
Plantation forestry has developed rapidly in New Zealand. In 50 years, the country's industrial wood supply has changed almost completely from natural forests to managed forest plantations, thus emphasising New Zealand Pine as the primary species.
Extensive research and experience in plantation forestry has provided a good understanding of how New Zealand pine log quality can be influenced by genetic selection, silviculture and the method of conversion.
New Zealand pine has unique properties among softwood species, in that total treatment of sapwood is always achievable. It is very amenable to manipulation of preservative treatment processes, which are environmentally acceptable and give a reliable standard of treatment.
New Zealand pine sawn lumber is a versatile structural building material which is well suited to the 2 x 4 building system. It is used equally successfully in larger buildings as glue-laminated lumber and for many other structural applications.
New lamination and finger-jointing technologies are increasing the use of New Zealand pine in a wide range of products - from small mouldings to huge engineered beams. New Zealand pine is being successfully used for a wide range of interior fittings and fixtures, including: windows, doors, frames and jambs, mouldings, stairs, cabinetry and bench tops.
Qualities
Texture & Appearance
One of its unique properties is its uniform density, i.e. the small variation
in density between spring wood and summer wood within a growth ring. It is this
property which confers on New Zealand pine its excellent machining, painting
and staining properties.
Consisting mainly of white sapwood, with prominent fine resin canals, it presents
a uniform appearance with little colour variation between pieces. This is an
advantage for subsequent finishing.
|
| Last Updated on Tuesday, 17 February 2009 23:41 |
Machining
Comprehensive tests undertaken have shown that New Zealand pine has machining
properties (cross-cutting, turning, planing, moulding, boring, sanding) equal
to or superior to many of the internationally traded softwoods. Its fast growth
does not adversely affect its working properties and good results can be obtained
with all types of hand and machine tools.
|
| Last Updated on Tuesday, 17 February 2009 23:41 |
Finishing
The full range of interior and exterior stains, oils, varnishes and paints may
be used on New Zealand pine. The absence of high concentrations of extractives
prevents any incompatibility with finishes and eliminates the need for special
primers. A very high standard of finishing can be obtained. The wood can be
stained to resemble a wide range of traditional timber species.
|
| Last Updated on Tuesday, 17 February 2009 23:41 |
Fastening
Being of medium density and even texture and having a good resistance to splitting,
New Zealand pine can be nailed particularly well. The same properties allow
the production of efficient joints using other systems, e.g. screws and proprietary
connections.
Low extractives content and uniform density allow achievement of above-average
glued connections e.g. dowels and finger-joints. The high strength of glues
dowel joints is due to the contribution from the end grain to the joint.
|
| Last Updated on Tuesday, 17 February 2009 23:41 |
Dimensional Stability
This is a crucial wood property for interior fittings and joinery uses. New
Zealand pine has a low shrinkage which contributes to its stability. However,
stability is also affected by a number of other properties, including: equilibrium
moisture content, straightness of grain, spiral grain, rate of moisture uptake,
permeability to liquids and gases.
Long term movement is the property which best describes the dimension changes
which occur when joinery is exposed to dry summer conditions and later to wet
winter conditions. The dimensional response of cladding and joinery when exposed
to fluctuating weather conditions, such as alternating rain wetting and sunshine,
is best described as short-term movement.
Because of the presence of spiral grain, the juvenile wood of New Zealand pine
should not be used where stability is vital to performance. Dimensional performance
can be increased by use of finger-jointing, and/or lamination.
Such highly processed laminated, finger-jointed clear products are used widely
in Japan where a maximum stability is required.
|
| Last Updated on Tuesday, 17 February 2009 23:42 |
Durability
New Zealand pine must be preservative-treated for exterior uses. However, it
is one of the most permeable wood species and can, therefore, be acceptably
treated by pressure impregnation, double vacuum and simple immersion methods.
LOSP treatments are very successful for joinery.
Preservative treatment to the strict hazard class specifications, allow the New
Zealand industry to give service life guarantees for external use products. A
number of properties of New Zealand pine contribute to the ready acceptance for
these products.
|
| Last Updated on Tuesday, 17 February 2009 23:42 |
Wood Bending
A process developed to bend solid pine timber and MDF to the consistent requirements
of furniture manufacturers, thus creating an entire range of design possibilities.
The Woodform process is both cost and time effective for the manufacturing
of existing products, and it creates the potential for more inspired, imaginative
furniture design and production; options previously uneconomic now achieve maximum
value added potential.
|
| Last Updated on Tuesday, 17 February 2009 23:42 |