Flame-Resistant Viscose-Polyamide Fabric Blend for Dyeable PPE
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Solution Overview
Problem
Current flame-resistant fabrics for personal protective equipment (PPE) often compromise on wearing comfort, dyeability, and environmental sustainability, as they typically use aramides or PBI fibers that are difficult to dye and have limited mechanical properties, while alternatives like Modacryl offer poor thermal stability and high material costs.
Innovation Solution
A woven fabric structure composed of a blend of at least 50% flame-resistant viscose fibers and 10% meltable fibers, such as polyamide, with a total fractional cover factor greater than 60%, which provides enhanced flame protection and dyeability without the need for additional flame retardant additives, maintaining stability and preventing melting or dripping during exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aramide or PBI fibers are used for flame-resistant PPE fabrics, then flame resistance is improved, but dyeability deteriorates and material cost increases
Solution Approach 1:
The patent uses a composite fiber blend consisting of flame-resistant viscose fibers (50-95% by weight) and meltable fibers (5-50% by weight, specifically polyamide 6 or 6.6). This composite structure combines the flame resistance of viscose with the dyeability and mechanical properties of polyamide, achieving full flame retardant protection (Index III according to ISO 15015) while maintaining ease of dyeing with common methods and reducing material cost.
2Reliability
If aramide or PBI fibers are used for flame-resistant PPE fabrics, then flame resistance is improved, but material cost increases
Solution Approach 1:
The patent replaces expensive aramide and PBI fibers with a more cost-effective combination of flame-resistant viscose fibers and common polyamide fibers. This substitution maintains full flame retardant protection (Index III) while significantly reducing material cost, making the fabric more economically viable for PPE applications.
3Ease of manufacture
If Modacryl fiber is used in fiber blends, then dyeability is improved, but thermal stability deteriorates
Solution Approach 1:
The patent changes the fiber composition parameters by using flame-resistant viscose fibers (which have good thermal stability) combined with polyamide fibers (which have good dyeability and mechanical properties). This parameter change achieves a balance where the fabric can be easily dyed with common methods while maintaining thermal stability and flame resistance (Index III), unlike Modacryl blends which sacrifice thermal stability for dyeability.
4Adaptability or versatility
If flame-resistant viscose fibers are used, then environmental sustainability is improved, but mechanical properties deteriorate
Solution Approach 1:
The patent creates a composite fiber blend combining flame-resistant viscose fibers (environmentally preferable) with polyamide 6 or 6.6 fibers (known for excellent mechanical properties). This composite structure compensates for the weaker mechanical properties of viscose by incorporating polyamide, achieving both environmental sustainability and adequate mechanical strength for PPE applications while maintaining full flame retardant protection.
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 withstands horizontal flame exposure for 10 seconds without hole formation, offering improved non-melt performance, dyeability, and color quality, while maintaining thermal stability and dimensional integrity, thus providing a thermally stable and environmentally preferable flame protective solution for PPE.
Implementation Method 1
the second fiber component comprising meltable fibers... providing enhanced flame protection and dyeability without the need for additional flame retardant additives, maintaining stability and preventing melting or dripping during exposure
Implementation Method 2
the first fiber component comprising flame resistant viscose fibers... the fabric effectively withstands horizontal flame exposure for 10 seconds without hole formation
Data Source
AI summary
A flame protective fabric structure (1) comprises a fabric (10) being formed with multiple yarns (20), each yarn (20) made of a fiber blend of at least a first fiber component and a second fiber component. The first fiber component comprises flame resistant viscose fibers (22) in an amount of at least 50% of the fiber blend weight and the second fiber component comprises meltable fibers (24) in an amount of at least 10% of the fiber blend weight. The fabric (10) is formed as a woven fabric with a total fractional cover factor of greater than 60% having a capability to withstand a horizontal flame exposure of 10 seconds without hole formation according to ISO 15025/14116_Index III.