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  • 1. Gustafsson, Cristina
    Minskning i variation av kontrollvariabler genom utvärdering av skillnader i pappers- och massa egenskaper för två arter av tall2012Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The objective of this thesis work was to investigate if there is a difference regarding pulping and paper properties of two pine species (Pinus tecunumanii and Pinus patula) investigated at two different Kappa numbers. This was carried out by first producing a pulping curve relating Kappa number to the amount of charged chemicals. This curve was then used to calculate the necessary amount of chemicals to reach the desired Kappa numbers in the labscale digesters. The pulping properties were analysed by measuring pH, residual alkali and solids percentage of the black liquor and the Kappa number and yield of the pulp. The pulps were then refined and formed into handsheets which were evaluated regarding bulk, burst -, tear- and tensile strength, TEA (tensile energy absorption), elongation and porosity.The results indicate that P. tecunumanii, compared to P. patula, demands longer time in the digester or a higher charge of chemicals to obtain the same Kappa number. The results also indicate that the pulp yield is higher for P. patula. Regarding the paper properties no significant difference could be seen at the lower Kappa number but at the higher Kappa number the species Pinus tecunumanii show higher strength.

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