| Summary: | Kesan faktor-faktor pemulpaan kraft ke atas sifat-sifat pulpa dan kertas daripada
Acacia mangium telah dikaji dengan menggunakan kaedah respon pennukaan
berasaskan rekabentuk komposit berpusat. Alkali aktif (AA), sulfiditi (S), suhu
pemulpaan (T) dan masa pemulpaan (t) m~rupakan faktor-faktor pemulpaan yang
dikaji, dengan julat masing-masing di antara 15.5 - 20.5%, 20.0 - 30.0%, 165 - 175°C
dan 105 - 135 minit. Keputusan sifat-sifat pulpa yang terdiri daripada hasil keseluruhan,
hasil penskrinan dan nombor Kappa masing-masing didapati berada dalam julat 41.83 -
51.76%, 36.09 - 44.72% dan 11.3 - 47.6. Manakala sifat-sifat kertasnya seperti indeks
tensil, indeks pecahan dan indeks koyakan pula, masing-masing berjulat 27.48 - 49.09
N.m/g, 3.50 - 5.10 kPa.m2/g dan 0.92 - 1.92 mN.m2/g.
Response surface methodology based on the central composite design was
applied to determine the effect of kraft pulping factors on the properties of pulp and
paper made from Acacia mangium. The independent variables investigated, with their
respective range, were active alkali (AA), 15.5 - 20.5%, sulfidity (S), 20 - 30%, pulping
temperature (T), 165 - 175°C and pulping time (t), 105 - 135 minutes. The results
obtained for pulp properties as determined by total yield, screened yield and Kappa
number were 41.83 - 51.76%, 36.09 - 44.72% and 11.3 - 47.6 respectively, whilst the
paper properties as evaluated by tensile, burst and tear indices were 27.48 - 49.09
N.m/g, 3.5 - 5.1 kPa.m2/g and 0.92 - 1.92 mN.m2/g respectively.
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