Dual-Layer Knitted Shoe Upper for Elasticity and Fit
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Solution Overview
Problem
Achieving a good fit and sufficient longitudinal elasticity in sports shoes with knitted uppers is challenging, particularly in the forefoot and heel areas, which affects seating comfort.
Innovation Solution
A dual-layer knitted material structure is used, where a more elastic first layer is covered partially by a less elastic second layer, with the second layer forming transverse strips in the forefoot and heel areas, creating a flex zone for improved adaptability and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a knitted material is used for the shoe upper, then production efficiency is improved, but achieving sufficient longitudinal elasticity and good fit becomes more difficult
Solution Approach 1:
The knitted upper is divided into multiple layers with different functional characteristics. The first knitted layer provides longitudinal elasticity through its knit structure, while the second non-knitted layer provides transverse stability. This segmentation allows each layer to specialize in providing specific elastic properties without compromising the other direction's performance.
Solution Approach 2:
The invention uses a composite structure combining a knitted material layer with a non-knitted material layer. The knitted layer (first layer) offers high longitudinal stretch, while the non-knitted layer (second layer) provides dimensional stability and transverse support. This composite approach merges the advantages of both material types to achieve both productivity and adaptability.
2Ease of manufacture
If a single-layer knitted material is used, then manufacturing simplicity is maintained, but fit precision and seating comfort deteriorate
Solution Approach 1:
The upper is segmented into two distinct layers: a knitted layer for longitudinal elasticity and a non-knitted layer for transverse stability. This segmentation enables precise control over fit characteristics in different directions while maintaining relative manufacturing simplicity through layered construction.
Solution Approach 2:
Different regions of the upper receive different material characteristics through the layered structure. The knitted layer provides localized longitudinal stretch where needed, while the non-knitted layer provides localized transverse stability. This local quality differentiation improves fit precision without requiring complex manufacturing processes throughout the entire upper.
3Stability of the object's composition
If the second layer completely covers the first layer, then transverse stability is improved, but longitudinal elasticity deteriorates
Solution Approach 1:
The second non-knitted layer is selectively positioned to cover specific areas of the first knitted layer, particularly in regions requiring transverse stability. By not completely covering the first layer, the design preserves longitudinal elasticity in areas where the knitted structure remains exposed, while providing transverse stability where the non-knitted layer is present.
Solution Approach 2:
Instead of completely covering the knitted layer with the non-knitted layer, the invention uses partial coverage. This partial action allows the non-knitted layer to provide transverse stability in critical areas while leaving the knitted layer's longitudinal elasticity intact in other areas, achieving a balance between the two opposing requirements.
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 dual-layer structure enhances the shoe's longitudinal elasticity while maintaining transverse stability, providing a precise fit and improved wearing comfort, especially in the forefoot and heel areas.
Implementation Method 1
The first thread from which the first layer of material consists preferably has a higher elasticity than the second thread from which the second layer of material consists. The elasticity of the first thread is preferably at least twice as great as the elasticity of the second thread.
Implementation Method 2
the shoe upper consists of a knitted material that forms the outer surface of the shoe upper... to ensure sufficient longitudinal elasticity and at the same time a good fit
Data Source
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AI summary
The invention relates to a shoe (1), in particular a sports shoe, having an upper (2) and a sole (3), which is connected to the upper (2), wherein the upper (2) has, at least in part, a knitted material forming its outer surface (4). In order to ensure sufficient longitudinal elasticity in the forefoot region and a good fit, along with efficient production, the invention makes provision for the knitted material to consist of a first knitted material layer (5), which is produced from a first thread, wherein the first material layer (5) has arranged on it a second knitted material layer (6), which is produced from a second thread, wherein the second material layer (6) covers the first material layer (5) at least in part, wherein, in the region of the front half, as seen in the longitudinal direction (L) of the shoe (1), and/or in the heel region (9) of the shoe (1), the second material layer (6) runs, at least in part, in strip form in a direction transverse (Q) to the longitudinal direction (L) of the shoe (1), wherein, in this region, the second material layer (6) forms a number of strips (7) running parallel to one another.