||Technology in Australia 1788-1988
Table of Contents
I Management Of Native Forests
II Plantations-high Productivity Resources
III Protecting The Resource
IV Harvesting The Resource
V Solid Wood And Its Processing
VI Minor Forest Products
VII Reconstituted Wood Products
i Veneer, plywood and laminated sections
VIII Pulp And Paper
IX Export Woodchips
X Future Directions
ParticleboardParticleboard manufacture was developed in Germany in the late 1940s and introduced to Australia in 1957 when Coreboard Ltd. (later purchased by Softwood Holdings Ltd.) established a plant at Mt. Gambier, S.A.. It used radiata pine thinnings and saw-log tops, for which there was little alternative use. After bark removal the logs were converted into thin flakes which were dried, mixed with urea-formaldehyde resin and then continuously extruded through a heated die. A second plant, built at Oberon, NSW by Pyneboard Pty. Ltd. (a subsidiary of CSR) in 1960, used an improved process which formed the board on an endless steel wire mesh, cut it into lengths and then pressed it between heated platens. In this product the flakes were aligned in the plane of the board, giving better tensile and bending strength in that plane compared with the extruded board, in which the flakes were oriented at right angles to it. Later plants used substantially the same process, although the endless wire mesh was replaced by a flexible steel belt.
The expanding economy of the 1960s, the increasing availability of suitable raw material and the high acceptability of the product led to more new plants and a very high annual growth rate, some of it at the expense of hardboard and plywood. In the 1970s this tapered off as building industry activity slackened but new plants continued to be built, so that by 1978 capacity utilization was down to about 60 per cent. Currently there are 14 plants in operation, the last two to be built -Softwood Holdings Ltd. at Portland, Vic. and Westralian Forest Industries Ltd. at Bunbury, WA -being large by world standards.
The industry has been innovative in raw material, process and product, principally by adapting overseas developments to local conditions. It has made extensive use of sawmill residues, which now amount to over 50 per cent of its raw material. While multi-daylight pressing has been normal practice, single-daylight pressing, with the sheet carried on an endless belt, was introduced by Softwood Holdings at a new plant in Mt. Gambier in 1981 to make sheets up to 20 m long.
Wood-veneered particleboard was first introduced in 1961, by Westralian Forest Industries. In the early 1970s particleboard surfaced with plastic laminates was introduced and in the mid-1970s, after much joint development with resin suppliers and CSIRO Division of Building Research, a flooring grade was developed using water-resistant phenol- or tannin-formaldehyde resin. This led to other potential structural applications which were explored by the industry with help from the Wood Technology Division of the NSW Forestry Commission and the Capricornia Institute of Advanced Education.
Oriented strand board (OSB), a particleboard variant in which somewhat elongated particles are used and oriented to increase longitudinal strength, has very recently been introduced by Pyneboard at their Tumut, NSW plant. The process has been in use overseas for some years where it competes with structural plywood.
The particleboard industry has become an important factor in the overall economics of softwood plantation forestry because of its use of thinnings, tops and sawmill residues. It has also reduced the demand for solid wood and plywood, although its expected market penetration in flooring and general structure use does not yet appear to have been achieved.
Organisations in Australian Science at Work - Capricornia Institute of Advanced Education; CSIRO Division of Building Research; N.S.W. Forestry Commission; Pyneboard Pty Ltd; Repco Corporation Ltd; Softwood Holdings Ltd; South Australian Timber Corporation; Westralian Forest Industries Ltd
People in Bright Sparcs - Coleman, J. D.
© 1988 Print Edition pages 231 - 232, Online Edition 2000
Published by Australian Science and Technology Heritage Centre, using the Web Academic Resource Publisher