallic coatings (aluminum) are applied to surface-treat fabrics, then radiant heat resistance is improved, but weight and complexity increase
Solution Approach 1:
Instead of using metallic coatings, the patent changes the approach by utilizing the inherent reflective properties of meta-aramid fibers in the heat-shielding layer. These fibers naturally reflect radiant heat without requiring additional coating materials, thereby achieving the same protective effect while maintaining lightweight properties and avoiding the complexity of coating applications.
3Temperature
If thicker fabric layers are used, then heat-insulating property is improved, but breathable waterproofness and flexibility are reduced
Solution Approach 1:
The protective clothing is divided into multiple functional layers: a front fabric layer for flame contact, a breathable waterproof layer for moisture management, and a heat-shielding layer for thermal reflection. Each layer has optimized thickness and structure for its specific function, allowing the overall system to achieve heat insulation without compromising breathability or waterproofness that would occur in a single thick layer.
Solution Approach 2:
Each layer is constructed with local optimizations: the front fabric layer uses tight weaving for flame resistance, the breathable waterproof layer uses microporous structure for moisture vapor transmission while blocking liquid water, and the heat-shielding layer uses loose construction for thermal reflection. This local quality differentiation enables the system to achieve heat insulation while maintaining breathability and flexibility.
4Device complexity
If conventional two-layer structures are used, then basic protection is achieved, but sufficient heat resistance and chemical resistance are not met
Solution Approach 1:
The patent employs a three-layer segmented structure where each layer provides specific protective functions: the front fabric layer resists direct flame contact, the breathable waterproof layer provides chemical resistance and moisture management, and the heat-shielding layer reflects radiant heat. This segmentation allows each layer to be optimized for its specific function, achieving superior overall protection compared to conventional two-layer structures.
Solution Approach 2:
The patent uses composite material combinations across the three layers, specifically combining para-aramid fibers in the front layer with meta-aramid fibers in the heat-shielding layer, and incorporating breathable waterproof membrane technology in the intermediate layer. This composite material system provides synergistic effects that enhance both heat resistance and chemical resistance beyond what single-material structures can achieve.
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 solution provides excellent heat-proof chemical resistance, breathable waterproofness, and high heat-insulating properties, meeting stringent test specifications for flame and radiant heat exposure, while maintaining lightweightness and reducing heat stress.
Implementation Method 1
In order to prevent radiant heat into fabrics as well, many products are surface-treated by coating, vapor deposition, sputtering or plating of metallic aluminum or the like
Implementation Method 2
Heat-insulating properties against radiant heat have been improved considerably by such methods
Implementation Method 3
a breathable waterproof interlayer and/or heat-shielding layer
Data Source
AI summary
Layered heat-proof protective clothing includes a front fabric layer and a breathable waterproof interlayer and/or heat-shielding layer, the layered heat-proof protective clothing having a thickness of 2.5 mm or greater after 5 washings according to ISO 6330, and a time to temperature increase by 24° C. of 18 seconds or longer in the heat transfer test ISO 6942-2002 in European Approach A, Section 4, according to ISO 11613, wherein the basis weight of the layered heat-proof protective clothing is 450±50 g/m2, and wherein the front fabric layer is composed of a double weave fabric, having a front side fabric and back side fabric whose TMA shrinkage factor difference at 400° C., with 150° C/min increase, is at least 4%, and the variation in thickness of the double weave fabric after 8 seconds of flame exposure from the front side fabric side following ISO 17492, TPP, being 2 mm or greater.