• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    SUMMARY The invention relates to a method of manufacturing a wood chipboard (3) comprising a first (21) and second (23) wood chip layers interposing an intermediate layer (12) comprising wood chips of another chip size than the first (21) and second (23) wood chip layers. The method comprises the steps of applying a first amount (5) of glued wooden buckles (7) to a lower tool surface (9) of a press tool (1, 31); applying a filling amount (11) of wood chips (7 ') to the first amount (5); applying a second amount (13) of glued wood chips (7) to the filling amount (11); compressing said quantities (5, 11, 13) by means of the lower (9) tool surface and an upper tool surface (15); providing differentiated times when the adhesive with the glued wood shavings (7) hardens in the first (5) and second (13) amounts, respectively, by providing these amounts with different thicknesses and / or by heating the respective amounts (5, 13) to different temperatures; and removing the hardened wood clamping disc (3) from the pressing tool (1, 31). (Fig. 4)
    公开号:SE0950018A1
    申请号:SE0950018
    申请日:2009-01-20
    公开日:2010-07-21
    发明作者:Bo Nilsson
    申请人:Swedwood Internat Ab；
    IPC主号:
    专利说明:

    It is also proposed that particle board be stored between boards in veneer, where the upper veneer board is thicker than the lower one.
    The object of the present invention is to further develop the idea of the convex curvature, but through a chipboard with a different structure.
    A task of the invention is to provide a chipboard which can be manufactured convex in a simple manner (and in which the convexity can be controlled effectively), and which has good properties to withstand loads facing the load-bearing side of the chipboard.
    It is also desirable to be able to keep the considerable manufacturing equipment that currently exists at a production line, without any costly effort.
    Prior art process equipment, inefficient handling of process equipment in suffering from disadvantages, such as the complicated manufacturing process, the lack of flexibility at a production line, long pressing / gluing time, etc.
    It is also desirable that the finished chipboard is simple in its construction, has low weight and is rigid in shape.
    SUMMARY OF THE INVENTION The problem is solved by the wood chipboard described in the introduction, which is characterized by the features stated in claim 1. In this way a wood chipboard has been provided by simple means, the ratio of the thicknesses of the first and second wood chip layers) needs to be adjusted to create a convex curvature in a wood chip board. By convex wood chipboard is meant that the outer surface of the wood chipboard, corresponding to the outer surface of the first wood chip layer, is concave, and that the second facing outer surface of the wood chipboard, corresponding to the outer surface of the second wood chip layer, is convex. The convex wood chipboard can also be defined by the curvature of the first wood chip layer in space having a smaller radius than the curvature of the second wood chip layer. The convex curvature of the wood chipboard is achieved towards the load-bearing side.
    The wood chipboard can be cut to suitable widths to form overstretched shelves where the first wood chip layer is turned downwards. A shelf with a length of 700-800 mm is preferably provided with an arc height above the chord of approximately 1.5-2 mm by adapting the thickness of the first wood chip layer to the thickness of the second wood chip layer. Experiments made by the applicant have shown that a ratio of 75-80% thickness of the first wood chip layer to 20-25% thickness of the second wood chip layer (where 100% is the total strength of the first and second wood chip layers together) gives a satisfactory arc height and satisfactory resistance to forces seeking to deflect the shelf. An arc height of 1.5-2 mm for such a shelf does not affect the aesthetic impression either. When the shelf surface is loaded, a deflection will take place, but due to the greater compressive and tensile strength of the thicker first layer, the shelf surface will be able to withstand this load to a great extent and will not bend significantly. A deflection from the chord of 1.5-2 mm does not give an effect on the aesthetic impression here either. Thus, the shelf can be loaded so much that the total maximum deflection distance (arc height plus deflection) can be as much as 3-4 mm without affecting the aesthetic impression.
    Preferably, the first wood chip layer is about four times more powerful than the second wood chip layer.
    By means of a great arch height and great compressive and tensile strength of the first wood chip layer thereby obtained, a greater load can be exerted on the wood chip board. Likewise, the wood chipboard in humid climates could withstand deflection in a satisfactory manner because a humid external environment in itself can make the wood chipboard softer and thus less resistant to deflection.
    Preferably, the first wood chip layer is about three times more powerful than the second wood chip layer.
    Due to this ratio with distribution of the amount of wood chips in the first and second wood chip layers, an optimal arc height is achieved to withstand unloading, while the second wood chip layer can withstand impact and mechanical action in a satisfactory manner.
    Preferably, the chips are not oriented in the longitudinal direction in the respective layers of the finished wood chipboard, but the chips are arranged in a number of different directions. This builds up strength in all directions.
    Preferably, the wood chipboard is coated with a surface layer.
    In this way, by applying plastic film or board veneer to the outer surface / surfaces of the wood chipboard, the wood chipboard can be made further resistant to deflection.
    Preferably, the wood chips in the intermediate layer have a coarser chip size than in the first and second wood chip layers.
    Thereby a wood chipboard can be produced which is light at the same time as it exhibits a good resistance to deflection / allows a relatively large deflection distance. Preferably, a shelf is made of a wood chipboard according to any one of claims 1 to 5, wherein the upper surface of the shelf is arranged to receive articles, such as books, is convex.
    In this way, a shelf has been created which ensures an aesthetic impression over time even when a large load is exerted on the shelf from above for a long time. A shelf, which rests on supports attached to both gables of a bookshelf, must be as straight as possible when placing books on the shelf. Otherwise, the aesthetic impression would be affected. The shelf plane must thus be able to withstand forces which strive to bend the shelf piano. This is ensured by such a shelf.
    The problem is also solved by the method described in the introduction, which is characterized by the steps stated in claim 7.
    One embodiment means that the second amount of glued wooden buckles is applied to the filling amount in such a way that the thickness of this second amount by means of distribution means becomes greater or less than the thickness of the first amount. By the method of producing one of the surface layers (the first wood chip layer comprising the first amount of wood chips or the second wood chip layer comprising the second amount of wood chips) with greater thickness than the second surface layer, after the removal of the wood chip board from the press tool, an overstretched wood chip board is provided. The larger amount of wood buckles is given a greater density after the compression of the quantities during manufacture. the pressing step compresses the first amount, which is more powerful than the second amount, by means of a lower tool surface and the filling amount itself (that is, the intermediate layer automatically acts as a tool surface because the second amount is thinner than the first amount and the more powerful the first quantity must be compressed over a longer distance). The filling amount thus acts as an abutment.
    Thus, the density becomes larger in the more powerful layer, which in turn gives a This is done by at + + 15 15 25 greater tensile strength and compressive strength (strength) in the more powerful layer than in the thinner one. The thicker surface layer naturally comprises, in addition to a larger amount of wood chips, a larger amount of glue than the thinner surface layer. In the compression step, the more powerful surface layer is compressed by means of the tool surfaces, while at the same time the amount of filling (intermediate glued wood chips) acts as an abutment. At the same time, this phenomenon is achieved in that the more powerful surface layer can be more easily compressed due to the larger amount of glue and thus promotes the formation of a greater density in the more powerful layer (a greater built-in tensile compressive strength) than the thinner layer. After the compression step and complete hardening of the two surface layers, different tensile and compressive strengths (strengths) have been built into the respective surface layer. That is, the more powerful surface layer has a built-in greater tensile and compressive strength than the thinner surface layer.
    After removing the wood chipboard from the press tool, this causes the wood chipboard to assume a convex shape. This is due to the fact that the built-in different tensile and compressive strengths in the respective surface layer act in such a way that the more powerful surface layer with the greater tensile and compressive strength contracts to a greater extent than the thinner surface layer with which the wood chipboard bends after leaving the press tool. The curvature is such that the curvature of the more powerful surface layer in space has a smaller radius than the curvature of the thinner surface layer.
    A further embodiment means that the pressing temperature for the first and the second quantity, respectively, is different. A convex wood chipboard with the same power of the first and second amount can thus be achieved by applying a higher temperature to the amount which it is desired to obtain a greater bias voltage. The larger bias creates a convex wood chipboard when the wood chipboard is removed from the press tool. The amount of the larger bias corresponds to the layer that forms the concave surface of the wood chipboard. Preferably, the step of applying a second amount of glued wood shavings to the filling amount takes place in such a way that the thickness of this second amount becomes less than the thickness of the first amount.
    In this way, the lower surface layer has been made more powerful than the upper surface layer, whereby the upper outer surface of the wood chipboard, after the removal of the wood chipboard from the pressing tool, acquires a convex shape. That is, the wood chipboard bends with an arc upwards after it has left the press tool. This is advantageous because subsequent handling steps such as cutting the wood chipboard into suitable shelves and mounting them between gaviaries of bookshelves (or packing the shelves in packages using robots) can be done without the shelves having to be turned upside down.
    The purpose is that the shelf with its convex upper side is mounted in the bookshelf.
    The shelf can thus always have its convex surface upwards in the entire production line without any extra turning step. Even when an installer is facing the parts of a kit in a package, he will not have to turn over the shelves, which in itself can facilitate installation. This is time-saving and thus cost-effective.
    Suitably, the method comprises the further step of applying fluid, such as pure water, to at least one of said amounts prior to the compression step.
    In this way, the temperature can be raised during the compression step by evaporating the water from a heat supplied to the glued wood chips. With the help of the water vapor that is created, efficient heat can be carried further into the quantities with glued wood shavings. This promotes the curing of the adhesive and accelerates it. Advantageously, only fl uidum, such as pure water, is applied to the outer surface of the more powerful amount of glued wood chips (and no fl uidum to the other thinner amount) where the curing takes place faster in the more powerful amount. As a result, the curing further acquires a favorable condition in this more powerful surface layer. After the compression step and complete curing of the two surface layers, different compressive and tensile strengths (strengths) have been built into the respective surface layer. That is, the more powerful surface layer has, with the aid of the supplied water, a maintained built-in greater compressive and tensile strength than the thinner surface layer. In this way, the ratio between the thick and thin surface layer (for example 40% thin surface layer and 60% thick surface layer, ie the thicker surface layer is 1.5 times thicker than the thinner one) can be equalized while the more powerful surface layer can be maintained with sufficient high compressive and tensile strength. This means, despite the evened-out relationship, that the thicker surface layer contracts to a greater extent than the thinner surface layer, with which the wood chipboard bends after leaving the press tool, although the thinner surface layer may be almost of the same thickness as the more powerful surface layer.
    Preferably, the step of compressing said amounts comprises applying heat to the tool surface abutting the more powerful amount of glued wood shavings.
    In this way, the temperature of the more powerful surface layer can be raised during the compression step. This promotes the curing of the adhesive of this more powerful surface layer and accelerates the curing thereof. Thus, the more powerful surface layer can be built in with even greater tensile strength. The more powerful surface layer thereby contracts to an even greater extent than the thinner surface layer, with which the wood chipboard satisfactorily curves after leaving the press tool.
    Thus, a manufacturer of wood chipboard can control the convexity of the pre-pressed wood chipboard by using various parameters, such as the distribution ratio of thickness of the first and second amount of glued wood chips (upper and lower surface layers), applying water to upper and or lower surface layers in different amounts. temperature difference of the upper and lower tool surface of the press tool. An operator can cost-effectively set distribution means in a production line so that the desired distribution between first and second amount of glued wood chips is achieved and can adjust the supply of water via nozzles on the respective surface layer and can adjust the heat supply to the respective tool surface with setting controls.
    The operator can easily set said parameters for the desired convexity by means of the control unit.
    DESCRIPTION OF THE DRAWINGS In the following, the present invention will be explained in more detail with reference to the accompanying drawings, in which schematically: Fig. 1a shows a manufacturing method according to a first embodiment where a clock press is used to produce a convex chipboard; Fig. 1b shows compression of glued wood shavings in layers of different thickness; Fig. 1c shows an enlargement of a section in Fig. 1b; Fig. 1d shows a completed convex chipboard according to the first embodiment; Fig. 2 shows a production line with a continuous pressing equipment for manufacturing a wood chipboard according to the first embodiment; Fig. Ba shows a bookshelf with a wood chipboard as a shelf according to the first embodiment; Fig. 3b shows a wood chipboard according to the prior art; Fig. 4 shows a manufacturing method according to a second embodiment; and Fig. 5 shows a manufacturing method according to a third embodiment.
    DESCRIPTION OF EMBODIMENTS The present invention will now be described as an exemplary embodiment.
    For the sake of clarity, components without significance for the invention have been omitted from the drawing. The same details shown in several figures may in some cases lack reference numerals, but correspond to those which have reference numerals.
    Fig. 1 shows a manufacturing method according to a first embodiment where a bar press 1 is used to produce a convex wood chipboard 3. The method involves applying a first amount of glued wood chips 7 to a lower tool surface 9. Then a filling amount 11 glued wood chips 7 'is applied on the first amount 5 to form an intermediate layer 12 of wood chips. This intermediate layer 12 consists of coarser wood shavings 7 'than the wood shavings 7 of the first set 5. Then a second set of 13 glued wood shavings 7 is applied to the filling quantity 11 in such a way that the thickness of this second quantity 13 by means of distribution means (not shown) becomes less than the power of the first amount 5. The distribution means comprises a wood chip discharge means (not shown), such as a spreading equipment, which distributes the amount of wood chips 7 from a storage / gluing space of wood chips. Fig. 1b shows how the lower tool surface 9 with applied amounts 5, 11, 13 is raised towards an upper tool surface 15 of the clock press 1. The tool surfaces 9, 15 compress the amounts 5, 11, 13. A compression (shown by arrows P) takes place under heat to achieve a predetermined thickness of the finished wood chipboard. The glued wood shavings 7, 7 'are pressed together against each other and the glue of these hardens, whereby the wood shavings are bonded together.
    In the compression step, the first amount 5 (which is more powerful than the second amount 13) is compressed by means of the lower tool surface 9 and the filling amount 11 (that is, the intermediate layer 12 automatically acts as a tool surface because the second amount 13 is thinner than the first set 5 and the more powerful first set 5 must be compressed a longer distance). The filling quantity 11 thus acts as a counterweight. The applicant has noted that the more powerful first amount 5 is more easily compressed than the thinner second amount 13 due to the larger amount of glue in the first amount 5, which is time-saving and which gives a greater compression of the first amount 5 which in turn 11 generates higher density in the first set 5 compared to the thinner second set 13. When the three sets 5, 11, 13 have hardened, the first set 5 will thus have a built-in greater tensile compressive strength (strength or prestress) the thinner second set 13 due to the fact that the more powerful first set 5 has a greater density than the thinner second set 13. That is, the first set 5 tends to contract with greater force than the second set 13. This ratio is schematically illustrated in Fig. 1c. The tensile and compressive forces are illustrated by arrows 17, 17 ”. The first set 5 thus contracts to a greater extent than the second set 13 with which the wood chipboard 3 bends after leaving the bar press 1 where the more powerful first layer has a concave surface and the second thinner layer has a convex surface.
    Fig. 1d shows how the hardened wood chipboard 3 assumes its determined convexity, after it has been removed from the clock press 1. The dotted line 19 shows a straight line to illustrate the bending of the wood chipboard 3. The built-in larger tensile forces 17 (the stresses) in the more powerful first set 5 relative to the smaller tensile forces 17 '(the stresses) in the thinner second set 13 provide a convexity of the wood chipboard 3 removed from the clock press 1. The convex wood chipboard 3 has a curvature which can is defined by the fact that the curvature of the first quantity 5 in space has a smaller radius than the curvature of the second quantity 13. The convex curvature of the wood chipboard 3 is effected towards the load-bearing side, i.e. the first set 5 is opposite the second set 13 facing the load.
    The finished wood chipboard 3 thus comprises a first 21 and second 23 wood chip layers intermediate storage of the intermediate layer 12 comprising wood chips 7 'of larger chip size than the first 21 and second 23 wood chip layers.
    As a result, a wood chipboard 1 can be produced with a lighter weight at the same time as it exhibits a good resistance to deflection and / or allows a relatively large deflection distance. By the method of providing one of the surface layers (the first wood chip layer 21 comprising the first amount of wood chips 5 or the second wood chip layer 23 comprising the second amount 13 wood chips) with greater thickness than the opposing surface layer, after removing the pre-pressed wood chipboard from the clock press, an over-tensioned wood chipboard 3.
    This phenomenon is set in that the more powerful first wood chip layer 21 during curing automatically due to the greater density of this more powerful surface layer 21 during compression hardens faster than in the thinner wood chip layer 23. The more powerful first wood chip layer 21 comprises, in addition to a larger amount of wood chips , naturally a larger amount of glue than the thinner second wood chip layer 23 which accelerates the curing relative to this second wood chip layer 23.
    After the wood chip layers 21, 23, different compressive and tensile strengths (strengths) have been built into the compression step and complete hardening of the two in the respective wood chip layers 21, 23. That is, the more powerful first wood chip layer 21 has a built-in greater tensile strength than the thinner second wood chip layer 23. This means that after the removal of the wood chipboard 3 from the clock press 1, the wood chipboard 3 assumes a convex shape. This is due to the fact that the built-in different compressive and tensile strengths in the respective wood chip layers 21, 23 operate in such a way that the more powerful first wood chip layer 21 with the greater tensile strength contracts to a greater extent than the thinner second wood chip layer 23 with which the wood chipboard 3 bends. to have left the clock press 1.
    By controlling the ratio between the powers of the first 5 and second 13 sets, respectively, the convexity of the pre-pressed wood chipboard 3 can be determined. If a wood chipboard 3 with large convexity is desired, the distribution means is controlled to distribute glued wood chips 7 in such a way that one of the first 5 or second 13 quantities of wood chips has a substantially greater thickness than the other. If, on the contrary, a concave wood chipboard 3 is desired, a control room (not shown) is controlled from a control room (not shown) to discharge glued wood chips 7 in such a way that the first quantity 5 becomes thinner than the second.
    In this example, the first wood chip layer 21 is approximately four times more powerful than the second wood chip layer 23. By means of a large arc height of the wood chipboard 3 thereby obtained and high compressive and tensile strength of the first wood chip layer 21, a greater load can be exerted on the wood chipboard 3.
    Likewise, the wood chipboard 3 in humid climates can withstand deflection in a satisfactory manner because a humid external environment itself can make the wood chipboard 3 softer and thus less resistant to deflection. The upper surface 24 of the wooden clamping disc is convex and its lower surface 26 is concave.
    Now we turn to Figs. 2, 3a and 3b. The convex wood chipboard 3 is advantageously used for shelves 27, as shown in Fig. 3. The upper surface 24 of the shelf 27, which is arranged to receive articles, such as books 29, is convex. Fig. 2 shows a continuous press 31. This is used to manufacture the wood chipboard 3, which is then cut by means of a cap 33 to determine the dimensions of the shelves 27 in length and width. The continuous press 31 operates approximately according to the same principle as the clock press 1 in Fig. 1. That is, instead of moving the tool surfaces 9, 15 only vertically towards each other, the tool surfaces 9, 15 compress the quantities 5, 11, 13 during that the quantities are transported horizontally at the same time.
    Under the influence of heat, the first 5 and the second 13 the amount of glued wood shavings 7 is compressed with an intermediate (filling amount 11) amount of glued wood shavings in between. The first amount 5 is applied thicker than the second amount 13. The first amount 5 is controlled by means of a first distributing means (a first spreading equipment 35) to be more powerful than the second amount 13. The second amount 13 is applied by means of a controllable second spreading equipment 37 to provide desired power of this second quantity 13. That filling quantity 11 is controlled by means of a third spreading equipment 39 to the desired power. All control of the powers of the different quantities 5, 11, 13 takes place from a control room (not shown). There is also a control of the gluing of the wood chips 7, 7 ', setting of heat of the tool surfaces 9, 15. When the finished wood chip 3 leaves the continuous press 31, it will take a convex shape, i.e. bend upwards. The wood chipboard 3 is cut into finished shelves 27.
    In this example, the first wood chip layer 21 is approximately three times more powerful than the second wood chip layer 23. By this distribution of the amount of wood chips 7 in the first 21 and second 23 wood chip layers, respectively, an optimal arc height B is achieved to resist unloading while the second wood chip layer 23 its higher density can withstand impact and mechanical damage satisfactorily. The arc height B is fi niered as the perpendicular distance from the chord K.
    The wood chipboard 3 is thus cut to suitable widths to form tensioned shelves 27 where the first wood chip layer 21 is turned downwards. A shelf 27 with a length of 700-800 mm is preferably provided with an arc height B above the cord K of approximately 1.5-2 mm. The height of the arch can be adjusted from the control room by adjusting the thickness of the first set 5 to the thickness of the second set 13 by means of the spreading equipment 35, 37. Experiments made by the applicant have shown that a ratio of 75-80% thickness of the first chipboard layer to 20-25 % thickness of the second wood chip layer (where 100% is the total thickness of the first and second wood chip layers together) gives a satisfactory arc height B and adequate resistance to forces striving to deflect the shelf. The intermediate layer 12 with coarser wood chips 7 'is approximately twice as thick as the first wood chip layer 21. An arc height of 1.5-2 mm of such a shelf 27 does not affect the aesthetic impression. When the shelf surface 27 is loaded, a deflection will take place, but due to the greater compressive and tensile strength of the thicker first wood chip layer 21, the shelf surface 27 will be able to withstand this load to a great extent and will not bend significantly. A deflection N (see Fig. 3a) from the chord K of 1.5-2 mm does not give an effect on the aesthetic impression here either. Thus, the shelf can be loaded so much that the total maximum deflection distance (arc height B plus deflection N) can be as much as 3-4 mm without affecting the aesthetic impression.
    Since the wood chipboard 3 is already manufactured in the continuous press 31 with the convex upper surface 24 upwards, the wood chipboard 3 can be cut into shelves 27, which are then inserted into a bookshelf 41 without having to be turned upside down, which is advantageous from a time perspective. That is, in the production of shelves 27, it is effective to allow the first amount 5 first applied to the lower tool surface 9 to be more powerful than the second amount 13 already in the continuous press 31.
    The shelf 27 is coated with a surface layer (not shown), such as a plastic fi im, for, among other things, the aesthetic impression. In this way, through the plastic film (or board veneer) applied to the upper 24 and lower 26 surface of the wood chipboard 3, the wood chipboard 3 can be made further resistant to deflection.
    Thus, the shelf 27 has been achieved, which ensures an aesthetic impression over time even when a large load is exerted on the shelf 27 from above for a long time. The shelf plane 27, which rests on supports 43 attached to both ends of the bookshelf 41, must be as straight as possible when placing books 29 on the shelf plane 27. Otherwise, the aesthetic impression would be affected. The shelf 27 must thus be able to withstand forces which strive to bend the shelf 27. The chips 7 are not oriented in the longitudinal direction in the respective layer of the finished wood chipboard. The chips are arranged in the fl century different directions.
    This builds up strength in all directions.
    Fig. 3a shows the bookshelf 41 comprising shelves 27 ', 27 ". The upper shelf 27 'carries no load and the lower shelf 27 "carries the load of books. An arc height of 1.5-2 mm of the shelf 27' (without load) does not affect the aesthetic impression. When the shelf 27 "is loaded, a deflection N will occur, but due to the greater compressive and tensile strength of the thicker first layer 21, the shelf plane 27" will be able to withstand this load to a great extent and withstand further deflection. A deflection N from the chord of 1.5-2 mm does not affect the aesthetic impression. Thus, the shelf 27 can be loaded so much that the total maximum deflection distance (arc height B plus deflection N) can be as much as 3-4 mm without affecting the aesthetic impression.
    Fig. 3b shows a wood chipboard 3 'according to the prior art. The known shelf plane 3 'comprises an upper and a lower wood chip layer of the same thickness with an intermediate wood chip layer between the upper and lower wood chip layer.
    The shelf plane 3 'is straight when it has no load. When the shelf 3 'is loaded with the same load as in Fig. 3a, a deflection N of 3 «4 mm from the chord will affect the aesthetic impression.
    Fig. 4 shows a manufacturing method according to a second embodiment. The method comprises the further step of applying water 45 by means of nozzles 47 to the lower tool surface 9 before the first amount 5 is sprinkled by means of the first spreading equipment 35. Thus water 45 is applied to the first amount 5 of glued wood chips 7 by spraying on the lower tool surface 9. before the compression step. The amount of water 45 as 20-100 40-80 gr / m2. When compressing the applied amounts 5, 11, 13 between it is applied, gr / m 2, preferably lower 9 and upper tool surface, heat is applied to the glued wood chips 7 by means of lower 49 and upper 51 heating elements. The heat promotes and accelerates the curing of the hour of the timbered wood chips T. On the side where water is applied, i.e. on the first amount 5, by means of the lower heating element 49 an evaporation of the water 45 will take place, which raises the curing temperature faster for the first amount Compared to the second amount 13 (since the evaporated water 45 transports the heat faster). Thus, when the adhesive of the three sets 5, 11, 13 has hardened, the first set 5 will have a built-in greater tensile and compressive strength 17 (tensile strength) than the thinner second set 13 (see also Fig. 1c). ) due to the fact that the adhesive that hardens tends to shrink slightly.
    That is, the first amount 5 tends to contract first during curing and the second set 13 which cures slightly later tends to contract later with weaker tensile forces 17 ”. The built-in pressure and tensile forces 17 in the first hardened set 5 are greater than in the second hardened set 5, as shown in Fig. 1c. The first hardened amount 5 therefore contracts to a greater extent than the second hardened amount 13 when the wood chipboard 3 leaves the continuous press 31, whereby the wood chipboard 3 acquires a convex shape. With the help of the water vapor that is created, efficient heat can be transferred further into the first amount 5 with glued wood shavings 7. This promotes the curing of the adhesive in this amount and accelerates the curing. After the compression step and complete hardening of the quantities 5, 11, 13, different pressures and tensile strengths (compressive and tensile forces 17, 17 'or strengths) have been built into the respective quantity 5, 13. That is, the more powerful first wood chip type 21 has by means of the supplied water 45 maintains a built-in greater compressive and tensile strength than the thinner second wood chip type 12, which is also illustrated in Fig. 1c. In this way, the ratio between the more powerful first wood chip layer 21 and the thinner second wood chip layer 23 (for example 40% thin wood chip layer 23 and 60% thick wood chip layer 21, i.e. the more powerful first wood chip layer 21 is 1.5 times more powerful than the thinner one) can be equalized. second wood chip type 23) at the same time as the more powerful first wood chip type 21 can be maintained with sufficiently large compressive and tensile strength. This means, despite the equalized relationship, that the more powerful first wood chip layer 21 contracts to a greater extent than the thinner second wood chip layer 23, with which the wood chipboard 3 bends after leaving the continuous press 31, although the second wood chip layer 23 may be of approximately the same A control unit 53 controls the amount of water 45 supplied to the first amount of wood chips 7 and also controls the heat of the heating elements 49, 51. Fig. 5 shows a manufacturing method according to a third embodiment where the step with compression of the amounts 5, 11, 13 involves heating the more powerful first amount 5 with a higher temperature than the thinner second amount 13. In this way the temperature at the compression step can be raised of the more powerful first amount 5. This favors the curing of the adhesive of the first set 5 and accelerates the hardening of this first set 5. Thus, the more powerful first wood chip layer 21 can be built in with even greater tensile strength. The more powerful first wood chip layer 21 thus contracts to a greater extent than the thinner second wood chip layer 23, with which the wood chip board 3 satisfactorily curves and assumes a convex shape after leaving the press tool. Parameters can be easily set for the desired convexity. For example, the operator can set the spreading equipment 35, 37, 39 so that the first quantity and the second quantity have the same power and he can set the nozzles 47 so that water 45 is supplied to one or the other quantity 5, 13 and set the heating elements 49. , 51 so that heat is distributed equally to the two amounts 5, 13 or only use the heating elements 49, 51 to distribute heat to the wood chips 7 in such a way that the first amount 5 is heated more than the second amount 13. For example, he can turn off supply of water 47, set the spreading equipment 35, 37 so that the powers of the first 5 and the second 13 amount become equal and set the lower heating element 49 so that higher heat is supplied to the amount (5 or 13) which is desired to have greater built-in tensile forces 17 .
    Thus, a manufacturer of the wood chipboard 3 can, by means of the control unit 53, control the convexity of the pre-pressed wood chipboard 3 by using various parameters, such as the distribution ratio of thickness of the first and second quantity 13 glued wood chips 7 (upper and lower surface layers), the amount of water 45 on the first 5 and / or other 13 amount, temperature differences of lower 9 and upper 15 tool surface. An operator (not shown) can cost-effectively set up the spreading equipment 35, 37, 39 in a production line, so that a desired distribution between the first 5 and the second amount of blasted wood buckles 7 is achieved. He can easily adjust the supply of water 45 via the nozzles 47 on the respective quantity 5, 13 and can with setting controls adjust the heat of the respective tool surface 9, 15.
    Such an embodiment means that the pressing temperature for the first 5 and the second 13 quantities, respectively, is produced differently. A convex wood chipboard with the same thickness of the first 5 and the second 13 quantity can thus be achieved by applying a higher temperature to the quantity 5 which it is desired to obtain a greater prestress. The larger bias creates a convex wood chipboard 3 when the wood chipboard 3 has been removed from the press tool 1, 31. The amount 5 with the larger bias corresponds to the wood chip layer 21 which forms the concave surface of the wood chipboard 3.
    By means of the control unit 53 it is possible to control the bias voltage (and thus the convexity of the wood chipboard) in a repeatable manner.
    The invention is not to be construed as being limited to the embodiments described above, but further developments and / or combinations thereof are possible within the scope of the scope of the appended claims. The finer the wooden buckle used in the amount built in with prestressing tensile forces, the stronger the prestress will be due to the higher density. The invention can be used for the manufacture of bookshelves. However, other panels and panel components for furniture, interior and construction products, chipboard panels, etc. can also be provided by and constitute the invention. The intermediate layer may be thicker than the thicker layer, but may also be thinner. The span size in the first and second layers is preferably narrower than in the intermediate layer, but can also be coarser.
    权利要求:
    Claims (10)
    [1]
    Wood chipboard comprising a first (21) and second (23) wood chip layers intermediate storing an intermediate layer (12) comprising wood chips (7 ') of chip size other than wood chips (7) of the first (21) and second (23) wood chip layers, characterized in that the first wood chip layer (21) is thicker than the second wood chip layer (23), wherein a greater tensile stress of the first wood chip layer (21) than of the second wood chip layer causes the wood chip board (3) to be convex.
    [2]
    The wood chipboard of claim 1, wherein the first wood chip layer (21) is approximately four times more potent than the second wood chip layer (23).
    [3]
    The wood chipboard of claim 1, wherein the first wood chip layer (21) is approximately three times more potent than the second wood chip layer (23).
    [4]
    Wood chipboard according to one of Claims 1 to 3, in which the wood chip board (3) is coated with a surface layer.
    [5]
    Wood chipboard according to one of the preceding claims, wherein the wood chips in the intermediate layer (12) have a coarser chip size than in the first (21) and second (23) wood chip layer.
    [6]
    Shelf made of a chipboard (3) according to any one of claims 1 to 5, wherein the upper surface (24) of the shelf (27) arranged to receive articles, such as books (29), is convex.
    [7]
    A method of manufacturing a wood chipboard (3) comprising a first (21) and second (23) wood chip layers intermediate storing an intermediate layer (12) comprising wood chips of a chip size other than the first (21) and second (23) wood chip layers, the method comprising the steps : Applying a first amount (5) of glued wood chips (7) to a lower tool surface (9) of a press tool (1, 31); - applying a filling quantity (11) of glued wood shavings (7 ') to the first quantity (5); - applying a second amount (13) of glued wood chips (7) to the filling amount (11); compressing said quantities (5, 11, 13) by means of the lower (9) tool surface and an upper tool surface (15); providing differentiated times when the adhesive of the glued wood chips (7) hardens in the first (5) and second (13) amounts, respectively, by providing these amounts with different thickness and / or by heating the respective amounts (5, 13) to different temperatures; and removing the hardened wood chipboard (3) from the press tool (1, 31).
    [8]
    Method according to claim 7, wherein the step of applying a second amount (13) of glued wood chips (7) to the filling amount (11) takes place in such a way that the thickness of this second amount (13) becomes less than the thickness of the first amount (13). 5).
    [9]
    The method of claim 7 or 8, wherein the method comprises the further step of applying fluid, such as pure water (45), to at least one of said amounts (5, 13) prior to the compression step.
    [10]
    A method according to any one of claims 7 to 9, wherein the step of compressing said amounts (5, 13) comprises applying heat to the tool surface (9) abutting the more powerful amount (5) with glued wood chips (7).
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    同族专利:
    公开号 | 公开日
    WO2010085198A1|2010-07-29|
    SE534068C2|2011-04-19|
    EP2389290A4|2012-08-01|
    EP2389290A1|2011-11-30|
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    法律状态:
    2015-09-01| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE0950018A|SE534068C2|2009-01-20|2009-01-20|Convex wood chipboard|SE0950018A| SE534068C2|2009-01-20|2009-01-20|Convex wood chipboard|
    EP10733692A| EP2389290A4|2009-01-20|2010-01-14|Convex woodchip board|
    PCT/SE2010/050034| WO2010085198A1|2009-01-20|2010-01-14|Convex woodchip board|
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