Method of producing a laminated wood product, and laminated wood products

专利摘要:
The present disclosure provides a method of forming a laminated wood product, which is adapted for receiving a load in a direction perpendicular to a principal fiber direction of the wood. The method comprises cutting a log (2) along the principal fiber direction of the log, into a plurality of wood lamellae (20a, 20b), such that the wood lamellae are formed as radial sections of the log, forming the wood lamellae (20a, 20b) to provide each wood lamella with a trapezoidal cross section, whereby the wood lamellae present a respective planar major base surface (bs1) that is formed at a radially outer part of the log (2) and a respective planar minor base surface (bs2) that is formed at a radially inner part of the log (2), arranging the lamellae (20a, 20b) as at least one layer in which planar major base surfaces (bs1) of immediately adjacent lamellae (20a, 20b) face opposite directions, and gluing together the lamellae (20a, 20b) side surface to side surface (ss1, ss2) such that a wood billet is formed. The method further comprises arranging the wood lamellae (20a, 20b) such that the major base surfaces (bs1) of immediately adjacent wood lamellae taper in opposite directions, and the gluing comprises wet gluing.Elected for publication: Fig. 1e
公开号:SE1550853A1
申请号:SE1550853
申请日:2015-06-18
公开日:2016-12-19
发明作者:Hirmke Markus
申请人:Stora Enso Oyj；
IPC主号:

专利说明:

METHOD OF PRODUCING A LAMINATED WOOD PRODUCT, ANDLAMINATED WOOD PRODUCTS Technical Field The present disclosure relates to a structural member, which may beused as a beam, a joist, a stud, a pillar or the like. The disclosure also relatesto a method of producing the structural member.
BackgroundCurrently, glue-laminated beams (“gluelam”) in Europe are mostly produced according to DIN 1052:2008 (German standard) or DIN EN 14080:2013-09 (harmonized European standard). The beams are built up withvisually graded or machine graded boards, which are produced and kiln-driedin sawmills in the traditional way.
The gluelam producer takes these boards as raw material, gradesthem and produces the required lamellae by cutting out defects (e.g. knots)and finger-jointing the pieces together. After the finger-jointed lamellae havebeen planed, glue is applied and the beam is formed by gluing the lamellaetogether. The final steps may comprise planing the beam, removing opticaldefects, packaging and loading it.
Hence, traditionally, timber is sawn into planks or lamellae according tothe scheme depicted in Fig. 1 of US5816015, which discloses alternativemethods of forming wood beams by laminating together a plurality of planksor lamellae.
EP1277552A2 discloses a similar method of forming a wood beam bycutting a round piece of timber into a plurality of strips having a trapezoidalcross section and laminating together the pieces thus formed into a beam.
US4122878 discloses a method of converting balsa wood of relativelysmall diameter into panels.
There is still a need to provide improved use of the timber raw material,as well as a need for beams having improved strength and/or reducedvariation in strength between different beams.
Summarylt is a general object of the present invention to provide an improved structural member, such as a beam, a joist, a stud, a pillar or the like. Aparticular object includes the provision of a structural member which makesbetter use of existing raw materials and which is stronger. Further objectsinclude the provision of improved control of the production process ofstructural members, such that properties of resulting members will presentless variation.
The invention is defined by the appended independent claims, withembodiments being set forth in the dependent claims and in the followingdescription and drawings.
According to a first aspect, there is provided a method of forming alaminated wood product, which is adapted for receiving a load in a directionperpendicular to a principal fiber direction of the wood, the method comprisingcutting a log along the principal fiber direction of the log, into a plurality ofwood lamellae, such that the wood lamellae are formed as radial sections ofthe log. The method further comprises forming the wood lamellae to provideeach wood lamella with a trapezoidal cross section, whereby the woodlamellae present a respective planar major base surface that is formed at aradially outer part of the log and a respective planar minor base surface thatis formed at a radially inner part of the log, arranging the lamellae as at leastone layer in which planar major base surfaces of immediately adjacentlamellae face opposite directions, and gluing together the lamellae sidesurface to side surface such that a wood billet is formed. The method furthercomprises arranging the wood lamellae such that the major base surfaces ofimmediately adjacent wood lamellae taper in opposite directions. The gluingcomprises wet gluing.
The term “major base surface” is defined as the greater one of the twobase surfaces of a body having a trapezoidal cross section. Likewise, the“minor base surface” is defined as the smaller one of the base surfaces of abody having trapezoidal cross section. 3 The term “wet gluing” is defined as gluing at a moisture content of thewood lamellae greater than 25 % by dry mass, preferably greater than 30 %by dry mass.
The moisture content is calculated in relation to the mass of the drywood, i.e. moisture content = (mass of wood + mass of water)/(mass ofwood).
A glue that is suitable for wet gluing may be a polyurethane basedglue.
The forming may comprise a first forming step, in which the major basesurfaces are formed along the outermost part of the log, preferably along adirection which is substantially parallel with the outermost surface of the log.
By “substantially parallel” is understood that there is an angulardeviation of less than 3°, preferably less than 2° or less than 1°.
The minor base surfaces may be formed along a direction which, asseen in a plane containing the pith, presents an angle relative to a pithdirection, that is greater than an angle between the major base surface andthe outermost surface of the log.
The forming may comprise a second forming step, in which the minorbase surfaces are formed by removal of material at a portion of the respectivelamella, which is closest to the pith, and wherein more of a height of thetrapezoidal cross section is removed when forming the minor base surfacethan when forming the major base surface.
The cutting may comprise cutting the wood lamellae to an apex angleof less than 45°, preferably less than or equal to 40°, less than or equal to 36°or less than or equal to 30°.
Specifically preferred angles may be 45°, 40°, 36°, 30°, 24°, or 22.5°.
The method as claimed in any one of the preceding claims, whereinarranging the lamellae comprises arranging the lamellae as a single layer,with base surfaces exposed.
The arranging may comprise turning every second lamella 180° aboutits longitudinal axis and 180° about an axis which is perpendicular to thelongitudinal axis and perpendicular to its base surfaces. 4 The method may further comprise cutting the billet along a plane whichis parallel to the principal fiber direction, and preferably perpendicular to thebase surfaces, thus forming a plurality of planks.
As an alternative, or supplement, the method may further comprisecutting the billet along a plane which is parallel to the principal fiber direction,and preferably parallel with the base surfaces, thus forming a plurality ofsheets.
The cutting may be performed such that each plank comprises portionsof at least two glued-together lamellae. ln particular embodiments, each plankmay comprise portions of 2, 3, 4, 5, 6 or more lamellae.
The method may further comprise subjecting the planks to a dryingstep, such as a kiln drying.
The method may further comprise joining together at least two of thedried planks in an end-to-end manner, e.g. through finger-jointing, such that alonger plank is formed.
Such finger-jointing may be performed by a dry-gluing method.
The method may further comprise laminating together at least twodried planks and/orjoined-together planks by gluing base surface to basesurface.
According to a second aspect, there is provided a laminated woodproduct, adapted for receiving a load in a direction perpendicular to a principalfiber direction of the wood. The wood product comprises at least two glued-together wood lamellae, which are formed as radial sections of a log, eachhaving a lamella cross section which is parallel with a cross section of thewood product and a longitudinal direction which is parallel with a longitudinaldirection of the wood product and with a principal fiber direction of the woodlamellae. The lamellae present cross sections which are trapezoidal andpresent a respective planar major base surface that is formed at a radiallyouter part of the log and a respective minor base surface that is formed at aradially inner part of the log. The lamellae are arranged as at least one layerin which major base surfaces of immediately adjacent lamellae face oppositedirections. The major base surfaces of immediately adjacent wood lamellae 5 taper in opposite directions. The wood lamellae are glued together by a gluesuitable for wet gluing.
Such a laminated wood product may have a moisture content of lessthan 25 % by dry mass, preferably less than 15 % or less than 10 %.
The lamellae may be arranged as a single layer, with the basesurfaces exposed.
The lamellae may be arranged as at least two layers, which are gluedtogether base surface to base surface.
Such at least two layers may be glued together by wet gluing or drygluing.
According to a third aspect, there is provided an elongate woodmember comprising at least two laminated wood products as describedabove, which are joined together end-to-end, e.g. by a fingerjoint connection. lt is recognized that an area of the cross section may be smaller thanan area of any adjoining side perpendicular to the cross section.
The wood product may be formed of a plurality of lamellae.
However, the wood product may be formed by two or more lamellae, atleast one of which presents an incomplete trapezoidal cross sections due tosawing in a direction perpendicular to the cross section. ln the wood product or wood plank, at least 50 %, preferably at least 75% or at least 95 %, of the wood lamellae may present a modulus of rupturegreater than 6 MPa X 103, preferably greater than 10 MPa X 103 or greaterthan 15 iviPa x 103. ln the wood product or wood plank, at least 50 %, preferably at least 75% or at least 95 %, of the wood lamellae may present a density of at least 200kg/m3, preferably at least 400 kg/m3 or at least 600 kg/m3, said density takenat 15 % RH, 25 °C (about 5 % moisture ratio). lt is contemplated that in most practical applications, there will be asingle species of wood, and thus all of the wood will exhibit the modulus of rupture property and/or the density mentioned above.
Brief Description of the Drawinqs 6 Figs 1a-1 k schematically illustrate a method of making a laminatedwood product.
Fig 2a is a schematic side view of a system for producing woodIamellae Fig. 2b is a schematic sectional view taken along line A-A of Fig. 2a.
Figs 3a-3c schematically illustrate an alternative method of processingthe intermediate wood product provided in Fig. 1h.
Figs 4a-4c schematically illustrate yet another alternative method of processing the intermediate wood product provided in Fig. 1h.
Detailed DescriptionFig. 1a schematically illustrates a log 2, which has been cut longitudinally into two halves 2'. The log 2 may have been debarked prior tothis cutting. The cutting may be performed by any type of cutting device, suchas, but not limited to, a saw, e.g. a circular saw or a band saw.
Fig. 1b schematically illustrates a log half 2' after it has provided with alongitudinally extending groove 23 along its pith and cut longitudinally into sixradial sections 2”a, 2”b, as will be further described with reference to Figs 2a-2b.
Fig. 1c schematically illustrates processing of one of the radial sections2”a, 2”b into a lamella 20a, 20b. The lamella 20a, 20b is subjected to formingof base surfaces bs1, bs2, to form a lamella 20a, 20b, which will present atrapezoidal cross section.
The base surfaces bs1, bs2 thus formed comprise a major basesurface bs1, which is formed by tool 31 closest to the bark of the log andalong the bark side. The base surfaces further comprise a minor base surfacebs2, which is formed close to the pith and parallel with the major base surfacebs1 by tool 32.
The tools 31, 32 may be any type of tool capable of forming a planarsurface, including but not limited to milling cutters, circular saw blades orband saw blades. 7 The first tool 31, which forms the major base surface bs1, is arrangedto use the bark side as reference, such that the major base side bs1 is formedalong a direction parallel with the bark side.
The second tool 32, which forms the minor base surface bs2, isarranged to use the major base surface and/or the bark side as a reference,such that the minor base surface bs2 is formed along a direction parallel withthe major surface and/or the bark side.
The cross section of the lamellae 20a, 20b is trapezoidal having aconstant height. With the major base surface bs1 being formed substantiallyparallel with the bark, and with the log presenting a frusto-conical shape, it isrecognized that the major base surface bs1 will taper along the centraldirection of the log C. That is, the log will taper in a direction towards the topof the tree from which it was formed. This direction is also parallel with theprincipal fiber direction of the log and of the wood lamellae.
Moreover, the minor base surface bs2 will also taper along the centraldirection C of the log.
The fact that the radius of the log would also diminish towards the topof the tree from which it was formed, implies that while the amount of materialremoved at the bark side, by tool 31, in the forming of the major base sidesbs1 will be substantially constant along the length of the lamella 20a, 20b, asseen in the radial direction.
However, the amount of material removed at the pith side, by tool 32,will diminish towards as seen in the direction towards the top of the tree fromwhich the lamella 20a, 20b was formed.
Referring to Fig. 1d, after the lamellae 20a, 20b have been formed,each lamella will have a major and a minor base surface bs1, bs2 and a pairof side surfaces ss1, ss2, which will be identical.
Referring to Fig. 1e, every second lamella 20b will now be turned orflipped about 180° about its longitudinal axis and about 180° about an axisperpendicular to the longitudinal axis and perpendicular to the major basesurface bs1, such that the lamellae will become positioned as illustrated in 8 Fig. 1e. That is, the directions of taper Ca and Cb will extend in oppositedirections.
At this point, the base surfaces of every pair of adjacent wood Iamellae20a, 20b will taper towards substantially opposite directions. Moreover, majorbase surfaces bs1 of every pair of adjacent wood |ame|ae will facesubstantially opposite directions, i.e. one upwards in Fig. 1e and the otherone downwards in Fig. 1e.
At this point, the wood may still be “wet”, that is, its moisture contentmay be more than 25 % by dry mass, preferably more than 30 %. Hence, thewood has not been subjected to any accelerated or intentiona| drying, such askiln drying.
Fig. 1f schematically i|ustrates the two |ame|ae 20a, 20b whenarranged adjacent each other, side surface ss1 to side surface ss2 and withbase surfaces bs1, bs2 of the pair of thus adjacent |ame|ae 20a, 20b taperingin opposite directions.
Referring to Fig. 1g, there is i|ustrated a pair of glue applicators 33a,33b, which apply glue to side surfaces of lamellae 20a, 20b, respectively. Asingle, or even more, glue applicators may be used.
The |ame|ae are then arranged as i|ustrated in Fig. 1g, i.e. with thebase surfaces bs1, bs2 of every pair of adjacent wood Iamellae 20a, 20btapering towards substantially opposite directions and major base surfacesbs1 of every pair of adjacent wood Iamellae facing substantially oppositedirections.
The glue used is a glue adapted for wet gluing wood, such as a wateractivated glue. One example of such glue is a polyurethane (PU) based glue.
The Iamellae 20a, 20b will be subjected to a pressing tool 34 pressingthe |ame|ae 20a, 20b together in directions perpendicular to the basesurfaces 20a, 20b and/or parallel with base surfaces 20a, 20b andperpendicular to longitudinal axes C.
Figs 1h-1 k schematically illustrate a first way of processing the billet200. 9 As illustrated in Fig. 1h, after the gluing process, an intermediate woodproduct, here referred to as a “billet” 200 is provided, made up of woodIamellae 20a, 20b glued together first side surface ss1 to first side surface ss1and second side surface ss2 to second side surface ss2. ln the illustrated example, the bi|et 200 consists of a single layer ofIamellae 20a, 20b, which are arranged side surface to side surface and withmajor base surfaces bs1 of immediately adjacent Iamellae facing oppositedirections and with base surfaces bs1, bs2 of immediately adjacent Iamellaetapering in width in opposite directions.
Referring to Fig. 1i, the bi|et 200 may be divided by cuts 2012 into aplurality of wood pieces 201 having substantially rectangular or square crosssection and being of desired dimensions. These cuts 2012 may extend inplanes that are perpendicular to the base surfaces and parallel with theprincipal fiber direction C of the Iamellae 20a, 20b.
Each wood piece 201 will consist of parts of at least two Iamellae 20a,20b, frequently of three or more Iamellae, which are arranged such that basesurfaces bs1, bs2 every pair of adjacent wood Iamellae 20a, 20b tapertowards substantially opposite directions and major base surfaces bs1 ofevery pair of adjacent wood Iamellae face substantially opposite directions. Atleast one of the wood Iamellae 20a, 20b may present an incompletetrapezoidal cross section. The planks 201 may have a width corresponding to1-3, preferably 1-2 major base surfaces of the Iamellae 20a, 20b it is made upof. Moreover, the planks may have a thickness which is more than 50 % ofthe radius of the log from which the Iamellae were formed, preferably morethan 75 % of such radius, more than 80 % of such radius, more than 85 % ofsuch radius or even more than 90 % of such radius.
Referring to Fig. 1j, the wood pieces 201 may then be subjected to anaccelerated drying, such as kiln drying, so as to reduce their moisture contentto less than 20 % by dry mass, preferably less than 15 % by dry mass or lessthan 10 % by dry mass.
Referring to Fig. 1k, a pair, or more of the dried wood pieces 201 maybe provided with a joint, such as a fingerjoint 202, such that a plank of a desired length is provided, after which they can be used as constructionmaterial.
Such wood pieces or planks may be further formatted, such as planedon one or more sides thereof and/or profiled.
Areas of use for such wood pieces or planks include primarily structuralmembers, such as joists, beams, studs or pillars.
Fig. 2a is a schematic side view of a device 300 for producing woodlamellae 20a, 20b from a half-log 2'. The device comprises a groove cutter311 and a set 312 of radial cutters 321a, 321b, 321c, 321d and 321e.Moreover, the device 300 may comprise a conveyor arrangement 300a, 300b,300c for causing relative movement between the log and the cutters 311, 312.Typically, the log may be moved relative to stationary cutters 311, 312.However, it is also possible to provide cutters 311, 312, which are capable ofmoving along the length of the half-log 2'.
The half log 2' has typically been longitudinally cut in half prior to beingintroduced into the device 300. That is, the log has been cut longitudinallyalong a plane containing a central axis C of the log. The log may have beenpre-cut into an appropriate length, such as 1-10 m, preferably 1-5 m, 1-3 m or1-2 m. Moreover, the log may have been wholly or partially debarked. Hence,the log can be said to present a planar surface 22 and a convex surface 21.For practical reasons, the log may be conveyed with its planar surface facingdownwardly and oriented horizontally.
Fig. 2b is a cross sectional view taken along line A-A in Fig. 2a. ln Fig.2b, it is illustrated how the groove cutter 311 provides a longitudinal groove atthe central portion of the log, i.e. at the pith area.
The groove cutter 311 may be formed as a circular, rotatable cutterhaving a cutting edge with a cross section that corresponds to a desired crosssection of the groove 23.
The groove 23 formed by the groove cutter 311 may presents asubstantially concave surface, which may be substantially half circular, orwhich may be polygonal. 11 The groove cutter 311 may extend upwardly from a support on whichthe log is to be supported with its planar surface 22 facing downwardly.
Figs 3a-3c schematically illustrate another way of processing the billet200 formed at Fig. 1g and i|ustrated in Fig. 1h.
Fig. 3a i|ustrates a cutting scheme which differs from that disclosedwith respect to Fig. 1i. Here the vertical cuts 2012', i.e. cuts extendingsubstantially parallel with a principal fiber direction of the lamellae 20a, 20band perpendicular to the base surfaces bs1, bs2 have a greater spacing, suchthat wider planks 201' are provided.
Moreover, there is i|ustrated a horizontal cut 2013, i.e. a cut extendingsubstantially parallel with a principal fiber direction of the lamellae, but parallelwith the base surfaces bs1, bs2.
Based on one or more horizontal cuts 2013, it is possible to divide thebillet into two or more sheets, and/or it is possible to provide planks havingsmaller thickness. Each such plank 201' will then be formed of parts of two ormore lamellae having trapezoidal cross section.
However, while the cutting i|ustrated in Fig 1i provides wood pieces orwood planks 201 having a width corresponding to 1-2 major base surfacesbs1, the planks 201' provided in the sawing according to Fig. 3b may have awidth of 2-6 major base surfaces bs1, preferably 2-4 major base surfacesbs1.
At this point, the planks 201' may be subjected to an accelerateddrying process, such as kiln drying, as described with respect to Fig. 1j.
Before, or after the drying, planks 201' may be joined in an end-to-endmanner, as described with respect to Fig. 1k, thus forming extended planks.
Fig. 3b schematically i|ustrates a process of gluing together suchplanks 201' and/or extended planks base surface to base surface by applyingglue to the base surfaces. Such gluing may be a dry gluing. ln Fig. 3b, there is i|ustrated a glue applicator 36 which applies glue tothe surface of the wood pieces 201' (and/or fingerjointed beams/planks) thatis formed by the base surfaces bs1, bs2. The wood pieces 201' are then 12 glued together base surface bs1, bs2 to base surface bs1, bs2 as illustratedin Fig. 3b.
The wood pieces may be subjected to a pressing tool 37 pressing themtogether in directions parallel to the base surfaces and/or perpendicular tobase surfaces and perpendicular to Iongitudinal axes C.
A predetermined number of wood pieces 201' or planks may be gluedtogether in this manner to form e.g. a g|u|am beam 205.
Fig.3c schematically i|ustrates such a g|u|am beam 205, which hasbeen formed by the process described with respect to Figs. 3a-3c. That is, thebeam 205 is formed by a p|ura|ity of layers, which each comprise lamellae20a, 20b having trapezoidal cross section, which are glued together sidesurface to side surface. The layers are glued together base surface to basesurface. The layers may have substantially equal thickness, that is equalthickness +/- less than 10 %, preferably +/- less than 5 % or +/- less than 2%. Each layer may have a thickness which is 50 % or less of a radius of a logfrom which the lamellae making up the layers were formed, possibly 40 % orless or 30 % or less.
Figs 4a-4c schematically illustrate yet another way of processing thebillet 200 formed at Fig. 1g.Here, just like in Fig. 1i, the billet 200 is cut alongthe length direction C, perpendicular to the base surfaces and along theprincipal fiber direction of the wood lamellae 20a, 20b, into a p|ura|ity of woodpieces 201", by a saw 35, as illustrated in Fig. 4a. The saw may be of thesame type as the saw used for the cutting outlined with respect to Fig. 1i.
However, while the cutting illustrated in Fig 1i provides wood pieces orwood planks 201 having a width corresponding to 1-2 major base surfacesbs1, the planks 201” provided in the sawing according to Fig. 4b may have awidth of 2-6 major base surfaces bs1, preferably 2-4 major base surfaces bs1and a thickness which is more than 50 % of the radius of the log from whichthe lamellae were formed, preferably more than 75 % of such radius, or even more than 90 % of such radius. 13 After this cutting step, the thus produced wood pieces 201” may besubjected to accelerated drying, e.g. kiln drying, in the same manner as wasdescribed with respect to Fig. 1j.
After the drying step, it is possible to fingerjoint wood pieces 201” toform beams or planks of a desired length, as was described with reference toFig. 1k.
Optionally, the planks 201” may be formatted, such as planed on oneor more sides, before or after the finger jointing step. ln Fig. 4b, there is i|ustrated a glue applicator 36 which applies glue tothe surface of the wood pieces 201” (and/or fingerjointed beams/planks) thatis formed by the base surfaces bs1, bs2. The wood pieces 201” are thenglued together base surface bs1, bs2 to base surface bs1, bs2 as i|ustratedin Fig. 4b.
The wood pieces 201” are subjected to a pressing tool 37 pressingthem together in directions parallel to the base surfaces and/or perpendicularto base surfaces and perpendicular to longitudinal axes C.
A predetermined number of wood pieces 201” or planks may be gluedtogether in this manner to form e.g. a glulam billet 206.
The glulam billet 206 may be used as is, or, it may be cut into one ormore beams 207 as i|ustrated in Fig. 4c. That is, the billet 206 comprisinglamellae 20a, 20b having trapezoidal cross section, that are glued togetherboth side surface to side surface and base surface to base surface, may becut along plane that is parallel to the base surfaces and with the principal fiberdirection of the wood lamellae 20a, 20b. Such a beam 207 may comprise atleast two layers, preferably 2-5 layers, that have substantially the samethickness and one or two layers having a smaller thickness, e.g. having athickness which is 70 % or less than the thickness of the other layers, or even 50 % or less or 30 % or less.

权利要求:
Claims (15)
[1] 1. A method of forming a laminated wood product, which isadapted for receiving a load in a direction perpendicular to a principal fiberdirection of the wood, the method comprising: cutting a log (2) along the principal fiber direction of the log, into aplurality of wood lamellae (20a, 20b), such that the wood lamellae are formedas radial sections of the log, forming the wood lamellae (20a, 20b) to provide each wood lamellawith a trapezoidal cross section, whereby the wood lamellae present arespective planar major base surface (bs1) that is formed at a radially outerpart of the log (2) and a respective planar minor base surface (bs2) that isformed at a radially inner part of the log (2), arranging the lamellae (20a, 20b) as at least one layer in which planarmajor base surfaces (bs1) of immediately adjacent lamellae (20a, 20b) faceopposite directions, and gluing together the lamellae (20a, 20b) side surface to side surface(ss1, ss2) such that a wood billet is formed, characterized by arranging the wood lamellae (20a, 20b) such that the major basesurfaces (bs1) of immediately adjacent wood lamellae taper in oppositedirections, wherein the gluing comprises wet gluing.
[2] 2. The method as claimed in claim 1, wherein the formingcomprises a first forming step, in which the major base surfaces (bs1) areformed along the outermost part of the log, preferably along a direction whichis substantially parallel with the outermost surface of the log.
[3] 3. The method as claimed in claim 3, wherein the minor basesurfaces (bs2) are formed along a direction which, as seen in a planecontaining the pith, presents an angle relative to a pith direction, that is greater than an angle between the major base surface (bs1) and theoutermost surface of the log.
[4] 4. The method as claimed in any one of the preceding claims,wherein the forming comprises a second forming step, in which the minorbase surfaces (bs2) are formed by removal of material at a portion of therespective lamella, which is close to the pith, and wherein more of a height ofthe trapezoidal cross section is removed when forming the minor base surface than when forming the major base surface.
[5] 5. The method as claimed in any one of the preceding claims,wherein the cutting comprises cutting the wood lamellae to an apex angle ofless than 45°, preferably less than or equal to 40°, less than or equal to 36° orless than or equal to 30°.
[6] 6. The method as claimed in any one of the preceding claims,wherein arranging the lamellae comprises arranging the lamellae as a single layer, with base surfaces (bs1, bs2) exposed.
[7] 7. The method as claimed in any one of the preceding claims,wherein the arranging comprises turning every second lamella 180° about itslongitudinal axis and 180° about an axis which is perpendicular to thelongitudinal axis and perpendicular to its base surfaces (bs1, bs2).
[8] 8. The method as claimed in any one of the preceding claims,further comprising cutting the billet along a plane which is parallel to theprincipal fiber direction, and preferably perpendicular to the base surfaces(bs1, bs2), thus forming a plurality of planks.
[9] 9. The method as claimed in claim 8, further comprising subjectingthe planks to a drying step, such as a kiln drying. 16
[10] 10. The method as claimed in claim 9, further comprising joiningtogether at least two of the dried planks in an end-to-end manner, such that alonger plank is formed.
[11] 11. laminating together at least two dried planks and/or joined-together planks by The method as claimed in claim 9 or 10, further comprising gluing base surface (bs1, bs2) to base surface (bs2, bs1).
[12] 12. direction perpendicular to a principal fiber direction of the wood, comprising: A laminated wood product, adapted for receiving a load in a at least two glued-together wood lamellae (20a, 20b), which are formedas radial sections of a log, each having a lamella cross section which isparallel with a cross section of the wood product and a longitudinal direction(C) which is parallel with a longitudinal direction of the wood product and witha principal fiber direction of the wood lamellae (20a, 20b), wherein the lamellae (20a, 20b) present cross sections which aretrapezoidal and present a respective planar major base surface (bs1) that isformed at a radially outer part of the log and a respective minor base surface(bs2) that is formed at a radially inner part of the log, wherein the lamellae (20a, 20b) are arranged as at least one layer inwhich major base surfaces (bs1) of immediately adjacent lamellae (20a, 20b)face opposite directions, wherein the major base surfaces (bs1) of immediately adjacent woodlamellae taper in opposite directions, and wherein the wood lamellae (20a, 20b) are glued together by a glue suitable for wet gluing.
[13] 13. The laminated wood product as claimed in claim 12, wherein thelamellae (20a, 20b) are arranged as a single layer, with the base surfaces (bs1, bs2) exposed. 17
[14] 14. The Iaminated wood product as claimed in claim 12, wherein theIamellae are arranged as at least two Iayers, which are glued together base surface to base surface.
[15] 15.wood products as claimed in any one of claims 12-14, which are joined An elongate wood member comprising at least two Iaminated together end-to-end.

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同族专利:

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公开号 | 公开日

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CA2988513A1|2016-12-22|

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UA123993C2|2021-07-07|

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EP3310541B1|2021-11-17|

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JP2018526241A|2018-09-13|

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EA201890083A1|2018-05-31|

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JP6811192B2|2021-01-13|

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AU2016280249A1|2017-12-14|

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EP3310541A4|2019-02-27|

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CN107735233B|2021-11-02|

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US10589441B2|2020-03-17|

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US20180154547A1|2018-06-07|

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EA036506B1|2020-11-18|

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SE541538C2|2019-10-29|

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WO2016203416A1|2016-12-22|

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CN107735233A|2018-02-23|

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AU2016280249B2|2021-05-27|

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EP3310541A1|2018-04-25|

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法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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SE1550853A|SE541538C2|2015-06-18|2015-06-18|Method of producing a laminated wood product, and laminated wood products|SE1550853A| SE541538C2|2015-06-18|2015-06-18|Method of producing a laminated wood product, and laminated wood products|

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US15/579,635| US10589441B2|2015-06-18|2016-06-16|Method of producing a laminated wood product, and laminated wood products|

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CN201680035561.2A| CN107735233B|2015-06-18|2016-06-16|Method for producing laminated wood product, and laminated wood product|

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CA2988513A| CA2988513A1|2015-06-18|2016-06-16|Method of producing a laminated wood product, and laminated wood products|

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EA201890083A| EA036506B1|2015-06-18|2016-06-16|Method of producing a laminated wood product, and laminated wood products|

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PCT/IB2016/053566| WO2016203416A1|2015-06-18|2016-06-16|Method of producing a laminated wood product, and laminated wood products|

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JP2017565100A| JP6811192B2|2015-06-18|2016-06-16|Manufacturing method of laminated wood products and laminated wood products|

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AU2016280249A| AU2016280249B2|2015-06-18|2016-06-16|Method of producing a laminated wood product, and laminated wood products|

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UAA201800477A| UA123993C2|2015-06-18|2016-06-16|Method of producing a laminated wood product, and laminated wood products|

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EP16811121.9A| EP3310541B1|2015-06-18|2016-06-16|Method of producing a laminated wood product, and laminated wood products|