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...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Universidad del Bío-Bío
2005-01-01
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| Series: | Maderas: Ciencia y Tecnología |
| Subjects: | |
| Online Access: | http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2005000200002 |
| _version_ | 1811320077598851072 |
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| author | Murray McCurdy Shusheng Pang Roger Keey |
| author_facet | Murray McCurdy Shusheng Pang Roger Keey |
| author_sort | Murray McCurdy |
| collection | DOAJ |
| 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 |
| first_indexed | 2024-04-13T12:54:00Z |
| format | Article |
| id | doaj.art-8ee8ce8bdea649b98cc501729ec14fb9 |
| institution | Directory Open Access Journal |
| issn | 0717-3644 0718-221X |
| language | English |
| last_indexed | 2024-04-13T12:54:00Z |
| publishDate | 2005-01-01 |
| publisher | Universidad del Bío-Bío |
| record_format | Article |
| series | Maderas: Ciencia y Tecnología |
| spelling | doaj.art-8ee8ce8bdea649b98cc501729ec14fb92022-12-22T02:46:07ZengUniversidad del Bío-BíoMaderas: Ciencia y Tecnología0717-36440718-221X2005-01-01727986MEASUREMENT OF COLOUR DEVELOPMENT IN PINUS RADIATA SAPWOOD BOARDS DURING DRYING AT VARIOUS SCHEDULEMurray McCurdyShusheng PangRoger KeeyColour 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 stainhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2005000200002drying scheduleskiln brown stainPinus radiatawood colour |
| spellingShingle | Murray McCurdy Shusheng Pang Roger Keey MEASUREMENT OF COLOUR DEVELOPMENT IN PINUS RADIATA SAPWOOD BOARDS DURING DRYING AT VARIOUS SCHEDULE Maderas: Ciencia y Tecnología drying schedules kiln brown stain Pinus radiata wood colour |
| title | 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_short | 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 |
| topic | drying schedules kiln brown stain Pinus radiata wood colour |
| url | http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2005000200002 |
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