Stock material or miscellaneous articles – Structurally defined web or sheet – Including grain – strips – or filamentary elements in...
Patent
1985-07-23
1987-11-03
Ives, P. C.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including grain, strips, or filamentary elements in...
428 15, 428 17, 428107, 428113, 428114, 428 88, 428 89, 428109, 428110, 4285371, 428284, 156177, 156178, 156180, B32B 512, B29J 504, B27L 1108
Patent
active
047043164
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a reconsolidated wood product and to a process for forming a reconsolidated wood product.
The Coleman U.S. Pat. No. 4,232,067 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 in a compression direction transverse to said grain direction whilst substantially maintaining the wood strands aligned along same 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 from a flexible open lattice work web of naturally interconnected wood strands, said web being formed by partially rending natural wood so that said strands are generally aligned along a common grain direction, a substantial proportion of said strands being substantially discrete but incompletely separated from each other, said process comprising compressing the web in a compression direction transverse to said grain direction 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.
SUMMARY OF THE INVENTION
An object of the invention is to provide a process and product as above described in which webs are laid-in in a fashion facilitating density control in the end product.
In one aspect of the present invention, there is provided a reconsolidated wood product as described above wherein said web comprises one of a plurality of overlaid like webs which are consolidated by said compression whilst being substantially maintained with said wood splinters or strands aligned along the respective common grain directions and bonded together by said bonding to hold them in the juxtapositions assumed pursuant to said consolidation, and wherein said webs are arranged along the length of said product so that opposite ends of the webs are closest to respective opposed surfaces of the said product, the webs being arranged at an acute angle to each of said surfaces, said surfaces being transverse to said compression direction. Where the surfaces are generally parallel, it is preferred that the webs make an angle less than 5.degree. to the said surfaces.
The invention also provides a process as described above wherein said web comprises one of a number of like webs which are together compressed to effect said consolidation and which are together bonded by said bonding, the webs being overlaid one upon the other in such a fashion that in the finished said product, the webs are arrayed in side-by-side relationship along the length of the product and are positioned so that opposite ends of the webs are closest to respective opposed surfaces of the product, the webs being arranged at an acute angle to both of those surfaces. Preferably, the said acute angle is less than 5.degree.. Preferably said webs are cut to common lengths prior to said compression.
Where said webs are formed from natural wood products such as logs, exhibiting a taper from one end to the other, said webs exhibit a decrease in mass per unit length from one end to the other. In one embodiment of the present invention, the said webs, although having a common grain direction as described are arranged so that there are substantially equal numbers of said webs having their ends of greater mass per unit length located towards one said surface and located towards the other said surface respectively. For example alternate webs may have the ends of greater mass per unit length located towards one said surface, the remainder having the ends of greater mass per unit length located towards the other said surface. In many instances, ho
REFERENCES:
patent: 3493021 (1970-02-01), Champigny
patent: 4061819 (1977-12-01), Barnes
patent: 4232067 (1980-11-01), Coleman
patent: 4355754 (1982-10-01), Lund et al.
patent: 4388133 (1983-06-01), Hirao et al.
patent: 4508772 (1985-04-01), Churchland
Ives P. C.
Repco Limited
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