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Rheology Design and Experimental Test of Roll-to-Roll Process for Electroactive Cellulose Film

  • Sean Jhin Yoon
  • Lindong Zhai
  • Hyun Chan Kim
  • Jung Woong Kim
  • Ruth M. Muthoka
  • Debora Kim
  • Jaehwan Kim
Regular Paper
  • 34 Downloads

Abstract

This paper reports a theoretical model to analyze the roll-to-roll process for electroactive cellulose film that consists of casting, curing and drying processes, and the experimental data that reflect the effect of viscosity and rheology on the thickness control of the film. Analytical solutions were obtained from Navier-Stokes equation for the coupled fluid dynamic model reflecting the phase change of the cellulose during the curing and drying processes. The effect of the roll-to-roll casting speed on the flow velocity and the thickness of electroactive cellulose film were analyzed. The model successfully evaluated the flow velocity and the thickness of the processed films. Experimental verification on the analysis was conducted and the measured thickness data showed an inverse proportional relationship to the casting speed. Hole defects was observed during the fabrication of electroactive cellulose films, and the increased viscosity inside the blade gap and the lack of a yield stress in the fluid were presumed as the reasons for the hole defects. To remove the hole defects, dual ultrasonic vibration system was introduced. The results are applicable for roll-to-roll processes for other film fabrications.

Keywords

Roll-to-Roll Film Electroactive polymer Rheology Blade casting 

Nomenclature

ρ

density of the cellulose solution

V

flow velocity of the cellulose solution

del operator in mathematics

p

pressure of the cellulose solution flow

µ

viscosity of the cellulose solution

f

body force

g

gravity

u, v, w

components of the cellulose flow velocity

gx, gy, gz

components of the gravity

h

vertical distance between the blade and the casting belt

uo

speed of the roll-to-roll casting belt

σ

surface tension of the cellulose solution

Q

flow rate of the cellulose solution

A

gap area between the blade and the casting belt

H

thickness of the cellulose flow after passing the blade

m

mass of the cellulose solution after the blade gap

ρs

density of the cellulose solution

Hc

thickness of the cellulose film after curing process

k

shrink ratio of the cellulose film after curing process

mc

mass of the cellulose film after curing process

ρsolvent

density of solvent

ρwater

density of water

m'

mass of EAPap per unit width and length

H'

thickness of EAPap

s

mass change percentage after drying process

ρf

density of EAPap

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Copyright information

© Korean Society for Precision Engineering and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.DPAMSTECH Co., Ltd.Gyeonggi-doRepublic of Korea
  2. 2.CRC for Nanocellulose Future Composites, Department of Mechanical EngineeringInha UniversityIncheonRepublic of Korea

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