Date of Award
Bachelor of Science
Paper Science and Engineering
In an effort to integrate some of the diverse approaches to pulp swelling evaluation, this study incorporated various test to reveal the possible swelling changes occurring in a fiber. The scope of this report is to study the effects of pH and time of soaking in water on secondary fiber swelling and surface area.
For each trial, fibers were soaked for different times ranging between 0 and 25 hours. The trials consisted of three different samples which has pH's of 7.2, 9.2 and 11.5. This study involved three tests to help analyze any changes in the fiber. They are the freeness test (affinity of pulp towards water) and the Pulmac Permeability Tester (surface area).
The results acquired revealed the following conclusions; 1) By increasing the pH of a wood fibers slurry, the overall fiber surface area will tend to increase accordingly. 2) Around ten hours of soaking is required to obtain a maximum in fiber surface area and WRV, and a minimum in freeness value.
Norey, Daniel R., "The Effects of pH and Time on Fiber Surface Area" (1991). Paper Engineering Senior Theses. 449.