Date of Award


Degree Name

Bachelor of Science


Pulp and Paper Technology


The purpose of this study was to investigate plybond strength development of secondary fiber by the addition of the marine polymer chitosan.

The chitosan was applied to refined, lightly refined and unrefined pulp suspensions. Two-ply handsheets were produced with addition levels of .5, 1, 2, 3, and 4 percent chitosan based on fiber weight.

Results indicate that addition of chitosan to two-ply handsheets significantly increased plybond strength from 30 to 120 percent depending on furnish and degree of refining. It was also determined that maximum strength values of selected tests occurred at approximately the two percent addition level of chitosan.

Chitosan shows considerable promise as a polymeric strength additive for paper of multiply formation and a possible refining substitute.