Two-Faced Interlock Knit Fabric for Toothed Belt Reinforcement
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Solution Overview
Problem
Existing reinforcing fabrics for power transmission belts, such as CVT and poly v-belts, face limitations in elongation directionality and manufacturing cost, with woven fabrics restricting cog/groove formation and knitted fabrics experiencing excessive strike-through due to inter-yarn interstitial spaces.
Innovation Solution
A two-faced fabric is developed with a modified interlock knit construction, featuring a partially oriented polyester or nylon yarn plated with cotton or polyester, utilizing a blister stitch in the machine direction to achieve significant elongation in both directions without requiring fabric turning during tooth formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If woven fabric is used for reinforcement, then strike-through resistance is improved, but elongation capability is limited to one direction
Solution Approach 1:
The fabric is segmented into two distinct faces with different knit structures - Face 1 uses a tight interlock knit for strike-through resistance, while Face 2 uses a more open interlock knit for elongation capability. This segmentation allows each face to specialize in one function, resolving the contradiction between strike-through resistance and elongation capability.
Solution Approach 2:
Different regions of the fabric (the two faces) are given different local qualities through varying knit densities and structures. Face 1 has higher knit density for strike-through resistance, while Face 2 has lower knit density for elongation, allowing the fabric to exhibit both properties simultaneously in different locations.
2Adaptability or versatility
If knitted fabric is used for reinforcement, then elongation capability is improved, but strike-through resistance deteriorates due to inter-yarn interstitial spaces
Solution Approach 1:
The fabric is divided into two faces with different knit densities. Face 1 employs a tight interlock knit structure that minimizes inter-yarn interstitial spaces to prevent strike-through, while Face 2 uses a more open structure that allows elongation. This segmentation resolves the contradiction by assigning opposite functions to opposite faces.
Solution Approach 2:
The fabric combines two different knit structures (tight interlock and open interlock) in a single composite material, allowing it to exhibit both strike-through resistance and elongation capability simultaneously through the synergistic effect of its dual-face construction.
3Adaptability or versatility
If fabric is turned 90 degrees during manufacturing, then elongation direction is corrected for tooth formation, but manufacturing complexity and processing time increase
Solution Approach 1:
Instead of turning the fabric 90 degrees during manufacturing, the invention inverts the traditional approach by designing the fabric with Face 1 (tight knit) and Face 2 (open knit) oriented correctly from the start. The open Face 2 provides the necessary elongation in the longitudinal direction for tooth formation without requiring any turning or reorientation during the manufacturing process, thereby reducing complexity and processing time.
4Reliability
If tight knit construction is used, then strike-through resistance is improved, but air permeability and elongation are reduced
Solution Approach 1:
The fabric is segmented into two faces with different knit densities. Face 1 uses a tight interlock knit for strike-through resistance, while Face 2 uses a more open interlock knit that provides both air permeability and elongation capability. This segmentation allows the fabric to simultaneously achieve strike-through resistance and breathability/elongation through spatial distribution of different knit densities.
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 solution provides a cost-effective fabric with controlled strike-through and enhanced variability for tooth designs, reducing scrap rates and processing time by allowing heated molding to determine elongation properties, thus improving the efficiency and reliability of toothed belt manufacturing.
Implementation Method 1
the nature of the plated and blistered construction accompanied by the thermal dynamics defined by the partially oriented yarn when heated
Data Source
AI summary
A two-faced, modified interlock knit fabric for use in the manufacture of toothed belts, the fabric constructed by plating a partially oriented first yarn of polyester or nylon with a second yarn of polyester or spun cotton and knit in a blister stitch in the machine direction is provided. A method of forming toothed belts incorporating such a fabric is also provided.