In hardwoods, the pressure gradient also ruptures tyloses
in the vessels increasing permeability in the longitudinal direction.
Red oak lumber can be separated from white oak by the number of pores in summerwood and because, as a rule, it lacks the membranous growth known as tyloses
in the pores.
As oak (red and white) is an important species with 50 percent of the wood flooring market (Anonymous 2006), and as it is among the species known to be prone to check due to the important presence of tyloses
, and to limit the parameters of the study, white oak was selected for this study.
Because the wood has a preponderance of tyloses
in the pores, which make it impossible for liquids to seep through, oak makes wonderful casks.
The data suggest that emissions were inhibited in white oak, possibly by tyloses
The larger diameter vessels facilitate the movement of liquids if there is no tyloses
formation, which increases bonding quality (Dogu 2000).
Wood may be highly porous, but because of pit aspiration, tyloses
, or other impediments to flow, have low permeability and not allow the movement of lubricant through its structure.