Calendering of coated paper at high speeds and temperatures

Taina Lamminmäki, Jaana Mikkilä, Ulla Forsström, Jukka Koskelainen

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

Abstract

Increasing calendering speeds are challenging paper mills to further develop their coating recipes and calendering conditions to maintain adequate surface properties. In particular, the trend towards higher calendering speeds is putting pressure on mills to raise roll temperatures. At high temperatures the viscoelastic behavior of latex becomes increasingly significant and has an important impact on surface properties. The significance of the gel content and glass transition temperature (Tg) of latex in coating and calendering was studied. The results indicated that at constant Tg the high gel content latex generated a denser, more closed coating structure than medium or low gel content latex. Low gel content latex produced the glossiest but most porous coating layer. In terms of the gloss increase achieved by calendering, it is best to use low Tg latex at low calendering temperature and high Tg latex at high temperature. Latex particle size also had an effect on paper properties. Smaller particles produced a rougher and less glossy surface. The results clearly showed that many coating properties after calendering were related to the coating properties before calendering.

Original languageEnglish
Title of host publicationEnergy, coating, efficiency
Subtitle of host publicationproceedings of the PulPaper 2004 Conferences, 1-3 June 2004, Helsinki, Finland
PublisherFinnish Paper Engineers’ Association
Pages81-88
Number of pages8
Publication statusPublished - 2004
MoE publication typeB3 Non-refereed article in conference proceedings
Event5th International Exhibition for Suppliers to the Pulp, Paper, Board and Conventing Industry, PulPaper 2004 - Helsinki, Finland
Duration: 1 Jun 20043 Jun 2004

Conference

Conference5th International Exhibition for Suppliers to the Pulp, Paper, Board and Conventing Industry, PulPaper 2004
Country/TerritoryFinland
CityHelsinki
Period1/06/043/06/04

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