Efeito da vaporização de toras na redução dos defeitos associados a tensões de crescimento de Eucalyptus grandis
The present study was carried out to evaluate log steaming effect on the reduction of defects associated with residual growth stress of Eucalyptus grandis wood. There were used logs with diameter of 20 to <25, 25 to <30 and 30 to <35 cm, from the Horto Florestal, Manduri, São Paulo. Half...
| Main Authors: | , |
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| Format: | Article |
| Language: | Portuguese |
| Published: |
Universidade Federal de Santa Maria
2005-01-01
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| Series: | Ciência Florestal |
| Online Access: | http://www.redalyc.org/articulo.oa?id=53415410 |
| Summary: | The present study was carried out to evaluate log steaming effect on the reduction of defects
associated with residual growth stress of Eucalyptus grandis wood. There were used logs with diameter of 20
to <25, 25 to <30 and 30 to <35 cm, from the Horto Florestal, Manduri, São Paulo. Half of the logs was
steamed during 20 hours at 90ºC of temperature and 100% of relative humidity. Subsequently, the logs were
live sawn and the defects resulting from the growth stresses in logs of various diameter were measured. The
results indicate that log steaming provided the release of a great part of the growth stresses, without
eliminating them completely, showing, nevertheless, that this treatment is feasible and advisable for growth
stress relief; the boards coming from heated logs of 20 to <25 cm presented, in general, larger defect
reduction, showing that the smaller the log diameter the higher the efficiency of steam treatment at 90ºC of
temperature during 20 hours. |
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| ISSN: | 0103-9954 1980-5098 |