CONTRIBUTION TO THE THEORY OF CELL COLLAPSE IN WOOD: INVESTIGATIONS WITH EUCALYPTUS REGNANS

Total collapse is considered as the sum of "liquid tension collapse" and "stress collapse". An equation is derived giving total collapse as a linear function of wood temperature and, to a smaller extent, of collapse-free shrinkage. The parameters of the equation depend only on su...

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Autor principal:	KAUMAN,W. G
Lenguaje:	English
Publicado:	Universidad del Bío-Bío 2002
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2002000100007
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spelling	oai:scielo:S0718-221X20020001000072007-03-22CONTRIBUTION TO THE THEORY OF CELL COLLAPSE IN WOOD: INVESTIGATIONS WITH EUCALYPTUS REGNANSKAUMAN,W. GTotal collapse is considered as the sum of "liquid tension collapse" and "stress collapse". An equation is derived giving total collapse as a linear function of wood temperature and, to a smaller extent, of collapse-free shrinkage. The parameters of the equation depend only on surface tension data and on structural and rheological properties of the wood. To test the theory, Eucalyptus regnans cubes of 7/8 in. edge length were dried at temperatures ranging from 70 to 285°F, using two levels of humidity at each temperature. In addition, specimens measuring 7/8 by 7/8 by 3 in. were dried at 150°F and low humidity. The results show good agreement with theoretical values for wood temperatures up to about 190°F. For higher temperatures or very low humidities collapse is found to be significantly time-dependent. Collapse in small end-sealed cubes is shown to be of the same order as that in the thickness of boards of rectangular cross section, but the latter collapse less in widthinfo:eu-repo/semantics/openAccessUniversidad del Bío-BíoMaderas. Ciencia y tecnología v.4 n.1 20022002-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2002000100007en10.4067/S0718-221X2002000100007
institution	Scielo Chile
collection	Scielo Chile
language	English
description	Total collapse is considered as the sum of "liquid tension collapse" and "stress collapse". An equation is derived giving total collapse as a linear function of wood temperature and, to a smaller extent, of collapse-free shrinkage. The parameters of the equation depend only on surface tension data and on structural and rheological properties of the wood. To test the theory, Eucalyptus regnans cubes of 7/8 in. edge length were dried at temperatures ranging from 70 to 285°F, using two levels of humidity at each temperature. In addition, specimens measuring 7/8 by 7/8 by 3 in. were dried at 150°F and low humidity. The results show good agreement with theoretical values for wood temperatures up to about 190°F. For higher temperatures or very low humidities collapse is found to be significantly time-dependent. Collapse in small end-sealed cubes is shown to be of the same order as that in the thickness of boards of rectangular cross section, but the latter collapse less in width
author	KAUMAN,W. G
spellingShingle	KAUMAN,W. G CONTRIBUTION TO THE THEORY OF CELL COLLAPSE IN WOOD: INVESTIGATIONS WITH EUCALYPTUS REGNANS
author_facet	KAUMAN,W. G
author_sort	KAUMAN,W. G
title	CONTRIBUTION TO THE THEORY OF CELL COLLAPSE IN WOOD: INVESTIGATIONS WITH EUCALYPTUS REGNANS
title_short	CONTRIBUTION TO THE THEORY OF CELL COLLAPSE IN WOOD: INVESTIGATIONS WITH EUCALYPTUS REGNANS
title_full	CONTRIBUTION TO THE THEORY OF CELL COLLAPSE IN WOOD: INVESTIGATIONS WITH EUCALYPTUS REGNANS
title_fullStr	CONTRIBUTION TO THE THEORY OF CELL COLLAPSE IN WOOD: INVESTIGATIONS WITH EUCALYPTUS REGNANS
title_full_unstemmed	CONTRIBUTION TO THE THEORY OF CELL COLLAPSE IN WOOD: INVESTIGATIONS WITH EUCALYPTUS REGNANS
title_sort	contribution to the theory of cell collapse in wood: investigations with eucalyptus regnans
publisher	Universidad del Bío-Bío
publishDate	2002
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2002000100007
work_keys_str_mv	AT kaumanwg contributiontothetheoryofcellcollapseinwoodinvestigationswitheucalyptusregnans
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CONTRIBUTION TO THE THEORY OF CELL COLLAPSE IN WOOD: INVESTIGATIONS WITH EUCALYPTUS REGNANS

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