The effect of wood alignment on wood grinding

Part 1: Properties of pulp and fines revealed in the grinding mechanism

Erkki Saharinen (Corresponding Author), Airi Särkilahti, Lauri I. Salminen, Sabine Heinemann

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

In industrial wood grinding, logs are pressed against a rotating stone, with the logs and fiber axis parallel to the axis of the stone. The objective of this study is to clarify how the wood alignment affects the process and pulp properties. In this research, wood blocks were fed into a laboratory grinder with various alignments in relation to the surface of the grinding stone. The effects of the alignment on the properties of the pulp and the amount and quality of fines were measured. A grinding mechanism was proposed. The results show that the pulp quality is very sensitive to the angle between the stone surface and the log. In gentle refining, the fiber structure is loosened by fatigue before it is bent on the surface; pressure pulses produce fibrillar material, and fibers develop toward having good bonding ability. In forced grinding, the process is “violent”, and the fiber wears and becomes crushed immediately on the surface into small particles with low bonding ability.
Original languageEnglish
Pages (from-to)4201-4211
JournalBioResources
Volume11
Issue number2
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

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grinding
Pulp
Wood
Fibers
Grinding mills
fatigue
Refining
Wear of materials
Fatigue of materials
pulp
fibre
effect
stone
alignment

Keywords

  • groundwood
  • grinding angle
  • wood alignment
  • fiber properties
  • Norway spruce

Cite this

Saharinen, Erkki ; Särkilahti, Airi ; Salminen, Lauri I. ; Heinemann, Sabine. / The effect of wood alignment on wood grinding : Part 1: Properties of pulp and fines revealed in the grinding mechanism. In: BioResources. 2016 ; Vol. 11, No. 2. pp. 4201-4211.
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abstract = "In industrial wood grinding, logs are pressed against a rotating stone, with the logs and fiber axis parallel to the axis of the stone. The objective of this study is to clarify how the wood alignment affects the process and pulp properties. In this research, wood blocks were fed into a laboratory grinder with various alignments in relation to the surface of the grinding stone. The effects of the alignment on the properties of the pulp and the amount and quality of fines were measured. A grinding mechanism was proposed. The results show that the pulp quality is very sensitive to the angle between the stone surface and the log. In gentle refining, the fiber structure is loosened by fatigue before it is bent on the surface; pressure pulses produce fibrillar material, and fibers develop toward having good bonding ability. In forced grinding, the process is “violent”, and the fiber wears and becomes crushed immediately on the surface into small particles with low bonding ability.",
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The effect of wood alignment on wood grinding : Part 1: Properties of pulp and fines revealed in the grinding mechanism. / Saharinen, Erkki (Corresponding Author); Särkilahti, Airi; Salminen, Lauri I.; Heinemann, Sabine.

In: BioResources, Vol. 11, No. 2, 2016, p. 4201-4211.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - The effect of wood alignment on wood grinding

T2 - Part 1: Properties of pulp and fines revealed in the grinding mechanism

AU - Saharinen, Erkki

AU - Särkilahti, Airi

AU - Salminen, Lauri I.

AU - Heinemann, Sabine

PY - 2016

Y1 - 2016

N2 - In industrial wood grinding, logs are pressed against a rotating stone, with the logs and fiber axis parallel to the axis of the stone. The objective of this study is to clarify how the wood alignment affects the process and pulp properties. In this research, wood blocks were fed into a laboratory grinder with various alignments in relation to the surface of the grinding stone. The effects of the alignment on the properties of the pulp and the amount and quality of fines were measured. A grinding mechanism was proposed. The results show that the pulp quality is very sensitive to the angle between the stone surface and the log. In gentle refining, the fiber structure is loosened by fatigue before it is bent on the surface; pressure pulses produce fibrillar material, and fibers develop toward having good bonding ability. In forced grinding, the process is “violent”, and the fiber wears and becomes crushed immediately on the surface into small particles with low bonding ability.

AB - In industrial wood grinding, logs are pressed against a rotating stone, with the logs and fiber axis parallel to the axis of the stone. The objective of this study is to clarify how the wood alignment affects the process and pulp properties. In this research, wood blocks were fed into a laboratory grinder with various alignments in relation to the surface of the grinding stone. The effects of the alignment on the properties of the pulp and the amount and quality of fines were measured. A grinding mechanism was proposed. The results show that the pulp quality is very sensitive to the angle between the stone surface and the log. In gentle refining, the fiber structure is loosened by fatigue before it is bent on the surface; pressure pulses produce fibrillar material, and fibers develop toward having good bonding ability. In forced grinding, the process is “violent”, and the fiber wears and becomes crushed immediately on the surface into small particles with low bonding ability.

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KW - grinding angle

KW - wood alignment

KW - fiber properties

KW - Norway spruce

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JO - BioResources

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SN - 1930-2126

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