Resultados preliminares sôbre o estudo do quenafe como matéria-prima para papel Preliminary results on the study of kenaf as a raw-material for the pulp and paper industry

• Main Authors: Dirceu Ciaramello, Anísio Azzini
• Format: Article
• Language: English
• Published: Instituto Agronômico de Campinas 1971-01-01
• Series: Bragantia
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051971000100003
• ISSN: 0006-8705; 1678-4499

Variedades de quenafe, plantadas em diferentes espaçamentos, foram estudadas em ensaio instalado em 1968 no Centro Experimental de Campinas, do Instituto Agronômico, visando à produção de matéria-prima para celulose e papel. Produções da ordem de 29,4 t/ha de massa verde renderam 6,7 t/ha de caules secos, que foram estudados, sob diversos processos de cozimento, na produção de pasta para papel. Os processos sulfato e sulfito neutro de sódio revelaram-se apropriados para a obtenção de pasta celulósica de quenafe, dando papéis com boas características físico-mecânicas.<br>The production of pulping raw material for the paper industry of four varieties of kenaf (Hibiscus cannabinus L.) sown at three spacings (30, 40 and 50 cm) was compared in a field trial made at the Experimental Center, Campinas, SP. The analysis of variance of obtained data showed no differences between production of varieties or/and spacings. As an average, the yield was 29.4 metric ton of green stems which corresponded to 6.7 ton of dried weight per hectare. Determinations of physical properties indicated that basic density of stems is only 0.13 g/cm³ and that bast fibers are identical to those of softwood. Wood fibers, however, are shorter and with a larger lumen. Coockings by the sodium sulfate and neutral sodium sulfite processes gave pulp of reasonable quality in bursting, folding and tensile strengths but weak in the tearing and with low porosity.