Vibrational property changes of spruce wood by impregnation with water-soluble extractives of pernambuco (Guilandina echinata Spreng.)
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Sitka spruce (Picea sitchensis Carr.) was treated with water-soluble extractive components of pernambuco (Guilandina echinata Spreng. syn Caesalpinia echinata Lam.) by two methods: impregnation under evacuation using an aspirator and repetitive surface application using a brush. The influence of these treatments on the vibrational properties were examined. The loss tangent (tan δ) of the impregnated specimen decreased, up to nearly a half of its original value, with increasing weight gain. It is suggested that the decrease in tan δ results from impregnation of the extractive components into the amorphous region of cell walls, forming secondary bonds between matrix substances. The surface application of the extractive components, on the other hand, hardly brought about the desirable change in vibrational properties.
Key wordsPernambuco Vibrational property Extractives Impregnation Musical instrument
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- 1.Sugiyama M, Matsunaga M, Minato K, Norimoto M (1994) Physical and mechanical properties of pernambuco (Guilandina echinata Spreng) used for violin bows (in Japanese). Mokuzai Gakkaishi 40:905–910Google Scholar
- 4.Norimoto M, Tanaka F, Ohgama T, Ikimune T (1986) Specific dynamic Young's modulus and internal friction of wood in the longitudinal direction (in Japanese). Wood Res Techn Notes 22:53–65Google Scholar
- 7.Obataya E, Norimoto M (1995) Acoustic properties of cane (Arundo donax L.) used for reeds of woodwind instruments. I. The relationships between vibrational properties and moisture contents of cane (in Japanese). Mokuzai Gakkaishi 41:289–292Google Scholar
- 8.Obataya E, Norimoto M (1995) Acoustic properties of cane (Arundo donax L.) used for reeds of woodwind instruments. II. Analysis of vibrational properties by a viscoelastic model (in Japanese). Mokuzai Gakkaishi 41:449–453Google Scholar
- 9.Norimoto M (1982) Structure and properties of wood used for musical instruments. I. On the selection of wood used for piano soundboards (in Japanese). Mokuzai Gakkaishi 28:407–413Google Scholar
- 11.Yano H, Matsuoka I, Mukudai J (1992) Acoustic properties of wood for violins (in Japanese). Mokuzai Gakkaishi 38:122–127Google Scholar
- 12.Yano H, Yamada T, Minato K (1986) Change in acoustical properties of sitka spruce due to reaction with formaldehyde (in Japanese). Mokuzai Gakkaishi 32:984–989Google Scholar
- 13.Akitsu H, Norimoto M, Morooka T (1991) Vibrational properties of chemically modified wood (in Japanese). Mokuzai Gakkaishi 37:590–597Google Scholar
- 14.Akitsu H, Norimoto M, Morooka T, Rowell RM (1993) Effect of humidity on vibrational properties of chemically modified wood. Wood Fiber Sci 25:250–260Google Scholar