Conductive Nonwoven Shielding Tape for Stable Spiral Wire Shielding

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conductive nonwoven fabric tapes used for shielding wires face issues with reduced shielding effect due to lapped portions separating during bending and low versatility, especially when adhesive layers are not optimally distributed, leading to spiral conductive paths and instability.

Innovation Solution

A shielding wire design featuring a conductive nonwoven fabric tape with a partially formed adhesive layer that adheres to both the electric wire and overlapping tape when wound in a spiral shape, optimizing the ratio of adhesive and conductive areas to maintain effective shielding while allowing for versatile application.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the conductive nonwoven fabric tape is wound in a spiral shape with adhesive layer at each lapped portion, then the tape adheres well to the electric wire, but the conductive path becomes spiral and the shielding effect significantly decreases

Engineering Contradiction:

Improveadhesion strengthVSAvoidshielding effect

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The adhesive layer is selectively positioned only in the lapped portion area rather than uniformly across the entire tape width. This local placement ensures adhesion at the overlap region while leaving the main body of the tape conductive and planar, maintaining both adhesion strength and shielding effectiveness

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The adhesive layer is divided into multiple independent regions corresponding to different lapped portions along the tape length. Each adhesive segment is independently positioned to adhere at specific overlap points, allowing the tape to maintain proper adhesion while preserving continuous conductive paths in the non-adhesive areas

Inventive Principle:

Principle #1Segmentation

2Strength

If the adhesive layer width matches the tape width for vertical attachment, then the tape adheres well when attached vertically, but the product requires customization for each winding state and electric wire diameter, resulting in low versatility

Engineering Contradiction:

Improveadhesion strengthVSAvoidproduct versatility

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

Instead of providing adhesive across the entire tape width, the adhesive layer is applied only to the extent needed for lapped portion adhesion. This partial application reduces material usage and allows the same tape design to work across different widths and winding configurations, improving versatility while maintaining sufficient adhesion

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The tape design with localized adhesive in lapped portions can be universally applied to different electric wire diameters and winding configurations (spiral, vertical, horizontal). The adhesive automatically positions itself at the overlap region regardless of the specific application geometry, making the product adaptable to multiple scenarios without customization

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of manufacture

If the adhesive layer is formed only on one end of the conductive nonwoven fabric in width direction, then the manufacturing is simplified, but the conductive nonwoven fabric may float away from the electric wire when used vertically, reducing the shielding effect

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidshielding effect

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The adhesive layer is pre-positioned in the lapped portion area before the tape is wound or attached to the electric wire. This preliminary positioning ensures that when the tape is applied, the adhesive is already in the correct location to secure the overlap region, preventing floating and maintaining shielding effectiveness without complex manufacturing steps

Inventive Principle:

Principle #10Preliminary action

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 optimized adhesive and conductive area ratios ensure a consistent shielding effect across various configurations, including bending and vertical attachment, enhancing the tape's versatility and maintaining effective electromagnetic shielding.

Implementation Method 1

the adhesive layer adheres to the electric wire and also adheres to the conductive nonwoven fabric tape that overlaps when wound in a spiral shape

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS20250095878A1Shielding wire

Publication Date: 2025.03.20 YAZAKI CORP

AI summary

A shielding wire includes: an electric wire; and a conductive nonwoven fabric tape. The conductive nonwoven fabric tape includes a conductive nonwoven fabric and an adhesive layer. The adhesive layer adheres to the electric wire and adheres to the conductive nonwoven fabric tape that overlaps when wound in a spiral shape. Relationships of: S/tL≤0.5; and (S1−S2)/tL≥0.25 are satisfied, in which tis a width of the conductive nonwoven fabric tape wound in a spiral shape, L is a length of the conductive nonwoven fabric tape, S is an area of the adhesive layer in the conductive nonwoven fabric tape, S1 is an area of a lapped portion where the conductive nonwoven fabric tape overlaps when the conductive nonwoven fabric tape is wound in a spiral shape, and S2 is an area of the adhesive layer in the lapped portion.