Published on : Monday, July 18, 2016
Patching is the process of removing defects from the veneer raw material, increasing the amount of valuable surface veneer. This is a practical solution to the current situation, where there has been a growing demand of panels, but a decrease on the large-diameter logs available.
“Our goal was to develop an automated patching line. We wanted a line suitable for a variety of wood species, patch shapes and veneer thicknesses. Also, we wanted to improve the raw material utilization ratio and work output, making patching more cost-efficient”, describes Erkki Kauranen, Patching Technology Manager from Raute’s Mecano business unit. “A fully automated patching line can make about 3,000 patches/h/patching level”, added Hanna Lankinen, Product Manager of Veneer Patching from Raute.
“As of now, four RauteSmart patching lines have been sold; three birch veneer lines to Russia and one pine veneer line to Chile. These lines are fully automated and can be operated by just one person. The Chilean line will also be equipped with a by-pass conveyor and a hot melt gluing system, ensuring patch retention on thin veneer, or if the patch needs to be of a certain shape”. Kauranen says.
With P2, effort was put on improving the dies’ durability. Its cutting tools are made from solid tool steel and automatically calibrated after sharpening. Each die has a 5 mm (0.197 in) room for sharpening. As one sharpening takes 0.1 mm (0.00394 in) of space, and you need only one sharpening per year, the lifespan of a die has been greatly improved.