JP2019042932A - Particle board bamboo chip, and production method of particle board bamboo chip - Google Patents

Abstract

To provide particle board bamboo chips capable of producing a particle board free from mold, which contains bamboo chips exhibiting high strength as compared with conventional ones, and to provide a manufacturing method of the same.SOLUTION: A lactic acid bacteria-fermented metabolic product is contained therein. Further, according to a production method thereof, there is provided the method comprising: a crushing step of supplying logged bamboo to a crusher; a pulverization step of preparing a mixed and crushed product by supplying crushed pieces to the crusher; a fermentation step of increasing temperature of the mixed and crushed product deposited while being fermented by fermentative bacteria at least including lactic acid bacterium by depositing the mixed and crushed product in a fermentation yard; and a bamboo chip producing step of cutting through the deposited mixed and crushed product, followed by lowering the temperature, and drying to produce particle board bamboo chips having fine crimping.SELECTED DRAWING: None

Description

  The present invention relates to a particle board bamboo chip and a particle board bamboo chip manufacturing method.

  Particleboard is a plate-like product made by molding small pieces of wood fiber and other vegetable fibers (particles) together with a resin component for bonding, and heat pressing (hot-press forming) to a certain area and thickness. Notably, it is widely used as a building material in ground materials such as floors and walls in Asian countries including Korea and Taiwan.

  The wood-based particle board is a technology capable of effectively utilizing discarded wood pieces and wood fibers, and has advantages such as low anisotropy and excellent processability. However, in general, the wood-based particle board is not sufficient in strength as compared with a lumber board, and the dimensional change at the time of water absorption or at the time of moisture absorption / drying is large. In particular, with particle board using wood fibers such as MDF, sufficient strength can not be obtained easily, dimensional stability is insufficient, and there are problems such as warping depending on the use environment.

  On the other hand, with the increase of leaving bamboo forests in recent years, a method of effectively using bamboo as a resource is required, and various proposals have been made to use bamboo as a raw material of particle board.

  For example, Patent Document 1 discloses a bamboo fiber which is produced by steaming bamboo material in the presence of high-temperature high-pressure steam and defibrillating the steamed bamboo material under normal pressure and at a temperature exceeding normal temperature. It is disclosed that it is suitable for fiber boards such as particle board.

  Further, in Patent Document 2, a bamboo obtained by compression-molding a mixture obtained by adding a formaldehyde-based adhesive, a silane coupling agent and water to a bamboo chip and stirring and mixing it while heating to a predetermined temperature with a hot press. A method of making a particle board is disclosed.

JP, 2005-193405, A Patent No. 2502903

  By the way, bamboo is a herbaceous plant containing a relatively large amount of water, and there is a problem that bamboo after being harvested is susceptible to mold.

  Therefore, the above-described conventional bamboo particle board also has a problem that mold may be generated depending on the use environment.

  In addition, although bamboo is a material having extremely high strength in which vascular bundles are densely gathered, bamboo particles (hereinafter referred to as bamboo chips) and a resin binder are mixed to prepare a mixed material of bamboo particle board At that time, there is a problem that the impregnating property of the resin binder into bamboo chips is low, and it is difficult to make each bamboo chip itself function as a composite material.

  The present invention has been made in view of such circumstances, and provides a bamboo chip for particle board which is hard to be moldable and can manufacture a bamboo chip-containing particle board having high strength as compared with the prior art.

  In the present invention, a method of manufacturing bamboo chips for particle board which is hard to be moldy and can manufacture a bamboo chip-containing particle board having high strength as compared with the prior art, a bamboo chip-containing particle board, and a method of manufacturing bamboo chip-containing particle boards Also provide.

  In order to solve the above-mentioned conventional subject, in the bamboo chip for particle boards concerning the present invention, it decided to contain (1) lactic acid bacteria fermentation metabolite.

  In addition, the bamboo chip for particle board according to the present invention is also characterized in that (2) micro-constriction caused by heat-drying denaturation of soft cells is provided.

  Further, in the particle board according to the present invention, it is composed of (3) the heat and pressure molded material of the mixed raw material of the bamboo chip for particle board and the resin binder according to the above (1) or (2).

  In the particle board according to the present invention, at least 9 parts by weight of (4) 10 parts by weight of the bamboo chip for particle board are needle-like coarse fibers having a diameter of 3 mm to 10 mm and a length of 10 mm to 30 mm, and a diameter of 1 mm A fine powder of 1 to 7 mm in length and a weight ratio of the needle-like coarse fiber body to the fine powder fine-piece of 9: 1 to 6: 4; It is also characterized by having a three-layer structure including the formed intermediate layer and the decorative layer formed of the finely pulverized pieces on both sides of the intermediate layer.

  Further, in the method of manufacturing bamboo chips for particle board according to the present invention, (5) a crushing step of supplying cut down bamboo to a crusher and passing through a 50 mm square screen to make fragments of an average length of 10 to 30 mm A crushed mixture is subjected to a crusher, and is a mixed and pulverized material in which a needle-like coarse fiber body having a diameter of 3 mm to 10 mm and a length of 10 mm to 30 mm and a fine powder strip having a diameter of 1 mm to 5 mm and a length of 1 mm to 7 mm are mixed. The mixed and ground material is deposited in a fermentation yard in which ventilation equipment is installed on the floor surface, and the fermentation is performed at least including bamboo-derived lactic acid bacteria over 5 to 14 days while performing aeration and switching as necessary. A fermentation step of raising the temperature of the mixed and crushed material deposited while being fermented by bacteria, and a bamboo chip as a bamboo chip for particle board provided with a slight contraction by cutting down the mixed and crushed material that has been deposited and cooling and drying. It was decided to have the generation process .

  Further, in the method for producing a particle board according to the present invention, (6) a particle-like bamboo chip obtained by the method for producing a particle board bamboo chip according to (5) is classified to obtain needle-like coarse fibers and fine powder. In the separation step of separating into small pieces, the needle-like coarse fiber body mixed raw material preparation step of preparing the mixed raw material of the needle-like coarse fiber body by adding the resin binder to the needle-like coarse fiber body and mixing, A fine powder mixed material preparing step of preparing a mixed raw material of fine powder small pieces by adding and mixing a resin binder, a fine powder small fragment mixed raw material, an acicular coarse fiber material mixed raw material, a fine powder small piece in a mold of a predetermined shape And a particle board forming step of forming a particle board of a three-layer structure by laminating the mixed raw materials in order and heating while being pressurized in the lamination direction.

  According to the bamboo chip for particle board according to the present invention, the method for manufacturing bamboo chip for particle board, bamboo chip-containing particle board, and method for manufacturing bamboo chip-containing particle board Chip-containing particle boards can be manufactured.

  The present invention provides a bamboo chip for particle board which is resistant to mold and can manufacture a bamboo chip-containing particle board having high strength as compared with the prior art.

  In the present specification, the "particle board" refers to one which is molded and hot pressed with an adhesive agent, using as the main material particles (chips and the like) made of plant matter such as wood chips, in accordance with JIS A5908. In addition, particle boards include single-phase, three-layer and multi-layered ones.

  Adhesives used to form particle boards, that is, resin binders, are used to combine bamboo chips and chips made of other materials used as other raw materials, as well as components added to impart functionality to particle boards, etc. It will not be specifically limited if it can hold | maintain, It is possible to select suitably the resin component used for a conventionally well-known adhesive agent according to the intended purpose of a particle board. For example, phenol resin type (P type), urea-melamine co-condensation resin type (M type), urea resin type (U type), melamine resin, isocyanate type resin, acrylic type emulsion specified by standard standard (JIS A5908) Adhesives, SBR-based emulsion adhesives, vinyl acetate-based emulsion adhesives, aqueous vinyl urethane adhesives and the like can be mentioned.

  The ratio of the resin binder may be any ratio as long as bamboo chips and other raw materials added according to need have adhesive strength that can be used as particle board, and usually 5 to 20 with respect to the total weight of bamboo chips etc. It can be in weight percent.

  In addition, functional components other than bamboo chips can be added in order to impart new functionality to the particle board. As such functional components, for example, flame retardants, preservatives, fungicides and the like can be exemplified.

  Further, the shape and size of the particle board to be formed may be, for example, in the range of 9 mm to 20 mm in thickness, 900 mm to 1210 mm in width, and 1820 mm to 2730 mm in length according to the standard (JIS A5908) etc. However, there is no particular limitation.

  When the particle board is formed of a plurality of layers, for example, three layers of a decorative layer, an intermediate layer and a decorative layer, the thickness of each layer is not particularly limited. For example, the decorative layer is 1 mm to 5 mm, and the intermediate layer is 8 mm It can be ~ 19 mm.

  When the particle board is formed of multiple layers, another functional layer may be formed between each layer. As such a functional layer, an adhesive layer, a heat insulation layer, a sound insulation layer etc. are mentioned, for example.

  In the production of particle boards, bamboo chips can be used to make harvested bamboo into a crusher or further to a crusher to make it finer. Although the size of this bamboo chip is not particularly limited, for example, a needle-like coarse fiber body having a diameter of 3 mm to 10 mm and a length of 10 mm to 30 mm, or a fine powder having a diameter of 1 mm to 5 mm and a length of 1 mm to 7 mm It is preferable to use those which are in the form of small pieces, and further in which these needle-like coarse fibers and fine powder pieces are in a mixed state.

  And, it can be said that the bamboo chip for particle board according to the present invention is characterized in that it contains lactic acid bacteria fermentation metabolite. By incorporating lactic acid bacteria fermentation metabolite into bamboo chip, the lactic acid contained in the lactic acid bacterium fermentation metabolite acidifies the bamboo chip itself, and, similarly, the antibacterial component contained in the lactic acid bacterium fermentation metabolite makes the bamboo chip The occurrence of mold can be effectively suppressed.

  In addition, by making the bamboo chip itself acidic, the curing speed of the resin binder is improved, and the bamboo chip and the resin binder are mixed, and the mixed material of bamboo particle board (hereinafter, also simply referred to as mixed material) is a plate. It is possible to shorten the time for solidifying into a shape. In addition, when the bamboo chip becomes acidic, a part of the tissue constituting the bamboo chip is softened, the resin binder can easily penetrate and the bamboo chip itself functions as a complex with the resin binder, and particle board The strength can be further improved.

  The lactic acid bacteria producing the lactic acid bacteria fermentation metabolite are not particularly limited, but it is desirable that they are bamboo-derived lactic acid bacteria, particularly lactic acid bacteria that are permanently present in bamboo that is a raw material of bamboo chips. The lactic acid bacteria that are always present in the raw material bamboo often acquire means to counter the mold that occurs in the bamboo, and a more efficient antifungal effect can be expected.

  In addition, the bamboo chip may be provided with a fine crimp produced by heat-drying denaturation of soft cells constituting the bamboo chip. Specifically, as shown in FIG. 1, it is a hairy structure in which a part of the parenchyma is curled, and by the bamboo chip being provided with this slight contraction, mutual entanglement is promoted, and the bamboo chip is firmly bonded to each other. It is possible to increase the strength of the particle board derived from

  The method for containing the lactic acid bacteria fermentation metabolite in the bamboo chip is not particularly limited, and a method of sprinkling the lactic acid bacteria fermentation liquid on the bamboo chip or immersing the bamboo chip in the lactic acid bacteria fermentation liquid is exemplified. Among them, a method of fermenting bamboo chip itself with lactic acid bacteria is preferable.

  In the manufacturing method of the bamboo chip for particle boards which especially concerns on this embodiment, it is supposed that the bamboo chip containing a lactic-acid-bacteria fermentation metabolite is obtained by fermenting bamboo chip itself.

  Specifically, the harvested bamboo is supplied to a crusher and passed through a 50 mm square screen to form crushed pieces of an average length of 10 to 30 mm, and the crushed pieces are subjected to a crusher, and the diameter is 3 mm to 10 mm Grinding process to prepare a mixed and ground material consisting of a mixture of needle-like coarse fibers with a length of 10 mm to 30 mm and fine powder fragments with a diameter of 1 mm to 5 mm and a length of 1 mm to 7 mm; The mixed crushed material is deposited in the laid fermentation yard and, while being aerated and switched back as necessary, the mixed crushed material deposited while being fermented by a fermenting bacterium containing at least a bamboo-derived lactic acid bacterium for 5 to 14 days It has a fermentation step of raising the temperature, and a bamboo chip producing step of breaking down the deposited mixed pulverized material, lowering the temperature and drying it, and making it into a bamboo chip for particle board provided with a slight crimp.

  The crushing step is a step for crushing bamboo after felling, and the bamboo is used for a crushing machine to generate fragments of about 10 to 30 mm. This crushing process is a pretreatment process for supplying bamboo to the crushing process to be described next, and can be omitted as long as bamboo after felling can be directly supplied to the crusher used in the crushing process .

  The crushing step is a step for providing a crushed piece of bamboo by using a crushed piece of bamboo (a bamboo after harvesting if the crushing step is omitted) to a crushing machine. The size of the ground material of this bamboo is not particularly limited, but in the method for producing a bamboo chip for particle board according to this embodiment, it is obtained as a mixed and ground material of needle-like coarse fiber body and fine powder fragments. The size of each needle-like coarse fiber body is 3 mm to 10 mm in diameter and 10 mm to 30 mm in length, more preferably 15 mm to 25 mm in length, and 1 mm to 5 mm in diameter of fine powder fragments The standard is about 7 mm.

  A fermentation process is a process for fermenting the obtained ground material with the fermentation microbe containing lactic acid bacteria, and making a ground material contain a lactic acid bacteria fermentation metabolite. The fermented bacteria used in the present fermentation step may be at least a bacterial flora containing lactic acid bacteria, preferably a bacterial flora containing lactic acid bacteria derived from raw material bamboo, and the lactic acid bacteria predominately grow during a predetermined period during fermentation and the crushed material It is not particularly limited as long as it contains a lactic acid bacteria fermentation metabolite to the extent that it is acidic.

  Fermented bacteria containing lactic acid bacteria may be added as a starter to the crushed product as the fermented bacteria culture solution obtained by separately culturing, but conveniently, the resident bacteria originally adhering to bamboo Can also be used. That is, the crushed material may be deposited and naturally fermented. In this case, the water content of the pulverized material can be 25 to 70% by weight.

  The fermentation time can be adjusted, for example, between 5 and 14 days through the four seasons if outdoors. Specifically, about 10 g of the pulverized material subjected to the fermentation step may be dispersed in 100 ml of water, and the value when measuring the pH of the supernatant may be 4.0 to 4.5.

  In addition, during the fermentation, it is preferable to appropriately ventilate or switch back. If the place where the crushed material is deposited is a fermentation yard in which ventilation equipment is installed, ventilation and switching can be easily performed.

  In addition, during fermentation, it is desirable to maintain the temperature inside the deposited pulverized material at a temperature as high as possible without exceeding 60 ° C. By maintaining such a state, stable fermentation can be performed relatively quickly, and bamboo parenchyma can be denatured to promote the formation of a fine crimp. If the temperature exceeds 60 ° C., the air may be ventilated or switched back, or the oxygen supply may be cut off to promote a temperature drop.

  The indication of the completion of fermentation can be a state accompanied by a lactic acid bacteria fermentation odor at a pH of the fermented product of 4.0 to 4.5 and a water content of 15 to 35% by weight. The fermentation process may be performed after the crushing process, or may be performed after the crushing process and then subjected to the crushing process.

  The crushed material in the deposited state after the fermentation process is cut and crushed sequentially, and can be made into a bamboo chip for particle board containing lactic acid bacteria fermentation metabolite by lowering temperature and drying. At this point of time, moisture is evaporated by contact with the heat of fermentation or with the atmosphere to perform appropriate drying, and a fine constriction is formed in the pulverized product due to degeneration of the parenchyma cells.

  Thus, in the particle board bamboo chip containing lactic acid bacteria fermentation metabolite, for example, the particle board bamboo chip prepared according to the method described above, lactic acid and lactic acid bacteria produced by fermentation of lactic acid bacteria are fermented Repellent components that are secreted to eliminate other microorganisms to grow predominantly in the flora, and many of the relatively simple carbon sources are consumed by the growth of the complex flora, and microbial nutrition is poor. It is possible to effectively suppress the generation of mold on the particle board bamboo chip by various effects of the fermentation acting in a combined manner, for example, in a state of being stable.

  The present specification also provides a particle board formed by heating and pressing a mixed material of a bamboo chip for particle board and a resin binder according to the present embodiment, and a method of manufacturing the particle board.

  In the particle board according to the present embodiment, since the lactic acid bacteria fermentation metabolite is contained in the bamboo chip, it is possible to effectively suppress the occurrence of mold as described above. In particular, since this antifungal effect is sustained continuously after formation of particle board, for example, while actually being used as a building material, it is extremely compatible with the relatively wet Japanese climate throughout the four seasons. I can say that.

  In addition, with the presence of lactic acid and the assimilation of carbon sources by microorganisms, the state of the structure of bamboo chip for particle board is in a state in which the resin binder is more likely to penetrate to the inside compared with before treatment. When the chip is mixed with a resin binder to prepare a mixed raw material, the resin binder efficiently penetrates the bamboo chip, and the bamboo chip itself becomes a composite material with the resin, whereby the strength of the particle board can be further improved.

  Furthermore, if bamboo chips are provided with micro-winding, entanglement between bamboo chips is promoted, and it is possible to achieve high strength of particle board derived from strong bonding between bamboo chips.

  Further, the method of manufacturing a particle board according to the present embodiment provides, in particular, a method of manufacturing a particle board having a three-layer structure.

  Specifically, the separation step of classifying the bamboo chip for particle board obtained by the method of manufacturing bamboo chip for particle board according to the present embodiment and separating it into a needle-like coarse fiber body and a fine powder particle, A resin binder is added to the fiber body and mixed to prepare a mixed raw material of a needle-like coarse fiber body and a needle-like coarse fiber body mixed raw material preparing step, a resin binder is added to fine powder pieces and mixed, and a mixture of fine powder pieces Step of preparing the raw material The step of preparing the raw material mixed powder raw material fine powder mixed raw material, needle-like coarse fiber body mixed raw material, raw powder fine particle mixed raw material in the form of the predetermined shape And forming a particle board having a three-layer structure by heating while forming a particle board.

  The mixing of each bamboo chip and resin binder in the needle-like coarse fiber body mixed raw material preparation step and the fine powder small piece mixed raw material preparation step is carried out by charging the bamboo chip into a known mixer and becoming uniform with a predetermined amount of resin binder It does by mixing.

  In the particle board forming step, first, the needle-like coarse fiber material mixture raw material and the fine powder fine-piece mixture raw material separately obtained are mixed in a mold frame with the fine powder fine-piece mixture raw material, the needle-like coarse fiber material raw material, the fine powder fine material The single-piece mixed material is stacked and accommodated in order, and is temporarily formed into a plate of a predetermined size.

  Next, the temporarily formed plate-like body is placed in a known heating press, and pressing (thermal pressure forming) is performed while heating from the stacking direction (front and back direction of the plate-like body) to obtain a particle board with a three-layer structure. Manufactured.

In addition, the method of a heating press is arbitrary, and it can be set as a continuous press and a multistage press as needed. The conditions of the heating press are appropriately determined in consideration of the type and mixing ratio of the components to be used, the strength and weight of the target particle board, and the like. For example, the heating temperature may be about 150 to 250 ° C., the pressing pressure may be about 1 to 15 N / mm ² , and the pressing time may be about 20 to 40 seconds per 1 mm thickness of the target particle board.

  Further, the particle board obtained may be cured after being cut to a size of a predetermined standard, and sanded to smooth the surface.

  The particle board bamboo chip, the particle board bamboo chip manufacturing method, the particle board, and the particle board manufacturing method according to the present embodiment will be further described while following the manufacturing procedure.

[1. Formation of fragments]
A crushing process is carried out by using the moso bamboo cut down to a crusher (Dragon chipper JK 216 manufactured by Shandong Machinery Manufacturing Co., Ltd.) fitted with a screen of 30 mm to 50 mm, and 10 mm to 100 mm long and 10 mm to 50 mm wide and thickness Crushed pieces (about 500 kg) of about 3 mm to 10 mm were obtained.

[2. Formation of mixed pulverized material]
The crushed pieces obtained in the crushing step are subjected to a grinding process by using a crusher, and a needle-like coarse fiber body with a diameter of 3 mm to 10 mm and a length of 10 mm to 30 mm and a fine powder of 1 mm to 5 mm in diameter and 1 mm to 7 mm in length A mixed and pulverized material (about 500 kg) was obtained in which small pieces were mixed.

[3. Fermentation treatment and production of bamboo chips]
In the fermentation yard in which ventilation equipment was laid on the floor, about 500 kg of the mixed and ground material obtained in the crushing step is deposited to a height of about 1 m, and the fermentation process is carried out by lactic acid bacteria and other attached bacteria that are permanently present in the raw material bamboo. Did.

  Specifically, water was added to the deposited mixed pulverized material to adjust the water content to about 25 to 70% by weight, and fermentation was carried out at an air temperature of about 18 to 25 ° C. for 7 days.

  The temperature of the mixed pulverized material deposited was about 23 to 28 ° C, which was not much different from the environmental temperature on the first day, but the temperature rose to about 38 ° C from the second day and reached 53 ° C on the third day It reached to.

  On the fourth day, when the temperature reached 59 ° C., aeration of the deposited mixed grind was performed using a fermentation yard ventilating facility to promote oxygen supply and temperature drop. In addition, on the fifth day when the temperature reached 58 ° C., the mixed pulverized material deposited using a heavy machine was switched back in order to cause uniform fermentation.

  The measurement of the degree of acidity was performed on the second day, the fourth day, and the seventh day. In the measurement method, 10 g of the mixed pulverized material was placed in a 200 ml volume beaker, 100 ml of water was added and dispersed sufficiently, and the supernatant was measured with a pH meter. As a result, the pH at day 2 was 5.7, and the pH at day 4 was 5.2. In addition, on the seventh day, the pH reached 4.0 to 4.5, and it was judged that the fermentation process should be ended.

  The deposited mixed crushed material was cut down, and brought into contact with the air sufficiently to lower the temperature and to dry to obtain a bamboo chip for particle board (bamboo chip producing step).

  As a result of observing the obtained bamboo chip with a microscope, it was confirmed that the fine contraction caused by the degeneration of parenchyma was detected in any of the bamboo chips collected as a sample.

  In addition, the antifungal property of bamboo chip for particle board was confirmed. A bamboo chip for particle board was placed on a dextrose agar medium, and Aspergillus niger and Penicillium citrinum were inoculated and cultured at 30 ° C. for 48 hours. Moreover, it tested similarly about the mixed grinding material which is not used for a fermentation process as a comparison control. As a result, in the case of the bamboo chip for particle board according to the present embodiment, the growth of mold was not recognized including the periphery of the bamboo chip. On the other hand, in the control group, the occurrence of mold was observed up to the mixed and crushed material itself.

[4. Classification process]
Next, 300 kg of bamboo chip for particle board that has undergone fermentation treatment is used as a sieve, and needle-like coarse fibers with a diameter of 3 mm to 10 mm and a length of 10 mm to 30 mm, and fine powder with a diameter of 1 mm to 5 mm and a length of 1 mm to 7 mm It was separated into pieces (separation step). As a result of separation, the needle-like coarse fiber was about 70% by weight (about 210 kg), and the fine powder was about 30% by weight (about 90 kg).

[5. Preparation of mixed raw material]
The needle-like coarse fiber body is charged into a mixer (groove renderer), and the urea-melamine resin adhesive corresponding to 20 to 25% by weight of the needle-like coarse fiber body is charged with PB-100 made by DIC Corporation The mixture was added as a binder and mixed sufficiently to prepare a needle-like coarse fiber body mixed raw material (needle-like coarse fiber body mixed raw material preparation step).

  Also, in parallel with this, fine powder fine pieces are charged into the groove renderer, PB-100 equivalent to 20 to 25% by weight of the charged needle-like coarse fiber body is added as a resin binder and sufficiently mixed to make fine powder fines. A piece mixed raw material was prepared (fine powder piece mixed raw material preparation step).

[6. Formation process]
Next, in order to manufacture a standard product of so-called 3 × 8 size (910 × 2430 mm) with a setting thickness after pressing of 12 mm, a needle-like coarse fiber material mixture raw material and a fine powder fine particle mixture raw material were prepared .

  In a 3 × 8 size mold frame, first, the finely divided powder material mixture is spread evenly and disposed to form a temporary cosmetic layer on one side, and then a needle-like coarse fiber material mixture material is stacked on the temporary cosmetic layer on the first surface. The temporary intermediate layer is formed by spreading uniformly, and further, the fine powder fine particle mixed raw material is overlapped on the intermediate layer and uniformly spread to form the temporary decorative layer on the other side, thereby temporarily forming the particle board The formation of the forming board was performed.

  Next, the formed 12 temporary forming boards are inserted into a heating multistage press, pressure-heated and formed at a load of 1200 t for 7 to 9 minutes at 150 to 170 ° C., and removed from the heating multistage press A particle board having a three-layer structure was obtained (particle board forming step).

[7. Mold test]
Next, an antifungal test was conducted using the particle board according to the present embodiment as a sample. In the test, a particle board of 12 mm in thickness was cut into a length of 30 mm and a width of 30 mm to make a sample piece, and it was carried out in the same manner as the above-mentioned test of mildew resistance of bamboo chip. In addition, as a comparison control, a comparison control sample piece was similarly prepared using a particle board formed of a pulverized material not subjected to fermentation treatment, and subjected to a test.

  As a result, in the particle board according to the present embodiment, no growth of mold was found including the periphery. On the other hand, in the control sample, occurrence of mold was observed up to the sample itself.

  From these results, it was confirmed that the particle board according to the present embodiment has mold resistance compared to the conventional particle board containing bamboo chips.

[8. Strength test〕
Next, a strength test of the particle board according to the present embodiment was performed. A particle board of 12 mm in thickness was cut into a rectangular shape of 150 mm in length and 50 mm in width to make a sample piece, and a strength test was conducted by a method according to the JIS standard. In addition, as a comparison control, a comparison control sample piece was similarly prepared using a particle board formed of a pulverized material not subjected to fermentation treatment, and subjected to a test.

  As a result, the strength of the particle board according to the present embodiment was higher than the strength of the particle board as the comparison control.

  From these results, it was confirmed that the particle board according to the present embodiment has higher strength than a particle board including a conventional bamboo chip.

  As described above, according to the bamboo chip for particle board according to the present embodiment, since the lactic acid bacteria fermentation metabolite is contained, it is difficult to be moldy and manufactures a bamboo chip-containing particle board having high strength as compared to the prior art. be able to.

  Finally, the description of each of the above-described embodiments is an example of the present invention, and the present invention is not limited to the above-described embodiments. For this reason, even if it is a range which does not deviate from the technical idea concerning the present invention even if it is other than each embodiment mentioned above, it is needless to say that various change is possible according to a design etc.

  For example, in the above-described embodiment, all the chips used for the particle board are formed of bamboo, that is, they are formed of the bamboo chip for particle board according to the present embodiment, but the present invention is not limited thereto. Of course, the particle board may be formed by mixing it with the above-mentioned chip.

Claims (6)

  Bamboo chip for particle board containing lactic acid bacteria fermentation metabolite.   The bamboo chip for particle board according to claim 1, characterized in that it comprises micro-winding caused by heat-drying denaturation of soft cells.   The particle board which consists of a heating-pressing molding of the mixing raw material of the bamboo chip for particle boards and resin binder of Claim 1 or Claim 2.   Needle-like coarse fibers of at least 9 parts by weight of 10 to 30 parts by weight of 10 to 30 parts by weight of the bamboo chip for particle board, and fine powder strips of 1 to 5 mm in diameter and 1 to 7 mm in length A weight ratio of the needle-like coarse fiber body to the fine powder fragments is 9: 1 to 6: 4, and an intermediate layer formed of the needle-like coarse fiber body, and both front and back sides of the intermediate layer The particle board according to claim 3, wherein the particle board has a three-layer structure comprising a decorative layer formed of the finely pulverized pieces. Crushing process in which harvested bamboo is supplied to a crusher to make a 30 mm to 50 mm square screen into pieces having an average length of 10 to 30 mm,
The crushed pieces are subjected to a crusher to prepare a mixed and pulverized material in which a needle-like coarse fiber body having a diameter of 3 mm to 10 mm and a length of 10 mm to 30 mm and a fine powder strip having a diameter of 1 mm to 5 mm and a length of 1 mm to 7 mm are mixed. Grinding process,
The mixed and ground material is deposited in a fermentation yard in which ventilation equipment is installed on the floor, and is deposited while being fermented by a fermentation bacterium containing at least lactic acid bacteria derived from bamboo for 5 to 14 days while aeration and switching as necessary. A fermentation step of raising the temperature of the mixed pulverized material;
A bamboo chip producing step of cutting down the mixed and crushed material deposited, lowering the temperature and drying, and making it into a bamboo chip for particle board provided with a slight crimp;
A method of manufacturing a bamboo chip for particle board characterized by having: A separation step of classifying the bamboo chip for particle board obtained by the method of manufacturing bamboo chip for particle board according to claim 5 and separating it into a needle-like coarse fiber body and fine powder pieces;
A needle-like coarse fiber body mixed raw material preparation step of preparing a mixed raw material of the needle-like coarse fiber body by adding a resin binder to the needle-like coarse fiber body and mixing them;
A fine powder mixed material preparation step of adding a resin binder to the fine powder pieces and mixing them to prepare a mixed material of the fine powder pieces;
In the formwork of a predetermined shape, fine powder scrap mixed raw material, needle-like coarse fiber mixed raw material, fine powder scrap mixed raw material are laminated in order and heated while pressing in the laminating direction to form a particle board of three-layer structure Particle board forming process,
A manufacturing method of a particle board characterized by having.