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Rotary veneer peeling of softwoods iv. heated akamatsu wood



Rotary veneer peeling of softwoods iv. heated akamatsu wood



Bulletin of the Forestry and Forest Products Research Institute (362): 143-154



A veneer peeling test was conducted for heated Akamatsu (Pinus densiflora) blocks soaked in hot water of 50.degree. C, 70.degree. C and 90.degree. C with a conventional veneer lathe in order to investigate the effect of heating temperatures and horizontal bar-openings, 90%, 95% or 100%, on veneer quality, compared with blocks soaked in cold water. Veneer surface roughness, lathe check depth and lathe check interval were measured, and their changes were examined in relation to the annual ring angle to veneer surface in the veneer cross section. (1) As block temperature rose, veneer surface roughness varied differently depending on the annual ring angles. The surface of veneer cut against the annual rings was smoother with heated blocks at a narrow bar-opening, while the veneer surface was rough with a small annual ring angle with heated blocks, which caused the separation of earlywood fragments from the veneer surface. (2) Heating of blocks produced a decrease of lathe check depth and lathe check interval, and their difference between heating conditions of 70.degree. C and 90.degree. C was small. Without the heating of blocks, lathe checks when cutting along the annual rings were shallower than those when cutting against the annual rings, and the tips of lathe checks tended to stop around latewood at a narrow bar-opening with unheated blocks. There is, however, almost no difference in lathe check depth between various annual ring angles with heated blocks. (3) At the temperatures of 70.degree. C and 90.degree. C, the checks on the tight side of veneer and the veneer separation could be often found along annual ring borders when cutting against the annual rings. When the checks and the separation were severe, continuous peeling was impossible due to the plug-up between the knife and the nosebar or veneer separation along the annual ring border. The reasons for this occurrence of checks and the separation along the annual ring border in heated block peeling were discussed in relation to wood anatomical structure and property changes of wood chemical components by heating. At the heating temperatures of 70.degree. C and 90.degree. C, fuzzy grain and discoloration of the veneer surface were also observed.

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