JP5642974B2 - Wood laminated board - Google Patents

Description

  The present invention relates to a wood laminated board in which a plurality of single plates are bonded in the width direction.

  Conventionally, as a wood laminated board formed by bonding a plurality of single plates into a plate shape, one obtained by bonding a plurality of single plates formed with a predetermined width and straight at both ends is known in the width direction ( Patent Document 1). In addition, there is also known one in which both side ends of a single plate are formed in a sawtooth shape to increase the bonding area to increase the bonding strength between the single plates (Patent Document 2). However, in Patent Document 1 and Patent Document 2, since the fibers extending in the direction of the mouth of each single plate extend straight and continuously, the wood laminated plate dries or absorbs moisture due to changes in temperature, humidity, and the like. Otherwise, there is a problem that warping or twisting is likely to occur. Therefore, by applying paint to the surface of the timber laminated board to form a coating film and blocking moisture from entering and leaving the timber laminated board, it is possible to prevent warping of the timber laminated board. What was done is also known.

  On the other hand, by alternately forming uneven portions on both side ends of a single plate, a single plate is formed so as to meander in a direction perpendicular to the fiber direction (direction of the end), and the uneven portions are fitted and bonded together. It has been proposed (Patent Document 3). In this patent document 3, since the fiber extending in the direction of the kerf is cut by the concavo-convex part and becomes discontinuous, it is possible to make it difficult to warp even if the temperature and humidity change.

  However, the inventor of the present application will be described in detail later, but even in the case of Patent Document 3, merely by forming the uneven portions of the single plate alternately, changes in temperature, humidity, and the like can cause changes in Patent Document 1 and Patent Document 2. It has been found that there is a problem that large warping and twisting occur as in the case of things. In addition, when painting on the surface of a timber laminated board, the actual production of the timber laminated board is such that after bonding a plurality of single plates, the surface is shaved and flattened or the plate thickness is made uniform. There was a problem that the yield rate was lowered because the wood laminated board was warped due to the entry and exit of moisture, etc., between the time when the paint was cut and the time when the paint was applied.

  Then, this invention makes it a subject to provide the wood laminated board which does not warp reliably with respect to changes, such as temperature and humidity, in view of said situation.

In order to solve the above-mentioned problems, the wood laminated board of the present invention is formed as follows: “It is formed in a concavo-convex shape with a predetermined width and a predetermined amplitude and a predetermined pitch with the predetermined width in the direction perpendicular to the direction of the wood's mouth and the direction of the mouth. A wood laminated board obtained by bonding a plurality of single plates in the predetermined width direction, wherein the predetermined amplitude is W when the predetermined width of the single plate is W, the predetermined amplitude is S, and the predetermined pitch is P. S is 0.5 W ≦ S ≦ 2.5 W, and the predetermined pitch P Ri 5W ≦ P ≦ 10 W der, of the veneer to cut wood fiber extending to the end grain direction bumpy Both ends are formed into smooth wavy curves ".

Here, the "butt end direction" refers to a direction in which the fibers of the wood extending (vertically standing trees state), the cut surface cut in a direction perpendicular to the butt end direction Ru appear annulus timber .

  By the way, in Patent Document 3, there is no description or disclosure about the size and interval (amplitude and pitch) of the concavo-convex portions of each single plate constituting the wood laminated board, and the concavo-convex portions are simply formed alternately. It was difficult to obtain a timber laminated board with little warp. Therefore, the inventor of the present application has determined that the size and spacing of the uneven portions of each single plate in the wood laminated board, that is, the wood piles having different amplitudes and pitches in order to obtain optimum ranges of amplitude (S) and pitch (P). A plurality of plates were prepared and subjected to a fracture load test and a warp test. The test contents and test results will be described below with reference to FIGS.

  Fig.1 (a) is a perspective view which shows the wood laminated board which is one Embodiment of this invention, (b) is a top view which expands and shows a part of wood laminated board. FIG. 2 is a table showing an aspect of each test specimen, and FIG. 3 is a table showing a destructive load test result of each test specimen. FIG. 4A is a plan view schematically showing the measurement points of the specimen in the warp test, and FIG. 4B is a table showing the relationship between the test results and the measurement points in the subsequent tables of FIGS. is there. FIG. 3 is a table showing the warpage test results in Nos. 1 to 3, and FIG. 4 is a table showing the warpage test results in Nos. 4 to 6, and FIG. 7 is a table showing the warpage test results in 7 to 9, and FIG. 10 is a table showing warpage test results in 10 and 11. Further, FIG. 9 is a graph showing the results of a fracture load test and a warpage test.

  As shown in FIG. 1, the timber laminated board prepared as a test body is formed with a predetermined width W in a direction perpendicular to the direction of the wood's mouth, and both ends thereof have a predetermined amplitude S and a predetermined with the direction of the mouth as an axis. A plurality of single plates 2 formed in a concavo-convex shape (wave shape) at a pitch P are bonded in the width direction, and the amplitude S and the pitch P in each specimen are as shown in FIG. Specifically, the test specimen No. In Nos. 1 to 4, the pitch P is set to 160 mm, and the amplitude S is sequentially increased to 15 mm, 30 mm, 45 mm, and 60 mm. In addition, the specimen No. In Nos. 5 to 7, the pitch P is set to 220 mm, and the amplitude S is sequentially increased to 30 mm, 60 mm, and 90 mm. In addition, the specimen No. Nos. 8 to 10 are obtained by increasing the pitch P to 280 mm and increasing the amplitude S to 30 mm, 60 mm, and 90 mm. Furthermore, the specimen No. No. 11 has both the pitch P and the amplitude S. That is, the specimen No. Nos. 1 to 10 are obtained by forming the side edges of each single plate 2 in an uneven shape. 11 is formed by linearly forming the side edges of each single plate.

  In addition, the width | variety (plate width) W of the single board 2 in each test body is 30 mm, respectively, and the board thickness of a wood laminated board is 10 mm. In the table of FIG. 2, the relative values of the pitch P and the amplitude S based on the plate width W are also shown for each test body. In addition, for each test specimen, three specimens of the same mode are prepared for each of the destructive load test and the warp test, and the test results are averaged. It has become. Furthermore, each test body is obtained by alternately bonding the veneers 2 formed using firewood and cedar.

  First, the destructive load test was performed using a known universal testing machine, and the test was performed at a load speed of 5 mm / min and a load span of 380 mm. Specimen No. For 6, the number of individuals was two and the test was conducted. And as shown in FIG.3 and FIG.9, when the side edge of the single plate 2 is made uneven as a result of the destructive load test, the destructive load is reduced as compared with the linear one (test body No. 11). It turns out that the breaking load tends to decrease as the amplitude S of the concave-convex shape increases. This seems to be due to the fact that the smaller the amplitude S is, the longer the fiber length of the wood extending in the direction of the lip in the veneer 2 is. On the other hand, with respect to the pitch P, although there is some variation between the same pitches P, it is considered that the pitch P has little influence on the breaking load as compared with the amplitude S.

  Next, in the warpage test, the specimen was allowed to stand for 24 hours in an atmosphere at a temperature of 40 ° C. and a humidity of 30% RH, and then further left for 24 hours in an atmosphere of a temperature of 40 ° C. and a humidity of 90% RH. The distance from the apparatus reference plane at each measurement point before and after the test was measured using a known laser distortion measuring apparatus. As shown in FIG. 4 (a), the measurement points on the test specimen are X in the width direction (amplitude S direction) of the wood laminated board and Y in the butt end direction (direction of the pitch P), and A to I. Two coordinate positions (measurement points) were used. And in the table | surface of the curvature test result shown in FIG. 5 thru | or FIG. 8, the measured value of each measurement point AI before and after a test and the displacement difference in each measurement point AI (from the value after a test before a test) Minus the value of).

  In addition, since the coordinate position of the measurement point is different for each specimen due to the size of each specimen, in the tables of FIGS. 5 to 8, in addition to the actual measurement result, the same coordinate position ( In addition to the displacement difference correction in which the values of the measurement points A to I are corrected so as to obtain the measurement result of the test body No. 11 as a reference), the displacement differences of the corrected measurement points A to I are also described. The average of the absolute values (average displacement) and the average of the three individuals (overall average) are also shown. The displacement difference is corrected using the measurement point E as a reference point, and the measurement points B, D, F, and H are linearly proportional to the difference in the coordinate position in the X direction or the Y direction with respect to the X direction or the Y direction. It is calculated using a function. For measurement points A, C, G, and I, the corrected measurement points B, D, F, and H are used as references, and proportional to the difference in coordinate position between the X and Y directions with respect to the X and Y directions. After calculating each using the linear function, the average value thereof (the average value of the value calculated from the X direction and the value calculated from the Y direction for the same point) is used.

  And each specimen No. As a result of performing the above-described warpage test on 1 to 11, as shown in FIGS. 5 and Specimen No. In No. 8, the average displacement (overall average) was 0.5 mm, and almost no warping was visually observed. 9. Specimen No. 10, Specimen No. 6. Specimen No. 4. Specimen No. In the order of 3, the overall average is a small value (less than half of the overall average of specimen No. 11). The remaining specimens No. 1. Specimen No. 2. Specimen No. No. 7 has an overall average of specimen No. 7. The value is smaller than the overall average of 11. In addition, the specimen No. 11, it can be seen from the numerical values of the measurement points A to I before the warp test that a large warp has already occurred in the stage before the test.

  Further, looking at the relationship between the amplitude S and the pitch P, when the pitch P is 160 mm, the overall average (warp) tends to decrease as the amplitude S increases. 11 is about 38% to 80%. On the other hand, when the pitch P is 220 mm, the overall average tends to increase as the amplitude S increases. 11 is about 8% to 66%. In addition, when the pitch P is 280 mm, the overall average tends to increase as the amplitude S increases. 11 is about 10% to 23%.

  From these test results, the amplitude S of each veneer 2 constituting the wood laminated board 1 is less than a predetermined range, and the fiber of the tree extending in the direction of the mouth becomes longer, so that the contraction of the fiber due to the entry and exit of moisture occurs. It seems that the warp is likely to be increased and the warp is increased. If the length is larger than the predetermined range, the length of the fiber of the wood extending in the direction of the end becomes too short, so that the connection in the width direction is weakened and the warp is likely to be warped. On the other hand, if the pitch P of each single plate 2 is smaller than the predetermined range, the length of the fiber of the wood extending in the direction of the mouth becomes too short, so that the connection in the width direction is weakened, and it seems that warp tends to occur. If it is larger than the predetermined range, the fiber of the tree extending in the direction of the mouth becomes long, so that it is likely to be affected by the contraction of the fiber due to the entry and exit of moisture, and the warp is likely to be warped.

  From this, for example, when the pitch P is 160 mm, the specimen No. If the amplitude S is further increased from 4 (amplitude S is 60 mm), it can be estimated that the overall average (warp) increases. In addition, when the pitch P is 220 mm and 2280 mm, it can be estimated that the overall average (warp) increases when the amplitude S is smaller than 30 mm. Furthermore, with respect to the pitch P, if it is larger than 280 mm, it becomes closer to a straight line (test body No. 11), so that the overall average (warpage) is also considered to be large. Thereby, when the plate width W of each single plate 2 constituting the wood laminated plate 1 is 30 mm, the optimum range of the amplitude S and the pitch P is within the range including the amplitude S of 30 mm to 60 mm, and the pitch P Is within the range including 160 mm to 280 mm, the wood laminated board 1 which is less likely to warp with a warpage of about 50% or less as compared with a straight end (test body No. 11) can be obtained. .

  In the above test, only the single plate 2 having a plate width W of 30 mm was tested. However, by making the amplitude S and the pitch P relative to the plate width W relative to each other (see the table in FIG. 2), It is considered that the test results with the same tendency can be obtained even with the plate width of.

  Therefore, in the present invention, based on the above reasons, when the width (plate width) of each of the plurality of single plates 2 constituting the wood laminated plate 1 is W, the amplitude is S, and the pitch is P, the amplitude S is The range is 0.5 W ≦ S ≦ 2.5 W, and the pitch P is in the range 5 W ≦ P ≦ 10 W.

  Thus, according to the wood laminated board 1 of the present invention, when both side ends of a plurality of single boards bonded in the width direction are W, the width of each single board 2 is S, the amplitude is S, and the pitch is P, Since the amplitude S is in the range of 0.5W ≦ S ≦ 2.5W and the pitch P is in the range of 5W ≦ P ≦ 10W, it is formed against changes in temperature, humidity, etc. It is possible to provide a wood laminated board that is surely difficult to warp. In addition, as described above, the wood laminated board is difficult to warp, and even if each single board is bonded to each other and the surface is shaved and finished to a predetermined thickness, the wood laminated board hardly warps, so that the yield can be increased. It is possible to suppress an increase in cost. Moreover, since it can be set as the wood laminated board which is hard to warp, it can be used without a problem even in an unpainted state, and it can be set as the wooden product which can enjoy the bark as it is.

  In addition, since the wood laminated board is configured by bonding multiple single plates with uneven ends on both sides, the surface will have an uneven pattern, which is different from the conventional wood laminated board. Can be made of high-quality wood laminated board. Moreover, even if sapwood or thinned wood that is relatively inexpensive and easily warped is used as a single plate, it can be made to be a wood assembled plate that does not warp easily, so that a cheap and high-quality (hard to warp) wood assembled plate is provided. be able to.

  Furthermore, a plurality of single plates having an amplitude S and a pitch P within the above ranges are cut out from a plate material (for example, a plate material having a plate shape) that is easily warped, and the single plates are bonded together to form a wood laminated plate. Thus, it is possible to make it more difficult to warp than the first plate material, and it is possible to improve the quality of the plate material.

  As for the relationship between the amplitude S and the pitch P in the single plate having the plate width W, the amplitude S is further within the range of 0.8 W ≦ S ≦ 1.5 W and the pitch P is within the above range. May be within the range of 6W ≦ P ≦ 10W, whereby, similarly to the above, it is possible to obtain a wood laminated board that is difficult to warp and a wood laminated board with a high breaking load. Specifically, it can be a wood laminated board having the performance that the warpage is about 30% or less and the breaking load is about 60% or more as compared with the case where both ends are linear.

  By the way, when the uneven shape on both side ends of the single plate is made into a shape having a pin angle as in the case of Patent Document 3, stress tends to concentrate at the corner portion, so that the breaking load of the wood laminated plate is further reduced. There is a risk that the sufficient strength as a plate cannot be maintained. In addition, if an uneven shape having pin angles at both ends is formed, there is a problem that it is difficult to process with an NC router or the like and the cost increases.

  According to the present invention, since both side edges of each single plate have a smooth wavy curve, it is possible to prevent stress from concentrating at a specific position without corners, and to reduce the breaking load of the wood laminated plate. Can be suppressed. In addition, the both sides of the single plate are wavy curves and can be easily processed by a processing machine such as an NC router, so both ends of the single plate can be easily formed, It can suppress that the cost which concerns on increases.

  In addition, since both sides of each single plate have a smooth wavy curve, the curve will appear on the surface of the wood laminated board, which is softer than those with straight lines or uneven shapes with pin angles. It is possible to make a wood laminated board with higher design that can give an impression and feel the warmth of wood.

  In addition to the above configuration, the wood laminated board of the present invention may be characterized in that “the single plates of different materials are alternately bonded”. Here, “different materials” means “different types of wood trees”, “different usage positions (core material and sapwood) in one piece of wood”, and “grains of wood” Different things "etc. can be illustrated.

  According to the present invention, the veneers of different materials are alternately bonded. Therefore, as the difference in materials, for example, when wood and cedar, wood and board, or core and sapwood, wood It is possible to obtain a wood laminated board having a different color, bark or the like, and to have a superior designability (designability) as compared with a conventional wood laminated board. In addition, since single plates of different materials are alternately bonded, it is possible to alternately bond those that are difficult to warp and those that are easily warped, or alternately bond those that are strong and weak. Even those with low characteristics can be made high, and added value can be given.

  As described above, according to the present invention, it is possible to provide a wood laminated board that is not easily warped with respect to changes in temperature, humidity, and the like.

(A) is a perspective view which shows the wood laminated board which is one Embodiment of this invention, (b) is a top view which expands and shows a part of wood laminated board. It is a table | surface which shows the aspect of each test body. It is a table | surface which shows the destructive load test result of each test body. (A) is a top view which shows roughly the measurement point of the test body in a curvature test, (b) is a table | surface which shows the relationship between the test result and measurement point in the table | surface of subsequent FIG. 5 thru | or FIG. Specimen No. It is a table | surface which shows the curvature test result in 1-3. Specimen No. It is a table | surface which shows the curvature test result in 4-6. Specimen No. It is a table | surface which shows the curvature test result in 7-9. Specimen No. 10 is a table showing warpage test results in 10 and 11. It is a graph which shows a destructive load test and a curvature test result.

  The wood laminated board which is one Embodiment of this invention is demonstrated with reference to FIG. As shown in the figure, the wood laminated board 1 of the present embodiment is formed in a concave and convex shape with a predetermined width and a predetermined amplitude in the direction perpendicular to the direction of the wood's mouth, with a predetermined amplitude and a predetermined pitch about the direction of the mouth. A plurality of single plates 2 are bonded in the width direction. In the wood laminated board 1 of this example, both side ends formed in the concavo-convex shape of each single board 2 are formed into smooth wavy curves, the predetermined width of each single board 2 is W, the predetermined amplitude is S, When the predetermined pitch is P, the amplitude S is in the range of 0.5W ≦ S ≦ 2.5W, and the pitch P is in the range of 5W ≦ P ≦ 10W.

  Moreover, the wood laminated board 1 of this example has a single board 2 made of cocoons and cedars of different materials, and the single board 2 made of cocoons and the single board 2 made of cedar are alternately placed. They are bonded to form a single plate. In addition, the well-known adhesive suitable for the adhesion | attachment of wood is used for the adhesive agent used for adhesion | attachment of the single plates 2. FIG. Incidentally, in the wood laminated board of this embodiment, the board thickness is about 10 mm, the width W of each single board 2 is about 30 mm, the amplitude S is about 30 mm, and the pitch P is about 220 mm.

  In the wood laminated board 1 of this example, first, an amplitude S is set to 0. 0 with respect to the width W using a processing machine such as an NC router, from a board of cedar and cedar slightly thicker than the thickness of the wood laminated board 1 as a product. A plurality of single-plates 2 having unevenness on both side ends satisfying the condition of the pitch P in the range of 5W ≦ P ≦ 10W within the range of 5W ≦ S ≦ 2.5W are formed. Next, after applying a predetermined adhesive to the side ends of each veneer 2, the veneer veneers 2 and the cedar veneers 2 are alternately arranged in the width direction to bond the side ends. When the adhesive is solidified, the wood laminated board 1 is completed by scraping both sides and finishing the board to a predetermined thickness. At the time of bonding, it is desirable to apply a compressive load in the width direction, thereby increasing the bonding strength. Further, a paint such as varnish may be applied to the surface of the wood laminated board 1.

  As described above, according to the wood laminated board 1 of the present embodiment, when both side ends of a plurality of single boards bonded in the width direction are W, the width of each single board 2 is S, the amplitude is S, and the pitch is P. Since the amplitude S is in the range of 0.5 W ≦ S ≦ 2.5 W and the pitch P is in the range of 5 W ≦ P ≦ 10 W, it is formed with respect to changes in temperature, humidity, etc. Thus, it is possible to provide the wood laminated board 1 that is surely difficult to warp.

  Moreover, according to the wood laminated board 1 of this example, as mentioned above, even if each single board 2 is bonded to each other and the surface is shaved and finished to a predetermined thickness, the wood laminated board 1 hardly warps, so the yield is increased. The cost can be increased, and the increase in cost can be suppressed. Moreover, since it can be set as the wood laminated board which is hard to warp, it can be used without a problem even in an unpainted state, and it can be set as the wooden product which can enjoy the bark as it is.

  Furthermore, according to the wood laminated board 1 of this example, since both side surfaces of each single board 2 are made into a smooth wavy curve, it is possible to prevent stress from being concentrated at a specific position without corners, and the wood laminated board. It can suppress that the breaking load of 1 falls. In addition, since both side ends of the veneer 2 are wavy curves and can be easily machined by a processing machine such as an NC router, the both side ends of the veneer 2 can be easily formed. It can suppress that the cost which concerns on the laminated board 1 increases.

  Moreover, according to the wood laminated board 1 of this example, since the both ends of each single board are made into the smooth wave-like curve, the curve will appear on the surface of a wood laminated board, and the unevenness | corrugation which has a linear form or a pin angle | corner Compared to the shape, it can give a soft impression, and the veneer veneer 2 and the cedar veneer 2 are glued alternately, so the color of the bark will be different. A wavy curve can be emphasized, and the wood laminated board 1 can be made to have a more excellent design (design) so that the warmth of the wood can be felt compared to a conventional wood laminated board.

  The present invention has been described with reference to preferred embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention as described below. And design changes are possible.

  That is, in the above embodiment, the wood laminated board 1 is shown by alternately bonding the veneer 2 and the cedar 2 formed with different types of trees, but the present invention is not limited thereto. A single plate 2 made of only a single tree, a single plate 2 made of a core material and a single plate 2 made of a side material alternately bonded, a single plate 2 and a single plate of a grid It is good also as what adhered 2 alternately, etc., and there can exist an effect similar to the above.

  Moreover, in said embodiment, the amplitude S is 0.5 W <= S <= 2 with respect to the width W of each single plate 2 about the both-ends formed in the uneven | corrugated shape of each single plate 2 which comprises the wood laminated board 1. In the range of .5 W, the pitch P satisfies the range of 5 W.ltoreq.P.ltoreq.10 W. On the other hand, the amplitude S is further set in the range of 0.8 W.ltoreq.S.ltoreq.1.5 W. In addition, the pitch P may be in the range of 6W ≦ P ≦ 10W, so that in addition to the above-described effects, the wood assembly plate 1 can be reliably prevented from warping, and the wood assembly plate has a high breaking load. 1 can be used.

1 Wood laminated board 2 Single board

JP 2005-131966 A JP-A-5-309614 Japanese Patent Laid-Open No. 7-80802

Claims (2)

A wood laminated board obtained by bonding a plurality of single plates formed in a concavo-convex shape with a predetermined width and a predetermined pitch with a predetermined width in a direction perpendicular to the wood mouth direction and a predetermined amplitude and a predetermined pitch with the mouth end direction as an axis. There,
When the predetermined width of the single plate is W, the predetermined amplitude is S, and the predetermined pitch is P, the predetermined amplitude S is 0.5 W ≦ S ≦ 2.5 W, and the predetermined pitch P is Ri 5W ≦ P ≦ 10 W der, timber assembly plate, characterized in that the two side uneven veneer is formed in a smooth wavy curve to cut wood fiber extending to the butt end direction . 2. The wood laminated board according to claim 1, wherein the single plates made of different materials are alternately bonded .

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