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Collapse and internal checking in the latewood of Eucalyptus regnans F Muell

journal contribution
posted on 2023-05-16, 10:20 authored by Innes, TC
Tangential shrinkage was measured on longitudinal-tangential slices of separate earlywood and latewood from one board of Eucalyptus regnaw F.Muell. at various temperatures. Large amounts of collapse shrinkage were measured in the latewood slices, and lesser amounts in the earlywood slices. Collapse shrinkage in the earlywood was found only when the slices were dried at temperatures above a minimum temperature (the "collapse threshold temperature"). End-coated board sections approximately 200 mm long were rapidly dried at dry-bulb temperatures below the collapse threshold temperature for earlywood. Incipient internal checks were found in the latewood of these boards. Board sections dried at higher temperatures showed internal checks starting in both early and latewood. A non-linear drying simulation model was modified to take the heterogeneous nature of wood into account. This model predicted that internal checks would form in this wood even if it were dried sufficiently slowly to avoid surface checking.

History

Publication title

Wood Science and Technology

Volume

30

Issue

6

Pagination

373-383

ISSN

0043-7719

Department/School

School of Engineering

Publisher

Springer-Verlag

Place of publication

Germany

Repository Status

  • Restricted

Socio-economic Objectives

Wood, wood products and paper not elsewhere classified

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