Permeabilidade das madeiras de amapá (brosimum parinarioides ducke) e faveira (parkia gigantocarpa ducke)

Abstract

In the states of Amazonas and Pará, wood of amapá (Brosimum parinarioides Ducke) and faveira (Parkia gigantocarpa Ducke) are used to produce hardboard, furniture, boards, etc. Although being multipurpose, research on these species, addressing physical, anatomical and chemical properties are scarce. Among these features, permeability is a strong indicative of wood permeability to chemical preservatives, removal of water during drying or collage. This work aimed to study wood permeability of two woody species from amazon forest: amapá (Brosimum parinarioides Ducke) and faveira (Parkia gigantocarpa Ducke), using gaseous and liquid flow. It was verified the influence of anatomical and chemical characteristics on wood permeability. Values of permeability determined in laboratory were compared with data estimated by the longitudinal flow model for broad-leaved species. In order to conduct this study it was collected three trees of amapá and faveira in the state of Pará, which were processed in specimen that were submitted to assays of permeability, anatomical characterization and chemical analysis. The wood of faveira presented values of longitudinal permeability to atmospheric air of 140,2 .10-9 m3/m.(N/m2).s and liquid of 3,28 .10-9 m3/ m.(N/m2).s. The air permeability of the wood was amapá of 63,7 .10-9 m3/m.(N/m2).s and liquid of 2,0,7.10-9 m3/m.(N/m2).s. It was also observed low correlation for both species between air an liquid permeability with anatomical characteristics. Already the longitudinal flow model for hardwoods overestimated the permeability for both species.