Date of Award

12-1980

Degree Name

Bachelor of Science

Department

Paper Science and Engineering

Abstract

The objective of this study was to study the curl response of paper as affected by filler distribution, i.e. top-side, wire-side, or middle of the sheet, and to determine whether or not filler distribution plays a part in curl formation. Plybonded sheets were prepared which contained 17-20% ash. The filler content was positioned in various locations within the sheet. The sheets were subjected to relative humidities of 20-80%, and the curl response was measured. The maximum curl was produced when the filler was farthest away from the dryer surface. Minimum curl. was produced when the filler was closest to the dryer surface. Sheets which contained an even distribution of filler gave a proximately the same results as the unfilled sheets. The location of filler within a sheet of paper varied the magnitude and direction of curl. The curl responses of filled and unfilled sheets were not significantly different provided that the filler content was evenly distributed.

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