Wrappable EMI Sleeve with Flat Conductive Warp Filaments
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Solution Overview
Problem
Existing sleeves for protecting elongate members against electromagnetic interference (EMI), radio frequency interference (RFI), and electrostatic discharge (ESD) are costly, inefficient, and prone to damage due to the use of round conductive wires with low tensile strength, which can lead to wear and arcing, and often create openings when grounding is attempted.
Innovation Solution
A wrappable textile sleeve with a woven substrate of flat, thin conductive and nonconductive warp and weft filaments, where the warp filaments are stacked to enhance protection without increasing width, and a ground member is woven to prevent openings when extended for grounding, providing flexible and durable shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If round conductive wires are used to construct the protective barrier, then the sleeve can provide EMI, RFI and ESD protection, but the wires have low tensile strength and tend to be damaged and broken in use
Solution Approach 1:
The patent changes the geometric parameter of the conductive element from round wire to flat ribbon shape. This parameter change increases the tensile strength and durability of the conductive barrier while maintaining its EMI, RFI and ESD protection capabilities. The flat ribbon configuration provides greater structural integrity and resistance to damage during installation and service.
Solution Approach 2:
The patent employs composite construction by combining flat conductive ribbons with non-conductive support structures or coatings. This composite approach enhances the overall strength and durability of the sleeve while preserving the conductive properties necessary for electromagnetic protection. The combination of materials optimizes both mechanical strength and shielding effectiveness.
2Ease of operation
If ground members are pulled away from the wall of the sleeve for attachment to ground, then grounding can be achieved, but an opening is created in the wall of the sleeve through which EMI, RFI and ESD can pass
Solution Approach 1:
The patent resolves this contradiction by transitioning from a two-dimensional flat wall structure to a three-dimensional configuration where the ground member extends through the wall in the radial dimension. The ground member passes through the conductive barrier and maintains contact with the outer surface, allowing grounding access without creating openings that would compromise the shielding integrity in the lateral dimensions.
Solution Approach 2:
The patent introduces an intermediary structure where the ground member acts as a conductor that bridges the internal and external environments without creating discontinuities in the shielding wall. The ground member is integrated into the wall structure rather than being attached to it, serving as both a grounding path and a structural element that maintains shielding continuity.
3Reliability
If coated members are used to provide conductive protection, then EMI, RFI and ESD protection can be achieved, but the conductive coating can be worn off, thereby impacting the ability of the sleeving to provide protection
Solution Approach 1:
The patent changes the physical state and configuration of the conductive material from a thin surface coating to a substantial flat ribbon structure. This parameter change transforms the conductive element from a superficial layer prone to wear and removal to a robust structural component with inherent durability. The flat ribbon configuration provides greater material volume and structural integrity, significantly extending the service life of the protective sleeving.
4Ease of operation
If round wire or round conductors are used to construct the protective barrier, then the sleeve can be flexible, but the round conductive members are typically provided as fine wire having low tensile strength and tending to be damaged and broken
Solution Approach 1:
The patent changes the geometric parameters of the conductive element from round cross-section to flat ribbon cross-section. This parameter change increases the moment of inertia and structural rigidity while maintaining flexibility for wrapping and conforming to cables. The flat configuration provides greater tensile strength and resistance to breaking while retaining the ability to bend and flex as needed for installation.
Data Source
Figure 1~1B
Figure 1C~2B
Figure 2C~2D
AI summary
A wrappable textile sleeve for protecting a conductive elongate member against at least one of EMI, RFI or ESD and method of construction thereof is provided. The sleeve includes a plurality of warp filaments and at least one weft filament woven with one another to form a woven substrate. The woven substrate has opposite sides extending lengthwise between opposite ends. The opposite sides are wrappable about a central longitudinal axis into overlapping relation with one another to circumferentially enclose the elongate member within a cavity of the sleeve. At least some of the warp filaments are provided as generally flat, thin conductive filaments shield the conductive elongate member against the effects of EMI, RFI and/or ESD.