Peroxide bleaching of thermo-mechanical pulp from stored spruce wood

Jari Sirviö, Airi Särkilahti, Tiina Liitiä, Antti Fredrikson, Ilkka Nurminen

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

Although excessive storage of wood is disadvantageous, in some cases it cannot be avoided. This research has investigated the effects of wood storage on thermo-mechanical pulp (TMP) properties and how to overcome the expected disadvantages in brightness by bleaching. Norway spruce logs were stored outside in piles over the summer and compared to fresh wood as a raw material for TMP production. During the summer, the stored wood lost moisture and brightness. After storage, the optical properties did not hold up as well as the process runnability and pulp strength properties. The amount of colored substances in the wood increased both during storage and further in refining, resulting in reduced pulp brightness. This brightness loss can still be recovered by peroxide bleaching, although 8-10 kg/BDt higher peroxide charges are needed to reach, for example, a target brightness of 75%.
Original languageEnglish
Pages (from-to)26-31
Number of pages5
JournalJ-FOR: Journal of Science & Technology for Forest Products and Processes
Volume2
Issue number5
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

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Thermomechanical pulp
Peroxides
Bleaching
Luminance
Wood
Pulp
Refining
Piles
Raw materials
Moisture
Optical properties

Cite this

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title = "Peroxide bleaching of thermo-mechanical pulp from stored spruce wood",
abstract = "Although excessive storage of wood is disadvantageous, in some cases it cannot be avoided. This research has investigated the effects of wood storage on thermo-mechanical pulp (TMP) properties and how to overcome the expected disadvantages in brightness by bleaching. Norway spruce logs were stored outside in piles over the summer and compared to fresh wood as a raw material for TMP production. During the summer, the stored wood lost moisture and brightness. After storage, the optical properties did not hold up as well as the process runnability and pulp strength properties. The amount of colored substances in the wood increased both during storage and further in refining, resulting in reduced pulp brightness. This brightness loss can still be recovered by peroxide bleaching, although 8-10 kg/BDt higher peroxide charges are needed to reach, for example, a target brightness of 75{\%}.",
author = "Jari Sirvi{\"o} and Airi S{\"a}rkilahti and Tiina Liiti{\"a} and Antti Fredrikson and Ilkka Nurminen",
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Peroxide bleaching of thermo-mechanical pulp from stored spruce wood. / Sirviö, Jari; Särkilahti, Airi; Liitiä, Tiina; Fredrikson, Antti; Nurminen, Ilkka.

In: J-FOR: Journal of Science & Technology for Forest Products and Processes, Vol. 2, No. 5, 2012, p. 26-31.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Peroxide bleaching of thermo-mechanical pulp from stored spruce wood

AU - Sirviö, Jari

AU - Särkilahti, Airi

AU - Liitiä, Tiina

AU - Fredrikson, Antti

AU - Nurminen, Ilkka

N1 - Project code: 38393-1.2.

PY - 2012

Y1 - 2012

N2 - Although excessive storage of wood is disadvantageous, in some cases it cannot be avoided. This research has investigated the effects of wood storage on thermo-mechanical pulp (TMP) properties and how to overcome the expected disadvantages in brightness by bleaching. Norway spruce logs were stored outside in piles over the summer and compared to fresh wood as a raw material for TMP production. During the summer, the stored wood lost moisture and brightness. After storage, the optical properties did not hold up as well as the process runnability and pulp strength properties. The amount of colored substances in the wood increased both during storage and further in refining, resulting in reduced pulp brightness. This brightness loss can still be recovered by peroxide bleaching, although 8-10 kg/BDt higher peroxide charges are needed to reach, for example, a target brightness of 75%.

AB - Although excessive storage of wood is disadvantageous, in some cases it cannot be avoided. This research has investigated the effects of wood storage on thermo-mechanical pulp (TMP) properties and how to overcome the expected disadvantages in brightness by bleaching. Norway spruce logs were stored outside in piles over the summer and compared to fresh wood as a raw material for TMP production. During the summer, the stored wood lost moisture and brightness. After storage, the optical properties did not hold up as well as the process runnability and pulp strength properties. The amount of colored substances in the wood increased both during storage and further in refining, resulting in reduced pulp brightness. This brightness loss can still be recovered by peroxide bleaching, although 8-10 kg/BDt higher peroxide charges are needed to reach, for example, a target brightness of 75%.

M3 - Article

VL - 2

SP - 26

EP - 31

JO - J-FOR: Journal of Science & Technology for Forest Products and Processes

JF - J-FOR: Journal of Science & Technology for Forest Products and Processes

SN - 1927-6311

IS - 5

ER -