Woodworking – Process – Mechanical cutting or shaping
Patent
1990-12-31
1992-11-10
Bray, W. Donald
Woodworking
Process
Mechanical cutting or shaping
144 2R, 156256, 156264, B27M 102
Patent
active
051615916
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an improved method and apparatus for use in producing reconsolidated wood products.
Australian Patent Specification 510,845 describes a reconsolidated wood product formed from at least one flexible open lattice work web of naturally interconnected wood strands generally aligned along a common grain direction, a substantial proportion of said strands being substantially discrete but incompletely separated from each other; said web having been consolidated by compression whilst substantially maintaining the wood strands aligned along said common grain direction and said strands being bonded together to hold them in juxtapositions assumed pursuant to said consolidation.
That patent specification also describes a process for forming a reconsolidated wood product, the process comprising the steps of partially rending natural wood to form a flexible open lattice work web of naturally interconnected wood strands which are generally aligned along a common grain direction, a substantial proportion of said strands being substantially discrete but incompletely separated from each other, compressing the web to consolidate the strands whilst maintaining them such as to substantially extend in said original grain direction and bonding said strands together to hold them in juxtapositions assumed pursuant to said consolidation.
The process described in Australian Patent Specification 510,845 (whose disclosure is incorporated herein by reference) has been found to be generally quite satisfactory. However, the quality of the resultant product is influenced by the quality of the webs used to form the product. In particular, an even web having homogeneously partially separated strands is required for best results. When plane rolling alone is employed to produce the webs, the webs may not always be adequately "teased-out", possibly having portions where individual strands are still relatively tightly bundled together, and other portions where the strands are widely separated. Also, there may be a tendency to break an excessive number of individual strands during rolling, thereby weakening the wood structure unnecessarily.
The invention seeks to provide a process and apparatus which facilitates production of good quality webs and reconsolidated wood products.
The invention provides a process for partially rending natural wood to form a flexible open lattice work web of naturally interconnected wood strands which are generally aligned along a common grain direction, a substantial proportion of said strands being substantially discrete but incompletely separated from each other, said rending being effected by crushing the natural wood between a pair of rollers arranged with generally parallel axes by rollingly engaging the natural wood from either side to form an open carcase of the natural wood and by spreading and refining the carcase to form the web, said spreading and refining comprising passing the crushed carcase through at least two roller pairs which have spaced corrugated rollers and in which the maximum spacing between the corrugations of the opposed spaced corrugated rollers decreases in the roller pairs with increasing distance along a spreading and refining path from the crushing rollers, reciprocating at least one roller of each spaced corrugated roller pair relative to the other roller of said pair during said pass, and passing the carcase through a pair of intermeshing corrugated rollers after said pass through a first of the pairs of spaced corrugated rollers and before said pass through a further of the pairs of spaced corrugated rollers.
The invention also provides apparatus for rending natural wood to form natural wood into a flexible open lattice work web of substantially parallel aligned naturally interconnected strands, the apparatus comprising a pair of spaced generally parallel axially rotatable crushing rollers, at least two roller pairs downstream of the crushing roller pair each comprising a pair of spaced generally parallel axially rotatable corrugated rollers of which at lea
REFERENCES:
patent: 3674219 (1972-07-01), Harvey, Jr.
patent: 4672006 (1987-06-01), McGraw
patent: 4695345 (1987-09-01), Grace
Campbell Maxwell G.
Sealey Robin D.
Bray W. Donald
South Australian Timber Corporation
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