The effect of sequential polymer addition on wet- and dry-web mechanical characteristics: Laboratory, semi-pilot, and pilot studies

J. Kataja-aho*, K. Salminen, T. Rantanen, E. Retulainen, H. Lindqvist, A. Sundberg

*Corresponding author for this work

Research output: Chapter in Book/Conference proceedingConference contributionScientificpeer-review

Abstract

Fibre properties can be modified by treatment of the fibre surface with oppositely charged polyelectrolytes. Sequential addition of oppositely charged polyelectrolytes forms macromolecular layered structure of polyelectrolytes. The use of polyelectrolyte multilayers increases dry-paper strength with only minor changes in density, in light-scattering, or in the formation of the sheet. However, there is little information on multilayers' effects on wet-web mechanical properties, especially on dynamic tensile and relaxation behaviour. Tests on laboratory scale showed that the sequential addition of polymers can significantly improve the strength of the wet and dry paper web. Wet-paper tensile strength was improved 45% when cationic starch was added to pulp (1%) and A-PAM by spraying (0.3 g/m2) onto wet handsheets. Furthermore, semi-pilot and pilot trials confirmed the laboratory findings, and similar effects on wet-paper tensile strength were observed. Overall, modifying the interactions between fibres in wet state seems to be very beneficial for wet web runnability. However, the generation of polymer multilayers or even a bi-layer on the paper machine by spraying may be challenging, although its huge benefits seem to make it an interesting option.

Original languageEnglish
Title of host publicationPaper Conference and Trade Show 2012, PaperCon 2012
Subtitle of host publicationGrowing the Future - Co-located with Control Systems 2012
Pages180-186
Number of pages7
Publication statusPublished - 2012
MoE publication typeA4 Article in a conference publication
EventPaper Conference and Trade Show 2012: Growing the Future, PaperCon 2012 - Co-located with Control Systems 2012 - New Orleans, LA, United States
Duration: 22 Apr 201225 Apr 2012

Publication series

NamePaper Conference and Trade Show 2012, PaperCon 2012: Growing the Future - Co-located with Control Systems 2012
Volume1

Conference

ConferencePaper Conference and Trade Show 2012: Growing the Future, PaperCon 2012 - Co-located with Control Systems 2012
CountryUnited States
CityNew Orleans, LA
Period22/04/1225/04/12

Keywords

  • Polymer spraying
  • Polymers
  • Tensile strength

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