Retroreflecting fabrics

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Solution Overview

Problem

Existing fabrics with retroreflectivity suffer from limited flexibility, color masking, and high production costs due to the use of high-load reflective particles and metallic layers, which restrict their application in safety and life-saving articles that require both visibility and color retention.

Innovation Solution

A retroreflecting fabric with a top layer comprising retroreflective particles embedded in a polymeric matrix, applied without a metallic or mirror layer, achieving high retroreflectivity while maintaining fabric flexibility and original color, using a thin layer with a low particle concentration to minimize scattering and absorbance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If retroreflective paint with high load of reflective particles is applied onto fabric, then retroreflectivity is improved, but fabric color is masked and flexibility is reduced

Engineering Contradiction:

ImproveretroreflectivityVSAvoidfabric flexibility

Core Design Contradiction:

Illumination intensityVSEase of manufacture

Solution Approach 1:

The patent changes the concentration parameter of reflective particles in the retroreflective composition, using a low particle load (below 90% by weight) compared to conventional high-load paints. This parameter change allows the fabric to maintain its flexibility and original color while still achieving satisfactory retroreflectivity when the fabric is crumpled or folded

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite retroreflective composition containing reflective particles embedded in a polymer matrix material. This composite structure provides both retroreflective functionality and flexibility, allowing the coating to bend with the fabric without cracking, thus maintaining fabric flexibility while achieving retroreflectivity

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If retroreflective paint with high load of reflective particles is applied onto fabric, then retroreflectivity is improved, but fabric color is masked

Engineering Contradiction:

ImproveretroreflectivityVSAvoidcolor masking

Core Design Contradiction:

Illumination intensityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the concentration parameter of reflective particles, using a low particle load (below 90% by weight) in the retroreflective composition. This reduced concentration allows the fabric's original color to remain visible in daytime conditions while still providing adequate retroreflectivity in dark conditions

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies retroreflectivity locally through a coating layer rather than using solid reflective patches. The low particle concentration allows different optical properties to coexist: the fabric maintains its original color for daytime visibility while the embedded reflective particles provide retroreflectivity when illuminated from behind

Inventive Principle:

Principle #3Local quality

3Illumination intensity

If retroreflective paint is applied onto absorbable fabric surface, then retroreflectivity is improved, but paint adhesion is poor and layers crack

Engineering Contradiction:

ImproveretroreflectivityVSAvoidpaint adhesion

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent uses a polymer matrix material as an intermediary between the fabric surface and the reflective particles. This polymer matrix acts as a bonding agent that adheres to the absorbable fabric surface while embedding and securing the reflective particles, preventing cracking and flaking

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The retroreflective composition is formulated as a composite material with polymer matrix and reflective particles. The polymer component provides adhesion to the fabric surface and flexibility to prevent cracking, while the reflective particles provide the retroreflective function

Inventive Principle:

Principle #40Composite materials

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 provides satisfactory retroreflectance in poor illumination conditions without compromising fabric flexibility or original color, enabling the manufacture of articles with large reflective surfaces at reduced production costs.

Implementation Method 1

the retroreflective composition comprising retroreflective particles at least partially embedded in a matrix of at least one embedding polymeric material

Methodology Applied

Scientific EffectRetroreflection: Retroreflector

Data Source

PatentUS11602187B2Retroreflecting fabrics

Publication Date: 2023.03.14 EREZ THERMOPLASTIC PROD AGRI COOP ASSOC LTD

AI summary

Provided are fabrics having retroreflectivity, products produced therefrom and methods of their manufacture.