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Effects of species and moisture content on penetration of liquid in laser incised lumber by the passive impregnation method

Einfluss der Holzart und Holzfeuchte auf die Eindringung von Flüssigkeit in Laser perforiertem Schnittholz bei der Tauchimprägnierung

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Abstract

Penetration of liquid by passive impregnation method for Douglas-fir (Pseudotsuga menziesii Franco), sugi (Cryptomeria japonica D. Don) and Japanese larch (Larix leptolepis Gordon) was studied. Effects of initial moisture content of sugi (16, 43 and 70% moisture content) on liquid penetration were also studied. Dried Douglas-fir (mc=14%) and sugi (mc=16%), and green Japanese larch (mc=45%) and sugi (mc=70%) were treated by passive impregnation method for penetration analysis. It was observed that dried sugi had the highest level of liquid penetration both in length (170 mm) and width (8 mm) for all measured sections followed by green sugi, green Japanese larch and dried Douglas-fir. In case of different initial moisture content, the highest absorption (624 kg/m3) and penetration (maximum 87 and 96% at cross and longitudinal surfaces, respectively) was observed for sugi having the lowest initial moisture content under the same passive impregnation conditions. Absorption and penetration decreased with the increase of initial moisture content for sugi. These results could help in designing incising pattern and density, as well as solving the problems related to high initial moisture content of wood for passive impregnation.

Zusammenfassung

Untersucht wurde die Eindringung von Flüssigkeit in Douglasien- (Pseudotsuga menziesii Franco), Sugi- (Cryptomeria japonica D. Don) und japanischem Lärchenholz (Larix leptolepis Gordon) bei der Tauchimprägnierung nach vorheriger Dampfbehandlung. Darüber hinaus wurde an Sugiholz der Einfluss der Holzfeuchte (16, 43 und 70% Holzfeuchte) auf die Eindringung von Flüssigkeit untersucht. Für die Untersuchung der Eindringung wurde getrocknetes Douglasienholz (u=14%) und Sugiholz (u=16%) sowie frisches japanisches Lärchenholz (u=45%) und Sugiholz (u=70%) imprägniert. Es zeigte sich, dass trockenes Sugiholz sowohl in axialer Richtung (170 mm) als auch in radialer Richtung (8 mm) an allen Messstellen die größte Einbringmenge aufwies, gefolgt von frischem Sugiholz, frischem japanischem Lärchenholz und trockenem Douglasienholz. Auf die Holzfeuchte bezogen, wies Sugiholz mit der niedrigsten Anfangsholzfeuchte unter identischen Imprägnierbedingungen die höchste Flüssigkeitsaufnahme (624 kg/m3) und den höchsten Imprägniergrad (max. 87 und 96% am Hirnholz und auf den Längsseiten) auf. Mit steigender Anfangsholzfeuchte nahm die Flüssigkeitsaufnahme und Eindringung in Sugiholz ab. Diese Ergebnisse könnten sich bei der Planung von Perforationsverfahren sowie bei Problemen im Zusammenhang mit hoher Anfangsholzfeuchte bei Tauchimprägnierung als hilfreich erweisen.

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Authors and Affiliations

  1. FWT Discipline, Khulna University, 9208, Khulna, Bangladesh

    Md. Nazrul Islam

  2. United Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, 183-8509, Tokyo, Japan

    Keisuke Ando & Nobuaki Hattori

  3. Institute of Wood Technology, Akita Prefectural University, 11-1 Kaieizaka, Noshiro, 016-0876, Akita, Japan

    Hidefumi Yamauchi

Authors
  1. Md. Nazrul Islam
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  2. Keisuke Ando
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  3. Hidefumi Yamauchi
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  4. Nobuaki Hattori
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Correspondence to Md. Nazrul Islam.

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Islam, M.N., Ando, K., Yamauchi, H. et al. Effects of species and moisture content on penetration of liquid in laser incised lumber by the passive impregnation method . Eur. J. Wood Prod. 67, 129–133 (2009). https://doi.org/10.1007/s00107-008-0292-y

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  • DOI: https://doi.org/10.1007/s00107-008-0292-y

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