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Prediction of Fiber Die Coating Thickness

Published online by Cambridge University Press:  01 February 2011

An Yang ,
XiaoMing Tao  and
XiaoYin Chen
An Yang
Affiliation:
An.Yang@polyu.edu.hk, Hong Kong Polytechnic University, Institute of Textiles and Clothing, Kowloon, Hong Kong, Hong Kong, 0, Hong Kong, 852-27666494, 852-27731432
XiaoMing Tao
Affiliation:
tctaoxm@polyu.edu.hk, Hong Kong Polytechnic University, Institute of Textiles and Clothing, Hung Hom, Kowloon, Hong Kong, N/A, China, People's Republic of
XiaoYin Chen
Affiliation:
Xy.Cheng@inet.polyu.edu.hk, Hong Kong Polytechnic University, Institute of Textiles and Clothing, Hung Hom, Kowloon, Hong Kong, N/A, China, People's Republic of
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Abstract

Fiber coating is an effective way to impart smartness to a fiber. Die coating is a process that utilizes a die to control the thickness and concentricity of the coating layer. In the present work the die coating mechanism is studied numerically. A mathematical model for the fiber coating thickness has been developed. Compared with the previous work, the proposed model considers the effect of gravity force to get the general solution. The shear rate acting on the fiber surface is proportional to the fiber draw speed in an unpressurized applicator and can be minimized in a pressurized applicator through the applied external pressure. A serials of experiments using open-cup and pressurized applicators have been designed and conducted to measure simultaneously the coating speed and coating thickness in the coating process. It was found that the gravity may be an important driving force for the coating flow when the drawing velocity is small and the viscous force decreases, but may be relatively insignificant for high speed coating process. The calculated results were compared with the experimental data and a good agreement was obtained.

Keywords

coatingfiberliquid
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 920: Symposium S – Smart Nanotextiles , 2006 , 0920-S04-07
Copyright
Copyright © Materials Research Society 2006

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