TECHNIQUES TO MONITOR DRYING STRESSES AND DIMENSIONAL CHANGES IN TIMBER FROM PLANTATION-GROWN EUCALYPTS FOR KILN SCHEDULE DEVELOPMENT AND KILN CONTROL

Drying tests were conducted with timber from 13 year-old plantation-grown Eucalyptus nitens and E. globulus, to determine shrinkage and drying degrade of tangential- and radial-sawn boards. The eucalypt species investigated exhibited a high level of collapse which was difficult to distinguish from n...

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Autor principal:	Northway,R.L.
Lenguaje:	English
Publicado:	Universidad del Bío-Bío 2002
Materias:	drying shrinkage drying degrade drying stress kiln drying kiln controls eucalyptus
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2002000200005
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spelling	oai:scielo:S0718-221X20020002000052006-12-13TECHNIQUES TO MONITOR DRYING STRESSES AND DIMENSIONAL CHANGES IN TIMBER FROM PLANTATION-GROWN EUCALYPTS FOR KILN SCHEDULE DEVELOPMENT AND KILN CONTROLNorthway,R.L. drying shrinkage drying degrade drying stress kiln drying kiln controls eucalyptus Drying tests were conducted with timber from 13 year-old plantation-grown Eucalyptus nitens and E. globulus, to determine shrinkage and drying degrade of tangential- and radial-sawn boards. The eucalypt species investigated exhibited a high level of collapse which was difficult to distinguish from normal shrinkage and confounded the results. Nevertheless some useful conclusions about the potential for these techniques to indicate drying stress in plantation grown Eucalyptus were drawn from the qualitative work undertaken: Cup measurements on a half-thickness board, sealed on one face, provided a qualitative indication of stress reversal. This was confirmed with stress prongs. Width of an artificial check did not provide a useful indication of the development of stress. Transverse surface shrinkage measured across specimens and across a fixed core did not provide a useful indication of the development of stress. Cup measurements and stress prongs indicated transverse strains at the surface while surface moisture content was still above fibre-saturation. Non-contact measurement of shape change during drying showed some potential for indicating drying stress but needs higher resolution scanning and special image analysis techniques to be developed. Optical profiling and image analysis may be useful in the development of a kiln control system based on material behaviourinfo:eu-repo/semantics/openAccessUniversidad del Bío-BíoMaderas. Ciencia y tecnología v.4 n.2 20022002-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2002000200005en10.4067/S0718-221X2002000200005
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	drying shrinkage drying degrade drying stress kiln drying kiln controls eucalyptus
spellingShingle	drying shrinkage drying degrade drying stress kiln drying kiln controls eucalyptus Northway,R.L. TECHNIQUES TO MONITOR DRYING STRESSES AND DIMENSIONAL CHANGES IN TIMBER FROM PLANTATION-GROWN EUCALYPTS FOR KILN SCHEDULE DEVELOPMENT AND KILN CONTROL
description	Drying tests were conducted with timber from 13 year-old plantation-grown Eucalyptus nitens and E. globulus, to determine shrinkage and drying degrade of tangential- and radial-sawn boards. The eucalypt species investigated exhibited a high level of collapse which was difficult to distinguish from normal shrinkage and confounded the results. Nevertheless some useful conclusions about the potential for these techniques to indicate drying stress in plantation grown Eucalyptus were drawn from the qualitative work undertaken: Cup measurements on a half-thickness board, sealed on one face, provided a qualitative indication of stress reversal. This was confirmed with stress prongs. Width of an artificial check did not provide a useful indication of the development of stress. Transverse surface shrinkage measured across specimens and across a fixed core did not provide a useful indication of the development of stress. Cup measurements and stress prongs indicated transverse strains at the surface while surface moisture content was still above fibre-saturation. Non-contact measurement of shape change during drying showed some potential for indicating drying stress but needs higher resolution scanning and special image analysis techniques to be developed. Optical profiling and image analysis may be useful in the development of a kiln control system based on material behaviour
author	Northway,R.L.
author_facet	Northway,R.L.
author_sort	Northway,R.L.
title	TECHNIQUES TO MONITOR DRYING STRESSES AND DIMENSIONAL CHANGES IN TIMBER FROM PLANTATION-GROWN EUCALYPTS FOR KILN SCHEDULE DEVELOPMENT AND KILN CONTROL
title_short	TECHNIQUES TO MONITOR DRYING STRESSES AND DIMENSIONAL CHANGES IN TIMBER FROM PLANTATION-GROWN EUCALYPTS FOR KILN SCHEDULE DEVELOPMENT AND KILN CONTROL
title_full	TECHNIQUES TO MONITOR DRYING STRESSES AND DIMENSIONAL CHANGES IN TIMBER FROM PLANTATION-GROWN EUCALYPTS FOR KILN SCHEDULE DEVELOPMENT AND KILN CONTROL
title_fullStr	TECHNIQUES TO MONITOR DRYING STRESSES AND DIMENSIONAL CHANGES IN TIMBER FROM PLANTATION-GROWN EUCALYPTS FOR KILN SCHEDULE DEVELOPMENT AND KILN CONTROL
title_full_unstemmed	TECHNIQUES TO MONITOR DRYING STRESSES AND DIMENSIONAL CHANGES IN TIMBER FROM PLANTATION-GROWN EUCALYPTS FOR KILN SCHEDULE DEVELOPMENT AND KILN CONTROL
title_sort	techniques to monitor drying stresses and dimensional changes in timber from plantation-grown eucalypts for kiln schedule development and kiln control
publisher	Universidad del Bío-Bío
publishDate	2002
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2002000200005
work_keys_str_mv	AT northwayrl techniquestomonitordryingstressesanddimensionalchangesintimberfromplantationgrowneucalyptsforkilnscheduledevelopmentandkilncontrol
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TECHNIQUES TO MONITOR DRYING STRESSES AND DIMENSIONAL CHANGES IN TIMBER FROM PLANTATION-GROWN EUCALYPTS FOR KILN SCHEDULE DEVELOPMENT AND KILN CONTROL

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