Footwear Sole Molding with Independent Compression Regions
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Solution Overview
Problem
Conventional steam chest molding methods for footwear sole components result in non-uniform density due to fixed mold gaps, leading to uneven compression and density distribution across different regions, such as the heel and forefoot, which cannot be independently controlled.
Innovation Solution
A molding system with a movable mold part that allows for controlled compression regions and reference compression regions, enabling the customization of compression percentages and densities across different areas of the sole component by adjusting the mold gap and bead distribution during the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fixed mold gap is used in conventional steam chest molding, then the manufacturing process is simple, but the density distribution becomes non-uniform across different regions of the sole component
Solution Approach 1:
The mold cavity is divided into multiple independent regions (first region and second region) with different mold gaps. The first mold part defines a first mold gap for the first region while the second mold part defines a second mold gap for the second region, allowing independent control of compression and density in each region.
Solution Approach 2:
Different regions of the mold cavity are assigned different local properties through varying mold gap dimensions. The first region has a first mold gap size optimized for its specific thickness and density requirements, while the second region has a second mold gap size optimized for its different requirements, achieving local optimization of density uniformity.
2Manufacturing precision
If the mold gap is reduced to compress foam beads, then the density increases, but the compression becomes uneven across regions with different thicknesses
Solution Approach 1:
The mold structure transitions from a static fixed gap design to a dynamic multi-gap design where the first mold part and second mold part can be independently positioned. This allows the mold gaps to be dynamically adjusted to match the varying thickness requirements of different sole component regions, ensuring uniform compression ratios across all regions.
Solution Approach 2:
The mold gap parameter is changed from a single fixed value to multiple region-specific values. The first mold gap and second mold gap are differently sized to compensate for the thickness variations in different sole component regions, transforming the compression parameter to achieve uniform density distribution.
3Device complexity
If a single mold cavity is used for the entire sole component, then the device complexity is low, but the ability to control differential densities in different regions is lost
Solution Approach 1:
The single mold cavity is segmented into multiple controllable regions defined by separate mold parts. The first mold part and second mold part independently define different mold gaps within the same cavity, enabling regional density control while maintaining the integrated cavity structure.
Solution Approach 2:
The multi-gap mold structure serves multiple functions: it maintains a unified mold cavity for efficient manufacturing while simultaneously providing independent density control for different sole component regions, combining the benefits of simple device structure with advanced customization capability.
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 ensures that regions with varying thicknesses, like the heel and forefoot, can have tailored densities, achieving uniform or differential densities as needed, thereby improving the manufacturing precision and quality of footwear soles.
Implementation Method 1
manufacturing sole components from foam beads
Implementation Method 2
The beads are then fused together by heating the beads in a process known as steam chest molding
Data Source
AI summary
A system and method for molding a component within a molding system having a mold cavity that includes at least one controlled compression region associated with and adjacent to a movable mold part. In one embodiment, the mold cavity may include a reference compression region for which the movable mold part is configured to substantially avoid affecting or to substantially act independently, or both.