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Paper Information

Journal:   IRANIAN JOURNAL OF WOOD AND PAPER SCIENCE RESEARCH   fall 2016 , Volume 31 , Number 3 (56) #a00486; Page(s) 510 To 521.

The effect of TCF bleaching before and after refining on the CMP pulp properties

Author(s):  GOLI M.*, Zabihzade Majid, MAHDAVI S., Sadaghifar h.
* Sari University of Agricultural Sciences and Natural Resources, Iran
The objective of this study was the determination of the best method of bleaching including refining and bleaching (RB) or bleaching and then refining (BR) on chemical mechanical pulp (CMP) for the production of newsprint. Wood raw material consisting of mixed forest species wood was chipped and air dried to to equilibirium moisture content. Wood composition for CMP pulping was 40% poplar, 30% maple, 7. 5% oak, 7. 5% alder, 7. 5% willow, and 7. 5% Persimmon. In order to remove heavy metal ions from pulp, the chelating was carried out with DTPA. TCF Bleaching was carried out by 3% H2O2 and 2. 5% NaOH based on dry weight of pulp with initial brightness of 44. 6% ISO. Pulp bleaching was done in two stages, before and after the refining by laboratory PFI mill beater. Finally, handsheets were made from the RB and BR treated pulps and the sheet properties were evaluated according to TAPPI test methods. The results showed that BR treatment increased tensile, burst, tear indices, brightness, scattering coefficient, and density, but reduced yellowing, opacity, and light absorption coefficient.
Keyword(s): Chemical-mechanical pulp,bleaching,refining,pulp properties
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