Assembled Yarn Electromagnetic Shielding Fabric Durability
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Solution Overview
Problem
Existing electromagnetic shielding fabrics for protective clothing fail to maintain excellent shielding properties and electrical conductivity after multiple laundry operations, and they often do not meet the flame retardancy and performance standards set by CEI/IEC 60895:2002, especially for workers exposed to high-voltage electricity.
Innovation Solution
The development of an assembled yarn comprising a core yarn with stainless steel fibers and a wrap yarn of metallic filaments, wrapped around each other with high turns per meter, which is integrated into a woven or knitted fabric structure, providing excellent electromagnetic shielding and electrical conductivity across a broad frequency range while maintaining performance after multiple launderings and meeting CEI/IEC 60895:2002 standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing electromagnetic shielding fabrics are used, then initial shielding properties are provided, but performance deteriorates after multiple laundry operations
Solution Approach 1:
The patent employs composite yarns combining metallic filaments (for conductivity and shielding) with synthetic fibers (for structural integrity and wash durability). This composite structure maintains shielding performance through multiple launderings by integrating the metallic conductive elements within a robust fiber matrix that resists degradation during washing.
Solution Approach 2:
The patent modifies physical parameters including yarn twist level, metallic filament concentration, and fabric weave density to optimize both initial shielding effectiveness and durability after laundering. By adjusting these parameters, the fabric maintains stable electrical conductivity and shielding properties even after repeated wash cycles.
2Reliability
If flame retardancy and performance standards are strictly met, then worker protection is ensured, but fabric flexibility and comfort are reduced
Solution Approach 1:
The patent applies flame-retardant treatments and conductive metallic elements selectively to specific regions and layers of the fabric structure. By concentrating protective properties where most needed (outer layers and conductive pathways) while maintaining flexibility in other areas, the fabric achieves CEI/IEC 60895:2002 compliance without sacrificing overall flexibility and worker comfort.
Solution Approach 2:
The patent uses synthetic fibers that inherently replicate the flame-resistant properties of natural fibers like cotton while providing superior durability and flexibility. This allows the fabric to meet flame retardancy standards through material selection rather than restrictive structural designs.
3Reliability
If high metallic fiber content is used, then electrical conductivity and shielding efficiency are improved, but fabric flexibility and comfort are reduced
Solution Approach 1:
The patent concentrates metallic filaments in specific yarns and fabric regions where electrical conductivity is most critical for shielding effectiveness, while using lower metallic content in other areas. This localized approach maintains necessary electrical properties without uniformly sacrificing fabric flexibility throughout the entire garment.
Solution Approach 2:
The patent creates composite yarns where metallic filaments are integrated with flexible synthetic fibers in optimized ratios. This composite structure provides the electrical conductivity needed for shielding while the synthetic fiber component maintains fabric flexibility and comfort for worker wearability.
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 durable, flame-retardant fabrics with high electrical conductivity and effective electromagnetic shielding across a wide range of frequencies, maintaining performance even after multiple wash cycles and adhering to the specified standards, ensuring protection for workers in high-voltage environments.
Implementation Method 1
The invention provides assembled yarns, in particular for use in an electromagnetic shielding fabric... The fabric comprises electrically conductive yarns in the warp direction and in the weft direction of the fabric
Implementation Method 2
The first wrap yarn comprises or consists out of one or a plurality of metallic filaments... providing excellent electromagnetic shielding and electrical conductivity
Data Source
AI summary
An assembled yarn comprises a first yarn and a second yarn. The first yarn comprises a core yarn and a first wrap yarn. The core yarn comprises a spun yarn, wherein the spun yarn comprises a blend of fibers, wherein the blend of fibers comprises first electrically conductive fibers. The first wrap yarn comprises or consists out of one or a plurality of metallic filaments. The first wrap yarn is wrapped around the core yarn with at least 300 turns per meter. The second yarn comprises second electrically conductive fibers. The second yarn is wrapped around the first yarn; or the second yarn is ply-twisted with the first yarn thereby forming a plied yarn. The assembled yarn can be used in electromagnetic shielding fabrics.