JPH09248803A - Plywood, plywood panel, and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To raise stiffness to a load from an oblique direction to a plywood. SOLUTION: A veneer 1 having a fibrous direction wherein a fibrous line 2 is inclined to a major axis direction (direction Y) is manufactured, and a plywood is manufactured by combining this veneers with another veneer. That is, two sheets of veneers having the fibrous direction inclined to the major axis direction in the same way as the veneer 1 are made core sheets 1A, 1B, and splice core sheets 5A, 5B consisting of conventional plywoods are laminated respectively on their both sides. Further, front sheet 4A consisting of conventional plywood is laminated on the splice core sheet 5A, and a rear sheet 4B consisting of traditional plywood is laminated on an under side of the splice core sheet 5B. In this case, a veneer 7 is manufactured by laminating fibrous directions of adjacent veneers at right angles with each other or crossing mutually. Since the veneer having the fibrous direction inclined to the major axis direction is used for the plywood 7, the plywood 7 has high stiffness to a load from a oblique direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plywood laminated with a plurality of veneers, a plywood panel using the plywood, and a method for manufacturing the plywood, and particularly suitable as a structural plywood or plywood panel for construction civil engineering. It is something.

[0002]

2. Description of the Related Art Domestically produced plywood, which was first developed in the latter half of the Meiji era, is now used as a plywood in a wide range of fields such as construction, industry and daily necessities. For example, there are various types of plywood used for base materials such as roofs and walls for construction and civil engineering, partitioning materials, siding materials, walls and top plates for vehicles and aircraft, and cases for household appliances and daily necessities. And many kinds of plywood are offered to the market. Especially in Japan recently, there is a strong tendency to modernize houses, and along with this, the demand for plywood on walls and floors has increased, and as a result, special characteristics for satisfying the requirements for fireproofness, insect repellency, and antiseptic properties of those plywoods have been increasing. Development of plywood is also in progress. Also,
A wide variety of decorative plywood has been developed, and its use as interior decoration is also progressing. As described above, the properties required for plywood today are diverse. However,
The basically required property of plywood is so-called load resistance, that is, rigidity with respect to load. First, it is required to increase this rigidity. In particular, high rigidity is required for structural plywood used for construction and vehicles including aircraft.

[0003] By the way, plywood is made by cutting domestic timber such as sina, beech, oak, larch, and spruce, and raw timber of external materials such as lauan and bay pine into a predetermined length in the longitudinal direction, and then cutting into the predetermined length. After fixing both ends of the raw wood in the longitudinal direction to the rotary shaft, the surface of the raw wood rotating with the rotation of the rotary shaft is cut by a cutter or the like so as to be sliced into a thickness according to the application. Then, the cut sliced veneer is wound up to manufacture a roll-shaped veneer. In this case, the veneer is wound in the fiber (grain) direction. Then, the roll-shaped veneer wound in the fiber direction is cut in a direction perpendicular to the fiber direction with an appropriate fiber direction length to produce veneers, and the width in the longitudinal direction of these veneers. After aligning the widths in the horizontal direction, an adhesive is applied and overlapped with each other, and the plywood is manufactured by pressure bonding using a hot press, a cold press or the like.

FIG. 7 is a development view for explaining the structure of a conventional plywood, and this example shows a standard structure of 5 plies (5 sheets combined). In FIG. 7, the five veneers constituting the conventional plywood 21 are the front plate (face) 22 from the surface.
a, splint plate (cross band) 22b, core plate (core) 2
2c, a core plate 22d, and a back plate (back) 22e. These 5 veneers have a front plate 22
Innumerable fiber muscles are formed as shown by the fiber muscles 23a of a. In this case, when the fiber direction of the fiber streak 23a is the vertical direction, the fiber directions of the two wicks 22b and 22d are the horizontal direction, and the fiber directions of the core plate 22c and the back plate 22d are the vertical direction. The fiber line 23a of the front plate 22a
As shown in, the fiber streaks are not linear, and include a curved portion inclined with respect to the side of the veneer. The so-called “fiber direction” does not indicate a partial direction of these fiber lines, but indicates a direction in which the fiber lines substantially flow. As shown in FIG. 7, in the usual case, plywood is manufactured by laminating a plurality of veneers so that the fiber directions of the veneers are alternately orthogonal to each other. In addition, recently, in order to increase the strength in the long axis direction, a single plate laminated material (LVL: Laminated Veneer Lumber) in which a plurality of single plates are laminated in a state in which the fiber directions are aligned has been developed.

[0005]

The veneer forming the plywood has stronger rigidity in the fiber direction than in the non-fiber direction. Therefore, the plywood manufactured by the above method has a strong rigidity against loads from the vertical direction and the horizontal direction. However, not only longitudinal and lateral loads but also diagonal loads are applied to the structural plywood. When such a diagonal load is applied, there is a disadvantage that the conventional plywood or veneer laminated material in which the fiber directions are aligned in the vertical and horizontal directions lacks rigidity.

By the way, in the construction of a general house, a clapboard is pasted between columns, and an outer wall is formed by mortar coating from above with a lath base. Therefore, recently, a method of using plywood instead of the clapboard has been proposed. FIG. 8 is a partially cut perspective view for explaining the structure of an outer wall of a conventional house. In FIG. 8, two pillars 26A fixed to a base 25 on a foundation 24, A body difference 27 is supported on 26B, and a plurality of clap plates 28 that form the outer wall are attached from the base 25 to the body difference 27. And the strength of the pillars 26A, 26B and the outer wall is reinforced by the studs 29 and the braces 30 installed between the two pillars 26A, 26B. In this case, the stud 29 is fixed to the body difference 27 and the base 25 at approximately the center of the two pillars 26A and 26B. Further, the brace 30 is connected to the pillar 26 through the brace plate 32.
One end is fixed to B and the body difference 27, and the other end (omitted because the drawing is complicated) is fixed to the column 26A and the base 25 via a bracing plate (not shown). Although not shown in FIG. 8, the outer wall is formed by applying mortar on the clapboard 28 via a lath base.

In this case, at the construction site, in order to make the outer wall, it is necessary to strike a large number of clapboards 28 on the columns 26A and 26B one by one. Therefore, if plywood is used instead of the clapboard 28, there is an advantage that the working time for hitting the clapboard 28 can be saved. However, when a conventional plywood is used as the clapboard, there is not much difference in terms of strength between the plywood and the clapboard 28, and as in the conventional case, the studs 29, the braces 30 and the like make the slant. It is necessary to surely reinforce the strength in the direction, and no particular remarkable effect can be obtained other than shortening the working time.

Further, the columns 26A and 26B are fixed to the base 25 by fitting the tenons provided in the lower part thereof into the mortise holes provided in the base 25, but recently, as shown in FIG. , The hole-down hardware 33 that penetrates the base 25 and is fixed by the bolts embedded in the foundation 24
5 and the pillar 26 through the hole-down hardware 33
A and 26B are firmly fixed on the base 25. In this case, since the tip portion of the brace 30 and the brace plate for fixing the brace 30 are arranged in the vicinity of the hole-down hardware 33, there is also a disadvantage that the arrangement and structure of the hole-down hardware 33 become complicated. .

In view of the above problems, an object of the present invention is to provide a plywood having high rigidity with respect to a diagonal load and a plywood panel using the plywood. Furthermore, the present invention aims at providing a manufacturing method for manufacturing such a plywood.

[0010]

A first plywood according to the present invention comprises a plurality of laminated veneers (1A, 1B, 4A, 4).
B, 5A, 5B), and at least one (1A) of the plurality of veneers has an oblique fiber direction with respect to one side of the outer shape. According to the first plywood of the present invention, at least one veneer having a fiber direction oblique to one side of the outer shape (hereinafter, also simply referred to as “oblique fiber direction”) is included. There is. The veneer has strong rigidity against a load in the fiber direction. Therefore, the plywood of the present invention has a high rigidity with respect to a diagonal load (hereinafter, also simply referred to as “diagonal load”) with respect to one side of the outer shape.

In this case, the plurality of veneers includes two veneers (1A, 1B) having oblique fiber directions, and the two veneers are laminated so that the fiber directions are different from each other. Is preferred. As a result, the plywood has a high rigidity with respect to loads from both diagonal directions intersecting each other. Further, at least one veneer having the slanted fiber direction includes a core plate (1A, 1B) as a central member of the plywood, and the core plate is provided above and below the core plate with respect to one side of the outer shape. Veneer (5) having fiber directions that are substantially orthogonal or parallel to each other
A, 5B) are preferably laminated. This allows
In addition to the rigidity against the load in the oblique direction, the rigidity against the load from the direction parallel to or orthogonal to one side of the outer shape also becomes high.

Further, it is preferable that at least one veneer (1A) having the oblique fiber direction has a fiber direction intersecting with one side of the outer shape at an inclination angle of 20 ° to 70 °. . This makes it possible to obtain a plywood having high rigidity with respect to a diagonal load. If the range of this inclination angle exceeds the range of 20 ° to 70 °, sufficient rigidity cannot be obtained against a load from an oblique direction.

The second plywood according to the present invention is a plurality of laminated veneers (1A, 1B, 4A, 4B, 5A, 5).
B), of which two of the veneers (1
The fiber directions of (A, 1B) intersect obliquely. According to such a second plywood of the present invention, since the fiber directions of the two veneers (1A, 1B) intersect obliquely,
It is possible to obtain a plywood having a high rigidity against a load from both diagonal directions intersecting with each other.

Further, the plywood panel according to the present invention, as shown in FIG. 2, is the first or second plywood (7A-7) of the present invention.
C), a heat insulating material (9), and a support plate (10), and the heat insulating material (9) is scissored between the plywood (7A to 7C) and the support plate (10) to be integrated. It has been transformed. According to such a plywood panel of the present invention, the first aspect of the present invention
Alternatively, since the second plywood (7A to 7C) and the heat insulating material (9) are integrated, a plywood panel having high rigidity against a diagonal load can be obtained, and workability at the site is improved.

The first plywood manufacturing method according to the present invention is a method for manufacturing a roll-shaped veneer (53) in which the fiber direction is substantially parallel to or orthogonal to the longitudinal direction. After the step (102) and the roll-shaped veneer (53) manufactured in the first step are dried, the dried roll-shaped veneer (53) is cut to form a plurality of veneers. Second
A step (103), a third step (104) for adjusting the plurality of veneers cut in the second step according to the purpose, and a plurality of veneers adjusted in the third step. Fourth step (1) of manufacturing a rough plywood by laminating and press-bonding with a predetermined adhesive material
06) and a fifth step (107) of cutting the rough plywood produced in the fourth step into a predetermined size, and the second step thereof.
In step (103), at least one of the plurality of veneers is formed by cutting the roll-shaped veneer (53) in a direction oblique to the longitudinal direction of the roll-shaped veneer. To do.

According to the first plywood manufacturing method of the present invention, in the second step, the roll-shaped veneer (53) is cut in a direction obliquely inclined with respect to the longitudinal direction. A veneer having an oblique fiber direction with respect to is obtained. Therefore, this veneer can be used to manufacture the first or second plywood of the present invention. In addition, the second plywood manufacturing method according to the present invention includes a first step (101, 102) of cutting raw wood and winding it in a predetermined direction to manufacture a roll-shaped single plate (101), and the first step. The second step of forming a plurality of veneers by drying the roll-shaped veneer (53) manufactured in (1) and then cutting the dried roll-shaped veneer (53) in a direction orthogonal to the winding direction. (103A), a third step (104) of adjusting the plurality of veneers cut in the second step according to the purpose, and a plurality of veneers adjusted in the third step are predetermined. Fourth step (106) of manufacturing a rough plywood by laminating and pressure bonding with the adhesive material of No. 5, and fifth step (107A) of cutting the rough plywood (60) manufactured in the fourth step into a predetermined size. And, in the fifth step, the rough plywood (60) is placed in the longitudinal direction of the rough plywood. It is intended to cut in a direction inclined in order.

According to the second plywood manufacturing method of the present invention, in the second step, the roll-shaped veneer (53) is cut in a direction orthogonal to the winding direction. Since the fiber direction of the roll-shaped veneer (53) is parallel to the winding direction, the fiber direction of the veneer manufactured in this second step is orthogonal to the cut surface in this case. Coarse plywood (6 manufactured by combining veneers having such fiber directions
The fiber direction of 0) is parallel or orthogonal to the longitudinal direction of the rough joint. Then, in the fifth step, since cutting is performed in a direction obliquely inclined with respect to the longitudinal direction of the rough plywood (60), the plywood manufactured in this fifth step has a plurality of fiber directions oblique to the longitudinal direction. The single plates are laminated, and the first and second plywood of the present invention can be manufactured.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An example of an embodiment of a plywood according to the present invention will be described below with reference to FIG. FIG. 1 (a)
Shows an example of a single plate that constitutes the plywood of this example.
In (a), countless fiber streaks run on the rectangular veneer 1. The fiber (grain) direction of these fiber lines is inclined with respect to the long side 3Y or the short side 3X of the rectangle of the single plate 1 as represented by the fiber line 2. ing. Therefore, unlike the conventional veneer, innumerable fiber streaks are also observed on the side face in the major axis direction of the veneer 1 as in the side face in the single axis direction. In the following description, the X axis and the Y axis are taken in the long axis direction and the short axis direction of the single plate 1, and the Z axis is taken perpendicularly to the X axis and the Y axis.

As shown in FIG. 1A, in this example, a single plate 1
The fiber direction is formed so as to have an inclination angle with respect to the side in the Y-axis direction. Therefore, the veneer 1 has a strong rigidity against a load from a direction oblique to the X axis or the Y axis. In addition, in this example, an example of a single plate in which the fiber direction has an inclination angle close to 45 ° with respect to the Y axis is shown, but the inclination angle in the fiber direction may be within 90 °. However, Y in the fiber direction
The inclination angle with respect to the axis is preferably in the range of 20 ° to 70 °, particularly preferably in the range of 40 ° to 50 °.

FIG. 1 (b) is a developed perspective view of an example of plywood manufactured using the single plate of FIG. 1 (a). In FIG. 1 (b), the plywood 7 is arranged in order from the surface. Front plate 4A,
5A of eccentrics, 2A of eccentrics 1A, 1B of eccentrics,
Also, the back plate 4B has a structure in which six single plates are laminated. Of these five veneers, the central two core plates 1A,
1B is a veneer having an oblique fiber direction, similar to the veneer 1 of FIG. 1A, and another front plate 4A and two concentric plates 5
A, 5B and back plate 4B are conventional veneers whose fiber direction is substantially orthogonal or parallel to one side. In this case, the front plate 4A has a fiber direction parallel to the Y-axis as shown by the fiber streak 6A, and the concentric plate 5A directly superposed on the front plate 4A has a fiber direction as shown by the fiber streak 6B. Are laminated so as to have a fiber direction parallel to the X axis orthogonal to the fiber direction. Further, the two core plates 1A and 1B have fiber directions having an inclination angle close to 45 ° with respect to the Y-axis or the X-axis, as shown by respective fiber streaks 2A and 2B, and the fiber directions of the two are Stacked so that they intersect. Further, the concentric plate 5B and the concentric plate 5 laminated on the lower part thereof.
The back plate 4B that directly overlaps B has the respective fiber lines 6C and 6C.
As shown by D, they are laminated so that they have fiber directions parallel to the X axis and the Y axis, respectively, and these fiber directions are orthogonal to each other. In the following description, the fiber direction and the load direction all indicate the direction with respect to the sides of the veneer or plywood.

Plywood 7 of the present example having the above-mentioned structure
Is a veneer 1A having diagonal fiber directions that intersect each other,
Since 1B is laminated, high rigidity can be obtained with respect to the load on the plywood 7 in either the left or right diagonal direction. In addition, the plywood 7 of this example has a structure in which four veneers having fiber directions that are substantially parallel or orthogonal to each other are laminated not only in an oblique direction, but so that the fiber directions of adjacent veneers intersect with each other. Therefore, high rigidity can be obtained not only with respect to the load from the oblique direction but also with respect to the load from either the parallel direction or the orthogonal direction. Further, since the plywood 7 of this example has a strong rigidity against a load in an oblique direction as described above, when it is used in place of the construction clapboard 28 described with reference to FIG. As the brace 30, it is possible to select a thin material having small rigidity. Further, in some cases, the studs 29 and the braces 30 can be omitted. In such a case, the brace plate 32 is not required, and the hole down hardware 33 can be easily configured and installed. Further, when the clapboard is used for the outer wall of the house as in the conventional case, a gap is formed between the clapboards, and the heat insulating property is deteriorated. However, when the plywood 7 of this example is used,
There is almost no gap, and the heat insulation is improved.

The plywood 7 of this example is composed of two core plates 1A,
Only a single veneer having an oblique fiber direction was used for 1B, and conventional single veneers were used for the centering plates 5A, 5B, front plate 4A, and back plate 4B. For example, one conventional veneer is used as the core plate. use,
You may make it use the single board which has the diagonal fiber direction of this example for two concentric boards. That is, at least one veneer having an oblique fiber direction in this example may be used, and any combination is possible. Also, the number of single plates to be combined is not limited to six, and an appropriate number may be combined if necessary.

When the plywood 7 of the present example having the above-mentioned structure is actually used as an outer wall material for construction or the like, it is preferable to integrate the plywood 7 with a heat insulating material or the like. Therefore,
An example of a plywood panel formed by using a plywood similar to the plywood 7 will be described with reference to FIG. FIG. 2A shows a plan view of the plywood panel. Further, FIG. 2 (b) is shown in FIG. 2 (a).
2C shows an example in which the plywood panel of 1 is constructed for actual building of a house, and FIG. 2C is a sectional view taken along line AA of FIG. 2B. As shown in FIG. 2A, the plywood panel 8 of this example
Is heat-insulated between a plywood 7P in which three plywoods 7A to 7C similar to the plywood 7 of FIG. 1 are arranged in the longitudinal direction (Z direction) and connected to each other by an appropriate adhesive, and a support plate 10 such as a gypsum board. The material 9 is filled. The support plate 10 is fixed to the plywood 7P via a frame-shaped support frame 11 provided so as to surround the periphery of the plywood 7P.
The space formed by 1 and the support plate 10 is densely filled with the heat insulating material 9. The inner surface side of the plywood 7P that is filled with the heat insulating material 9 is divided into lateral reinforcements 13A and 13B provided at substantially equal intervals in the longitudinal direction of the plywood 7P, and the reinforcements 13A and 13B. The sections are reinforced by the reinforcing members 12A to 12F provided on the cross sections.

Further, in the outer portion of the plywood 7P to which the support frame 11 is fixed, the body difference 15, the base 14, and the left and right columns 16 are provided.
An outer edge portion 17 that is directly fixed to A and 16B is provided. In this case, as shown in FIGS. 2B and 2C, the outer surface of the support frame 11 is fitted into the two pillars 16A and 16B, the body difference 15, and the inner surface of the base 14. The horizontal and vertical sizes of the support frame 11 are set. Further, the thickness of the support frame 11 toward the inside of the room is set so that an appropriate space is formed between the support plate 10 fixed to the support frame 11 and the gypsum board 18 provided on the indoor side. As the heat insulating material 9, for example, glass wool or the like having excellent soundproofing is used.

Plywood panel 8 having the above structure
Is a plywood 7A to 7C having the same structure as the plywood 7 of FIG.
Since the plywood 7P made of the above and the heat insulating material 9 are integrated, the workability at the site is significantly improved in addition to the characteristics of the plywood 7. In addition, in this example, the plywood 7P is replaced by the reinforcing members 13A, 1A.
Although reinforced by 3B and 12A to 12F, these reinforcing materials 13A, 13B and 12A to 12F may be omitted.

Next, a first method for manufacturing plywood according to the present invention will be described with reference to FIGS. 3 and 4. FIG.
The flowchart for demonstrating the manufacturing process of the plywood 7 is shown, and in this FIG. 3, the raw wood used as the material of plywood is first conveyed from a storage place to a plywood factory. Various kinds of hardwoods and conifers can be used as the raw wood. Examples of hardwoods include
Examples include domestic timber such as China, birch, sen, beech, and oak, and external timber such as lauan. Further, as conifers, domestic timber such as larch, spruce pine, cedar, red pine, and North American bay pine, bay hemlock, spruce, southern, pine,
Examples include external materials such as larch, spruce, Scots pine produced in the North Sea, and radiata pine produced in New Zealand and Chile. These raw logs are cut into appropriate lengths in a cutting process 101. The cut raw wood is subjected to the next cutting and winding step 102, and in this step 102, a roll-shaped veneer is manufactured using a rotary lace or the like. In this case, cutting process 1
After cutting the raw wood at 01, a step of spraying steam to the cut raw wood to remove dirt on the raw wood skin and the epidermis may be inserted between the step 102 and the step. A rotary race is one in which both ends in the longitudinal direction of raw wood that has been cut to a specified length are fixed to a rotating shaft, and while the rotating shaft is rotated, the raw wood is peeled off with a cutter to form a thin veneer. In this case, the plate thickness is about 0.6 mm to 5.0 mm, and the plate thickness is set according to the material and application of the raw wood.
The veneer peeled to a predetermined plate thickness is applied to a reeling machine for winding the veneer, an unreel deck, or the like, and wound into a roll. The veneer wound into a roll is then dried in a drying and cutting step 103 using, for example, hot air, and cut into a predetermined size by a cutting machine such as a clipper.

FIG. 4A shows a plan view of the cutting machine used in the drying and cutting step 103. In this FIG. 4A, the dried roll on the rotating shaft 52 driven by the rotating mechanism 51. -Shaped veneer 53 is fixed. Then, the rotating mechanism 51 is driven to rotate the rotating shaft 52, and the single plate 53 that slides on the roller stand (not shown) is cut into a proper width by the cutter 54 driven by the cutter driving mechanism 55. The cutter 54 is installed so as to be inclined with respect to the flowing direction of the roll-shaped single plate 53, and the single plate 53 is cut diagonally by the cutter 54. The cutter 54 is configured to be rotatable on a plane parallel to the plane of the veneer 53 through a cutter driving mechanism 55. By changing the rotation angle of the cutter 54, the veneer 53 is cut in the fiber direction. The tilt angle of the surface is adjusted.

FIG. 4 (b) shows a diamond-shaped single plate 56 cut by the cutter 54 from the roll-shaped single plate 53 of FIG. 4 (a). In FIG. 4 (b), the single plate 56 is shown. The fiber direction of is inclined with respect to the cut surfaces 57a and 57b of the cutter 54. Since the veneer 56 does not become a veneer constituting the plywood in this shape, it is further cut into a rectangular shape. Therefore, using a suitable cutting machine, the cutting surface 57
A straight line 59 perpendicularly intersecting the cut surface 57b from the left end of a
a and a right end of the cut surface 57b is cut along a straight line 59b perpendicular to the cut surface 57a. Thereby, the rectangular veneer 1 in which the fiber direction is inclined with respect to the side is manufactured. When this veneer 1 is manufactured, two corners of the veneer 56 are cut out as half-end portions 56A and 56B. Since it is extremely wasteful to discard these half-end portions 56A and 56B as they are, these half-end portions 56A and 56B are effectively used as follows.

FIG. 4 (c) shows an example in which another single plate is manufactured by the half-end portions 56A, 56B of these right triangles. As shown in FIG. 4 (c), the half-end portions 56A, 5B are formed.
Since 6B has the shape of a right triangle having the same size, a rectangular veneer 1B can be manufactured by combining them and using a suitable adhesive to bond these half-end portions 56A and 56B together. The fiber direction of the veneer 1B is inclined with respect to the side of the rectangle as indicated by the arrow, and has the same function as the veneer 1 of this example.

Returning to FIG. 3, the veneers 1 and 1B manufactured as described above are then subjected to a classification step 104, and in the classification step 104, the chipped portions and cracked portions of the veneers 1 and 1B are repaired. After that, the work such as trimming the edges with an edge gluer is performed. Furthermore, the veneers 1 and 1B are selected according to the application. Then, a mechanism using a plurality of single plates is performed. In this case, the sorting step 104 includes the step 10
Not only veneers 1 and 1B having an oblique fiber direction produced in 3 but also conventional veneers having a fiber direction parallel to the side are supplied. These veneers are classified into a front plate, a core plate, a core plate, and a back plate, and a mechanism is adopted to form one plywood. The plywood 7 of this example is shown in FIG.
As shown in Fig. 2, two core plates 1 having diagonal fiber directions
A, 1B and two centering plates 5A made of conventional single plate,
5B is an intermediate plate, and the intermediate plate is laminated between a front plate 4A and a back plate 4B, which are conventional single plates, and the adjusting step 104 has the configuration of FIG. 1B. 6 pieces of veneer are assembled. The set of veneer thus prepared is then subjected to an adhesive application step 105, and in this adhesive application step 105, a device such as a glue mixer and a spreader is used to bond both sides of the middle plate excluding the front plate and the back plate. The agent is applied. In this case, a thermosetting resin is usually used as the adhesive.

Next, the set of veneer coated with the adhesive is
The crimping process 106 is performed. In the crimping step 106, a set of plywood is usually pre-compressed by a compression device such as a cold press at room temperature and then crimped by a heating compression device such as a hot press. The temperature and pressure in this hot press are set in consideration of the type and application of the adhesive, but normally, the temperature is set to about 110 ° to 135 ° C and the compression pressure is set to about 8 to 12 kgf / cm ^3. To be done. The rough plywood formed in the crimping step 106 is then cut into a rectangle of an appropriate size in the cutting step 107 after the side surfaces are arranged. The cutting direction in this case is
It is cut so that the cutting surface is parallel to the four sides of the rectangle. Then, in the finishing step 108, the rough plywood cut into a predetermined size is surface-polished using a sander or the like to be finished as the plywood 7 of this example.

Next, a second method for manufacturing plywood according to the present invention will be described with reference to FIGS. The basic manufacturing process of plywood is the same as that in FIG. 3, and the same steps as those in FIG. 3 are denoted by the same reference numerals in FIG. 5, and detailed description thereof will be omitted. FIG. 5 is a flow chart for explaining the manufacturing process of this example. In FIG. 5, the drying and cutting process 103A and the cutting process 107A are different from those in FIG. According to the first plywood manufacturing method, in the drying and cutting step 103 of FIG. 3, as shown in FIG. Although the veneer 1 having an oblique fiber direction with respect to is manufactured, in this example, the drying and cutting step 103
In A, as in the prior art, cutting is performed so that the cut surface is perpendicular to the fiber direction, and a veneer having parallel fiber directions is manufactured. Then, up to the pressure bonding step 106, the conventional method is used to manufacture the rough plywood 60 (see FIG. 6). As shown in FIG. 7, the rough laminated plate 60 is a combination of single plates having parallel fiber directions so that the fiber directions intersect each other. Although this rough plywood 60 is cut in the next cutting step 107A, in this example, the rough plywood 60 is cut by a method different from the conventional method.

FIG. 6A shows an example of a method for cutting the rough plywood 60 close to a square, and as shown in FIG. 6A, the adjacent midpoints E and F of the four sides of the rough plywood 60 are adjacent to each other. , Midpoint F,
Cutting is performed along a straight line connecting G, the midpoints G and H, and the midpoints H and E. The fiber direction of the plywood 7D thus cut has an inclination angle of about 45 ° with respect to the side. in this case,
Similar to the first manufacturing method, the plywood 7D is cut out from the rough plywood 60, whereby the four half-end portions 61A to 61D are cut off.
Is manufactured. Therefore, these four half-ends 61A
Another plywood is manufactured using ~ 61D.

FIG. 6B shows an example in which plywood is manufactured by using the half-end portions 61A to 61D manufactured by the method shown in FIG. 6A. As shown in FIG. 6B, The rectangular plywood 7E is manufactured by adhering the four half-end portions 61A to 61D with a suitable adhesive material. In this case, the fiber directions of the half end portions 61A to 61D are parallel to the sides of the rectangle, as indicated by the arrows in the figure. That is, the plywood 7E manufactured by this method has the same function as the conventional plywood. The plywoods 7D and 7E cut in the predetermined direction in the cutting step 107A as described above are then polished in the finishing step 108 to be finished as a plywood product.

This second manufacturing method has a cutting step 107A.
Since it is only necessary to change the cutting method in, it can be manufactured immediately in the current plywood factory. In addition, for example, when the size of the plywood 7D manufactured by the second manufacturing method is small, a plurality of plywood such as the plywood 7D may be combined to manufacture a plywood of a desired size.
Further, in this example, the cutting direction is set such that the fiber direction is 45 with respect to the side.
Although the angle is set to be 0 °, this angle is not limited and the angle in the fiber direction may be adjusted according to the purpose.

The present invention is not limited to the above-described embodiments, and it goes without saying that various configurations can be adopted without departing from the gist of the present invention.

[0037]

According to the first plywood of the present invention, the external shape of
At least one veneer having a fiber direction oblique to one side is included. Since the veneer has a strong rigidity against a load in the fiber direction, the plywood of the present invention has an advantage of having a high rigidity against a load from one diagonal side with respect to one side of the outer shape. Therefore, for example, when used for an outer wall for construction, since it has high rigidity against a load in an oblique direction, not only can there be room in the strength of studs and braces used as a reinforcing material for the outer wall, It can be expected to eliminate those reinforcing materials. In particular, when the brace or the like can be omitted, not only the brace plate can be omitted, but also the structure and arrangement of the hole-down hardware for fixing the column can be facilitated.

Further, when a plurality of veneers include two veneers having oblique fiber directions, and when laminating the two veneers so that the fiber directions are different from each other, both veneers intersecting each other may be intersected. A plywood having a high rigidity with respect to a load from an oblique direction can be obtained. Further, at least one veneer having an oblique fiber direction includes a core plate which is a central member of the plywood, and whether the core plate is substantially orthogonal to one side of the outer shape above and below the core plate. Or, when veneers having parallel fiber directions are laminated, the plywood has high rigidity against load in the diagonal direction and also against load from parallel or orthogonal direction to one side of the outer shape. There is.

Also, at least one veneer having an oblique fiber direction is 20 ° with respect to one side of the outer shape.
When the fiber directions intersect at an inclination angle of ˜70 °, a plywood having high rigidity with respect to an oblique load is obtained. When the range of this inclination angle exceeds the range of 20 ° to 70 °, sufficient rigidity cannot be obtained against a load from an oblique direction.

According to the second plywood of the present invention,
Since the fiber directions of the two veneers intersect, the same effect as that of the first plywood according to the present invention can be obtained, and a plywood having high rigidity against loads from both diagonal directions intersecting can be obtained. There is an advantage. Further, according to the plywood panel of the present invention, since the first or second plywood of the present invention and the heat insulating material are integrated, a plywood panel having high rigidity against a diagonal load can be obtained, and the site There is an advantage that the workability in construction is significantly improved and the construction cost is reduced.

Further, according to the first plywood manufacturing method of the present invention, in the second step, the roll-shaped veneer is cut in a direction obliquely inclined with respect to the longitudinal direction. Veneers with oblique fiber directions are obtained. Therefore, the veneer can be used to manufacture the first or second plywood of the present invention. Further, according to the second plywood manufacturing method of the present invention, the plywood manufactured in the fifth step is a stack of a plurality of veneers having fiber directions oblique to the longitudinal direction. The first and second plywood can be manufactured.

[Brief description of drawings]

FIG. 1A is a perspective view showing a single plate constituting an example of an embodiment of a plywood according to the present invention, and FIG. 1B is a development view showing an example of a plywood according to the present invention.

FIG. 2A is a plan view showing an example of an embodiment of a plywood panel according to the present invention in section, FIG. 2B is a front view in which the plywood panel of FIG. 2A is used for a wall surface of a house, and FIG. ) Is Figure 2
It is sectional drawing which follows the AA line of (b).

FIG. 3 is a process drawing showing the first method for manufacturing plywood according to the present invention.

FIG. 4 is a plan view for explaining a cutting method in a drying and cutting step 103 of FIG.

FIG. 5 is a process drawing showing the second method for manufacturing plywood according to the present invention.

6 is a plan view for explaining a cutting method in a cutting step 107A of FIG.

FIG. 7 is a development view showing a configuration of a conventional plywood.

FIG. 8 is a partially cutaway perspective view showing an example of a conventional wall structure of a house.

[Explanation of symbols]

 1 Veneer 1A, 1B Core plate 2, 2A, 2B, 6A to 6D Fiber reinforcement 4A Front plate 4B Back plate 5A, 5B Binder plate 7, 7A to 7D Plywood 8 Plywood panel 9 Heat insulation material 10 Support plate 11 Support frame 53 Roll-shaped veneer 54 Cutter 60 Rough plywood

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Masanori Izawa 1-32-1, Sugadaida Tsutsumi, Tama-ku, Kawasaki City, Kanagawa Prefecture (72) Inventor Seiichi Hirano 2-22-6, Sugesenya, Tama-ku, Kawasaki City, Kanagawa Prefecture Issue (72) Inventor Kazuhiko Sasamoto 5-15-14 Honcho, Shibuya-ku, Tokyo Estacion Shibuya 111

Claims (8)

[Claims] 1. A plywood comprising a plurality of laminated veneers, wherein at least one of the plurality of veneers has an oblique fiber direction with respect to one side of the outer shape. . 2. The plywood according to claim 1, wherein the plurality of veneers include two veneers having oblique fiber directions, and the two veneers have different fiber directions from each other. A plywood characterized by being laminated on. 3. The plywood according to claim 1 or 2, wherein at least one veneer having the oblique fiber direction,
A core plate serving as a central member of the plywood is included, and a single plate having a fiber direction substantially orthogonal to or parallel to one side of the outer shape is laminated on each of the upper and lower sides of the core plate. Characteristic plywood. 4. The plywood according to claim 1, 2, or 3, wherein the at least one veneer having the oblique fiber direction comprises:
A plywood having fiber directions that intersect each other with one side of the outer shape at an inclination angle of 20 ° to 70 °. 5. A plywood comprising a plurality of laminated veneers, wherein the fiber directions of two veneers of the plurality of veneers intersect obliquely. 6. A plywood according to claim 1, 2, 3, 4, or 5, a heat insulating material, and a support plate, wherein the heat insulating material is scissored between the plywood and the support plate. Plywood panel characterized by being integrated. 7. A first step for producing a roll-shaped veneer in which the fiber direction is substantially parallel to or orthogonal to the longitudinal direction, and the roll-shaped veneer produced in the first step. After drying the veneer,
A second step of cutting the dried roll-shaped veneer to form a plurality of veneers, and a third step of adjusting the plurality of veneers cut in the second step according to the purpose, A fourth step of manufacturing a rough plywood by laminating and pressure bonding a plurality of veneers prepared in the third step with a predetermined adhesive material, and a rough plywood manufactured in the fourth step in a predetermined manner. A fifth step of cutting to size, in the second step, at least one of the plurality of veneers is the roll-shaped veneer with respect to the longitudinal direction of the roll-shaped veneer. A method for manufacturing plywood, which is formed by cutting in an obliquely inclined direction. 8. A first step of manufacturing a roll-shaped veneer by cutting raw wood and winding it in a predetermined direction, and after drying the roll-shaped veneer manufactured in the first step,
A second step of cutting the dried roll-shaped veneer to form a plurality of veneers, and a third step of adjusting the plurality of veneers cut in the second step according to the purpose, A fourth step of manufacturing a rough plywood by laminating and pressure bonding a plurality of veneers prepared in the third step with a predetermined adhesive material, and a rough plywood manufactured in the fourth step in a predetermined manner. A fifth step of cutting to size, and in the fifth step, the rough plywood is cut in a direction obliquely inclined with respect to the longitudinal direction of the rough plywood.