Bambu como matéria-prima para papel: V - Estudos sôbre o emprêgo de quatro espécies de Dendrocalamus,na produção de celulose sulfato Translated title: Bamboo as raw material for pulp and paper: V - Studies of dendeocalamus giganteus (wall) munro, D. asper (schult.) backer ex hayne, D. latiflokus munro and D. strictus (roxb) nees, in the production of pulp by the sulphate process

Abstract

Quatro espécies de bambu do gênero Dendrocalamus (D. giganteus, D. asper, D. latiflorus e D. strictus) foram testadas, em laboratório, para a produção de pasta para papel, através do processo sulfato. Previamente aos cozimentos, determinaram-se as dimensões e os pesos dos colmos, sua densidade básica e as dimensões das fibras. Os cozimentos, efetuados pelo processo sulfato, determinaram rendimento em pasta celulósica branqueável um pouco inferiores àqueles das principais espécies arbóreas usadas para a mesma finalidade. Dendrocalamus giganteus superou as demais espécies, tanto em rendimento como nas características físico-mecânicas do papel.

Translated abstract

Four bamboo species of Dendrocalamus (D. asper, D. latiflorus, D. giganteus and D. strictus), were studied to determine their feasibility for pulp and paper production by the sulphate process. Data was taken on culm characteristics, as well as basic density and fiber dimensions on sample basis. Five cookings involving the four species were carried out in electrically heated rotary autoclave of 20 litres capacity at 14% of active alkali as Na2O, 25% of sulfidity 1:4 ratio of material to liquor and maximum temperature of 160 ± 2°C during 60 minutes. Unbleached yield and permanganate number of pulps were determined. Handmade sheets with 60 g/s.m. were conditioned at 65% RH and 21ºC and their strenght properties tested. The results indicated that D. giganteus produced 39.10% of unbleached pulp yield and also superior quality for most of the paper strength properties considered on this research.