Biodegradable Shoe Liner with Asymmetric Adhesive Layer
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Solution Overview
Problem
Existing shoe liners are expensive, difficult to use, not biodegradable, and not interchangeable between left and right shoes, making them unsuitable for high-heeled shoes and requiring specific designs for each foot.
Innovation Solution
A biodegradable shoe liner with a first layer of absorbent cellulose fibers impregnated with deodorant and a second moisture-proof layer with adhesive backing, designed to fit either foot and suitable for high-heeled shoes, made by bonding and cutting the layers to fit symmetrically for universal use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional shoe liners are designed specifically for right or left foot, then they provide better fit and comfort, but they cannot be interchangeable between shoes
Solution Approach 1:
The patent applies asymmetry by creating a liner with distinct top and bottom surfaces that have different properties. The top surface has a first pattern (e.g., higher absorbency, different texture) while the bottom surface has a second pattern (e.g., lower absorbency, adhesive properties). This asymmetric design allows the liner to be placed only in the correct orientation, preventing interchangeability while optimizing fit and comfort for each surface's function.
Solution Approach 2:
The patent applies inversion by flipping the traditional concept of interchangeable liners. Instead of making liners identical on both sides for interchangeability, the invention makes them deliberately non-interchangeable by giving each side unique characteristics. The top surface is optimized for contact with the foot (high absorbency, soft texture) while the bottom surface is optimized for contact with the shoe insole (adhesive, low absorbency), creating a one-way fit system.
2Reliability
If shoe liners are made with multiple functional layers, then they provide better sweat absorption and odor combat, but they become more expensive and difficult to manufacture
Solution Approach 1:
The patent applies composite materials by combining multiple functional layers into a single integrated liner structure. The liner includes a top layer with high sweat absorbency and odor-fighting properties, a middle layer for structural support and moisture wicking, and a bottom layer with adhesive properties for secure attachment. These composite layers are manufactured together as one unit, providing enhanced functionality while streamlining the manufacturing process through integrated production.
Solution Approach 2:
The patent applies merging by combining multiple functions into fewer layers. Instead of separate removable layers for absorbency, odor control, and adhesion, the invention integrates these functions into a single multi-layered liner that is manufactured as one piece. The top surface combines absorbent and odor-fighting materials, while the bottom surface integrates adhesive properties, reducing assembly steps and manufacturing complexity.
3Duration of action of stationary object
If shoe liners are made non-biodegradable for durability, then they last longer and can be reused, but they harm the environment when disposed
Solution Approach 1:
The patent applies the disposable principle by designing a liner that is optimized for single-use or limited-use applications. The liner is made from biodegradable materials that can be safely disposed of after use, eliminating environmental harm. The design focuses on providing sufficient performance for the intended usage period (typically one wear cycle or a few wears) rather than aiming for long-term durability, allowing the entire liner to be discarded responsibly without ecological impact.
Solution Approach 2:
The patent applies parameter changes by selecting materials with specific biodegradability parameters. The liner is constructed from naturally degradable materials such as cotton, bamboo, or other organic fibers that break down safely in the environment. By changing the material composition parameter from synthetic durable materials to biodegradable natural materials, the invention achieves environmental compatibility while maintaining adequate functional performance for the intended short-term use period.
4Adaptability or versatility
If shoe liners are designed to fit high-heeled shoes, then they provide comfort and absorption, but they require specific designs that cannot be used with regular shoes
Solution Approach 1:
The patent applies universality by designing a liner with a neutral, symmetrical shape that can be inserted into either a left or right shoe regardless of shoe type. The liner features a generally rectangular or oval form factor with rounded corners that accommodates various shoe contours including high-heeled shoes, flat shoes, and boots. The top surface is designed with uniform absorbency and texture patterns that work effectively across different shoe styles, eliminating the need for style-specific designs.
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 an inexpensive, comfortable, and environmentally friendly shoe liner that absorbs sweat and odors, is disposable, and can be used with either foot, offering a sanitary option for shoe try-ons and fitting various shoe types without leaving residues.
Implementation Method 1
a first layer made of an absorbent material that is impregnated with a deodorant
Implementation Method 2
cellulose fibers of natural origin, the first layer having a top side and a bottom side, impregnating the first layer with a substance that absorbs moisture
Implementation Method 3
a second layer made of a moisture proof material with an adhesive backing
Implementation Method 4
a second layer made of a moisture proof material with an adhesive backing
Data Source
AI summary
A biodegradable and disposable shoe liner is made of a first layer impregnated with a deodorant and an absorbent, a second layer made of a moisture-resistant material, and an adhesive layer on the bottom side of the second layer for temporary attachment to the foot bed of a shoe. A peel-off layer of paper covers the adhesive layer to prevent the shoe liners from sticking to each other or other objects before use.