Recovery of Collapse in <i>Eucalyptus Delegatensis</i> by use of Anhydrous Ammonia and Steam

Authors

  • J. F. G. Mackay

Abstract

Eurcalyptus delegatensis wood dried to 5, 12, and 18% moisture content was treated with steam and anhydrous ammonia to recover collapse. Steam or ammonia gave similar results in terms of the optimum treating moisture content, viz. 12%, but steaming was the more effective at other levels. Ammonia swells collapsed wood considerably, but only part of this "recovery" is permanent. At the lowest moisture content, further shrinkage may occur.

References

Anon. 1963. Collapse and the reconditioning of collapsed timber. Timber Seasoning Correspondence Course, Lesson No. 8, CSIRO, Division of Forest Products, Melbourne.nDavidson, R. W., and W. G. Baumgardt. 1970. Plasticising wood with ammonia—a progress report. For. Prod. J., 20 (3): 19-25.nGreenhill, W. L. 1938. Collapse and its removal: some recent investigations with Eucalyptus regnans. CSIRO (Aust.), Pamphlet No. 75nGreenhill, W. L. 1940. Collapse and its removal. Aust. Timber J. 6: 160-171, 228-241.nHart, C. A. 1970. Water-filled lumens in steady-state flow in oak and poplar. Wood and Fiber 1 (4): 308-318.nKubler, H. 1970. A note on recovery of excessive shrinkage in wood. Wood Sci. 3 (1): 62-64.nParham, R. A., R. W. Davidson, and C. H. de Zeeuw. 1972. Radial-tangential shrinkage of ammonia-treated loblolly pine wood. Wood Sci. 4 (3): 129-136.nPentoney, R. W. 1966. Liquid ammonia-solvent combinations in wood plasticization. I. and E. C. Prod. Res. Dev. 5 (2): 105-110.n

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Published

2007-06-05

Issue

Number 3 / Fall 1972

Section

Research Contributions

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