MEASUREMENT OF COLOUR DEVELOPMENT IN PINUS RADIATA SAPWOOD BOARDS DURING DRYING AT VARIOUS SCHEDULE

Colour changes, such as kiln brown stain, that develop in Pinus radiata boards during kiln drying can reduce the value of the final wood products and result in significant losses due to downgrade or waste of dried wood by removing the darkened surfaces. This study measured how colour developed in Pi...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	McCurdy,Murray, Pang,Shusheng, Keey,Roger
Lenguaje:	English
Publicado:	Universidad del Bío-Bío 2005
Materias:	drying schedules kiln brown stain Pinus radiata wood colour
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2005000200002
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:scielo:S0718-221X2005000200002
record_format	dspace
spelling	oai:scielo:S0718-221X20050002000022005-11-28MEASUREMENT OF COLOUR DEVELOPMENT IN PINUS RADIATA SAPWOOD BOARDS DURING DRYING AT VARIOUS SCHEDULEMcCurdy,MurrayPang,ShushengKeey,Roger drying schedules kiln brown stain Pinus radiata wood colour Colour changes, such as kiln brown stain, that develop in Pinus radiata boards during kiln drying can reduce the value of the final wood products and result in significant losses due to downgrade or waste of dried wood by removing the darkened surfaces. This study measured how colour developed in Pinus radiata sapwood boards under different drying schedules. The boards used in these experiments were 40×100×800mm, cut from the same log and were end- and edge-matched. Boards were dried at eight different schedules using temperatures from 50°C to 120°C and relative humidities from 14% to 67%. Separate boards were dried for 5 equal intervals through each schedule and colour profiles measured through the boards using a surface reflectance spectrophotometer. Lightness, L* on a greyscale was used as an indication of colour change (darkening). The results show that there is generally a greater decrease in lightness with higher temperature schedules and also with slower, higher relative humidity, schedules. This suggests that both temperature and drying time are significant factors in the formation of colour during drying. The most significant changes in colour occurred near the board surfaces, indicating kiln brown staininfo:eu-repo/semantics/openAccessUniversidad del Bío-BíoMaderas. Ciencia y tecnología v.7 n.2 20052005-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2005000200002en10.4067/S0718-221X2005000200002
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	drying schedules kiln brown stain Pinus radiata wood colour
spellingShingle	drying schedules kiln brown stain Pinus radiata wood colour McCurdy,Murray Pang,Shusheng Keey,Roger MEASUREMENT OF COLOUR DEVELOPMENT IN PINUS RADIATA SAPWOOD BOARDS DURING DRYING AT VARIOUS SCHEDULE
description	Colour changes, such as kiln brown stain, that develop in Pinus radiata boards during kiln drying can reduce the value of the final wood products and result in significant losses due to downgrade or waste of dried wood by removing the darkened surfaces. This study measured how colour developed in Pinus radiata sapwood boards under different drying schedules. The boards used in these experiments were 40×100×800mm, cut from the same log and were end- and edge-matched. Boards were dried at eight different schedules using temperatures from 50°C to 120°C and relative humidities from 14% to 67%. Separate boards were dried for 5 equal intervals through each schedule and colour profiles measured through the boards using a surface reflectance spectrophotometer. Lightness, L* on a greyscale was used as an indication of colour change (darkening). The results show that there is generally a greater decrease in lightness with higher temperature schedules and also with slower, higher relative humidity, schedules. This suggests that both temperature and drying time are significant factors in the formation of colour during drying. The most significant changes in colour occurred near the board surfaces, indicating kiln brown stain
author	McCurdy,Murray Pang,Shusheng Keey,Roger
author_facet	McCurdy,Murray Pang,Shusheng Keey,Roger
author_sort	McCurdy,Murray
title	MEASUREMENT OF COLOUR DEVELOPMENT IN PINUS RADIATA SAPWOOD BOARDS DURING DRYING AT VARIOUS SCHEDULE
title_short	MEASUREMENT OF COLOUR DEVELOPMENT IN PINUS RADIATA SAPWOOD BOARDS DURING DRYING AT VARIOUS SCHEDULE
title_full	MEASUREMENT OF COLOUR DEVELOPMENT IN PINUS RADIATA SAPWOOD BOARDS DURING DRYING AT VARIOUS SCHEDULE
title_fullStr	MEASUREMENT OF COLOUR DEVELOPMENT IN PINUS RADIATA SAPWOOD BOARDS DURING DRYING AT VARIOUS SCHEDULE
title_full_unstemmed	MEASUREMENT OF COLOUR DEVELOPMENT IN PINUS RADIATA SAPWOOD BOARDS DURING DRYING AT VARIOUS SCHEDULE
title_sort	measurement of colour development in pinus radiata sapwood boards during drying at various schedule
publisher	Universidad del Bío-Bío
publishDate	2005
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2005000200002
work_keys_str_mv	AT mccurdymurray measurementofcolourdevelopmentinpinusradiatasapwoodboardsduringdryingatvariousschedule AT pangshusheng measurementofcolourdevelopmentinpinusradiatasapwoodboardsduringdryingatvariousschedule AT keeyroger measurementofcolourdevelopmentinpinusradiatasapwoodboardsduringdryingatvariousschedule
_version_	1714202529462484992

MEASUREMENT OF COLOUR DEVELOPMENT IN PINUS RADIATA SAPWOOD BOARDS DURING DRYING AT VARIOUS SCHEDULE

Ejemplares similares