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

Goli, Mohtaba; Zabihzadeh, Majid; Mahdavi, Saeed; Sadeghifar, Hassan

doi:10.22092/ijwpr.2016.106282

	The effect of TCF bleaching before and after refining on the CMP pulp properties
تحقیقات علوم چوب و کاغذ ایران
Article 12, Volume 31, Fall 3 - Serial Number 56, September 2016, Pages 510-521 PDF (319.43 K)
Document Type: Research Paper
DOI: 10.22092/ijwpr.2016.106282
Authors
Mohtaba Goli^* ¹; Majid Zabihzadeh²; Saeed Mahdavi³; Hassan Sadeghifar⁴
¹M.Sc., graduate in pulp and Paper industry, Sari University of Agricultural Sciences and Natural Resources, Iran
²Associate professor in wood and Paper industry, Sari University of Agricultural Sciences and Natural Resources, sari, Iran
³Associate professor, Wood and Forests Products Division, Research Institute of Forests and Rangelands, Karaj, Iran
⁴Assistant professor, North state university of Carolina, Postdoctoral student, USA
Abstract
The objective of this study was 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 consists of mixed wood forest species was chipped and air dried to calculate the moisture content. Wood composition percentages 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 of pulp, the chelating was carried out with DTPA. TCF Bleaching 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. The results confirmed the conventional method of CMP pulp treatment (BR) in MWPI.
Keywords
Chemical-mechanical pulp; bleaching; Refining; pulp properties

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

- Blomstedt, M., 2007. modification of cellulosic fibers by carboxymethyl cellulose (CMC), effects on fiber and sheet properties, Doctoral Dissertation, Helsinki University of Technology, Laboratory of Forest Products Chemistry, 90 pages.

- Zeinaly, F., Shakhes, J., Dehghani Firozabadi, M., Shakeri, A., 2009a. Hydrogen peroxide bleaching of CMP pulp using magnesium hydroxide, BioResources, 4(4):1409-1416.