JP2012171210A - Board and composite board using plant stem, and method for producing the same - Google Patents

Abstract

[PROBLEMS] To easily and strongly bond plant stalks together, thereby eliminating the need for a special heat press apparatus that increases the manufacturing equipment size and equipment cost, and bonds the core parts at room temperature without heating. Even if it adheres strongly.
A board 10 according to the present invention is a plurality of compression-molded flat so that leaves are cut and each stem has the same thickness, and a pair of flat skin layers 11a are removed to expose a core 11b. A plurality of plant stems 11 and a first adhesive 21 that is applied to both flat surfaces of the plurality of plant stems 11 and aligns the cores 11b that are exposed on the flat surfaces by arranging the plurality of plant stems 11 in a line. . The plant stalk 11 is a stalk of a gramineous plant made of corn, high rye or sugar cane, or a stalk of a asteraceae plant made of sunflower.
[Selection] Figure 1

Description

  The present invention relates to a board using stems such as corn, high candy or sugar cane, a composite board in which face materials are laminated and bonded to the board, and a method for manufacturing these boards.

  Conventionally, as this type of board, a plurality of high culm stems having an epidermis, a core and a knot without being cut in the fiber direction are arranged in parallel and closely to each other to form a high culm layer. There has been disclosed a laminated material in which a plurality of high potato stem layers are laminated and each high potato stalk is adhered to each other in a flat state (see, for example, Patent Document 1). In this laminated material, the high stalk layer is composed of a plurality of rolled high stalks, and the high stalks constituting the high stalk layer are stacked so as to intersect each high stalk layer. The

  The laminated material configured in this way is rolled with a high stalk not having an incision in the fiber direction with the skin, core and nodes, and a plurality of high stalks so that the rolled surface becomes the layer surface and the layer back surface. The stalks are arranged in parallel and closely to each other to form a high stalk layer, and an adhesive such as an isocyanate adhesive is applied to the high stalk layer. Manufactured by laminating a stalk layer and press-molding it. Here, in order to flatten the high stalks of the constituent elements, there are a method performed by a rolling mill or a press device alone, or a method combining these. For example, after rolling the roll interval of the rolling mill and temporarily rolling every high stalk, a high stalk layer is formed and an adhesive such as an isocyanate adhesive is applied, and these high stalk layers are applied. It is preferable to use a method of laminating and further compression-molding with a press device because a laminate material with high strength is obtained. In addition, the pressure conditions when laminating and compressing a plurality of high stalk layers coated with an adhesive such as an isocyanate-based adhesive are the adhesive used, the number of layers of the high stalk layer, Depending on the target specific gravity of the material, etc., it is selected from a temperature range of room temperature to 180 ° C. and a pressure range of 0.5 to 3 MPa.

  Laminated materials produced in this way are abundant in the world and are high in a simplified process that uses high stalks, which were difficult to dispose of, as the main raw material and eliminates the need for a conventional slitting process. Because it can be manufactured with work efficiency, the price is even lower. Further, since the above-mentioned laminated material leaves the core without incising the high stalk, it has a large number of fine holes inside, and is more lightweight and has high sound absorption characteristics and heat insulation characteristics, resulting in a bulky laminated material. Moreover, since the epidermis of a high stalk is utilized as it is without being divided, it has high strength. Furthermore, since it is a structure where a bulky high stalk layer is laminated, a thick plate can be constituted with a small number of high stalks.

JP-A-1-280538 (Claims 1-3, 5 and 7, Specification page 2, lower left column, line 15-Same page, lower right column, line 1, Specification page 2, lower right column, line 13- 15th line of the same column, upper right column of the third page of the specification, 5th line to 9th line of the same column, lower page of the third page of the specification, 12th line to lower right column of the same page, 4th line, FIG. 1)

  However, in the laminated material shown in the above-mentioned conventional Patent Document 1, after applying an isocyanate-based adhesive to a plurality of high stalk layers, these high stalk layers are stacked and compression molded with a press device. For this reason, there is a problem in that the adhesive strength between the high stalk layers decreases unless the plurality of high stalk layers accommodated in the press device is heated. For this reason, in the laminated material shown by the said conventional patent document 1, since it is necessary to use a special heat press apparatus, there also existed a problem that a manufacturing facility enlarged and installation cost increased.

  The purpose of the present invention is to easily and strongly bond plant stems to each other when using a safer water-based adhesive from the viewpoint of the working environment, disaster prevention and pollution, thereby increasing the size of the production equipment and reducing the equipment cost. An object of the present invention is to provide a board using a plant stalk and a method for producing the same, which does not require an increasing special heat press device and can be strongly bonded even if the cores are bonded together at room temperature without heating. Another object of the present invention is that it is possible to easily and strongly bond the plant stalk and the face material constituting the board, thereby eliminating the need for a special heat press apparatus that increases the manufacturing equipment size and equipment cost. Another object of the present invention is to provide a composite board using plant stems and a method for producing the same, which can be strongly bonded even if each plant stem and the face material constituting the board are bonded at room temperature without heating.

  The first aspect of the present invention is that, as shown in FIGS. 1 to 3, the leaves are cut and flatly compressed so that each stem has the same thickness, and a pair of flat skin layers 11 a are partially formed. Or a plurality of plant stems 11 where the core part 11b is partially or entirely exposed, and a plurality of plant stems 11 applied to both flat surfaces of the plurality of plant stems 11 and arranged in a row. It is the board using the plant stalk provided with the 1st adhesive agent 21 which adhere | attaches the core parts 11b exposed to.

  The second aspect of the present invention is the invention based on the first aspect, and as shown in FIG. 3, is the plant stem 11 a stem of a gramineous plant made of corn, high rye or sugar cane? Or a stem of a asteraceae plant composed of sunflower.

  The third aspect of the present invention is an invention based on the first aspect, and is characterized in that the moisture content of the plant stem 11 is adjusted to 5 to 500% as shown in FIG.

  A fourth aspect of the present invention is an invention based on the first aspect, and is further characterized in that the first adhesive 21 is a water-based adhesive as shown in FIG.

  As shown in FIGS. 6 to 8, the fifth aspect of the present invention is the board 10 according to any one of the first to fourth aspects and the skin layer 11 a on either or both sides of the board 10. Is removed partially or entirely, and the face material 31 laminated on the surface where the core part 11b is partially or entirely exposed, and the second adhesion for adhering the face material 31 to the exposed surface of the core part 11b of the board 10 A composite board provided with the agent 32.

  A sixth aspect of the present invention is an invention based on the fifth aspect, and is further characterized in that the second adhesive 32 is a water-based adhesive as shown in FIG.

  7th viewpoint of this invention is invention based on 5th viewpoint, Comprising: As shown in FIG.6 and FIG.7, the face material 31 is a medium density fiber board, a particle board, a single board, or paper. It is characterized by.

  As shown in FIGS. 1 to 3, the eighth aspect of the present invention is a cutting step for cutting leaves of a plurality of plant stems 11 and a plurality of plant stems 11 from which the leaves have been cut off. A dipping step of immersing in the fungicide solution, a moisture content adjusting step of adjusting the moisture content of the plurality of plant stems 11 immersed in this insect repellent and fungicide solution to a predetermined ratio, and the moisture content were adjusted. A compression molding step of compressing and flattening a plurality of plant stems 11 to the same thickness, and polishing both flat surfaces of the plurality of plant stems 11 that have been compression molded to both sides of the plurality of plant stems 11 A first polishing step in which the skin layer 11a located on the flat surface is partially or entirely removed to expose the core portion 11b partially or entirely, and both of the plurality of plant stems 11 whose both flat surfaces are polished. A first adhesive application step of applying the first adhesive 21 to the flat surface, and the first adhesive 21 A plurality of plant stalks 11 which are fabric is a manufacturing method of boards using plant stems and a first bonding step of bonding the core 11b to each other via the first adhesive 21 arranged in a line.

  A ninth aspect of the present invention is an invention based on the eighth aspect, and as shown in FIG. 3, the plant stem 11 is a stem of a gramineous plant made of corn, high rye or sugar cane. Or a stem of a asteraceae plant consisting of sunflowers.

  The tenth aspect of the present invention is an invention based on the eighth aspect, and as shown in FIG. 3, in the moisture content adjustment step, the moisture content of the plant stem 11 is adjusted to 5 to 500%. Features.

  The eleventh aspect of the present invention is an invention based on the eighth aspect, and as shown in FIG. 4, a plurality of plant stems 11 are obtained by using spacers 12c having a predetermined thickness in the compression molding step. Are compression-molded to the same thickness.

  A twelfth aspect of the present invention is an invention based on the eighth aspect, and is further characterized in that the first adhesive 21 is a water-based adhesive as shown in FIG.

  As shown in FIGS. 6 to 8, the thirteenth aspect of the present invention is to polish either or both of the both surfaces of the board 10 manufactured by the method according to any of the eighth to twelfth aspects. Then, the second adhesive 32 is applied to the surface of the polished board 10 from which the skin layer 11a has been removed, and a second polishing step in which the skin layer 11a is partially or completely removed to expose the core portion 11b. And a second bonding step of bonding the face material 31 via the second adhesive 32 to the surface of the board 10 on which the second adhesive 32 is applied and the core 11b is exposed. Is a method for manufacturing a composite board.

  A fourteenth aspect of the present invention is an invention based on the thirteenth aspect, and is further characterized in that the second adhesive 32 is a water-based adhesive as shown in FIG.

  A fifteenth aspect of the present invention is an invention based on the thirteenth aspect, and as shown in FIGS. 6 and 7, the face material 31 is a medium density fiberboard, particle board, veneer or paper. It is characterized by.

  In the board of the first aspect or the board of the eighth aspect of the present invention, the flat skin layer of a plurality of plant stems is partially or entirely removed, and the core is partially or entirely. When exposed and the cores are bonded to each other with the first adhesive, the wax layer that hinders the development of adhesiveness at room temperature is partially or completely removed, and the core having good adhesiveness at room temperature is partially Or since all are exposed, it can adhere | attach more easily and strongly than the case where the skin layers of each plant stem are adhere | attached. As a result, the board can be manufactured without using a special heat press apparatus in which the manufacturing equipment becomes large and the equipment costs increase.

  In the board manufacturing method according to the fourth aspect of the present invention or the board according to the twelfth aspect, since the first adhesive that bonds the cores of a plurality of plant stems is an aqueous adhesive, the cores are at room temperature. It can be strongly bonded even if it is bonded. As a result, since it is not necessary to heat at the time of bonding, a strong board can be manufactured relatively easily.

  In the method of manufacturing the composite board of the fifth aspect or the composite board of the thirteenth aspect of the present invention, the core portion is partially removed by partially or entirely removing either or both of the skin layers on both sides of the board. Or if all the plants are exposed and the core part and the face material of each plant stem located on either one or both sides of the board are bonded with the second adhesive, each plant located on either one or both sides of the board It can be bonded more easily and strongly than when the stem skin layer and the face material are bonded. As a result, the composite board can be manufactured without using a special heat press apparatus in which the manufacturing equipment becomes large and the equipment costs increase.

  In the composite board according to the sixth aspect or the composite board according to the fourteenth aspect of the present invention, a second method for bonding the core part of each plant stem and the face material located on either one or both sides of the board. Since the adhesive is a water-based adhesive, it can be strongly bonded even if the core of each plant stalk and the face material located on either or both sides of the board are bonded at room temperature. As a result, since it is not necessary to heat at the time of bonding, a strong composite board can be manufactured relatively easily.

It is a perspective view of the board of 1st Embodiment of this invention. It is the sectional view on the AA line of FIG. (A) is a perspective view of a corn stalk from which leaves have been removed, (b) is a perspective view of a corn stalk that has been compression-molded, and (c) is a perspective view of a corn stalk with both flat surfaces polished. is there. It is process drawing which shows the procedure which compression-molds a corn stalk with a press apparatus. It is process drawing which shows the procedure which grinds a corn stalk with a stalk polisher. It is a perspective view of the composite board of 2nd Embodiment of this invention. It is the BB sectional view taken on the line of FIG. (A) is a perspective view of the board which adhere | attached core parts, (b) is a perspective view of the board which grind | polished the lower surface. It is process drawing which shows the procedure which grind | polishes a board with a board grinding | polishing apparatus. It is a perspective view of the composite board of 3rd Embodiment of this invention. It is CC sectional view taken on the line of FIG.

Next, an embodiment for carrying out the present invention will be described with reference to the drawings.
<First Embodiment>
Examples of the plant stalk 11 constituting the board 10 of the present embodiment include a stalk of a gramineous plant made of corn, high rye or sugar cane, or a stalk of a asteraceae plant made of sunflower. In this embodiment, the plant stem 11 is a corn stalk. As shown in FIGS. 1 to 3, the board 10 is flatly compressed so that the leaves are cut and the stems 11 have the same thickness, and a pair of flat skin layers 11 a are partially or completely removed. And a plurality of corn stalks 11 in which the core part 11b is partially or entirely exposed, and a wick that is applied to both flat surfaces of the corn stalks 11 and a plurality of corn stalks 11 are arranged in a row and exposed to the flat surface. And a first adhesive 21 that bonds the portions 11b together. The corn stalk 11 has the node part 11c provided at intervals in the longitudinal direction of the corn stalk 11 in addition to the skin layer 11a and the core part 11b. Moreover, the moisture content of the corn stalk 11 is adjusted within the range of 5-500%, preferably 10-300%. Here, the moisture content of the corn stalk 11 is limited to the range of 5 to 500%. If it is less than 5%, the stalk is cracked at the time of compression molding or the thickness of the stalk is uneven. This is because the drying time after molding becomes longer and the working efficiency during the production decreases. Moreover, the diameter before compression molding of the corn stalk 11 is set to D (FIG. 3 (a)), and the width | variety between a pair of flat surfaces from which the corn stalk 11 was compression-molded and the skin layer was removed is set to W (FIG.2 and FIG.3). When (c)), W is set within a range of 0.3D to 0.9D, preferably 0.5D to 0.8D. Here, the reason why W is limited to the range of 0.3D to 0.9D is that, if it is less than 0.3D, each corn stalk 11 breaks along the fiber and separates into a plurality of pieces, exceeding 0.9D. This is because the area of the flat surface serving as the bonding surface becomes small and a predetermined bonding strength cannot be secured. Furthermore, it is preferable to use a water-based adhesive as the first adhesive 21. Examples of the aqueous adhesive include acrylic emulsion adhesive, SBR emulsion adhesive, vinyl acetate emulsion adhesive, and aqueous vinyl urethane adhesive. Note that the water content of the corn stalk 11 is [(W ₁ when the mass of the corn stalk 11 in any state is W ₁ and the mass (absolute dry mass) of the corn stalk 11 in an absolutely dry state is W _2]. -W ₂₎ / W _2] is calculated by × 100%. That is, the moisture content of the corn stalk 11 is expressed as a percentage of the moisture content of the corn stalk 11 with respect to the absolutely dry mass.

  On the other hand, in the portion of the skin layer 11a that is in contact with the outside world, although not shown, cutin made of unsaturated fatty acid or a polymer thereof and wax (wax) made of water-insoluble fatty acid ester accumulated. A cuticular layer is formed. This cuticle layer has a function of preventing the passage of water to prevent water evaporation and water intrusion, and to prevent invasion of pathogenic bacteria. On the other hand, the core 11b hardly contains the wax. As a result, when the skin layers 11a of the corn stalks 11 are bonded to each other with the water-based adhesive of the first adhesive 21, since the wax of the cuticle layer is present on the bonding surface, the adhesive strength is reduced, but the core of the corn stalk 11 is reduced. When the parts 11b are bonded to each other with the water-based adhesive of the first adhesive 21, the adhesive force becomes strong because there is almost no wax on the bonding surface.

  The manufacturing method of the board 10 using the corn stalk 11 comprised in this way is demonstrated. First, the leaves of a plurality of corn stalks 11 are excised and cut to a predetermined length (FIG. 3 (a)), and then the corn stalks 11 are cut and cut to a predetermined length. Immerse in insect repellent and fungicide solution. Examples of the insect repellent / fungicide liquid include bifenthrin, permethrin, pyrethroid, imidazole and the like. Next, after adjusting the moisture content of the plurality of corn stalks 11 soaked with the insect repellent and fungicidal solution to 5 to 500%, preferably 10 to 300%, the plurality of corn stalks having the adjusted moisture content are adjusted. 11 is compressed to the same thickness and flattened (FIG. 3B). Here, in order to compress and form the corn stalk 11, the press apparatus 12 as shown in FIG. 4 is used. The pressing device 12 includes a bed 12a having an upper surface on which a corn stalk 11 is placed formed on a horizontal plane, and an elevating unit provided on the bed 12a so as to face the bed 12a and having a lower surface formed on a horizontal plane. It has a possible slider 12b and a spacer 12c having a predetermined thickness placed on the upper end of the bed 12a. The thickness of the spacer 12c is set in consideration of the flatness of the compressed corn stalk 11 and the springback of the corn stalk 11 that has been compression molded. The flatness [(ab) / a] (a: major axis, b: minor axis) (FIG. 3 (b)) of the corn stalk 11 that has been compression-molded is that the corn stalk 11 is compression-molded and the skin layer 11a is The width W (FIG. 2 and FIG. 3 (c)) between the pair of removed flat surfaces is within the range of 0.3D to 0.9D, preferably 0.5D to 0.8D (FIG. 3 (a)). Is set to be Note that the spring back of the corn stalk 11 that has been compression-molded means that when the corn stalk 11 is compression-molded by the press device 12 and then the slider 12b is lifted and separated from the corn stalk 11, the corn stalk 11 is slightly restored. A phenomenon that deforms in the return direction. After a plurality of corn stalks 11 are placed on the bed 12a of the press device 12 (FIG. 4A), the slider 12b is lowered until the lower surface abuts against the upper surface of the spacer 12c, and the plurality of corn stalks 11 are compressed. (FIG. 4B), the slider 12b is raised (FIG. 4C). Thereby, a plurality of corn stalks 11 are compression-molded by the press device 12.

  Next, both flat surfaces of the plurality of compression-molded corn stalks 11 are polished to partially or completely remove the skin layers 11a located on the two flat surfaces of the corn stalks 11, thereby partially forming the core part 11b. Or completely exposed (FIG. 3C). Here, in order to polish both flat surfaces of the corn stalk 11, a stalk polishing apparatus 13 as shown in FIG. 5 is used. This stalk polishing device 13 is a slide bed 13a that can reciprocate horizontally in order to place a corn stalk 11 that is compressed into a flat shape, and a motor (not shown) located above the center of the reciprocating range of this slide bed 13a. A driving roller 13b that is rotationally driven by the motor, a driven roller 13c that is positioned below the driving roller 13b and above the upper surface of the slide bed 13a, and is rotatably provided, and the driving roller 13b and the driven roller 13c. A belt 13d that is stretched and has abrasive grains bonded to the outer peripheral surface thereof, a tension applying mechanism (not shown) that applies a predetermined tension to the belt 13d by adjusting the distance between the driving roller 13b and the driven roller 13c, and The belt 13d to which tension is applied is moved up and down together with the driving roller 13b and the driven roller 13c, and the belt 13d is moved to the slide bed Corn stalks 11 on 3a and a lifting-pressing mechanism for pressing at a predetermined pressure (not shown). A plurality of flat corn stalks 11 are fixed on the slide bed 13a of the stalk polishing apparatus 13 (FIG. 5 (a)), and the belt 13d is rotated together with the driving roller 13b and the driven roller 13c. The slide bed 13a is reciprocated in a state where the belt 13d is lowered together with the driving roller 13b and the driven roller 13c by the pressure contact mechanism (FIGS. 5A and 5B). Thereby, one flat surface of the plurality of corn stalks 11 is polished, and the skin layer 11a of one flat surface is partially or entirely removed, and the core portion 11b is partially or entirely exposed. Thereafter, the plurality of corn stalks 11 on the slide bed 13a are turned over, and the other flat surface of the plurality of corn stalks 11 is polished in the same process as described above, so that the other flat flat skin layer 11a is partially formed. The core part 11b is partially or entirely exposed by removing all or all. Further, after the first adhesive 21 is applied to both flat surfaces of the plurality of corn stalks 11 whose both flat surfaces are polished, the plurality of corn stalks 11 coated with the first adhesive 21 are arranged in a line. The core portions 11 b are bonded to each other through the first adhesive 21. Thereby, the board 10 is manufactured. When a plurality of corn stalks 11 are arranged in a row and the core portions 11b are bonded to each other via the first adhesive 21, the pressure is applied to the plurality of corn stalks 11 arranged in a row so that the bonding surfaces are in close contact with each other. Is preferably given.

  In the board 10 manufactured in this manner, the flat skin layer 11a of the plurality of corn stalks 11 is partially or entirely removed by the stem polishing device 13 to expose the core part 11b partially or entirely, and the core When the parts 11b are bonded to each other by the first adhesive 21, the wax layer that prevents the expression of adhesiveness at room temperature is partially or completely removed, and the core part 11b having good adhesiveness at room temperature is partially or Since all are exposed, it can adhere | attach more easily and strongly than the case where the skin layers 11a of each corn stalk 11 adhere | attach. As a result, the board 10 can be manufactured without using a special heat press apparatus in which the manufacturing equipment becomes large and equipment costs increase. Moreover, since the 1st adhesive agent 21 which adhere | attaches the core parts 11b of the multiple corn stalk 11 is a water-system adhesive agent, even if it adhere | attaches the core parts 11b at room temperature, it can adhere | attach strongly. As a result, since it is not necessary to heat at the time of bonding, the strong board 10 can be manufactured relatively easily. In addition, both surfaces of the board may be polished to form both surfaces of the board on a smooth surface. This improves the appearance of both sides of the board.

<Second Embodiment>
6 to 9 show a second embodiment of the present invention. 6 to 9, the same reference numerals as those in FIGS. 1 to 5 denote the same components. In the composite board 30 of this embodiment, the board 10 of the first embodiment and the skin layer 11a on one surface of the board 10 are partially or completely removed, and the core portion 11b is partially or entirely exposed. A first face member 31 laminated on the finished face, and a second adhesive 32 for bonding the first face member 31 to the exposed one face of the core portion 11b of the board 10. Examples of the first face material 31 include a medium density fiber board (MDF), a particle board, a single board, and paper. Further, it is preferable to use a water-based adhesive as the second adhesive 32. Examples of the aqueous adhesive include acrylic emulsion adhesive, SBR emulsion adhesive, vinyl acetate emulsion adhesive, and aqueous vinyl urethane adhesive. The configuration other than the above is the same as that of the first embodiment.

  A method for manufacturing the composite board 30 configured as described above will be described. First, one surface of the board 10 is polished to remove part or all of the skin layer 11a to expose part or all of the core part 11b (FIG. 8B). Here, in order to polish one surface of the board 10, a board polishing apparatus 33 as shown in FIG. 9 is used. This board polishing apparatus 33 is configured in the same manner as the stem polishing apparatus of the first embodiment. That is, the board polishing apparatus 33 is positioned at the upper center of the reciprocating range of the slide bed 33a for reciprocating in the horizontal direction for placing the board 10, and is rotationally driven by a motor (not shown). A driving roller 33b, a driven roller 33c that is positioned below the driving roller 33b and above the upper surface of the slide bed 33a, and is rotatably provided. The driving roller 33b and the driven roller 33c are stretched over the outer peripheral surface. A belt 33d to which abrasive grains are bonded, a tension applying mechanism (not shown) that applies a predetermined tension to the belt 33d by adjusting the distance between the driving roller 33b and the driven roller 33c, and a belt to which this tension is applied 33d is moved up and down together with the driving roller 33b and the driven roller 33c, and the belt 33d is moved to the board 10 on the slide bed 33a. And a lifting-pressing mechanism for pressing at a constant pressure (not shown). The board 10 is fixed on the slide bed 33a of the board polishing device 33 so that one surface thereof faces upward (FIG. 9A), and the belt 33d is rotated together with the driving roller 33b and the driven roller 33c, and is moved up and down. The slide bed 33a is reciprocated in a state where the belt 33d is lowered together with the driving roller 33b and the driven roller 33c by the pressure contact mechanism (FIGS. 9A and 9B). As a result, one side of the board 10 is polished, and the skin layer 11a of each corn stalk 11 located on one side of the board 10 is partially or completely removed, and each corn located on one side of the board 10 is removed. The core 11b of the stem 11 is partially or entirely exposed. Next, after the second adhesive 32 is applied to one surface of the board 10 where the core 11b of each corn stalk 11 is exposed, the second adhesive 32 is applied to one surface of the board 10 to which the second adhesive 32 is applied. The first face material 31 is bonded through the adhesive 32. Thereby, the composite board 30 is manufactured. In addition, when bonding the board 10 and the 1st face material 31 via the 2nd adhesive agent 32, it is preferable to apply a pressure to the board 10 and the 1st face material 31 so that an adhesive surface may closely_contact | adhere.

  In the composite board 30 manufactured in this way, the skin layer 11a of the plurality of corn stalks 11 located on one surface of the board 10 is partially or entirely removed by the board polishing apparatus 33, and the core part 11b is partially removed. When the core 11b and the first face material 31 are bonded to each other by the second adhesive 32, the wax layer that prevents the expression of adhesiveness at room temperature is partially or completely removed, and the room temperature is increased. Since the core part 11b with good adhesion is partially or entirely exposed, it is easier than the case where the skin layer 11a of each corn stalk 11 and the first face material 31 are located on one side of the board 10 It can be bonded firmly and strongly. As a result, the composite board 30 can be manufactured without using a special heat press apparatus in which the manufacturing equipment becomes large and the equipment costs increase. Moreover, since the 2nd adhesive agent 32 which adhere | attaches the core part 11b and the 1st surface material 31 of the corn stalk 11 located in one side of the board 10 is a water-system adhesive agent, one of the boards 10 is carried out at room temperature. Even if the core part 11b of each corn stalk 11 located on the surface and the first face material 31 are bonded, they can be strongly bonded. As a result, since it is not necessary to heat at the time of bonding, the composite board 30 stronger than the board 10 of the first embodiment can be manufactured relatively easily. The other surface of the composite board may be polished to form the other surface of the composite board as a smooth surface. This smoothes the other side of the composite board and improves the appearance.

<Third Embodiment>
10 and 11 show a third embodiment of the present invention. 10 and 11, the same reference numerals as those in FIGS. 6 and 7 denote the same components. In this embodiment, the composite board 50 includes the composite board 30 of the second embodiment, and the skin layer 11a on the other surface of the composite board 30 is partially or entirely removed, so that the core portion 11b is partially removed. Or the 2nd surface material 52 laminated | stacked on the surface where all were exposed, and the 2nd adhesive agent 62 which adhere | attaches the 2nd surface material 52 on the other surface where the core part 11b of the composite board 30 was exposed. Examples of the second face material 52 include a medium density fiber board (MDF), a particle board, a single board, paper, and the like, similarly to the face material 31 of the second embodiment. Moreover, as the 2nd adhesive agent 62, it is preferable that it is a water-system adhesive agent similarly to the 2nd adhesive agent 32 of 2nd Embodiment. The configuration other than the above is the same as that of the second embodiment.

  The composite board 50 configured as described above is similar to the procedure for adhering the first face material 31 to one surface of the board 10 in the second embodiment, and is the composite board 30 of the second embodiment. It is manufactured by adhering the second face material 52 to the other surface of the second member. It should be noted that when the second face material 52 is bonded to the other surface of the composite board 30 of the second embodiment via the second adhesive 62, the bonding surface is in close contact with that of the second embodiment. It is preferable to apply pressure to the composite board 30 and the second face material 52.

  The composite board 50 manufactured in this way is stronger than the composite board 30 of the second embodiment, and the appearance of the other surface of the composite board 50 is further improved. Since operations and effects other than those described above are substantially the same as those of the second embodiment, repeated description will be omitted.

10 Board 11 Corn stem (plant stem)
11a skin layer 11b core 12c spacer 21 first adhesive 30, 50 composite board 31 first face material (face material)
32, 62 Second adhesive 52 Second face material (face material)

Claims (15)

The leaves are excised and compressed so that each stem has the same thickness, and the pair of flat skin layers (11a) are partially or completely removed, and the core (11b) is partially or completely removed. Multiple exposed plant stems (11),
A first adhesive (21) which is applied to both flat surfaces of the plurality of plant stems (11) and aligns the cores (11b) which are exposed on the flat surface by arranging the plurality of plant stems (11) in a line. ) And a board using plant stems.   The board according to claim 1, wherein the plant stalk (11) is a stalk of a gramineous plant made of corn, high cocoon or sugar cane, or a stalk of a asteraceae plant made of sunflower.   The board according to claim 1, wherein the moisture content of the plant stem (11) is adjusted to 5 to 500%.   The board according to claim 1, wherein the first adhesive (21) is a water-based adhesive. A board (10) according to any one of claims 1 to 4,
One or both of the skin layers (11a) of the board (10) are partially or completely removed, and the core (11b) is laminated on the surface where the core (11b) is partially or entirely exposed (31 , 52) and
A composite board comprising: a second adhesive (32, 62) for bonding the face material (31, 52) to an exposed surface of the core (11b) of the board (10).   The composite board according to claim 5, wherein the second adhesive is a water-based adhesive.   6. The composite board according to claim 5, wherein the face material (31, 52) is a medium density fiber board, particle board, single board or paper. Excision process to excise the leaves of multiple plant stems (11),
A dipping step of dipping a plurality of plant stems (11) from which the leaves have been excised in an insect repellent and fungicide solution,
A moisture content adjusting step of adjusting the moisture content of the plurality of plant stems (11) immersed in the insect repellent and fungicidal solution to a predetermined ratio;
A compression molding step to flatten the plurality of plant stems (11) with the moisture content adjusted to the same thickness, respectively,
Polishing both flat surfaces of the plurality of compressed plant stalks (11) to remove part or all of the epidermis layer (11a) located on both flat surfaces of the plurality of plant stalks (11) A first polishing step for exposing part or all of the core part (11b);
A first adhesive application step of applying a first adhesive (21) to both flat surfaces of a plurality of plant stems (11) whose both flat surfaces have been polished;
A first bonding step in which a plurality of plant stems (11) coated with the first adhesive (21) are arranged in a line and the cores (11b) are bonded to each other via the first adhesive (21); A method for producing a board using a plant stem containing   9. The method for producing a board according to claim 8, wherein the plant stem (11) is a stem of a gramineous plant made of corn, high coconut or sugar cane, or a stem of a asteraceae plant made of sunflower.   The board manufacturing method according to claim 8, wherein in the moisture content adjusting step, the moisture content of the plant stem (11) is adjusted to 5 to 500%.   The board manufacturing method according to claim 8, wherein in the compression molding step, the plurality of plant stems (11) are respectively compression molded to have the same thickness by using a spacer (12c) having a predetermined thickness.   The board manufacturing method according to claim 8, wherein the first adhesive is a water-based adhesive. A core part (11b) is obtained by polishing one or both sides of the board (10) produced by the method according to any one of claims 8 to 12 to remove part or all of the skin layer (11a). ) A second polishing step that exposes part or all of
Applying a second adhesive (32, 62) to the surface of the polished board (10) from which the skin layer (11a) has been removed;
A face material (31, 52) is applied to the surface of the board (10) to which the core (11b) of the board (10) coated with the second adhesive (32, 62) is exposed via the second adhesive (32, 62). A method for manufacturing a composite board, comprising: a second bonding step for bonding.   The method for manufacturing a composite board according to claim 13, wherein the second adhesive (32, 62) is a water-based adhesive.   The method of manufacturing a composite board according to claim 13, wherein the face material (31, 52) is a medium density fiberboard, particle board, single board or paper.

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