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Numerical Study of Melt-Spinning Dynamic Parameters and Microstructure Development with Ongoing Crystallization.

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This study simulates fiber formation using a two-phase fluid dynamics model, analyzing crystallization and mechanical properties. It reveals how spinning conditions influence fiber crystallinity, guiding high-performance fiber production.

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crystallizationdynamicsmelt spinningstructuretwo-phase model

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Area of Science:

  • Materials Science
  • Polymer Engineering
  • Computational Fluid Dynamics

Background:

  • Understanding fiber formation is crucial for developing advanced materials.
  • Melt-spinning processes involve complex interplay of fluid dynamics and crystallization kinetics.
  • Previous models often simplified the multi-physics involved in fiber spinning.

Purpose of the Study:

  • To numerically simulate the melt-spinning process for nascent fibers.
  • To analyze changes in crystallization, mechanical, and tensile properties.
  • To investigate the influence of various spinning parameters on fiber characteristics.

Main Methods:

  • Utilized a fluid dynamics two-phase model within the POLYFLOW environment.
  • Integrated Nakamura crystallization kinetics with process parameters, stretch-induced crystallization, and viscoelasticity.
  • Incorporated filament cooling, gravity, inertia, and air resistance for comprehensive simulation.

Main Results:

  • Successfully predicted temperature, velocity, strain rate, birefringence, and stress distributions in nylon 6 BHS and CN9987 fibers.
  • Obtained fiber crystallinity variation patterns under different stretching rates.
  • Determined the influence rules of inlet flow rate, winding speed, and extrusion temperature on fiber crystallization.

Conclusions:

  • The developed model accurately captures the complex phenomena during melt spinning.
  • Insights into crystallization paths and mechanical property changes offer optimization strategies.
  • Provides guidance for the industrial preparation of high-performance fibers.