Multicore Cable Release Layer for Easier Jacket Removal

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Solution Overview

Problem

Existing multicore cables face difficulty in easily removing the jacket, which hinders efficient connection to devices and affects productivity.

Innovation Solution

A multicore cable design with a core of twisted electrical wires, a release layer covering the core, and a jacket, where the lay length of the wires is between 21 to 28 times the core's long dimension, and the release layer is fixed to the jacket, reducing friction and facilitating easy removal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the jacket is tightly fixed to the core for durability, then the cable structure is stable, but the jacket becomes difficult to remove

Engineering Contradiction:

Improvecable structure stabilityVSAvoidjacket removal ease

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The cable structure is segmented into three distinct layers: core, release layer, and jacket. The release layer acts as a functional interface between the core and jacket, allowing the jacket to be firmly attached during use but easily removed when needed, thus resolving the contradiction between structural stability and ease of removal.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A release layer is introduced as an intermediary component between the core and the jacket. This release layer has controlled adhesion properties that allow the jacket to be securely fixed during normal operation while enabling easy removal by overcoming the controlled adhesion force, thus solving the contradiction between firm fixation and easy removal.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Volume of moving object

If the lay length is short to reduce cable size, then the cable is more compact, but the jacket becomes difficult to remove and twist waves increase

Engineering Contradiction:

Improvecable sizeVSAvoidjacket removal ease

Core Design Contradiction:

Volume of moving objectVSEase of operation

Solution Approach 1:

The lay length is optimized to a specific range (21-28 times the core diameter) to achieve the best balance between cable compactness and jacket removability. This parameter optimization ensures that the jacket can be easily removed while minimizing twist waves, resolving the contradiction between compact size and ease of operation.

Inventive Principle:

Principle #35Parameter changes

3Volume of moving object

If the lay length is short to reduce cable size, then the cable is more compact, but twist waves increase

Engineering Contradiction:

Improvecable sizeVSAvoidtwist wave reduction

Core Design Contradiction:

Volume of moving objectVSShape

Solution Approach 1:

The lay length is optimized to a specific range (21-28 times the core diameter) to achieve the best balance between cable compactness and twist wave reduction. This parameter optimization ensures that the cable remains compact while minimizing the formation of twist waves during jacket removal and cable handling.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12586694B2Multicore cable

Publication Date: 2026.03.24 SUMITOMO ELECTRIC INDUSTRIES LTD

AI summary

A multicore cable includes a core in which multiple electrical wires are twisted together, a release layer covering the core, and a jacket covering the release layer. A lay length for the multiple electrical wires is greater than or equal to 21 times and less than or equal to 28 times a long dimension of the core, and the release layer is fixed to the jacket.