Retroreflective Cable Sheath Composition for Low-Visibility Mining
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Solution Overview
Problem
Electrical cables used in mining operations face challenges in low visibility environments, leading to damage and increased safety risks due to their limited visibility and durability in harsh conditions, which existing solutions fail to adequately address while maintaining fire-retardant properties.
Innovation Solution
An electrical cable with a transparent or translucent outer sheath containing uniformly distributed retroreflective and phosphorescent particles, free of dedicated color pigments, providing improved visibility in various lighting conditions and maintaining high-visibility characteristics even under wear, along with integrated fire-retardant properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the outer sheath contains dedicated color pigments to improve visibility, then the visibility of the cable is improved, but the retroreflective and phosphorescent properties are impeded due to light blocking
Solution Approach 1:
The patent applies color changes by using retroreflective particles with distinct colors (yellow, orange, red, green, blue, purple, pink) that inherently provide color indication without requiring additional pigments. The particles' optical properties enable them to reflect light back to the source while maintaining their distinct colors, thus improving visibility without compromising retroreflective functionality.
Solution Approach 2:
The outer sheath is formulated as a composite material containing a transparent or translucent matrix combined with retroreflective particles and phosphorescent particles. This composite structure allows light to pass through the matrix to reach the particles, enabling both the matrix's transparency and the particles' retroreflective/phosphorescent properties to function simultaneously without interference from pigments.
2Duration of action of stationary object
If a separate protective layer is added to protect high-visibility characteristics from wear, then the durability of visibility properties is improved, but the fire-retardant properties are compromised
Solution Approach 1:
The patent changes the parameter of particle distribution from surface-level to uniformly distributed throughout the outer sheath's cross-section. This ensures that high-visibility characteristics are maintained even as the outer surface wears, while the entire outer sheath composition is optimized for fire-retardant properties without requiring a separate protective layer.
Solution Approach 2:
The outer sheath is designed to perform multiple functions simultaneously: it provides fire-retardant protection, maintains high-visibility characteristics through uniformly distributed particles, and resists wear. This multi-functional design eliminates the need for a separate protective layer that would compromise fire-retardant properties.
3Reliability
If the outer sheath is made opaque to block out dedicated pigments, then the fire-retardant properties are improved, but the retroreflective and phosphorescent properties are reduced due to light blocking
Solution Approach 1:
The outer sheath is formulated as a composite material with a transparent or translucent matrix that allows light to pass through to the retroreflective and phosphorescent particles. This transparency is maintained while incorporating fire-retardant additives into the matrix composition, achieving both optical functionality and fire safety without requiring opacity.
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 cable achieves enhanced visibility and safety in low-light conditions, reducing tripping and collision risks while maintaining fire-retardant properties and wear resistance, promoting extended use in harsh mining environments.
Implementation Method 1
the retroreflective particles increase the visibility of the electrical cable in direct lighting conditions
Implementation Method 2
the phosphorescent particles improve the visibility of the electrical cable in in dark lighting conditions subsequent to a preceding illumination thereof
Data Source
Figure 1~2
Figure 3
AI summary
An electrical cable (1), comprising one or more conductors (2) each being provided with a respective, surrounding insulating layer (2a) for electrically insulating their respective conductor (2) from the remaining cable (1), and an outer sheath (5) surrounding at least the one or more conductors (5). The outer sheath (5) comprises a thermoplastic or thermoset matrix, in addition to retroreflective particles and phosphorescent particles, both uniformly distributed within the outer sheath (6). The retroreflective particles are of a distinct colour. The matrix of the outer sheath (5) is transparent or translucent, and is substantially free of dedicated colour pigments not forming a part of functional particles including the retroreflective particles, phosphorescent particles and fire-retardants.