Technical Bulletin No. 0814: Beneficial Use of Pulp and Paper Industry Residuals: Extrusion for the Manufacture of Building Panels
Pulp extrusion at ultra-high consistency (approximately equal to 30% solids) has been shown to be a viable process for converting used paper into solid sheets and profiles. It has been demonstrated previously that used paper pulps and “model” wastewater treatment residuals require the addition of a water-soluble polymer (WSP) to alter rheological properties such that a homogenous pulp paste can be formed and extruded. This report describes attempts to evaluate the viability of extruding three types of actual mill residuals: primary treatment residuals from deink mills; OCC rejects; and paper machine rejects.