Conductive Non-Woven Tape Winding for Bend-Stable Wire Shielding
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Solution Overview
Problem
Existing shielded electric wires face reduced shielding effectiveness due to separation of conductive non-woven tape ends when bent, and spiral winding creates a conductive path that diminishes the magnetic field cancellation effect.
Innovation Solution
A shielded electric wire design with a conductive non-woven tape spirally wound around the electric wire, featuring an adhesive layer positioned differently from the wrapped portion, with specific adhesive force, width, and thickness to maintain contact and form a tubular conductive path for enhanced magnetic field cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the conductive non-woven tape is attached using longitudinal attachment method, then the manufacturing process is simple, but the wrapped portion opens when the shielded electric wire is bent, reducing shielding effect
Solution Approach 1:
The conductive non-woven tape is wound spirally around the electric wire instead of being attached longitudinally, creating a curved/wrapped configuration that maintains continuous contact and prevents opening during bending operations
2Strength
If the adhesive layer is made thicker to improve adhesion, then the tape attachment is stronger, but the adhesive layer may interfere with the conductive path and reduce shielding effect
Solution Approach 1:
The adhesive layer thickness is controlled within a specific range (0.01 mm to 0.05 mm) to optimize both adhesive strength and electrical properties, preventing excessive thickness that would interfere with conductive paths while ensuring sufficient attachment force
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 design maintains superior shielding performance even under bending conditions, ensuring effective magnetic field cancellation and reduced tape displacement, outperforming conventional methods.
Implementation Method 1
a conductive non-woven tape including a conductive non-woven fabric and an adhesive layer located on one surface of the conductive non-woven fabric
Implementation Method 2
a conductive non-woven fabric and an adhesive layer located on one surface of the conductive non-woven fabric
Implementation Method 3
a magnetic field generated by the signal current flowing through the electric wire and a magnetic field generated by a return current flowing through the conductive non-woven tape
Data Source
AI summary
A shielded electric wire includes an electric wire and a conductive non-woven tape wound around the electric wire. The conductive non-woven tape includes a conductive non-woven fabric and an adhesive layer located on one surface of the conductive non-woven fabric, and is wound with a winding pitch of t/3 or more and t/2 or less to form a wrapped portion, where t is a width of the conductive non-woven tape. The adhesive layer is located in a different position from the wrapped portion, has an adhesive force of 2.0 N/19 mm or more measured by an adhesive force test in accordance with JIS C 2107, has a width of t/10 or more, and has a thickness of 0.01 mm or more and not more than a thickness of the conductive non-woven fabric.