Rotary veneer peeling of softwoods, 2: Pinus caribaea from Fiji and P. merkusii and P. kesiya from Indonesia
Takano, T. (Forestry and Forest Products Research Inst., Kukizaki, Ibaraki (Japan)) | Kinoshita, N.
A veneer peeling test was performed on Pinus caribaea from Fiji and P. merkusii and P. kesiya from Indonesia. The effects of veneer nominal thickness and horizontal bar opening on veneer quality, viz., variation of veneer thickness, lathe check depth and roughness of veneer surface were investigated. 1) Although tropical hardwood generally tends to have a large variation in veneer thickness, as the veneer nominal thickness increases, in these three species similar tendency was not found. In P. merkusii and P. kesiya, the variation of veneer thickness was large even when the veneer nominal thickness was small. 2) Depth of lathe checks increased with the veneer nominal thickness. In P. merkusii and P. kesiya, depth of lathe checks were 50-60% of veneer thickness at 7.5mm nominal veneer thickness and about 20% at 3mm nominal thickness. In P. caribaea, lathe check depth varied only slightly. Percentage of lathe check depth was 50% even at 1.5mm nominal thickness. The difference in percentage of lathe check depth of the cutting in two growth ring slopes, with the growth rings and against the growth rings, was not clearly shown. 3) Roughness of veneer surface varied markedly over 6mm nominal thickness in P. merkusii and over 3mm nominal thickness in P. kesiya. While in P. caribaea, roughness varied somewhat with nominal thickness of from 1.5mm to 3mm and was almost constant at over 3mm nominal thickness. Roughness of the surface against the growth rings was larger than that with the growth rings, and the surface in the former was rougher than in the latter at thicker nominal thicknessShow more [+] Less [-]
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