Variable Thickness Spacer Fabric via Dynamic Knitting
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Solution Overview
Problem
Traditional spacer fabric production methods result in uniform thickness, making it difficult to apply the fabric in products requiring varied thicknesses, such as shoe-pads, without additional processing.
Innovation Solution
A thickness-controlled knitting method where the length of yarns in the middle layer is gradually increased or decreased, and the knitted angle is varied to adjust the distance between the top and bottom layers, allowing for the production of spacer fabrics with variable thickness by inflating the middle layer with air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional uniform thickness knitting method is used, then manufacturing process is simple, but the spacer fabric cannot meet requirements for varied thickness products
Solution Approach 1:
The knitting machine is configured to dynamically adjust yarn feed length and knitting parameters during the knitting process. The middle layer yarns are fed with varying lengths in different rows, and the knitting needle selection is dynamically changed to create the gradient thickness structure, transforming a static uniform thickness process into a dynamic variable thickness process
Solution Approach 2:
Different regions of the spacer fabric are knitted with different yarn lengths and knitting densities. The middle layer yarns have locally varied lengths where yarns in certain rows extend further than others, creating local thickness variations. This allows different parts of the fabric to have different thickness characteristics suitable for specific application requirements
2Adaptability or versatility
If additional processing is applied to uniform spacer fabric to create varied thickness, then thickness variation is achieved, but production time and labor increase
Solution Approach 1:
The variable thickness structure is built into the spacer fabric during the knitting process itself, before the fabric is completed. By pre-configuring the knitting machine to feed yarns of different lengths and select different needles for different rows, the thickness variation is created in advance during manufacturing, eliminating the need for subsequent cutting, stacking, or bonding operations to achieve varied thickness
3Length of moving object
If middle layer yarns are made longer to increase thickness, then spacer distance increases, but fabric becomes less stable
Solution Approach 1:
The middle layer is divided into multiple segments with different yarn lengths arranged in specific patterns. Instead of using one uniformly long yarn throughout, the fabric incorporates short, medium, and long yarn segments in different rows and columns. This segmentation allows the fabric to maintain overall structural stability while creating localized thickness variations through the strategic placement of longer yarn segments
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
Enables the creation of spacer fabrics with customizable thicknesses without additional processing, suitable for applications like shoe-pads, reducing production time and labor.
Implementation Method 1
filling air through the air inlet to inflate the middle layer, the inflated middle layer having a height according to the length of the yarn
Data Source
AI summary
In a structure of a spacer fabric and a thickness-controlled knitting method for producing the same are disclosed, the method includes knitting a yarn into a three laminated layer fabric, and the three laminated layer fabric includes a top layer, a middle layer and a bottom layer, wherein the middle layer has one end connected with the top layer and the other end connected with the bottom layer; and the spacer fabric has its thickness determined by a length and a knitted angle of the yarn of the middle layer; when in the knitting process, the length of each yarn of the middle layer is gradually decreased/increased and the knitted angle of each yarn of the middle layer is varied, thereby gradually increasing or decreasing the thickness of the spacer fabric.