Log Quality – processing
Diameter and shape (sweep, taper, ovality) do not usually limit the kinds of processing systems which can be used. Sawing of logs is the most common processing method used.
Peeling and slicing and the manufacture of a range of reconstituted wood products are increasing in importance. Excellent results have been obtained with bandsaws, circular saws, frame saws and chipper canters in all the common sawmill configurations. New Zealand pine is similar to other medium-density softwoods in that more saw tooth side clearance is required than for hardwoods. A good surface finish can be achieved with appropriate feed speeds and sharp saws.
The full range of breakdown methods can be used with New Zealand pine and the conversion levels achieved are dependent on the log and product mix and the mill efficiency level. Cutting patterns are selected according to the machinery available, the log size and quality, and the products required.
Most traditional conversion patterns can be used with New Zealand pine, provided the quality zones are recognised.
Reference: NZ Pine User Guide, courtesy of NZ Pine Manufacturers Association