Double-Faced Flame Resistant Fabric for High Visibility
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Solution Overview
Problem
Current high visibility personal protection garments that are also heat and flame resistant often require multiple layers, chemical treatments, or toxic materials, which compromise visibility, durability, or safety reliability.
Innovation Solution
A single-layer double-faced fabric combining inherently flame retardant dyeable yarns and aramid yarns, where the dyeable yarn forms the visible face and aramid yarn the reverse, allowing for high visibility coloration and integral heat and flame resistance without the need for smothering gases or chemical treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aramid yarns are used to manufacture heat and flame resistant garments, then heat and flame resistance is improved, but the ability to be dyed to high visibility colours is lost
Solution Approach 1:
The fabric is divided into two distinct faces: the outer face uses dyeable yarns (polyester, viscose, or modacrylic) that can be dyed to high visibility colours, while the inner face uses aramid yarns that provide heat and flame resistance. This segmentation allows each material to perform its specialized function without compromising the other.
Solution Approach 2:
Different regions of the fabric have different properties: the outer face is optimized for visibility with dyeable materials, while the inner face is optimized for protection with aramid materials. This local differentiation resolves the contradiction by allowing each zone to have the quality it needs.
2Illumination intensity
If a high visibility garment is layered on top of a heat and flame resistant garment, then high visibility is improved, but weight increases and heat and flame resistant outer layer protection is lost
Solution Approach 1:
The invention merges the high visibility function and the heat/flame resistance function into a single integrated fabric structure. The double-faced weave combines dyeable yarns on the outer face with aramid yarns on the inner face, eliminating the need for separate layered garments and reducing overall weight.
Solution Approach 2:
The single fabric performs multiple functions simultaneously: the outer face provides high visibility through dyeable materials while the inner face provides heat and flame resistance through aramid materials. This multi-functionality eliminates the need for multiple separate garments.
3Reliability
If viscose and acrylic fabric is chemically treated to provide flame resistance, then flame resistance is improved, but the treatment is removed over time during cleaning, decreasing protection level
Solution Approach 1:
The aramid yarns on the inner face inherently provide flame resistance without requiring chemical treatments. This self-service approach means the protective function is built into the material structure itself and does not degrade over time or during cleaning, unlike chemically treated fabrics.
Solution Approach 2:
The invention avoids using chemically treated materials that have limited durability. Instead, it uses inherently flame-resistant aramid materials that provide long-lasting protection throughout the garment's service life, eliminating the need for re-treatment or replacement due to treatment degradation.
4Reliability
If modacrylic smothering yarn is used to moderate combustion, then flame spread is reduced, but toxic gases such as HCI are released and the fabric has harsher handle with inferior drape
Solution Approach 1:
The invention extracts and removes the harmful smothering yarn component from the fabric structure. Instead of using modacrylic smothering yarn that releases toxic gases, the design relies on the inherent flame resistance of aramid yarns on the inner face, eliminating the source of toxic emissions while maintaining flame spread control.
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 a lightweight, durable, and reliable high visibility fabric that maintains heat and flame resistance while ensuring the wearer's visibility and safety, with no need for additional treatments or toxic materials, passing stringent standards for heat, flame, and visibility requirements.
Implementation Method 1
the flame retardant dyeable yarn is suitably of the 'melt and surface shield' type, which provides flame retardancy by a completely different mechanism to a smothering gas yarn
Implementation Method 2
Aramid yarns are often used to manufacture heat and flame resistant personal protection garments, due to the high level of protection they provide
Data Source
Figure 1
AI summary
The present application is concerned with a fabric for use in high visibility personal protection clothing. The present application proposes that a yarn (16, 18) capable of being dyed to a high visibility colour and a non- fusible yarn (14) are combined in a single fabric so as to provide a fabric which not only has heat and flame resistance but can also be dyed to high visibility colours. In particular, a fabric comprising a flame retardant dyeable yarn (16, 18) and a non- fusible fibre yarn (14), wherein the yarns form a double faced fabric is disclosed. In embodiments, the fabric is a double faced weave wherein the flame retardant yarn is a flame retardant polyester and the non -fusible yarn is an aramid yarn.