Synthetic Fiber Viscoelasticity for Dyeability and Soft Texture
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Solution Overview
Problem
Existing synthetic fibers face challenges in achieving both excellent dye exhaustion ability and soft texture, with previous techniques leading to excessive shrinkage, denseness, or hardening of the fiber structure, and inefficient energy consumption in the dyeing process.
Innovation Solution
A synthetic fiber with a loss tangent peak temperature of 100° C. to 150° C., a loss tangent peak value of 0.15 or more, and a dry heat shrinkage of 5% to less than 15%, optimized for improved dyeability and texture through controlled micro Brownian motion and dye penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature heat treatment is applied to change fiber structure before dyeing, then dye exhaustion ability is improved, but dry heat shrinkage becomes excessively large and fiber structure becomes dense and hardened
Solution Approach 1:
The patent applies parameter changes by precisely controlling the loss tangent peak temperature (Tg) within 80-120°C and loss tangent peak value (tanδ) within 0.20-0.40 through copolymerization composition adjustment. This controlled parameter modification creates optimal micro Brownian motion that improves dye penetration without causing excessive shrinkage or hardening, resolving the contradiction between dye exhaustion ability and fiber structure quality.
2Temperature
If normal pressure dyeability is improved by controlling tan δ peak temperature, then dyeing can be performed at normal pressure, but dry heat shrinkage increases and texture hardens due to dense structure
Solution Approach 1:
The patent changes the Tg and tanδ parameters to specific ranges (Tg: 80-120°C, tanδ: 0.20-0.40) that enable normal pressure dyeing while simultaneously controlling dry heat shrinkage to 5-15%. This precise parameter control allows the fiber to achieve good dyeability at normal pressure without developing excessive density or hard texture.
3Reliability
If dye exhaustion ability is improved through fiber structure modification, then color development property is excellent, but energy consumption increases due to additional processing steps
Solution Approach 1:
The patent applies preliminary action by incorporating copolymerization components during the fiber production stage itself, rather than requiring separate post-production treatments. This preliminary modification of the polymer structure during manufacturing enables excellent color development property while avoiding the need for additional energy-consuming processing steps later.
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 fiber achieves deep color development with fast dyeing speed and maintains a soft texture, while minimizing shrinkage and energy consumption.
Implementation Method 1
optimized for improved dyeability and texture through controlled micro Brownian motion and dye penetration
Implementation Method 2
having a loss tangent peak temperature of 100° C. to 150° C., a loss tangent peak value of 0.15 or more
Implementation Method 3
having a dry heat shrinkage of 5% or more and less than 15%
Data Source
AI summary
The present disclosure relates to a synthetic fiber, having a loss tangent peak temperature of 100° C. or higher and 150° C. or lower, a loss tangent peak value of 0.15 or more, and a dry heat shrinkage of 5% or more and less than 15%. The present disclosure also relates to a synthetic fiber, having a loss tangent area from 30° C. to 130° C. of 4.0° C. or more and 7.5° C. or less.