JP2011152679A - Method for producing woody board and woody board - Google Patents

Method for producing woody board and woody board Download PDF

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JP2011152679A
JP2011152679A JP2010014771A JP2010014771A JP2011152679A JP 2011152679 A JP2011152679 A JP 2011152679A JP 2010014771 A JP2010014771 A JP 2010014771A JP 2010014771 A JP2010014771 A JP 2010014771A JP 2011152679 A JP2011152679 A JP 2011152679A
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wood
heat
board
heating tank
superheated steam
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Masahiro Nakagawa
雅博 中川
Shinichi Suzuki
伸一 鈴木
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Panasonic Electric Works Co Ltd
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Panasonic Electric Works Co Ltd
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<P>PROBLEM TO BE SOLVED: To provide a method for producing a woody board excellent dimensional stability from wood chips or wood fibers in a short time. <P>SOLUTION: The wood chips 1 or the wood fibers, after being heated with superheated steam, are coated with an adhesive. The coated wood chips 1 or wood fibers are hot press-molded to produce the woody board 2. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

本発明は、木質チップ又は木質繊維を用いた木質ボードの製造方法及び木質ボードに関するものである。   The present invention relates to a method of manufacturing a wooden board using a wooden chip or a wooden fiber, and a wooden board.

木質チップ又は木質繊維を用いた木質ボードは、木質チップや木質繊維に接着剤を塗布し、これを熱圧成形することで形成している。したがって、木質チップ同士、あるいは木質繊維同士は点接触で接着されていることになり、合板のように面接触で接着されたものに比べ、膨張、収縮率が高く、湿度などの外部環境変化により膨張、収縮しやすく、寸法安定性が劣るという問題があった。   A wood board using wood chips or wood fibers is formed by applying an adhesive to the wood chips or wood fibers and then hot-pressing the adhesive. Therefore, the wood chips or wood fibers are bonded by point contact, and the expansion and contraction rate is higher than those bonded by surface contact like plywood, and due to changes in the external environment such as humidity. There existed a problem that it expand | swells and shrinks easily and dimensional stability is inferior.

そこで、木質チップ又は木質繊維を用いた木質ボードを、オートクレーブ内に入れ、水蒸気で加熱することで、木質ボードの寸法安定化を向上させようとすることが特許文献１等により提案されている。   Therefore, Patent Document 1 and the like propose to improve the dimensional stabilization of the wooden board by putting the wooden board using the wooden chip or the wooden fiber into the autoclave and heating it with water vapor.

特開平９−２１６２０６号公報Japanese Patent Laid-Open No. 9-216206 特開２００９−１３２０９４号公報JP 2009-1312094 A

しかしながら、上記特許文献１に示された従来例は、木質ボードをオートクレーブ内に入れ、水蒸気で加熱するので、木質ボードの表面、内部にそれぞれ存在する多数の木質チップ又は木質繊維を短時間で均一に加熱するのが難しい。このため、加熱処理後の木質ボードは、特に、内部に存在する木質チップ又は木質繊維の膨張、収縮率を十分に低減できず、表面の木質チップ又は木質繊維と、内部の木質チップ又は木質繊維の膨張、収縮率に差が生じ、寸法安定性の改善が十分でないという問題がある。   However, in the conventional example shown in Patent Document 1, a wooden board is placed in an autoclave and heated with steam, so that a large number of wooden chips or wooden fibers existing on the surface and inside of the wooden board are uniformly distributed in a short time. Difficult to heat. For this reason, the wood board after the heat treatment, in particular, cannot sufficiently reduce the expansion and contraction rate of the wood chips or wood fibers present inside, the surface wood chips or wood fibers and the interior wood chips or wood fibers. There is a problem in that the expansion and contraction rate of the film is different, and the dimensional stability is not sufficiently improved.

また、木質ボードの表面、内部にそれぞれ存在する多数の木質チップ又は木質繊維の加熱のばらつきをできるだけ少なくするには、長時間加熱する必要があり、生産性が悪いという問題がある。   In addition, in order to minimize the variation in heating of a large number of wood chips or wood fibers present on the surface and inside of the wood board, it is necessary to heat for a long time, resulting in poor productivity.

また、木質ボードに使用される接着剤が水蒸気加熱処理により劣化し、強度や寸法安定性が悪くなるという問題もある。   There is also a problem that the adhesive used for the wood board is deteriorated by the steam heat treatment, and the strength and dimensional stability are deteriorated.

また、特許文献２には、天然繊維を水蒸気加熱処理した後に、接着剤を塗布して熱圧成形するものが開示してあるが、この特許文献２は天然繊維を飽和水蒸気で処理するものであり、水蒸気加熱処理するには密閉系の容器に入れて加圧して処理する必要があるため、昇圧・減圧に時間がかかり、生産性が悪いという問題がある。   Further, Patent Document 2 discloses a method in which natural fibers are subjected to steam heat treatment, and then an adhesive is applied and hot pressing is performed. However, Patent Document 2 treats natural fibers with saturated steam. In addition, since steam heat treatment needs to be carried out in a closed container and pressurized, there is a problem that it takes time for pressure increase / decrease and productivity is poor.

本発明は、上記問題点に鑑みて発明したものであって、寸法安定性に優れた木質ボードを短時間で製造できる木質ボードの製造方法を提供すること、及び、この製造方法により得られる寸法安定性に優れた木質ボードを提供することを課題としている。   This invention is invented in view of the said problem, Comprising: Providing the manufacturing method of the wooden board which can manufacture the wooden board excellent in dimensional stability in a short time, and the dimension obtained by this manufacturing method The objective is to provide a wooden board with excellent stability.

本発明は、以下のような構成になっている。   The present invention has the following configuration.

本発明の木質ボードの製造方法は、木質チップ１又は木質繊維を過熱水蒸気により加熱処理を行い、その後、加熱処理済みの木質チップ１又は木質繊維に接着剤を塗布して、熱圧成形することで木質ボード２を製造することを特徴とする。   The manufacturing method of the wooden board of the present invention is to heat-process the wood chip 1 or the wood fiber with superheated steam, and then apply an adhesive to the heat-treated wood chip 1 or the wood fiber, followed by hot pressing. The wood board 2 is manufactured.

このように、あらかじめ加熱処理を行って膨張、収縮率を低下させた木質チップ１又は木質繊維を用いて木質ボード２を製造するので、表面、内部に存在する各木質チップ１又は木質繊維の膨張、収縮率が共に低く、寸法安定性の良い木質ボード２を製造できる。また、木質ボードを加熱処理するのではなく、木質チップ１又は木質繊維の状態で加熱処理するので、個々の木質チップ１又は木質繊維を内部まで短時間で均一に加熱処理することができる。また、木質チップ１又は木質繊維を加熱処理するに当たり、過熱水蒸気により加熱処理を行うので、無（低）酸素状態で木質チップ１又は木質繊維の高温加熱処理が可能となり、発火を防止しながら木質チップ１又は木質繊維の加熱処理を安全に且つ短時間で行える。   Thus, since the wood board 2 is manufactured using the wood chip 1 or wood fiber which has been subjected to heat treatment in advance to reduce the expansion and contraction rate, the expansion of each wood chip 1 or wood fiber existing on the surface and inside is produced. The wood board 2 having a low shrinkage ratio and good dimensional stability can be manufactured. Further, since the wood board is not heat-treated, but is heat-treated in the state of the wood chips 1 or wood fibers, the individual wood chips 1 or wood fibers can be uniformly heat-treated to the inside in a short time. In addition, when heat-treating the wood chip 1 or the wood fiber, the heat treatment is performed with superheated steam, so that the wood chip 1 or the wood fiber can be subjected to a high-temperature heat treatment without oxygen (low) oxygen state, and while preventing the ignition, the wood The heat treatment of the chip 1 or the wood fiber can be performed safely and in a short time.

また、材料供給部４と、攪拌・搬送手段５と、処理済材料排出部６を備えた加熱槽７と、該加熱槽７に過熱水蒸気を供給する過熱水蒸気供給装置８とで加熱処理装置３を構成し、該加熱処理装置３を用いて木質チップ１又は木質繊維を過熱水蒸気で連続加熱処理するのが好ましい。すなわち、加熱槽７の材料供給部４から加熱槽７内に木質チップ１又は木質繊維を連続的に供給し、加熱槽７内で過熱水蒸気により木質チップ１又は木質繊維を加熱すると共に攪拌・搬送手段５により攪拌しながら搬送する。このように、過熱水蒸気により加熱処理して攪拌・搬送手段５の終端から排出される加熱処理済みの木質チップ１又は木質繊維を処理済材料排出部６から連続して外部に排出することで加熱処理済みの木質チップ１又は木質繊維を連続して得る。   Further, the heat treatment apparatus 3 includes a material supply unit 4, a stirring / conveying means 5, a heating tank 7 provided with a processed material discharge unit 6, and a superheated steam supply apparatus 8 that supplies superheated steam to the heating tank 7. It is preferable that the wood chip 1 or the wood fiber is continuously heat-treated with superheated steam using the heat treatment apparatus 3. That is, the wood chip 1 or the wood fiber is continuously supplied from the material supply unit 4 of the heating tank 7 into the heating tank 7, and the wood chip 1 or the wood fiber is heated by the superheated steam in the heating tank 7 and is stirred and conveyed. It conveys with stirring by means 5. In this way, heating is performed by continuously discharging the heat-treated wood chips 1 or the wood fibers discharged from the end of the stirring / conveying means 5 with the superheated steam from the treated material discharge section 6 to the outside. Treated wood chips 1 or wood fibers are obtained continuously.

これにより、木質チップ１又は木質繊維を過熱水蒸気で簡単に連続加熱処理でき、寸法安定性の良い木質ボード２の製造時間が大幅に短縮できる。   Thereby, the wood chip 1 or the wood fiber can be easily and continuously heated with superheated steam, and the manufacturing time of the wood board 2 with good dimensional stability can be greatly shortened.

また、本発明の木質ボード２は、上記のような製造方法で得たものであるから、表面、内部に存在する各木質チップ１又は木質繊維が、共にほぼ同じ程度の低膨張、低収縮率であり、木質ボード２全体としての寸法安定性が優れている。   In addition, since the wood board 2 of the present invention is obtained by the manufacturing method as described above, the wood chips 1 or wood fibers existing on the surface and inside are both of the same degree of low expansion and low shrinkage. Thus, the dimensional stability of the whole wood board 2 is excellent.

本発明の製造方法は、過熱水蒸気により加熱処理した木質チップ又は木質繊維を用いて木質ボードを製造するので、表面、内部にそれぞれ存在する各木質チップ又は木質繊維の膨張率、収縮率が共に低く、寸法安定性に優れた木質ボードを短時間で製造できる。   In the production method of the present invention, a wood board is produced using wood chips or wood fibers heat-treated with superheated steam, so that the expansion rate and contraction rate of each wood chip or wood fiber existing on the surface and inside are low. A wood board with excellent dimensional stability can be manufactured in a short time.

また、本発明の木質ボードは、木質ボードの各部に存在する各木質チップ又は木質繊維の膨張、収縮率がほぼ同じで寸法安定性が優れている。   In addition, the wood board of the present invention has excellent dimensional stability because the expansion rate and contraction rate of each wood chip or wood fiber existing in each part of the wood board are substantially the same.

本発明の木質ボードの製造に当たって、前処理として木質チップ又は木質繊維の加熱処理を行うための加熱処理装置の概略説明図である。It is a schematic explanatory drawing of the heat processing apparatus for performing the heat processing of a wood chip or a wood fiber as pre-processing in manufacture of the wooden board of this invention. 本発明の木質ボードの製造に当たって、前処理として木質チップ又は木質繊維の加熱処理を行うための加熱処理装置の他の実施例の概略説明図である。In manufacture of the wooden board of this invention, it is a schematic explanatory drawing of the other Example of the heat processing apparatus for performing the heat processing of a wood chip or a wood fiber as pre-processing. （ａ）は木質ボードの斜視図であり、（ｂ）は（ａ）のＡ部分を拡大した破断斜視図である。(A) is a perspective view of a wood board, (b) is the fracture | rupture perspective view which expanded the A section of (a).

以下、本発明を添付図面に示す実施形態に基づいて説明する。   Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

本発明は、パーティクルボード、ＭＤＦ、ＯＳＢ、ウエハーボードなどの木質ボード２を製造するに当たり、木質チップ１又は木質繊維を加熱処理し、その後、加熱処理済みの木質チップ１又は木質繊維に接着剤を塗布して、熱圧成形することで木質ボード２を製造する。   In producing the wooden board 2 such as particle board, MDF, OSB, and wafer board, the present invention heats the wooden chip 1 or the wooden fiber, and then applies the adhesive to the heated wooden chip 1 or the wooden fiber. The wood board 2 is manufactured by applying and hot pressing.

木質チップ１又は木質繊維の加熱処理に当たっては、過熱水蒸気により加熱処理を行って、木質チップ１又は木質繊維の寸法安定化処理を行う。   In the heat treatment of the wood chip 1 or the wood fiber, the heat treatment is performed with superheated steam, and the dimensional stabilization treatment of the wood chip 1 or the wood fiber is performed.

木質材は、加熱処理することで木質材中のＯＨ基の疎水化やヘミセルロースの溶脱が行われるものと考えられており、その結果吸湿寸法安定性が向上する。   It is considered that the wood material is subjected to heat treatment so that the OH group in the wood material is hydrophobized and the hemicellulose is leached, and as a result, the hygroscopic dimensional stability is improved.

しかし、従来のように木質ボード２を加熱処理すると、表面部、内部を均一に加熱処理し難いため、加熱処理で膨張、収縮率を低減させるといえども、表面部に存在する木質チップ１又は木質繊維と、内部に存在する木質チップ１又は木質繊維の膨張、収縮率に差が生じる。   However, when the wood board 2 is heat-treated as in the prior art, it is difficult to heat-treat the surface portion and the inside uniformly. Therefore, although the expansion and contraction rate is reduced by the heat treatment, the wood chip 1 or There is a difference between the expansion rate and contraction rate of the wood fiber and the wood chip 1 or wood fiber present inside.

そこで、本発明は、木質チップ１又は木質繊維の状態で加熱処理を行って個々の木質チップ１又は木質繊維を均一に加熱処理し、この加熱処理済みの木質チップ１又は木質繊維を用いて木質ボード２を製造することで、各部の膨張、収縮率を均等に低減している。   Therefore, the present invention performs heat treatment in the state of the wood chip 1 or the wood fiber to uniformly heat the individual wood chips 1 or wood fibers, and uses the wood chips 1 or wood fibers subjected to the heat treatment to treat the wood. By manufacturing the board 2, the expansion and contraction rate of each part is uniformly reduced.

上記のように木質チップ１又は木質繊維の状態で加熱処理をすると、木質チップ１又は木質繊維は小さいので、短時間で内部まで均一に加熱処理できる。また、過熱水蒸気で処理するため、常圧のような低い圧力の水蒸気であっても高温で処理することができ、従来のような密閉系の容器に投入して加熱処理する必要がなく、昇圧・減圧の時間が不要となって短時間で処理できる。   When the heat treatment is performed in the state of the wood chip 1 or the wood fiber as described above, since the wood chip 1 or the wood fiber is small, the heat treatment can be uniformly performed to the inside in a short time. In addition, since it is treated with superheated steam, even steam at a low pressure such as normal pressure can be treated at a high temperature, and it is not necessary to heat it by placing it in a sealed container as in the prior art.・ Can be processed in a short time because no time is required for decompression.

加熱処理の温度は高い方が木質材中のＯＨ基の疎水化やヘミセルロースの溶脱が効果的に行われて寸法安定性が向上し、且つ、処理時間も短いが、有酸素状態では温度が高くなると木質材が燃えてしまう。木質材の発火温度は、３３０℃〜４７０℃、引火温度は２２０℃〜２６０℃程度であり、このため、有酸素状態では２００℃以上の処理を行う場合は着火の危険が生じる。そのため、低温状態で木質材の処理を行うことは可能であるが、処理時間が長くなってしまう。   The higher the temperature of the heat treatment, the more effective the hydrophobization of OH groups in the wood and the leaching of hemicellulose, the dimensional stability is improved, and the treatment time is short, but the temperature is high in the aerobic state. Then, the wood will burn. The ignition temperature of the wood material is 330 ° C. to 470 ° C., and the ignition temperature is about 220 ° C. to 260 ° C. For this reason, there is a risk of ignition when processing at 200 ° C. or higher in an aerobic state. Therefore, although it is possible to process a wooden material in a low temperature state, processing time will become long.

そこで、本発明は、過熱水蒸気で加熱処理を行うことで無（低）酸素状態で木質チップ１又は木質繊維を安全に高温加熱することを可能とし、短時間で木質チップ１又は木質繊維を高温加熱し、木質チップ１又は木質繊維中のＯＨ基の疎水化等を効果的に行うことを可能としている。   Therefore, the present invention makes it possible to heat the wood chip 1 or the wood fiber safely at a high temperature in the absence (low) oxygen state by performing the heat treatment with superheated steam, and the wood chip 1 or the wood fiber can be heated to a high temperature in a short time. By heating, it is possible to effectively hydrophobize the OH group in the wood chip 1 or wood fiber.

図１には木質チップ１又は木質繊維を加熱処理するための加熱処理装置３の一例を示している。   FIG. 1 shows an example of a heat treatment apparatus 3 for heat treating a wood chip 1 or wood fiber.

加熱処理装置３は、加熱槽７と加熱槽７に過熱水蒸気を供給する過熱水蒸気供給装置８とで構成してある。   The heat treatment apparatus 3 includes a heating tank 7 and a superheated steam supply apparatus 8 that supplies superheated steam to the heating tank 7.

加熱槽７は、両端部が側蓋９により閉じられた横筒状をしており、筒の一端部側が高く、他端部側が低くなるように少し傾斜している。   The heating tank 7 has a horizontal cylindrical shape whose both ends are closed by a side lid 9, and is slightly inclined so that one end side of the cylinder is high and the other end side is low.

加熱槽７の高くなった方の一端部の上面部に、ロータリーバルブ４ａを有するホッパー４ｂを設けて材料供給部４を形成し、加熱槽７の低くなった方の他端部の下面部に、ロータリーバルブ６ａを有する排出口６ｂを設けて処理済材料排出部６を形成している。   A material supply unit 4 is formed by providing a hopper 4b having a rotary valve 4a on the upper surface of the higher end of the heating tank 7, and the lower surface of the lower end of the heating tank 7 is formed on the lower surface. The processed material discharge part 6 is formed by providing a discharge port 6b having a rotary valve 6a.

加熱槽７には攪拌・搬送手段５が設けてある。攪拌・搬送手段５は、攪拌手段と搬送手段とが別々の手段であってもよく、また、共通の手段に攪拌機能と搬送機能を備えたものであってもよい。   The heating tank 7 is provided with stirring / conveying means 5. In the stirring / conveying means 5, the stirring means and the conveying means may be separate means, or a common means may be provided with a stirring function and a conveying function.

図１に示す実施形態では、加熱槽７の内部に螺旋形状をした螺旋翼１０を設けて攪拌・搬送手段５を構成している。螺旋翼１０は回転装置（図示せず）により回転するもので、一端部が材料供給部４側に位置し、他端部が処理済材料排出部６に位置しており、材料供給部４から供給された木質チップ１又は木質繊維を螺旋翼１０で攪拌しながら処理済材料排出部６側に搬送するようになっている。   In the embodiment shown in FIG. 1, the stirring / conveying means 5 is configured by providing a spiral blade 10 having a spiral shape inside the heating tank 7. The spiral blade 10 is rotated by a rotating device (not shown), and one end is located on the material supply unit 4 side and the other end is located on the processed material discharge unit 6. The supplied wood chip 1 or wood fiber is conveyed to the treated material discharge unit 6 side while being stirred by the spiral blade 10.

過熱水蒸気供給装置８は、水蒸気を加熱して過熱水蒸気を生成するためのもので、生成された過熱水蒸気は、過熱水蒸気供給装置８から供給路１１により加熱槽７内の一端部に供給されるようになっている。加熱槽７に供給される過熱水蒸気の温度は２００℃程度とする。   The superheated steam supply device 8 is for heating the steam to generate superheated steam, and the generated superheated steam is supplied from the superheated steam supply device 8 to one end portion in the heating tank 7 through the supply path 11. It is like that. The temperature of the superheated steam supplied to the heating tank 7 is about 200 ° C.

加熱槽７には排気口部１３が設けてあり、加熱槽７内に供給された過熱水蒸気は木質チップ１又は木質繊維を加熱した後、排気口部１３から外部に排気される。   The heating tank 7 is provided with an exhaust port 13, and the superheated steam supplied into the heating tank 7 is exhausted to the outside from the exhaust port 13 after heating the wood chip 1 or the wood fiber.

上記の構成の加熱処理装置３を用いて木質チップ１又は木質繊維を加熱処理するには以下のようにして行う。   Heat treatment of the wood chip 1 or wood fiber using the heat treatment apparatus 3 having the above-described configuration is performed as follows.

ホッパー４ｂには木質チップ１又は木質繊維が入れられ、ロータリーバルブ４ａを回転することで、ホッパー４ｂから加熱槽７内の一端部に木質チップ１又は木質繊維が連続（本発明においては断続的を含む。）して供給される。   The wood chip 1 or the wood fiber is put in the hopper 4b, and the wood chip 1 or the wood fiber is continuous from the hopper 4b to one end portion in the heating tank 7 by rotating the rotary valve 4a (in the present invention, the wood chip 1 or the wood fiber is intermittent. Supplied).

加熱槽７内の一端部に供給された木質チップ１又は木質繊維は、過熱水蒸気に晒された状態で螺旋翼１０で攪拌されながら搬送される。この時、木質チップ１又は木質繊維が螺旋翼１０で攪拌されながら過熱水蒸気で加熱されるので、連続して供給される個々の木質チップ１又は木質繊維がそれぞれ内部まで均等に加熱され、ＯＨ基の疎水化等が内部まで均等に且つ効果的に行われる。   The wood chip 1 or wood fiber supplied to one end in the heating tank 7 is conveyed while being stirred by the spiral blade 10 while being exposed to superheated steam. At this time, since the wood chip 1 or the wood fiber is heated with superheated steam while being stirred by the spiral blade 10, the individual wood chips 1 or wood fibers supplied continuously are heated evenly to the inside, respectively, Hydrophobization or the like is performed evenly and effectively to the inside.

螺旋翼１０で攪拌、加熱されながら搬送される木質チップ１又は木質繊維は、搬送終端に至るまでに加熱処理を完了し、この加熱処理が完了した木質チップ１又は木質繊維は排出口６ｂに供給され、ロータリーバルブ６ａを回転することで、外部に連続して排出される。   The wood chip 1 or the wood fiber that is conveyed while being stirred and heated by the spiral blade 10 completes the heat treatment until the end of the conveyance, and the wood chip 1 or the wood fiber that has been subjected to the heat treatment is supplied to the discharge port 6b. Then, by rotating the rotary valve 6a, it is continuously discharged to the outside.

なお、図１に示す実施形態においては、加熱槽７の外周に所定の間隔を介して電磁誘導コイル１２を配置し、電磁誘導コイル１２に電流を流すことで、鉄製の加熱槽７、鉄製の螺旋翼１０を誘導加熱するようになっている。したがって、本実施形態では電磁誘導加熱（ＩＨ加熱）により加熱槽７、螺旋翼１０が加熱され、攪拌されながら搬送される木質チップ１又は木質繊維が、加熱槽７、螺旋翼１０からの伝導伝熱、輻射伝熱によっても加熱され、よりいっそう効果的に加熱処理される。この電磁誘導加熱による加熱温度は２２０℃程度とする。   In the embodiment shown in FIG. 1, the electromagnetic induction coil 12 is arranged on the outer periphery of the heating tank 7 via a predetermined interval, and an electric current is passed through the electromagnetic induction coil 12, so that the iron heating tank 7 and the iron The spiral blade 10 is induction-heated. Therefore, in this embodiment, the heating tank 7 and the spiral blade 10 are heated by electromagnetic induction heating (IH heating), and the wood chip 1 or the wood fiber conveyed while being stirred is transferred from the heating tank 7 and the spiral blade 10. Heating is also performed by heat and radiant heat transfer, and the heat treatment is more effectively performed. The heating temperature by this electromagnetic induction heating is about 220 ° C.

上記のようにして加熱処理を行った寸法安定化処理済みの木質チップ１又は木質繊維を得て、この加熱処理済みの木質チップ１又は木質繊維を原料として、従来と同様にして木質ボード２を製造する。   A wood chip 1 or wood fiber that has been subjected to the heat treatment as described above is obtained, and the wood board 2 or wood fiber is subjected to the heat treatment using the wood chip 1 or wood fiber as a raw material in the same manner as before. To manufacture.

すなわち、上記のようにあらかじめ加熱処理済みの木質チップ１又は木質繊維に、合成樹脂の接着剤をスプレーして塗布し、その後、熱圧成形することで図３に示すような木質ボード２を製造する。   That is, the wood board 1 as shown in FIG. 3 is manufactured by spraying and applying a synthetic resin adhesive to the wood chips 1 or wood fibers that have been heat-treated in advance as described above. To do.

上記のようにして製造した木質ボード２は、表面側に存在する木質チップ１又は木質繊維、内部に存在する木質チップ１又は木質繊維とも、予めほぼ均等に加熱処理されたものを使用しているので、湿度による各部の寸法変化が小さく、ボード全体として寸法安定性が優れている。   The wood board 2 manufactured as described above uses a wood chip 1 or wood fiber existing on the surface side, and a wood chip 1 or wood fiber existing inside, which has been heat-treated in advance almost uniformly. Therefore, the dimensional change of each part by humidity is small, and the dimensional stability is excellent as a whole board.

図２には加熱処理装置３の他の実施形態を示している。   FIG. 2 shows another embodiment of the heat treatment apparatus 3.

本実施形態は、加熱槽７内に配設した攪拌搬送手段５を、回転軸１４に螺旋形状をした螺旋翼１０と羽根１４を突出して構成している。螺旋翼１０は回転軸１４の材料供給部４側に設け、回転軸１４の処理済材料排出部６側の端部から螺旋翼１０までの間の部位に、軸方向に沿って複数組の羽根１４を突設している。各組の羽根１４は、回転軸１４から複数の羽根１４を放射状に突出している（図２では３本の羽根１４をＹ字状に突出している）。軸方向においては羽根１４と羽根１４との間は殆ど隙間がないように並んでいる。また、羽根１４及び加熱槽７は、電磁誘導加熱されるようになっている。   In this embodiment, the stirring and conveying means 5 disposed in the heating tank 7 is configured by projecting a spiral blade 10 and a blade 14 having a spiral shape on a rotating shaft 14. The spiral blade 10 is provided on the material supply unit 4 side of the rotary shaft 14, and a plurality of sets of blades along the axial direction is provided in a region between the end of the rotary shaft 14 on the processed material discharge unit 6 side and the spiral blade 10. 14 is projected. Each pair of blades 14 projects a plurality of blades 14 radially from the rotating shaft 14 (in FIG. 2, three blades 14 project in a Y shape). In the axial direction, the blades 14 are arranged so that there is almost no gap between the blades 14. The blades 14 and the heating tank 7 are heated by electromagnetic induction.

また、過熱水蒸気供給装置８で生成された過熱水蒸気は、加熱槽７内の低くなった方の端部側（処理済材料排出部６側）に供給されるようになっている。   Moreover, the superheated steam produced | generated with the superheated steam supply apparatus 8 is supplied to the edge part side (processed material discharge | emission part 6 side) in the heating tank 7 which became lower.

排気口部１３は加熱槽７の高くなった方にずれた位置（図２では螺旋翼１０と羽根１４との間付近）に設けてある。   The exhaust port 13 is provided at a position shifted in the higher direction of the heating tank 7 (in the vicinity of between the spiral blade 10 and the blade 14 in FIG. 2).

本実施形態においては、材料供給部４から供給された木質チップ１又は木質繊維は螺旋翼１０により羽根１４側に送られる。羽根１４側に送られた木質チップ１又は木質繊維は回転する羽根１４に乗せられ、落下して隣の羽根１４（３本のうちの隣の羽根１４）に落ちるまでの間に過熱水蒸気が効率的に当たり、処理が促進される。   In the present embodiment, the wood chip 1 or wood fiber supplied from the material supply unit 4 is sent to the blade 14 side by the spiral blade 10. The wood chip 1 or the wood fiber sent to the blade 14 side is put on the rotating blade 14, and the superheated steam is efficient until it falls and falls to the adjacent blade 14 (the adjacent blade 14 of the three). The process is promoted.

なお、木質チップ１を過熱水蒸気で加熱処理するための加熱処理装置３としては、図１、図２に示すものにのみ限定されない。図１、図２の例では、加熱槽７は回転せず、加熱槽７内部に設けた螺旋翼１０（又は螺旋翼１０と羽根１４）を回転することで木質チップ１又は木質繊維を連続して攪拌しながら搬送しているが、内部に螺旋翼１０（又は螺旋翼１０と羽根１４）を設けた加熱槽７自体を回転することで、加熱槽７と共に螺旋翼１０（又は螺旋翼１０と羽根１４）を回転するようにしてもよい。また、排気口１３には圧力調整弁を設け、加熱槽７の内部の過熱水蒸気の圧力を調整するようにしてもよい。   In addition, as the heat processing apparatus 3 for heat-processing the wood chip | tip 1 with superheated steam, it is not limited only to what is shown in FIG. 1, FIG. In the example of FIGS. 1 and 2, the heating tank 7 does not rotate, and the wood chip 1 or the wood fiber is made continuous by rotating the spiral blade 10 (or the spiral blade 10 and the blade 14) provided in the heating tank 7. However, by rotating the heating tank 7 itself provided with the spiral blade 10 (or the spiral blade 10 and the blade 14), the heating blade 7 and the spiral blade 10 (or the spiral blade 10 and the like) are rotated. The blade 14) may be rotated. Further, a pressure adjustment valve may be provided at the exhaust port 13 to adjust the pressure of superheated steam inside the heating tank 7.

また、上記実施形態は、木質チップ１又は木質繊維の加熱処理を連続して行っている。このように、木質チップ１又は木質繊維を過熱水蒸気で連続加熱処理をすることで、処理時間を大幅に短縮でき、この結果、寸法安定性の良い木質ボード２の製造時間が大幅に短縮できる。   Moreover, the said embodiment performs the heat processing of the wood chip 1 or a wood fiber continuously. In this way, by continuously heating the wood chip 1 or the wood fiber with superheated steam, the processing time can be greatly shortened, and as a result, the manufacturing time of the wood board 2 with good dimensional stability can be greatly shortened.

もちろん、本発明において、木質チップ１又は木質繊維の加熱処理に当たり、上記のような連続加熱処理のみに限定されず、バッチ式で加熱処理してもよい。   Of course, in the present invention, the heat treatment of the wood chip 1 or the wood fiber is not limited to the continuous heat treatment as described above, and the heat treatment may be performed batchwise.

なお、本発明における木質チップ１としては木質小片のみに限定されず、本発明の木質チップ１の概念に木質粒状物も含まれるものとする。   Note that the wood chip 1 in the present invention is not limited to a small wood piece, and the concept of the wood chip 1 of the present invention includes a wood grain.

次に、実施例、比較例につき説明する。   Next, examples and comparative examples will be described.

（実施例）
建築用廃材を粉砕して、平均長さ２０ｍｍ程度、平均厚さ０．５ｍｍ程度、平均巾２ｍｍ程度の木質チップ１を形成する。 (Example)
The building waste material is pulverized to form a wood chip 1 having an average length of about 20 mm, an average thickness of about 0.5 mm, and an average width of about 2 mm.

上記木質チップ１を、図２に示す加熱処理装置３で、加熱処理をした。加熱処理に当たっては、過熱水蒸気温度２００℃、電磁誘導加熱による加熱温度２２０℃とし、加熱槽７への投入から加熱槽７からの排出までの時間、つまり加熱処理時間を５分間とした。   The wood chip 1 was heat-treated with the heat treatment apparatus 3 shown in FIG. In the heat treatment, the superheated steam temperature was 200 ° C., the heating temperature by electromagnetic induction heating was 220 ° C., and the time from the introduction to the heating tank 7 to the discharge from the heating tank 7, that is, the heat treatment time was 5 minutes.

上記のように加熱処理済みの木質チップ１に、木質チップ１の重量に対して１２重量％となるように接着剤をスプレー塗布した。使用する接着剤としては、イソシアネート系接着剤とメラミン系接着剤を重量比で２：１の割合で含有する接着剤を用いた。   The adhesive was spray-applied to the wood chips 1 that had been heat-treated as described above so as to be 12% by weight based on the weight of the wood chips 1. As an adhesive to be used, an adhesive containing an isocyanate adhesive and a melamine adhesive in a ratio of 2: 1 by weight was used.

次に、上記のようにして接着剤を塗布した加熱処理済みの木質チップ１を熱圧成形することで、厚さ１２ｍｍ、比重０．８のパーティクルボード（木質ボード２）を作製した。この時の熱圧成形の条件は、プレス温度１９０℃、プレス圧力約４５ｋｇ／ｃｍ２、プレス時間１０分とした。
（比較例）
建築用廃材を粉砕して、平均長さ２０ｍｍ程度、平均厚さ０．５ｍｍ程度、平均巾２ｍｍ程度の木質チップ１を形成する。 Next, the heat-treated wood chip 1 coated with an adhesive as described above was hot-press molded to produce a particle board (wood board 2) having a thickness of 12 mm and a specific gravity of 0.8. The conditions of the hot pressing at this time were a press temperature of 190 ° C., a press pressure of about 45 kg / cm 2 , and a press time of 10 minutes.
(Comparative example)
The building waste material is pulverized to form a wood chip 1 having an average length of about 20 mm, an average thickness of about 0.5 mm, and an average width of about 2 mm.

上記木質チップ１を、加熱処理することなく、実施例と同様に、木質チップ１の重量に対して１２重量％となるように実施例で用いたのと同じ接着剤をスプレー塗布した。   The same adhesive as that used in the example was spray-applied to the wood chip 1 so as to be 12% by weight with respect to the weight of the wood chip 1 without heat treatment.

次に、上記のようにして接着剤を塗布した加熱処理していない木質チップ１を実施例と同じ条件で熱圧成形することで、厚さ１２ｍｍ、比重０．８のパーティクルボード（木質ボード２）を作製した。   Next, the non-heat-treated wood chip 1 to which the adhesive is applied as described above is hot-press molded under the same conditions as in the embodiment, so that a particle board (wood board 2 having a thickness of 12 mm and a specific gravity of 0.8) is obtained. ) Was produced.

上記のようにして作製した実施例のパーティクルボードと、比較例のパーティクルボードを、それぞれ２０℃、６５％の雰囲気で平衡状態にした後、４０℃、９０％の雰囲気に５日間置いた際の寸法変化率を測定したところ、実施例のパーティクルボードは０．１６％、比較例のパーティクルボードは０．１８％であった。これにより、前処理で加熱処理した木質チップ１を使用する実施例のものは加熱処理していない木質チップ１を使用した比較例に比べて寸法変化率が小さく、湿気により変形し難いことが判明した。   When the particle board of the example produced as described above and the particle board of the comparative example were equilibrated in an atmosphere of 20 ° C. and 65%, respectively, and then placed in an atmosphere of 40 ° C. and 90% for 5 days. When the dimensional change rate was measured, the particle board of the example was 0.16%, and the particle board of the comparative example was 0.18%. As a result, it was found that the example using the wood chip 1 heat-treated in the pretreatment has a smaller dimensional change rate than the comparative example using the wood chip 1 not heat-treated, and is not easily deformed by moisture. did.

１ 木質チップ
２ 木質ボード
３ 加熱処理装置
４ 材料供給部
５ 攪拌・搬送手段
６ 処理済材料排出部
７ 加熱槽
８ 過熱水蒸気供給装置 DESCRIPTION OF SYMBOLS 1 Wood chip 2 Wood board 3 Heat processing apparatus 4 Material supply part 5 Stirring and conveyance means 6 Processed material discharge part 7 Heating tank 8 Superheated steam supply apparatus

Claims (3)

木質チップ又は木質繊維を過熱水蒸気により加熱処理を行い、その後、加熱処理済みの木質チップ又は木質繊維に接着剤を塗布して、熱圧成形することで木質ボードを製造することを特徴とする木質ボードの製造方法。   Wood material characterized in that a wood board is manufactured by heat-treating wood chips or wood fibers with superheated steam, and then applying an adhesive to the heat-treated wood chips or wood fibers, followed by hot pressing. Board manufacturing method. 材料供給部と、攪拌・搬送手段と、処理済材料排出部を備えた加熱槽と、該加熱槽に過熱水蒸気を供給する過熱水蒸気供給装置とで加熱処理装置を形成し、上記加熱槽の材料供給部から加熱槽内に木質チップ又は木質繊維を連続的に供給し、加熱槽内で過熱水蒸気により木質チップ又は木質繊維を加熱すると共に攪拌・搬送手段により攪拌しながら搬送し、攪拌・搬送手段の終端から排出される加熱処理済みの木質チップ又は木質繊維を処理済材料排出部から連続して外部に排出することで加熱処理済みの木質チップ又は木質繊維を連続して得ることを特徴とする請求項１記載の木質ボードの製造方法。   A heat treatment apparatus is formed by a material supply unit, a stirring / conveying means, a heating tank provided with a processed material discharge part, and a superheated steam supply device for supplying superheated steam to the heating tank, and the material of the heating tank A wood chip or wood fiber is continuously supplied from the supply unit into the heating tank, and the wood chip or wood fiber is heated with superheated steam in the heating tank and conveyed while stirring by the stirring / conveying means. The heat-treated wood chips or wood fibers discharged from the end of the wood are continuously discharged from the treated material discharge section to the outside to obtain heat-treated wood chips or wood fibers continuously. The manufacturing method of the wooden board of Claim 1. 請求項１又は請求項２記載の木質ボードの製造方法により得られた木質ボード。

A wooden board obtained by the method for manufacturing a wooden board according to claim 1 or 2.

JP2010014771A 2010-01-26 2010-01-26 Method for producing woody board and woody board Pending JP2011152679A (en)

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JP2011161835A (en) * 2010-02-12 2011-08-25 Nara Prefecture Production process of lignocellulosic filler, lignocellulosic filler produced by the process, lignocellulose-thermoplastic resin composite using the lignocellulosic filler, and molding using the lignocellulose-thermoplastic resin composite
JP2013159096A (en) * 2012-02-08 2013-08-19 Panasonic Corp Method of producing particle board
JP2013159095A (en) * 2012-02-08 2013-08-19 Panasonic Corp Particle board
JP2016030444A (en) * 2014-07-29 2016-03-07 忠南大學校 産學協力團 Continuous and rapid thermal processing system for timber
JP2018001142A (en) * 2016-07-08 2018-01-11 学校法人金井学園 Heating agitation device
CN111823342A (en) * 2019-04-19 2020-10-27 中山市大自然木业有限公司 Method for compressing wood board blank, single-layer hot press for same and wood board blank prepared by same

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Cited By (7)

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JP2011161835A (en) * 2010-02-12 2011-08-25 Nara Prefecture Production process of lignocellulosic filler, lignocellulosic filler produced by the process, lignocellulose-thermoplastic resin composite using the lignocellulosic filler, and molding using the lignocellulose-thermoplastic resin composite
JP2013159096A (en) * 2012-02-08 2013-08-19 Panasonic Corp Method of producing particle board
JP2013159095A (en) * 2012-02-08 2013-08-19 Panasonic Corp Particle board
JP2016030444A (en) * 2014-07-29 2016-03-07 忠南大學校 産學協力團 Continuous and rapid thermal processing system for timber
JP2018001142A (en) * 2016-07-08 2018-01-11 学校法人金井学園 Heating agitation device
WO2018008540A1 (en) * 2016-07-08 2018-01-11 学校法人金井学園 Heating and stirring device
CN111823342A (en) * 2019-04-19 2020-10-27 中山市大自然木业有限公司 Method for compressing wood board blank, single-layer hot press for same and wood board blank prepared by same

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