Oregon State University

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Event Details

Thesis Defense: Elijah Wilson

Check Characterization in Maple Plywood

Friday, January 19, 2018 2:00 PM - 3:00 PM

Small hairline cracks called checks in the decorative face veneer of hardwood plywood are a costly problem for the hardwood plywood industry. Authors of technical and trade articles have provided an abundance of recommendations, advice and discussion on many potential causes of checking. These authors’ notes when combined have shown checking to be a very complex issue. Little research has been done on checking, and any research done has been challenged because check formation is sporadic and check detection and measurement are very time consuming. This all has created the need for a system which can rapidly identify and measure checks as they develop. Burnard (2012) created such a system using the principles of Digital Image Correlation (DIC). The present study follows-up this work by refining Burnard’s system and testing check development in hard maple veneer due to: veneer and core moisture content before layup (6, 12, and 20%), adhesive type (soy-based and urea formaldehyde) and core type (veneer core and medium density fiberboard). Strain in the x-direction (perpendicular to grain) and displacement calculated by DIC was placed into a custom check characterization software. Checks formed in only 21 of the 288 test panels, 17 of which were on a veneer core platform. Displacement, a measure of how much the veneer moves was also used to describe test panels. Displacement showed core, adhesive, veneer moisture content before layup and the interaction between core and adhesive to be statistically significant. These phenomena show manufacturers should be selective when choosing adhesive, use composite materials for core whenever possible and potentially make sure veneer is below 12% moisture content before layup. Displacement could also be used to predict checking in hardwood plywood.

Elijah Wilson is from Cottage Grove, Oregon. When not working on his research project, he enjoys spending time with family and friends. He enjoys hiking, rock climbing, gardening and helping others. Elijah regularly thinks of how fortunate he is to be a part of an industry which develops innovative solutions to wood-based problems!



Richardson Hall (campus map)
3180 SW Jefferson Way
Jessica King
Jessica.King at oregonstate.edu
Wood Science & Engineering
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