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| Format: | Artículo científico |
| Language: | en |
| Published: |
Universidad del Bío Bío
2005
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| Online Access: | https://www.redalyc.org/articulo.oa?id=48570201 |
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Table of Contents:
- Industrial evaluation of re-dry strategy for softwood lumber Diego Elustondo Stavros Avramidis Luiz Oliveira Agrociencias re radio lumber drying modeling This paper presents an experimental evaluation of the first commercial scale dry-sort-redry (DSRD)strategy for drying of 2x4 Pacific coast hemlock (PCH) lumber. The DSRD strategy is a methodologydesigned to reduce final moisture content variability in kiln dried lumber by complementing conventionaldrying with radio frequency vacuum (RFV) drying technology. The strategys objective is to avoidproducing over-dried lumber in conventional drying by setting the target moisture content to a valuemuch higher than those usually used in industry. Then, RFV drying technology is implemented toquickly and efficiently re-dry the lumber that remains wet (under-dried) after the first conventionalpass. Six experimental tests were performed in an industrial sawmill with the intention of studying theeffect of target moisture content on the properties and quality of the dried lumber. In all cases, the firstdrying pass was performed in a 260m3 industrial heat-and-vent conventional kiln, and the re-drying ofwets was performed in a 75m3 RFV kiln. Additionally, a mathematical model developed for predictionof data dispersion in lumber drying was calibrated with experimental data, and used to simulate theDSRD strategy under other hypothetical conditions. The results of the study demonstrate that theDSRD strategy reduces drying time, shrinkage and kiln drying degrade in comparison with a singleconventional pass. 2005 artículo científico 0717-3644 https://www.redalyc.org/articulo.oa?id=48570201 en http://www.redalyc.org/revista.oa?id=485 Maderas. Ciencia y Tecnología application/pdf Universidad del Bío Bío Maderas. Ciencia y Tecnología (Chile) Num.2 Vol.7