Sifat pulp sulfat lima jenis kayu kurang dikenal - berdiameter kecil

This report deals with the study results of manufacturing unbleached sulphate pulp from 5 less-known wood species having small-diameter trunks wood. Samples in the form of wood logs were collected from Jambi (Central Sumatra). The five wood species were mahang (Macaranga pruinosa Muell Arg), medang (Litsea sp.), bayur (Pterospermum diversifolium), balam (Palaquium gutta Bail), and merkubung (Macaranga gigantea Muell Arg). Pulp manufacture was performed using sulphate process. Cooking treatments are: active alkali of 15 percent (as Na20), sulfidity of 25 percent (as Na20), wood to liquor ratio of 1 :4, maximum temperature of 170 DC, cooking duration of 3.0 hours (i.e. 1.5 hours at maximum temperature). After the cooking, it was determined the pulp yield. The de lignification extent through the Kappa number. The result of sulphate pulp was made into handsheet to be tested on its strength and optical properties. The testing on pulp strength was evaluated at two degrees of freeness, i.e. 32 °SR and 40 °SR. Results of testing indicate that balam and medang species were fairly suitable for raw materials of pulp, based on the low consumption of wood materials in volumes, i.e. consecutively 5.47 m3 and 5.67 m3 to produce 1 ton of pulp. Further, sulphate pulp from medang showed the greatest de lignification extent (i.e. lowest Kappa number) and highest brightness. Therefore, medang species (as short-fibered wood) is likely the most desirable wood for pulp/paper. The weakness of low strength of the medang pulp may be improved by mixing the medang pulp with long fibered pulp.

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Deskripsi Fisik

Buletin Penelitian Hutan : No.642

Bahasa

Indonesia

ISBN/ISSN

1410-0649

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Perpustakaan R.I. Ardi Koesoema

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