Fracture Properties in Filled Papers

Atsushi Tanaka, Eero Hiltunen, Heikki Kettunen, Kaarlo Niskanen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

The mechanical properties of paper are impaired by the addition of filler. The beating of kraft pulp and addition of starch are possible remedies for this. However, beating also has negative effects because it reduces opacity and bulk, and starch effects are limited by retention. Optimal use of the kraft pulp and starch is therefore important. We show that in pure kraft sheets beating alone can compensate for most of the adverse effects on mechanical properties caused by kaolin addition. In TMP-based sheets with kaolin, the mechanical properties are fairly insensitive to the kraft content unless very high beating levels are used. The primary role of kraft is to improve tensile stiffness, not tensile strength of paper. Starch and beating both improve inter-fiber bonding but beating also raises fiber segment activation. The latter mechanism contributes to tensile stiffness but reduces damage width. The other mechanical properties of paper appear to be insensitive to fiber segment activation.
Original languageEnglish
Title of host publicationThe Science of Papermaking
EditorsC. F. Baker
Pages1403-1421
Number of pages19
ISBN (Electronic)0-9541126-0-1
Publication statusPublished - 2001
MoE publication typeNot Eligible
Event12th Fundamental Research Symposium, Oxford: The Science of Papermaking - University of Oxford, Oxford, United Kingdom
Duration: 16 Sep 200121 Sep 2001

Conference

Conference12th Fundamental Research Symposium, Oxford
CountryUnited Kingdom
CityOxford
Period16/09/0121/09/01

Fingerprint

mechanical properties
starch
kraft pulp
kaolin
filling materials
opacity
tensile strength
adverse effects

Cite this

Tanaka, A., Hiltunen, E., Kettunen, H., & Niskanen, K. (2001). Fracture Properties in Filled Papers. In C. F. Baker (Ed.), The Science of Papermaking (pp. 1403-1421)
Tanaka, Atsushi ; Hiltunen, Eero ; Kettunen, Heikki ; Niskanen, Kaarlo . / Fracture Properties in Filled Papers. The Science of Papermaking. editor / C. F. Baker. 2001. pp. 1403-1421
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Tanaka, A, Hiltunen, E, Kettunen, H & Niskanen, K 2001, Fracture Properties in Filled Papers. in CF Baker (ed.), The Science of Papermaking. pp. 1403-1421, 12th Fundamental Research Symposium, Oxford, Oxford, United Kingdom, 16/09/01.

Fracture Properties in Filled Papers. / Tanaka, Atsushi; Hiltunen, Eero; Kettunen, Heikki; Niskanen, Kaarlo .

The Science of Papermaking. ed. / C. F. Baker. 2001. p. 1403-1421.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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T1 - Fracture Properties in Filled Papers

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AU - Hiltunen, Eero

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N2 - The mechanical properties of paper are impaired by the addition of filler. The beating of kraft pulp and addition of starch are possible remedies for this. However, beating also has negative effects because it reduces opacity and bulk, and starch effects are limited by retention. Optimal use of the kraft pulp and starch is therefore important. We show that in pure kraft sheets beating alone can compensate for most of the adverse effects on mechanical properties caused by kaolin addition. In TMP-based sheets with kaolin, the mechanical properties are fairly insensitive to the kraft content unless very high beating levels are used. The primary role of kraft is to improve tensile stiffness, not tensile strength of paper. Starch and beating both improve inter-fiber bonding but beating also raises fiber segment activation. The latter mechanism contributes to tensile stiffness but reduces damage width. The other mechanical properties of paper appear to be insensitive to fiber segment activation.

AB - The mechanical properties of paper are impaired by the addition of filler. The beating of kraft pulp and addition of starch are possible remedies for this. However, beating also has negative effects because it reduces opacity and bulk, and starch effects are limited by retention. Optimal use of the kraft pulp and starch is therefore important. We show that in pure kraft sheets beating alone can compensate for most of the adverse effects on mechanical properties caused by kaolin addition. In TMP-based sheets with kaolin, the mechanical properties are fairly insensitive to the kraft content unless very high beating levels are used. The primary role of kraft is to improve tensile stiffness, not tensile strength of paper. Starch and beating both improve inter-fiber bonding but beating also raises fiber segment activation. The latter mechanism contributes to tensile stiffness but reduces damage width. The other mechanical properties of paper appear to be insensitive to fiber segment activation.

M3 - Conference article in proceedings

SN - 0-9541126-0-1

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BT - The Science of Papermaking

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Tanaka A, Hiltunen E, Kettunen H, Niskanen K. Fracture Properties in Filled Papers. In Baker CF, editor, The Science of Papermaking. 2001. p. 1403-1421