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Effects of Polyethylene Glycol Treatment for Improvement of Preservative Penetration and Prevention of Drying Check of Preservative Treated Round Post  

Lee, Jong-Shin (Dept. of Forest Products, Chungnam National University)
Yoon, Sun-Mi (Dept. of Forest Products, Chungnam National University)
Publication Information
Journal of the Korean Wood Science and Technology / v.30, no.4, 2002 , pp. 27-32 More about this Journal
Abstract
We investigated the effect of polyethylene glycol(PEG) treatment of preservative treated green japanese cedar(Cryptomeria japonica) round posts on their preservative penetration and check formation during the air drying. The round rods were dip-treated in 10% preservative solution of Basilit CFK for 1 day, followed by application(3, 5, and 10 times) with 50% PEG-400 solution, and then dried for 30 days under natural conditions. The rate of preservative penetration into sapwood was a low by 23.2% without PEG treatment, whereas that was a high by about 51.2~64.5% with PEG treatment. From these results, it was assumed that PEG played an affirmative role in the penetration of preservative components loaded onto the surface of round rods by dipping. During the air drying, the formation of drying checks decreased significantly with increasing application times of PEG. Even though some drying checks in PEG treated rods were developed, the number and size of checks was reduced remarkably by PEG treatment. After 2 months of outdoor exposure, PEG treatment failed to reduce checking in preservative-treated rods whereas finishing of polyurethane resin lacquer after PEG treatment was significantly effective in preventing check development.
Keywords
polyethylene glycol; preservative penetration; drying check; green round post; polyurethane resin lacquer;
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