Spacer Fabric Tether Segmentation for Layer Separation
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Solution Overview
Problem
Existing methods for forming spacer fabrics are limited in achieving precise control over the distance between fabric layers and are constrained by the structural distance between knitting machine needle beds, resulting in restricted thickness and non-uniform shrinkage issues.
Innovation Solution
A method involving iterative tether segment formation using a knitting machine, where tethers are extended and temporarily held at specific points on fabric layers to increase the distance between them, allowing for the selection of tether lengths and angles to achieve greater thickness, up to and beyond 38.1 mm, without relying on material shrinkage or structural constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If traditional knitting methods are used to form spacer fabrics, then the fabric layers are connected by tethers, but the distance between fabric layers is limited by the structural distance between knitting machine needle beds
Solution Approach 1:
The tether is divided into multiple segments formed through iterative knitting processes. Each iteration creates a portion of the tether between temporary holding needles, allowing the total tether length to exceed the fixed distance between needle beds. The tether is constructed in discrete segments that accumulate to achieve the desired fabric layer separation.
Solution Approach 2:
Temporary holding needles are positioned in advance to establish the full length of the tether before the fabric layers are knitted together. This preliminary positioning of holding needles allows the tether to be pre-formed to the exact required length, ensuring precise control over the distance between fabric layers independent of needle bed constraints.
2Length of stationary object
If material shrinkage is used to increase fabric thickness, then some thickness can be achieved, but non-uniform shrinkage issues occur
Solution Approach 1:
The invention replaces the thermal or chemical shrinkage mechanism with a mechanical tether system. Instead of relying on material shrinkage to create spacing, rigid or semi-rigid tether elements are knitted into the fabric structure to mechanically maintain the desired distance between layers, eliminating non-uniform shrinkage problems.
3Manufacturing precision
If the iterative tether segment formation process is used, then precise control over layer separation is achieved, but the knitting process complexity increases
Solution Approach 1:
The knitting process incorporates dynamic elements where temporary holding needles are systematically advanced and repositioned during the iterative process. This dynamic adjustment of holding needle positions allows precise control over tether length and layer separation while maintaining a manageable process through systematic repetition of standardized iterations.
Data Source
AI summary
A method of forming a spacer fabric includes performing, via a knitting machine, an iterative process. The iterative process includes: knitting a tether from a first point to a second point on a first fabric layer; extending the tether from the second point to a third point on a second fabric layer to start formation of a tether segment; temporarily holding the tether at the third point via one of a temporary holding needles; extending the tether from the third point to a fourth point on the first fabric layer; temporarily holding the tether at the fourth point via another one of the temporary holding needles; extending the tether from the fourth point to a fifth point on the second fabric layer; and knitting the tether from the fifth point to a final point on the second fabric layer. The tether segment is released from the temporary holding needles.