Changes in the Handsheet Properties by Low Concentration Sodium Hydroxide Swelling and Beating

Kyoung-Hwa Choi; Ah-Ram Kim; Byoung-Uk Cho

doi:10.7584/ktappi.2014.46.4.069

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Changes in the Handsheet Properties by Low Concentration Sodium Hydroxide Swelling and Beating 저농도 NaOH 팽윤과 고해에 따른 수초지 특성 변화

30 August 2014. pp. 69-75

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Abstract

Effects of alkali swelling of HwBKP (hardwood bleached kraft pulp) at a low concentration below 2 percent (based on the oven-dried weight of pulp) on handsheet properties were investigated. Swelling treatment of HwBKP was performed at various low NaOH concentrations with/without beating. Then, the changes in handsheet properties were evaluated in terms of bulk, optical and strength properties. It was found that bulk was slightly increased when the alkali concentration was increased. When the pulp was only swollen without beating, paper optical and strength properties was slightly decreased or not changed with alkali concentration. When the pulp was alkali-swollen after beating, paper strength and opacity showed almost no changes while brightness was increased. When the pulp was beaten after NaOH swelling, alkali concentration showed almost no effect on brightness and opacity of paper. Paper strength was slightly decreased with alkali concentration, suggesting that alkali pretreatment before refining could adversely affect refining efficiency.

Keywords

Alkali swelling

sodium hydroxide

beating, bulk

paper strength

optical properties

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Information

Publisher :Korea Technical Association of The Pulp and Paper Industry
Publisher(Ko) :한국펄프종이공학회
Journal Title :Journal of Korea TAPPI
Journal Title(Ko) :펄프종이기술
Volume : 46
No :4
Pages :69-75
Received Date : 2014-08-15
Revised Date : 2014-08-21
Accepted Date : 2014-08-22
DOI :https://doi.org/10.7584/ktappi.2014.46.4.069

Journal of Korea TAPPI ISSN:0253-3200(Print) 펄프종이기술

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