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

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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.

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Abbreviations

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

g x, g y, g z :

components of the gravity

h :

vertical distance between the blade and the casting belt

u o :

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

H c :

thickness of the cellulose film after curing process

k :

shrink ratio of the cellulose film after curing process

m c :

mass of the cellulose film after curing process

ρ solvent :

density of solvent

ρ water :

density of water

m':

mass of EAPap per unit width and length

H':

thickness of EAPap

s :

mass change percentage after drying process

ρ f :

density of EAPap

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Authors and Affiliations

  1. DPAMSTECH Co., Ltd., 43-10, Goraedeul-gil, Uiwang-si, Gyeonggi-do, 16071, Republic of Korea

    Sean Jhin Yoon

  2. CRC for Nanocellulose Future Composites, Department of Mechanical Engineering, Inha University, 100, Inha-ro, Nam-gu, Incheon, 22212, Republic of Korea

    Lindong Zhai, Hyun Chan Kim, Jung Woong Kim, Ruth M. Muthoka, Debora Kim & Jaehwan Kim

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  1. Sean Jhin Yoon
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  2. Lindong Zhai
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  3. Hyun Chan Kim
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Correspondence to Jaehwan Kim.

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Yoon, S.J., Zhai, L., Kim, H.C. et al. Rheology Design and Experimental Test of Roll-to-Roll Process for Electroactive Cellulose Film. Int. J. Precis. Eng. Manuf. 19, 1377–1384 (2018). https://doi.org/10.1007/s12541-018-0162-4

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  • DOI: https://doi.org/10.1007/s12541-018-0162-4

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