THE DETERMINATION OF THICKNESS SWELLING OF ORIENTED STRAND BOARD(OSB) MANUFACTURED FROM SCOTS PINE BY USING CAST-POLYAMIDE

摘要

This study was carried out to determine the effects of using cast-polyamide on the thickness swelling (TS) of oriented strand board. All of test panels were bonded with phenol-formaldehyde resin at (6%) with three-layer cross-aligned OSBs. Strands used for the production of test panels were made up 50% of core layer and 50% of outer layers. Test panels were pressed in 6min, 4N/mm2 press pressure and 185±3°C press temperature by aiming for a target density of 700kg/m3. Firstly, control panels was manufactured, and also four OSBs produced by adding cast-polyamide with 20% - 30% ratio compare with weight of oven dry wood particle both out layer and inner layer of test panels. It was showed that thickness swelling ratio values were changed between 28.47% –36.61%, and the value of TS decrease as the ratio of cast polyamide increase.