Treated Walnut Shell Infill for Artificial Turf Cooling
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Solution Overview
Problem
Existing infilled artificial turfs using crumb rubber as infill material face issues such as increased temperature, health and environmental concerns, and require specific moisture levels for optimal performance, leading to maintenance challenges and potential safety hazards due to reduced shock absorption.
Innovation Solution
A top layer comprising a mixture of treated Black walnut shell particles and treated English walnut shell particles, which are processed to remove tree nut allergens and enhance durability, providing stability and consistent performance across a broader moisture range without the need for irrigation or frequent supplementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If crumb rubber is used as infill material, then resilience is provided to the artificial turf surface, but temperature increases and health/environmental concerns arise
Solution Approach 1:
The patent changes the material parameters by replacing crumb rubber with treated walnut shell particles. The walnut shells are treated with sodium bicarbonate solution to alter their surface properties, removing allergens while maintaining physical characteristics. This parameter change allows the infill to provide resilience without the harmful thermal and health effects of crumb rubber.
Solution Approach 2:
The patent uses a composite infill system combining treated walnut shell particles with sand. The walnut shells provide resilience and organic benefits, while the sand provides weight and stability. This composite approach achieves the desired performance characteristics while eliminating the harmful effects associated with pure crumb rubber infill.
2Object-affected harmful factors
If organic infill materials are used to minimize environmental concerns, then temperature is reduced via evaporative cooling, but moisture control becomes critical and maintenance complexity increases
Solution Approach 1:
The treated walnut shell infill provides self-regulating moisture management. The material's porous structure and treatment allow it to absorb and release moisture naturally without requiring external irrigation systems or active moisture control mechanisms. This self-service capability maintains evaporative cooling benefits while eliminating the need for complex moisture management infrastructure.
3Object-affected harmful factors
If walnut shell particles are treated to remove allergens, then health safety is improved, but processing complexity increases
Solution Approach 1:
The patent applies a chemical treatment parameter change using sodium bicarbonate solution to neutralize allergens on walnut shell surfaces. This single chemical treatment step effectively removes allergenic proteins while preserving the physical and mechanical properties of the walnut shells, achieving health safety without requiring multiple complex processing steps.
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 treated walnut shell mixture reduces surface temperature, maintains stability and consistency, and enhances shock absorption, mimicking natural turf conditions while eliminating environmental concerns associated with crumb rubber, and can be easily integrated into existing turf systems without complete replacement.
Implementation Method 1
One common feature of all organic infills is that they have the ability to hold moisture after rainfall, or after watering, which thereby lowers the overall temperature of the artificial turf, via evaporative cooling.
Data Source
AI summary
An infilled artificial turf surface [18] includes a particulate infill [24] with at least a top layer [28] that comprises a mixture of Black walnut shell particles [30] and English walnut shell particles [32], the walnut shell particles [30, 32] having been treated so as to eliminate or substantially remove tree nut allergens that are known to activate allergies in some humans. Preferably, treatment occurs via heat treatment in a rotary furnace, which also rounds and smoothes the particles [30, 32]. Particularly if used in the top layer [28] of a particulate infill [24] of an artificial turf surface [18], the shape and size and proportion of the Black walnut shell particles [30] and the English walnut shell particles [32] provide stability for the resulting turf surface [18], while also being able to absorb water applied thereto, thereby to hold moisture and to provide evaporative cooling of the artificial turf surface [18] for up to about five hours.