JP7510140B2 - Laminate - Google Patents

Description

The present invention relates to a stack comprising a first plate-like member having a corrugated shape, a second plate-like member arranged above or below the first plate-like member in the stacking direction, and a first member arranged in a first space between the first and second plate-like members.

Patent Publication No. 2829144 (Patent Document 1) describes a plywood that is a laminate of multiple corrugated veneers that have a wave-like shape in a virtual projection plane when viewed from one side in a direction that intersects both the grain direction and the thickness direction of the veneer. The corrugated veneer has concave and convex portions that alternate continuously in the grain direction.

The laminate has multiple corrugated veneers stacked and positioned in a plane-symmetrical relationship with respect to their respective contact surfaces, resulting in voids inside due to the recesses. This allows the laminate to be lighter than a laminate of the same thickness (product thickness) that does not have voids inside.

Patent No. 2829144

However, although the laminate described in the above publication can be made lighter than a laminate of the same thickness (product thickness) that does not have internal voids, the mechanical strength, particularly the compressive strength when the laminate is compressed in the thickness direction, is reduced compared to a laminate of the same thickness (product thickness) that does not have internal voids, and there is still room for improvement in terms of improving the mechanical strength.

The present invention was made in consideration of the above, and one of its objectives is to provide a technology that contributes to achieving both weight reduction and improved mechanical strength.

The laminate of the present invention employs the following measures to achieve the above-mentioned objectives.

According to a preferred embodiment of the laminate of the present invention, the laminate includes at least one first plate-like member, a second plate-like member, and a first member. The first plate-like member has a first surface extending in a first direction and a second direction perpendicular to the first direction, and a second surface extending in the first and second directions and facing the opposite side to the first surface. The first plate-like member has a shape on a virtual projection plane when viewed from one side in the first direction, in which recesses appear alternately and continuously on the first surface and the second surface in the second direction. The second plate-like member is disposed on the first surface side or the second surface side of the first plate-like member. The first member is disposed in at least one of a plurality of first spaces surrounded by a plurality of recesses arranged in the second direction and the second plate-like member. The first member has a total weight smaller than the weight of the first plate -like member having a volume equal to the total volume of the first spaces, and has a length shorter than the length of the first spaces in the first direction . Here, the "first surface" and the "second surface" in the present invention typically correspond to the front and back surfaces of the first plate-like member.

According to the laminate of the present invention, since the first member is disposed in at least one of the first spaces present inside the laminate, a part of the force in the compressive direction acting on the laminate when the laminate is compressed in the thickness direction can be borne by the first member. As a result, the mechanical strength, specifically, the compressive strength, bending strength, and bending modulus of the laminate can be improved compared to a laminate in which the first member is not disposed in the first space. In addition, since the total weight of the first members is smaller than the weight of the first plate-like member having a volume equal to the total volume of the first spaces, the laminate can be made lighter than a laminate of the same thickness that does not have a first space inside. In addition, since the first member has a length shorter than the length of the first space in the first direction, even if the first member is disposed in all of the multiple first spaces, there is a gap in the first space. As a result, the laminate can be made even lighter than a laminate that does not have a first space inside. Note that if there is a gap in the first space, a configuration in which multiple first members are disposed in the first space may be used. Furthermore, if the first member is disposed so as to protrude from the first space in the first direction, the first plate-like member can be extended in the first direction using the portion of the first member protruding from the first space in the first direction. This eliminates the need to connect the first plate-like members together using tape or the like when extending the first plate-like members in the first direction. As a result, it is possible to prevent problems such as the tape or the like peeling off and the first plate-like members being disconnected in a later process.

According to a preferred embodiment of the laminate of the present invention, the laminate includes at least one first plate-like member, a second plate-like member, and a first member. The first plate-like member has a first surface extending in a first direction and a second direction perpendicular to the first direction, and a second surface extending in the first and second directions and facing the opposite side to the first surface. The first plate-like member has a shape on a virtual projection plane when viewed from one side in the first direction, in which recesses appear alternately and continuously on the first surface and the second surface in the second direction. The second plate-like member is disposed on the first surface side or the second surface side of the first plate-like member. The first member is disposed in at least one of a plurality of first spaces surrounded by a plurality of recesses arranged in the second direction and the second plate-like member. The first plate-like member and/or the second plate-like member is wood having a fiber direction along the second direction. The first member is a piece of wood having a total weight less than the weight of the first plate-like member having a volume equal to the total volume of the first spaces, and having a fiber direction along the first direction. Here, the "first surface" and "second surface" in the present invention typically refer to the front and back surfaces of the first plate-like member. In addition, "along the second direction" and "along the first direction" in the present invention literally refer to a case in which the fiber direction is the same as the second direction and the first direction, but preferably also include a case in which the fiber direction is generally along the second direction and the first direction.

According to the laminate of the present invention, since the first member is disposed in at least one of the first spaces present inside the laminate, a part of the force in the compressive direction acting on the laminate when the laminate is compressed in the thickness direction can be borne by the first member. This makes it possible to improve the mechanical strength, specifically, the compressive strength, bending strength, and bending modulus of the laminate, compared to a laminate in which the first member is not disposed in the first space. In addition, since the total weight of the first members is smaller than the weight of the first plate-like member having a volume equal to the total volume of the first spaces, it is possible to reduce the weight compared to a laminate of the same thickness that does not have a first space inside . In addition, by utilizing the anisotropy of the strength of wood, in which the tensile strength in the same direction as the fiber direction is stronger than the tensile strength in the direction intersecting the fiber direction, it is possible to suppress the first plate-like member and the second plate-like member from cracking in the direction intersecting the fiber direction (second direction) (first direction). In other words, since the fiber direction of the first plate-like member and the second plate-like member intersects with the fiber direction of the first member that abuts against the first plate-like member and the second plate-like member with friction (static friction), the relatively strong tensile strength in the fiber direction of the first member can effectively prevent the first plate-like member and the second plate-like member from cracking along the fiber direction.

According to a further embodiment of the laminate of the present invention, the laminate comprises a plurality of first and second plate-like members. A plurality of first spaces are arranged in a second direction and a third direction perpendicular to both the first and second directions. The first members are arranged in series with the first spaces adjacent to each other in the third direction on a virtual projection plane when viewed from one side of the first direction.

According to this embodiment, a portion of the compressive force acting on the laminate can be effectively borne by the first member. This can further improve the mechanical strength of the laminate.

According to a further embodiment of the laminate of the present invention, the first member is disposed in the first space at least at both ends in the second direction.

If the first space exists at both ends of the laminate in the second direction, both ends of the first and second plate-like members in the second direction are exposed as free ends, which makes them more susceptible to cracking and deformation. For example, when cutting the ends of the laminate in the second direction to determine the dimensions of the product, if both ends of the first and second plate-like members in the second direction are exposed as free ends, cracking and deformation will occur in those parts, making it impossible to determine the dimensions accurately and also resulting in a decrease in design. According to this embodiment, the first members are disposed in the first spaces at both ends of the laminate in the second direction, which improves the mechanical strength of both ends of the laminate in the second direction and prevents the above-mentioned inconvenience from occurring.

According to a further embodiment of the laminate of the present invention, the laminate comprises a plurality of first and second plate-like members. A plurality of the first spaces are arranged in the second direction and in the third direction perpendicular to both the first and second directions. The first members are arranged continuously in the first spaces arranged adjacent to each other in a direction intersecting both the second and third directions among the projections of the first spaces on the virtual projection plane when viewed from one side of the first direction, and arranged in a positional relationship in which the virtual connecting lines connecting the centroids of the projections of the first spaces are in a straight line. Here, the "straight line" in the present invention literally refers to a state in which the virtual connecting lines are in a straight line, but preferably also includes a state in which the virtual connecting lines are in a roughly straight line.

According to this embodiment, a portion of the compressive force acting on the laminate can be effectively borne by the first member. This can further improve the mechanical strength of the laminate.

According to a further embodiment of the laminate of the present invention, the first member has a thickness that is the same as the dimension of the first space in the third direction. Here, "the same thickness" in the present invention literally refers to an embodiment in which the thickness dimension of the first member and the dimension of the first space in the third direction are the same, but preferably also includes an embodiment in which the thickness dimension of the first member and the dimension of the first space in the third direction are approximately the same.

According to this embodiment, the compressive force acting on the laminate can be borne more effectively by the first member. This can further improve the mechanical strength of the laminate.

According to a further embodiment of the laminate of the present invention, the second plate-like member has the same wave shape as the first plate-like member. The second plate-like member is arranged on the first surface side or the second surface side of the first plate-like member so as to be plane-symmetrical with respect to the abutment surface with the first plate-like member. The first space is a space surrounded by the recess of the first plate-like member and the recess of the second plate-like member. The first member has a total weight that is smaller than the sum of the weight of the first plate-like member having a volume equal to the sum of the volumes of the recesses of the first plate-like member and the weight of the second plate-like member having a volume equal to the sum of the volumes of the recesses of the second plate-like member. Here, "the same wave shape" in the present invention refers to a shape in which the second plate-like member has a first surface and a second surface facing the opposite side to the first surface, and the shape on the virtual projection plane when viewed from one side in the first direction is a shape in which recesses appear alternately and continuously on the first surface and the second surface in the second direction. In addition to a state in which the second plate-like member literally has the same wave shape as the first plate-like member, it preferably also includes a state in which the second plate-like member has roughly the same wave shape as the first plate-like member.

According to this embodiment, the thickness of the laminate can be increased compared to when the second plate-like member has a flat plate shape. Moreover, since the total weight of the first members is smaller than the total weight of the first plate-like members having a volume equal to the total volume of the first recesses of the first plate-like members and the weight of the second plate-like members having a volume equal to the total volume of the first recesses of the second plate-like members, the laminate can be made lighter than a laminate of the same thickness that does not have a first space inside.

According to a further embodiment of the laminate according to the present invention in which the second plate-like member has a wavy shape, the projection of the first member on the virtual projection plane when viewed from one side in the first direction and the projection of the first space on the virtual projection plane have the same shape. Here, the "same shape" in the present invention refers to an embodiment in which the area is also the same, and preferably includes an embodiment in which the projection of the first member on the virtual projection plane and the projection of the first space on the virtual projection plane have approximately the same shape, in addition to an embodiment in which the projection of the first member on the virtual projection plane and the projection of the first space on the virtual projection plane have the same shape.

According to this embodiment, the first member can prevent relative movement (relative positional deviation) between the first plate-like member and the second plate-like member in a stacked state in the second direction.

According to a further embodiment of the laminate of the present invention, it further comprises at least one first flat plate arranged on the first surface side of the first or second plate-like member arranged on one end side in the third direction and/or at least one second flat plate arranged on the second surface side of the first or second plate-like member arranged on the other end side in the third direction.

According to this embodiment, the unevenness of the first and second plate-like members does not appear on the front and back surfaces of the laminated product, which improves the design and workability of the laminated product.

According to a further embodiment of the laminate of the present invention, the laminate further comprises a second member disposed in at least one of the second spaces surrounded by the first recess and the first and/or second flat plate. The second member has a total weight equal to or less than the weight of the first and/or second plate-like members having a volume equal to the total volume of the second spaces.

According to this embodiment, it is possible to improve the compressive strength between the first plate-like member or the second plate-like member and the first or second flat plate. Moreover, since the total weight of the second members is equal to or less than the weight of the first or second plate-like member having a volume equal to the total volume of the second spaces, it is possible to reduce the weight compared to a laminate of the same thickness that does not have a second space inside.

According to a further embodiment of the laminate of the present invention, the second member is disposed in the second space at least at both ends in the second direction.

If the second space exists at both ends of the laminate in the second direction, the first plate-like member, the second plate-like member, and the first and second flat plates are exposed in a free state, which makes them more susceptible to cracking and deformation. For example, when cutting both ends of the laminate in the second direction to determine the dimensions of the product, if the first plate-like member, the second plate-like member, and the first and second flat plates are exposed in a free state, cracks and deformation will occur in the relevant parts, making it impossible to determine the dimensions accurately and also resulting in a decrease in design. According to this embodiment, the second member is disposed in the second space at both ends of the laminate in the second direction, which improves the mechanical strength of both ends of the laminate in the second direction and suppresses the occurrence of the above-mentioned inconveniences.

According to a further embodiment of the laminate of the present invention, the second member has a thickness that is the same as the dimension of the second space in the third direction. Here, the "same thickness" in the present invention literally refers to a state in which the second member has a thickness that is the same as the dimension of the second space in the third direction, but preferably also includes a state in which the second member has a thickness that is approximately the same as the dimension of the second space in the third direction.

According to this embodiment, the compressive force acting on the laminate can be borne more effectively by the second member. This can further improve the mechanical strength of the laminate.

According to a further embodiment of the laminate of the present invention, the projection of the second member on the virtual projection plane when viewed from one side in the first direction and the projection of the second space on the virtual projection plane have the same shape. Here, the "same shape" in the present invention refers to an embodiment in which the area is also the same, and preferably includes an embodiment in which the projection of the second member on the virtual projection plane and the projection of the second space on the virtual projection plane have approximately the same shape, in addition to an embodiment in which the projection of the second member on the virtual projection plane and the projection of the second space on the virtual projection plane have the same shape.

According to this embodiment, the compressive force acting on the laminate can be borne more effectively by the second member. This can further improve the mechanical strength of the laminate.

According to a further embodiment of the laminate of the present invention, the first and/or second flat plate is wood having a fiber direction along the second direction. At least one of the first and/or second flat plates is arranged on the first and/or second surface side of the first plate-like member and/or the first and/or second surface side of the second plate-like member so that the fiber direction intersects with the extension direction of the recess.

According to this embodiment, at least one of the first flat plate and the second flat plate can be effectively prevented from bending (deflection) on the recess. In other words, the first flat plate and the second flat plate arranged at the top and bottom of the laminate can be effectively prevented from rippling. This effectively prevents deterioration of the design and workability of the laminate.

The present invention makes it possible to achieve both weight reduction and improved mechanical strength.

1 is an exploded perspective view showing an outline of the configuration of a laminated veneer lumber 1 according to an embodiment of the present invention. 1 is a side view of a laminated veneer lumber 1 according to the present embodiment, viewed from one side in the orthogonal direction DV1 or fiber direction DF3. FIG. 2 is an external view showing the appearance of the corrugated veneer 2. FIG. 4 is a view taken in the direction of arrow A in FIG. 3 . FIG. 2 is a perspective view showing the appearance of a blade 12. 2 is a three-view diagram showing an outline of the configuration of a blade 12. FIG. FIG. 2 is an explanatory diagram showing how corrugated veneer 2 is cut out from log PW. 1 is an explanatory diagram showing how pieces of wood 8, 10 are placed in grooves 22 of a corrugated veneer 2. FIG. 1 is an explanatory diagram showing how a plurality of corrugated veneers 2, 2, 2, ... are stacked. 1 is an explanatory diagram showing a state in which a plurality of corrugated veneers 2, 2, 2, ... are stacked. 1 is an explanatory diagram showing a state in which planar veneers 4, 6 are laminated on the uppermost and lowermost surfaces of a plurality of laminated corrugated veneers 2, 2, 2, .... FIG. 2 is an external view showing the appearance of planar veneers 4 and 6. This is an explanatory diagram showing a case where wooden pieces 8', 10' having a length longer than the length of the corrugated veneer 2 in the direction along the perpendicular direction DV1 are used. 1 is an exploded perspective view showing an outline of the configuration of a modified laminated veneer lumber 100. FIG. 13 is a side view of a modified laminated veneer lumber 200 as viewed from one side in the orthogonal direction DV1 or fiber direction DF3. FIG. 13 is a side view of a modified laminated veneer lumber 300 as viewed from one side in the orthogonal direction DV1 or fiber direction DF3. FIG. 4 is a side view of a modified laminated veneer lumber 400 as viewed from one side in the orthogonal direction DV1 or fiber direction DF3. FIG. 13 is an explanatory diagram showing the arrangement of modified wooden pieces 508, 510 in the grooves 22 of the corrugated veneer 2. FIG. 5 is a side view of a modified laminated veneer lumber 500 as viewed from one side in the orthogonal direction DV1 or fiber direction DF3. FIG. 13 is an explanatory diagram showing the arrangement of modified wooden pieces 608, 610 in the grooves 22 of the corrugated veneer 2. FIG. 6 is a side view of a modified laminated veneer lumber 600 as viewed from one side in the orthogonal direction DV1 or fiber direction DF3. FIG. FIG. 7 is an exploded view showing a schematic configuration of a modified laminated veneer lumber 700.

Next, the best mode for carrying out the present invention will be explained using examples.

As shown in Figs. 1 and 2, the laminated veneer lumber 1 according to the embodiment of the present invention comprises a plurality of corrugated veneers 2, 2, 2, ... stacked in the thickness direction (the vertical direction in Figs. 1 and 2), planar veneers 4, 6 arranged at the top and bottom in the stacking direction, and a plurality of wood pieces 8, 8, 8, ..., 10, 10, 10, ... arranged between the corrugated veneers 2, 2, 2, ... or between the planar veneers 4, 6 and the corrugated veneers 2, 2. The laminated veneer lumber 1 corresponds to the "laminated body" in the present invention, the corrugated veneer 2 corresponds to the "first plate-like member" and the "second plate-like member" in the present invention, the planar veneers 4, 6 correspond to the "first plate" and the "second plate" in the present invention, and the wood pieces 8, 10 are an example of an embodiment corresponding to the "first member" and the "second member" in the present invention.

3 and 4, the corrugated veneer 2 has a plurality of grooves 22, 22, 22, .... The plurality of grooves 22, 22, 22, ... extend in a direction perpendicular to both the fiber direction DF1 and the thickness direction DT1 of the corrugated veneer 2 (hereinafter referred to as the "orthogonal direction DV1"). As shown in FIG. 4, when the corrugated veneer 2 is viewed from one side of the orthogonal direction DV1, the grooves 22 appear alternately and continuously on the front surface 2a and the back surface 2b in the fiber direction DF1. For the sake of convenience, the surface located on the upper side of the corrugated veneer 2 in the figure is defined as the front surface 2a, and the surface located on the lower side of the corrugated veneer 2 is defined as the back surface 2b. The plurality of grooves 22, 22, 22, ... are an example of an embodiment corresponding to the "recess" in the present invention. In addition, the fiber direction DF1 corresponds to the "second direction" in the present invention, the plate thickness direction DT1 corresponds to the "third direction" in the present invention, and the orthogonal direction DV1 is an example of an embodiment corresponding to the "first direction" in the present invention. Furthermore, the front surface 2a corresponds to the "first surface" in the present invention, and the back surface 2b corresponds to the "second surface" in the present invention.

The groove 22 has a bottom surface and both side surfaces connected to the bottom surface. The bottom surface is flat, and both side surfaces have an inclination (upward inclination) that moves away from each other as they move away from the bottom surface. In other words, as shown in FIG. 4, the groove 22 has a trapezoidal shape when viewed from one side in the orthogonal direction DV1 (the cross section perpendicular to the orthogonal direction DV1 is trapezoidal).

The corrugated veneer 2 is produced by cutting a veneer Vn (see FIG. 7) cut in a strip shape from a log PW of length L2 (see FIG. 8) into a fixed length in the direction along the orthogonal direction DV1, using a veneer lathe (not shown) with a blade 12 as shown in FIG. 5 and FIG. 6. The blade 12 has a first blade 14 and a second blade 16 as shown in FIG. 5 and FIG. 6.

The first blade 14 and the second blade 16 are arranged alternately and continuously in the longitudinal direction of the blade 12 (left and right direction in FIG. 6). When viewed from one side along the longitudinal direction (left and right direction in FIG. 6), the first blade 14 has an angle of inclination from one side of the blade body 12a to the other side, and when viewed from one side along the longitudinal direction (left and right direction in FIG. 6), the second blade 16 has an angle of inclination from the other side of the blade body 12a to one side. That is, when the blade 12 is viewed from one side along the longitudinal direction (left and right direction in FIG. 6), the projection of the first blade 14 and the projection of the second blade 16 on the virtual projection plane intersect (see FIG. 6). By cutting out the log PW in a katsura peeling shape using the blade 12, a corrugated veneer 2 having a corrugated shape when viewed from one side in the orthogonal direction DV1 is cut (see FIG. 7).

The multiple corrugated veneers 2, 2, 2, ... are stacked so that the flat portions 24, 24, 24, ... of the front surface 2a abut the flat portions 24, 24, 24, ... of the back surfaces 2b of the other corrugated veneers 2, 2, 2, ... (see Figure 9). In other words, the multiple corrugated veneers 2, 2, 2, ... are stacked so as to be plane-symmetrical with respect to the abutting surfaces.

At this time, as shown in FIG. 10, the grooves 22, 22, 22, ... on the front surface 2a of the corrugated veneer 2 and the grooves 22, 22, 22, ... on the back surface 2b of the other corrugated veneer 2 facing the grooves 22, 22, 22, ... form a plurality of spaces 26, 26, 26, .... When viewed from one side in the orthogonal direction DV1, the space 26 has a hexagonal shape. The space 26 extends along the orthogonal direction DV1. In other words, the plurality of spaces 26, 26, 26, ... can be said to penetrate the stacked corrugated veneers 2, 2, 2, ... in the orthogonal direction DV1. The plurality of spaces 26, 26, 26, ... is an example of an embodiment corresponding to the "first space" in the present invention.

As shown in FIG. 11, the grooves 22 on the front surface 2a and the grooves 22 on the back surface 2b of the corrugated veneers 2, 2, 2, . . . arranged at the top and bottom in the stacking direction of the multiple corrugated veneers 2, 2, 2, . . . arranged in a stacked manner, and the planar veneers 4, 6 form multiple spaces 28, 28, 28, . . . The space 28 has a trapezoidal shape when viewed from one side of the orthogonal direction DV1. The space 28 extends along the orthogonal direction DV1. In other words, the multiple spaces 28, 28, 28, . . . can be said to penetrate the multiple stacked corrugated veneers 2, 2, 2, . . . in the orthogonal direction DV1. The multiple spaces 28, 28, 28, . . . are an example of an embodiment corresponding to the "second space" in the present invention.

The planar veneers 4, 6 are cut to a fixed length using a veneer lace (not shown) with a normal blade different from the blade 12, from a veneer (not shown) cut in a katsura-peeled shape from a log (not shown) of length L1, so that the length in the direction perpendicular to both the fiber direction DF3 (see FIG. 12) and the board thickness direction DT3 (see FIG. 12) (hereinafter referred to as the "orthogonal direction DV3") is L2 (see FIG. 12).

In other words, in this embodiment, the length of the planar veneers 4, 6 along the fiber direction DF3 (see FIG. 12) is set to the same value L2 as the length of the planar veneer 2 along the fiber direction DF1 (see FIG. 8), and the length of the planar veneers 4, 6 along the orthogonal direction DV3 (see FIG. 12) is set to the same value L1 as the length of the planar veneer 2 along the orthogonal direction DV1 (see FIG. 8). As a result, the planar veneers 4, 6 are stacked (arranged) on the front surface 2a and back surface 2b of the planar veneer 2 with their fiber direction DF3 along the fiber direction DF1 of the planar veneer 2, as shown in FIG. 1.

The pieces of wood 8, 10 are made from wood materials such as veneer and single board. As shown in FIG. 8, the pieces of wood 8, 10 have the same length as the length along the perpendicular direction DV1 of the corrugated veneer 2. That is, in this embodiment, the length of the pieces of wood 8, 10 in the longitudinal direction is set to a value L1 equal to the length of the grooves 22 of the corrugated veneer 2 in the extending direction. The pieces of wood 8, 10 also have a fiber direction DF2 along the longitudinal direction. Hereinafter, the thickness direction of the pieces of wood 8, 10 is referred to as the "thickness direction DT2", and the direction perpendicular to the fiber direction and thickness direction DT2 is referred to as the "orthogonal direction DV2".

That is, the wooden pieces 8, 10 are arranged in the spaces 26, 28 so that the fiber direction DF2 intersects with the fiber direction DF1 of the corrugated veneer 2. Furthermore, as shown in FIG. 2, the wooden piece 8 has the same shape as the space 26, i.e., a hexagonal shape, when viewed from one side in the longitudinal direction. Also, as shown in FIG. 2, the wooden piece 10 has the same shape as the space 28, i.e., a trapezoidal shape, when viewed from one side in the longitudinal direction. Here, "the same shape" refers to a configuration in which the lengths and areas of each side are equal or approximately equal.

The pieces of wood 8, 10 are arranged in the spaces 26, 26, 26, ..., 28, 28, 28, ... arranged in two rows at both ends of the fiber direction DF1, DF3 (see Figures 1 and 2) out of the multiple spaces 26, 26, 26, ..., 28, 28, 28, ... (see Figure 11) formed by arranging multiple corrugated veneers 2, 2, 2, ... and flat veneers 4, 6 in a layered manner.

The total weight of the wood pieces 8, 10 arranged in the spaces 26, 26, 26, ..., 28, 28, 28, ... is set to be smaller than the weight of the corrugated veneer 2, which has a volume equivalent to the total volume of the spaces 26, 26, 26, ..., 28, 28, 28, .... This configuration can be realized, for example, by using a material with a smaller specific gravity than the corrugated veneer 2 as the wood pieces 8, 10, or by adjusting the number of wood pieces 8, 10 used.

Next, a method for manufacturing the laminated veneer lumber 1 having the above-mentioned configuration will be described. First, a veneer lace (not shown) having a blade 12 is used to cut a veneer Vn (see FIG. 7) cut from a log PW of length L2 in a katsura-peel shape to a fixed length so that the length in the direction along the orthogonal direction DV1 is L1 (see FIG. 8), thereby preparing a plurality of corrugated veneers 2, 2, 2, ..., and a veneer lace (not shown) having a normal blade different from the blade 12 is used to cut a veneer (not shown) cut from a log (not shown) of length L2 in a katsura-peel shape to a fixed length so that the length in the direction along the orthogonal direction DV3 is L1 (see FIG. 12), thereby preparing a plurality of planar veneers 4, 4, 4, ..., 6, 6, 6, .... In addition, multiple pieces of wood 8, 8, 8, ..., 10, 10, 10, ... each having a length L1 and a hexagonal cross-section perpendicular to the longitudinal direction are prepared by cutting or pressing a wood material such as veneer or single board.

At this time, adhesive is applied by a spreader or the like to the contact surfaces (e.g., the flat portion 24 of the corrugated veneer 2) of the corrugated veneer 2, 2, 2, ... and the planar veneer 4, 6 that will come into contact with each other in the subsequent process, and to the grooves 22, 22, 22, ... of the corrugated veneer 2, 2, 2, ... in which the wooden pieces 8, 8, 8, ..., 10, 10, 10, ... or the wooden pieces 8, 8, 8, ..., 10, 10, 10, ... will be placed.

Then, the planar veneer 6 to which the adhesive has been applied, the multiple corrugated veneers 2, 2, 2, ..., and the planar veneer 4 are stacked in that order. That is, the multiple corrugated veneers 2, 2, 2, ... and the planar veneers 4, 6 are stacked in such a way that the stacked multiple corrugated veneers 2, 2, 2, ... are sandwiched between the planar veneers 4, 6.

At this time, among the multiple spaces 28, 28, 28, ... formed between the planar veneers 4, 6 and the corrugated veneer 2, and the multiple spaces 26, 26, 26 formed between the multiple corrugated veneers 2, 2, 2, ..., the multiple wood pieces 8, 8, 8, ..., 10, 10, 10, ... are arranged in two rows of spaces 26, 26, 26, ..., 28, 28, 28, ... that are linearly arranged in the stacking direction (board thickness direction DT1, DT3) at both ends of the fiber direction DF1, DF3 (see Figure 11) (see Figure 2). The multiple corrugated veneers 2, 2, 2, ... are stacked so that they are plane-symmetrical with respect to the abutting surface (flat portion 24).

The planar veneer 6, the corrugated veneers 2, 2, 2, ..., and the planar veneer 4, which are stacked with multiple pieces of wood 8, 8, 8, ..., 10, 10, 10, ... arranged between each layer, are then subjected to a pressing force in the vertical direction (stacking direction, board thickness direction DT1, DT3) using a hot press or the like, thereby completing the production of the laminated veneer lumber 1.

Since multiple pieces of wood 8, 8, 8, ..., 10, 10, 10, ... are arranged in the two rows of spaces 26, 26, 26, ..., 28, 28, 28, ... at both ends of the fiber directions DF1, DF3, these multiple pieces of wood 8, 8, 8, ..., 10, 10, 10, ... can bear part of the pressing force acting on the laminated veneer lumber 1 when the laminated veneer lumber 1 is hot-pressed. This improves the compressive strength of the laminated veneer lumber 1 when the laminated veneer lumber 1 is hot-pressed, compared to a conventional configuration in which multiple pieces of wood 8, 8, 8, ..., 10, 10, 10, ... are not arranged. In addition, since the multiple wood pieces 8, 8, 8, ..., 10, 10, 10, ... are arranged in a straight line in the same direction as the direction of application of the clamping force, i.e., in the plate thickness directions DT1, DT3 (see Figure 2), the clamping force acting on the laminated veneer lumber 1 can be effectively borne. This further improves the compressive strength of the laminated veneer lumber 1. Furthermore, the multiple wood pieces 8, 8, 8, ..., 10, 10, 10, ... can improve the bending strength and bending modulus of the laminated veneer lumber 1.

The total weight of the wood pieces 8, 10 arranged in the spaces 26, 26, 26, ..., 28, 28, 28, ... is set to be less than the weight of the corrugated veneer 2, which has a volume equivalent to the total volume of the spaces 26, 26, 26, ..., 28, 28, 28, ..., so that the weight can be reduced compared to a laminated veneer lumber of the same thickness that does not have spaces 26, 26, 26, ..., 28, 28, 28, ... inside.

In addition, when the ends of the laminated veneer lumber 1 in the fiber directions DF1 and DF3 are cut to determine the dimensions of the product, the spaces 26 and 28 are prevented from being exposed at the ends, which effectively prevents cracks and deformations from occurring at the ends. This allows for accurate dimensions to be achieved as a product, while preventing a loss of design.

Furthermore, since the laminated veneer lumber 1 is laminated in a manner in which the fiber direction DF1 of the multiple corrugated veneers 2, 2, 2, ... and the fiber direction DF3 of the planar veneers 4, 6 intersect with the fiber direction DF2 of the multiple wood pieces 8, 8, 8, ..., 10, 10, 10, ... (see Figure 1), the anisotropy of wood strength, in which the tensile strength in the same direction as the fiber directions DF1, DF2, DF3 is stronger than the tensile strength in the orthogonal direction DV1, DV2, DV3, can be utilized to effectively prevent the multiple corrugated veneers 2, 2, 2, ... and the planar veneers 4, 6 from cracking along the fiber directions DF1, DF3.
This makes it possible to improve the mechanical strength of the laminated veneer material 1.

In addition, the shape of the wood pieces 8, 10 when viewed from one side along the longitudinal direction (cross-sectional shape perpendicular to the longitudinal direction) and the shape of the spaces 26, 28 when viewed from one side in the orthogonal direction DV1 (cross-sectional shape perpendicular to the orthogonal direction DV1) are the same (hexagonal, trapezoidal), so the wood pieces 8, 10 can more effectively bear the compression force acting on the laminated veneer lumber 1 in the compression direction (vertical direction, thickness direction DT1, DT3). This further improves the mechanical strength of the laminated veneer lumber 1. In addition, the wood pieces 8 can prevent relative movement (relative positional deviation) between the stacked corrugated veneers 2, 2 in the fiber direction DF1.

In addition, since the planar veneers 4, 6 are arranged on the top and bottom surfaces of the laminated veneer lumber 1, the grooves 22 and flat parts 24 of the corrugated veneer 2 do not appear on the front and back surfaces of the laminated veneer lumber 1 as a product, improving the design and workability of the laminated veneer lumber 1 as a product. Here, the planar veneers 4, 6 are stacked (arranged) on the front and back surfaces 2a and 2b of the corrugated veneer 2 in such a manner that their fiber direction DF3 intersects with the extension direction of the grooves 22, 22, 22, ... (the perpendicular direction DV1 of the corrugated veneer 2), so that the planar veneers 4, 6 can be effectively prevented from bending (deflecting) on the grooves 22, 22, 22, ... parts. In other words, the planar veneers 4, 6 can be effectively prevented from being stacked (arranged) on the front and back surfaces 2a and 2b of the corrugated veneer 2 in a wavy manner. This effectively prevents deterioration of the design and workability of the laminated veneer lumber 1.

In this embodiment, the wood pieces 8, 10 are used that have the same length as the length in the direction along the orthogonal direction DV1 of the corrugated veneer 2, but this is not limited to this. For example, as shown in FIG. 13, wood pieces 8', 10' that have a length longer than the length (L1) in the direction along the orthogonal direction DV1 of the corrugated veneer 2 may be used, or as shown in FIG. 14, a modified laminated veneer material 100, wood pieces 108, 110 that have a length shorter than the length (L1) in the direction along the orthogonal direction DV1 of the corrugated veneer 2 may be used. The laminated veneer material 100 is an example of an embodiment corresponding to the "laminate" in the present invention.

When using wood pieces 8', 10' having a length longer than the length (L1) of the corrugated veneer 2 in the orthogonal direction DV1, as shown in FIG. 13, it is possible to extend the corrugated veneer 2 in the orthogonal direction DV1 by using the parts of the wood pieces 8', 10' protruding from the first and second spaces 26, 28 in the orthogonal direction DV1. This makes it unnecessary to connect the corrugated veneer 2 to each other using tape or the like when extending the corrugated veneer 2 in the orthogonal direction DV1. As a result, it is possible to suppress the occurrence of inconveniences such as the tape peeling off and the connection between the corrugated veneer 2 being released in the later process. In addition, it is possible to effectively prevent malfunctions of the device caused by the peeled tape. In this way, by stacking a plurality of corrugated veneer 2 extended in the orthogonal direction DV1, it is possible to manufacture a laminated veneer lumber 1 having a length that is an integer multiple of the length L1 in the orthogonal direction DV1. The piece of wood 8' corresponds to the "first member" in this invention, and the piece of wood 10' corresponds to the "second member" in this invention.

In addition, when using wood pieces 108, 110 having a length shorter than the length (L1) in the direction along the orthogonal direction DV1 of the corrugated veneer 2, as shown in FIG. 14, a configuration can be used in which multiple wood pieces 108, 108, 108, ..., 110, 110, 110, ... are arranged in one space 26, 28. Here, the wood pieces 108, 110 can be configured to use a wood material having a density equal to or lower than the density of the corrugated veneer 2 and the planar veneer 4, 6. It goes without saying that the wood pieces 108, 110 may use wood materials having a density greater than the density of the corrugated veneer 2 and the planar veneer 4, 6 as long as the total weight of the multiple wood pieces 108, 108, 108, ..., 110, 110, 110, ... is smaller than the weight of the corrugated veneer 2 having a volume equivalent to the total volume of the multiple spaces 26, 26, 26, ..., 28, 28, 28, .... In addition, a configuration may be adopted in which there are gaps between the multiple wood pieces 108, 108, 108, ..., 110, 110, 110, ... arranged in one space 26, 28. With this configuration, it is possible to achieve even greater weight reduction compared to the laminated veneer material 1 using the wood pieces 8, 10. If at least one wood piece 108 or wood piece 110 is arranged so as to protrude from the space 26 or space 28 in the orthogonal direction DV1, it is possible to add (extend) the corrugated veneer 2 in the orthogonal direction DV1 using the part of the wood piece 108 or wood piece 110 protruding from the space 26 or space 28 in the orthogonal direction DV1. This makes it unnecessary to connect the corrugated veneer 2 to each other using tape or the like when adding (extending) the corrugated veneer 2 to the orthogonal direction DV1. As a result, it is possible to prevent the occurrence of inconveniences such as the tape or the like peeling off and the connection between the corrugated veneer 2 being released in a later process. Furthermore, malfunctions of the device caused by the peeled tape can be effectively prevented. In this way, by stacking multiple corrugated veneers 2 that are joined (extended) in the orthogonal direction DV1, a laminated veneer lumber 100 having a length in the orthogonal direction DV1 that is an integer multiple of the length L1 can be manufactured. The wood piece 108 corresponds to the "first member" in this invention, and the wood piece 110 is an example of an embodiment corresponding to the "second member" in this invention.

In the two modified examples described above, one corrugated veneer 2 of a fixed size (length L1) is joined (extended) in the orthogonal direction DV1, but it goes without saying that a configuration in which multiple corrugated veneers 2 having lengths less than the fixed size (random lengths) are joined (extended) in the orthogonal direction DV1 until they reach the fixed size (length L1) may also be used.

In this embodiment and the above-mentioned modified example, multiple pieces of wood 8, 8, 8, ..., 10, 10, 10, ... are arranged in two rows of spaces 26, 26, 26, ..., 28, 28, 28, ... at both ends of the fiber direction DF1 or the orthogonal direction DV3, but this is not limited to this. For example, in addition to the two rows of spaces 26, 26, 26, ..., 28, 28, 28, ... at both ends of the fiber directions DF1, DF3, or excluding the two rows of spaces 26, 26, 26, ..., 28, 28, 28, ... at both ends of the fiber directions DF1, DF3, a plurality of wooden pieces 8, 8, 8, ..., 10, 10, 10, ... may be arranged in one or more rows of spaces 26, 26, 26, ..., 28, 28, 28, ... arranged in a straight line in the stacking direction (board thickness direction DT1, DT3) in the center of the fiber directions DF1, DF3, or a plurality of wooden pieces 8, 8, 8, ..., 10, 10, 10, ... may be arranged randomly in the plurality of spaces 26, 26, 26, ..., 28, 28, 28, .... As an example of randomly arranging multiple wood pieces 8, 8, 8, ..., 10, 10, 10, ..., for example, as shown in a modified veneer laminated lumber 200 illustrated in Figure 15, multiple wood pieces 8, 8, 8, ... can be arranged in a straight line in adjacent spaces 26, 26, 26, ... among the multiple spaces 26, 26, 26, ... that are arranged along diagonal directions DS1, DS2 having a predetermined inclination angle with respect to the fiber directions DF1, DF3 and the board thickness directions DT1, DT3. According to this configuration, when the spaces 26, 26, 26, ... in which the plurality of wood pieces 8, 8, 8, ... are arranged are viewed from one side of the orthogonal direction DV1 (or fiber direction DF3), the virtual connecting lines Lcv1, Lcv2 connecting the centroids Ca of the spaces 26, 26, 26, ... are straight lines, and although they are inclined with respect to the board thickness directions DT1, DT3, the plurality of wood pieces 8, 8, 8, ... are arranged in a continuous straight line, and therefore, a part of the pressing force acting on the laminated veneer lumber 1 can be borne. This improves the compressive strength of the laminated veneer lumber 1. The laminated veneer lumber 200 is an example of an embodiment corresponding to the "laminate" in the present invention.

In the present embodiment and the above-mentioned modified example, the multiple corrugated veneers 2, 2, 2, ... and the planar veneers 4, 6 are laminated in such a manner that the laminated multiple corrugated veneers 2, 2, 2, ... are sandwiched between the planar veneers 4, 6, but this is not limited to the above. For example, as shown in the modified laminated veneer material 300 illustrated in FIG. 16, the planar veneer 304 and the corrugated veneer 302 may be alternately laminated, or as shown in the modified laminated veneer material 400 illustrated in FIG. 17, the planar veneer 404 and two corrugated veneers 402, 402 may be alternately laminated. Here, the corrugated veneers 302, 402 have the same configuration as the corrugated veneer 2, and the planar veneers 304, 404 have the same configuration as the planar veneers 4, 6. Although not shown, it goes without saying that two or more planar veneers 404, 404, ... and three or more corrugated veneers 402, 402, 402, ... may be alternately laminated. In this case, it goes without saying that it is desirable to arrange the planar veneer 404 at least on the uppermost part of the laminated veneer material 400. The laminated veneer 300, 400 corresponds to the "laminate" in the present invention, the corrugated veneer 302 and one of the two or more corrugated veneers 402, 402, ... correspond to the "first plate-like member" in the present invention, the remaining corrugated veneers 402, 402, ... except for one of the two or more corrugated veneers 402, 402, ..., and the remaining planar veneers 304, 404 except for the planar veneers 304, 404 stacked (arranged) at the top and bottom of the laminated veneer 300, 400 correspond to the "second plate-like member" in the present invention, and the planar veneers 304, 404 stacked (arranged) at the top and bottom of the laminated veneer 300, 400 are an example of an embodiment corresponding to the "first plate" and "second plate" in the present invention.

In this embodiment and the above-mentioned modified example, the wooden pieces 8, 10, 108, 110 are configured so that their shapes when viewed from one side in the longitudinal direction are the same as the shapes of the spaces 26, 28, but this is not limited to the above. For example, the wooden pieces 8, 10 may be configured so that their shapes when viewed from one side in the longitudinal direction are similar to the shapes of the spaces 26, 28. In other words, when the laminated veneer lumber 1, 100, 200, 300, 400 is viewed from one side in the orthogonal directions DV1, DV3, there may be a gap between the spaces 26, 28 and the wooden pieces 8, 10, 108, 110.

Alternatively, the wood pieces 8, 10, 108, 110 may be configured to have a shape different from the spaces 26, 28 when viewed from one side along the longitudinal direction. For example, as shown in a modified laminated veneer lumber 500 in FIG. 19, the wood pieces 508, 510 may be configured to have a rectangular shape when viewed from one side along the longitudinal direction (see also FIG. 18), or as shown in a modified laminated veneer lumber 600 in FIG. 21, the wood pieces 608, 610 may be configured to have a substantially elliptical shape when viewed from one side along the longitudinal direction (see also FIG. 20). The laminated veneer lumber 500, 600 corresponds to the "laminated body" in the present invention, the wood pieces 508, 608 correspond to the "first member" in the present invention, and the wood pieces 510, 610 correspond to the "second member" in the present invention.

In this embodiment and the above-mentioned modified example, the pieces of wood 8, 10, 108, 110, 508, 510, 608, 610 are configured to have a fiber direction DF2 along the longitudinal direction, but the pieces of wood 8, 10, 108, 110, 508, 510, 608, 610 may also be configured to have a fiber direction DF2 perpendicular to the longitudinal direction.

In this embodiment and the above-mentioned modified example, the planar veneers 4, 6, 304, 404 are laminated (placed) on both the top and bottom of the laminated veneer lumber 1, 100, 200, 300, 400, 500, 600, but the planar veneers 4, 6, 304, 404 may be laminated (placed) only on the top of the laminated veneer lumber 1, 100, 200, 300, 400, 500, 600.

In the present embodiment and the above-mentioned modified example, only one planar veneer 4, 6, 304, 404 is laminated (placed) at the top and bottom of the laminated veneer lumber 1, 100, 200, 300, 400, 500, 600, but two or more planar veneers 4, 6, 304, 404 may be laminated (placed) at the top and bottom of the laminated veneer lumber 1, 100, 200, 300, 400, 500, 600. In this case, at least one planar veneer 4, 6, 304, 404 laminated (placed) at the top and bottom of the laminated veneer lumber 1, 100, 200, 300, 400, 500, 600 may be laminated (placed) so that its fiber direction DF3 intersects with the extension direction of the grooves 22, 22, 22, ...

In this embodiment and the above-mentioned modified example, the corrugated veneer 2 is cut out from the log PW in a stripped shape using a veneer slicer (not shown) with a blade 12, but this is not limited to the above. For example, the corrugated veneer 2 may be cut out using a slicer equipped with a blade having blades similar to the first blade 14 and the second blade 16, or the corrugated veneer 2 may be formed by pressing. With this configuration, it is also possible to manufacture a corrugated veneer 2 in which the grooves 22 appear alternately and continuously on the front surface 2a and back surface 2b in the perpendicular direction DV1 when the corrugated veneer 2 is viewed from one side of the fiber direction DF1.

In the present embodiment and the above-mentioned modified example, the groove 22 of the corrugated veneer 2 has a U-shaped (trapezoidal) cross section with a flat bottom and both inclined side surfaces when viewed from one side of the orthogonal direction DV1, but is not limited thereto. For example, the groove 22 of the corrugated veneer 2 may have a V-shaped cross section perpendicular to the orthogonal direction DV1. Alternatively, the groove 22 of the corrugated veneer 2 may have a U-shaped cross section with an arc-shaped bottom when viewed from one side of the orthogonal direction DV1. When the groove 22 has a V-shaped cross section, the space 26 has a diamond shape when viewed from one side of the orthogonal direction DV1, and the space 28 has a triangular shape when viewed from one side of the orthogonal direction DV1. Furthermore, when the groove 22 has a U-shaped cross section with an arc-shaped bottom surface, the space 26 has a circular or elliptical shape when viewed from one side in the orthogonal direction DV1, and the space 28 has a semicircular or semielliptical shape when viewed from one side in the orthogonal direction DV1.

In the present embodiment and the above-described modified example, the wooden pieces 8, 10, 108, 110, 508, 510, 608, and 610 are made of wood materials such as veneer and single board, but this is not limited to this. For example, the wooden pieces 8, 10, 108, 110, 508, 510, 608, and 610 may be made of wood materials such as medium density fiberboard (MDF) or resin materials such as phenol.

In the present embodiment and the above-mentioned modified example, the method for manufacturing the laminated veneer 1 is configured such that, each time a corrugated veneer 2 coated with adhesive is laminated, multiple pieces of wood 8, 8, 8, ..., 10, 10, 10, ... are arranged in the predetermined grooves 22, 22, 22, ... on the front surface 2a of the corrugated veneer 2, but this is not limited to the above. For example, multiple pieces of wood 8, 8, 8, ..., 10, 10, 10, ... may be bonded in advance to the predetermined grooves 22, 22, 22, ... on the front surface 2a and/or back surface 2b of the corrugated veneer 2 with adhesive, and the corrugated veneers 2, 2, 2, ... to which the multiple pieces of wood 8, 8, 8, ..., 10, 10, 10, ... are bonded may be laminated. With this configuration, the multiple laminated corrugated veneers 2, 2, 2, ... before pressing can be effectively prevented from shifting relative to each other in the direction along the fiber direction DF1.

In the present embodiment and the above-mentioned modified example, adhesive is applied to both the grooves 22, 22, 22, ... of the corrugated veneer 2 and the wood pieces 8, 8, 8, ..., 10, 10, 10, ..., but this is not limited to the above. For example, adhesive may be applied to only one of the grooves 22, 22, 22, ... of the corrugated veneer 2 and the wood pieces 8, 8, 8, ..., 10, 10, 10, ....

In the present embodiment and the above-mentioned modified example, the laminated veneer lumber 1, 100, 200, 300, 400, 500, 600 is configured to have a plurality of corrugated veneers 2, 2, 2, ... cut from the same material, i.e., the same type of log, but this is not limited to this. For example, as shown in the modified example of the laminated veneer lumber 700 illustrated in FIG. 22, the laminated veneer lumber 700 may be configured to have a plurality of corrugated veneers 2A, 2B, 2C, ... of different materials, i.e., a plurality of corrugated veneers 2A, 2B, 2C, ... cut from different logs. In this case, the wood pieces 8, 10 may be set so that the total weight is smaller than the total weight of each of the corrugated veneers 2A, 2B, 2C, ... that have a volume equal to the total volume of each of the plurality of grooves 22A, 22B, 22C, ... of each of the corrugated veneers 2A, 2B, 2C, .... The laminated veneer material 700 corresponds to the "laminate" in this invention, any one of the corrugated veneers 2A, 2B, 2C, ... corresponds to the "first plate-like member" in this invention, the remaining corrugated veneers 2A, 2B, 2C, ... except for one of the corrugated veneers 2A, 2B, 2C, ... correspond to the "second plate-like member" in the name of this invention, and the grooves 2A, 22B, 22C, ... are an example of an embodiment that corresponds to the "recess" in this invention.

This embodiment shows an example of a form for implementing the present invention. Therefore, the present invention is not limited to the configuration of this embodiment. The correspondence between each component of this embodiment and each component of the present invention is shown below.

1. Laminated veneer lumber (laminate)
2. Corrugated veneer (first plate-like member, second plate-like member)
2A: Corrugated veneer (first plate-like member, second plate-like member)
2B Corrugated veneer (first plate-like member, second plate-like member)
2C Corrugated veneer (first plate-like member, second plate-like member)
2a Surface (first surface)
2b Back side (second surface)
4. Planar veneer (first flat plate)
6 Planar veneer (second flat plate)
8 Wood piece (first member)
10 Wood piece (second member)
8' Wood piece (first member)
10' Wood piece (second member)
12 Blade 12a Blade body 14 First blade 16 Second blade 22 Groove (recess)
22A Groove (recess)
22B Groove (recess)
22C Groove (recess)
24 Flat portion 26 Space (first space)
28 Space (Second Space)
100 Laminated veneer lumber (laminate)
108 Wood piece (first member)
110 Wood piece (second member)
200 Laminated veneer lumber (laminate)
300 Laminated veneer lumber (laminate)
302 Corrugated single plate (first plate-like member)
304 Planar single plate (second plate-like member, first flat plate, second flat plate)
400 Laminated veneer lumber (laminate)
402 Corrugated veneer (first plate-like member, second plate-like member)
404 Planar single plate (second plate-like member, first flat plate, second flat plate)
500 Laminated veneer lumber (laminate)
508 Wood piece (first member)
510 Wood piece (second member)
600 Laminated veneer lumber (laminate)
608 Wood piece (first member)
610 Wood piece (second member)
700 Laminated veneer lumber (laminate)
PW Log Vn Veneer DF1 Grain direction (second direction)
DF2 Fiber direction DF3 Fiber direction DT1 Plate thickness direction (third direction)
DT2 Plate thickness direction DT3 Plate thickness direction DV1 Orthogonal direction (first direction)
DV2 Orthogonal direction DV3 Orthogonal direction L1 Length L2 Length Ca Centroid (Centroid)
DS1 Diagonal direction DS2 Diagonal direction Lcv1 Virtual connecting line (Virtual connecting line)
Lcv2 Virtual connection line (virtual connection line)

Claims (14)

at least one first plate-like member having a first surface extending in a first direction and a second direction perpendicular to the first direction, and a second surface extending in the first and second directions and facing the opposite side to the first surface, the first plate-like member having a shape on a virtual projection plane when viewed from one side in the first direction that has a wave shape in which recesses appear alternately and continuously on the first surface and the second surface in the second direction;
a second plate-like member disposed on the first surface side or the second surface side of the first plate-like member;
a first member disposed in at least one of a plurality of first spaces surrounded by the plurality of recesses arranged in the second direction and the second plate-like member;
Equipped with
The first member has a total weight less than the weight of the first plate -like member having a volume equal to the total volume of the first spaces, and has a length shorter than the length of the first spaces in the first direction.
Laminate. at least one first plate-like member having a first surface extending in a first direction and a second direction perpendicular to the first direction, and a second surface extending in the first and second directions and facing the opposite side to the first surface, the first plate-like member having a shape on a virtual projection plane when viewed from one side in the first direction that has a wave shape in which recesses appear alternately and continuously on the first surface and the second surface in the second direction;
a second plate-like member disposed on the first surface side or the second surface side of the first plate-like member;
a first member disposed in at least one of a plurality of first spaces surrounded by the plurality of recesses arranged in the second direction and the second plate-like member;
Equipped with
the first plate-shaped member and/or the second plate-shaped member are wood having a fiber direction along the second direction,
The first member has a total weight smaller than the weight of the first plate-shaped member having a volume equal to the total volume of the first spaces, and is made of wood having a fiber direction along the first direction.
Laminate. 3. The laminate according to claim 1 or 2 , comprising a plurality of the first and second plate-like members,
The first spaces are arranged in a plurality of spaces in the second direction and in a third direction perpendicular to both the first and second directions,
the first member is disposed contiguously in the first space adjacent to the first space in the third direction on a virtual projection plane when viewed from one side in the first direction. The laminate according to claim 3 , wherein the first members are disposed in the first spaces at least on both ends in the second direction. 5. The laminate according to claim 1, comprising a plurality of the first and second plate-like members,
The first spaces are arranged in a plurality of spaces in the second direction and in a third direction perpendicular to both the first and second directions,
The first member is a laminate in which the first space is adjacently arranged in a direction intersecting both the second and third directions among the projections of the first space on a virtual projection plane when viewed from one side of the first direction, and the first space is arranged in a positional relationship in which a virtual connecting line connecting the centroids of the projections of the first spaces forms a straight line. The laminate according to claim 1 , wherein the first member has a thickness that is the same as a dimension of the first space in the third direction. the second plate-like member has the same wave shape as the first plate-like member, and is disposed on the first surface side or the second surface side of the first plate-like member so as to be plane-symmetrical with respect to a contact surface with the first plate-like member;
the first space is a space surrounded by the recess of the first plate-like member and the recess of the second plate-like member,
The laminate described in any one of claims 1 to 6, wherein the first member has a total weight that is smaller than the sum of the weight of the first plate-like member having a volume equal to the sum of the volumes of the recesses of the first plate-like member and the weight of the second plate-like member having a volume equal to the sum of the volumes of the recesses of the second plate-like member. The laminate described in any one of claims 1 to 7, wherein a projection of the first member on a virtual projection plane when viewed from one side of the first direction and a projection of the first space on the virtual projection plane have the same shape. A laminate as described in any one of claims 1 to 8, further comprising at least one first flat plate arranged on the first surface side of the first or second plate-shaped member arranged on one end side of the third direction, and/or at least one second flat plate arranged on the second surface side of the first or second plate-shaped member arranged on the other end side of the third direction. The device further includes a second member disposed in at least one of a plurality of second spaces surrounded by the first recess and the first and/or second flat plate,
The stack according to claim 9 , wherein the second member has a total weight equal to or less than a weight of the first and/or second plate-like members having a volume equal to a total volume of the second spaces. The laminate according to claim 10 , wherein the second members are disposed in the second spaces at least at both ends in the second direction. The laminate according to claim 10 or 11 , wherein the second member has a thickness that is the same as a dimension of the second space in the third direction. The laminate described in any one of claims 10 to 12, wherein a projection of the second member on a virtual projection plane when viewed from one side of the first direction and a projection of the second space on the virtual projection plane have the same shape. The first and/or second planks are wood having a fiber direction along the second direction,
A laminate as described in any one of claims 10 to 13, wherein at least one of the first and/or second flat plates is arranged on the first and/or second surface side of the first plate-shaped member and /or the first and/or second surface side of the second plate-shaped member so that the fiber direction intersects with the extension direction of the recess .

Images