Date of Award

12-1997

Degree Name

Master of Science

Department

Chemical and Paper Engineering

Department

Paper Engineering, Chemical Engineering and Imaging

First Advisor

Dr. Brian Scheller

Second Advisor

Dr. Ellsworth H. Shriver

Third Advisor

Dr. David Peterson

Access Setting

Masters Thesis-Open Access

Abstract

Beverage carrier paperboard containing the polyamide wet-strength resin is one type of fiber that is presently landfilled. In this study, it was repulped at a 15% consistency and a pH of 10 at 150° F. in a z-bar mixer. Hydrogen peroxide (HP), ammonium perswulfate (AP), sodium persulfate (SP) and dimethyldioxirane (DMD) were used during repulping. The HP was added at 1.0%, 2.5% and 5.0%, based on O.D. weight of the fiber. The remaining chemicals were added at the same oxidation equivalent. During repulping, the pulp was screened using a Britt Jar to determine percent yield over time. Samples were taken every 15 minutes for 2.25 hours. The voltage and amperes were also recorded for each run. The remaining pulp was screened and refined at 0, 15,000, and 18,000 revolutions with a PFI mill. Handsheets were made and tested for tensile and tear. At 2.35% level, the DMD produced the highest percent yield of 92.13%, and the persulfates had a yield of 84.80%. HP provided the smallest yield of 78.63% at a level of 5.0%. At 120-135 minutes using a low level of HP, the chemical made no impact compared to the no chemical runs. The no chemical runs had the highest tensile values, followed by HP, AP, DMD and lastly, SP. The highest tear values were at 18,000 revolutions for the low level of AP.

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