Foamed Polymer Insole with Walnut Shell Filler
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Solution Overview
Problem
Existing shoe insole materials can lead to undesirable bacterial and germ multiplication, resulting in odor issues, and lack antimicrobial and mechanical properties, while being costly and non-sustainable.
Innovation Solution
A foamed polymer matrix incorporating crushed walnut shells, which provides antimicrobial properties, improved mechanical properties, and sustainability, with the walnut shells acting as a filler to reduce polymer content and enhance durability and skin compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional foamed materials are used for shoe insoles, then basic cushioning function is provided, but bacterial and germ multiplication occurs leading to odor issues
Solution Approach 1:
The patent combines foamed polymer material with ground walnut shell particles to create a composite material that provides both cushioning and antimicrobial properties. The walnut shell particles act as a natural antimicrobial agent while the foamed polymer provides the cushioning function, resolving the contradiction between basic functionality and harmful bacterial growth.
Solution Approach 2:
The patent uses ground walnut shells, which are a renewable, inexpensive byproduct of the walnut industry, to replace expensive synthetic antimicrobial additives. This approach provides effective antimicrobial protection while being cost-effective and environmentally friendly.
2Reliability
If silver ions are added to foamed material to counteract bacteria, then antimicrobial properties are achieved, but production cost increases
Solution Approach 1:
The patent replaces expensive silver ions with ground walnut shells, which are a low-cost byproduct of walnut processing. This substitution maintains effective antimicrobial properties while dramatically reducing production costs and making the material more economically viable for mass production.
Solution Approach 2:
The patent converts walnut shells, which are waste byproducts of the walnut industry, into a valuable antimicrobial additive. This transforms a discarded material into a functional component that provides health benefits, reducing both waste and production costs.
3Strength
If higher polymer content is used to improve mechanical properties, then durability increases, but production cost and environmental impact worsen
Solution Approach 1:
The patent creates a composite where ground walnut shell particles reinforce the foamed polymer structure, providing improved mechanical properties and durability. The rigid walnut particles act as fillers and strengtheners, allowing reduced polymer content while maintaining or enhancing structural integrity.
Solution Approach 2:
The patent optimizes the particle size of ground walnut shells (0.1-2.0 mm) to achieve optimal mechanical reinforcement. By controlling particle size distribution and content (5-50 wt%), the material achieves desired mechanical properties with minimal polymer content, reducing cost and environmental impact.
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 material exhibits excellent antimicrobial properties, improved elasticity, cushioning, and durability, making it suitable for shoe insoles with reduced polymer content and lower production costs, while utilizing renewable and cost-effective walnut shell particles.
Implementation Method 1
a foamed polymer matrix which contains at least one polymer
Implementation Method 2
the particles from walnut shells also act as a filler
Data Source
AI summary
The invention relates to a material (2) comprising a foamed polymer matrix containing at least one polymer. The material is characterized in that the polymer matrix contains particles of crushed walnut shells.