The Effect of Steaming Time and Temperature on the Longitudinal Permeability of Black Walnut

Authors

  • Peter Y. S. Chen

Keywords:

Juglans nigra, heartwood, sapwood, treatments

Abstract

Longitudinal permeability to water of black walnut sapwood and heartwood specimen plugs was determined before and after steam treatments for 1, 2, 3, and 4 h and two temperatures (100 C and 115 C). Steaming heartwood specimens at 115 C gave three times greater increase in longitudinal permeability than steaming at 100 C. Also, steaming heartwood specimens at 115 C for 4 h gave the greatest and most significant increase (560%) in longitudinal permeability of all other steaming times (which averaged about 90% increase). However, steam treatment caused very little change in longitudinal permeability of sapwood.

Steaming at 100 C for 4 h reduced the ratio of longitudinal permeability of sapwood to heartwood from 24,000 to approximately 10,000. Steaming at 115 C for 4 h reduced this ratio to about 4,000.

References

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Published

2007-06-05

Issue

Number 3 / Fall 1975

Section

Research Contributions

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