News Detail

Fully Automatic Solid Wood Processing With High Performance and Little Waste
2019-09-04
Fully Automatic Solid Wood Processing  With High Performance and Little WasteView over the tilt hoist destacker with subsequent brush roller and cross-cut saw

"PRAWDA" Sp. z o.o. (Olecko, PL) is a production and service company which was founded by Roman Prawda in August 1989. In the early stages the company manufactured soft toys and pillows, partly for IKEA. In 1997 they decided to start the production of plywood fittings. In 2000 PRAWDA expanded operations by another factory in Olecko. This factory specializes in the production of solid wood furniture and uses modern and varied machinery. High-grade wood from state forests is processed in their own sawmill and then a great variety of finished products is made during the following production processes. The residual timber is used to make wood briquets. Over the years, PRAWDA got many quality rewards, such as ISO, FSC, AES and others. To be able to maintain this high quality level in the future, PRAWDA decided to invest in a timber processing line from Paul Maschinenfabrik (Dürmentingen, Germany).

At the beginning of the production process, the dried birch stacks are transferred to the timber processing line by means of a forklift, singulated using a tilt hoist destacker and aligned along a zero line (flush with their leading edges). Subsequently there is a semiautomatic pre-cross-cutting operation in order to increase timber yield. A brushing machine is cleaning the dirt off the surface of the waney-edged workpieces to make it easier for the operator at the infeed system to recognize the quality zones. Then several sensors are first measuring the moisture as the workpieces are passing crosswise and afterwards they are measuring the wane position. Fully automatic turning of the workpieces around their longitudinal axis is then taking place, depending on the type and dimension of the cut.

The heart of this timber processing line is a POWER_RIP system, composed of an infeed system with top and bottom measuring unit as well as a rip saw model CGL-1110. The optimizing result calculated based on the workpiece geometry is indicated to the operator directly by means of laser lines on the workpiece. The optimizing software considers all contours, root collars as well as wane and presents the board to the operator’s critical eyes in the correct position. The operator checks the calculated result and can confirm or reject it. Before the workpiece is fed to the rip saw, the movable saw blades are moving with high precision to the target position.

The saw shaft operating in the feeding direction is equipped with four adjustable saw bushes as well as a zero saw blade and produces five variable strips. Due to the telescopic design it is possible to produce a minimum strip width of 20 mm. The precision of the saw bushes and their positioning technology results in a width tolerance of the ripped workpieces of maximally +/- 0.5 mm. This precision is also obtained when the system is operated in the automatic mode with a performance of 10 - 12 workpieces per minute without the intervention of an operator. This results in high daily outputs with little waste. The rip saw’s climb cutting technology also ensures glue-line quality cuts, even with complex material and high production outputs. The subsequent offcut separator neatly and reliably separates the waste pieces from the optimized workpieces. In addition, the quality zones on a workpiece are separated as well.

The CNC control which is outstandingly easy to operate is continuously logging the production progress. Statistical data in real time provide a quick and full overview of the production data. Network technology and Internet connection are not only suitable for production control, but also for work scheduling during operation. This results in minimum programming and setup times.