Published on January 1, 2019
Photos: Veli-Matti Lepistö
Plywood producers are facing more and more challenges in the availability of high-quality raw material. The percentage of small diameter logs is constantly increasing. At the same time, plywood mills are seeking an optimal way to utilize raw material. One solution is to invest in technology that converts side products into high-quality veneer. This is where RauteLite technology comes in.
BACK IN 2016, Sveza Kostroma plywood mill, one of the most modern and efficient birch plywood mills in Russia and a key production unit within the Sveza Group, decided to take a leap to maximize its raw material utilization. The solution was the RauteLite concept.
Line capacity, ease of use, high thickness accuracy and safety were clearly targeted in the investment.
High thickness accuracy
The idea was to increase mill recovery by re-peeling cores from the main lathe with the RauteLite peeling line. Cores from the recently modernized 8-ft Raute VE lathe are automatically conveyed to the RauteLite block sawing line, then peeled into a 4 x 4-ft dimension on the RauteLite peeling line. The dried veneers are composed into full 4 x 8-ft sheets used as short core veneers in the lay-up.
The delivery was made in summer 2017 and installation followed in the fall within the normal production. The line was tested with all different core diameters: minimum 73 mm, average 80 mm, Raute’s recommended 95 mm and even 200 mm diameter blocks (spinouts).
Various raw material qualities were tested as well: solid, core decay, soft decay, unconditioned, cylinder-shaped and conical cylinder-shaped blocks. With all raw materials, the line was able to peel veneer down to 30-mm cores. The line did not make miracles, if the wood material was too poor, but the most critical criteria – high thickness accuracy was achieved, always reaching the general target of +/- 0.1 mm tolerance.
The new investment has already proven to be successful for Kostroma. “It solves the problem by reducing the raw material consumption and changing the method of balancing the production of 4-ft and 8-ft veneers. This project allows us to save up to 800 m3 of raw material per month”, explains Director Viktor Tikhonov.
Viktor Tikhonov has worked in Sveza for 19 years and for 26 years in the plywood business in total. “The following main task for our mill will be cost reduction in all areas, and I look forward to the Raute G5 concept.”
Raute’s Sales Manager Kimmo Ahonen is proud to benchmark Sveza Kostroma’s RauteLite line which is not expensive or complicated to use, but provides new capacity from normally unused cores.
“Sveza Kostroma may have been the first to repeel cores on a separate line, but they surely won’t be the last. A new era to discover more with RauteLite has begun.”
SVEZA KOSTROMA FIRST TO REPEEL CORES ON A SEPARATE LINE IN EUROPE.
Efficient peeling of small diameter blocks
RauteLite peeling line was originally developed for the ease of use and the efficiency of peeling plantation logs. The new spindleless lathe utilizes Raute’s long experience in veneer peeling. Optimal peeling geometry (OPG) responds to the need of utilizing small diameter logs. Providing high recovery, it is an excellent solution to maximize veneer production together with main lathes. •