Abstract
Effect of internal and surface sizing on the wetting and absorption behavior of a water droplet on paper was studied. Two individual internally sized papers were selected (AKD, ASA) and surface sized using different concentrations of a mixture of a sizing polymer (Styrene Maleic Anhydride) and starch. Measuring the apparent contact angle of water droplets on papers revealed that the wetting characteristics of the surface varied as a function of the concentration of the sizing polymer (SMA) on the surface. Wetting and absorption were found to be two sequential phenomena. The equilibrium contact angle (e*) increased with the SMA concentration. Highly hydrophobic paper surfaces result from the combination of internal and surface sizing (e*>110°). The delay before bulk absorption was also a function of SMA concentration on the surface. Delay was related to SMA dissolution into the water droplet, which produced hydrophilic channels locally (e*<90°). Unsteady stick and jump movement of the contact line during wetting was significant and decreased upon calendering.
Original language | English |
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Title of host publication | Proceedings of the 87th PAPTAC Annual Meeting |
Volume | B |
Publication status | Published - 1 Dec 2001 |
Event | Annual meeting of the Pulp and Paper Technical Association of Canada (PAPTAC 2001) - Palais des Congrs, Montreal, Canada Duration: 29 Jan 2001 → 1 Feb 2001 Conference number: 87th |
Publication series
Name | Annual Meeting - Technical Section, Canadian Pulp and Paper Association, Preprints |
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ISSN (Print) | 0316-6732 |
Conference
Conference | Annual meeting of the Pulp and Paper Technical Association of Canada (PAPTAC 2001) |
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Abbreviated title | PAPTAC 2001 |
Country/Territory | Canada |
City | Montreal |
Period | 29/01/01 → 1/02/01 |
Keywords
- Absorption
- AKD
- ASA
- Internal sizing
- Paper
- SMA
- Surface sizing
- Wetting