Mechanical And Physical Properties Of Medium Density Fibreboard With Calcite Additive

Abstract

In this study, it is investigated that are calcite filler can be used in the production of medium density fiberboard. Chips have been to the process of cooking for 4-5 minutes in Asplund defibrator with the vapor pressure of 7-7.5 bar, and 1800C temperature. 1.5% paraffin and 1% ammonium sulphate to be pulverized is added to fibers on the output of defibrillator and blowline line. Calcite fillers are prepared in a separate tank in order to use calcite 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 calcite, respectively with 3% (20 kgm(-3)), 6% (40 kg-m(-3)), 9% (60 kg-m(-3)). The fibers are dried to moisture of 8%-12%. This press applies temperature about 185-190 degrees C and pressure about 32-34 kg-m(-2) to the mixture material for 270 seconds during pressing time. MDF panels (2100 x 4900 x 18 mm) were produced in the process. Both mechanical and physical experiments are performed on boards which are produced.