Resumo

AGUILAR-RIVERA, N. Effect of Storing of Sugar Cane Bagasse on Physical Properties from Cellulose for Paper. Ing. invest. y tecnol. [online]. 2011, vol.12, n.2, pp.189-197. ISSN 2594-0732.

Sugarcane bagasse is now a major source of fibre for pulp and papermaking in Mexico, bagasse pulps are used for all grades of paper: writing, toilet tissue, towelling, glassine, and others. The storage and handling of fibres are critical factors in the resulting pulp yield and quality because bagasse is a fibrous residue that remains after crushing the stalks, and contains short fibres and is a seasonal raw material. The storage produced at harvest time becomes necessary when it is used for operations that are carried out continuously throughout the year, such as pulp and paper production. Nevertheless the sugar cane bagasse fibers suffer severe degradation while in storage due to the action of undesirable microorganisms. The causes for the deterioration as fermentation proceed and the methods of storing and handling the bagasse to minimize this degradation are discussed. The purpose of this paper is to analyze the impact of quality from bagasse stored for 12 months on mechanical pulp properties compared with those of corresponding bleached and unbleached pulp made from mills bagasse (fresh bagasse). Soda pulping from storaged bagasse gave the best results in yield, degree of delignification and brightness; but it was found that all of the pulp strength and drainage properties were increased to the fresh bagasse pulp (burst index 42%, folding endurance 610% and breaking length 53%, Freeness 10%, drainage time of pulp 4.2%, porosity 20% and refinement degree 17.6%) however, tear index was reduced 14.2%. The analysis showed the influence of storage method on the mechanical properties of bleached and unbleached bagasse pulp and the need for an improved wet bulk storage system to produce acceptable quality chemical bagasse pulps from conventional bleaching method (CEH sequence) and ECF y TCF pulps.

Palavras-chave : bagasse pulps; storage; mechanical properties; ECF bleaching; pulp evaluation.

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