• 专利附录
  • 专利说明
  • 权利要求
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    • 专利摘要:
    14 ABSTRACT A Veneer comprising a sheet of Wooden material, having a recess pattern isprovided. The recess pattern comprises a number of recesses Which are aligned in rows,Wherein each recess has an elongated shape Which extends lengthwise the grain of thesheet of Wooden material, Wherein the distance between two successive recesses is less than the length of each recess. Figure to be published With the abstract: Fig. 2
    公开号:SE1050127A1
    申请号:SE1050127
    申请日:2010-02-08
    公开日:2011-08-09
    发明作者:Lars Andersson
    申请人:Paalskog Teknik Ab；
    IPC主号:
    专利说明:

    lO VENEER FOR THREE DIMENSIONAL BENDING, SYSTEM, AND METHODTHEREFOR.
    Field of the Invention This invention pertains in general to the field of veneers. More particularly theinvention relates a veneer suitable for bending in three dimensions around a point in theveneer, such as to be a part of furniture, and a system and method for manufacturing said veneer.
    Background of the Invention Veneer is per definition a relatively thin sheet of wood material, which often isglued or by other means fixated on a panel to create an aesthetically attractive surface.Typically, the thickness of a veneer material lies in the range of 0 to 5 mm. However, inother applications veneer may be used to form a rigid construction of e. g. fumiture,including a later covering by a surface coating. One such example is plywood, which isa planar construction of several layers of veneer being glued together.
    In the field of woodwork, forrning is a crucial process for allowing the creationof fumiture or other objects not only including straight angles. Consequently, differentmethods for forrning veneer are known.
    GB840640 discloses a veneer, which is curved in more than one direction.GB840640 further shows that a number of slots are provided in each of the veneerlayers, which slots enable for bending of the veneer in order to form a seat back. Aproblem with GB840640 is that the slot provided veneer is only dimensioned, and thussuitable for only one single species of furniture, with regard to shape and size, which inthis case is a specific seat back.
    Hence, an improved veneer, suitable for several types of fumiture would be advantageous.
    Summary of the Invention Accordingly, the present invention preferably seeks to mitigate, alleviate oreliminate one or more of the above-identified deficiencies in the art and disadvantagessingly or in any combination and solves at least the above-mentioned problems byproviding a veneer, and a system and method for manufacturing such veneer according to the appended patent claims. lO An object of the invention is to overcome the disadvantages and problems ofprior art. Another object is to provide a veneer that may be forrned by three-dimensionalbending.
    An idea according to the present invention is to provide a veneer having apattemed surface that allows the veneer to be forrned into an arbitrary shape.
    According to a first aspect of the invention, a veneer is provided. The veneercomprises a sheet of wooden material, wherein said sheet of wooden material comprisesa number of recesses which are aligned in at least one row, wherein each recess has anelongated shape which extends lengthwise the grain direction of the sheet of woodenmaterial. The distance between two successive recesses in a recess row is less than thelength of each recess.
    According to a second aspect a system for processing a veneer is provided. Thesystem comprises a feeding line configured to transport a sheet of wooden materialbetween an inlet and an outlet via a first roller having a plurality of protrusions whichare aligned in rows wherein the distance between two successive protrusions in eachrecess row is less than the length of each protrusion, whereby the first roller by meansof rotation is configured to imprint the veneer, thereby creating recesses, correspondingto the plurality of protrusions, in the veneer.
    According to a third aspect a system for processing a veneer is provided. Thesystem comprises a feeding line configured to transport a sheet of wooden materialbetween an inlet and an outlet via a pressing area, a master stamp having a plurality ofprotrusions which are aligned in rows wherein the distance between two successiveprotrusions in each recess row is less than the length of each protrusion, and pressingmeans conf1gured to press said master stamp onto said sheet at said pressing area, suchthat the protrusions are transferred as recesses in said sheet.
    According to a fourth aspect a method for processing a veneer is provided. Themethod comprises providing a sheet of wooden material, aligning said sheet to a roller,said roller having a plurality of protrusions which are aligned in rows wherein thedistance between two successive protrusions along a recess row is less than the lengthof each protrusion, and creating a plurality of recesses in the veneer by rotation of theroller comprising the plurality of protrusions over said veneer.
    According to a fifth aspect a method a method for processing a veneer isprovided. The method comprises providing a sheet of wooden material, aligning saidsheet to a master stamp, said master stamp having a plurality of protrusions which are aligned in rows wherein the distance between two successive protrusions is less than the lO length of each protrusion, and pressing said master stamp onto said sheet such that theprotrusions are transferred as recesses in said sheet.
    According to a sixth aspect a holder for holding at least two veneer before andduring three dimensional bending.
    According to a seventh aspect a rigid construction comprising the processed veneer is provided.
    Brief Description of the Drawings These and other aspects, features and advantages of which the invention iscapable of will be apparent and elucidated from the following description ofembodiments of the present invention, reference being made to the accompanyingdrawings, in which Fig. 1 is a schematic illustration showing the concept of arc height.
    Fig. 2 is a schematic top view of a veneer having a recess pattern according toan embodiment; Fig. Sa is a veneer comprising a symmetrical recess pattern according to anembodiment; Fig. 3b is a veneer comprising an asymmetrical recess pattern according to anembodiment; Fig. 4 is a schematic top view of a veneer having a recess pattern according toan embodiment; Fig. 5 is a cross-sectional view of a veneer according to an embodiment; Fig. 6 illustrates a system for processing a veneer according to an embodiment; Fig. 7 illustrates a cut out of a roller according to an embodiment; Fig. 8 illustrates a roller according to an embodiment; Fig. 9 illustrates a system for processing a veneer according to an embodiment; Fig. 10 illustrates a system for processing a veneer according to anembodiment; and Fig. 11 illustrates a holder for a stack of veneers according to an embodiment.
    Description of embodiments Several embodiments of the present invention will be described in more detailbelow with reference to the accompanying drawings in order for those skilled in the artto be able to carry out the invention. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth lO herein. Rather, these embodiments are provided so that this disclo sure will be thoroughand complete, and will fully convey the scope of the invention to those skilled in the art.The embodiments do not limit the invention, but the invention is only limited by theappended patent claims. Furthermore, the terrnino lo gy used in the detailed descriptionof the particular embodiments illustrated in the accompanying drawings is not intendedto be limiting of the invention.
    The following description focuses on embodiments applicable to a veneersuitable for bending in three dimensions around a point in the veneer, a roller forprocessing the veneer, and a method of producing said veneer.
    It is an object of the invention to provide a veneer and/or a stack of veneerswhich enables three dimensional bending around a point at the surface of the veneer ortop/bottom surface of the stack of veneers.
    Arc height is a parameter which may be used to define the magnitude of thethree dimensional bending. In general terms, in three dimensional applications, the archeight defines how much a surface may be bent around a point without breaking.
    One could also define the arc height as the perpendicular distance between aplane intersecting the boundaries of a round object, such as a sphere, and the objectboundary, at the middle point of the area defined by the plane and the intersectingboundaries of the object. When the round object is a sphere, the arc height in relation tothe diameter of the circle formed along the boundary at the intersection of the plane maydefine the magnitude of the three dimensional bending. Hence, the higher arc heightvalue, while keeping the circle diameter constant will render a higher magnitude ofthree dimensional bending. Throughout the description the terms arc height and bendingcurvature are used analogously and are both intended to define the magnitude of thethree dimensional bending around a point at the veneer, or a point at the top or bottomof the stack of veneers.
    Hence it is an object of the invention to provide a veneer and/or stack ofveneers which allow for as large arc height as possible.
    For illustrative purposes Fig. l illustrates the concept of arc height AH in threedimensions. In Fig. l the arc height AH is shown for a half, hollow ellipsoidal bodyhaving a first diameter dl and a second diameter d2. In the case the first diameter equalsthe second diameter the half ellipsoid is a half sphere. It should be appreciated that inreality the curvature of the veneer does strictly has to follow the curvature of an ellipsoid or sphere, since this explanation is merely for explanatory purposes. lO In an embodiment, according to Fig. 2, a wood veneer 10 is provided. Theveneer comprises a number of recesses 11a, 11b, 12a, 12b which are aligned in rows 11,12, etc. Each recess has an elongated shape which extends lengthwise the grain of the wood veneer.
    Recess pattem - dimensions & sizes The veneer comprises a recess pattern. According to an embodiment, thedistance Lb between two successive recesses 11a and 11b, or 12a and 12b is less thanthe length of each recess 11a, 11b, 12a, 12b. Thereby, the major part of an area of eachrow, i.e. an area forrned by the row length, i.e. physical length of the veneer along thegrain direction, times the width of each recess, comprises recesses.
    Furtherrnore, each of the two ends of each recess overlaps each transversallyneighboring recess. Hence, a first end of each recess overlaps each neighboring recess,by a distance denoted Lo1 as is indicated in Fig. 2. The second end of each recessoverlaps each neighboring recess by a distance denoted Lo2. The length L of each recess may thus be defined as: L=Lo1+Lo2+Lb Hence, this means that the areas on every recess row having no recesses, whichare denoted with a distance Lb, in Fig.1 are phase shifted with the corresponding areasof each neighboring recess row.
    In an embodiment the overlapping is symmetrical, i.e. Lo1=Lo2 rendering L =2Lo1 + Lb = 2Lo2 + Lb.
    The symmetrical overlapping is preferred in some applications since such apattern provides the veneer with a symmetrical bending rigidity. Such a symmetricalrecess pattern configuration is shown in Fig. 3a.
    In a typical forming process such as three-dimensional bending, both sides ofthe veneer will be subject to compression forces as well as strain forces. The recessesmay thus absorb the compression forces, while the area of the veneer not covered byrecesses may absorb the strain forces.
    In an embodiment the overlapping is asymmetrical, i.e. Lo17íLo2, while bothLo1 and Lo2 is larger than 0. Such an asymmetrical recess pattem configuration isshown in Fig 2, and Fig. 3b. An asymmetrical recess pattem may be advantageous when an asymmetrical end shape of the veneer is desired.
    An asymmetrical recess pattern may e.g. be provided when utilizing twosuccessive rollers, for providing the recess pattern on the veneer, where the first rollercomprises protrusions corresponding to each recess for every second recess row, eg.row ll and row 13 in Fig. 2, and the second roller comprises protrusions correspondingto each recess for every second recess row, e.g. 12 and 14 in Fig. 2.
    The recess pattern measures set out throughout the present specification areexemplary measures that may be used for veneers used in furniture, such as chairs,sofas, etc. However, it should be appreciated that other measures may be useddepending on the application.
    The length L of each recess may be selected based on the desired bendingcurvature of the veneer or stack of veneers. According to an embodiment, the recesslength (L) may be approximately 30 mm.
    The distance Lb between two successive recesses lla, llb, 12a, 12b, in arecess row 11, 12, 13 is selected based on the desired bending curvature of the veneer orstack of veneers. For example, the distance Lb may be approximately 10 mm.
    The width of each recess may be selected based on the desired bendingcurvature of the veneer, which is due to the fact that the larger width, the better ability tobend the veneer. However, a too large width may be result in unintentional breaking ofthe veneer during bending. In an embodiment, the width of each recess at each recessrow may vary between 0,1 mm to 3 mm, such as 0,5 mm to 1 mm.
    The perpendicular distance between two recess rows, i.e. the centre to centredistance between each recess row, may be also be selected based on the desired bendingcurvature of the veneer. For example, the centre to centre distance may beapproximately 4 - 5 mm.
    In an embodiment, each recess has the shape of a triangular prism, wherein thebase of the prism is arranged at the surface of the veneer such that the apex is formed atthe bottom of the recess.
    Fig. 4 illustrates a veneer having a recess pattem, wherein each recess at thesurface of the veneer, i.e. seen from a top view, has the shape of an ellipsoid.
    In an embodiment, each recess of the recess pattem has a cylindrical shapeextending into the veneer. Hence, each recess at the surface of the veneer, i.e. seen froma top view, has a circular shape. In this way each recess extends equally in along thegrain direction as in the direction perpendicular to the grain direction of the veneer.
    In an embodiment, each recess of the recess pattem has a conical or frusto- conical shape extending into the veneer. Hence, each recess at the surface of the veneer, i.e. seen from a top view, has a circular shape. In this way each recess extends equally inalong the grain direction as in the direction perpendicular to the grain direction of theveneer.
    Fig. 5 illustrates a cross-sectional side view of a veneer according to anembodiment, wherein each recess has a triangular cross-sectional shape, whereby the entire shape of the veneer may be triangular prism shaped.
    Providing the recess pattern onto the veneer A veneer according to what has previously been described may be processedby a method, comprising the steps of providing a sheet of wooden material, aligningsaid sheet to a roller 51, said roller having a plurality of protrusions which are aligned inrows wherein the distance between two successive protrusions along a recess row is lessthan the length of each protrusion, and creating recesses in the veneer by rotation of theroller 51 over said veneer.
    The recess pattem may be provided onto the veneer, using various techniques.
    In an embodiment, according to Fig. 6, the recess pattem may be provided ontothe veneer by means of a roller 51 having a number of protrusions 11a', 1 lb'corresponding to the desired recesses 11a, 11b in the veneer 10. The roller 51 may bemade of steel.
    Optionally the roller 51 may be positioned above a conveyor belt 91, as isshown in Fig. 10, at a distance from the conveyor belt suitable for introducing a veneerthere between. A veneer traveling on the conveyor belt 91 may be provided with therecess pattem by rotation of the roller 51 having the conveyor belt 91 as counter force.Optionally, the rotation of the roller 51 is performed using a motor (not shown).However in an embodiment, due to the driving of the conveyor belt 91 the roller 51 mayrotate freely without any connection to a motor, and still provide the recess pattem intothe veneer.
    The system for providing a recess pattem onto the veneer 10 may furthercomprise a second roller 52 for supporting the veneer. The axis of the second roller isparallel with the first roller 51. The second roller 52 may be positioned such that theveneer is able to enter a space between the two rollers, whereby the first roller imprintsthe recess pattem into the veneer based on counterforce made by the second roller 52.The roller 51, the second roller 52 or both may be driven by a motor (not shown) suchas to rotate, e. g. in the directions indicated by arrows in Fig. 6. In an embodiment, only the roller 51 is driven by the motor. lO Fig. 7 illustrates a cut out of a roller 51 according to an embodiment, whereinthe roller 51 is threaded, and wherein each thread represents a recess row 11, 12. It maybe observed from Fig. 7 that the protrusions on the roller 51 are triangular prism shaped,and that the surface with no protrusions along each recess/protrusion row, which isindicated by the distance Lb, are essentially flat. The essentially flat surface may beprovided e. g. by milling away portions of the thread in a suitable manner. This isadvantageous in that the roller 51 may be manufactured in a very cost efficient way,hence resulting in a very cost efficient veneer. In Fig. 7 the width of the base of eachprotrusion is approximately 4 mm, and the height of each protrusion with reference tothe surface with no protrusions along each recess/protrusion row is 2,5 mm - 4mm.
    Fig. 8 illustrates the roller 51 seen from an angle. In an embodiment the roller51 is not threaded, whereby each recess/protrusion row of the roller def1nes a closedloop.
    A second altemative way of providing the recess pattem into the veneer is bymilling.
    According to an embodiment, the depth of each recess of the recess pattem inthe veneer is less than the depth of the veneer.
    According to an embodiment, each or at least one recess of the recess pattem inthe veneer may be provided as a through-ho le.
    According to a yet further embodiment, the recesses may be provided by a flatmaster stamp 81, as is shown in Fig. 9. In such an embodiment, the method ofprocessing the veneer may comprise providing a sheet of wooden material, aligning saidsheet to a master stamp, said master stamp having a plurality of protrusions which arealigned in rows wherein the distance between two successive protrusions in one recessrow is less than the length of each protrusion, and pressing said master stamp onto saidsheet such that the protrusions are transferred as recesses in said sheet. The veneer maythus be manufactured according to said method by means of a system comprising afeeding line conf1gured to transport a sheet of wooden material between an inlet and anoutlet via a pressing area, a master stamp having a plurality of protrusions which arealigned in rows wherein the distance between two successive protrusions is less than thelength of each protrusion, and a pressing means configured to press said master stamponto said sheet at said pressing area, such that the protrusions are transferred as recesses in said sheet. lO In such method, the width of each recess may be deterrnined by controlling thepressure at which the master stamp is pressed onto the sheet. Consequently, a greater pressure will cause deeper recesses.
    Applicabilitv of the recess pattemed veneer The recess pattemed veneer may be used to form a rigid construction of e. g.fumiture, including a later covering by a surface coating, and particularly an at leastpartly three dimensionally bent rigid construction. In order to create a rigid constructionseveral layers, i.e. a stack, of recess pattemed veneers may be glued together.Depending of the application the grain direction, and thus recess direction, between twoneighboring veneers may differ.
    For example, in some applications each veneer may have a grain directionessentially perpendicular to the grain direction of its neighbors. In other applications, amajority of the veneers in the stack may have a grain direction essentially in the samedirection.
    During compression mo lding of the stack, especially when the mold comprisesthree dimensional bends around a point therein, there is a risk that the crosscut end ofeach veneer may crack due to the intrinsic forces.
    In order to alleviate this risk, the crosscut end of each veneer may be providedwith an adhesive tape which encompasses the crosscut end edge.
    To secure the stack of veneers before and during the three dimensionalbending, a tape may be applied around the stack edges. By applying a tape around theedges of the stack before three dimensional bending the veneers of the stack are betterprevented from fo lding during the three dimensional bending.
    In an embodiment, according to Fig. ll, a holder l0l for keeping the stackedges together is provided. The holder may be made of a flexible material. The holdermay be C-shaped, whereby it acts as an elongated clamp around the stack edge. Theusage of such a holder may be preferred since no tape around the stack ends is needed.
    For example, such a holder may consist of a cylindrical tube, which has been cut lengthwise such as to create a C-shaped cross-section.
    Magnitude of 3D bendingThe present inventors have been able to provide a durable stack of veneersallowing for an arc height of 15 mm for a diameter of 200 mm, i.e. that the veneer may be . This arc height value was achieved using a symmetrical recess pattem having the following parameter values: L = 30mm, recess width = 1,5 mm, recess depth = l,5mm,Lb = 10mm, c-t-c recess row = 5 mm.
    Even though certain example measures of the recess pattem has been specifiedin the description above, it should be appreciated that also other measures could apply,depending on the type and shape of rigid construction. However, it should beappreciated that the distance Lb should always be less than the length L of each recessalong the grain direction. Moreover, it should be appreciated that Lol and Lo2 is largerthan 0 mm.
    Although the present invention has been described above with reference tospecific embodiments, it is not intended to be limited to the specific form set forthherein. Rather, the invention is limited only by the accompanying claims and, otherembodiments than the specific above are equally possible within the scope of theseappended claims.
    In the claims, the term "comprises/comprising" does not exclude the presence of other elements or steps. Furthermore, although individually listed, a plurality of means, elements or method steps may be implemented by e. g. a single unit or processor.
    Additionally, although individual features may be included in different claims, thesemay possibly advantageously be combined, and the inclusion in different claims doesnot imply that a combination of features is not feasible and/or advantageous. Inaddition, singular references do not exclude a plurality. The terms "a", "an", “first”,“second” etc do not preclude a plurality. Reference signs in the claims are providedmerely as a clarifying example and shall not be construed as limiting the scope of the claims in any way.
    权利要求:
    Claims (18)
    [1] 1. A Veneer (10) for three dimensional bending, comprising, a sheet of wooden material (10), wherein said sheet of wooden material (10)comprises a number of recesses (l la, llb, l2a, l2b) which are aligned in at least onerow (11, 12, 13, 14), wherein each recess has an elongated shape which extendslengthwise the grain direction of the sheet of wooden material, characterized in thatthe distance (Lb) between two successive recesses (l la, llb, 12a, 12b) in a recess row(11, 12, 13, 14) is less than the length (L) ofeach recess (1 la, llb, 12a, 12b).
    [2] 2. The Veneer (10) according to claim l, wherein each recess (l la, llb, 12a,12b) comprises a first end and a second end, wherein the first end of each recess (l la,llb, 12a, 12b) oVerlaps each neighboring recess (1 la, llb, 12a, 12b), by a first distance(Lol), and the second end of each recess (1 la, llb, 12a, 12b) overlaps each neighboringrecess (1 la, llb, 12a, 12b) by a second distance (Lo2).
    [3] 3. The Veneer (10) according to claims 2, wherein the length of each recess(l la, llb, 12a, 12b) may be defined as L=Lol+Lo2+Lb.
    [4] 4. The Veneer according to claims 2, or 3, wherein the first distance (Lol) equals the second distance (Lo2).
    [5] 5. The Veneer according to claims 2, or 3, wherein the first distance (Lol) is not equal to the second distance (Lo2).
    [6] 6. The Veneer according to any one of the proceeding claims, wherein the depth of each recess (l la, llb, 12a, l2b) is less than thickness of said Veneer.
    [7] 7. The Veneer according to any one of claims l to 5, wherein each recess (l la, l lb, 12a, 12b) is extending through the Veneer.
    [8] 8. Aproduct comprising at least two Veneers according to any one of claims l to 7, wherein the at least two Veneers are attached to each other by means of gluing. 12
    [9] 9. A system for processing a veneer according to any one of claims 1 to 7,comprising a feeding line configured to transport a sheet of wooden material (10) betweenan inlet and an outlet via a first roller (51) having a plurality of protrusions which arealigned in rows wherein the distance between two successive protrusions in each recessrow (11, 12, 13, 14) is less than the length of each protrusion, whereby the first roller(51) by means of rotation is configured to imprint the veneer, thereby creating recesses(1 la, 1 lb, 12a, 12b), corresponding to the plurality of protrusions, in the veneer (10).
    [10] 10. The system according to claim 9, wherein the feeding line comprises a conveyor belt (91).
    [11] 11. The system according to claim 9, further comprising a second roller (52) for supporting the veneer, wherein said second roller (52)is positioned such that the veneer is able to enter a space between the first (51) andsecond (52) roller, and whereby the veneer is imprinted based on rotation of the first roller (51) in conjunction with a counterforce applied by the second roller (52).
    [12] 12. A system for processing a veneer according to any one of claims 1 to 7,comprising a feeding line configured to transport a sheet of wooden material (10) betweenan inlet and an outlet via a pressing area, a master stamp (81) having a plurality of protrusions which are aligned in rowswherein the distance between two successive protrusions in each recess row (11, 12, 13,14) is less than the length of each protrusion, and pressing means configured to press said master stamp onto said sheet at said pressing area, such that the protrusions are transferred as recesses in said sheet.
    [13] 13. The system according to claims 9, 10, 11, or 12, further comprising acompression mo lding means for bending the veneer in three dimensions around a point thereon. .
    [14] 14. A method for processing a veneer, comprising providing a sheet of wooden material (10), 13 aligning said sheet to a roller (51), said roller having a plurality of protrusionswhich are aligned in rows wherein the distance between two successive protrusionsalong a recess row (11, 12, 13, 14) is less than the length of each protrusion, and creating a plurality of recesses in the veneer by rotation of the roller (51) comprising the plurality of protrusions over said veneer.
    [15] 15. A method for processing a veneer, comprising the steps of: providing a sheet of wooden material (10), aligning said sheet to a master stamp, said master stamp having a plurality ofprotrusions which are aligned in rows wherein the distance between two successiveprotrusions is less than the length of each protrusion, and pressing said master stamp onto said sheet such that the protrusions are transferred as recesses in said sheet.
    [16] 16. The method according to claims 14 or 15, further comprising compressionmolding said veneer (10), thereby bending the veneer (10) in three dimensions around a point thereon.
    [17] 17. A holder (101) for the product according to claim 8 for holding the product before and during three dimensional bending.
    [18] 18. A rigid construction comprising the veneer according to any one of claims 1to 8.
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    法律状态:
    2020-09-29| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE1050127A|SE535051C2|2010-02-08|2010-02-08|Veneers for three-dimensional bending, systems and ways|SE1050127A| SE535051C2|2010-02-08|2010-02-08|Veneers for three-dimensional bending, systems and ways|
    EP11740119.0A| EP2533956A4|2010-02-08|2011-02-08|Veneer for three dimensional bending, system, and method therefor|
    PCT/SE2011/050142| WO2011096886A1|2010-02-08|2011-02-08|Veneer for three dimensional bending, system, and method therefor|
    CN201180017659.2A| CN102933358B|2010-02-08|2011-02-08|For the veneer of three-dimensional bending, system and method thereof|
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