Fishing Line Composite Yarn Core Sheath Integration
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Solution Overview
Problem
Conventional fishing lines with a core-sheath structure suffer from issues such as core and sheath separation, leading to 'nude yarn' and 'nep' formation, hardening, and inadequate specific gravity, which affects handling and performance in varying weather and tidal conditions.
Innovation Solution
A fishing line with a composite yarn structure featuring a core yarn of short fibers and a sheath yarn of long fibers, integrated using an adhesive resin, where the short fibers have a specific gravity of 1.0 or more, and the long fibers are ultra-high molecular weight polyethylene, providing adjustable specific gravity and enhanced strength and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional core-sheath fishing lines are used, then high strength and durability are achieved, but core and sheath separation occurs leading to nude yarn and nep formation
Solution Approach 1:
A binder resin is introduced as an intermediary substance between the core yarn and sheath yarn to enhance their integration. The binder resin fills the spaces between fibers and creates strong bonding interfaces, preventing separation and maintaining the structural integrity of the core-sheath construction under various fishing conditions.
Solution Approach 2:
The fishing line employs a composite material structure where the core yarn, sheath yarn, and binder resin form a multi-component system. This composite approach allows each component to contribute its specific properties (strength from core, abrasion resistance from sheath, bonding from resin) while working together to prevent separation and maintain reliability.
2Reliability
If thermal fusion bonding or binder is used to integrate core and sheath, then integration is improved, but yarn hardening and curliness occur
Solution Approach 1:
The binder resin's physical and chemical parameters are carefully controlled, including its viscosity, molecular weight, and curing characteristics. By adjusting these parameters, the resin provides sufficient bonding strength to prevent separation while maintaining flexibility and avoiding excessive hardening that would cause curliness and handling difficulties.
Solution Approach 2:
The binder resin is applied selectively at the interface between core and sheath yarns rather than uniformly throughout the entire line. This localized application ensures strong integration where needed while preserving the natural flexibility and handling characteristics of the outer sheath layer that contacts the water and environment.
3Strength
If ultra high molecular weight polyethylene fiber is used, then high strength is achieved, but specific gravity is low causing susceptibility to wind and tide
Solution Approach 1:
The fishing line combines ultra high molecular weight polyethylene fiber (providing high tensile strength) with additional materials of higher specific gravity in the core yarn or as coatings. This composite structure maintains the superior strength properties of the polyethylene while increasing overall density to reduce buoyancy and minimize the line's susceptibility to wind and tidal forces.
Solution Approach 2:
Materials with higher specific gravity are incorporated locally in specific regions of the fishing line, such as the core yarn or at strategic points along the line, rather than throughout the entire structure. This allows the line to maintain high strength where needed while increasing weight in specific areas to counteract buoyancy and reduce wind/tide influence.
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 solution prevents core and sheath separation, ensures robustness against kinking and torsion, and offers adjustable specific gravity, high tensile strength, and improved weatherability and water resistance, enhancing the fishing line's overall performance and handling.
Implementation Method 1
the core yarn and the sheath yarn being integrated with use of an adhesive resin
Implementation Method 2
the short fibers have a specific gravity of 1.0 or more
Data Source
AI summary
The present invention provides a fishing line comprising a composite yarn having a core-sheath structure, where the composite yarn comprises a core part having a core yarn containing a short fiber and a sheath part having a sheath yarn containing a long fiber; the long fiber in the sheath part and the short fiber in the core part are intertangled with each other; and the core yarn and the sheath yarn are integrated with use of an adhesive resin.The fishing line of the present invention has a robust core-sheath structure which prevents nude yarn or nep from being developed, excellent operability, adjustable specific gravity, excellent tensile strength, high weatherability and water resistance, low water content, low elongation rate, and low probability of unraveling constituent fibers at a cut site.