1-Log Selection :
The logs to be used in plywood production should be suitable for peeling. Form should be smooth and cylindrical diameters should start from 30 cm minimum. The form is not smooth and cylindrical diameter of less than 30 cm, the efficiency of the logs is low and the number of pieces will be more than a waste.
Local logs such as beech, Poplar and Pine are mainly used as peelage logs in our country. These logs can also be imported from countries such as Ukraine, Romania, Russia. Beech, poplar, pine trees are preferred because they are more economical. In addition, of African origin, okume, tetra, ekabe, gombe, ozigo, like the timber yields and high quality but they are very limited economically costly to use as it has become more of Rina and Lloyd, has been the choice of yacht and boat manufacturers with higher added value. Because the costs of these tree species are very high compared to other tree species, they are not much preferred in plywood production.
2 – TOMRUK STEAMING PROCESS
The reason for the steaming process is to reduce the hard and low water logs to a certain softness during the peeling and to provide elasticity to increase the bending strength of the pile. The steam softened log is easily peeled and the peeled papel is soft, so they do not crack or break, thus reducing the loss and increasing the quality. The steaming process starts with low temperature depending on the type and hardness of the log, and it is left or steamed in 90-100 degrees steam or water for 48 hours to 72 hours.
3 – SLOT SIZING PROCESS
The heads of the logs that are subjected to steaming process are arranged and cleaned from cracks and curvatures, then the log, which is classified as surface and interior material, is taken to the sorting process, the logs that are sized as interior material and cover according to the size of the log to be manufactured are ready for the next stage.
4 – STRIPPING PROCESS
The sorted logs are peeled and turned into papel in log peeling machines called lathe machines. The peeled logs are cut to size by means of automatic shears at the same time and the papels are stacked and made ready for drying.
5 – DRYING PROCESS
The materials that are peeled into wet papel are passed through drying ovens with hot air at 150-180 degrees and their humidity is reduced to 10 -12%, the humidity-reduced papel is selected as inner material, surface material and piece material, without adding piece materials, they are ready for gluing and pressing. .
6 – GLUE PROCESS
The number of layers is formed according to the thickness of the plywood to be produced with the interior material and surface material papel, which are made into one piece by adding, and the papel is placed on top of each other as glued and glue-free papels, and then they are prepared for a cold press.
7 – COLD AND HOT PRESSING PROCESS
The papel, which is glued, is first subjected to cold press process in order to be printed. After cold pressing, the materials are subjected to hot pressing at a temperature of 100-110 degrees and a certain pressure and pressing time that varies according to the thickness of the plywood to be produced. The hot pressing process is kept under pressure for a period varying according to the thickness of the plywood.
8 – SIZING CALIBRATION AND SANDING PROCESS
After the materials coming out of the hot press are allowed to cool, they are made to be sized properly and according to the manufacturing conditions by sizing, during the sizing process, the defective materials are separated by quality control and they are classified according to their quality and class. The sized materials are then subjected to a calibrated sanding process, palletized and strapped according to the order quantity, ready for shipment and offered to the market.
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