Flash Fire Chemical Barrier Fabric with Heat Sealable Outer Layer
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Solution Overview
Problem
Chemical protective fabrics lack both chemical and flash fire resistance, with existing solutions either being expensive, difficult to manufacture, or providing limited radiant heat resistance due to issues with flame retardant additives affecting the clarity of thermoplastic films and seams being prone to contamination.
Innovation Solution
A multilayer composite fabric with a flame retardant base layer, a thermal expanding adhesive layer, a metalized chemical barrier layer, and a clear heat sealable thermoplastic outer layer, which provides both chemical and flash fire protection by blocking radiant heat and maintaining seam integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If flame retardant additives are introduced into thermoplastic film to achieve flame resistance, then flammability resistance is improved, but the film becomes milky or cloudy which significantly reduces the ability of the reflective surface beneath it to reflect radiant heat load
Solution Approach 1:
The invention divides the protective layer into two separate components: a flame retardant fabric layer and a clear heat sealable thermoplastic film layer. The flame retardant properties are confined to the fabric layer through additives, while the thermoplastic film layer remains transparent to maintain radiant heat reflection. This segmentation resolves the contradiction by isolating the flame retardant functionality from the optical clarity requirement.
Solution Approach 2:
The invention creates a composite structure combining flame retardant fabric with clear thermoplastic film. The composite material integrates the flame resistance properties of the treated fabric with the optical clarity and heat sealability of the thermoplastic film, achieving both flammability resistance and radiant heat reflection without the drawbacks of adding flame retardants to the film itself.
2Illumination intensity
If clear non flame retardant thermoplastic film is used to maintain clarity and radiant heat reflection, then radiant heat reflection ability is improved, but the film will burn off of the surface when subjected to vertical flame
Solution Approach 1:
The protective system is segmented into two functional layers: the clear thermoplastic film provides radiant heat reflection, while the separate flame retardant fabric layer provides flammability resistance. This segmentation allows each layer to perform its specialized function without compromise.
Solution Approach 2:
The clear thermoplastic film acts as an intermediary protective layer that reflects radiant heat before it reaches the underlying flame retardant fabric. This intermediary layer reduces the thermal load on the fabric while maintaining overall flame resistance through the combined system.
3Object-affected harmful factors
If flame retardant fabric is used as base layer to provide flame resistance, then flammability resistance is improved, but the seams are prone to contamination and only heat sealable on the inside surface
Solution Approach 1:
Instead of making the flame retardant fabric heat sealable, the invention inverts the approach by placing a clear heat sealable thermoplastic film on the outer surface. This allows seams to be heat sealed on the outside, creating a sealed barrier that prevents contamination while the flame retardant fabric remains as the structural base layer.
Solution Approach 2:
The composite structure combines flame retardant fabric with clear heat sealable thermoplastic film, where the film layer provides both the heat sealable exterior surface and an additional barrier against contamination, while the fabric provides the flame resistant foundation.
4Object-affected harmful factors
If secondary outer cover made from reflective metalized flame retardant fabric is used to meet NFPA 1991 requirements, then flash fire resistance is improved, but the garment structure becomes more complex and manufacturing becomes more difficult
Solution Approach 1:
The invention merges the functions of the flame retardant fabric and the clear heat sealable thermoplastic film into a single integrated composite material. This unified structure eliminates the need for separate secondary outer covers, simplifying the overall garment construction while maintaining flash fire resistance and heat sealability.
Solution Approach 2:
The composite fabric serves multiple functions simultaneously: it provides flame resistance through the treated fabric, radiant heat reflection through the clear film, heat sealability through the thermoplastic layer, and contamination resistance through the sealed exterior seams. This multi-functionality eliminates the need for multiple separate protective layers.
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 fabric effectively blocks 14 out of 15 ASTM F1001 chemicals for 8 hours and maintains an interior surface temperature below 275°F during a flash fire, while being heat sealable and resistant to flammability, ensuring both chemical and radiant heat protection.
Implementation Method 1
a thermal expanding adhesive layer
Implementation Method 2
a metalized chemical barrier layer
Data Source
AI summary
A flash fire and chemical barrier composite fabric, comprising a flame resistant fibrous basic layer; a radiant heat and chemical permeation barrier, the barrier including a metalized polymeric chemical permeation resistant layer film; and a clear heat sealable outer film layer overlying the radiant barrier and forming a heat sealable outer surface of the composite fabric.