Footwear Midsole Segmentation for Progressive Load Compression
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Solution Overview
Problem
Conventional single-slab polymer foams in footwear midsoles struggle to balance cushioning characteristics, either sacrificing comfort for responsiveness or vice versa, making it difficult to achieve gradient load compression.
Innovation Solution
A sole structure incorporating a cushioning element with varying stiffness ribs and pockets filled with resilient polymeric particles, allowing for customizable cushioning and responsiveness by separating the midsole into distinct regions with progressive compression properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-slab polymer foam is used in the midsole, then the structure is simple and easy to manufacture, but the cushioning characteristics cannot balance both softness and responsiveness
Solution Approach 1:
The midsole is divided into multiple slabs of polymer foam arranged in a layered configuration, with each slab having different density, hardness, or material composition. This segmentation allows each layer to provide different cushioning characteristics, enabling the overall midsole to balance both softness and responsiveness while maintaining manufacturability through modular assembly.
Solution Approach 2:
Different regions of the midsole are assigned different material properties (density, hardness, composition) to create a gradient structure. The first slab may have higher density for responsiveness, while the second slab has lower density for softness, allowing localized optimization of cushioning characteristics without requiring complex manufacturing processes.
2Ease of operation
If polymer foam is made too soft for comfort, then cushioning softness is improved, but the ability to attenuate ground-reaction forces after repeated compressions decreases
Solution Approach 1:
The midsole is segmented into multiple slabs with different material properties. The first slab uses a softer, more compliant polymer foam to provide initial cushioning and comfort, while the second slab uses a denser, more resilient polymer foam to maintain responsiveness and attenuate ground-reaction forces during repeated compression cycles.
Solution Approach 2:
The midsole employs composite construction by combining different polymer foam materials with distinct mechanical properties. The first slab may use a softer polymer foam for comfort, while the second slab uses a denser polymer foam for resilience, creating a composite structure that achieves both comfort and reliable force attenuation.
3Strength
If polymer foam is made too hard for responsiveness, then structural integrity is improved, but softness and comfort are sacrificed
Solution Approach 1:
The midsole is divided into multiple slabs where the first slab uses a softer polymer foam to provide comfort and softness, while the second slab uses a denser, more resilient polymer foam to maintain structural integrity and responsiveness. This segmentation allows each layer to optimize its material properties for its specific function.
Solution Approach 2:
The midsole utilizes composite materials by combining softer polymer foam in the first slab with denser polymer foam in the second slab. This composite structure enables the midsole to simultaneously provide softness and comfort in the upper layer while maintaining structural integrity and responsiveness in the lower layer.
4Device complexity
If a single-slab polymer foam is used, then manufacturing complexity is low, but gradient load compression from soft to responsive cannot be achieved
Solution Approach 1:
The midsole is segmented into multiple slabs arranged in a layered configuration, with each slab having different density, hardness, or material composition. This segmentation enables the midsole to achieve gradient load compression characteristics, transitioning from softer outer layers to more responsive inner layers, while maintaining reasonable manufacturing complexity through modular assembly.
Solution Approach 2:
The midsole structure transitions from a single-dimensional slab to a multi-layered three-dimensional configuration. By stacking multiple slabs with varying material properties, the design achieves gradient load compression in the vertical dimension, creating a progressive compression zone that enhances adaptability without significantly increasing manufacturing complexity.
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
Enhances comfort and responsiveness by providing a cushioned and responsive performance through progressive compression, addressing the limitations of single-slab polymer foams.
Implementation Method 1
The midsole provides cushioning for the foot and is generally at least partially formed from a polymer foam material that compresses resiliently under an applied load to cushion the foot by attenuating ground-reaction forces
Implementation Method 2
A sole structure incorporating a cushioning element with varying stiffness ribs and pockets filled with resilient polymeric particles, allowing for customizable cushioning and responsiveness by separating the midsole into distinct regions with progressive compression properties
Data Source
AI summary
An article of footwear includes a strobel having an interior surface and an exterior surface formed on an opposite side from the interior surface, the strobel defining a footbed and a peripheral wall extending transversely from the footbed to a terminal edge. The article of footwear additionally includes an upper attached to the terminal edge of the strobel along a peripheral seam to define an interior void for receiving a foot, the peripheral seam configured to extend along a side of the interior void.