Date of Award

12-1993

Degree Name

Master of Science

Department

Chemical and Paper Engineering

Department

Paper Engineering, Chemical Engineering and Imaging

First Advisor

Dr. Raymond L. Janes

Second Advisor

Dr. David K. Peterson

Third Advisor

James E. Kline

Fourth Advisor

Dr. Brain Sheller

Access Setting

Masters Thesis-Open Access

Abstract

The objective of this study was to investigate the effects of several types of coating viscosity on coat weight development during the beveled blade coating process. In this study, the effects of several types of coating viscosity were experimentally investigated at the applicator roll, before and underneath the blade. Coating color viscosities were changed through two methods. The first method involved changing the temperature of coating color at constant carboxymethylcellulose (CMC) concentration, while the second method consisted of varying the CMC concentration in coating formula at constant coating temperature.

Coating viscosity had an influencing effect both on the amount of total mass flow rate and coat weight. For the low and mid-range viscosity values the methods of obtaining the viscosity did not have much effect on both coat weight and total mass flow rate. However, at relatively high viscosity values the relationship between coating viscosity and (1) total mass flow rate reaching the blade and (2) coat weight depended on the method used to obtain the viscosity. Thus, the viscosity term used in theoretical blade coating equations is not a single, simple value but depends on other liquid properties such as rheology and penetration behavior.

Experimental results showed that the hydrodynamic lifting force (Hy) which develops underneath the blade is the prodominant force in coat weight development.

The linear relationship between the impulse and pressure forces and total mass flow rate of coating was not affected by how viscosity of coatings was obtained.

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