WO2011137537A1 - Bois de placage composite à copeaux longs et procédés et systèmes de fabrication de celui-ci - Google Patents

Bois de placage composite à copeaux longs et procédés et systèmes de fabrication de celui-ci Download PDF

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Publication number
WO2011137537A1
WO2011137537A1 PCT/CA2011/050273 CA2011050273W WO2011137537A1 WO 2011137537 A1 WO2011137537 A1 WO 2011137537A1 CA 2011050273 W CA2011050273 W CA 2011050273W WO 2011137537 A1 WO2011137537 A1 WO 2011137537A1
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WO
WIPO (PCT)
Prior art keywords
veneer
making
strand lumber
strands
lumber product
Prior art date
Application number
PCT/CA2011/050273
Other languages
English (en)
Inventor
Wu-Hsiuing Ernest Hsu
Chunping Dai
Original Assignee
Fpinnovations
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 Fpinnovations filed Critical Fpinnovations
Publication of WO2011137537A1 publication Critical patent/WO2011137537A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/10—Moulding of mats
    • B27N3/14—Distributing or orienting the particles or fibres
    • B27N3/143—Orienting the particles or fibres
    • 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
    • B32B21/02—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board the layer being formed of fibres, chips, or particles, e.g. MDF, HDF, OSB, chipboard, particle board, hardboard
    • 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
    • B32B21/13—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board all layers being exclusively wood
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/42—Layered products comprising a layer of synthetic resin comprising condensation resins of aldehydes, e.g. with phenols, ureas or melamines
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
    • 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
    • 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
    • B32B2317/00—Animal or vegetable based
    • B32B2317/16—Wood, e.g. woodboard, fibreboard, woodchips
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives

Definitions

  • This invention relates to structural composite lumber (SCL) products and methods and systems for making same.
  • SCL structural composite lumber
  • SCL products include oriented strand lumber (OSL), laminated veneer lumber (LVL), and parallel strand lumber (PSL, also known as Parallam 1 M ).
  • OSL oriented strand lumber
  • LDL laminated veneer lumber
  • PSL parallel strand lumber
  • LVL and PSL use veneers.
  • PSL is a proprietary product often considered to have been invented by Barnes (US Patent No. RE 30,636).
  • a similar product using veneer strands has also proposed by Parker (US Patent Application Publication No. US 2008/01 10565).
  • LVL although lightweight, has low wood recovery because the product uses mostly full veneer sheets (normally 4 ft by 4 ft or 4 ft by 8 ft in size), and it does not use or uses very little non-full veneer sheets such as random (narrow) sheets and "fishtails" (as they are known in the art).
  • the non-full veneer sheets that are wasted normally account for 15-20% of total wood volume. In the case of dry logs or mountain pine beetle (MPB) killed logs, the proportion of wasted non-full veneer sheets rises to 30-40%. In most cases, these waste veneers are converted to chips which are of low value.
  • MPB mountain pine beetle
  • PSL aims to utilize all veneer sheets by cutting full and non-full veneer sheets into strands and gluing them using high pressure which, combined with high pressing temperature, results in high wood densification.
  • the end product is usually 40-50 heavier than the original wood.
  • PSL is also about 30-35% heavier. As such, the resulting volumetric recovery of wood is low.
  • Another problem with PSL is the extra transportation cost that must be incurred in bringing veneer sheets in from other veneer mills.
  • PSL and OSL are not ideal composite lumbers in terms of forest utilization and production cost to achieve desired strength and stiffness.
  • Producers of the two products claim a mass conversion of up to 65% of a whole log into high grade structural lumber, but the actual volume conversion from logs to products is typically only 35% or lower.
  • OSL has much lower mechanical properties than PSL while PSL has a much higher wood cost than OSL.
  • An SCL product as stiff as PSL and yet as inexpensive to produce as OSL is desirable.
  • Modulus of elasticity is a measure of material's stiffness. This property is of high importance for structural material, and is also commonly used to rate structural products. Different products have different MOE values, and accordingly there are requirements on MOE values of products for different end-applications.
  • MOE value of regular oriented strand board (OSB) products is approximately 0.47 to 1.14E (MM psi) along the major axis and 0.08 to 0.36E (MM psi) across the major panel axis, respectively.
  • the minimally required MOE ranges are 0.75 to 1 .15 E and 0.25 to 0.5E respectively.
  • the minimally required MOE value is about 1.30 E (MM psi).
  • the required MOE value is equal to or above 1.80 E (MM psi).
  • the MOE required by the customer may be as high as
  • the specific MOE is a material MOE divided by its density. It is also known as the MOE-to-weight ratio or MOE -to-density ratio. High specific MOE of a material means that it possess high MOE value at a relatively lower density, which is preferred. 2. High volume conversion ratio for final product from raw material
  • a prototype SCL product should meet the following criteria for commercial potential:
  • An SCL product that meets at least some of the above criteria and addresses at least some of the drawbacks of existing SCL products is desirable.
  • One aspect provides a method for making a composite veneer strand lumber product core including the steps of:
  • Another aspect provides a method for making a composite veneer strand lumber product including the steps of:
  • Another aspect provides a method for making a composite veneer strand lumber product including the steps of:
  • Another aspect provides a method for making a composite veneer strand lumber product including the steps of:
  • Another aspect provides a veneer strand lumber product including a first layer including one or more veneer sheets, a second layer including a plurality of veneer strands and a third layer including one or more veneer sheets.
  • Another aspect provides a method according to any of the above-noted methods including a final step of cutting the product produced by the method into lumber having desired predetermined dimensions.
  • Another aspects provides a system for carrying out any of the above-noted methods wherein logs are cut into both full veneer sheets and non-full veneer sheets, and wherein the non-full veneer sheets are subsequently clipped into the veneer strands.
  • FIG 1A shows a front schematic view of veneer strand lumber (VSL) according to one embodiment of the invention
  • Figure IB shows a perspective view of the embodiment shown in Figure 1 A
  • Figure 2 is a flowchart showing a core layer formation and production process according to one embodiment of the invention.
  • Figure 3A shows a cross-section of a strand for making VSL according to one embodiment of the invention
  • Figure 3B shows VSL incorporating strands of the type illustrated in Figure 3 A
  • Figure 3C shows a cross-section of a strand for making VSL according to one embodiment of the invention
  • Figure 3D shows VSL incorporating strands of the type shown in Figure 3C.
  • FIG. 4 is a flowchart showing an integrated veneer sheet - veneer strand production system according to one embodiment of the invention.
  • Figure 5 is a flowchart showing an integrated veneer sheet - veneer strand production system according to one embodiment of the invention.
  • Figure 6 is a flowchart showing an integrated veneer sheet - veneer strand production system according to one embodiment of the invention.
  • Figure 7 is a graph showing a pressing schedule for VSL according to one embodiment of the invention.
  • Figure 8 illustrates the structure of VSL according to one embodiment of the invention alongside the structures of PSL, LVL, and OSL.
  • Figure 9 illustrates the stnicture of VSL according to one embodiment of the invention along side the structure of cross laminated timber (CLT).
  • Figure 10 is a table showing the density and bending properties of VSL according to one embodiment of the invention made from mountain pine beetle (MPB) killed logs.
  • MPB mountain pine beetle
  • VSL veneer strand lumber
  • the present inventors A low cost high performance SCL product termed veneer strand lumber (VSL) has been developed by the present inventors.
  • VSL has been found to be lightweight, high yield, and to possess high stiffness and strength.
  • Certain embodiments of the invention relate to a three-layer VSL in which the upper and lower layers include veneer sheets in longitudinal alignment, and in which the core layer includes veneer strands in either longitudinal or lateral alignment.
  • VSL differs from existing products such as LVL and PSL by combining the use of full veneer sheets and veneer strands in one product.
  • the veneer strands can be cut from non-full veneer sheets including "fishtails" and random veneer sheets, significantly minimizing the loss that would otherwise result from such waste veneers.
  • Wood recovery with VSL is estimated to be 10- 15% higher than PSL and LVL.
  • VSL The performance of VSL can be manipulated, for example, by using different grades of full sheets and densifications.
  • Certain embodiments of the invention relate to methods for making VSL, including making VSL in a single facility, eliminating for example the cost of shipping non-full veneer sheets.
  • VSL may be glued using one-step pressing, after the veneer sheet and veneer strand layers are processed separately in clipping, drying and glue applications and joined together during the forming operation.
  • Certain embodiments of the invention make and use veneer strands with specific geometry and size, (B) achieve excellent strand orientation by employing a vibrating orienter, (C) employ a dual resin system to easily handle resinated strands and achieve better bonding, and/or (D) provide heating methods which achieve a faster rise in core temperature to shorten hot-pressing time.
  • VSL may be made from regular wood and lower quality wood such as MPB-killed wood, decadent wood (e.g. hem-fir), and other lignocellulosic materials such as bamboo, plant fibre, hemp fibre, and the like.
  • MPB-killed wood e.g. MPB-killed wood
  • decadent wood e.g. hem-fir
  • other lignocellulosic materials such as bamboo, plant fibre, hemp fibre, and the like.
  • VSL 10 includes upper surface layer 12 and lower surface layer 14 of continuous veneer sheets and a core layer 16 of veneer strands, all aligned in a longitudinal direction.
  • the veneer strands of the core layer may be aligned in a lateral direction to achieve more balanced properties in both directions.
  • the upper and lower surface layers may consists of 1 -5 veneer sheets while the core layer is occupied by veneer strands.
  • the upper and lower surface layers may consist of greater than 5 veneer sheets each. The number of sheets in the upper and lower surface layers may or may not be the same.
  • Figure 2 illustrates an overall core formation and production process according to an embodiment.
  • the logs are peeled, then clipped into strands.
  • the strands may be 1/4 - 2 inches wide and may be 1 - 3 feet long.
  • the strands may have angled cross-sections as shown in Figures 3C and 3D.
  • strands having angled cross-sections may pack more closely during forming and reduce densification during pressing.
  • the strands are dried, and then applied with a structural glue or resin such as phenol formaldehyde (PF) in a different line. Next, the strands are aligned and formed into a parallel strand mat.
  • PF phenol formaldehyde
  • the strand mat may be preheated to 80-90 °C using hot air, steam or high frequency heating methods (e.g. microwave or RF radiation), before it is pressed.
  • the mat may then be pressed using a conventional hot platen or other pressing method. Pre-heating enables the strand core to be compressed to a higher density.
  • the completed mat may then be further cut and/or finished into a variety of VSL products including those shown in Figures 8 and 9, as discussed below.
  • the foregoing method may, for example, be used to form the core of the VSL shown in Figure 3D.
  • Figure 4 illustrates an embodiment in which both veneer sheets and veneer strands for use in the invention are produced.
  • the logs are peeled into veneers, which are then clipped into strands or full sheets depending upon sheet continuity.
  • Non-full sheets such as fishtails and random sheets are clipped, preferably into angled strands (see Figures 3C and 3D), which may be 1/4 - 2 inches wide and 1 - 3 feet long.
  • the full sheets are graded, dried and applied with a structural glue or resign such as phenol formaldehyde (PF) in a different line.
  • the strands are likewise glued and aligned and formed into a parallel strand mat as described above.
  • the strand mat may be preheated to 80-90 °C, before it is merged with full veneer sheets.
  • the combination is then pressed using a conventional hot platen press.
  • the pre-heating enables the strand core to be compressed to a higher density than that of the surface veneer sheets, in order to achieve adequate bonding throughout the product.
  • the resultant product may, for example, be the VSL shown in Figure 3D, comprising the densely packed core formed from optimally shaped and aligned strands, laminated together with veneer outer surface layers.
  • Figure 5 shows an embodiment in which the strand core is fed directly onto a lower layer of veneer sheets and then topped with a balanced upper layer of veneer sheets before being transported into the press.
  • the press may use a high frequency heating method such as microwave or RF radiation to ensure uniform consolidation.
  • Figure 6 shows an embodiment in which the strand core is merged with the veneer sheet faces and pressed using a conventional platen press without pre-heating or high frequency heating. This method is less expensive but may produce a product that is lower in density and strength properties in the core.
  • FIG. 7 shows a pressing schedule according to certain embodiments which use a mat pressure substantially lower than those used for making conventional strand products.
  • the mat pressure for VSL may be between 200-350 psi compared to 500-700 psi used for pressing conventional strand products. When preheating is used, a lower mat pressure (e.g. 200-280 psi) will be needed.
  • the platen temperature is also much lower to reduce densification in surface veneer sheets and gas pressure. In some embodiments, the platen temperature for VSL may be below 180 °C compared to temperatures of over 210 °C normally used for pressing conventional strand products.
  • FIG. 8 illustrates VSL 20 according to an embodiment alongside PSL P, LVL L and OSL O.
  • VSL 20 has performance characteristics and applications similar to LVL and PSL.
  • FIG 9 illustrates VSL 30 according to an embodiment alongside cross laminated timber (CLT) C.
  • CLT is an engineered wood product being increasingly used for higher storey buildings.
  • VSL 30 is a thick, cross laminated VSL, similar to CLT C.
  • Figure 10 is a table comparing the density and bending properties of VSL according to an embodiment made from MPB-killed logs to LVL and PSL. While density of the VSL is lower, bending MOEs of the VSL are comparable with existing LVL and PSL.
  • VSL strands (0.080" - 0.130" thick) are much thicker than those used in OSL (0.045" thick) and much shorter ( 1 -3 feet long) than PSL strands (3-8 feet long). Thicker strands improve resin area coverage which in turn helps reduce resin costs. Shorter strands improve recovery. VSL manufacture involves improved alignment of strands and formation of strand mats through using a vibrating conveyor with alignment plates, or vibrating alignment plates, rather than a conventional disc orienter. Better alignment results in better strength and stiffness properties. More specifically, according to some embodiments VSL strands are oriented along the length of the lumber to enhance the strength and stiffness along this direction. This requirement is optimized through the use of vibrating conveyor systems, as described in US provisional application no.
  • the vibrating conveyor system aligns the strands to form a strand mat for VSL.
  • the resultant orientation angle values of strand layers formed are 6.25° and 5.33° for 1 to 2 foot strands for 3.5" gaps between every two adjacent alignment plates, respectively. Orientation may be further improved by reducing the plate gap.
  • the vibrating conveyor system improves strand alignment, and better orientation is achieved even with short strands as long as their length is bigger than the gap between the alignment plates.
  • the vibrating conveyor system also reduces voids in the products and improves the uniformity of the formed strand mat.
  • pMDI An inexpensive but effective resin system is used instead of pMDI.
  • dual resin systems e.g. pMDI/MURF, or pMDI/PF, or low molecular PF/high molecular PF are used to make VSL according to some embodiments.
  • VSL uses hot and humid compressed air injection instead of steam injection during pre-heating/hot pressing, or a combination of steam injection followed by hot and dry compressed air (use steam first to heat the mat, and then use hot & dry air to blow out the excessive steam to ensure the cure of PF resin after the curing temperature required is reached).
  • VSL uses both full veneer sheets and non-full veneer sheets, allowing wood recovery to be maximized. Compared to LVL, VSL may improve the wood recovery by at least 10%.
  • VSL is compressed less than PSL, which further improves volumetric recovery.
  • the density of VSL is 10 - 15% less than PSL, making the former lighter and significantly higher in volumetric recovery.
  • VSL can be made in both parallel (longitudinal) and cross (lateral) layer orientations.
  • Parallel VSL emulates the structure and performance of LVL and PSL, whereas cross VSL can outperform and replace CLT due to superior rolling shear resistance and uniformity of VSL.
  • VSL can also be made of 100% strands, preferably in a layered structure whereby smaller strands are placed in the middle layer and larger strands are placed in the outer layers, to maximize the recovery and properties.
  • the terms “smaller” and “larger” may refer to one or more of width, length and thickness of the strands.
  • VSL can also be made using a two-step pressing procedure.
  • the mat of strands is formed, pressed and glued first.
  • the billet can be used as a solid core to be then overlaid with veneer sheets in a second pressing process.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Manufacturing & Machinery (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un noyau de produit de bois de placage composite à copeaux longs. Le procédé inclut les étapes de : (a) application d'une résine à une pluralité de copeaux longs de placage ; (b) alignement des copeaux longs de placage et transformation de ceux-ci en un mat ; et (c) compression du mat de copeaux longs de placage avec une presse. L'invention décrit aussi un procédé de fabrication d'un produit de bois de placage composite à copeaux longs. Le procédé inclut les étapes de (a) fabrication d'un noyau de produit de bois composite de placage à copeaux longs comme décrit, le noyau ayant une face supérieure et une face inférieure ; (b) application d'une résine à une pluralité de feuilles de placage ; (c) assemblage d'une ou de plusieurs des feuilles de placage sur chacune des faces supérieure et inférieure du noyau pour former une combinaison de trois couches de : une couche de feuille de placage supérieure, une couche de noyau incluant des copeaux longs et une couche de feuille de placage inférieure ; et (d) compression de la combinaison de trois couches ensemble avec une presse.
PCT/CA2011/050273 2010-05-07 2011-05-04 Bois de placage composite à copeaux longs et procédés et systèmes de fabrication de celui-ci WO2011137537A1 (fr)

Applications Claiming Priority (2)

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US33246910P 2010-05-07 2010-05-07
US61/332,469 2010-05-07

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10577753B2 (en) 2015-08-03 2020-03-03 Sterling Site Access Solutions, Llc Crane mat and method of manufacture
EP3804929A1 (fr) * 2019-10-08 2021-04-14 Goodrich Corporation Procédé et système pour le séquençage d'un placage en noyau de bois
US11413784B1 (en) 2017-06-12 2022-08-16 Boise Cascade Company Method for manufacturing wood products formed from natural veneer sheets and veneer strands

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429235A (en) * 1942-03-13 1947-10-21 Plymouth Cordage Co Stiff structural sheet
US3769143A (en) * 1971-09-08 1973-10-30 Int Paper Co Resin impregnated cellulosic veneer and laminated panels
US3916059A (en) * 1973-11-29 1975-10-28 Henry J Molloy Laminated panel, particularly for furniture construction
US4061819A (en) * 1974-08-30 1977-12-06 Macmillan Bloedel Limited Products of converted lignocellulosic materials
US5096765A (en) * 1990-08-29 1992-03-17 Macmillan Bloedel Limited High strength composite products and method of making same
US20070144663A1 (en) * 2005-12-23 2007-06-28 Huber Engineered Woods L.L.C. Process for manufacture of oriented strand lumber products
US20080110565A1 (en) * 2003-11-10 2008-05-15 David Parker Composite Wood Product and Method for Making the Wood Product

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429235A (en) * 1942-03-13 1947-10-21 Plymouth Cordage Co Stiff structural sheet
US3769143A (en) * 1971-09-08 1973-10-30 Int Paper Co Resin impregnated cellulosic veneer and laminated panels
US3916059A (en) * 1973-11-29 1975-10-28 Henry J Molloy Laminated panel, particularly for furniture construction
US4061819A (en) * 1974-08-30 1977-12-06 Macmillan Bloedel Limited Products of converted lignocellulosic materials
US5096765A (en) * 1990-08-29 1992-03-17 Macmillan Bloedel Limited High strength composite products and method of making same
US20080110565A1 (en) * 2003-11-10 2008-05-15 David Parker Composite Wood Product and Method for Making the Wood Product
US20070144663A1 (en) * 2005-12-23 2007-06-28 Huber Engineered Woods L.L.C. Process for manufacture of oriented strand lumber products

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10577753B2 (en) 2015-08-03 2020-03-03 Sterling Site Access Solutions, Llc Crane mat and method of manufacture
US11124925B2 (en) 2015-08-03 2021-09-21 Sterling Site Access Solutions, Llc Crane mat and method of manufacture
US11566385B2 (en) 2015-08-03 2023-01-31 Sterling Site Access Solutions, Llc Crane mat and method of manufacture
US11413784B1 (en) 2017-06-12 2022-08-16 Boise Cascade Company Method for manufacturing wood products formed from natural veneer sheets and veneer strands
EP3804929A1 (fr) * 2019-10-08 2021-04-14 Goodrich Corporation Procédé et système pour le séquençage d'un placage en noyau de bois

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