Dynamic Wettability of Different Machined Wood Surfaces

Title
Dynamic Wettability of Different Machined Wood Surfaces

DOI:

10.1080/00218460108029625

Author 

Micael Stehr^a, Douglas J. Gardner^b & Magnus E. P. Wålinder^b

pages 185-200

Publishing models and article dates explained

• Received: 8 Jul 2000
• Accepted: 20 Feb 2001
• Published online: 23 Sep 2006
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• Abstract
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• Wetting dynamics on machined wood surfaces is of great interest for the adhesive bonding technology of wood. In this work, the change of apparent contact angles with time of phenolresorcinol-formaldehyde (PRF), polyvinyl-acetate (PVAc), and a series of probe liquids on sawed, planed, sanded, and razor-blade-cut wood surfaces of Southern pine was studied by the sessile drop method using a CCD camera technique. The results indicate that the fastest wetting of the probe liquids occurs on the sanded surfaces because of higher surface roughness and the resulting increase in capillary forces as compared with the sawed, planed and razor blade cut surfaces. The fastest wetting of the PRF and PVAc resins occurred on the comparably smooth planed and razor-blade-cut wood surfaces. A smoother wood surface seems to provide better wetting and penetration properties for high-viscosity liquids such as adhesives, which probably can be attributed to less entrapment of air between the resin and the wood structure.

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http://www.tandfonline.com/doi/abs/10.1080/00218460108029625#abstract