Efecto de los acabados en la durabilidad de la madera de diez especies provenientes de plantación forestal de rápid

Efecto de los acabados en la durabilidad de la madera de diez especies provenientes de plantación forestal de rápido crecimiento

This study evaluated wood color change (∆E*) and the surface quality in ten tropical wood protected with three finishes (based in wax and polyurethane) and coatings development for tropical conditions in natural (NW) and accelerated (AW) weathering condition. The results showed  that  the  application  of  these  finishes,  decreased  lightness  (L*),  increased  the redness  (a*)  and  yellowness  (b*)  parameters  in  all species. ∆E*values  found  in  different finishes and coatings are cataloged as total change of color. It was found that NW produced the  higher ∆E*  and  defects  in  the  coating  than  AW.  Other  important  results  was  that tropical clear wood with natural coating produces the higher ∆E* than dark wood color. L* and  b*  parameters  were  the  most  significantly  effects  on ∆E*  of  coatings,  but  any treatments  of  surface   of  wood   L*,  a*  and   b*  affects∆E*.   The  stains  and   fungal development was observed in polyurethane finishes in NW, but not AW. The irregular and mosaic  flaw  were  not  observed.  The  quality  index  created,  which  includes  long  and  short line  and  switch  flaw  was  lowest  in  NW  and  was  lowest  in  waxy  finish  and  the  highest polyurethane finish.