JP2011245842A - Method for manufacturing joint board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a joint board at low cost that prevents warping, twisting, bending, etc., whose outer diameter is not restricted by a length of a scrap to be used, and which has a high design effect and an arbitrary size.SOLUTION: A method for manufacturing a joint board having an arbitrary size and area without restriction by the length of a log 1 includes: scrap joint processes (S3, S4) to cut out strip scraps 2 from the log 2 (S1, S2) and arrange and bond one end of each scrap in a plane while sequentially shifting each one end in the direction of the other end while the side faces area adjacent to each other; a log cutout process (S5) to cut out a collection plate and cut out strip logs; a log joint process (S6) to bond the strip logs each other while reversing them alternately and manufacture a collection plate on which straight grain or cross grain patterns obliquely cross each other sequentially alternately on the surface; and a cutting and machining process (S8) to cut out the plate with desired dimensions.

Description

  The present invention relates to a method for manufacturing a practical and highly effective bonded plate by bonding a plurality of pieces of wood having a grid or a plate on the surface.

  Conventionally, so-called joint plates (joint plates), in which, for example, the timber material formed on the surface of wood pieces such as cedar, cocoons, sawara, etc. are alternately joined to the timber material of adjacent wood pieces at a constant angle. The natural texture of the wood itself is favored by the Japanese, and the alternately slanted grid pattern that appears on the surface of the joint plate, combined with the reddish and white grounds of the wood, provides an excellent design effect. To do.

Therefore, the usage is wide-ranging, such as furniture, interior decoration materials, box items such as library boxes and jewelry boxes, and table top products such as trays and place mats.
Conventionally, many methods for manufacturing the bonding plate have been proposed (for example, Patent Document 1, Patent Document 2, and Patent Document 3).

  However, recently, as is well known, it is demanded to produce a product that is easy on the global environment, and the joining plate is particularly necessary because it uses forest trees that absorb carbon dioxide.

  Therefore, it is required to produce a practical and high design effect joining plate at low cost without cutting down many standing trees.

  In addition, the joining plate is made of a combination of multiple pieces of wood and joined together by an adhesive, so warpage, twisting, bending, etc. are likely to occur due to secular changes after manufacturing, and cracking, tearing, etc. will occur when a greater external force is applied. There is a problem that it is easy to do.

  Therefore, it is necessary to manufacture a bonded plate having a high design effect at a low cost, while maintaining a certain practical strength that can withstand use even after manufacturing, and warping due to secular change. It is required to have a quality that does not cause twisting, bending, cracking or tearing.

  From the viewpoints of strength and quality, the conventional joining plate mainly uses “grid material” as a raw material, and “plate material” generated in a large amount in comparison with the mesh material has a predetermined strength. Due to the problem of quality anxiety such as warping, it has hardly been used as a raw material for bonding plates.

  However, in order to secure the wood grain, high quality wood with the same grain is required as the raw wood, so new forest cutting is required. For example, thinned wood, scrap after removal of structural materials, recycling If we can use the “wood grain material” generated from timber, etc., especially “wood grain material” as the raw wood of the joint board, we will preserve the earth's resources without requiring new forest cutting.

JP-A-7-32307 Japanese Patent Laid-Open No. 7-137008 JP-A-10-230501

  Therefore, the present invention has been made in view of the above-mentioned problems of the prior art, and the warp material is easy to be used for the global environment as the raw wood to be used, in particular, the “end material” made of plate material is warped. It is difficult to cause twisting, bending, etc., and the maximum outer dimensions that can be manufactured are of any size that is not limited by the length of the end material to be used, and a highly effective joint plate having a certain practical strength. It aims at providing the manufacturing method of the joining board which can be manufactured at cost.

In order to achieve the above object, a method for manufacturing a bonded plate according to the present invention is a method for manufacturing a bonded plate formed by adhering the side surfaces of strip-shaped raw materials having a grid pattern whose fiber direction is inclined on the surface. ,
By cutting out a plurality of strip-shaped end materials from the raw wood, adjoining the side surfaces, arranging one end portion of each end material in a planar manner while sequentially shifting in the other end portion direction of the end material, An end material joining step for manufacturing a single laminated plate, a strip-shaped raw material cutting step for cutting a plurality of strip-shaped raw materials by cutting the laminated plate at a constant angle and a constant width, A plurality of strip-shaped raw materials cut out are arranged in a plane while being aligned parallel to each other in the width direction, and adjacent strip-shaped raw materials are alternately reversed and bonded to each other so that the checkerboard pattern is alternately alternately formed on the surface. It consists of a strip-shaped raw material joining step for producing a single laminated plate, and a cutting / working step for cutting the laminated plate obtained in the step into a desired size or shape, and in the end material joining step, The number of strip-shaped end materials adjacent to each other and arranged in a plane, In the strip-shaped raw material joining step, it is possible to manufacture a joining plate of any size or area that is not limited by the length of the raw wood by adjusting the number of the strip-shaped raw materials that are alternately reversed and arranged in a plane. (Hereinafter, referred to as “first method invention” in some cases).

  In this case, the raw wood may be thinned wood, end material after removal of structural material, or recycled material (hereinafter, in the present invention, these raw materials are collectively referred to as “end material”).

  In addition, in the raw material cutting step, the angle at which the strip-shaped raw material is cut out from the laminated plate depends on the application, but it is set within a range of 25 ° to 60 ° with respect to the grid pattern forming the laminated plate. preferable.

  In addition, the method for manufacturing a bonded plate according to the present invention is a method for manufacturing a bonded plate in which the side surfaces of strip-shaped raw materials having a grain pattern whose fiber direction is inclined on the surface are bonded to each other. By cutting out the strip-shaped end material of the book and arranging the one end of each end material in a plane while sequentially shifting in the direction of the other end of the end material while adjoining the side surfaces, An end material joining step for producing a laminated plate, a strip-shaped raw material cutting step for cutting a plurality of strip-shaped raw materials by cutting the laminated plate at a constant angle and a constant width, and a plurality of cut pieces cut in the step The strip-shaped raw materials of the books are arranged in a plane while being aligned parallel to each other in the width direction, and the adjacent strip-shaped raw materials are alternately reversed and bonded to each other, so that the grain pattern is alternately obliquely crossed on the surface. Strip-shaped raw material joining process for manufacturing a single laminated board, and the process The cutting and processing step of cutting the obtained laminated plate into a desired size or shape, the number of the strip-shaped end materials arranged adjacent to each other in the end material joining step, and the strip-shaped raw material joining step By adjusting the number of the strip-shaped raw materials that are alternately reversed and arranged in a plane, it is possible to manufacture a joining plate having an arbitrary size or area that is not limited by the length of the raw wood. (Hereafter, it may be referred to as “second method invention”.)

  In the case of the second method invention, unlike the above-mentioned first method invention using a mesh material as a raw material, on the relationship of using a plate material, in the drying step, the bonding plate after the cutting and processing step is at room temperature to It is preferable to dry within a relatively low temperature range of 65 ° C. and within 168 hours (7 days). This is because the temperature exceeding 65 ° C. and rapid drying cause breakage between the fibers of the joining plate and discoloration of the surface, which causes problems in terms of quality and durability. On the other hand, when the drying temperature is lower than room temperature or the drying time is longer than 168 hours, the productivity is inferior and the cost is not economical. A well-known thing can be used for a low-temperature dryer.

  In addition, it is preferable to use the thin wood, the end material after removing the structural material, and the recycled material as the raw wood, as in the first method invention.

  According to the manufacturing method of the joining plate which concerns on Claim 1 and Claim 4, let alone the conventional joining plate with a high design effect be obtained, and also let strip-shaped end material adjoin in an end material joining process. By adjusting the number of pieces arranged in a plane and the number of pieces arranged in a plane by alternately inverting the strip-shaped raw materials in the raw material joining step, an arbitrary size and an arbitrary area not restricted by the length of the raw wood can be obtained. The joining board which has can be manufactured.

  Therefore, even if the raw wood to be used is an end material of a square or a plate, the joint plate having a high design effect having an arbitrary size or an arbitrary area in which the outer dimension of the finished product is not limited by the length of the end material Can be manufactured at low cost.

  According to the manufacturing method of the joining board which concerns on Claim 2 and Claim 6, since the raw wood uses the thinning material, the residual end material after structural material removal, and the mesh or the board material obtained from the recycled material, it secures the raw wood Therefore, it is not necessary to cut down new forest resources.

  Therefore, the manufacturing method of the joining board of this invention is a manufacturing method of the joining board which is kind to a global environment.

  According to the manufacturing method of the joining board which concerns on Claim 3, since the angle which cuts out the joining original board with respect to the longitudinal direction of a end material is made into the range of 25 degrees-60 degrees in the cutting-out process of the raw material for joining, In addition to a high effect, it is possible to obtain a high-strength bonded plate with less cracking, warping, twisting, and the like from the bonded portion.

  According to the method for manufacturing a bonded plate according to claim 5, the method for manufacturing the bonded plate according to claim 4 is further provided with a drying step, and the bonded plate after the cutting and processing step is relatively low at room temperature to 65 ° C. Since it dries within a temperature range and within 168 hours (7 days), a bonded plate having a high strength with less cracking, warping, twisting, etc. from the bonded portion can be obtained.

  Hereinafter, one embodiment of a manufacturing method of a joined board concerning the present invention is described based on a drawing.

  In the following description, the case of the first method invention using a grid material as a raw material will be described with a focus on the entire process diagram of FIG. 1, and the second method invention using a plate material as a raw material will be described. About the case, since the basic process of a manufacturing method is the same as that of 1st method invention, only a different process part will be demonstrated each time. The term “present invention” refers to both the first and second method inventions unless otherwise specified.

  FIG. 1 is an overall process diagram of a method for manufacturing a joining plate according to the present invention, and FIGS. 2 to 5 are detailed views for explaining main processes in the overall process of FIG.

<Raw wood preparation step S1> (see FIG. 2A)
First, as a first step, as shown in the perspective view of FIG. 2A, a log 1 having a predetermined length L, which is a raw material of the joining plate of the first method invention, is prepared (S1).

  The “raw wood” referred to in the production method of the present invention may of course be a standing tree cut as shown in the figure, but mainly thinned wood, remaining scraps after removal of structural materials, recycled materials (all not shown), etc. The “end material” is used.

  These “end materials” should be referred to as “secondary materials” and “tertiary materials” generated in the manufacturing process of various woodwork products as compared with the raw wood 1.

  As described above, since the raw material that is the material of the joining plate used in the present invention is an end material, its material and length are not constant, and it is difficult to use as the material of the joining plate. In order to enhance the design effect, a wood grain material is cut out from the raw wood 1 in particular. That is, as shown in FIG. 2 (a), in order to cut off the end pieces 2a, 2b,. On the other hand, in the case of the second method invention, a ruled line I is put at a position where the plate material can be taken.

  Although there is no restriction | limiting in particular as the kind of the log 1 of edge material, The thing which can take many grid materials, such as a cedar, a cocoon, and a sawara is preferable.

  As described above, in the manufacturing method of the present invention, since the endwood is used as the raw wood 1, the “predetermined length L” is not particularly limited and may be a short one. In the embodiment, for the sake of convenience in the following description, a piece cut into a “constant length L” as shown in the figure is used.

<Strip-shaped end material cutting step S2> (see FIG. 2B)
Next, as shown in the perspective view of FIG. 2 (b), a plurality of end members 2a, 2b,... Book) cut out (S2).
On the surface of each strip-shaped end material 2a, 2b,... 2e, a plurality of checkered patterns 3, 3,... 3 corresponding to the ruled positions of the log 1 in FIG.
On the other hand, although illustration is omitted, a plurality of fiber patterns appear when the end material of the plate material is used.

<End material joining step S3> (see FIG. 3)
Next, the plurality of strip-shaped end pieces 2a, 2b,... 2e shown in FIG. 2B are maintained without changing their mutual positions, that is, the cut-out positional relationship shown in FIG. As it is, it is arranged in a plane on a work table or the like (not shown).

  As for the arrangement, the right end of the next strip-shaped end material 2b is sequentially arranged from the strip-shaped end material 2a positioned at the uppermost stage so that it is shifted leftward by the displacement length e, so that the lowermost end material 2e is They are arranged in a staircase shape so as to be located at the lower left (S3).

  In this case, how much the shift length e to the left is to be determined substantially determines the inclination angle β (see FIG. 5B) of the completed joint plate 10C with respect to the checkerboard pattern 3, and thereby the joint plate 10C. Since it affects the design effect produced by the surface design, it is arranged in advance after designing.

  It should be noted that whether the shifting direction is leftward or rightward depends on where the operator's dominant hand is, and is not limited to the leftward direction.

  In addition, the number of the end pieces to be arranged up to the bottom end end piece 2n will be described in the later-described cutting / processing step (S8), but the final dimension of the joining plate 10C to be manufactured (see FIG. 5B). Since this affects the horizontal dimension (W2 dimension in the figure), it is also designed in advance.

<End material bonding step S4> (see FIG. 4A)
Next, an adhesive (not shown) is applied to each side surface of each end material 2a, 2b,... 2e, and bonded while being clamped to produce a single assembled plate 10A (S4).

  As an adhesive, for example, a resorcinol type, a urea type, etc. can be used besides a vinyl acetate type adhesive often used as an adhesive for wood.

  As a method of pressing after bonding, for example, high-frequency plate bonding is used to obtain a laminated plate 10A in which the side surfaces of the end materials 2a, 2b,.

<Strip-shaped raw material cutting step S5> (see FIG. 4B)
Next, as shown in the plan view of FIG. 4B, the position indicated by the two-dot chain line in the figure, that is, the width of the uppermost portion (end material) with respect to the assembled plate 10A of FIG. A plurality of strip-shaped raw materials 5 are obtained by cutting so that the width in the longitudinal direction of 2a is W and the inclination angle with respect to the grid pattern 3 is β (S5).

  In this step, another strip-shaped raw material 5 is newly cut out from the assembled plate 10A obtained by arranging the above-mentioned “strip-shaped end materials 2a, 2b... 2e”. 5 is abbreviated as “strip-shaped raw material 5”.

  This inclination angle β is preferably in the range of 25 to 60 ° with respect to the wood grain pattern 3 in the figure. The reason is that if it is less than 25 °, the waste of raw materials increases, and if it exceeds 60 °, it is This is because the adhesion strength is weakened.

  Considering such a viewpoint, the inclination angle β is preferably in the range of 25 to 60 °, and more preferably in the range of 30 to 45 °.

  Moreover, since the cutting width W is related to the design and strength of the joint plate to be finally produced, it is appropriately determined in consideration of these. The cutting width W is preferably set in the range of 25 to 40 mm, although it depends on the use of the joining plate to be manufactured.

  Thereafter, a plurality of strip-shaped raw materials 5 are cut out in the same manner from a single laminated plate 10A. How many strip-shaped raw materials 5 are cut out is the completion of the joining plate 10C shown in FIG. Since it affects the vertical dimension W1 among the dimensions, it is designed in advance.

<Raw material joining step S6> (see FIG. 5A)
Next, the plurality of strip-shaped raw materials 5 obtained in the previous process are arranged in close contact with each other by alternately changing (reversing) the front and back without changing the arrangement order of each other (S6).

  This state is shown in the plan view of FIG. 5A, the height is W1, the length is L1 (L1> h), and the outer shape on both sides in the length direction is the strip-shaped raw material 5 Since the front and back are alternately arranged, the zigzag shape is formed as shown in the figure.

  In this figure, the grid pattern 3 is emphasized by describing more lines than in the previous step for the sake of explanation (the same applies to FIG. 5B described later).

<Raw material adhesion step S7> (see FIG. 5A)
Next, by using the above-described adhesive and a pressing machine, a single laminated plate 10B having a longitudinal W1 of 420 mm and a width L1 of 240 mm is obtained (S7).

  Since the strip-shaped raw material 5 is arranged in close contact with the front and back alternately in the previous step, the surface pattern of the obtained laminated plate 10B is a checkered pattern 3 of each adjacent strip-shaped raw material 5 Is a so-called arrow feather pattern having a crossing angle β of 25 to 60 °.

  Here, the joint plate of the finished product obtained through the post-process is remarkably improved by setting the crossing angle β to an appropriate value for warpage, bending, cracking, etc. due to long-term use, secular change, etc. (Refer to the detailed embodiment 1).

<Cutting and processing step S8> (see FIG. 5B)
Finally, as shown in the plan view of FIG. 5 (b), by cutting both ears of the assembled board 10B obtained in the previous step with an appropriate tool, the vertical dimension is W1 and the width dimension is W2. A rectangular joining plate 10C as an object of the invention is obtained (S8).

  In other words, the cut rectangular joint plate 10C obtained by the manufacturing method of the invention has a vertical outer dimension W1 that depends on how many strip-shaped raw materials 5 in FIG. The lateral dimension W2 in the lateral direction depends on how many end pieces 2a, 2b... 2n are arranged in the end piece joining step S3.

  In addition, although illustration is omitted, after processing the outer shape to a desired shape as appropriate, through surface polishing, transparent varnish, lacquer, lacquer coating, etc., improve design and decoration, and further improve durability For this purpose, various post-processes are performed to obtain a target joining plate. FIG. 6 is a perspective view of a tray 10D manufactured as an example of a final product from the rectangular joint plate 10C.

  As mentioned above, the manufacturing method of the joining board which concerns on this invention has the design effect which was excellent in the designability and decorativeness, such as the arrow feather pattern which the obtained joining board 10C has obtained from the conventional joining board. The following excellent actions and effects can be achieved.

1. The strip-shaped end materials 2a, 2b,... 2e in FIG. 1 (b), which are the raw materials of the joining plate, do not require the cutting of new forest resources such as the raw wood 1 such as standing trees. Since what was obtained from the material etc. is used, a joining material can be manufactured at a very low cost.
In addition, the manufacturing method of the present invention is a manufacturing method that is very friendly to the global environment because forest resources on the earth can be used without waste by using the above-mentioned offcuts.

  2. Of the longitudinal dimension W1 and the width dimension W2 which are the outer dimensions of the joining plate 10C of FIG. 5B obtained by the manufacturing method of the present invention, the longitudinal dimension W1 is in a direction perpendicular to the longitudinal direction of the strip-shaped end material 2. The desired length can be set by increasing the number of arrays. In other words, the length of the raw material such as the raw material 1 is not limited, and a joining plate having a large arbitrary length can be manufactured from a short end material.

Further, the outer dimension W2 in the width direction of the joining plate can be easily expanded to an arbitrary dimension by increasing the number of the strip-shaped raw materials 5 obtained in the raw material cutting process in the width direction. Further, the strip-shaped raw material 5 can be cut out as many as necessary from the assembled plate 10A of FIG. 4A obtained by arranging the end materials 2a, 2b,... 2e in the longitudinal direction. Similarly, the length of the end materials 2a, 2b... 2e is not limited.
Therefore, the manufacturing method of the joining board which concerns on this invention can manufacture easily the joining board whose external shape is a desired dimension and an area without being influenced by the material and length of the raw wood 1 at low cost.

  3. In the raw material joining step (S6) in the production process of the present invention, since the inclination angle β with respect to the checkered pattern 3 is set in the range of 25 to 60 °, it is possible to produce a joining plate with significantly improved strength. it can.

  The embodiment of the method for manufacturing the joining plate according to the present invention is as described above, but this embodiment is only an example, and the present invention is of course not limited to the manufacturing method of the embodiment.

  Therefore, the present invention can be variously modified and combined within the scope of the claims, and these modified and combined examples are also included in the scope of the present invention.

Embodiment 1

  This Embodiment 1 is a case of the first method invention using a grid material as the strip-shaped end materials 2a, 2b...

[Manufacture of bonded plates]
First, as a log preparation step (S1) in FIG. 2A, a log 1 made of cedar and having a length L of 400 mm was prepared.

  Next, as the strip-shaped end material cutting step (S2) in FIG. 2B, 10 strips are cut out as the strip-shaped end materials 2a, 2b,... 2n, the width ω is 35 mm, the thickness t is 12 mm, and the length is long. The length L was 395 mm.

  Next, as the end material joining step (S3) in FIG. 3, the inclination angle α is 45 ° with respect to the grid C of each end material, and the line connecting the right shoulders of each end material 2a, 2b,. Five end materials 2a, 2b,... 2e were arranged with being shifted little by little so as to be within the range.

  Next, as an end material bonding step (S4) in FIG. 4 (a), a PI bond (manufactured by Oshika Co., Ltd., model EP11) is used as the wood adhesive, and a high frequency plate bonding machine is used as a pressing method after bonding. The assembled plate 10A in which the side surfaces of the end materials 2a, 2b,. The vertical dimension h of the laminated plate 10A was set to a width (W) of 35 mm × 10 pieces = 350 mm by joining five pieces of the end materials 2a, 2b,.

  In the strip-shaped raw material cutting step (S5) in FIG. 4B, the width W of the strip-shaped raw material 5 is 35 mm, the length L1 is 440 mm, and the inclination angle β is 45 °.

  Then, in the raw material joining step (S6) of FIG. 5 (a), a plurality of strip-shaped raw materials 5 are arranged in a zigzag shape as shown in the figure, and the raw material bonding step (S7) of FIG. 5 (a). Then, by using the above-mentioned adhesive and a clamping machine, a single laminated plate 10B having a vertical W1 of 440 mm and a width L1 of 240 mm as outer dimensions was obtained.

  Finally, as the cutting / processing step (S8) of FIG. 5B, a rectangular joint plate 10C of the present invention having the same vertical dimension W1 of 440 mm and the width dimension W2 of 240 mm was obtained.

[Strength test]
Six types of test pieces shown in FIG. 7A to FIG. 7F were cut out from the rectangular joint plate 10C as test pieces used for the strength test.
Among these, the samples shown in FIGS. 7A to 7C are for the bending strength test, and the samples shown in FIGS. 7D to 7F are for the warpage and twist degree test. It is.

  Of these, the samples of FIGS. 7 (a) and 7 (d) are conventional comparative examples in which the fiber inclination angle β is 0 °, and the samples of FIGS. 7 (b) and 7 (e) are fiber inclination angles. The samples of FIG. 7 (c) and FIG. 7 (f) are of the embodiment of the present invention in which β is 30 ° and the fiber inclination angle β is 45 °.

  The reason for considering strength against bending, warping, and twisting as strength test items is that local conifers have many small-sized trees in artificial forests, and when they are made into products, they tend to bend, warp, and twist, and have high added value. This is because it was difficult to make, so we wanted to be able to eliminate the shortcomings.

  Therefore, the test items and test conditions of the strength test are summarized as follows.

<Test items>
1. Bending strength test: Three types of fiber inclination angle β
(Β = 0 °, 30 °, 45 °)
2. Environmental test: Degree of distortion (warp, twist)

<Test conditions for sample samples>
40 ° C., humidity (RH) 30%, 24 hours ⇒ 40 ° C., humidity (RH) 90%, 24 hours is one cycle, and this is repeated 2 cycles (that is, the test time is 48 hours).

  When each humidity is changed, the degree of warpage is measured with a laser distortion measuring device (manufacturer: Mechatronics Inc.).

<Number of measurements>
Each test specimen is tested three times each, including initial value measurements.

・ Fatigue resistance test with constant temperature and humidity machine 160 ℃ / 8h × 48 hours ・ Displacement measurement with laser distortion measurement device Expected result (comparison with A)

<Test results>
1. The test piece A is strong in the longitudinal direction, but tends to warp or weak in the shorter direction. Contrary to this, the test piece B (inclination angle: 45 °) is weak in the longitudinal direction but hard to warp in the short direction. The test piece C (shaft angle: 30 °) is stronger in the longitudinal direction than the test piece B.

  2. As for the inclination angle β, if the inclination angle β is 45 ° or more, it is weak in the longitudinal direction, and if it is 30 ° or less, the raw materials are likely to be wasted.

  As described above, the joint plate obtained by the first method invention is warped, twisted, bent even though an “end material” made of a grid material (or plate material) that is easy for the global environment is used as a raw wood to be used. In addition, it is possible to produce a bonded plate with a high design effect that has a certain practical strength and an arbitrary size that is not restricted by the length of the end material used, and that can be manufactured at a low cost. Has an effect.

Embodiment 2

  The second embodiment is an example in which a cedar plate material is used as the end material, and a joining plate is manufactured by the second method invention.

  In the second embodiment, in order to determine whether or not a joining plate using a plate material as the end material 2a... Can actually be put to practical use, the above-described second material 2a. A comparative test was performed between the joint plate manufactured according to the method invention and the joint plate manufactured according to the second method invention using the end material 2a of the grain material of the present embodiment.

The comparative test items are the same “bending strength test” as in the first embodiment and the “environment test” in which warpage and torsion are regarded as displacement and evaluated.
[Bending strength test]
First, the bending strength test will be described with reference to FIGS. 9 and 10.

<Raw wood preparation process>
In the second method invention, in particular, the strip-shaped end material 2a cut out from the raw wood 1 ... the previous raw material (the raw material between steps S1 and S2 in FIG. 1) at a drying temperature of 65 ° C. and a drying time of 168 Low temperature drying for hours.

<Production of test joining plate>
A cedar wood material was used as the end material, and this was used in the first method invention, and the plate material was produced in the second method invention, so as to produce a joining plate having an appropriate external dimension.

FIG. 8 is a plan view of the joining plate obtained by the first and second method inventions, and the following three types are used depending on the fiber direction of the raw material.
(A) Ordinary joining (b) 45 ° inclined pit joint (c) 30 ° inclined pit joint

<Cutting out test piece>
From the two types of joining plates, five test pieces for the bending strength test in the fiber direction (dimensions: length 400 mm × width 60 mm × thickness 10 mm), and the width direction (direction perpendicular to the fiber direction) ) Five sheets (dimensions: length 300 mm × width 60 mm × thickness 10 mm) were cut out.

  Therefore, the number of test pieces subjected to the strength test is 3 types in the fiber direction (usually 45 °, 30 °) × 5 individual test pieces × 2 types in the cutting direction of the test piece (fiber direction, width direction) × There are two types of raw materials (grid material, plate material) = 60 (see FIG. 10). Here, the “normal” fiber direction means that the inclination angle (same as the inclined shaft angle) in the first embodiment is 0 °.

<Test method>
FIG. 9 shows an outline of the strength test of the bonded plates obtained by the first and second method inventions. Of these, FIG. 9A is a schematic diagram of the strength test method, and FIG. In this equation, the bending strength (N / mm ² ) is obtained from the breaking load P obtained by this strength test. In FIG. 9B, “P”, “b”, and “h” mean “length 400 mm and 300 mm”, “width 60 mm”, and “thickness 10 mm” of the above-described test piece. , “I” is the secondary moment of inertia (N / mm ⁴ ).

  FIG. 10 is a table summarizing the bending strength test results of the 60 test pieces, and the tilt direction (see (a) to (c)) and the joining direction ((1), (2) in the test piece. / (3), see (4)) and the influence on the bending strength due to the difference in the raw materials used (grid material, plate material).

<Bending test results>
What can be said from the bending strength test results is as follows.
1. When the “joining direction” is the fiber direction (see Tables (1) and (2))
The effect of the size of the “tilt shaft direction” is that for both squares and plate materials, “normal” has the highest bending strength and becomes weaker in the order of 30 ° → 45 °. The bending strength is reduced to about 32% (20.4 / 62.8), and to about 19% (13.4 / 70.1) for the plate material. However, any of these can be put to practical use.

It should be noted here that when the inclined shaft is “normal”, there is a region where the plate material has a higher bending strength (70.1> 62.8) than the grid material (Table (2) (a )), And the average bending strength of 13.4 (N / mm ² ) in the case of “45 ° inclined shaft” (see Table (2) (b)) with the lowest bending strength of the plate material is referred to as “45” When it is divided by the average bending strength of 20.4 (N / mm ² ) in the case of “° -shaft” (see Tables (1) and (b)), it rapidly decreases to 13.4 / 20.4 = 0.66 times. It is.

When this fact was analyzed, it was found that when the tilt angle is in the range of “0 ° to 20 °”, a joint plate having a higher bending strength than that of the cross member can be obtained.
2. When the “joining direction” is the width direction (see Tables (3) and (4))
As shown in these tables, the absolute values of the average bending strength are all 5 (N / mm ² ) or less regardless of whether the direction of the tilt shaft or the raw material is square or plate, and this is not suitable for use. . The reason why the bending strength is thus low is that the test load P is peeled off at the bonding portion between the end materials.

[Environmental testing]
<Preparation of specimen>
This time, 10 strip-shaped end materials 2a... Having a width of 30 mm, a thickness of 10 mm, and a length of 400 mm are joined in the width direction, and the outer dimensions are 400 mm × width 300 mm × thickness 10 mm. The environmental test specimens were manufactured according to the second method invention with respect to two types of raw materials, a grid material and a plate material, and three types of tilt angles of 0 °, 30 °, and 45 °.

  Therefore, the number of test pieces subjected to the strength test is 3 types in the fiber direction (0 °, 45 °, 30 °) × 3 individual test pieces × 3 types of test items (see next section) × 2 types of raw materials (mesh) Material, plate material) = 54 sheets (see FIGS. 13 to 18). The fiber direction of “0 °” means that there is no inclined shaft of the raw fiber, and is the same as “normal” in the above-described strength test.

<Test items>
As environmental test items, each of the above test pieces was allowed to stand in a 40 ° C. and 30% RH atmosphere for 24 hours, and then allowed to stand in a 40 ° C. and 90% RH atmosphere for 24 hours. At each of the A to I points (9 points) at the strain measurement position shown in FIG. 11, the strain state (warp) was measured with a laser strain measurement apparatus (manufacturer: Mechatronics Corporation).

(A) Before environmental test (b) After standing for 24 hours in an atmosphere of 40 ° C. and 90% RH (c) After standing for 24 hours in an atmosphere of 30 ° RH at 40 ° C. FIG. 13 to FIG. 18 show the data classified by region. The nine measurement points on the X and Y axes correspond to the measurement points A to I in FIG.

<Evaluation method of test results>
FIG. 12 is a diagram showing a method for obtaining the “average warp at the center” in FIGS. 13 to 18, in which FIG. 1 Table of environmental test results, FIG. 12 (b) is a diagram showing how to obtain the amount of warping when there is no warp in the Y-axis direction of the test piece, and FIG. 12 (c) is the amount of warping of the test piece in the Y-axis direction. It is a figure of how to obtain.

  That is, in FIG. 12A, when the Y axis = 20 mm point, the measured values at both ends of 0.00 mm and −0.18 mm are shown in the table, and the amount of warpage at the intermediate X axis = 150 mm point is obtained. From b), it is -0.09 mm.

  However, since the actual measurement value at the X-axis = 150 mm point was −0.06 mm, the amount of warpage at the X-axis = 150 mm point was (−0.06 mm) − (− 0.09 mm) = 0.03 mm. is there.

  An example of a calculation result obtained by applying the above operation to all positions is as follows.

No. 0 ° No. 1 Before environmental test Y-axis = 380mm Warpage = 0.06mm
Y-axis = 200mm Warpage amount = 0.03mm
Y-axis = 20mm Warpage = 0.03mm
No. 0 ° No. 2 Before environmental test Y-axis = 380mm Warpage = 0.66mm
Y-axis = 200mm Warpage = 0.78mm
Y-axis = 20mm Warpage = 0.63mm
No. 0 ° No. 3 Before environmental test Y-axis = 380mm Warpage = 0.60mm
Y axis = 200mm Warpage = 0.69mm
Y-axis = 20mm Warpage = 0.59mm
Finally, a simple average value of all the warping amounts is 0.45 mm.

  In this way, the amount of warpage at the X-axis = 150 mm point of all the test pieces was calculated in the same manner as the representative value of each test piece, and the following 0.99 mm (40 ° C. and 30% RH 24 hours later): 54 mm (after 24 hours at 40 ° C. and 90% RH) was obtained.

  Note that the amount of warpage at the Y axis = 200 mm point was not calculated and evaluated in the same manner as described above, because the direction is the portion where the fibers are parallel, and the amount of warpage is at the X axis = 150 mm point. This is because it is sufficient to evaluate the warpage amount at the X-axis = 200 mm point as a representative value of the warpage amount of the test specimen because it is lower than the warpage amount.

  According to the “environmental warpage at the center” in FIGS. 13 to 18, the above environmental test results can be generally described as follows.

1. Effect of “Fiber Shaft Angle (Inclination) Angle of Plate Material” According to the average warpage amount obtained in FIG. 16 and FIG. 17, the average warpage amount is greater for the 30 ° tilt angle than for the 0 ° tilt angle. Few. Further, according to the average warpage amount obtained in FIG. 17 and FIG. 18, the average warpage amount is smaller at the 45 ° slope angle than at the 30 ° slope angle.

  That is, the average warpage amount in these figures is the smallest at 45 ° among the tilt angles of 0 °, 30 °, and 45 °. In particular, those having a grain size of 45 °, although the test environment was changed to 40 ° C. and 90% RH atmosphere and 40 ° C. and 30% RH atmosphere, their average warpage amounts are as shown in FIG. There is no variation between the test pieces of 0.14 mm, 0.15 mm, and 0.15 mm.

2. The warp amount contrast between the “grid material” and the “plate material” The average warp amounts of 0.14 mm, 0.15 mm, and 0.15 mm at 45 ° of the plate in FIG. Compared with .10 mm, 0.12 mm, and 0.08 mm (FIG. 15), the amount of warp is certainly less, but it is not so inferior. Therefore, the joining plate using the end material of “plate material” is suitable for use in applications such as “entrance doors” and “outer walls” that are exposed to the harsh environment by touching outside air for 24 hours. It can be said that.

  Therefore, it has been found that if the drying temperature and the drying time are devised, it is practically not problematic to use the end plate material for the joining plate depending on the use conditions such as application and use environment.

  As described above, the joining plate obtained by the second method invention is used for the purpose and its use, although the “end material” made of the grain material that is easier to the global environment than the grain material is used as the raw wood to be used. Depending on the environment of use, warping, twisting, bending, etc. are not likely to occur, and the maximum outer dimensions that can be manufactured are not limited by the length of the end material used, and the design effect has a certain practical strength. High joint plate can be manufactured at low cost.

It is a whole process figure of the manufacturing method of the joined board concerning the present invention. FIG. 2A is a perspective view for explaining a raw wood preparation process using the grid material and the plate material as raw materials in the overall process diagram of FIG. 1, and FIG. 2B is a strip-shaped end material cutting process of the grid material. FIG. It is a perspective view explaining the end material joining process in the whole process drawing of FIG. 4A is a perspective view for explaining an end material bonding step in the overall process diagram of FIG. 1, and FIG. 4B is a plan view for explaining a strip-shaped raw material cutting step. FIG. 5A is a plan view for explaining the raw material joining step in the overall process diagram of FIG. 1, and FIG. 5B is a plan view for explaining the cutting / working step. It is a perspective view of an example of the final product (basin) concerning the present invention manufactured using the first method invention. It is a top view of the test piece manufactured using the 1st method invention, Drawing 7 (a)-Drawing 7 (c) are for a bending strength test, Drawing 7 (d)-Drawing 7 (f) are For warping and twist test. It is a top view of the test piece for the strength test manufactured using 2nd method invention, FIG.7 (a) is a thing of normal joining, FIG.7 (b) is a thing of 45 degree slanting joint, FIG.7 (c) is what joins a 30 degree inclination shaft. FIG. 9A is a schematic diagram of a strength test of the test piece of FIG. 8, in which FIG. 9A is a schematic diagram of a strength test method, FIG. 9B is a cross-sectional view of the test piece, and FIG. In this equation, the bending strength (N / mm ² ) is obtained from the breaking load P obtained by this strength test. It is the table | surface which put together the test result of bending strength. It is a figure which shows the distortion measurement position on the plane of the test piece for environmental tests. FIG. 12 is a diagram showing a method for obtaining “average warpage in the center” in FIGS. 13 to 18, and FIG. 1 Table of environmental test results, FIG. 12 (b) is a diagram showing how to obtain the amount of warping when there is no warp in the Y-axis direction of the test piece, and FIG. 12 (c) is the amount of warping of the test piece in the Y-axis direction. It is a figure of how to obtain. It is a distortion | strain measurement result table | surface of the test piece of 0 degrees of a tilt shaft obtained by the first method invention, using a grid material as a raw material. It is a distortion | strain measurement result table | surface of the test piece of 30 degrees of inclined shafts obtained by the 1st method invention, using a grid material as a raw material. It is a distortion | strain measurement result table | surface of the 45 degree inclination test piece obtained by the 1st method invention using the mesh material as a raw material. It is a distortion | strain measurement result table | surface of the test piece of 0 degrees of a tilt shaft obtained by the 2nd method invention, using a grain material as a raw material. It is a distortion | strain measurement result table | surface of the test piece of 30 degrees of inclined shafts obtained by the 2nd method invention using the raw material as a raw material. It is a distortion | strain measurement result table | surface of the 45 degree inclination test piece obtained by the 2nd method invention using the raw material as a raw material.

1 Log 1
2 Strip-shaped end materials 2a, 2b,... 2e Strip-shaped end materials 3 Grid pattern 4A, 4B Glue plate 5 Strip-shaped raw materials 10A, 10B, 10C Joint plate 10D Basin (final product)
L Raw wood cutting length W1 Vertical dimension (finished dimension)
W2 horizontal dimension (finished dimension)
α Inclination angle of the strip-shaped end material with respect to the mesh pattern 3 β Inclination angle of the strip-shaped raw material with respect to the mesh pattern 3

Claims (6)

It is a method for manufacturing a joining plate formed by adhering together side surfaces of strip-shaped raw materials having a grid pattern in which the fiber direction is inclined on the surface,
By cutting out a plurality of strip-shaped end materials from the raw wood, adjoining the side surfaces, arranging one end portion of each end material in a planar manner while sequentially shifting in the other end portion direction of the end material, The edge material joining process which manufactures one laminated board,
A strip-shaped raw material cutting step of cutting the laminated plate at a constant angle and a constant width to cut out a plurality of strip-shaped raw materials;
A plurality of strip-shaped raw materials cut out in this step are arranged in a plane while being aligned parallel to each other in the width direction, and adjacent strip-shaped raw materials are alternately reversed and bonded to each other, thereby forming a checkerboard pattern on the surface. A strip-shaped raw material joining process for producing a single laminated board that is alternately and obliquely crossed,
It consists of a cutting and processing step of cutting the assembled plate obtained in the step into a desired size or shape,
The number of the strip-shaped end materials adjacent to each other arranged in a planar shape in the end material joining step and the number of the strip-shaped raw materials arranged alternately in a plane in the strip-shaped raw material joining step are adjusted. By
A method for manufacturing a joining plate, characterized in that it is possible to produce a joining plate having an arbitrary size or area that is not limited by the length of the raw wood.   2. The method for manufacturing a joining plate according to claim 1, wherein the raw wood is a thinned material, an end material after removal of a structural material, or a recycled material.   2. The strip-shaped raw material cutting step, wherein the angle at which the strip-shaped raw material is cut out from the laminated plate is in the range of 25 to 60 degrees with respect to the squares forming the laminated plate. Item 3. A method for producing a bonded plate according to Item 2. It is a method for manufacturing a joining plate formed by adhering the side surfaces of strip-shaped raw materials having a plate pattern whose fiber direction is inclined on the surface,
By cutting out a plurality of strip-shaped end materials from the raw wood, adjoining the side surfaces, arranging one end portion of each end material in a planar manner while sequentially shifting in the other end portion direction of the end material, The edge material joining process which manufactures one laminated board,
A strip-shaped raw material cutting step of cutting the laminated plate at a constant angle and a constant width to cut out a plurality of strip-shaped raw materials;
A plurality of strip-shaped raw materials cut out in the process are arranged in a plane while being aligned in parallel with each other in the width direction, and adjacent strip-shaped raw materials are alternately reversed and bonded to each other, thereby forming a grain pattern on the surface. A strip-shaped raw material joining process for producing a single laminated board that is alternately obliquely crossed,
It consists of a cutting and processing step of cutting the assembled plate obtained in the step into a desired size or shape,
The number of the strip-shaped end materials adjacent to each other arranged in a planar shape in the end material joining step and the number of the strip-shaped raw materials arranged alternately in a plane in the strip-shaped raw material joining step are adjusted. By
A method for manufacturing a joining plate, characterized in that it is possible to produce a joining plate having an arbitrary size or area that is not limited by the length of the raw wood. In the manufacturing method of the joining board of Claim 4,
Furthermore, a drying step is provided, and the joined plate after the cutting / processing step is dried in a low temperature region of room temperature to 65 ° C. within 168 hours.   6. The method for manufacturing a joining plate according to claim 4 or 5, wherein the raw wood is a thinned material, an end material after removal of a structural material, or a recycled material.

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