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

초록

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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