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
156259, 156260, 156264, B32B 3100
Patent
active
047116897
DESCRIPTION:
BRIEF SUMMARY
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 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 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.
In one aspect the invention seeks to provide an improved process as above described and which permits a more economical use of bonding agent as used to bond the web strands together.
In accordance with this aspect of the invention there is provided a process as described above wherein said bonding is effected by use of a bonding agent and, prior to application of the bonding agent, the said web is subjected to a treatment in which its surface is coated with wax. Suitable waxes may be selected from the group comprising paraffin waxes but other waxes may be used.
In another aspect the invention seeks to improve the dimensional stability of the final product produced by the process of specification No. 510,845.
In this aspect, the invention contemplates effecting the compression step as in the process of Specification No. 510,845, by a first pressing causing application of compressive force in one direction transverse to the direction of extent of the grain of the web, at least partially releasing said compressive force, followed by a further pressing to effect compression either in said one direction or in a direction transverse thereto and also transverse to said direction of extent of the grain.
The invention is further described by way of example only with reference to the accompanying drawings in which:
FIG. 1 is a diagram showing steps in the process as described in Patent Specification No. 510,845 for forming a reconsolidated wood product;
FIG. 2 illustrates a method of adhesive application involving prior wax coating;
FIG. 3 is a diagram showing a variation of the process shown in FIG. 2; and
FIG. 4 is a diagram illustrating a preferred method of effecting compression of webs to form a reconsolidated wood product in accordance with this invention.
Referring firstly to FIG. 1, in the process of Australian Patent Specification No. 510,845 natural wood logs 10 are first partially broken down, being passed successively between rollers 12 of one or more roller pairs to induce cracking and thence progressively open up the log structure to form it into a web of loosely interconnected splinter-like strands (called "splinters" in Patent Specification No. 510,845). The resultant web, shown at 14 in FIG. 1, is of flexible open lattice work form, individual strands maintaining the original grain direction of the wood. Adhesive is then applied to the webs 14 such as by immersion in a suitable liquid adhesive in a bath 16 as shown. After removal of excess adhesive (by means not shown), a plurality of webs 14 are assembled together such that the individual webs in the assemblage are aligned in a common grain direction in a suitable mould 18. The assemblage of thus aligned webs is then consolidated in mould 18 such as by compression between the base of the mould
REFERENCES:
patent: 3325324 (1967-06-01), Schmidt
patent: 4112162 (1978-09-01), Casselbrant
patent: 4122236 (1978-10-01), Holman
patent: 4232067 (1980-11-01), Coleman
patent: 4273581 (1981-06-01), Inoue
patent: 4377649 (1983-03-01), Sweeney et al.
patent: 4396673 (1983-08-01), Ball et al.
Commonwealth Scientific and Industrial Research Organization
Spruill Robert L.
Weihrouch Steven P.
LandOfFree
Process for reconsolidated wood production does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for reconsolidated wood production, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for reconsolidated wood production will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-21613