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Three Dimensional Poymer Drawing Model of Melt Blowing Process Based on Numerical Simulations of the Air Jet Flow Field

Author: ZhangChong
Tutor: ChenTing
School: Donghua University
Course: Textile Engineering
Keywords: Meltblown Non-woven Polymer Stretching Numerical Simulation
CLC: TS174
Type: Master's thesis
Year: 2009
Downloads: 32
Quote: 0
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Abstract


In this paper, we consider the space on lateral movement of the polymer and the polymer density and constant pressure specific heat with temperature variations and non-Newtonian fluid constitutive equation, the establishment of the three-dimensional model based on the numerical simulation of jet stream meltblown polymer stretching numerical methods for solving the model and compared with experimental results, also studied the impact of process parameters on polymer stretching. The first chapter introduces the research status of polymer melt stretching mechanism and jet flow field in the jet flow field, and the meaning and content. The second chapter gives the basic equation of the jet flow field, numerical simulation of the the annular nozzle jet stream field, the distribution of air velocity and temperature of the gas in the jet flow field, and were compared with the measured results. The results showed that the air velocity and temperature of the gas distribution simulation results in good agreement with the measured results, thus confirming the correctness of the jet flow field numerical simulation results, and laid an important foundation for the establishment of meltblown polymer stretching three-dimensional model. The third chapter describes the process of establishing of meltblown polymer stretching three-dimensional model, the numerical simulation of the jet flow field into the modeling process, and consider the polymer density and constant pressure specific heat of the polymer temperature relationship and non-Newtonian fluid constitutive equations and other factors. Chapter IV describes the method and process of the numerical solution of the polymer stretching model, the calculation of the fiber diameter, polymer vibration frequency and amplitude. Results in good agreement with the measured results of the calculation of the fiber diameter, the confirmed correctness of polymer stretching model built. The comparison of the amplitude of the the literature given polymer stretching process high-speed photographs and polymer results verified, but also to some extent the polymer stretching model. Using the model to further study the influence of the airflow the initial velocity and the gas the initial temperature of the fiber diameter during stretching of the polymer, the polymer of vibration frequency and amplitude. The study found that the higher initial velocity airflow, the finer the fiber diameter, the greater the amplitude of the polymer, but the polymer vibration frequency is first increased and then decreased; gas initial temperature change of the fiber diameter and polymer vibration frequency has little effect. In summary, this paper established a meltblown polymer numerical simulation based on the jet flow field to stretch a three-dimensional model that experimental verification, and laid a solid foundation to carry out the meltblown nonwoven polymer stretch Mechanism.

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CLC: > Industrial Technology > Light industry,handicrafts > Textile industry,dyeing and finishing industry > Non-woven fabric > Non - woven fabric technology
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