The effects of TMP and filler stratifying on wet web runnability and end product quality of fine paper

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Abstract

Increase of filler content in paper improves quality of the final product and reduces raw material costs. However, this is often accompanied by deterioration of paper machine runnability. In this paper the effects of stratifying PCC (precipitated calcium carbonate) and TMP on fine paper quality and the mechanical properties of dry and wet paper were studied. In addition, a new method was introduced for evaluating the layer purity of pulp and filler stratifying by measuring the fibre length distribution in the thickness direction of the paper. The filler addition reduced the mechanical properties of paper more with chemical than mechanical pulps, with similar dry tensile indices. Stratifying filler onto paper surfaces gave higher dry tensile strength properties than samples with mixed structures, whereas only a small positive effect was detected for wet tensile and relaxation properties as a result of stratifying. Stratifying fillers only had a small negative effect on the internal bond strength. Stratifying or mixing TMP with a chemical pulp blend was shown to enable an increase in the filler content of 10% without significant changes in the residual tension (tension after 0.475 s of relaxation) or tensile index of wet samples. Based on layer purity analysis, stratifying TMP and filler was found to be successful in these trials.
Original languageEnglish
Pages (from-to)130-136
Number of pages7
JournalNordic Pulp and Paper Research Journal
Volume27
Issue number1
DOIs
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

Fingerprint

Thymidine Monophosphate
filling materials
product quality
Fillers
mechanical property
chemical pulp
Chemical pulp
tensile strength
calcium carbonate
purity
mechanical properties
mechanical pulp
Mechanical pulp
Mechanical properties
Calcium Carbonate
cost
Calcium carbonate
pulp
effect
product

Keywords

  • Stratifying
  • chemical pulp
  • TMP
  • PCC
  • wet strength
  • dry strength
  • runnability

Cite this

@article{22e75075f49d49e482e7085b8fc5e314,
title = "The effects of TMP and filler stratifying on wet web runnability and end product quality of fine paper",
abstract = "Increase of filler content in paper improves quality of the final product and reduces raw material costs. However, this is often accompanied by deterioration of paper machine runnability. In this paper the effects of stratifying PCC (precipitated calcium carbonate) and TMP on fine paper quality and the mechanical properties of dry and wet paper were studied. In addition, a new method was introduced for evaluating the layer purity of pulp and filler stratifying by measuring the fibre length distribution in the thickness direction of the paper. The filler addition reduced the mechanical properties of paper more with chemical than mechanical pulps, with similar dry tensile indices. Stratifying filler onto paper surfaces gave higher dry tensile strength properties than samples with mixed structures, whereas only a small positive effect was detected for wet tensile and relaxation properties as a result of stratifying. Stratifying fillers only had a small negative effect on the internal bond strength. Stratifying or mixing TMP with a chemical pulp blend was shown to enable an increase in the filler content of 10{\%} without significant changes in the residual tension (tension after 0.475 s of relaxation) or tensile index of wet samples. Based on layer purity analysis, stratifying TMP and filler was found to be successful in these trials.",
keywords = "Stratifying, chemical pulp, TMP, PCC, wet strength, dry strength, runnability",
author = "Antti Oksanen and Kristian Salminen and Jarmo Kouko and Elias Retulainen",
note = "Project code: 52Layerrun",
year = "2012",
doi = "10.3183/NPPRJ-2012-27-01-p130-136",
language = "English",
volume = "27",
pages = "130--136",
journal = "Nordic Pulp and Paper Research Journal",
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T1 - The effects of TMP and filler stratifying on wet web runnability and end product quality of fine paper

AU - Oksanen, Antti

AU - Salminen, Kristian

AU - Kouko, Jarmo

AU - Retulainen, Elias

N1 - Project code: 52Layerrun

PY - 2012

Y1 - 2012

N2 - Increase of filler content in paper improves quality of the final product and reduces raw material costs. However, this is often accompanied by deterioration of paper machine runnability. In this paper the effects of stratifying PCC (precipitated calcium carbonate) and TMP on fine paper quality and the mechanical properties of dry and wet paper were studied. In addition, a new method was introduced for evaluating the layer purity of pulp and filler stratifying by measuring the fibre length distribution in the thickness direction of the paper. The filler addition reduced the mechanical properties of paper more with chemical than mechanical pulps, with similar dry tensile indices. Stratifying filler onto paper surfaces gave higher dry tensile strength properties than samples with mixed structures, whereas only a small positive effect was detected for wet tensile and relaxation properties as a result of stratifying. Stratifying fillers only had a small negative effect on the internal bond strength. Stratifying or mixing TMP with a chemical pulp blend was shown to enable an increase in the filler content of 10% without significant changes in the residual tension (tension after 0.475 s of relaxation) or tensile index of wet samples. Based on layer purity analysis, stratifying TMP and filler was found to be successful in these trials.

AB - Increase of filler content in paper improves quality of the final product and reduces raw material costs. However, this is often accompanied by deterioration of paper machine runnability. In this paper the effects of stratifying PCC (precipitated calcium carbonate) and TMP on fine paper quality and the mechanical properties of dry and wet paper were studied. In addition, a new method was introduced for evaluating the layer purity of pulp and filler stratifying by measuring the fibre length distribution in the thickness direction of the paper. The filler addition reduced the mechanical properties of paper more with chemical than mechanical pulps, with similar dry tensile indices. Stratifying filler onto paper surfaces gave higher dry tensile strength properties than samples with mixed structures, whereas only a small positive effect was detected for wet tensile and relaxation properties as a result of stratifying. Stratifying fillers only had a small negative effect on the internal bond strength. Stratifying or mixing TMP with a chemical pulp blend was shown to enable an increase in the filler content of 10% without significant changes in the residual tension (tension after 0.475 s of relaxation) or tensile index of wet samples. Based on layer purity analysis, stratifying TMP and filler was found to be successful in these trials.

KW - Stratifying

KW - chemical pulp

KW - TMP

KW - PCC

KW - wet strength

KW - dry strength

KW - runnability

U2 - 10.3183/NPPRJ-2012-27-01-p130-136

DO - 10.3183/NPPRJ-2012-27-01-p130-136

M3 - Article

VL - 27

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JO - Nordic Pulp and Paper Research Journal

JF - Nordic Pulp and Paper Research Journal

SN - 0283-2631

IS - 1

ER -