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| Titel: |
THE HIGH-TEMPERATURE SEASONING OF SOFTWOOD BOARDS |
| Auteur: |
Keey, R. B. Shusheng, Pang |
| Verschenen in: |
Drying technology |
| Paginering: | Jaargang 12 (1994) nr. 6 pagina's 1297-1322 |
| Jaar: |
1994 |
| Inhoud: |
Pinus radiata, the commonest plantation-grown softwood in New Zealand, is increasingly dried in kilns under high-temperature conditions when the dry-bulb temperature exceeds100°C. The ease of drying depends upon the ways moisture can move through the boards, which differ in heartwood from those in sapwood. These considerations have led to a drying model which can describe the temperature and moisture-content variation of aboard as it dries. Local variations of the external mass-transfer coefficient (also incorporated in the model) have an influence which is greater as the air temperature is raised. Comparison with laboratory data on the drying of a single board give confidence in the applicability of the model. There are two principal stages in the drying process: an earlier one dominated by a receding front about the boiling point, and a later one in which cell-wall and vapour diffusion prevails. This suggests that two characteristic drying curves may correlate the behaviour of the drying board with a given thickness. This simplified model describes the results of the more detailed physical model adequately, and it can then be used as the basis for investigating kilnwide variations in moisture content and temperature and the impact of airflow reversals. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 169 van 180 gevonden artikelen
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