Zhuang Wu

Date of Award


Degree Name

Master of Science


Chemical and Paper Engineering


Paper Engineering, Chemical Engineering and Imaging

First Advisor

Dr. Raja Aravamuthan

Second Advisor

Dr. David Peterson

Third Advisor

Dr. Ellsworth Shriver

Access Setting

Masters Thesis-Open Access


The effects of recycling paper that has undergone aging for different periods on paper and fiber properties like strength, weighted average fiber length, and water retention value were investigated in this study. Old Newspapers (ONP) with different periods of natural aging (between 1 to 10 months) were recycled repeatedly for up to six times. Another goal was the study of aging effects on paper properties using accelerated aging at high temperatures (105±2) °C. Four different aging times (24, 48, 72, and 144 hours) were employed.

The results showed that naturally aged ONP loses little in strength properties up to 7 months; later, there is a significant decrease. The accelerated aging tests showed strength loses for all aging periods. The water retention value decreases with increasing aging time and number of repeated recycling. The age of the recycled paper is found to be a more important variable than the number of times that the paper has been recycled. It is also found that 10 months of natural aging is equivalent to less than 24 hours of accelerated aging under the experimental conditions.