Evaluation of chemical and pulp properties in three native fast-growing species from a secondary forest in South Kalimantan, Indonesia

摘要

The objective of this study is to clarify the chemical and pulp properties of three native fast-growing species, terap (Artocarpus elasticus Reinw. Ex Blume), medang (Neolitsea latifolia (Blume) S. Moore), and balik angin (Alphitonia excelsa (Fenzel) Reissek ex Benth) from the secondary forest in South Kalimantan, Indonesia, for their possibility as new raw materials in pulp and paper industry in Indonesia. Wood meals (42 to 82 mesh size) were prepared for determining the contents of chemical components. Wood sticks (1 × 1 × 20 mm) were prepared to determine pulp properties. The mean value of the amounts of organic solvent extracts, holocellulose, and total lignin were 2.5, 76.4, and 27.6% in terap, 2.9, 79.7, and 22.6% in medang, and 2.1, 79.5, and 20.5% in balik angin, respectively. Among three species, the lowest mean values of organic solvent extracts and total lignin were found in balik angin, the highest holocellulose content was found in medang. The average pulp yields in terap, medang, and balik angin were 44.2, 51.5, and 52.2%, respectively, being highest pulp yield in balik angin wood. A significant positive correlation (r = 0.522) between holocellulose content and pup yield, and a significant negative correlation (r = -0.636) between lignin content and pulp yield were obtained, suggesting that high holocellulose and low lignin contents in these wood lead to high kraft pulp yields. Based on chemical properties and pulp yield from these three species examined here, it is considered that medang and balik angin are promising raw materials for pulp production.