Polyethylene Fiber Enforced Necking Reduces Stiffness
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Solution Overview
Problem
Polyethylene fibers with high strength and elasticity exhibit excellent cut resistance but suffer from increased stiffness, which compromises processing convenience and tactile sensation in woven and knitted fabrics.
Innovation Solution
A method involving melt-extrusion of polyethylene resin followed by enforced necking in a heated collar section, with a temperature differential in the necking zone, and subsequent multi-step stretching to control fiber orientation and reduce stiffness while maintaining cut resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyethylene fibers are manufactured with high strength and elasticity through gel-spinning using organic solvent, then cut resistance is improved, but stiffness increases which compromises processing convenience and tactile sensation
Solution Approach 1:
The patent applies parameter changes by controlling the temperature profile in the heated collar section, creating a specific temperature differential between the necking zone and surrounding areas. This thermal parameter control enables enforced necking that optimizes fiber structure to achieve low stiffness while maintaining high cut resistance
Solution Approach 2:
The patent utilizes phase transitions through the heated collar section where polyethylene fibers undergo thermal processing. The temperature range of 200-300°C with a localized necking zone creates phase changes in the polymer structure that enable controlled necking and subsequent low-stiffness high-strength fiber formation
2Strength
If polyethylene fibers are manufactured with high strength and elasticity, then cut resistance is improved, but tactile sensation and wearing comfort deteriorate due to increased stiffness
Solution Approach 1:
The patent uses parameter changes by implementing a specific temperature profile with a necking zone that is 50-100°C higher than surrounding areas. This controlled thermal parameter change creates optimal conditions for fiber necking that reduces stiffness and improves tactile sensation while preserving cut resistance
Solution Approach 2:
The patent applies local quality by creating a localized heated necking zone within the heated collar section. This localized thermal treatment creates a specific structural region in the fiber that optimizes both mechanical properties and tactile characteristics without affecting the entire fiber uniformly
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 resulting polyethylene fibers have a low stiffness index, excellent cut-resistance, and improved processing convenience and tactile feel in fabric applications.
Implementation Method 1
passing the polyethylene undrawn yarn through a heated collar section with a process of enforced necking the polyethylene undrawn yarn in an enforced necking zone in the heated collar section
Implementation Method 2
The enforced necking zone may have a temperature higher by 50° C. to 100° C. than the surrounding heated collar section
Data Source
AI summary
The present disclosure relates to a polyethylene fiber and a method for preparing thereof, and more particularly to a polyethylene fiber, a method for preparing thereof, and an apparatus for preparing thereof, which has excellent wearing and touch sensation with processing convenience into woven fabrics and knitted fabrics in use in applied products by reducing the stiffness of fiber having the same physical properties using an enforced necking method in a spinning process.