Utilização de madeiras de espécies nativas e exóticas da Amazônia visando a produção de celulose Kraft

Abstract

The thecnological characteristics and kraft pulps of five species of Amazonian Moraceae, Brasimum parinarioides Duche (amapá), Pourouma longipendulaDuch (embaurarana), Clarisia racemosa R. & P. (guariúba), Helicostylis tomentosa Rusby (inharé), Brasimum rubescensTaub. (muirapiranga) and of the exotic species Anthocephalus chinensis(Lamk.) Rich, , Eucalyptus deglupta Blume e Gmelina arboreaRoxb. were studied. The dendrometric characteristc. chemistry, and basic densities oh the woods were determined. Delignification was most difficult in the species inharé and muirapiranga. Wood pulps were bleanched in the sequence CEDED, CEHDED and C/DEDED. Pulps with higher lignin residue contents consumed more reagens during bleaching. The beste values for self breakage length, stretching, and burst were obtained with the ubleached pulps of the exotic species. The greates tear resistance was encountered in the species amapá, guariúba and inharé.