RELACIONES ENTRE LAS CONDICIONES DE PROCESAMIENTO Y LAS PROPIEDADES DE PULPAS KRAFT DE EUCALYPTUS GRANDIS

AREA, M. C.; CARVALHO, M.G.; FERREIRA, P.J.; FELISSIA, F.E.; JORGE, C.S.; VILALBA, L.

Santiago de Chile, Chile

Congreso; Congreso Iberoamericano de Investigación en Celulosa y Papel, CIADICYP 2006; 2006

Red Ibero-Americana de Docencia e Investigación en Celulosa y Papel

We investigated the effect of different treatments on the properties of eucalyptus grandis kraft pulps. Among those were: 1) a mill pulp 2) a laboratory pulp made from mill chips 3) a laboratory pulp with a phosphonate quelating agent as additive in kraft pulping 4) a mill pulp with a counter-ion change (Ca base) 5) pulp 4 with a phosphorous washing 6) a mill pulp with another counter-ion change (Na base) 7) pulp 6 with a phosphorous washing 8) a laboratory pulp as control for a biotreated pulp 9) a laboratory pulp made from fungus treated chips (biotreated pulp). Fiber properties were related to chemical, physical and surface properties. Handsheets made from laboratory pulps showed better strength and optical properties than the corresponding from industrial source, requiring lower refining energy to achieve 30ºSR. Water absorption and porosity were lower whilst crystallinity was higher. The quelating agent produced an increase in crystallinity, yield and tear but decreased tensile strength. Handsheets made from mill pulp showed uneven surface characteristics and heterogeneity. Pulp mill washing and base change caused a decrease in strength properties and an increase in brightness, due to colloidal material loss at interfiber spaces. Air permeability, water absorption, specific fiber surface, and roughness, were all higher for Ca based pulps as compared to the corresponding Na based ones. Biological treatment caused a decrease in crystallinity and an increase in porosity and fiber specific surface.