Strength Properties of Mechanical and Chemical Pulp Blends

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Blending two pulps rarely gives a linear change in paper properties with the blend ratio. This is especially true with mechanical and chemical pulps. The object of this study was to investigate the interaction between a mechanical and a chemical pulp and indentify the mechanisms affecting the strength properties of paper.

It is suggested that several mechanisms are functioning simultaneously. Some of them have a positive effect, while others have a negative or neutral effect on the strength properties of the blend. A positive effect of adding kraft pulp is an increase in the number of long fibres and a consequent increase in average fibre length and in total fibre strength. The most important but less positive effects, however, are related to fibre bonding and the activity of fibres in loading. Z-tensile strength is rarely increased by the addition of kraft pulp. Bonded area per fibre and average bonding strength are not increased linearly with kraft pulp addition. The amount of mechanical fines in the blend is believed also to have an important role.
Original languageEnglish
Pages (from-to)424-431
JournalPaperi ja puu
Volume74
Issue number5
Publication statusPublished - 1992
MoE publication typeA1 Journal article-refereed

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chemical pulp
mechanical pulp
kraft pulp
tensile strength
pulp

Keywords

  • pulp blends
  • mechanical pulp
  • chemical pulp
  • reinforcing pulp
  • strength properties

Cite this

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title = "Strength Properties of Mechanical and Chemical Pulp Blends",
abstract = "Blending two pulps rarely gives a linear change in paper properties with the blend ratio. This is especially true with mechanical and chemical pulps. The object of this study was to investigate the interaction between a mechanical and a chemical pulp and indentify the mechanisms affecting the strength properties of paper. It is suggested that several mechanisms are functioning simultaneously. Some of them have a positive effect, while others have a negative or neutral effect on the strength properties of the blend. A positive effect of adding kraft pulp is an increase in the number of long fibres and a consequent increase in average fibre length and in total fibre strength. The most important but less positive effects, however, are related to fibre bonding and the activity of fibres in loading. Z-tensile strength is rarely increased by the addition of kraft pulp. Bonded area per fibre and average bonding strength are not increased linearly with kraft pulp addition. The amount of mechanical fines in the blend is believed also to have an important role.",
keywords = "pulp blends, mechanical pulp, chemical pulp, reinforcing pulp, strength properties",
author = "E Retulainen",
year = "1992",
language = "English",
volume = "74",
pages = "424--431",
journal = "Paperi ja puu",
issn = "0031-1243",
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}

Strength Properties of Mechanical and Chemical Pulp Blends. / Retulainen, E.

In: Paperi ja puu, Vol. 74, No. 5, 1992, p. 424-431.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Strength Properties of Mechanical and Chemical Pulp Blends

AU - Retulainen, E

PY - 1992

Y1 - 1992

N2 - Blending two pulps rarely gives a linear change in paper properties with the blend ratio. This is especially true with mechanical and chemical pulps. The object of this study was to investigate the interaction between a mechanical and a chemical pulp and indentify the mechanisms affecting the strength properties of paper. It is suggested that several mechanisms are functioning simultaneously. Some of them have a positive effect, while others have a negative or neutral effect on the strength properties of the blend. A positive effect of adding kraft pulp is an increase in the number of long fibres and a consequent increase in average fibre length and in total fibre strength. The most important but less positive effects, however, are related to fibre bonding and the activity of fibres in loading. Z-tensile strength is rarely increased by the addition of kraft pulp. Bonded area per fibre and average bonding strength are not increased linearly with kraft pulp addition. The amount of mechanical fines in the blend is believed also to have an important role.

AB - Blending two pulps rarely gives a linear change in paper properties with the blend ratio. This is especially true with mechanical and chemical pulps. The object of this study was to investigate the interaction between a mechanical and a chemical pulp and indentify the mechanisms affecting the strength properties of paper. It is suggested that several mechanisms are functioning simultaneously. Some of them have a positive effect, while others have a negative or neutral effect on the strength properties of the blend. A positive effect of adding kraft pulp is an increase in the number of long fibres and a consequent increase in average fibre length and in total fibre strength. The most important but less positive effects, however, are related to fibre bonding and the activity of fibres in loading. Z-tensile strength is rarely increased by the addition of kraft pulp. Bonded area per fibre and average bonding strength are not increased linearly with kraft pulp addition. The amount of mechanical fines in the blend is believed also to have an important role.

KW - pulp blends

KW - mechanical pulp

KW - chemical pulp

KW - reinforcing pulp

KW - strength properties

M3 - Article

VL - 74

SP - 424

EP - 431

JO - Paperi ja puu

JF - Paperi ja puu

SN - 0031-1243

IS - 5

ER -