| Stickies can adversely affect the papermaking process, quality of the product, and cost of the operation. The purpose of this research was to characterize sticky contaminants at a state-of-the-art corrugated container mini mill.;A model system was used to simulate the contaminant removal components of the recycling mill. A fiber and sticky mass balance was performed on four grades of corrugated containers including a typical linerboard composition. Sticky concentrations were determined using a low density film method. It was found that the model system was able to remove between 88% to 97% of the sticky material with minimal fiber loss. Experimental results also found considerable differences in the initial sticky concentration between each grade. Sticky concentration ranges have been determined for each grade of OCC.;A detailed chemical analysis was conducted on mill deposits from the bottom wire return roll, top ply stretch roll, and dryer can doctor blade. Summer and winter deposits and centricleaned rejects were also analyzed in this research. The results from fourier transformation infrared and proton nuclear magnetic resonance spectroscopy were characteristic of materials contained in coating binders, ink residues, wood resins, contact adhesives and hot melts. |
