JP5992489B2 - Board additive, board and method for producing the same - Google Patents

Description

  The present invention relates to a board additive, a board, a board additive manufacturing method, a board manufacturing method, a board strength improving method, and a board water resistance improving method.

  In recent years, with the growth of beverages such as tea-based beverages and coffee beverages, beverage factories and the like have discharged large amounts of manufacturing residues such as tea husks and coffee husks after the extraction of beverage liquids, and these amounts have increased year by year. Yes. In addition to the above-mentioned food residues such as beverage residues, there are many types of waste produced in the manufacturing process or disposal process of various industrial products. Use, reuse and effective use of waste materials are also indispensable for environmental protection and resource utilization.

Among various waste materials, one of the materials that are used as environmentally friendly recycled materials is wood waste materials obtained from thinned wood, sawdust and waste from sawmills, and house demolition waste. These wood waste wood fibers and powder can be processed by molding, compression, etc. to produce so-called wood boards called insulation boards (fiber boards), particle boards and hard boards. It can be used for a wide variety of applications such as floors and insulation.

As one of methods for effectively utilizing the above-mentioned production beverages of taste beverages, a technique is known in which tea husk, which is the production residue of tea-based beverages, is blended with the wooden board material (see, for example, Patent Document 1). ). Since the tea shells of green tea beverages have antibacterial and deodorizing effects, this is a recycling means that can be expected to have an effect in addition to the resource utilization effect of the wooden board.

On the other hand, the beverage residue includes so-called barley tea bowl of roasted barley after extraction of grain drinks such as barley tea in addition to the above-mentioned tea shells. With the increase in tea-based beverages, the amount of cereal-based production residues such as barley teacups as well as tea husks has been increasing year by year.

  As a method for effectively using a by-product obtained from cereals, for example, a method for producing a paper blended with a grain seed skin is known (see Patent Document 2). In addition, papers containing non-wood pulp obtained from cereal stems and leaves such as rice straw and wheat straw are disclosed (for example, see Patent Documents 3 to 5).

JP 2002-321205 A Japanese Patent Application Laid-Open No. 7-145592 JP 2001-039014 A JP-A-8-013367 Special table 2011-505505 gazette

  When the production residue (green tea husk) of the tea-based beverage is blended into the board as in Patent Document 1, the obtained board has an antibacterial effect, but it is stronger than the board without the tea husk. There was a strong demand for wooden boards that could not be more than equivalent in terms of durability, such as water resistance, and that the residue could be used effectively and the strength was further increased.

On the other hand, unlike tea-based beverages and coffee beverages, it cannot be said that the production residue of grain beverages is sufficiently utilized. For example, the method of Patent Document 3 does not effectively use the seed part (part other than the seed skin part) of the grain mainly contained in the production residue of the grain beverage. Further, as described above, papers containing the stems and leaves of various plants including cereals have been known so far, but it has not been known to add cereal seeds to the board.

  By the way, in the field of paper, it has been already known to add refined fine starch such as viscous corn starch in order to enhance so-called “paper strength” such as tensile strength. A similar effect can be expected in the manufacturing process of the wooden board. However, using corn starch as a food separately as a board enhancer has never been desirable from the viewpoint of manufacturing cost and resource saving.

Therefore, the present inventor has paid attention to the starchy substance contained in the seed part of the heated cereal such as beverage manufacturing residue, and found that this is used for enhancing the strength and water resistance of the wooden board. Attempts were made to mix the production residue of cereal beverages with the board to reduce the affinity and dispersibility from the wood fiber slurry during the board production process, resulting in the strength and water resistance of the board. It has been found that there is a problem that the effect of enhancing sex cannot be fully exhibited.

  The present invention solves such a problem, can effectively use barley tea bowl, is difficult to detach from the wood fiber slurry in the wood board manufacturing process, and can enhance the strength and water resistance of the board. An object of the present invention is to provide a board having a board additive and enhanced strength and water resistance of the board.

  As a result of earnest research, the inventor has found that strength and water resistance are enhanced by blending a grain seed part adjusted to a predetermined particle size into a board, and has completed the present invention.

  That is, firstly, the present invention is a board additive containing a grain seed part, wherein the grain seed part has a particle diameter that passes through a sieve having an opening of 2 mm as defined in JIS Z8801-1: 2006. A board additive characterized by the above is provided (Invention 1).

  In the said invention (invention 1), it is preferable that the seed part of the said grain has a particle size which does not pass the sieve of 200 micrometers of openings prescribed | regulated to JISZ8801-1: 2006 (invention 2).

  In the said invention (invention 1 and 2), it is preferable that the seed part of the said grain is a wet state (invention 3), and the moisture content of the seed part of the said grain is 50-99 mass%. Preferred (Invention 4).

  In the said invention (invention 1-4), it is preferable that the seed part of the said grain is a manufacturing residue of a grain drink (invention 5), and it is preferable that the said grain is barley (invention 6).

  2ndly this invention provides the board characterized by the board | substrate additive which concerns on the said invention (invention 1-6) being mix | blended (invention 7).

  The board according to the above invention (Invention 7) is easy to manufacture and has enhanced board strength and water resistance since the above board additive is blended.

  In the said invention (invention 7), the said board additive is mix | blended so that the mass of the seed part of the said grain may become 2-17 mass% in conversion of dry solid content with respect to the total mass of a wood material and the seed part of the said grain Preferably, the content of the board additive when measured for 1 kg of the board in dry mass is 20 to 170 g in terms of dry solid content of the seed part of the grain. (Invention 9)

  Thirdly, the present invention provides a board addition characterized by using a grain seed part adjusted to pass through a sieve having a nominal opening of 2 mm as defined in JIS Z8801-1: 2006 as a board additive. A method for producing a material is provided (Invention 10).

  4thly this invention provides the manufacturing method of the board characterized by mix | blending the board additive which concerns on the said invention (invention 1-6) with a wooden material (invention 11).

  In the said invention (invention 11), the said board additive so that the mass of the seed part of the said grain with respect to the total mass of the said wood material and the seed part of the said grain may be 2-17 mass% in conversion of dry solid content Is preferably blended (Invention 12).

  Fifthly, the present invention provides a board strength improvement method and a water resistance improvement method characterized in that the board additive according to the above inventions (Inventions 1 to 6) is blended with a wooden material (Invention 13).

  The board additive according to the present invention can enhance the strength and water resistance of the blended board, and has an affinity and dispersibility that is difficult to detach from the wood fiber slurry in the board manufacturing process, and the strength and water resistance of the board. It will enhance the sex. Moreover, the board according to the present invention is easy to manufacture and has enhanced strength and water resistance.

Hereinafter, embodiments of the present invention will be described.
[Board additive, manufacturing method of board additive]
The board additive which concerns on this embodiment contains the seed part of a grain which has a particle size which passes the 2 mm opening sieve prescribed | regulated to JISZ8801-1: 2006. In the present embodiment, the phrase “containing a grain seed part” includes a concept consisting of only a grain seed part.

  The grain in the present embodiment refers to a plant that is cultivated to make seeds edible. Grains that can be used in this embodiment include barley, rice, wheat, rye, corn, millet, millet, millet, leguminous plants such as soybean, azuki bean, and solacey plants such as buckwheat and tartary buckwheat; These are exemplified, and these can be used alone or in combination of two or more. Among these, Gramineae plants and Capaceae plants are preferable, barley and rice are more preferable, and barley is particularly preferable. Furthermore, these grain seed parts are preferably heat-processed or roasted.

  Barley (scientific name: Hordeum vulgare) is a plant of the grass family, and examples include Nijo barley, Shijo barley, Rojo barley, and bare barley. Among these, Rojo barley and Nijo barley are preferable.

  The board in the present embodiment means a wood board such as plywood, particle board, fiber board, wood wool cement board, wood piece cement board, and preferably means a particle board. The particle board is sprayed with a synthetic resin adhesive on small pieces of wood (particles, chips, wood cut pieces, crushed pieces), deposited in a predetermined shape, and then hot-pressed to produce a specific gravity of 0.6-0. 8 plate products. It also means wood waste obtained as thinned wood, sawdust and waste from sawmills, and house demolition waste. These are the production of wood boards such as insulation boards (fiber boards), particle boards and hard boards. It is used for various purposes such as tatami floors and heat insulating materials. Such a wood board is manufactured by performing processing such as molding and compression on wood fiber and wood powder of wood waste materials.

  In this embodiment, the seed part of the grain is used. By using the grain seed part, the strength and water resistance of the board containing the board additive according to the present embodiment can be enhanced. Here, the “cereal seed part” (sometimes simply referred to as “cereal seed part”) in the present embodiment refers to a part other than the skin part (mainly composed of endosperm and germ) in the seed. “Board strength” preferably means the maximum load when a load is applied to the surface of the board. Furthermore, “water resistance of the board” is preferably based on the water absorption rate of the board. The “cereal seed part” does not necessarily mean a part obtained by removing 100% of the skin part, and a sufficient effect can be exhibited if the residual skin part is 30% by mass or less.

  As described above, since the stalks, leaves, and skins of seeds contain a large amount of plant fiber, it has heretofore been known to add these to paper raw materials. However, since the seed part of cereals does not contain abundant plant fibers, it has been thought that it has no function of enhancing strength and water resistance such as entanglement with the fibers in the wood and hydrogen bonds, so It has not been known to add a part other than the skin part to the board. Furthermore, it is not known at all that the strength and water resistance of the board are enhanced by blending the grain seed part, which is a new finding of the present inventor.

  The grain seed part has a particle size that passes through a sieve having an opening of 2 mm defined in JIS Z8801-1: 2006. Here, the present inventor has found that simply adding a grain seed part having no particle size adjustment to the board results in detachment from the wood fiber slurry in the production process, and the affinity and dispersibility are significantly deteriorated. More specifically, the grain seed portion that does not pass through the sieve having a mesh opening size of 2 mm, when the wood fiber mat (hydrated material) in the production process to be described later is dehydrated, the grain seed portion such as barley tea cake is added to the dewatered mat. Sticks firmly, or the affinity / dispersibility with the wood fiber slurry is poor and detaches. On the other hand, the grain seed part having a particle diameter passing through a sieve having an opening of 2 mm is entangled well with the wood fiber slurry, and as a result, the fixing rate to the board is good.

  The grain seed part preferably has a particle size that does not pass through a sieve having an opening of 200 μm as defined in JIS Z8801-1: 2006, particularly preferably has a particle size that does not pass through a sieve having an opening of 220 μm, and the opening More preferably, it has a particle size that does not pass through a 250 μm sieve. Since the grain seed part having such a particle size is difficult to pass through the wire (net) in the production process, the grain seed part is prevented from flowing into the dehydrating liquid, and the fixing rate to the wood fiber slurry is good. Most preferably, it is a grain seed part which passes through a sieve having an opening of 2 mm and does not pass through a sieve having an opening of 500 μm.

  In the present embodiment, the grain seed part is preferably in a wet state. More specifically, the moisture content of the grain seed part is preferably 50 to 99% by mass, particularly preferably 60 to 98% by mass, and further preferably 62 to 85% by mass, Is preferably 65 to 80% by mass. When the grain seed part is in a wet state, and the moisture content of the grain seed part is 50% by mass or more, the grain seed part is a wire (net) in a production process (wire part, press part, dryer part, etc.) described later. It becomes difficult to adhere to the wood fiber, the detachment from the wood fiber slurry is suppressed, and the affinity and dispersibility are remarkably improved. Further, when the moisture content is 99% by mass or less, the wood material as a raw material in the production process is not diluted even when the grain seed part is added, and the production of the board containing the grain seed part becomes easy.

  It is preferable that the said grain seed part is a manufacture residue of a grain drink. Here, the cereal beverage is a beverage produced using the seed part of the cereal as the main extraction raw material. For example, barley tea using barley, brown rice tea using rice (brown rice), corn tea using corn, buckwheat And buckwheat tea using tartary buckwheat. The production residue of these cereal drinks contains a cereal seed part, and the cereal seed part has a moisture content of approximately 50 to 99% by mass. It is particularly suitable for this embodiment. Moreover, since the production | generation residue of a grain drink was an unused resource until now, it is very preferable also from a viewpoint that this is used effectively and it does not give load to global environment.

  The grain seed part may be used as it is as a board additive, or may be blended with other additives or the like as long as the effects of the present embodiment are not impaired, and may be used as a board additive according to the present embodiment. Other additives include, for example, binders, strength enhancers, sizing agents, yield improvers, filtering agents, water repellents, bleaching agents, dyes, pigments, flocculants, adhesives, fillers, bulking agents, Examples include antifoaming agents, softening agents, deposit control agents, slime control agents, pitch control agents, and coagulants.

  The manufacturing method of the board additive according to the present embodiment, in particular, except for adjusting the particle size of the grain seed part so as to pass through a sieve with an opening of 2 mm, preferably not through a sieve with an opening of 200 μm. It is not limited. The grain size of the grain seed part can be adjusted, for example, by pulverizing the grain seed part according to a conventional method and then sieving using a sieve having a predetermined opening such as a sieve having an opening of 2 mm. Examples of the pulverization method include wet pulverization, dry pulverization, and the like. However, when the above-described cereal beverage production residue is used, drying before pulverization and adjustment of the moisture content after pulverization are not necessary. When used, wet pulverization is preferred because pulverized material may remain in the wire (net) part of the wire part, press part, and dryer part in the board manufacturing process. The board additive according to this embodiment can be obtained by using the grain seed part having the above particle size as it is or by blending other additives as desired.

  In addition, when adjusting the moisture content of the grain seed part to 50 to 99% by mass, for example, the grain seed part is immersed in water such as warm water for a certain period of time, filtered, and then dehydrated and dried as necessary. do it. Here, since the above-mentioned residue for producing a cereal beverage is obtained through such a process, it is particularly suitable as a cereal seed part used in this embodiment.

  The board additive according to the present embodiment described above can enhance the strength and water resistance of the blended board. In addition, the board additive of the present embodiment is less likely to be detached from the wood fiber slurry in the production process, and the affinity is improved, so that it is easy to produce a blended board.

[Board, board manufacturing method, board strength and water resistance enhancement method]
The board according to the present embodiment is produced by blending the wood additive with the board additive according to the above-described embodiment.

  The woody material is so-called wood generally used as a building material or a structural material, and may be in the form of a fiber or powder that can be prepared into a slurry. Examples of woody wood species include, for example, conifers such as cedar, birch, hiba, larch, pine, broadleaf trees such as chestnuts, hippopotamus, oak, shii, poplar, and willow, southern wood such as lauan, etc. Any tree species is acceptable. Wood waste such as industrial waste and construction waste can be used, such as wood fiber obtained by defibration of wood waste such as wood chips, wood powder obtained by pulverizing wood or sawdust generated in sawmill Wood powder or the like is used for the preparation of the slurry. It is also possible to use a mixture of wood fiber and wood powder as appropriate. The mixing ratio may be appropriately set in consideration of the strength and flexibility required for the wooden board and the moldability at the time of manufacture, and the wood fiber should be about 10% by weight (dry weight ratio) or more. preferable. Examples of means for defibrating wood chips to obtain wood fibers include a defibrator, a hammer mill, a ring breaker, and the like. From the standpoint of slurry preparation and the appearance of the resulting wood board, the wood fiber preferably has a fiber length of about 10 mm or less, and the wood powder preferably has a particle size of about 3 mm or less. However, if excessively fine fibers or powders are used, the wood board becomes brittle, and it may be necessary to use a large amount of binder in order to improve the shape retention.

  In the production of the wood board, first, a slurry in which the wood material and the board additive are dispersed in water is prepared. Depending on the characteristics required of the wood board to be manufactured, the mixing ratio of the wood material and the board additive may be adjusted as appropriate, and reinforcing materials such as carbon fibers and ceramic fibers and various additives may be blended. The blending ratio is desirably 3 parts by weight or less (dry weight ratio) with respect to 100 parts by weight of the total of the wood material and the board additive.

  The board according to the present embodiment is blended with the above-described board additive, and has enhanced strength and water resistance. For example, it is used in residential building materials such as heat insulating materials, medical building materials and mats, pet mats, and the like. Especially suitable. Therefore, the use of the conventional wooden board can be further expanded, and it contributes greatly to further improvement of the usefulness of the wooden board, combined with effective use or recycling of various wastes.

  In the present embodiment, the board additive is particularly 3 to 15 mass so that the mass of the grain seed part relative to the total mass of the wood material and the grain seed part is 2 to 17 mass% in terms of dry solid content. It is preferable to mix | blend with a wooden material so that it may become 3%, and also it may become 3-14 mass%. By blending the board additive so that the grain seed part is 2% by mass or more in terms of dry solid content, the strength and water resistance of the board can be enhanced more effectively. On the other hand, when the above-mentioned board additive is blended so that the grain seed part is 17% by mass or less in terms of dry solid content, in the wire part or press part of the production process, it adheres to the wire (net) from the wood fiber slurry. The detachment of the grain seed part is more effectively suppressed.

  In addition, the content of the board additive as measured for a board according to the present embodiment having a dry mass of 1 kg is preferably 20 to 170 g, particularly 30 to 150 g in terms of dry solid content of the seed part of the grain. It is preferable that it is 30-140g. When the content of the board additive is within such a range, strength and water resistance are effectively enhanced, and detachment of the grain seed part is effectively suppressed.

  When the maximum load of the board produced without blending the board additive is 1, the maximum load when drying the board according to the present embodiment produced by blending the board additive is 1.01 or more. It is preferable that it is particularly 1.09 or more. Moreover, when the water absorption amount of the board produced without blending the board additive material is 1, the water absorption amount of the board according to this embodiment produced by blending the board additive material is 0.99 or less. In particular, it is preferably 0.98 or less.

  Note that the maximum load of the board in this embodiment is the value when the load is applied to the surface of the board, and the water absorption test is performed by immersing the cut board in water for 5 minutes and measuring the weight before and after water absorption. It is the value which calculated | required the water absorption from the ratio. Since the board according to the present embodiment is blended with a board additive containing a grain seed part having a predetermined particle size, the effect of the grain seed part can easily achieve improvement in strength and water resistance. Can do.

The thickness of the wood material according to this embodiment is 3 to 100 mm. Preferably 5-30 mm It is preferable that In the present embodiment, the board having such a thickness has a more remarkable effect of enhancing strength and water resistance by blending the board additive.

  The board which concerns on this embodiment can be manufactured by a conventionally well-known method except mix | blending the board additive mentioned above. For example, first, a wood fiber slurry in which a wood material and the board additive are dispersed in water is prepared. The board additive may be added to the wood material before or after the wood fiber slurry is prepared. Here, the board additive may be added to the wood material such that the mass of the grain seed part relative to the total mass of the wood material and the grain seed part is 2 to 17% by mass in terms of dry solid content. preferable.

  If the obtained wood fiber slurry is poured into a wire, it is formed into a felt shape having a desired thickness (wire part). Here, the opening of the wire is preferably 106 μm to 2 mm, and particularly preferably 200 μm to 1 mm. By using such a wire, the grain seed part contained in the board additive and the wood material can be effectively entangled with each other.

  Next, the wood fiber slurry is dehydrated using a press or the like (press part), and then the residual moisture is sufficiently removed by drying by heating (dryer part) to obtain the board according to the present embodiment. The board thus obtained may be used as a single layer, or may be formed as a laminate of the boards and other layers.

  Since the board according to the present embodiment described above contains a board additive containing a grain seed part having a predetermined particle size, it is easy to produce and has enhanced strength and water resistance. Become.

  The embodiment described above is described for facilitating understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

  Hereinafter, although an example, a test example, etc. are shown and this invention is demonstrated still in detail, this invention is not limited to the following example, a test example, etc. at all.

[Test Example 1; Fixability Evaluation-1]
Preparation of hydrous barley The seed part of roasted barley (containing six-row barley and two-row barley) was immersed in 90 ° C. warm water at a ratio of roast barley: 90 ° C. warm water = 15 g: 1000 mL for 30 minutes. The mixture was filtered through a 2 mm sieve to obtain hydrous barley (water content: 80.5% by mass). The moisture content of the water-containing barley left on the mesh immediately after draining and after standing for 24 hours was measured with an infrared moisture meter (Kett Science Laboratory; FD-620). Table 1 shows the shape and moisture content of each hydrous barley.

  From Table 1, the moisture content changes greatly depending on the shape of the barley, but the moisture content does not change even if the hydrous barley is left for 24 hours. From the above, the water retention capacity (water content) of barley is 69% by mass to 82% by mass, and the water-containing barley used in the following Examples and Comparative Examples has an average water content of 76.6% by mass. did.

Production of hydrous barley (Production Example 1)
Water was added to the obtained hydrous barley (water content: 76.6% by mass) at a ratio of hydrous barley: water = 10 g: 60 g, and the mixture was put into a juicer mixer (MJ-W90, manufactured by National) for 3 minutes. Crushed. The obtained pulverized product was sieved using a sieve with openings of 2 mm, 1 mm, 500 μm and 240 μm while flowing water, board additive (sample 1) having a particle diameter of 2 to 1 mm, board having a particle diameter of 1 to 500 μm An additive (sample 2), a particle size of 500 to 250 μm (sample 3), and a particle size of 240 μm or less (sample 4) were obtained. In addition, unground hydrated barley (sample 5) was also obtained. Note that “particle size 2 to 1 mm” means that it passed through a sieve with an opening of 2 mm and did not pass through a sieve with an opening of 1 mm, and “particle size of 1 to 500 μm” means that it passed through a sieve with an opening of 1 mm. “A particle size of 500 μm to 250 μm” means that it did not pass through a sieve with an opening of 500 μm and did not pass through a sieve with an opening of 250 μm, and “a particle size of 240 μm or less”. Represents that it passed through a sieve having an opening of 240 μm.

Production of dried barley (Production Example 2)
Except that the hydrous barley (moisture content: 76.6% by mass) was dried at 105 ° C. for 24 hours and then put into a juicer mixer (MJ-W90, manufactured by National) and dry pulverized for 3 minutes. To obtain a pulverized product. A board additive having a particle diameter of 2 to 1 mm (sample 6), a board additive having a particle diameter of 1 to 500 μm (sample 7), a particle diameter of 500 to 250 μm (sample 8), and a particle diameter of 240 μm or less (sample 9). In addition, dry barley (sample 10) was obtained by drying unground hydrated barley at 105 ° C. for 24 hours.

Production of wood board (evaluation of fixability)
Add water to a commercially available insulation board (manufactured by Daiken Kogyo Co., Ltd.) and immerse in water for 5 minutes. Then, add it to a juicer mixer (manufactured by National, MJ-W90) and stir for 5 minutes. A slurry was obtained. In the obtained wood fiber slurry, the board additives of Samples 1 to 10 are blended so that the mass of barley relative to the total mass of the wood fiber slurry and barley becomes the blending amount shown in Table 2 in terms of dry solids, A wood fiber slurry containing barley (board additive) was prepared. The obtained wood fiber slurry was subdivided by 4 g by dry weight and poured onto a wire having an opening of 180 μm (sieve area: 0.018 m ² ) to prepare a 16 cm × 11 cm barley-containing wood fiber mat. The wood fiber mat (hydrous material) blended with barley was sandwiched between Kim Towel (manufactured by Nippon Paper Crecia Co., Ltd.) and dehydrated by applying a pressure of about 120 g / cm ² from above. Then, it dried at 105 degreeC for 24 hours, and prepared the wooden board which mix | blended barley. The condition at the time of preparation and drying of the wooden board was visually confirmed. The results are shown in Tables 2 and 3. Here, in the table, ◎ indicates that there is no problem in preparation (excellent), ○ indicates that preparation is possible (good), and × indicates that preparation is impossible (bad).

As shown in Table 2 and Table 3, the sample blended with unmilled hydrous barley (board additive) with a particle size of over 2 mm has a wooden board because Kim Towel and the barley tea bowl contained in the board are firmly attached. I couldn't. About the sample which mix | blended the unmilled dry barley whose particle size exceeds 2 mm, since the dry unmilled barley floats on the surface of the wood fiber slurry, the affinity (dispersibility) with the wood fiber slurry is poor, and thereafter It became impossible to produce such as barley detaching in the process.
On the other hand, barley having a particle size of 2 mm or less was generally excellent in fixability and papermaking, and barley having a particle size of 2 mm or less and more than 500 μm was excellent. In particular, it was clear that the board additive of hydrous barley was better than dry barley.

[Test Example 2: Strength evaluation]
Production of wood board (strength evaluation)
The wood board prepared in Test Example 1 cut to 2 cm × 3.5 cm × 3 mm is placed on a compression / tensile strength measuring device (manufactured by Imada Co., Ltd.), and the average deformation speed is 50 mm / min from the surface of the board. And the maximum load (kgf / mm) was measured. Furthermore, based on the obtained results, the ratio of the maximum load (b) of the barley-containing wood board to the maximum load (a) of the barley-free wood board is calculated, and when barley (board additive) is blended The intensity change was confirmed. The results are shown in Tables 4 and 5. The ratio of the maximum load of the barley blended board to the maximum load of the barley blended board was calculated. The case where b / a> 1.00 has a strength improving function was evaluated as ◯.

  It is shown that the wood board containing water-containing barley adjusted to a predetermined particle size has good strength, and the strength is improved as compared with the wood board without blending. In addition, for wood boards blended with dry barley, when the board additives of sample 6 (dry barley, particle size: more than 1 mm and less than 2 mm) and sample 7 (dry barley, particle size: more than 500 μm and less than 1 mm) are blended Strength improved. On the other hand, when the board additives of Sample 8 (dry barley, particle size: more than 250 μm and 500 μm or less) and Sample 9 (dry barley, particle size: 250 μm or less) were blended, variations in strength appeared. Since fine and light dried barley floats on the surface of the wood fiber slurry, it is considered that the affinity was deteriorated and the strength was varied.

[Test Example 3; Evaluation of water resistance]
Production of wood board (evaluation of water resistance)
The wood board prepared in Test Example 1 was cut into 2 cm × 3.5 cm × 3 mm and placed in a container together with 3 L of water and allowed to stand for 5 minutes (water absorption). The weights of the wooden board before water absorption and the wooden board after water absorption were measured. Furthermore, based on the obtained results, the water absorption rate (%) was calculated from the ratio of the weight (c) of the wood board before water absorption to the weight (d) of the wood board after water absorption (water absorption rate = c / d). × 100). The results are shown in Tables 6 and 7. A water absorption rate lower than that of the unblended wood board was rated as “good” as water resistance was improved.

  Wood boards containing water-containing barley are sample 1 (water-containing barley, particle size: more than 1 mm and less than 2 mm), sample 2 (water-containing barley, particle size: more than 500 μm and less than 1 mm) and sample 3 (water-containing barley, particle size: more than 250 μm). Water resistance was improved for those containing a predetermined amount of board additive of 500 μm or less. Moreover, the wood board which mix | blended dry barley is water-resistant about what mixed the board additive of sample 8 (dry barley, particle size: more than 250 micrometers 500 micrometers or less) and sample 9 (dry barley, particle diameter: 250 micrometers or less). Although the properties improved, those with other board additives blended in the water resistance and were not good.

  As mentioned above, the wood board which has intensity | strength and water resistance was able to be obtained by mix | blending a hydrous barley (board additive) with a particle size of 2 mm or less and more than 250 micrometers into a wood fiber slurry.

The board additive according to the present invention can enhance the strength and water resistance of the blended board and is less likely to be detached from the wood fiber slurry in the paper making process. In addition, by using the production residue of grain drinks such as barley tea, it is possible to effectively utilize unused resources. Furthermore, the board according to the present invention is easy to make and has enhanced strength and water resistance, and is suitable for residential building materials such as heat insulating materials and tatami core materials, medical building materials and mats, pet mats, etc. Particularly preferred.

Claims (6)

A board additive containing a barley seed part which is a manufacturing residue of a barley tea beverage and has a moisture content of 69 to 82 % by mass, wherein the barley seed part is defined in JIS Z8801-1: 2006 A board additive characterized by having a particle size that passes through a sieve having an opening of 2 mm and does not pass through a sieve having an opening of 200 μm as defined in JIS Z8801-1: 2006. It is a board containing the board additive of Claim 1, Comprising : The ratio of the mass of the barley seed part with respect to the total weight of a wooden material and a barley seed part in the said board is 3-15 mass% in conversion of dry solid content. A board characterized by a proportion. It is adjusted to a particle size that passes through a sieve having a nominal aperture of 2 mm specified in JIS Z8801-1: 2006 and does not pass through a sieve having an aperture of 200 μm specified in JIS Z8801-1: 2006, and the moisture content is 69 to 82 mass. %. A method for producing a board additive comprising blending a barley seed part which is a production residue of a wet barley tea beverage which is%. It is a manufacturing method of the board containing the board additive manufactured by the method of Claim 3, Comprising: In the said board, the ratio of the mass of the barley seed part with respect to the total weight of a woody material and a barley seed part is dry solid content. The board manufacturing method, wherein the board additive is blended so as to have a ratio of 3 to 15 % by mass in terms of conversion. The board additive according to claim 1 is blended with a wood material. A board additive according to claim 1 is mixed with a wooden material.