Date of Award


Degree Name

Bachelor of Science


Pulp and Paper Technology


The purpose of this investigation was to study the effect that fiber length had on the tear strength. Of utmost importance to the results of this study was the elimination or controlling of variables which have appeared in all related studies to date. With this in mind, an experimental procedure was drawn up which would eliminate or control the variables. Long, whole fibers were isolated, formed into handsheets, and dried without having been pressed. The handsheets were then cut in order to reduce the fiber length. Cutting of the fibers was done with a paper cutter and was followed by average fiber length determination by projection. The cut fibers were then classified and the classification fractions were retained for making handsheets for testing.

It was found that the distribution of the fiber lengths was as important to the tear test results as was average fiber length as constant dependence on average fiber length alone could not be found. Only when considering both average fiber length and distribution of the fiber lengths could a sensible correlation be deduced for the effect of the tear test. Studies of how elongation and tensile absorption energy are effected by a difference in fiber lengths and a study of the effect of basis weight on elongation were made, and no correlation was found for any of the factors mentioned.