JP6027489B2 - Manufacturing method of wood fiberboard - Google Patents
Manufacturing method of wood fiberboard Download PDFInfo
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Description
本発明は、木質繊維板の製造方法に関する。 The present invention relates to a method for manufacturing a wood fiber board.
従来より、住宅などの室内の壁材として、透湿性を有する木質繊維板が用いられている。 Conventionally, a wood fiber board having moisture permeability has been used as a wall material in a room such as a house.
木質繊維板の製造方法としては、例えば、搬送コンベア上の木質繊維に粉末樹脂を供給し、回転する解繊シリンダー（針付きロール）で解繊して繊維マットを製造し、この繊維マットを熱圧成形して木質繊維板を製造する方法が知られている（特許文献１、２）。 As a method for producing a wood fiber board, for example, a powder resin is supplied to wood fibers on a conveyor, and a fiber mat is produced by defibrating with a rotating defibrating cylinder (roll with a needle). A method for producing a wood fiber board by pressure molding is known (Patent Documents 1 and 2).
しかしながら、特許文献１、２のような従来の方法の場合、木質繊維に供給された粉末樹脂の一部が、解繊シリンダーによる解繊の際に遠心力で周囲に飛散してしまう場合がある。この場合、飛散した粉末樹脂は、繊維マットを製造する工程で利用することが難しいため、材料のロスが避けられないという問題がある。 However, in the case of the conventional methods such as Patent Documents 1 and 2, a part of the powder resin supplied to the wood fiber may be scattered around by centrifugal force during defibration by the defibrating cylinder. . In this case, since the scattered powder resin is difficult to use in the process of manufacturing the fiber mat, there is a problem that material loss cannot be avoided.
本発明は、以上のとおりの事情に鑑みてなされたものであり、木質繊維板の材料となる木質繊維と粉末樹脂とを解繊して繊維マットを製造する際に、飛散する粉末樹脂のロスを抑制することができる木質繊維板の製造方法を提供することを課題としている。 The present invention has been made in view of the circumstances as described above, and the loss of powder resin that scatters when a fiber mat is manufactured by defibrating wood fiber and powder resin, which are the materials of the wood fiber board. It is an object of the present invention to provide a method for manufacturing a wood fiber board capable of suppressing the above-described problem.
上記の課題を解決するために、本発明の木質繊維板の製造方法は、以下の工程、木質繊維の上に、樹脂供給部から粉末樹脂を供給して積層体を形成する積層工程、前記積層体を解繊シリンダーで解繊して繊維マットを得る解繊工程、および前記繊維マットを、熱圧成形して木質繊維板を製造する成形工程を含む木質繊維板の製造方法であって、前記解繊シリンダーは、内部に吸引手段を備え、かつ、表面には内部へ通じる複数の小孔を備えており、前記積層体の解繊によって飛散した前記粉末樹脂を、前記解繊シリンダーの前記吸引手段によって内部に吸引回収して、前記樹脂供給部に再投入することを特徴としている。 In order to solve the above-described problems, a method for producing a wood fiber board of the present invention includes the following steps, a laminate step of supplying a powder resin from a resin supply unit on a wood fiber to form a laminate, and the laminate A method for producing a wood fiber board, comprising a defibrating step of defibrating a body with a defibrating cylinder to obtain a fiber mat, and a molding step of producing a wood fiber board by hot pressing the fiber mat, The defibrating cylinder has suction means inside, and has a plurality of small holes leading to the inside on the surface, and the suction of the powder resin scattered by defibration of the laminated body to the suction of the defibrating cylinder It is characterized in that it is sucked and collected inside by means and re-introduced into the resin supply section.
この木質繊維板の製造方法では、前記解繊工程において、除湿した空気を供給することが好ましい。 In this wood fiber board manufacturing method, it is preferable to supply dehumidified air in the defibrating step.
この木質繊維板の製造方法では、前記積層工程における前記木質繊維層には、液状物が含まれていることが特に好ましい。 In this wood fiber board manufacturing method, it is particularly preferable that the wood fiber layer in the laminating step contains a liquid material.
本発明の木質繊維板の製造方法によれば、木質繊維板の材料となる木質繊維と粉末樹脂とを解繊して繊維マットを製造する際に、飛散する粉末樹脂のロスを抑制することができる。 According to the method for producing a wood fiber board of the present invention, when a fiber mat is produced by defibrating wood fibers and a powder resin, which are materials of the wood fiber board, the loss of the scattered powder resin can be suppressed. it can.
図１は、本発明の木質繊維板の製造方法の一実施形態を例示した概要図である。以下、図１とともに、本発明の木質繊維板の製造方法の一実施形態について説明する。 FIG. 1 is a schematic view illustrating an embodiment of a method for producing a wood fiber board of the present invention. Hereinafter, one embodiment of the method for producing a wood fiber board of the present invention will be described with reference to FIG.
本発明の木質繊維板の製造方法は、以下の工程を含んでいる。 The manufacturing method of the wood fiber board of this invention includes the following processes.
（１）木質繊維の上に、樹脂供給部から粉末樹脂を供給して積層体を形成する積層工程。 (1) A lamination process in which a powder resin is supplied from a resin supply unit on a wood fiber to form a laminate.
（２）前記積層体を解繊シリンダーで解繊して繊維マットを得る解繊工程。 (2) A defibrating step of defibrating the laminate with a defibrating cylinder to obtain a fiber mat.
（３）前記繊維マットを、熱圧成形して木質繊維板を製造する成形工程。 (3) A molding step for producing a wood fiber board by hot-press molding the fiber mat.
積層工程では、木質繊維１の上に、樹脂供給部Ｄ２から粉末樹脂２を供給して、木質繊維１の上に粉末樹脂２が積層した積層体３を形成する。 In the laminating step, the powder resin 2 is supplied from the resin supply unit D2 on the wood fiber 1, and the laminate 3 in which the powder resin 2 is laminated on the wood fiber 1 is formed.
具体的には、上流の繊維供給部Ｄ１から搬送コンベアＣ上に木質繊維１を供給する。供給された木質繊維１は、繊維束が搬送方向と同方向となるように配向していてもよい。 Specifically, the wood fiber 1 is supplied onto the conveyor C from the upstream fiber supply unit D1. The supplied wood fiber 1 may be oriented so that the fiber bundle is in the same direction as the transport direction.
繊維供給部Ｄ１から供給される木質繊維１としては、例えば、ケナフ、ジュートなどの麻類の靭皮繊維などを例示することができる。なかでも、麻類の靭皮繊維は、結晶性で強度の高いセルロースを多く含有し、繊維としての強度が高いため好ましい。麻類の靭皮繊維は、例えば、レッティングと呼ばれる浸水処理および物理的な解繊処理により、麻類の植物から長繊維を得ることができる。 Examples of the wood fiber 1 supplied from the fiber supply unit D1 include hemp bast fibers such as kenaf and jute. Among these, hemp bast fibers are preferable because they contain a large amount of crystalline and high strength cellulose and have high strength as fibers. Hemp bast fibers can obtain long fibers from a hemp plant by, for example, a soaking process called letting and a physical defibrating process.
木質繊維１は、例えば、長さ10〜200mm、直径100μm以下の長繊維であることが好ましく、長繊維を使用することで、長繊維同士を良く絡み合わせることにより繊維マットの形状保持性を高めることができる。また、木質繊維１は、水中に浸漬して接着成分を除去する前処理が行われたものであってもよい。 The wood fiber 1 is preferably, for example, a long fiber having a length of 10 to 200 mm and a diameter of 100 μm or less. By using the long fiber, the shape retention of the fiber mat is improved by entwining the long fibers well. be able to. Moreover, the wood fiber 1 may be subjected to a pretreatment that is immersed in water to remove the adhesive component.
続いて、繊維供給部Ｄ１の下流に配置された樹脂供給部Ｄ２から、木質繊維１の上に粉末樹脂２を均一に供給して積層させ、積層体３を形成する。 Subsequently, the powder resin 2 is uniformly supplied and laminated on the wood fiber 1 from the resin supply part D2 disposed downstream of the fiber supply part D1, and the laminate 3 is formed.
粉末樹脂２は、熱硬化性を有するものであり、例えば、酢酸ビニル樹脂、アクリル樹脂、エポキシ樹脂、ウレタン樹脂、ユリア樹脂、メラミン樹脂、フェノール樹脂などを粉末化したものを例示することができる。 The powder resin 2 has thermosetting properties, and examples thereof include a powdered vinyl acetate resin, acrylic resin, epoxy resin, urethane resin, urea resin, melamine resin, phenol resin, and the like.
そして、積層工程において供給する粉末樹脂２の量は、木質繊維板の強度、厚み、密度などを考慮して設定することができる。 And the quantity of the powder resin 2 supplied in a lamination process can be set in consideration of the intensity | strength, thickness, density, etc. of a wood fiber board.
また、積層工程における木質繊維１には、水、アルコールなどの液状物が含まれていることが好ましい。この場合、木質繊維１に予め液状物を混合し、液状物を含む木質繊維１を供給することができる。また、木質繊維１を供給した後、上方から液状物を散布して木質繊維１に液状物を含有させることもできる。 Moreover, it is preferable that liquid materials, such as water and alcohol, are contained in the wood fiber 1 in a lamination process. In this case, a liquid material can be mixed with the wood fiber 1 in advance, and the wood fiber 1 containing the liquid material can be supplied. Moreover, after supplying the wood fiber 1, the liquid material can be contained in the wood fiber 1 by spraying the liquid material from above.
そして、積層工程で形成した積層体３を解繊シリンダーＳを収納した混合部Ｍへ搬送する。 And the laminated body 3 formed at the lamination process is conveyed to the mixing part M in which the defibrating cylinder S was accommodated.
解繊工程では、積層工程で形成された積層体３を解繊シリンダーＳで解繊して繊維マット４を製造する。 In the defibrating process, the laminated body 3 formed in the laminating process is defibrated by the defibrating cylinder S to produce the fiber mat 4.
解繊シリンダーＳの表面には、木質繊維１を解繊するための針（突起）が形成されているとともに、内部へ通じる複数の小孔を備えている。解繊シリンダーＳの表面の小孔は、例えば、パンチングメタルやメッシュなどによって形成することができる。また、解繊シリンダーＳの内部には、吸引手段Ｆを備えている。吸引手段Ｆは、特に限定されないが、例えば、ファンなどの公知の手段を例示することができる。 On the surface of the defibrating cylinder S, needles (protrusions) for defibrating the wood fiber 1 are formed and provided with a plurality of small holes leading to the inside. The small holes on the surface of the defibrating cylinder S can be formed by, for example, punching metal or mesh. Further, suction means F is provided inside the defibrating cylinder S. Although the suction means F is not specifically limited, For example, well-known means, such as a fan, can be illustrated.
また、解繊シリンダーＳの手前には、押さえロールＲが配設されている。搬送コンベアＣで搬送された積層体３は、押さえロールＲによって押さえられながら高速回転する解繊シリンダーＳによって回転方向に引き離され、引き離された木質繊維１と粉末樹脂２は、混合部Ｍ内に飛散する。そして、この飛散により混合された木質繊維１と粉末樹脂２の集合体を、例えば下流の搬送コンベアＣ上で積み重ねることで繊維マット４を得ることができる。 In addition, a pressing roll R is disposed in front of the defibrating cylinder S. The laminate 3 transported by the transport conveyor C is pulled away in the rotation direction by the defibrating cylinder S that is rotated at a high speed while being pressed by the pressing roll R, and the separated wood fiber 1 and the powder resin 2 are mixed in the mixing unit M. Scatter. And the fiber mat 4 can be obtained by stacking the aggregate | assembly of the wood fiber 1 and the powder resin 2 which were mixed by this scattering, for example on the conveyance conveyor C downstream.
積層工程で形成された積層体３は、解繊工程での解繊の際に、粉末樹脂２が遠心力で周囲に飛散する。この際、積層体３の解繊によって飛散した粉末樹脂２は、解繊シリンダーＳの吸引手段Ｆによって内部に吸引回収され、再供給流路Ｗを通じて樹脂供給部Ｄ２に再投入される。このため、解繊工程での粉末樹脂２のロスが抑制され、効率的に繊維マット４を得ることができる。 In the laminated body 3 formed in the laminating process, the powder resin 2 is scattered around by centrifugal force during defibrating in the defibrating process. At this time, the powder resin 2 scattered by the defibration of the laminated body 3 is sucked and collected inside by the suction means F of the defibrating cylinder S and is reintroduced into the resin supply part D2 through the resupply channel W. For this reason, the loss of the powder resin 2 in the defibrating step is suppressed, and the fiber mat 4 can be obtained efficiently.
さらに、解繊工程では、解繊シリンダーＳを収納する混合部Ｍ内に除湿した空気を供給して積層体３を解繊することが好ましい。これによって、解繊された木質繊維１と粉末樹脂２の集合体が乾燥して水分量が減じられるため、解繊時に飛散した粉末樹脂２が混合部Ｍのカバー部Ｍ１や周囲の壁Ｍ２の内側に粉末樹脂２が付着することが抑制される。したがって、飛散した粉末樹脂２が吸引手段Ｆ（例えば、ファン）によって確実に吸引回収されて再投入されるため、粉末樹脂２のロスが抑制され、より効率的に繊維マット４を得ることができる。 Further, in the defibrating step, it is preferable to defibrate the laminate 3 by supplying dehumidified air into the mixing unit M that houses the defibrating cylinder S. As a result, the aggregate of the defibrated wood fiber 1 and the powder resin 2 is dried to reduce the amount of water, so that the powder resin 2 scattered at the time of defibration is covered with the cover part M1 of the mixing part M and the surrounding wall M2. The adhesion of the powder resin 2 to the inside is suppressed. Accordingly, since the scattered powder resin 2 is reliably sucked and collected by the suction means F (for example, a fan) and re-introduced, loss of the powder resin 2 is suppressed, and the fiber mat 4 can be obtained more efficiently. .
また、積層工程で形成される木質繊維１に液状物が含まれる場合には、解繊工程での積層体３の解繊時における粉末樹脂２の飛散を適度に調整することができる。 Moreover, when the liquid material is contained in the wood fiber 1 formed in the lamination process, the scattering of the powder resin 2 at the time of the defibration of the laminate 3 in the defibration process can be adjusted appropriately.
成形工程では、解繊工程で製造された繊維マット４を熱圧成形して、板状の木質繊維板を製造する。本発明の成形工程における、繊維マット４のプレス方法としては、バッチ式の平板プレスや連続プレスなどを採用することができるが、特に限定はされない。また、熱圧成形の際の温度や時間や圧力は、粉末樹脂２の種類や木質繊維板の厚みや密度などによって適宜に設定することができる。 In the molding process, the fiber mat 4 manufactured in the defibrating process is hot-press molded to manufacture a plate-like wood fiberboard. As a method for pressing the fiber mat 4 in the molding step of the present invention, a batch type flat plate press, a continuous press, or the like can be adopted, but is not particularly limited. Moreover, the temperature, time, and pressure at the time of hot pressing can be appropriately set depending on the type of the powder resin 2 and the thickness and density of the wood fiber board.
また、成形工程では、繊維マット４を熱圧成形する前に、必要に応じて、繊維マット４を予備圧締（プリプレス）することができる。また、繊維マット４を熱圧成形する前に、乾燥炉などにより繊維マット４を乾燥させることで繊維マット４の含水率を調整することもできる。 In the molding step, the fiber mat 4 can be pre-pressed (pre-pressed) as necessary before the fiber mat 4 is hot-press molded. In addition, the moisture content of the fiber mat 4 can be adjusted by drying the fiber mat 4 with a drying furnace or the like before hot pressing the fiber mat 4.
本発明の木質繊維板の製造方法によれば、積層体３の解繊によって飛散した粉末樹脂２は、解繊シリンダーＳの吸引手段Ｆによって内部に吸引回収され、再供給流路Ｗを通じて樹脂供給部Ｄ２に再投入される。このため、解繊工程で飛散した粉末樹脂２が再利用されてロスが抑制されるため、効率的に繊維マット４を得ることができる。 According to the method for producing a wood fiber board of the present invention, the powder resin 2 scattered by defibration of the laminated body 3 is sucked and collected inside by the suction means F of the defibrating cylinder S and supplied through the resupply channel W. Part D2 is reintroduced. For this reason, since the powder resin 2 scattered in the defibrating process is reused and the loss is suppressed, the fiber mat 4 can be obtained efficiently.
本発明の木質繊維板の製造方法は、以上の実施形態に限定されるものではない。例えば、積層工程における積層体には、例えば、珪藻土、シリカゲル、活性炭、ゼオライト、活性白土などの調湿材料が含まれていてもよい。さらに、本発明の木質繊維板の製造方法には、木質繊維板の表面に、必要に応じて、所望の着色、模様などを施した化粧シートや突き板を貼着する工程や、木質繊維板の表面に所望の塗料を塗装する工程なども含まれる。 The manufacturing method of the wood fiber board of this invention is not limited to the above embodiment. For example, the layered product in the layering step may contain humidity control materials such as diatomaceous earth, silica gel, activated carbon, zeolite, activated clay, and the like. Furthermore, the method for producing a wood fiber board of the present invention includes a step of attaching a decorative sheet or veneer having a desired coloring or pattern on the surface of the wood fiber board, if necessary, or a wood fiber board. A process of applying a desired paint on the surface of the film is also included.
１ 木質繊維
２ 粉末樹脂
３ 積層体
４ 繊維マット
Ｄ２ 樹脂供給部
Ｓ 解繊シリンダー
Ｆ 吸引手段
DESCRIPTION OF SYMBOLS 1 Wood fiber 2 Powder resin 3 Laminated body 4 Fiber mat D2 Resin supply part S Defibration cylinder F Suction means
Claims (3)
木質繊維の上に、樹脂供給部から粉末樹脂を供給して積層体を形成する積層工程、
前記積層体を解繊シリンダーで解繊して繊維マットを得る解繊工程、および
前記繊維マットを、熱圧成形して木質繊維板を製造する成形工程を含む木質繊維板の製造方法であって、
前記解繊シリンダーは、内部に吸引手段を備え、かつ、表面には内部へ通じる複数の小孔を備えており、前記積層体の解繊によって飛散した前記粉末樹脂を、前記解繊シリンダーの前記吸引手段によって内部に吸引回収して、前記樹脂供給部に再投入することを特徴とする木質繊維板の製造方法。 The following steps,
A laminating step of forming a laminate by supplying a powder resin from a resin supply unit on a wood fiber,
A method for producing a wood fiber board, comprising: a defibrating step of defibrating the laminate with a defibrating cylinder to obtain a fiber mat; and a forming step of producing a wood fiber board by hot pressing the fiber mat. ,
The defibrating cylinder is provided with suction means inside, and has a plurality of small holes leading to the inside on the surface, and the powder resin scattered by defibrating the laminate is used as the defibrating cylinder. A method for producing a wood fiberboard, wherein the suction means collects the suction by the inside and re-injects the resin into the resin supply section.
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