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Paper properties of TMP and CTMP handsheets from spruce, as affected by the solids content from pressing by Niklas Klinga; Hans Höglund; Christer Sandberg is a Engineering article available to read on EtoBox.

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This paper discusses how the properties of dry handsheets from two different mechanical pulps and one chemithermomechanical pulp and their respective long fibre fractions depend on the level of dryness to which the sheets are pressed at high temperature. Sheets were pressed and dried to different dryness levels at 400 kPa and 93°C in a modified Rapid Köthen dryer. Prior to testing of the physical properties, the sheets were dried without pressure at room temperature to full dryness and kept in a conditioning room. This was performed with the aim of evaluating the consolidation and development of final strength properties with respect to dryness after a press section in a paper machine. The most interesting finding from these trials was that the increase in density and strength were far from linear with increased press dryness, especially for the long fibre fractions when looking at the Z-strength development. There was a distinct inflection of the curve when the sheets reached a press dryness level of some 50%. The most important dryness interval for internal strength development was found between 50 and 80%. The fact that most paper and board machines press the sheet to only some

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Author

Niklas Klinga; Hans Höglund; Christer Sandberg

Publisher

Walter de Gruyter GmbH

Published

2007

Language

EN

Field

Engineering (Physical Sciences)