Date of Award
Bachelor of Science
Paper Science and Engineering
The size press has been examined in the past for its application for coating or pre-coating. Bentonite has been found to be a rheology modifier and also has been found to form a film on paper. Bentonite has been found to improve holdout and printing properties as well. In this study, bentonite was applied in small quantities on a pilot machine size press and the paper thus produced was examined for any improvements in coating, physical, and optical properties. Testing showed that bentonite had the greatest effect on porosity and pick strength, in that porosity decreased with increasing bentonite and pick increased with small amounts of bentonite but then fell off with higher levels of bentonite. Generally, it was found that addition of bentonite could be beneficial to some properties at one level of addition while being beneficial to other properties at other levels of addition.
Romer, C. Ted, "A Study of Bentonite as an Additive for Starch Size Press Treatment" (1978). Paper Engineering Senior Theses. 394.