JP5238574B2 - Manufacturing method of wood composite board - Google Patents

Manufacturing method of wood composite board Download PDF

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JP5238574B2
JP5238574B2 JP2009075665A JP2009075665A JP5238574B2 JP 5238574 B2 JP5238574 B2 JP 5238574B2 JP 2009075665 A JP2009075665 A JP 2009075665A JP 2009075665 A JP2009075665 A JP 2009075665A JP 5238574 B2 JP5238574 B2 JP 5238574B2
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composite board
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克俊 岩城
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Daikin Industries Ltd
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Description

本発明は、耐傷性、耐クラック性に優れた木質床材の基材として用いる木質複合板の製造に関するものである。   The present invention relates to the production of a wood composite board used as a base material of a wood floor material excellent in scratch resistance and crack resistance.

従来より、合板基材の表面に突板を接着した床材が用いられているが、キャスター等による傷が問題となっていた。これを防止するため合板表面に硬い木質繊維板（特に中比重繊維板（ＭＤＦ））を接着した基材を用いた床材が使用されるようになっている。   Conventionally, floor materials in which a veneer is bonded to the surface of a plywood substrate have been used, but scratches caused by casters or the like have been a problem. In order to prevent this, flooring using a base material in which a hard wood fiberboard (particularly medium specific gravity fiberboard (MDF)) is bonded to the plywood surface is used.

これらの製造方法（合板基材と木質繊維板の貼り合せ）としては、最近はシックハウスの問題が大きく取上げられ、接着剤として溶剤系ではなく水系接着剤が用いられるようになっている。接着剤を塗布後貼り合せのためプレスで圧締するが、プレス方法としては、冷圧（コールドプレス）と熱圧(ホットプレス）の２種類の方法が設備状況に応じて用いられる。冷圧時においては接着剤の水分を合板と木質繊維板とが吸収した際に、木質繊維板の吸水膨張率が合板よりも大きいため、表面側が伸びて凸反りが発生する。一方、熱圧時には木質繊維板表面から強制加熱によって多量の水分が急速に蒸発し表面側への大きな凹反り（裏面側へ凸反り）が発生する。   As these manufacturing methods (plywood base material and wood fiberboard bonding), the problem of sick house has recently been largely taken up, and a water-based adhesive is used as an adhesive rather than a solvent-based adhesive. After the adhesive is applied, it is pressed with a press for bonding. As the pressing method, two types of methods, cold pressure (cold press) and hot pressure (hot press), are used depending on the equipment situation. At the time of cold pressure, when the moisture of the adhesive is absorbed by the plywood and the wood fiber board, the water absorption expansion coefficient of the wood fiber board is larger than that of the plywood, so that the surface side is extended and convex warpage occurs. On the other hand, during hot pressing, a large amount of water is rapidly evaporated from the surface of the wood fiber board by forced heating, and a large concave warp (convex warp toward the back side) occurs on the front side.

特開２００６−２２４６２６公報JP 2006-224626 A

これを解決するために、冷圧の場合は冷圧後の養生時に複合板の上から錘を載せて反りを矯正する必要がある。また熱圧の場合は、例えば、特許文献１のように最裏面と最表面の含水率を特定した単板を積層した合板表面に繊維板を接着し繊維板と最表面板の厚さ合計を複合板全体厚の５０％未満になるよう熱圧一体化することで、反りのない複合板の製造方法が提供されている。 In order to solve this, in the case of cold pressure, it is necessary to correct the warp by placing a weight on the composite plate during curing after cold pressure. In the case of hot pressure, for example, as in Patent Document 1, the fiberboard is bonded to the surface of the plywood laminated with the single plate that specifies the moisture content of the outermost surface and the outermost surface, and the total thickness of the fiberboard and the outermost surface plate There has been provided a method for producing a composite plate free from warping by integrating with heat and pressure so as to be less than 50% of the total thickness of the composite plate.

しかし、冷圧の場合は錘を載せたままの養生が約１週間は必要となり、さらに、広い場所を占めたり、状態放置のため季節による温湿度要因によって養生の品質が安定しないという問題が生じ生産性が低下する。熱圧の場合は、最裏面と最表面の単板の含水率を事前に調整する必要があり、熱圧処理で特定の厚みに限定しなければならない等、製造条件を調整する必要があり面倒である。また、高含水率の板材に強制的に熱をかけて高圧で圧締するため板内の水分が徐々に蒸発できずパンク現象が発生する虞がある。   However, in the case of cold pressure, curing with a weight placed on it is necessary for about one week, and further, there is a problem that the curing quality is not stable due to the temperature and humidity factors depending on the season because it occupies a large area or is left in the state Productivity decreases. In the case of hot pressure, it is necessary to adjust the moisture content of the veneer on the backmost surface and the outermost surface in advance, and it is necessary to adjust the manufacturing conditions, such as limiting to a specific thickness by hot-pressure treatment. It is. Further, since the plate material having a high water content is forcibly heated and pressed at a high pressure, the moisture in the plate cannot be gradually evaporated and a puncture phenomenon may occur.

本発明は、かかる問題点に鑑みなされたものであり、生産性を低下させることなく、板材に含水率調整等の前処理を施すことなく、反りが問題とならない合板と繊維板との複合板の製造方法を提供することを目的とする。   The present invention has been made in view of such problems, and is a composite board of plywood and fiberboard in which warpage does not become a problem without reducing productivity, without performing pretreatment such as moisture content adjustment on the board material. It aims at providing the manufacturing method of.

上記目的を解決するために、請求項１に係る木質複合板の製造方法の発明は、合板と木質繊維板とをその間に水性接着剤を介して冷圧接着して得られる木質複合板の木質繊維板側を、該木質繊維板に熱盤を圧締圧力が３ｋｇ／ｃｍ ２ 以下で接触させる熱圧によって乾燥させたことを特徴とする。 In order to solve the above-mentioned object, the invention of the method for producing a wood composite board according to claim 1 is characterized in that the wood composite board obtained by cold-pressure bonding a plywood and a wood fiber board through an aqueous adhesive therebetween. the fiber plate side, wherein the clamping pressure hot platen to the wood fiberboard is dried by the heat pressure contacted in 3 kg / cm 2 or less.

請求項１に係る発明によれば、合板と木質繊維板とをその間に水性接着剤を介して冷圧接着しているので、溶剤系接着剤のようにシックハウス等の発生を心配する必要がない。また、接着した木質複合板の木質繊維板側を熱盤を用いて乾燥させたので、水分の吸収により膨張率の異なる合板と木質繊維板に水系接着剤の水分が吸収されることで、接着一体化された木質複合板において、膨張率の大きな木質繊維板が伸びて表面側への凸反りが発生しても、木質繊維板を乾燥させることで逆に膨張率を下げ、一体化した木質複合板が反らないかあるいは表面側に凹反りさせた状態で養生させるので、最終的に反りを矯正することができる。また、冷圧のみでその後木質複合板に錘を載置した矯正養生と比較して養生時間を短縮できる。 According to the first aspect of the present invention, since the plywood and the wood fiber board are cold-pressure bonded via the aqueous adhesive therebetween, there is no need to worry about the occurrence of sick house or the like unlike the solvent-based adhesive. . In addition, because the wood fiber board side of the bonded wood composite board was dried using a hot platen , the moisture of the water-based adhesive was absorbed by the plywood and the wood fiber board with different expansion rates due to the absorption of moisture. In the integrated wood composite board, even if the wood fiber board with a large expansion coefficient is stretched and convex warpage occurs on the surface side, the wood fiber board is dried to lower the expansion coefficient, and the integrated wood texture Since the composite plate is cured without being warped or concavely warped on the surface side, the warp can be finally corrected. Further, the curing time can be shortened as compared with the straightening curing in which the weight is then placed on the wood composite board only by the cold pressure.

また、請求項１に係る発明によれば、木質繊維板に熱盤を接触させる熱圧によって乾燥させるので、木質繊維板のみを乾燥させることができ、上記で説明したように木質複合板の反りを簡単に矯正できる。 Further, the invention according to claim 1, since dried by heat pressing contacting the heating plate to wood fiberboard, can be dried only wood fiber board, wood composite board as described above Warp can be easily corrected .

さらに、請求項１に係る発明によれば、熱圧の圧締圧力が３ｋｇ／ｃｍ２以下と低圧であるので、圧締時に木質繊維板が内包する水分が急激に蒸発することによるパンク現象の発生、木質繊維板の圧縮べり（厚み減少）、プレスの熱盤表面の細かな凹凸が刻印されることによる木質繊維板表面のプレスマークが防止できる。 Furthermore, according to the invention according to claim 1, the clamping pressure of the heat pressure is 3 kg / cm 2 or less and a low-pressure, puncture phenomenon caused by moisture wood fiber board is included during clamping abruptly vaporizes Occurrence, compression slip (thickness reduction) of the wood fiber board, and press marks on the surface of the wood fiber board due to the fine irregularities on the hot platen surface of the press can be prevented.

本発明に係る木質複合板の断面図。Sectional drawing of the wood composite board which concerns on this invention. 本発明に係る木質複合板の熱処理方法を示す断面図。Sectional drawing which shows the heat processing method of the wood composite board concerning this invention.

以下、本発明を実施するための実施形態を説明する。もちろん本発明は本実施形態の記載内容に限られるものではない。   Hereinafter, an embodiment for carrying out the present invention will be described. Of course, the present invention is not limited to the description of the present embodiment.

図１は本発明に係る木質複合板Ａの断面図であって、合板１に接着剤３を介して木質繊維板２を接着一体化したものである。   FIG. 1 is a sectional view of a wood composite board A according to the present invention, in which a wood fiber board 2 is bonded and integrated to a plywood 1 via an adhesive 3.

合板１は、樹種、プライ数、厚み等特に限定されるものではないが、資源の枯渇や自然保護による伐採禁止の動きにより、上質の木材が得られ難くなっているので、植林木の積極的利用が行われている。例えば、ファルカタ、カメレレ、ユーカリ、ゴム、エリマ、ターミナリア、キャンプノス、ペルマ、アカシアマンギューム、ラジアータパイン、メルクシパイン、グメリナ、ポプラ等が挙げられる。その他従来から使用されているラワン、メランティ、セラヤ、アピトン、カポール等の南洋材、スギ、ヒノキ、マツ等の国産材を使用しても良いことはもちろんである。   The plywood 1 is not particularly limited in terms of tree species, number of plies, thickness, etc., but it is difficult to obtain high-quality timber due to the depletion of resources and the move to ban logging due to nature protection. The use is done. Examples include Falkata, Chamelere, Eucalyptus, Rubber, Elima, Terminaria, Campnos, Perma, Acacia Mangeum, Radiata Pine, Merck Pine, Gmelina, Poplar and the like. In addition, it is of course possible to use Southeastern wood such as Lauan, Meranti, Celaya, Apiton, Capol, etc., and domestic timber such as cedar, hinoki and pine.

木質繊維板２は、例えばＭＤＦ、インシュレーションボード、ハードボード等が使用される。これらは、そのまま使用されるだけではなく、樹脂を含浸したり塗布したりして強化された木質繊維板２も使用される。樹脂としては、例えば不飽和ポリエステルやイソシアネート等が使用される。   As the wood fiber board 2, for example, MDF, an insulation board, a hard board or the like is used. These are not only used as they are, but also wood fiber boards 2 reinforced by impregnating or applying resin are used. As the resin, for example, unsaturated polyester or isocyanate is used.

合板１と木質繊維板２とを接着一体化するための接着剤３は、シックハウス等の問題から水性接着剤が好ましい。例えば、ビニルウレタン系、酢酸ビニル系、オレフィン系等が用いられる。   The adhesive 3 for bonding and integrating the plywood 1 and the wood fiber board 2 is preferably a water-based adhesive because of problems such as sick house. For example, vinyl urethane, vinyl acetate, olefin, or the like is used.

合板１に接着剤３を塗布し木質繊維板２を冷圧で接着した木質複合板Ａを、図２に示すように上側の熱盤を加熱して木質繊維板２の側(上面）を乾燥させて、表面側への凸反りをしている木質複合板Ａを裏面側に反らせるようにして、水平から若干表面凹反り状態に矯正する。なお、このように冷圧後に反りを矯正するために熱圧する方法では、最初から熱圧のみで行う方法と比較して、低温、短時間、低圧で行えるので、前記説明したように、パンク現象、木質繊維板の圧縮べり、プレスマークが防止できる。 The wood composite board A to the adhesive 3 was applied wood fiber board 2 bonded by cold pressure plywood 1, side to heat the upper side of the heating plate as shown in FIG. 2 wood fibreboard 2 (top) the dried, the wood composite board a which has a convex warp of the surface side so as to deflect on the back side, to correct the slight surface凹反Ri state from the horizontal. In this way, the method of hot pressing to correct warp after cold pressure can be performed at a low temperature, a short time, and a low pressure as compared with the method of performing only hot pressure from the beginning. Compressive sliding of wood fiber board and press mark can be prevented.

植林木からなる寸法９４５ｍｍ×１８４０ｍｍに調整した厚さ９ｍｍの合板１に水性ビニルウレタン系樹脂３を１平方尺当り１７ｇ塗布し、その上に同寸法に調整した厚さ２．７ｍｍのＭＤＦ（木質繊維板）２を載置し、７ｋｇ／ｃｍ２で４０分間冷圧を行い複合板Ａを得た。 An aqueous vinyl urethane-based resin 3 is applied to a plywood 1 having a thickness of 9 mm adjusted to a size of 945 mm × 1840 mm made of afforested trees, and 17 g of MDF (woody material) adjusted to the same size is applied thereon. Fiberboard) 2 was placed and cold pressure was applied at 7 kg / cm 2 for 40 minutes to obtain a composite plate A.

その後、（１）放置養生（そのままの状態で養生）（２）矯正養生（表面側に錘を載置したまま養生）（３）熱圧養生（木質繊維板の側をホットプレスで短時間熱圧した後そのまま養生）の３水準の実験を行い、反りの状況を測定した。ホットプレスの条件は以下の通りである。（温度：１０５℃、時間：２分、圧力：１ｋｇ／ｃｍ２） After that, (1) neglected curing (curing as it is) (2) straightening curing (curing with the weight placed on the surface side) (3) hot-pressure curing (wood fiberboard side heat for a short time with a hot press) After pressing, the three-level experiment was conducted to measure the warpage. The conditions for hot pressing are as follows. (Temperature: 105 ° C., time: 2 minutes, pressure: 1 kg / cm 2 )

反りの状況は以下の通りである。（１）放置養生の場合は７日間の養生で表面側に凸反り(長さ方向への反り）が５〜１０ｍｍ程度発生。（２）矯正養生の場合は７日間の養生で表面側に凹反り(長さ方向への反り）が３〜１０ｍｍ程度発生。（３）熱圧養生の場合は３日間の養生で表面側に凹反り(長さ方向への反り）が５〜１０ｍｍ程度発生。 The warping situation is as follows. (1) In the case of neglected curing, convex warping (warping in the length direction) occurs about 5 to 10 mm on the surface side after curing for 7 days. (2) In the case of straightening curing, concave warping (warping in the length direction) occurs about 3 to 10 mm on the surface side after curing for 7 days. (3) In the case of heat and pressure curing, concave warping (warping in the length direction) occurs about 5 to 10 mm on the surface side after curing for 3 days.

矯正養生と熱圧養生では表面側への凹反りが発生した。表面側の凸反りは加工や塗装時の精度が上がらないが、表面側の凹反りは実質的に反りのあまりないフラットな状態と同様である。熱圧養生したものは、矯正養生と同様の効果が半分以下の日数で得られた。したがって、矯正養生に比較して生産性が大幅に向上し、錘を木質複合板Ａに載せたり降ろしたりする手間が省ける。 In the straightening curing and the heat and pressure curing, the concave warpage to the surface side occurred. Convex warpage on the surface side does not increase accuracy during processing or painting, but concave warpage on the surface side is substantially the same as a flat state with little warpage. In the case of the heat and pressure curing, the same effect as the straightening curing was obtained in less than half of the days. Therefore, the productivity is greatly improved as compared with the correction curing, and it is possible to save the trouble of placing or dropping the weight on the wood composite board A.

水分の吸収によって膨張率の異なる合板と木質繊維板とを接着一体化した場合に、反りの発生を防止でき従来よりも生産性に優れた木質複合板の製造方法を提供できる。   When a plywood having a different expansion coefficient and a wood fiber board are bonded and integrated due to moisture absorption, warping can be prevented and a method for producing a wood composite board having higher productivity than conventional ones can be provided.

１ 合板
２ 木質繊維板
３ 接着剤
４ 熱盤
Ａ 木質複合板 1 Plywood 2 Wood fiberboard 3 Adhesive 4 Heating board A Wood composite board

Claims (1)

合板と木質繊維板とをその間に水性接着剤を介して冷圧接着して得られる木質複合板の木質繊維板側を、該木質繊維板に熱盤を圧締圧力が３ｋｇ／ｃｍ ２ 以下で接触させる熱圧によって乾燥させたことを特徴とする木質複合板の製造方法。 The wood fiber board side of the wood composite board obtained by cold-pressure bonding between the plywood and the wood fiber board through an aqueous adhesive therebetween, and a hot platen on the wood fiber board with a pressing pressure of 3 kg / cm 2 or less production method of the wood composite board, characterized in that drying by the heat pressure contacting.
JP2009075665A 2009-03-26 2009-03-26 Manufacturing method of wood composite board Expired - Fee Related JP5238574B2 (en)

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JP5787395B2 (en) * 2011-03-30 2015-09-30 株式会社パルウッドマテリアル Manufacturing method of wood composite board
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CN104526821B (en) * 2014-12-08 2016-06-08 浙江百利达木业有限公司 The pretreatment technology of colding pressing of a kind of floor blank
CN106738110A (en) * 2016-12-01 2017-05-31 张建明 A kind of glued board is colded pressing production method

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