efeito de ciclos de umidade relativa e temperatura do ar na resistência de juntas colodas com lâminas de eucalyptus grandis w. hill ex maiden, eucalyptus saligna smith e chapas de fibra de densidade média (mdf) air relative humidity and temperature cycle effects on the resistence of glued joints between bords of eucalyptus grandis, eucalyptus saligna and medium density fiberbord (mdf)
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Abstract
The objectives of this work was to evaluate the effect of air relative humidity and air temperature cycles on glue line resistance of glued veneer joints of Eucalyptus grandis, Eucalyptus saligna and medium density fiberboard (MDF). Densities of Eucalyptus grandis, Eucalyptus saligna wood and MDF were equal to 0,60, 0.66, e 0.72g/cm³ respectively. Medium viscosity polyacetate and urea-formaldehyde adhesives were applied at rate 150g/cm² and 180g/cm², respectively, on one face. Sample mean moisture content was 14%. Relative humidity and temperature cycles affected both resistance and percentage of wood failure. Higher values of resistance were observed on the glue line between Eucalyptus saligna wood after equilibrium on the first cycle. The lowest values were always observed on the glue line between wood veneer and MDF. Considering only wood, the highest wood percentage failure was observed among Eucalyptus grandis veneer samples. On the glue line between eucalyptus veneer and MDF the failure always occurred inside the MDF. Considering the interaction between samples composition and adhesive type, it was observed that the highest resistance occurred with Eucalyptus saligna veneer using urea-formaldehyde adhesive.
| Reference Key |
vital2005revistaefeito
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|---|---|
| Authors | ;Benedito Rocha Vital;Antônio da Silva Maciel;Ricardo Marius Della Lucia |
| Journal | journal of veterinary medical research |
| Year | 2005 |
| DOI |
10.1590/S0100-67622005000500015
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| URL | |
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