Repulping Wet Strength Paper, 1996 Papermakers Conference Proceedings
A new repulping process that uses a non-chlorinated oxidizing agent and a rewetting agent was found very effective in repulping difficult to break down wet strength paper. The process is particularly useful in repulping unbleached paper and old corrugated containers (OCC) containing polyaminoamide-epichlorohydrin (PAE) wet strength resins. The process involves oxidizing the wet strength paper at a low pH with inorganic or organic peroxides followed by hydrolyzing the wet strength paper at a high PH. In field trials, unbleached paper containing high levels of PAE resin were repulped to about 95% in mill hydropulpers. This process enables papermakers to defiber unbleached paper and OCC more efficiently than commonly practiced neutral or alkaline repulping processes.
Repulping Wet Strength Paper, 1996 Papermakers Conference Proceedings