| Автор | Chadwick, W. B. |
| Автор | Langrish, T. A. G. |
| Дата выпуска | 1996 |
| dc.description | ABSTRACTContinuous- and cyclic-dryins experiments have been carried out on an Australian hardwood timber; tuipentine. to compare the drying timesand the final quality of the timberproduced by these techniques. More severe drying conditions have been used in the the active drying Periods for cvclic drvins than for continuous drvins in order to hchieve similar drying Cimis. Fourteen boards of approximate original dimension 45 mm wide by 25 mm thick by 750 mm long, sealed at each end using an epoxy mastic coating, have been dried in each experiment. with end-matched samples being used to reduce the effect of different growing locations. The two cyclic-drying experiments differed in the use of high-humidity conditions in the relaxation period for the first experiment and ambient conditions in the relaxation period for the second experiment.The total drying time for the second cyclic-drying experiment was equal to that for continuous drying, while the drying time for the first cyclic-drying experiment was 20% less than that for continuous drying. There were no significant differences at the 95% confidence level inbow, spring, shrinkageor surfacechecking between end-matched samples for continuous or cyclic drying. mist was significantly greater for the first cyclic-drying experiment. Collapse was virtually eliminated in both cyclic-drying experiments, while the internal checkina produced bv cyclic drvino was finer than that produced by continuous drying. the ; total number of internal checks observed in the first cyclic-drying experiment 1138) was 80% greater than that produced by continuous djing (761, while the number of checks found from the second cyclic-drying experiment (69) was 10% less than the number from continuous drvino. The imoroved performance of the second cyclic-drying experiment was not expected, since the use of high-humidity conditions would be expected to give higher diffusion coefficients and therefore more even moistu- re-content gradients, as well as less thermal shock at the start of are also due to Mr W. Mc Phee of Australian Heavy Hardwoods Pty Ltd for supplying the timber. This work has also been supported by the Australian Research Council, the Ian Potter and George Alexander Foundations, and The University of Sydney Research Grant Scheme. |
| Формат | application.pdf |
| Издатель | Taylor & Francis Group |
| Копирайт | Copyright Taylor and Francis Group, LLC |
| Тема | cyclic conditions |
| Тема | drying time |
| Тема | hardwood |
| Тема | timber quality |
| Название | A Comparison of Drying Time and Timber Quality in the Contihuous and Cyclic Drying of Australian Turpentine Timber |
| Тип | research-article |
| DOI | 10.1080/07373939608917130 |
| Electronic ISSN | 1532-2300 |
| Print ISSN | 0737-3937 |
| Журнал | Drying Technology |
| Том | 14 |
| Первая страница | 895 |
| Последняя страница | 906 |
| Аффилиация | Chadwick, W. B.; Department of Chemical Engineering, University of Sydney, N.S.W 2006 |
| Аффилиация | Langrish, T. A. G.; Department of Chemical Engineering, University of Sydney, N.S.W 2006 |
| Выпуск | 3-4 |
