Skip to Main Content
Flake storage effects on properties of laboratory-made flakeboardsAuthor(s): C. G. Carll
Source: (Research note FPL ; RN-0267):10 p. : ill. ; 28 cm.
Publication Series: Research Note (RN)
Station: Forest Products Laboratory
View PDF (270 KB)
DescriptionAspen (Populus gradidentata) and loblolly pine (Pinus taeda) flakes were prepared with tangential-grain and radial-grain faces on a laboratory disk flaker. These were gently dried in a steam-heated rotary drum dryer. Approximately 1 week after drying, surface wettability was measured on a large sample of flakes using an aqueous dye solution. Three replicate boards of each combination of flake species and face grain were then fabricated. Each of the three replicate boards was made with a different adhesive resin. The three adhesives were urea-formaldehyde, phenolic, and neat isocyanate. The procedure (wettability measurements and board fabrication) was repeated at 1 month, 6 months, and 12 months after flake preparation. Surface wettabilities were reduced as the flake surfaces aged. Tension strengths of boards perpendicular to their faces (internal bond strengths) were also reduced as flake surfaces aged, and reductions in internal bond strengths and surface wettabilities appear to be related. Bending properties were, in general, not influenced by flake age. The observed reductions in internal bond strengths suggest that laboratory storage of flakes for much longer than 6 months is not a good practice. However, no conclusive statements can be drawn from this work concerning the influence of flake aging on board properties.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationCarll, C. G. 1998. Flake storage effects on properties of laboratory-made flakeboards. (Research note FPL ; RN-0267):10 p. : ill. ; 28 cm.
KeywordsFlakeboards, Physical properties, Bond strength, Storage, Wood chips, Flakes, Internal bond, Wettability
- Development of unbonded and bonded areas in relation to Populus species wood characteristics in grinding
- The influence of felling season and log-soaking temperature on the wetting and phenol formaldehyde adhesive bonding characteristics of birch veneer
- Construction variables considered in fabrication of a structural flakeboard
XML: View XML