Improving the smoothness/bulk relationship through a pure fines layer on the paper surface

Leo von Hertzen, Erkki Saharinen, Jari Sirviö

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Abstract

One of the most desired targets of papermakers in recent decades has been to produce smooth papers with high bulk. This study reveals the potential of a layered sheet structure for improving the smoothness/bulk -relationship. The aim was to determine how paper properties develop when fines are increasingly taken from the base layer and redistributed on the paper surface. The study was performed using TMP (Thermo Mechanical Pulp) as the raw material. Sheets with a layer of fines deployed on the surface were prepared with a dynamic sheet former. Laboratory scale studies showed that paper smoothness, bulk, surface density and print density simultaneously increased by deploying some of the fines fraction of a mechanical pulp on the paper surface once the fibrous backbone has been formed using the same mechanical pulp with reduced fines content. Reduction of internal bonding was a drawback of the method. Optical properties were retained at least the same level as the reference sheets.
Original languageEnglish
Title of host publicationPTS Paper Symposium 2012 Proceedings
Subtitle of host publicationMunich, Germany, 11-14 September 2012
Pages36-A1 - 36-11
Publication statusPublished - 2012
MoE publication typeNot Eligible

Fingerprint

Mechanical pulp
Thermomechanical pulp
Raw materials
Optical properties

Keywords

  • Paper
  • smoothness
  • bulk
  • layering
  • fines

Cite this

von Hertzen, L., Saharinen, E., & Sirviö, J. (2012). Improving the smoothness/bulk relationship through a pure fines layer on the paper surface. In PTS Paper Symposium 2012 Proceedings: Munich, Germany, 11-14 September 2012 (pp. 36-A1 - 36-11)
von Hertzen, Leo ; Saharinen, Erkki ; Sirviö, Jari. / Improving the smoothness/bulk relationship through a pure fines layer on the paper surface. PTS Paper Symposium 2012 Proceedings: Munich, Germany, 11-14 September 2012. 2012. pp. 36-A1 - 36-11
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von Hertzen, L, Saharinen, E & Sirviö, J 2012, Improving the smoothness/bulk relationship through a pure fines layer on the paper surface. in PTS Paper Symposium 2012 Proceedings: Munich, Germany, 11-14 September 2012. pp. 36-A1 - 36-11.

Improving the smoothness/bulk relationship through a pure fines layer on the paper surface. / von Hertzen, Leo; Saharinen, Erkki; Sirviö, Jari.

PTS Paper Symposium 2012 Proceedings: Munich, Germany, 11-14 September 2012. 2012. p. 36-A1 - 36-11.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

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AB - One of the most desired targets of papermakers in recent decades has been to produce smooth papers with high bulk. This study reveals the potential of a layered sheet structure for improving the smoothness/bulk -relationship. The aim was to determine how paper properties develop when fines are increasingly taken from the base layer and redistributed on the paper surface. The study was performed using TMP (Thermo Mechanical Pulp) as the raw material. Sheets with a layer of fines deployed on the surface were prepared with a dynamic sheet former. Laboratory scale studies showed that paper smoothness, bulk, surface density and print density simultaneously increased by deploying some of the fines fraction of a mechanical pulp on the paper surface once the fibrous backbone has been formed using the same mechanical pulp with reduced fines content. Reduction of internal bonding was a drawback of the method. Optical properties were retained at least the same level as the reference sheets.

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von Hertzen L, Saharinen E, Sirviö J. Improving the smoothness/bulk relationship through a pure fines layer on the paper surface. In PTS Paper Symposium 2012 Proceedings: Munich, Germany, 11-14 September 2012. 2012. p. 36-A1 - 36-11