The effect of chemical treatment and compression percent on mechanical properties of Paulownia compressed wood
Message:
Abstract:
Since human creation up to now، wood has been discussed as an important organic material، therefore its maintain and optimum usage is a considerable problem. From one hand، with due attention to condition of forest in Iran، using fast growing specie Paulownia provides new way in wood industries. But from other hand، this specie with low density has low strength. One of the suggested ways to increase density of this wood is its impregnation by resin and to compress it. In this research it is tried to increase the penetrability and impregnation of Paulownia by using urea formaldehyde resin at first pretreatment and then compression should be done. In order to perform this process، two variables pretreatment and compression percent were defined that each of them had two levels. The pretreatment was performed by NaCl and NaOH and 40، 50% compression. Totally، 72 samples were prepared and after producing the compressed wood، the absorption percent and mechanical properties were evaluated which included compression parallel to grain، modulus of rupture، modulus of elasticity in bending and impact strength. The results showed that the provided mechanical properties and pretreatments samples with NaCl had most values of these properties in 40 and 50% compression levels.
Language:
Persian
Published:
Iranian Journal of Wood and Paper Industries, Volume:5 Issue: 2, 2015
Pages:
59 to 70
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