ManufactureofPaperboardin Small-Scale Industry from the Mixture of Wood-Logging Wastes and Paper-MillSludge

A trial bas been carried out on processing of wood-longging wastes into pulp and paperboard manufacture using the mixture of pulp from wood-longging wastes and paper-min sludge at two various proportions,i.e. 50:50% and 25:75%. The processing of pulp from those tuastes emplftyed semi-chemical soda process in semi-pilotscale, using the conditions, i.e. alkali concentrations at 14% and 16%, weight ratio of wastes to cooking liquor 1:5.5. & suits revealed that the pulpfrom 14% alkaliconcentration suited better as thes/11dgemixtureforpaperboard manufacture,based onpulp yield, alkali consumption, and Koppa number. Theyield and physical as well as strength properties of paper board from the mixture o fpulp from wood-loujng wastes (50%) and paper-mill sludge(50%) together with additiveswere higher than thosefrom the mixture with 25:75% proportion (with additives). Further, the physical/ strength properties of paperboard from the mixture with 50:50% proportion were higher than conseet1tive!J thoseproducedfrom small scalepaptr board factory using the mixture of waste paper (50%) and sludge (50%) without additives; and those from the mixture ofplantation forest's wood-logging wastes pulp and paper-mill sludge(with additives and at 50:50% proportion). This suggests the prospective use of pulp from natural production forest's wood-longging wastes as a substitute material mixed with sludge, in place of wastepaper mrrently used by small-scalepaper board industries.