Laser Marking on Armored Cable Sheath

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Solution Overview

Problem

Conventional methods for marking armored electrical cables with coded information on metallic sheaths are impractical due to material and surface irregularities, leading to durability issues, increased costs, and readability problems, especially for large cables.

Innovation Solution

The use of laser etching to create coded information within the conductive outer sheath of armored electrical cables, which maintains conductivity and visibility even on non-planar surfaces, by aligning the cable with a designated focal point in a laser printing apparatus to ensure precise and durable markings.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional printing methods are used to mark armored cable, then marking can be applied, but the print becomes unreadable due to non-planar surface and deteriorates over time

Engineering Contradiction:

Improvemarking durabilityVSAvoidreadability

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent replaces conventional mechanical printing systems with laser-based marking technology. The laser system uses optical energy to permanently mark the cable surface, eliminating the deterioration issues associated with conventional ink-based printing methods while maintaining readability through precise focal point control on the non-planar surface

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the physical state and properties of the marking process by using laser energy to alter the surface properties of the cable. The laser marking creates permanent visual changes through controlled material modification, transforming the marking from a superficial application to an integrated surface feature that resists deterioration

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If labels are attached to the exterior of armored cable, then coded information can be applied, but labels become susceptible to damage and tearing during installation

Engineering Contradiction:

Improvemarking applicationVSAvoidmarking durability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent merges the marking process directly with the cable surface by etching or burning the coded information into the cable's outer jacket. This integration eliminates the separate label component entirely, combining the cable structure and identification marking into a single unified system that cannot detach or tear during installation

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The laser beam serves as an intermediary that transfers coded information directly onto the cable surface without requiring physical label materials. The energy from the laser acts as a mediator to create permanent markings, eliminating the need for adhesive labels that are prone to damage

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If indenting method is used to identify cable, then permanent identification is achieved, but contrast is insufficient and character size is limited

Engineering Contradiction:

Improveidentification permanenceVSAvoididentification visibility

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent changes the visual parameters of the marking by using laser energy to create high-contrast markings on the cable surface. The laser can produce dark, deeply etched characters with excellent contrast against the cable background, and can vary character size independently of the cable diameter, overcoming the limitations of indentation depth and width

Inventive Principle:

Principle #35Parameter changes

4Loss of information

If color coding is used on armor, then cable characteristics can be indicated, but colors are susceptible to deterioration and becoming unrecognizable

Engineering Contradiction:

Improveinformation transmissionVSAvoidcolor durability

Core Design Contradiction:

Loss of informationVSReliability

Solution Approach 1:

The patent replaces color-based identification systems with laser-marked visual patterns. Instead of relying on colored coatings that fade and deteriorate, the laser creates permanent monochromatic markings through material modification, eliminating chromatic deterioration while maintaining information transmission through pattern and character recognition

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

This method provides permanent, legible, and easily readable coded information on armored electrical cables, maintaining conductivity and reducing material costs while withstanding environmental factors like oxidation and high temperatures.

Implementation Method 1

configuring a laser to etch coded information on the outer surface of the armored electrical cable

Methodology Applied

Scientific EffectLaser ablation: Laser Ablation

Implementation Method 2

providing a laser printing apparatus having a lens with a designated focal point length

Methodology Applied

Scientific EffectFocusing: Focusing

Data Source

PatentUS9040825B2Conductors and metal-covered cable with coded information and method of applying coded information

Publication Date: 2015.05.26 SOUTHWIRE CO LLC

AI summary

A metal-clad cable assembly comprising a metal sheath disposed around a conductor assembly. The metal sheath contains spaced apart crowns and valleys defining an outer surface of the metal sheath. The cable assembly includes coded information formed within the metal sheath, the coded information providing a characteristic and/or an intended application of the metal-clad cable assembly.