Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1985-07-23
1987-12-08
Spruill, Robert L.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156260, 156264, 156296, 241205, 241206, B32B 3100
Patent
active
047116846
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an improved method and apparatus for use in producing reconsolidated wood products.
Our Australian Patent Specification No. 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 above 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 rolling 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.
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 rolling the natural wood between a pair of rollers, arranged with generally parallel axes, so as to rollingly engage the natural wood from either side, whilst causing repetitive back and forth movements of one said roller relative to the other, said movements being generally parallel to the axes of the 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 wherein the apparatus comprises a pair of spaced generally parallel axially rotatable rollers and means for effecting repetitive relative back and forth movements of one said roller relative to the other, said movements being generally parallel to the axes of the rollers. Normally, said means is arranged to axially move one of the rollers, the other being substantially fixed axially, but said means may also be arranged to axially move both rollers. In any event the apparatus may be arranged such that the rate of said movement may be varied depending on the surface speed of the rollers occurring in use due to the rotation of the rollers, or on the size and quality of the natural wood, or on the extent to which the wood passing between said rollers has been previously reduced to a flexible open lattice work web. Usually, too, at least one of the rollers is rotationally driven and both rollers may, if desired, be so driven. One or both said rollers may have a series of peripheral grooves extending in planes generally transverse to the d
REFERENCES:
patent: 773479 (1904-10-01), Cornell
patent: 4232067 (1980-11-01), Coleman
Commonwealth Scientific and Industrial Research Organization
Spruill Robert L.
Weihrouch Steven P.
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