Multifilament Yarn Twisting for Knot Strength and Circularity
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Solution Overview
Problem
Conventional fishing lines with high strength often suffer from tangling issues due to their circularity, which affects knot strength and durability, and improving knot strength degrades circularity, leading to unnatural light reflection and reduced tensile strength.
Innovation Solution
A multifilament yarn is subjected to two twisting processes in opposite directions with a thermoplastic resin coating, where the first twist is applied in one direction and the second twist in the opposite direction, maintaining circularity while enhancing knot strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a twisted multifilament yarn is used to improve knot strength, then the yarn spins and becomes tangled with the guide of the fishing rod
Solution Approach 1:
The patent applies a specific twist ratio parameter (value obtained by dividing a value twice as large as the ratio of number of twists between preliminary twist and final twist by the number of multifilament yarns) within the range of 1.2 to 2.5, which optimizes the balance between knot strength and anti-tangling properties by controlling the degree and direction of twisting
2Strength
If the circularity is degraded to improve knot strength, then the fishing line unnaturally reflects light, causing fish to have a sense of caution and tensile strength decreases
Solution Approach 1:
The patent maintains circularity by controlling the flattening ratio within a specific range while applying the optimized twist ratio, ensuring that the yarn cross-section remains sufficiently circular to avoid unnatural light reflection and maintain tensile strength, even as knot strength is improved
3Strength
If a twisted synthetic fiber multifilament yarn is wound around a core yarn to achieve high strength, then the fishing line spins and becomes tangled
Solution Approach 1:
The patent uses a single multifilament yarn subjected to controlled twisting with a specific twist ratio rather than winding sheath yarn around a core yarn, which eliminates the spinning and tangling issue while maintaining high breaking strength through the optimized twist parameters
Data Source
AI summary
The present application of the invention aims at improving knot strength of a twisted yarn without compromising circularity, with respect to various yarns including a fishing line. For such purpose, the present application of the invention provides a yarn including a multifilament subjected to two twisting processes in different directions, and a coating resin that covers a surface of the multifilament; wherein the multifilament is subjected to a first twist in one direction, and then to a second twist in a direction opposite to that of the first twist, without being doubled with another yarn.