PAPER making! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL Volume 6, Number 1, 2020
multilayer composites allow forming (technologically difficult) spherical shapes, without additional heat and pressure treatment. The type of an outer layer material strictly determines the usability and ease of two Ǧ axial bending process. Presented composites are interesting materials, that can be adopted into the wood industry as a replacement for traditional materials, e.g., bent plywood. Experimental Study on Combustion Properties and Thermo-Gravimetric Analyses of Oriented Strand Board (OSB), Fatih Yapici, Wood Industry / Drvna Industrija, Vol.71(1). This study investigates the effects of types of adhesives on the combustion properties of oriented strand board panels (OSB). Combustion test was performed according to ASTM E69 standard. Mass reduction, change of temperature and released gas (CO, NO, O2) were measured every 30 seconds during this test. Thermogravimetric analysis (TGA) of the OSBs was also carried out. While the highest temperature value of combustion was only obtained for the samples with phenol-formaldehyde at both outer and inner layer of test panels, the lowest temperature value was obtained for test samples with phenol-formaldehyde on the outer layer and isocyanate on the atinner layer. In the results of TGA, test mass reduction of OSBs was similar to each other, and most of the mass loss occurred at the temperatures between 200 and 400 °C. Evaluation of mechanical properties of OSB/3 after repetitive soaking and oven- drying cycles, Regino Kask et al, Wood Material Science & Engineering (2020), online . The objective of this study was to evaluate some mechanical properties of OSB/3 after one to ten cycles of soaking and oven/drying (accelerated aging). The modulus of rupture (MOR), modulus of elasticity (MOE), found by 3-point bending and screw withdrawal load (SWL), were determined in dry and wet conditions in the face and back surface, and in the cutting edge. The specimens were soaked for 24 hours and dried for 48 hours in a ventilated drying box. The MOR, MOE and SWL values dropped significantly after the first cycle, continued to decrease after three cycles and stabilized in the last cycles of soaking and drying. The surface and cross-sections of the samples were also studied using the X-ray technique. This analysis explained a significant decrease in the values of the studied properties after the first soaking cycle as a result of non-restored plastic deformation of the resin matrix. The low retention values of the studied properties could raise the durability issue of the investigated commercial OSB/3 boards as they should be moisture resistant according to EN 300:2006.
Technical Abstracts
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