Fixation of Compressed Wood Using Melamine-Formaldehyde Resin

Masafumi Inoue, Shigeyuki Ogata, Shuichi Kawai, Roger M. Rowell, Misato Norimoto

Abstract


Methods to maximize wood hardness and dimensional stability include various combinations of compression, heating, and chemical treatment. In this study, wood was treated with increasing concentrations of a low molecular weight, water-soluble melamine-formaldehyde resin solution (mol wt 380) and compressed while heated. This method achieved a maximum bulking efficiency of 5% and an antishrink efficiency of 45%, showing that the chemical had not completely penetrated the cell wall. Once the wood was treated, its ability to retain the compressed state was tested by immersing wood specimens in water at different temperatures. Specimens treated with an 8% resin solution retained almost complete fixation when soaked in room-temperature water, while those treated with a 25% solution retained fixation in boiling water. Moreover, a 25% solution of resin and a compression of 54% increased hardness from 0.48 to 0.72 MPa.

Keywords


Melamine-formaldehyde;compressed wood;permanent fixation;recovery of set;surface hardness

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