Insulated Shoe Footbed Molding Microfiber Protection
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Solution Overview
Problem
Existing shoe footbeds using thermal insulation with polymeric microfibers face challenges in maintaining loft and heat retention due to compression and heat-related damage during molding processes, leading manufacturers to avoid using low melting point microfiber-containing webs.
Innovation Solution
A method of creating a shoe footbed by first molding a shape-retaining layer and then juxtaposing a thermal insulation layer with polymeric microfibers, followed by additional layers, ensuring the insulation is not exposed to heat during molding, thus preserving its structural properties and loft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal insulation containing polymeric microfibers is used in shoe footbeds, then heat retention is improved, but the microfibers are damaged by heat during molding operations
Solution Approach 1:
The footbed is divided into separate layers: a heat-resistant shape-retaining layer and a heat-sensitive microfiber insulation layer. By segmenting the structure, the insulation layer is protected from direct exposure to molding temperatures, resolving the contradiction between achieving heat retention and preventing heat damage to microfibers.
Solution Approach 2:
The shape-retaining layer is molded first before the microfiber insulation layer is added. This preliminary action ensures that the insulation layer is not exposed to heat during the molding process, preserving its thermal performance while still achieving the desired footbed shape.
2Reliability
If non-woven microfibrous webs are subjected to compression, then web loft is reduced, but heat retention capabilities are maintained
Solution Approach 1:
The microfiber insulation layer is designed with specific local properties including adequate thickness and loft to maintain heat retention. The layer is positioned and configured to preserve its insulating characteristics while accommodating the footbed structure, thus maintaining both heat retention capabilities and web loft.
3Shape
If molding operations are performed at temperatures at or above the melting temperature of microfibers, then shape adaptation is achieved, but microfiber integrity is compromised
Solution Approach 1:
The shape-retaining layer acts as an intermediary between the molding process and the microfiber insulation layer. This intermediate layer absorbs the heat and mechanical stress of molding operations, protecting the microfibers from direct exposure to high temperatures and pressure while still enabling the footbed to achieve its anatomical shape.
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
This approach allows for the creation of shoe footbeds with lofty microfibrous insulation that maintains thermal performance and integrity, providing better heat retention and comfort while avoiding damage from heat and pressure during manufacturing.
Implementation Method 1
thermal insulation that contains polymeric microfibers has been known for many years. This insulation is commonly used in jackets and sleeping bags to provide heat retention
Data Source
AI summary
A shoe footbed 10 made by first molding a shape-retaining layer 12 into a contoured condition. After the shape-retaining layer 12 has been molded, a layer of thermal insulation 14 is placed on top of the molded layer 12. A conforming layer 16 and a fabric top layer 18 may be placed over the thermal insulation 14 and the shape-retaining layer 12. The inventive method of manufacture is particularly suited for making insulated footbeds that contain nonwoven webs of polymeric microfiber because damage to the fibrous web from heat and compression may be avoided.