OSB Long log flaker - Type PZU

We have developed the world’s largest strander: Due to the design of its knife ring with a 2,500 mm diameter, a cutting width of 850 mm, 56 knives, as well as a maximum material throughput of 45 metric tons per hour bone dry, the new OSB flaker is considered a giant. Stranders of the PZU series are able to process logs to high-quality strands with a specific length, width, and thickness. Therefore, these machines are the best choice for the production of high-quality flakes in large quantities for OSB and wafer boards. 

Features, Function

These machines have a modular design and consist of a loading station and a cutting machine. Logs, the preferred feeding material, are fed either via a crane from above directly to the loading station or from a storage deck from the side. The plate conveyor installed directly in front of the flaker pushes the logs in cycles into the cutting chamber.
 
To implement even higher throughput amounts with even higher strand quality, it is recommended to use logs with a length that is uniform and adjusted to the loading station. The cut-to-length logs are collected in the feed area via a crane, adjacent supply conveyor, or via a fully automatic dosing conveyor and then placed in the loading station. After loading is completed, a log pusher pushes the logs into the feeding area. Another advance carriage then feeds the batch of logs in cycles to the flaking chamber.
 
The flaking process takes place in cycles by a knife ring on the inside of the cutting chamber. The combination of the high-performance hydraulic positioning unit and the intelligent PLC control provides for consistent traversing speeds even at varying loads. The knife ring is made with high accuracy from high-strength, low-wear steels. Since all wear parts can be easily replaced, high service life of the knife ring is ensured. The arrangement of the knives in a ring and their angle during cutting allows the production of flat uniform strands with a smooth surface.
 
The outstanding function of the loading conveyors in connection with the perfectly adjusted cutting geometry of the flaker, allows cutting of the wood parallel to the fiber direction. Strands with a length of 12 mm to 800 mm and a thickness ranging from 0.4 mm to 2.0 mm can be produced. The length of the strand is determined by the scoring tips integrated into the knife holders . The flaker knives are simple strip knives.  
 
The machine features an almost fully automatic knife change. During this process several knife assemblies are automatically released and ejected to the front. Once the new knife assemblies are inserted, the machine secures the knives in their places, turns the ring, and releases the next knife assembly for replacement – all fully automatic. In this way, extremely short knife changing times can be achieved.