Da Silva, Sérgio Augusto Mello [UNESP]Gonçalves, Raquel2014-05-272014-05-272007-06-01Scientia Forestalis/Forest Sciences, n. 74, p. 19-26, 2007.1413-9324http://hdl.handle.net/11449/69701The goal of this research was to determine the density distribution in medium density fiberboard (MDF), manufactured with polyurethane derived from castor oil using, ultrasonic wave technique. The equipment used in this test is Steinkamp BP7 with plan and exponential transducers, both with 45 kHz frequencies, located in several zones on the plate in order to determine wave ultrasonic velocity. The Pinus caribaea and Eucalyptus grandis fiberboard were manufactured in the quality control and products development laboratory of Duratex with 500 mm long, 500 mm large, 8 and 15 mm of thickness. Three MDF for each fiber specimen and thickness were fabricated, totalizing twelve plates tested. The MDF were produced with 5% polyurethane addition, in temperature of 160°C, tension press of 53 bars and addition of moisture content of 12%. For determination of fiberboard density, samples were extracted from the same zones where the wave ultrasonic velocity was determined. In this case, DAX-Ray equipment was used. Statistical analysis shows good agreement with wave ultrasonic velocity and the density profile, validating the application of non-destructive technique in order to determine the density profile of MDF's.19-26porMedium density fiberboardNon-destructive testUltrasonic waveDAX-RayMedium density fiberboard (MDF)Steinkamp BP7Nondestructive examinationPaperboardsPolyurethanesStatistical methodsTransducersVegetable oilsDensity (specific gravity)Castor OilDensity MeasurementFiber BoardsArtigoWOS:000208714500002Acesso aberto2-s2.0-345473973392-s2.0-34547397339.pdf1457178419328525