Forming of Rotary-Cut Japanese Cedar Veneer by Taking Advantage of Its Fluidity

Abstract

Backward extrusion was performed on two-layered rotary-cut veneer disks. The angular difference of the fiber orientation between the two disks influenced formability. The earring of the wall was largest when the fiber orientations of the two disks were parallel to each other, whereas it was smallest when the fiber orientations of the two disks were perpendicular to each other. Cups were produced from six-layered rotary-cut veneer disks by backward extrusion. The deformation and formability depended strongly on the arrangement of the disks. To prevent cracking in the wall and mold successfully, it is better to place the disks with the fiber orientation of adjoining disks perpendicular to each other. This enables the fiber cells of the disks to intertwine with each other. Heat treatment was performed on the cups to improve water stability. The cups not subjected to heat treatment failed to keep their shapes in water. On the other hand, the cups subjected to heat treatment (250°C for 60 minutes) had excellent water stability and showed no swelling on exposure to water.