Abstract
The most critical factors affecting runnability of paper machines are
the tension and relaxation properties of wet paper. In this study, the effect
of electrolytes, pH and surface tension on dry and wet web properties was
investigated. Addition of a non-ionic surfactant at pH 6.5 and conductivity
level of 1 mS/cm, achieved by addition of CaCl2, decreased surface tension and
increased dry content. Density, air permeability and tensile strength
increased for dry sheets. Tensile strength and residual tension at 2% strain
of the wet web increased until a concentration of 0.25 g of surfactant/L of
water, primarily due to the increased dry content. Lowering of pH from 6.5 to
5, decreased dry content after wet pressing and air permeability of dry
sheets. Adjustment of conductivity with NaCl caused a decrease in both tensile
strength and residual tension for wet sheets
| Original language | English |
|---|---|
| Title of host publication | 7th International Paper and Coating Chemistry Symposium. Hamilton, Canada, 10 - 12 June 2009 |
| Place of Publication | Toronto, Canada |
| Publisher | Pulp and Paper Technical Association of Canada (PAPTAC) |
| Pages | 63-66 |
| Edition | cd-rom |
| ISBN (Print) | 978-0-9812879-0-4 |
| Publication status | Published - 2009 |
| MoE publication type | A4 Article in a conference publication |