Phosphorescent Retroreflective Fluorescent Firefighter Trim Visibility
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Solution Overview
Problem
Conventional combined retroreflective and fluorescent trim materials on firefighter garments are ineffective in providing visibility in dark or smoke-filled environments without an external light source, as retroreflective materials rely on external light for reflection and fluorescence ceases without exposure to light.
Innovation Solution
A combined phosphorescent, retroreflective, and fluorescent article is developed, featuring a phosphorescent layer under a retroreflective and fluorescent sheet, where the phosphorescent layer remains visible for an extended period, enhancing visibility regardless of light exposure, with the phosphorescent layer comprising a mixture of adhesive and phosphorescent pigment, and a top coat for durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional combined retroreflective and fluorescent trim materials are used on firefighter garments, then visibility is improved when exposed to external light sources, but visibility is lost in dark or smoke-filled environments without external light sources
Solution Approach 1:
The patent combines three different light-interaction mechanisms (retroreflection, fluorescence, and phosphorescence) into a single trim material system. The retroreflective layer reflects external light back to the source, the fluorescent layer emits light during exposure, and the phosphorescent layer stores and slowly releases light after exposure, creating a multi-functional visibility solution that works across different lighting conditions including dark environments
Solution Approach 2:
The trim material is constructed as a composite structure with multiple functional layers: a retroreflective layer containing glass beads or prisms, a fluorescent layer with fluorescent pigments, and a phosphorescent layer with phosphorescent pigments. Each layer contributes a different light-interaction mechanism, and their combination creates a material that maintains visibility reliability across varying environmental conditions
2Illumination intensity
If retroreflective materials are used to increase visibility, then light reflection is enhanced when light sources are present, but the materials become ineffective in the absence of external light sources
Solution Approach 1:
The retroreflective layer is designed to perform its primary function of reflecting external light back to the source when light sources are present, while the underlying phosphorescent layer provides a backup light-emission function when external light sources are absent. This multi-functionality ensures the trim material adapts to different lighting conditions, maintaining visibility whether in well-lit or dark environments
3Illumination intensity
If fluorescent materials are used to enhance visibility, then light emission is increased during light exposure, but fluorescence stops once light source exposure ceases
Solution Approach 1:
The phosphorescent layer is designed to store light energy during periods when external light sources are present, accumulating energy that can be released later. This preliminary energy storage action during light exposure enables the material to continue emitting light after the external light source has ceased, extending the duration of visibility beyond the period of direct light exposure
4Illumination intensity
If combined retroreflective and fluorescent trim materials are secured to firefighter garments, then conspicuity is improved in daylight and with light sources, but visibility is compromised in smoke-filled environments where light sources cannot reach the garment
Solution Approach 1:
The phosphorescent layer is designed to be self-sufficient by storing light energy during exposure and autonomously releasing it over time without requiring continuous external light sources. This self-service capability allows the trim material to maintain visibility in smoke-filled environments where external light sources may be blocked, as the phosphorescent layer draws on its stored energy reserves rather than requiring ongoing external illumination
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 solution significantly increases the conspicuity of firefighters by maintaining visibility over time, even in environments without external light, through the phosphorescent layer's prolonged emission of light, surpassing the limitations of conventional materials.
Implementation Method 1
a combined phosphorescent, retroreflective and fluorescent article comprising a substrate, a phosphorescent layer on at least one side of the substrate
Implementation Method 2
Retroreflective materials are those that reflect light back to its source with a minimum of scattering
Implementation Method 3
Fluorescent materials on the other hand emit electromagnetic radiation at visible wavelengths longer than those absorbed
Data Source
AI summary
The present invention relates to a combined phosphorescent, retroreflective and fluorescent article comprising a substrate, a phosphorescent layer on at least one side of the substrate and a retroreflective and fluorescent sheet provided over the phosphorescent layer, wherein the retroreflective and fluorescent sheet is configured so that at least 5% of visible area of said one side is phosphorescent.