New Wood Dry Kiln

The wood drying kiln 8 itself may be constructed of any suitable material

. Preferably the wood drying kiln walls are constructed of a suitable metal such as a 16 gauge metal sheet, for example, and provided with insulation. The insulation employed is preferably mineral in nature although other known insulating material of appropriate heat resistance may be used if desired. In one form of construction that has been found suitable, the wood drying kiln is provided with external insulation comprising an aluminium clad fibreglass blanket attached to the exterior of the wood drying kiln. Preferably, the wood drying kiln is constructed of a number of individual modules in lateral cross-section. In this way any suitable number of individual modules may be placed end to end to provide a wood drying kiln of desired length for the timber to be treated. For example, in one suitable arrangement, ten modules placed face to face to provide a total wood drying kiln has been found satisfactory. Preferably each module includes a separate tube axial fan of the type above indicated and each providing an inlet and a return port for access to the inlet duct and return duct respectfully. Further details of the modular construction will be apparent from a study of the drawings annexed hereto.

Accordingly, the present invention provides a wood drying kiln 8 for the drying of timber. The wood drying kiln 8 of the present invention includes an elongated housing to provide a timber treatment zone. The elongated housing is provided by a wood drying kiln base 9, a pair of wood drying kiln side walls 10, 11 and a wood drying kiln top wall 12 defining the timber treatment zone 13 therewithin as far as the lateral cross-section is concerned. A pair of wood drying kiln end walls 14, 15 complete the timber treatment zone 13.

This invention relates to a wood drying kiln for drying timber and in particular Pinus radiata and to a method of operating a wood drying kiln. In the preparation of timber it is usual for green sawn timber to be placed into a wood drying kiln and heated. The objective is to remove moisture from the timber. If the temperature is low, the time taken to dry the timber sufficiently for commercial purposes is very high, correspondingly reducing the output of the wood drying kiln. If the dry bulk temperature is raised, say to 120 C., drying is more rapid and the output increases but problems arise in the timber. For example, there may be distortion of the timber possibly resulting from uneven drying. Cracks may appear at knots. Surface checking may occur and there may be an undesirable change in the colour of the timber.

by: ericfu

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