WO2001049483A1 - Element structurel leger - Google Patents

Element structurel leger Download PDF

Info

Publication number
WO2001049483A1
WO2001049483A1 PCT/US2001/000502 US0100502W WO0149483A1 WO 2001049483 A1 WO2001049483 A1 WO 2001049483A1 US 0100502 W US0100502 W US 0100502W WO 0149483 A1 WO0149483 A1 WO 0149483A1
Authority
WO
WIPO (PCT)
Prior art keywords
veneer
veneers
core
foam
layers
Prior art date
Application number
PCT/US2001/000502
Other languages
English (en)
Inventor
Lionel Brightwell
Original Assignee
Weyerhaeuser Company
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 Weyerhaeuser Company filed Critical Weyerhaeuser Company
Priority to AU34418/01A priority Critical patent/AU3441801A/en
Publication of WO2001049483A1 publication Critical patent/WO2001049483A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/04—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/04—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B21/047—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/14—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood board or veneer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B43/00—Operations specially adapted for layered products and not otherwise provided for, e.g. repairing; Apparatus therefor
    • B32B43/003—Cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0221—Vinyl resin
    • B32B2266/0228—Aromatic vinyl resin, e.g. styrenic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/08—Closed cell foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/718—Weight, e.g. weight per square meter

Definitions

  • the present invention relates to a lightweight, wood-based
  • sawn lumber is often dimensionally unstable, and may shrink or warp after
  • LVL is similar to plywood in that it is made by laminating a sandwich of
  • the moisture content of the veneers is set to the desired
  • every second veneer sheet is
  • a second benefit is that there is no size
  • veneers may be joined together to make LVL stock of any length. Yet another
  • LVL cannot easily be fabricated in larger dimensions without warping or
  • the weight of LVL can be a problem. This can become even more of a problem
  • Some hollow members have been constructed with a foam core.
  • the foam offers little, if any, structural support, and the panels may crash
  • One aspect of the present invention provides a lightweight
  • the member has opposing ends, and a core with a first
  • the core comprises alternating
  • veneer layers and polymer layers, and the veneer layers each include at least
  • a first laminated veneer lumber face is
  • Another aspect of the present invention provides a lightweight
  • structural member including a first piece of laminated veneer lumber with an
  • a plurality of veneer layers each with a longitudinal axis and opposing
  • layer includes at least one sheet of veneer.
  • opposing faces of the veneer layers are perpendicular to the upper face and
  • a plurality of polymer is a plurality of polymer
  • Yet another aspect of the present invention provides a lightweight
  • the core suitable for use as an interior of a structural member.
  • the core includes a
  • first laminated veneer lumber piece and a plurality of layers of a polymer material, including a first layer and a last layer, wherein each layer of the
  • polymer material is spaced apart from other layers, and wherein the first layer
  • each veneer layer including at least one sheet of
  • veneer is disposed between the layers of the polymer material.
  • each veneer layer has opposing faces, and each face of each veneer layer is in contact with
  • Fig. 1 is an isometric view of a lightweight stractural member
  • Fig. 2 is an isometric view of a core blank from which core pieces
  • Fig. 3 is an isometric view of a core blank with two core pieces
  • FIG. 4 is a sectional view of a core piece taken along line 4-4 of
  • FIG. 3 depicting a core piece before the first and second laminated veneer
  • Fig. 5 is a sectional view taken along line 5-5 of Fig. 1, depicting
  • Fig. 6 is a top plan view of one end of a second embodiment
  • Fig. 7 is a side sectional view taken along line 7-7 of Fig. 6;
  • Fig. 8 is a top plan view of one end of the second embodiment
  • Fig. 9 is a side sectional view taken along line 9-9 of Fig. 8;
  • Fig. 10 is an isometric view of the first embodiment, with the
  • Fig. 11 is an isometric view of the first embodiment
  • Fig. 12 is a schematic representation of the laying-up process for
  • the present invention provides a novel lightweight structural
  • a first embodiment of the present invention is a laminated veneer lumber, or LVL, that avoids the problems of many known structural members.
  • Fig. 1 depicted in Fig. 1 and is indicated generally at 10. This
  • structural member 10 has a core piece 12, a first face piece 14 and a second
  • the length L of member 10 is typically greater than the width
  • the thickness T of member 10 can be chosen to suit the strength and
  • second face pieces is one inch. This defines a one-inch space for core piece 12.
  • the core piece 12 is constructed of alternating layers of a veneer
  • the side pieces 22 of the core piece 12 are
  • the veneer layers 18 provide support for the center portions of
  • each veneer layer 18 may be used for each veneer layer 18
  • Expanded polymer layers 20 provide lateral support for veneer
  • a closed cell material is preferable to an open
  • the preferred closed cell expanded polymer is foamed
  • polystyrene such as STYRAFOAM ® .
  • the sides 22 of core piece 12 are normally made of pieces of
  • LVL comprising multiple layers of veneers.
  • the present invention may be fabricated in any number of ways, an example
  • Member 10 is constructed by
  • Figure 2 shows a core blank at 24, from which individual core pieces may be
  • Core blank 24 is manufactured to be essentially the same length as the
  • core blank 24 is constructed to a
  • the thickness T of member 10 in Fig. 1 includes the thickness
  • Core blank 24 has a width that corresponds
  • the first step in the manufacture of the core piece 12 is the
  • core blank 24 may be constructed.
  • veneer layer 118 in the core blank 24 corresponds to veneer layer 18
  • Core blank 24 is made of alternating layers of 1/8" thick veneer
  • core blank 24 are 1" x 24 x / 2 x 16.1' pieces of laminated veneer lumber.
  • core blank 24 is a pressure sensitive hot melt glue. It serves to hold together
  • first and second face pieces 14 and 16 can be added to core piece
  • bottom layer 122 is placed on the adhesive-coated surface of bottom
  • expanded layer 120 is added. Alternating layers of veneer 118 and expanded
  • the last layer added is the LVL top layer 122a.
  • top layer 122a is added, the entire core blank 24 is pressed together, for
  • indicated at 28 represent additional cuts that may be made to remove more core
  • Figure 4 shows a sectional view of the finished core piece 12
  • both side pieces 22 are in full contact with the adjacent expanded polymer layers. Furthermore, both the top surface 30 and the bottom surface 32
  • each veneer layer 18 will be in good contact with face pieces 14 and 16 of the
  • Figure 5 is a sectional view of a completed structural member
  • thermosetting glue This lay
  • veneer of face piece 16 is first laid up and a coat of phenolic resin or other
  • veneer 16a glue is applied to it.
  • the inner-most veneer 16c is then
  • veneers 14a, 14b and 14c are sequentially applied to core piece 12
  • the assembly is then passed to a microwave press where
  • polystyrene foam 20 may begin to degrade.
  • a conventional press may be used without
  • microwave assist In that event curing is likely to take about 8 hours.
  • core piece 12 structural integrity of core piece 12 is such that it can withstand these curing
  • stractural members 10 are
  • an end cap 40 shown in Figs. 8 and
  • End caps
  • a polyol and an isocyanate in amounts effective to form a polyurethane.
  • diphenol diisocyanate diphenol diisocyanate.
  • Calcium carbonate is used as a filler.
  • a chain extender such as ethylene glycol may also be added, as may a cross-linking agent such as
  • titanium dioxide may be used. In some embodiments, titanium dioxide may be used.
  • mixture could be comprised of the following materials in these percentages by
  • the castor oil is first mixed with the calcium
  • the castor oil may be
  • the slurry may then be heated to reduce its viscosity prior to mixing.
  • the slurry may then be heated to reduce its viscosity prior to mixing.
  • End caps 40 are applied to each of the members 10 by first cutting
  • end caps may be used, or they may be deleted altogether.
  • end cap 40 is, however, the preferred embodiment.
  • FIG. 10 shows side piece 14', before the
  • top or outer laminate or veneer of the three-laminate LVL has been applied.
  • the cross-laminate, shown at 46, is typically about 18 inches wide. Grain lines
  • FIG. 11 shows the side piece 14' after the
  • splitting may take place because the wood covered by the end caps is
  • veneer lumber normally includes laminates having grains extending the same
  • the laminates has portions having a grain extending perpendicular to the grain
  • cross wise laminate 46 includes cross wise laminate 46, as well as end caps 40. It may be that in some
  • crosswise laminate is provided for the entire length of member

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)

Abstract

L'invention concerne un élément structurel léger (10, 24) permettant de supporter des charges. Cet élément présente des extrémités opposées (22), et une partie centrale (12) avec une première surface s'étendant entre les extrémités opposées. Cette partie centrale comprend des couches de placage alternées (18) et des couches de polymère (20), et les couches de placage comprennent chacune au moins une feuille de placage. En outre, une première face de bois de placage (14 and 16) est collée au moins à une partie importante de la première surface de la partie centrale. L'élément peut comprendre une deuxième surface s'étendant entre les extrémités opposées, avec une deuxième face de bois de placage laminée collée au moins à une partie importante de la deuxième surface de la partie centrale.
PCT/US2001/000502 2000-01-05 2001-01-03 Element structurel leger WO2001049483A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU34418/01A AU3441801A (en) 2000-01-05 2001-01-03 Lightweight structural member

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US47803900A 2000-01-05 2000-01-05
US09/478,039 2000-01-05

Publications (1)

Publication Number Publication Date
WO2001049483A1 true WO2001049483A1 (fr) 2001-07-12

Family

ID=23898289

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/000502 WO2001049483A1 (fr) 2000-01-05 2001-01-03 Element structurel leger

Country Status (2)

Country Link
AU (1) AU3441801A (fr)
WO (1) WO2001049483A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101830012A (zh) * 2010-05-07 2010-09-15 广西大学 单板条双向定向重组木板及其制造方法
WO2014037286A1 (fr) * 2012-09-07 2014-03-13 Ed. Züblin Ag Panneau de lames de bois multicouche
BE1024499B1 (nl) * 2017-01-04 2018-03-13 Den Nieuwen Buiten Bvba Een nieuw geïsoleerd bouwelement met kruisligging van de vezels en werkwijze voor gebruik daarvan
GB2558215A (en) * 2016-12-22 2018-07-11 Gurit Uk Ltd Cores for composite material sandwich panels

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3637459A (en) * 1970-03-17 1972-01-25 Dow Chemical Co Structural panel having foam plastic core
US3976526A (en) * 1974-09-16 1976-08-24 The Dow Chemical Company Preparation of curved composite panel containing a rigid foamed plastic
US4005239A (en) * 1972-11-15 1977-01-25 Formica Corporation Decorative laminated panel and process for preparing the same
US5365705A (en) * 1991-06-07 1994-11-22 Massachusetts Institute Of Technology Roof panel design and single beam roof assembly

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3637459A (en) * 1970-03-17 1972-01-25 Dow Chemical Co Structural panel having foam plastic core
US4005239A (en) * 1972-11-15 1977-01-25 Formica Corporation Decorative laminated panel and process for preparing the same
US3976526A (en) * 1974-09-16 1976-08-24 The Dow Chemical Company Preparation of curved composite panel containing a rigid foamed plastic
US5365705A (en) * 1991-06-07 1994-11-22 Massachusetts Institute Of Technology Roof panel design and single beam roof assembly
US5640812A (en) * 1991-06-07 1997-06-24 Massachusetts Institute Of Technology Roof panel design and single beam roof assembly

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101830012A (zh) * 2010-05-07 2010-09-15 广西大学 单板条双向定向重组木板及其制造方法
WO2014037286A1 (fr) * 2012-09-07 2014-03-13 Ed. Züblin Ag Panneau de lames de bois multicouche
GB2558215A (en) * 2016-12-22 2018-07-11 Gurit Uk Ltd Cores for composite material sandwich panels
GB2558215B (en) * 2016-12-22 2019-05-29 Gurit Uk Ltd Cores for composite material sandwich panels
BE1024499B1 (nl) * 2017-01-04 2018-03-13 Den Nieuwen Buiten Bvba Een nieuw geïsoleerd bouwelement met kruisligging van de vezels en werkwijze voor gebruik daarvan
EP3480385A3 (fr) * 2017-01-04 2019-10-16 Den Nieuwen Buiten BVBA Nouvel élément de construction stratifié, croisé, isolé et son procédé d'utilisation

Also Published As

Publication number Publication date
AU3441801A (en) 2001-07-16

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