Rutary Veneer Catting of Small-Diameter Trees of Soltwood from Thinning

1987 Fiscal Year Final Research Report Summary

• Project/Area Number: 61560200
• Research Category: Grant-in-Aid for General Scientific Research (C)
• Allocation Type: Single-year Grants
• Research Field: 林産学
• Research Institution: Tokyo University of Agriculture
• Principal Investigator: HAYASHI Daikuro Tokyo University of Agriculture, Faculty of Agricuture Professor, 農学部, 教授 (30078042)
• Co-Investigator(Kenkyū-buntansha): KOBAYASHI Jun Tokyo University of Agriculture, Faculty of Agriculture Instructor, 農学部, 講師 (20112881) ; SHIOKURA Takayoshi Tokyo University of Agricalture, Faculty of Agriculture Professor, 農学部, 教授 (80078104)
• Project Period (FY): 1986 – 1987
• Keywords: trees from Hinning / veneer cutting / LVL / Knot / danmage of knife edge / microbevel / raughness of knife edge / フローティングバー

Research Abstract

In out country, the logs for plywood were large-diameter hardwoords. On the other hand, the utilizations of small-diameter softwoods from thinning are the important theme in recent wood industry. In the utilization of small-diameter logs for veneer, the damage of knife edge due to cutting of knot and the clogging of the gap between the knife and nose bar are the most important ptoblem.
Therefore, we investigated the effects of knife edge with microbevel in the cutting of knot and the veneer cutting with the use of a floating bar. 1) The knige edge (SKH 9) with 30゜ of knife angle was not damaged after the cross sectional cutting of the branch(Sugi:air-dried wood, depth of cut: 1 mm). 2) Juding from the influence of cutting angle on the quality of veneer, experimental level of mainbevel angle(12゜,14゜,16゜,18゜,20゜) were choised. 3) The best profile of the knife edge was mictobevel angle 30゜, mainbevel angle 16゜ and land width 0.1 mm ( Sugi: water saturated,depth of cut: 2 mm). 4) The efficiency of the floating bar on the quality of veneer was confirmed, and the suitable edge angle of the bar was 70-75゜,