EP1510309A1 - Procédé de fabrication de bois lamellé collé - Google Patents

Procédé de fabrication de bois lamellé collé Download PDF

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Publication number
EP1510309A1
EP1510309A1 EP04292093A EP04292093A EP1510309A1 EP 1510309 A1 EP1510309 A1 EP 1510309A1 EP 04292093 A EP04292093 A EP 04292093A EP 04292093 A EP04292093 A EP 04292093A EP 1510309 A1 EP1510309 A1 EP 1510309A1
Authority
EP
European Patent Office
Prior art keywords
timber
laminated
making
wood
laminated wood
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04292093A
Other languages
German (de)
English (en)
Inventor
Alain Brunet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pinexel Inc
Original Assignee
Pinexel Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pinexel Inc filed Critical Pinexel Inc
Publication of EP1510309A1 publication Critical patent/EP1510309A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M3/00—Manufacture or reconditioning of specific semi-finished or finished articles
    • B27M3/0013—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles
    • B27M3/006—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles characterised by oblong elements connected both laterally and at their ends
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
    • B27M1/08—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by multi-step processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M3/00—Manufacture or reconditioning of specific semi-finished or finished articles
    • B27M3/0013—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles
    • B27M3/0026—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles characterised by oblong elements connected laterally
    • B27M3/0053—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles characterised by oblong elements connected laterally using glue

Definitions

  • the present invention relates to static wood structures. More particularly, the present invention relates to a method for making a laminated wood product.
  • Laminated wood beams are known to be stronger, more resistant and more dimensionally stable than continuous wood beams.
  • the fabrication of traditional laminated beams requires the use of wood members of dimensions and quality that have become increasingly harder to obtain due to the fact that nowadays the trees available are a lot smaller than they once were.
  • the wood members are often cut from trees of relatively small diameter, such as trees from plantation or northern forests, thereby producing members of low grade, small dimensions and with a high proportion of flash.
  • CA Patent Application No. 2,350,380 filed June 13, 2001 by Grenier presents a method for making a lamellated wood product of high mechanical properties from wood slats of uniform thickness.
  • the wood slats are bonded end to end to a desired length and edge bonded into a panel, the panel is cut into smaller panels of identical width, the small panels are face bonded to form a beam, the beam is cut to form smaller beams, and the small beams are cut into lamellated wood product.
  • This process requires numerous steps in order to obtain the final product.
  • the requirement of uniform thickness prevents the use of slats containing defects such as flash.
  • It yet another aim of the present invention to provide a method for making a laminated cross lumber beam that easily integrates the use of wood members containing flash.
  • a method for making a laminated cross lumber beam comprising the steps of:
  • a method for making a laminated wood timber from a plurality of elongated wood members comprising the steps of:
  • a laminated cross lumber beam or timber 10 is composed of a plurality of elongated wood pieces 11 bonded together face to face and side to side.
  • This laminated cross lumber beam 10 presents the advantages of superior mechanical and physical properties and a visual aspect similar to a standard laminated beam, while being produced using a simple method that can be further simplified by the use of small wood members as a starting material. The simplicity of the process minimizes fabrication costs.
  • the method used to produce this laminated cross lumber beam is described in the following.
  • the starting material for the method according to the present invention is a plurality of elongated wood members 12.
  • the wood members 12 include two longitudinal sides 14 and top and bottom wider longitudinal faces 16. Shown in Fig.2 are different examples of wood members 12 that can be used: integral members (Fig.2A), smaller members joined end to end through finger joints 18 or any other appropriate joints (Fig.2B), and members partially composed of flash 20 (Fig.2C).
  • the wood members 12 are preferably made of high density softwood such as black spruce or jack pine of low grade (no. 3 and/or economy). Of course, other types and grades of wood can be used, as needed.
  • the wood members also need to have an appropriate humidity content, for example between 12% and 15%.
  • Preferred dimensions for the wood members are a thickness (X1) of 0.75 to 2 inches, a width (Y) of 1.5 to 8 inches and a length (Z) of 6 inches to 20 feet, but of course any other appropriate dimensions can be used.
  • An optional preliminary step of evening the dimensions of the wood members 12 can be performed, for example by planing. This can be done to eliminate all or part of the variations in width and/or thickness within the wood members 12, thereby optimizing the adhesion between adjacent wood members 12 by increasing the surface of contact therebetween. This step also allows the removal of at least part of the flash 20 if so desired.
  • the wood members 12 are selected and/or transformed so as to obtain groups of wood members 12 of similar width (Y). Glue is then put on the longitudinal faces 16 of the wood members 12 of similar width (Y) before pressing them together face to face in order to form a beam 22 as shown in
  • the glue used is preferably a structural wood glue such as polyurethane (PUR), isocyanates, phenol-resorcinol-formaldehyde (PRF), resorcinol or any other appropriate adhesive.
  • a non-structural wood glue can be used, such as polyvinyl acetate (PVA), urea melamine (UM), urea formaldehyde (UF), or any other appropriate adhesive.
  • PVA polyvinyl acetate
  • UM urea melamine
  • UF formaldehyde
  • the thickness (X) of the beam 22 is the sum of the thicknesses (X1) of the wood members 12 used, whereas the width (Y) of the beam 22 is determined by the width of the widest wood member 12 used.
  • a step of planing the beam 22 can then be performed in order to obtain a more uniform width (Y). This can be done, for example, by longitudinally running the beam 22 through an edging station. This step also allows for removal of at least part of the flash 20 if so desired.
  • the beam 22 is then cut perpendicularly to the longitudinal faces 16 of the wood members 12 as shown in Fig.4. This will produce a number of panels 22a,b,c having a smaller width (Y') that can be, for example, between 0.5 and 4 inches. For beams 22 that have a small enough width (for example, 2 inches or less), this step can be omitted. Thus, the method of the invention can be simplified when the starting material is smaller.
  • the adhesive used can be the same as previously used or another appropriate adhesive.
  • the width (Yf) of the laminated cross lumber beam 10 is the sum of the widths (Y') of the panels used, whereas the height (X) of the laminated cross lumber beam 10 is determined by sum of the thicknesses (X1) of the wood members 12 used.
  • small beams that have not been cut into panels are assembled in a similar manner, and can be used alone or in combination with panels to form a laminated cross lumber beam 10.
  • the panels are selected so that adjacent panels come from different beams (see Fig.5 in conjunction with Fig.1).
  • a panel 24a from beam 24 is sandwiched between panels 22b and 22a from beam 22, panel 22a being also adjacent to a panel 26b from beam 26.
  • This distribution favors the discontinuity of wood fibers between the panels and optimizes the distribution of weakness points within the laminated cross lumber beam 10.
  • a better distribution of internal forces can be achieved, causing a low variability in mechanical properties between different laminated cross lumber beams 10.
  • Selecting the panels also allows to place panels with a better visual appearance to form the exterior surfaces 30, thereby improving the esthetic qualities of the laminated cross lumber beam 10.
  • the panels (here 22b and 22c) can be joined end to end, as shown in Fig.6.
  • the joint 32 is S-typed combined with an appropriate adhesive, but any other equivalent joint can be used.
  • joints are not aligned between assembled adjacent panels in the laminated cross section beam 10.
  • the described method presents several advantages, one of which, as stated above, being the fact that the use of smaller starting material simplifies the fabrication process by allowing the omission of a step, namely the cutting of the beams into panels.
  • this method allows for easy recuperation of scrap wood of small dimensions.
  • This method also allows the use of other scrap wood, such as wood members of non standard dimensions and wood members containing flash, either as is or after removing it completely or partially.
  • this method allows for the positioning of the panel pieces in the laminated cross lumber beam in order to maximize mechanical properties and esthetic appearance.
  • the laminated cross lumber beam has mechanical properties superior to the wood members composing it as well as a low variability of these properties between laminated cross lumber beams, namely because of wood fiber discontinuity and the distribution of weakness points brought by the cross lumber positioning of the panels. Finally, the laminated cross lumber beams produced by this method are produced rapidly in a minimum of steps, thus minimizing costs by diminishing handling, required equipment and workers, etc.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
EP04292093A 2003-08-29 2004-08-26 Procédé de fabrication de bois lamellé collé Withdrawn EP1510309A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA 2438632 CA2438632A1 (fr) 2003-08-29 2003-08-29 Element en bois lamelle a pli transversal et methode de reproduction
CA2438632 2003-08-29

Publications (1)

Publication Number Publication Date
EP1510309A1 true EP1510309A1 (fr) 2005-03-02

Family

ID=34085291

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04292093A Withdrawn EP1510309A1 (fr) 2003-08-29 2004-08-26 Procédé de fabrication de bois lamellé collé

Country Status (2)

Country Link
EP (1) EP1510309A1 (fr)
CA (1) CA2438632A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2842707A1 (fr) * 2013-08-26 2015-03-04 Ladenburger GmbH Poutre en bois lamellé collé et son procédé de fabrication

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4568577A (en) * 1982-01-04 1986-02-04 Fischetti David C Laminated timber structure for use as a stud, joist or post substitute
WO1998012030A1 (fr) * 1995-03-22 1998-03-26 Reijo Viljanen Procede de fabrication de panneaux de bois par collage et panneau de bois
US6446412B2 (en) * 2000-01-27 2002-09-10 Mathis Tech Inc. Glulam wood beams and method of making same
US20030010434A1 (en) * 2001-06-13 2003-01-16 Les Placements R. Grenier Inc. Process of making a lamellated wood product

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4568577A (en) * 1982-01-04 1986-02-04 Fischetti David C Laminated timber structure for use as a stud, joist or post substitute
WO1998012030A1 (fr) * 1995-03-22 1998-03-26 Reijo Viljanen Procede de fabrication de panneaux de bois par collage et panneau de bois
US6446412B2 (en) * 2000-01-27 2002-09-10 Mathis Tech Inc. Glulam wood beams and method of making same
US20030010434A1 (en) * 2001-06-13 2003-01-16 Les Placements R. Grenier Inc. Process of making a lamellated wood product

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2842707A1 (fr) * 2013-08-26 2015-03-04 Ladenburger GmbH Poutre en bois lamellé collé et son procédé de fabrication

Also Published As

Publication number Publication date
CA2438632A1 (fr) 2005-02-28

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