Alternativas tecnológicas para melhoria de propriedades mecânicas de papéis tissue e sua aplicação para diferentes polpas kraft de eucalipto

• Autor(a) principal: Ramires, Heloisa Ogushi Romeiro
• Data de Publicação: 2013
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/5941
• topic: Papel tissue; Propriedades mecânicas de papéis tissue; Eucalipto; Tissue paper; Mechanical properties of tissue papers; Eucalyptus; CNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL::TECNOLOGIA E UTILIZACAO DE PRODUTOS FLORESTAIS::TECNOLOGIA DE CELULOSE E PAPEL

The tissue paper industry is consolidating as a good alternative in consumption of eucalyptus pulp fibers. Referred to the high competitive level of pulp and paper industry, it is currently perceived an increase trend in the usage of eucalyptus pulp in tissue furnish, been demanded by the need to created better properties, but also in substitution of more expensive fibers like long fibers. In this context, a barrier for long fiber replacement is normally the resulted mechanical properties, which may impact the final product and runnability of paper machines. This master thesis aims to essay the potential of mechanical strength generation of different eucalyptus market pulps from Eucalyptus urophylla and Eucalyptus grandishybridsaccording to their chemical, physical and morphological characteristics. Also was studied their behavior under the most relevant technologies for strength properties increase such as refining and starch adsorption. In this study, the pulps with higher alkalinity and higher carboxylic acid content, related to its production technology process, showed superior mechanical properties such as tensile strength and elongation, but higher resistance to drainability. They also resulted in smaller fibrillation and relative bonded area (RBA). All samples developed better properties when submitted to the starch absorption with corn amphoteric starch, but under lower refining levels, the sample with higher carboxylic acids developed a higher tensile strength. Thus, it was possible to verify that current evaluated technologies, whether for differentiation in pulp process or for treating fibers in the paper process can increase significantly the mechanical properties of tissue paper.