Date of Award


Degree Name

Bachelor of Science


Paper Science and Engineering


The purpose of this thesis was to determine whether high solids concentrations may be applied to air knife coatings for boxboard. Considerations were the effects of high solids on coat weight controllability and final sheet properties.

The study was conducted on a pilot air knife coater using coatings at 56-62% solids and containing .2 to .6 parts per hundred CMC as water retention aid. Finished sheet properties evaluated included brightness, gloss, smoothness, IGT pick strength, K & N ink absorption and glueability.

It was determined that solids levels up to 58% could be efficiently run providing machine speed did not exceed 500 fpm. While high solids showed no significant effect on brightness, gloss or smoothness; pick strength, ink absorption and glueability all decreased.