Manufacture of Paperboard in Small-ScaleIndustry from the Mixture ofPlantation Forest's Wood Logging Wastesand Paper-Mill Sludge

Small-scale paperboard industries that use the mixed ran-materialef paper-mill sludge and waste currenty encounter diffimlties obtaining the latter item. In other side, uoad wastes generatedfrom the logging of industrial plantation forest are potentially abundant and sofarnotyetutilize deffectivel y As the releuance, a trial has been carried out on paperboard111a111ifact11re 11si11g the mixture efpulp from industnal plantation forest'swood-logging waste and paper- mill sludgeat two uarious proportions,i.e. 25%:75% and 100%:0%. The processing of those wastes intopulp wascondutted in a semi-pilot scale cooking digester usingthe semi-cbemical soda pulping conditions, i.e. alkali (NaOH) concentration at 14% and 16%, ratio ef mastesto cooking liquor 1:5.5, maxinmm telyl peratureal 120 C kept far 3 boars under 1.2-1.5 atmosphericpressnres. The resulting pulpat 14% was judged more appropriate as the sludge mixture based out the yield, alkali consmnption and Kappa number. The paperboard-sheeftorm ingfrofll the mixture was carried out at a small-community-owned paperboard industry, incorporating the use ef additives, i.e. 5% clayfille1; 2% alum retmtion-agent,4% tapioca binder,2% rosin soap. Yield, plysical/ strength propertiesand water absorption ff paperboardfrovl the mixt11reef industrial plantation forest's wood• logging,wastepulp (25%)and paper-mi// sludge(75%) nereworse than thosefrom 100% logging wastepulp, but still better than thoseproducedly small-scale communty-industry that uses the mixture of wastepaper (50%) and sludge (50%), withouI additives; and co11/d mostly satiify the requiremenf for colllmercial paperboard. This suggests the prospective use ef pulp from piantation forest's nlood-logging tuastes as substitute material mixed with sludge (al 25%:75%proportion),in place ef the wastepaper thesmall-scaleindustry mrrently asesfar the sludge mixture.