Effect of ozone based TCF bleaching sequences on the optical and mechanical properties of secondary fibres of low mechanical pulp content

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Title

Effect of ozone based TCF bleaching sequences on the optical and mechanical properties of secondary fibres of low mechanical pulp content (EN)

Creator

Economou, AM (EN)

Type

journalArticle (EN)

Partial document
Publication in journal (EN)

Article
Scientific article (EN)

Issued

2014-03-01T01:49:52Z

2000 (EN)

Year

2000 (EN)

Description

The application of totally chlorine-free (TCF) bleaching reagents to a heterogeneous wastepaper mixture consisting of unbleached krait pulp, with similar to 12% mechanical pulp, (incoming Kappa number 63) was studied. The TCF bleaching sequence stages were: acid treatment, low consistency (LC) oxygen delignification, high consistency (HC) oxygen delignification and ozone bleaching, as well as in situ produced dimethyldioxirane and hydrogen peroxide bleaching. Ozone consumption was limited to less than 1.3% to achieve as high as possible brightness improvement without fibre damage. Results presented in this paper suggest that a selected TCF bleaching sequence applied to the LC oxygen pulped wastepaper furnish, without wash-deinking, can produce a colour stripped, high brightness pulp (82.7% ISO at an overall yield of 75%), and showing only moderate colour reversion and tear index decrease. (EN)

Scientific field

Materials Science, Paper & Wood (EN)

Engineering and Technology ▶ Materials Engineering
Paper and wood (EN)

Subject

ozone bleaching (EN)

CONSISTENCY (EN)

recycled fibres (EN)

TCF bleaching (EN)

DIMETHYLDIOXIRANE (EN)

KRAFT PULP (EN)

Journal

APPITA JOURNAL (EN)