The effect of chemical additives on the strength, stiffness and elongation potential of paper

Anders Strand (Corresponding Author), Alexey Khakalo, Jarmo Kouko, Antti Oksanen, Annika Ketola, Kristian Salminen, Orlando Rojas, Elias Retulainen, Anna Sundberg

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

Abstract

The effects of wet-end additions of cationic starches and/or carboxymethyl cellulose (CMC) on paper properties was determined by papermaking trials. The aim of this study was to mitigate the distinctive decrease in strength and stiffness due to unrestrained drying by addition of wet-end additives, while maintaining the extraordinarily high stretch potential of papers after unrestrained drying. Addition of the different polysaccharides increased the tensile index and density of the paper. The largest incgtreases in tensile index and stiffness were seen when combining cationic starches with CMC. With certain combinations of cationic starch and CMC, it was possible to increase the tensile index and stiffness of the paper, while maintaining the high elongation at break after unrestrained drying. To complement the results from the papermaking trials, adsorption of cationic starches and CMC onto cellulose nanofibril model surfaces was studied by QCM-D and SPR techniques. The additives adsorbed onto cellulose surfaces as soft gels, containing a large amount of coupled water. Adsorption of soft and malleable polysaccharide layers in the fiber-fiber joints enhanced the paper properties significantly on a macroscopic level. The softest and most swollen polysaccharide layers resulted in the largest increases in tensile index and stiffness of paper.
Original languageEnglish
Pages (from-to)324-335
Number of pages12
JournalNordic Pulp and Paper Research Journal
Volume32
Issue number3
Publication statusPublished - 1 Jan 2017
MoE publication typeA1 Journal article-refereed

Fingerprint

Carboxymethylcellulose Sodium
carboxymethylcellulose
cellulose
stiffness
Elongation
Cellulose
Stiffness
starch
Polysaccharides
Starch
papermaking
Drying
polysaccharides
Papermaking
drying
polysaccharide
adsorption
nanofibers
Adsorption
Fibers

Keywords

  • Carboxymethyl cellulose (CMC)
  • Cationic starch
  • Extendable fiber network
  • Paper shrinkage
  • Stretch
  • Tensile index
  • Tensile stiffness
  • Unrestrained drying

Cite this

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title = "The effect of chemical additives on the strength, stiffness and elongation potential of paper",
abstract = "The effects of wet-end additions of cationic starches and/or carboxymethyl cellulose (CMC) on paper properties was determined by papermaking trials. The aim of this study was to mitigate the distinctive decrease in strength and stiffness due to unrestrained drying by addition of wet-end additives, while maintaining the extraordinarily high stretch potential of papers after unrestrained drying. Addition of the different polysaccharides increased the tensile index and density of the paper. The largest incgtreases in tensile index and stiffness were seen when combining cationic starches with CMC. With certain combinations of cationic starch and CMC, it was possible to increase the tensile index and stiffness of the paper, while maintaining the high elongation at break after unrestrained drying. To complement the results from the papermaking trials, adsorption of cationic starches and CMC onto cellulose nanofibril model surfaces was studied by QCM-D and SPR techniques. The additives adsorbed onto cellulose surfaces as soft gels, containing a large amount of coupled water. Adsorption of soft and malleable polysaccharide layers in the fiber-fiber joints enhanced the paper properties significantly on a macroscopic level. The softest and most swollen polysaccharide layers resulted in the largest increases in tensile index and stiffness of paper.",
keywords = "Carboxymethyl cellulose (CMC), Cationic starch, Extendable fiber network, Paper shrinkage, Stretch, Tensile index, Tensile stiffness, Unrestrained drying",
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The effect of chemical additives on the strength, stiffness and elongation potential of paper. / Strand, Anders (Corresponding Author); Khakalo, Alexey; Kouko, Jarmo; Oksanen, Antti; Ketola, Annika; Salminen, Kristian; Rojas, Orlando; Retulainen, Elias; Sundberg, Anna.

In: Nordic Pulp and Paper Research Journal, Vol. 32, No. 3, 01.01.2017, p. 324-335.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - The effect of chemical additives on the strength, stiffness and elongation potential of paper

AU - Strand, Anders

AU - Khakalo, Alexey

AU - Kouko, Jarmo

AU - Oksanen, Antti

AU - Ketola, Annika

AU - Salminen, Kristian

AU - Rojas, Orlando

AU - Retulainen, Elias

AU - Sundberg, Anna

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Y1 - 2017/1/1

N2 - The effects of wet-end additions of cationic starches and/or carboxymethyl cellulose (CMC) on paper properties was determined by papermaking trials. The aim of this study was to mitigate the distinctive decrease in strength and stiffness due to unrestrained drying by addition of wet-end additives, while maintaining the extraordinarily high stretch potential of papers after unrestrained drying. Addition of the different polysaccharides increased the tensile index and density of the paper. The largest incgtreases in tensile index and stiffness were seen when combining cationic starches with CMC. With certain combinations of cationic starch and CMC, it was possible to increase the tensile index and stiffness of the paper, while maintaining the high elongation at break after unrestrained drying. To complement the results from the papermaking trials, adsorption of cationic starches and CMC onto cellulose nanofibril model surfaces was studied by QCM-D and SPR techniques. The additives adsorbed onto cellulose surfaces as soft gels, containing a large amount of coupled water. Adsorption of soft and malleable polysaccharide layers in the fiber-fiber joints enhanced the paper properties significantly on a macroscopic level. The softest and most swollen polysaccharide layers resulted in the largest increases in tensile index and stiffness of paper.

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KW - Cationic starch

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KW - Tensile index

KW - Tensile stiffness

KW - Unrestrained drying

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