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vol.42 número5CONTROLE PREVENTIVO E CURATIVO DE Oidium eucalypti EM MUDAS CLONAIS DE Eucalyptus benthamiiCONCENTRAÇÃO MUNDIAL DA PRODUÇÃO DE MEDIUM DENSITY FIBERBOARD (MDF) (1995 - 2016) índice de autoresíndice de assuntospesquisa de artigos
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Revista Árvore

versão impressa ISSN 0100-6762versão On-line ISSN 1806-9088

Resumo

FERRAZ, Ana Paula Almeida  e  VENTORIM, Gustavo. A STUDY OF THE PHYSICO-MECHANICAL PROPERTIES IN SHORT BLEACHING SEQUENCES. Rev. Árvore [online]. 2018, vol.42, n.5, e420505.  Epub 14-Nov-2018. ISSN 1806-9088.  https://doi.org/10.1590/1806-90882018000500005.

The kraft pulp of Eucalyptus spp. is relatively easy to be bleached. Therefore, studies have been carried out to reduce the number of stages of bleaching in the plant and minimize process costs. The present work aimed to evaluate the use of two short bleaching sequences in the physico-mechanical properties of cellulosic pulp as well as to compare these values to the ones obtained by usual bleaching sequences. The four bleaching sequences were ECF (elemental chlorine free), D0(E+P)D1P, AHTD0(E+P)D1P, and AHTDP and AHTD (PO). For each bleaching sequence the brightness, brightness reversion and total cost of reagents were evaluated. Physical and mechanical analyses were performed according to the methodologies of the Technical Association of the Pulp and Paper Industry (TAPPI, 2002). The AHTD (PO) sequence showed higher brightness, less brightness reversion, lower total cost and better smoothness compared to the reference sequences. However, it had a lower tear index and a lower compression index. The AHTDP sequence did not reach target brightness, however, it presented brightness reversion and lower total cost than the reference sequences. The AHTDP sequences showed high compression and smoothness, but presented a low compression index.

Palavras-chave : Cellulose; Eucalyptus; Short sequences; Elemental chlorine free bleaching.

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