The Utilizing Rock Salt of Inorganic Filler in Medium Density Fibreboard (MDF) Production

Abstract

Aim of study: To research the usage opportunities of the inorganic rock salt mineral in MDF production. Area of study: The materials were collected rock salt from cankiri region, wood from the Western Black Sea region, respectively. The production was performed in a private company in Duzce. The tests were performed at Duzce Forest Faculty Laboratory and Gazi Woodworking Industrial Engineering Laboratory. Material and methods: In the Asplund Defibrator, chips were baked wtihin 7-7.5 bar vapor pressure and 180 degrees C temperature for 4-5 minutes. According to the weight of dry fiber, 1.5% paraffin was given before fibrillation, fibrillation later was given 1% ammonium sulfate solution. Inorganic fillers prepared in a separate tank in order to use rock salt instead of lignocellulosic fibers in the production of 1 m(3) MDF. After that urea-formaldehyde glue is prepared as three different solutions which include the rock salt respectively with 3% (20 kg), 6% (40 kg), 9% (60 kg). This press applies 185-190 degrees C temperature and 32-34 kg/cm(2) pressure to the mixture material in 270 second pressing time. MDF panels (2100x4900x18 mm) were produced in the process. Physical, mechanical and combustion tests experiments are performed over boards. Main results: MDF products which were added percent 3 with the rock salt have more performance than the other MDF panels in this study. Highlights: The usage of the rock salt with percent 3 is recommended in MDF products.