JPH1158332A - Wooden plate - Google Patents
Wooden plateInfo
- Publication number
- JPH1158332A JPH1158332A JP21530297A JP21530297A JPH1158332A JP H1158332 A JPH1158332 A JP H1158332A JP 21530297 A JP21530297 A JP 21530297A JP 21530297 A JP21530297 A JP 21530297A JP H1158332 A JPH1158332 A JP H1158332A
- Authority
- JP
- Japan
- Prior art keywords
- wood
- thickness
- absolute value
- board
- flakes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000011230 binding agent Substances 0.000 claims abstract description 60
- 229920005989 resin Polymers 0.000 claims abstract description 56
- 239000011347 resin Substances 0.000 claims abstract description 56
- 239000002023 wood Substances 0.000 claims description 160
- 239000004305 biphenyl Substances 0.000 claims description 2
- 235000010290 biphenyl Nutrition 0.000 claims description 2
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N phenylbenzene Natural products C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 claims description 2
- -1 polymethylene Polymers 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 239000006260 foam Substances 0.000 abstract description 8
- 230000007423 decrease Effects 0.000 abstract description 6
- 238000005187 foaming Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 4
- 238000003825 pressing Methods 0.000 abstract description 2
- 239000002344 surface layer Substances 0.000 description 17
- 239000012792 core layer Substances 0.000 description 15
- 238000005452 bending Methods 0.000 description 11
- 238000007731 hot pressing Methods 0.000 description 11
- 238000000465 moulding Methods 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 239000010410 layer Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 241000446313 Lamella Species 0.000 description 4
- 229920002522 Wood fibre Polymers 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000011120 plywood Substances 0.000 description 4
- 239000002025 wood fiber Substances 0.000 description 4
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000021736 acetylation Effects 0.000 description 3
- 238000006640 acetylation reaction Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 238000009408 flooring Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 230000000397 acetylating effect Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 239000012948 isocyanate Substances 0.000 description 2
- 150000002513 isocyanates Chemical class 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 229920005749 polyurethane resin Polymers 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 241001311472 Abies sachalinensis Species 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 241000218652 Larix Species 0.000 description 1
- 235000005590 Larix decidua Nutrition 0.000 description 1
- 241000218606 Pinus contorta Species 0.000 description 1
- 235000000405 Pinus densiflora Nutrition 0.000 description 1
- 240000008670 Pinus densiflora Species 0.000 description 1
- 235000008577 Pinus radiata Nutrition 0.000 description 1
- 241000218621 Pinus radiata Species 0.000 description 1
- 241000218626 Pinus sylvestris Species 0.000 description 1
- 235000008582 Pinus sylvestris Nutrition 0.000 description 1
- 241000183024 Populus tremula Species 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- FOCAUTSVDIKZOP-UHFFFAOYSA-N chloroacetic acid Chemical compound OC(=O)CCl FOCAUTSVDIKZOP-UHFFFAOYSA-N 0.000 description 1
- 229940106681 chloroacetic acid Drugs 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 210000000497 foam cell Anatomy 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 1
- 235000014684 lodgepole pine Nutrition 0.000 description 1
- 235000000673 shore pine Nutrition 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は木材薄片をバインダ
ー樹脂を用いて接着一体化してなる木質板に関し、特
に、厚さの絶対値が０．０５〜０．５０ｍｍの木材薄片
を用いることによって、表面と木口面の平滑度を向上さ
せ、しかも芯部の強度及び剛性を向上させたものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wooden board obtained by bonding and integrating wood flakes using a binder resin, and in particular, by using wood flakes having an absolute thickness of 0.05 to 0.50 mm. This improves the smoothness of the surface and the wood edge, and also improves the strength and rigidity of the core.
【０００２】[0002]
【従来の技術】近年、木材資源の不足や、森林の保護が
問題となってきており、森林伐採は今後益々困難になる
ことは明らかである。従って、原料木材を大量に使用し
て製造される合板等の板材は、その供給が不安定あるい
は供給不足となり、価格も高騰することが予想される。
よって、従来廃材とされていた木材薄片や、木材片の木
質繊維等を有効に利用して得られる木質板が注目され、
その木質板の種々の用途への応用が強く望まれている。2. Description of the Related Art In recent years, shortage of timber resources and protection of forests have become problems, and it is clear that deforestation will become more and more difficult in the future. Therefore, it is expected that the supply of plate materials such as plywood manufactured using a large amount of raw wood will be unstable or insufficient, and the price will rise.
Therefore, wood flakes obtained by effectively utilizing wood flakes, which have been conventionally used as waste wood, and wood fibers of wood flakes, are attracting attention.
The application of the wood board to various uses is strongly desired.
【０００３】木材薄片や木質繊維等を利用した木質板
は、一般に、木材薄片や木質繊維等の構成要素をバイン
ダーで接着し、成形一体化して形成される。その際、構
成要素の寸法が小さくなるに従い、得られる木質板は均
質になり、表面も平滑になるが、強度、剛性は低下し、
密度は増加する傾向がある。逆に構成要素の寸法を大き
くすると、木材本来が持っている強度、密度に近づいて
行くが、そのような木質板は不均質で、表面の凹凸も大
きくなる傾向がある。A wood board using wood flakes or wood fibers is generally formed by bonding components such as wood flakes or wood fibers with a binder and molding and integrating them. At that time, as the dimensions of the components become smaller, the resulting wooden board becomes homogeneous and the surface becomes smoother, but the strength and rigidity decrease,
Density tends to increase. Conversely, when the dimensions of the components are increased, the strength and density inherent in the wood are approached, but such a wooden board tends to be non-uniform and the surface irregularities also tend to be large.
【０００４】ところで上記のような木質板を床材に応用
するには、その木質板に強度、剛性、さらに表面平滑性
を持たせる必要があるが、例えば、木材を解繊して得ら
れる木質繊維を構成要素として知られている木質繊維集
積板では、均一で平滑な表面を有する木質板が得られる
が、床材としては強度不足であり、高強度にするために
木質板を厚くすると、密度が高いため重量が増加して取
扱い難くなる欠点があった。また、木材薄片をほぼ一定
方向に配列させてバインダーで接着し、成形一体化した
方向性木材薄片集成板では、強度の点で改善されてはい
るが、その表面は不均一で凹凸が大きいという問題があ
った。このような方向性木材薄片集成板を床材に応用し
た場合には、この方向性木材薄片集成板上に積層した化
粧単板表面に下地の方向性木材薄片集成板の凹凸が現出
し易いという問題が生じていた。In order to apply such a wooden board to flooring, it is necessary to impart strength, rigidity and surface smoothness to the wooden board. For example, a wooden board obtained by defibrating wood is used. With a wood fiber accumulation board known as a fiber component, a wood board having a uniform and smooth surface can be obtained, but as a flooring material, the strength is insufficient, and when the wood board is thickened for high strength, Due to the high density, there was a disadvantage that the weight increased and handling became difficult. In addition, the directional wood lamellas, which are made by arranging the wood flakes in a substantially constant direction, bonding them with a binder, and forming and integrating them, are improved in terms of strength, but the surface is uneven and has large irregularities. There was a problem. When such a directional wood laminate is applied to a flooring material, the unevenness of the underlying directional wood lamella tends to appear on the surface of the decorative veneer laminated on the directional wood lamella. There was a problem.
【０００５】そこで本発明者は表面平滑性と強度を向上
させた木質板を特願平５−２７９９１１号に提案してい
る。この木質板は、木材薄片の木目方向を一方向に配列
させ、これら木材薄片をバインダーを用いて接着し成形
一体化した方向性木材薄片集成板からなる表面層を、木
材薄片をバインダーを用いて接着し成形一体化した木材
薄片集成板からなる芯層の少なくとも一方の面に積層さ
れてなり、その表面層が上記芯層をなす木材薄片よりも
薄い木材薄片からなるものである。さらに、本発明者
は、このような構成の木質板において、耐湿性や耐水性
等を向上させるために発泡性樹脂と非発泡性樹脂とを
４：１〜１：４の比率で混合したものをバインダーとし
て用いたものを特願平５−２９３７１７号に提案してい
る。Accordingly, the present inventors have proposed a wooden board having improved surface smoothness and strength in Japanese Patent Application No. 5-279911. In this wood board, the grain direction of the wood flakes is arranged in one direction, and these wood flakes are bonded using a binder to form a surface layer composed of a directional wood flakes laminated and integrated, and the wood flakes are formed using a binder. It is laminated on at least one surface of a core layer made of a bonded and molded wood flake assembly, and the surface layer is made of wood flakes thinner than the wood flakes forming the core layer. Furthermore, the inventor of the present invention has made a wooden board having such a configuration in which a foamable resin and a non-foamable resin are mixed at a ratio of 4: 1 to 1: 4 in order to improve moisture resistance, water resistance, and the like. Is proposed in Japanese Patent Application No. 5-293717.
【０００６】ところがこれらの構成の木質板において
は、表面層の平滑性を向上でき、しかも芯層の強度及び
剛性を向上できるものの、厚みの異なる２種類の木材薄
片を用いるため、これら２種類の木材薄片をそれぞれ異
なるフレーカを用いて作製する工程や、芯層上に表面層
を積層する工程を要するため、木質板の製造に手間がか
かるという課題があった。また、芯層をなす木材薄片
は、表面層をなす木材薄片より厚みが厚く、しかも厚み
の絶対値が０．５〜１．５ｍｍの範囲とバラツキがある
ので、表面層の平滑性に悪影響がでる場合もあり、端面
である木口面から露出する芯層部分の表面が粗くなった
り、あるいは木質板の角部を削った場合、孔が生じるこ
とがあるので、木口面上に化粧板を貼着する際に接着が
困難であったり、化粧板に凹部が現出してしまう場合が
あった。[0006] However, in the wooden boards of these constructions, although the smoothness of the surface layer can be improved and the strength and rigidity of the core layer can be improved, two types of wood flakes having different thicknesses are used. There is a problem that a process of manufacturing the wood flakes using different flakers and a process of laminating the surface layer on the core layer are required. Also, the wood flakes forming the core layer are thicker than the wood flakes forming the surface layer, and the absolute value of the thickness varies from 0.5 to 1.5 mm, which adversely affects the smoothness of the surface layer. If the surface of the core layer exposed from the edge of the wood edge becomes rough, or if the corners of the wood board are shaved, holes may be formed. At the time of attachment, there were cases where adhesion was difficult or a concave portion appeared on the decorative board.
【０００７】また、上記木材薄片の幅が広すぎると、カ
ールしたり、折れ曲がり易いため、バインダーとの混合
時に折れ曲がった内側までバインダーが付着し難く、ま
た、成形時に空気の抜けが悪く、ボイド（泡）が発生し
易くなり、これらに起因して木材薄片が剥離したり、さ
らには得られる木質板の表面層の平滑度が低下する場合
があった。さらに、バインダーとして発泡性樹脂と非発
泡性樹脂との混合物を使用する場合にあっては、熱圧成
形時の温度が１６０〜２２０゜Ｃ程度、時間が目的とす
る板厚（ｍｍ）×１２〜２０秒程度かかるため、熱圧工
程が長くなったり、離形剤が２００゜Ｃ付近で分解する
場合もあり、圧力定盤・コールプレートとの離形性が悪
く、成形作業効率が悪くなる傾向にあった。また、非発
泡性樹脂の混在により、比重を高めに設定する必要が生
じ、密度が０．５５〜０．６８ｇ／ｃｍ3程度となるた
め、板厚を厚くすると重量が増大して扱いにくくなると
いう問題があった。On the other hand, if the width of the wood flakes is too large, the flakes are easily curled or bent, so that the binder does not easily adhere to the bent inside when mixed with the binder. Bubble) is likely to be generated, and as a result, wood flakes may be peeled off, and furthermore, the smoothness of the surface layer of the obtained wooden board may be reduced. Further, when a mixture of a foamable resin and a non-foamable resin is used as a binder, the temperature at the time of hot pressing is about 160 to 220 ° C., and the time required is a target sheet thickness (mm) × 12. Since it takes about 20 seconds, the hot-pressing process may be lengthened, or the release agent may be decomposed at around 200 ° C., resulting in poor releasability from the pressure platen / cold plate and poor molding efficiency. There was a tendency. Also, due to the mixture of non-foamable resin, it is necessary to set the specific gravity higher, and the density becomes about 0.55 to 0.68 g / cm 3. There was a problem.
【０００８】[0008]
【発明が解決しようとする課題】よって、本発明におけ
る課題は、木材薄片を原料とする木質板において、製造
工程の簡略化が可能であり、表面と木口面の平滑性を向
上でき、芯部の強度及び剛性を向上でき、木材薄片のカ
ールや折れ曲がりに起因するボイドの発生を低減でき、
密度を低く設定でき、耐水性を向上させて寸法安定性を
向上できることのうち、少なくとも製造工程の簡略化
と、表面と木口面の平滑性の向上と、強度及び剛性の向
上を実現できる木質板を提供することにある。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a wood board made from thin wood pieces, which can simplify the manufacturing process, improve the smoothness of the surface and the wood opening, and improve the core portion. Can reduce the occurrence of voids due to curling or bending of thin wood pieces,
Among the things that can set the density low and improve the dimensional stability by improving the water resistance, the wood board that can realize at least simplification of the manufacturing process, improvement of the smoothness of the surface and the lip, and improvement of the strength and rigidity Is to provide.
【０００９】[0009]
【課題を解決するための手段】請求項１記載の発明は、
厚さの絶対値が０．０５〜０．５０ｍｍの木材薄片がバ
インダー樹脂により接着一体化されてなることを特徴と
する木質板を上記課題の解決手段とした。また、請求項
２記載の発明は、前記木材薄片の幅の絶対値が１．００
〜５０．００ｍｍであることを特徴とする請求項１記載
の木質板を上記課題の解決手段とした。また、請求項３
記載の発明は、前記バインダー樹脂が発泡性樹脂からな
るものであることを特徴とする請求項１又は２記載の木
質板を上記課題の解決手段とした。また、請求項４記載
の発明は、前記バインダー樹脂がポリメチレン・ジフェ
ニル・ジイソシアネート（ＰＭＤＩ）であることを特徴
とする請求項３記載の木質板を上記課題の解決手段とし
た。また、請求項５記載の発明は、前記木材薄片は予め
アセチル化されたものであることを特徴とする請求項１
〜４のいずれかに記載の木質板を上記課題の解決手段と
した。According to the first aspect of the present invention,
A wood board characterized in that a piece of wood having an absolute thickness of 0.05 to 0.50 mm is bonded and integrated with a binder resin as a means for solving the above problem. In the invention according to claim 2, the absolute value of the width of the thin wood piece is 1.00.
The wood board according to claim 1, wherein the thickness is from 5 to 50.00 mm, is a means for solving the above problem. Claim 3
In the invention described above, the wood board according to claim 1 or 2 is characterized in that the binder resin is made of a foamable resin. According to a fourth aspect of the present invention, there is provided a wood board according to the third aspect, wherein the binder resin is polymethylene diphenyl diisocyanate (PMDI). The invention according to claim 5 is characterized in that the wood flakes are acetylated in advance.
A wood board according to any one of the above (1) to (4) is used as means for solving the above-mentioned problem.
【００１０】[0010]
【発明の実施の形態】以下、本発明の木質板の一実施形
態について説明する。本発明の木質板は、木材薄片がバ
インダー樹脂により接着一体化された木材薄片集成板か
らなるものである。本発明で用いられる木材薄片として
は、アカマツ、カラマツ、エゾマツ、トドマツ、アスペ
ン、ロッジポールパイン、ラジアータパイン等の薄片が
好適に用いられるが、樹種は特に限られるものではな
い。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, one embodiment of a wooden board of the present invention will be described. The woody board of the present invention is made of a wood thin laminated board in which wood thin pieces are bonded and integrated with a binder resin. As the wood flakes used in the present invention, flakes such as Japanese red pine, larch, Scots pine, Abies sachalinensis, aspen, lodgepole pine and radiata pine are preferably used, but the tree species is not particularly limited.
【００１１】上記木材薄片は、厚さの絶対値が０．０５
〜０．５０ｍｍ、厚さの平均値が０．１０〜０．４５ｍ
ｍのものが用いられる。ここで、木材薄片の厚さの絶対
値とは、用いる木材薄片を無作為に２００個以上抽出し
たときの最小と最大の厚さを意味し、厚さの平均値とは
上記抽出したサンプル（木材薄片）の厚さを平均した値
を意味するものとする。木材薄片の厚さの絶対値が０．
０５ｍｍ未満であると、得られる木質板の強度及び剛性
が低下し、プレス前のフォーミング時の嵩が増加し、生
産性が不利になるとともに成形後の密度も増加してしま
う。また、厚さの絶対値が０．５０ｍｍを超えると表面
の平滑性が低下してしまう。The above-mentioned wood flake has an absolute value of 0.05
0.50mm, average thickness 0.10-0.45m
m. Here, the absolute value of the thickness of the wood slice means the minimum and maximum thickness when 200 or more wood slices to be used are extracted at random, and the average value of the thickness is defined as the sample ( It means the average value of the thickness of the wood flakes. The absolute value of the thickness of the wood slice is 0.
When the thickness is less than 05 mm, the strength and rigidity of the obtained wooden board decrease, the bulk at the time of forming before pressing increases, the productivity becomes disadvantageous, and the density after molding also increases. On the other hand, when the absolute value of the thickness exceeds 0.50 mm, the smoothness of the surface decreases.
【００１２】また、上記木材薄片の長さは、絶対値が２
０．０〜１５０．０ｍｍ、平均値が４０．０〜１１５．
０ｍｍの範囲内であることが好ましい。ここで、木材薄
片の長さの絶対値とは、用いる木材薄片を無作為に５０
個以上抽出したときの最小と最大の長さを意味し、長さ
の平均値とは上記抽出したサンプル（木材薄片）の長さ
を平均した値を意味するものとする。また、上記木材薄
片の幅は、絶対値が１．００〜５０．００ｍｍ、平均値
が１０．００〜３５．００ｍｍの範囲内であることが好
ましい。ここで、木材薄片の幅の絶対値とは、用いる木
材薄片を無作為に５０個以上抽出したときの最小と最大
の幅を意味し、幅の平均値とは上記抽出したサンプル
（木材薄片）の幅を平均した値を意味するものとする。
木材薄片の幅の絶対値が１．００ｍｍ未満であると、幅
方向の接着不良となり、強度低下を引き起こしてしま
う。また、幅の絶対値が５０．００ｍｍを超えると木材
薄片がカールしたり、折れ曲がり易く、バインダーとの
混合時に折れ曲がった内側までバインダーが付着し難
く、また、成形時に空気の抜けが悪く、ボイド（泡）が
発生し易くなり、これらに起因して木材薄片が剥離した
り、さらには得られる木質板の表面の平滑度が低下して
しまう。Further, the length of the above-mentioned wood flakes has an absolute value of 2
0.0 to 150.0 mm, average value of 40.0 to 115.
Preferably, it is within a range of 0 mm. Here, the absolute value of the length of the wood flake means that the wood flake to be used is randomly determined by 50.
It means the minimum and maximum length when more than one piece is extracted, and the average length means the average value of the lengths of the extracted samples (wood flakes). Moreover, it is preferable that the absolute value of the width | variety of the said wood thin piece is in the range of 1.00-50.00 mm, and the average value is 10.00-35.00 mm. Here, the absolute value of the width of the wood slice means the minimum and maximum width when 50 or more wood slices to be used are extracted at random, and the average value of the width is the extracted sample (wood slice). Means the average of the widths.
If the absolute value of the width of the wood flakes is less than 1.00 mm, poor adhesion in the width direction occurs, causing a decrease in strength. If the absolute value of the width exceeds 50.00 mm, the wood flakes are easily curled or bent, and the binder is not easily adhered to the bent inside when mixed with the binder. Bubble) is likely to be generated, and as a result, wood flakes are peeled off, and furthermore, the smoothness of the surface of the obtained wooden board is reduced.
【００１３】また、木材薄片集成板をなす木材薄片の配
列は、特に制限されるものではないが、木目方向をほぼ
一方向に揃えて配列されたものであってもよく、あるい
は木質板を三層構造にし、隣接する層をなす木材薄片の
木目方向が互いに直交するように配列させてもよく、例
えば、上層の木目方向を平行方向、中間層の木目方向を
直交方向、下層の木目方向を平行方向としてもよい。さ
らに、目的とする木質板の強度や剛性に応じて同一方向
に配列する木材薄片の割合を変更できる。また、木材薄
片の木目方向はランダムにしてもよい。[0013] The arrangement of the wood flakes constituting the wood lamella is not particularly limited, but may be arranged with the grain direction substantially aligned in one direction, or three or more wood boards may be arranged. The layer structure may be arranged so that the grain directions of the adjacent thin wood pieces are orthogonal to each other.For example, the grain direction of the upper layer is parallel, the grain direction of the middle layer is orthogonal, and the grain direction of the lower layer is The directions may be parallel. Furthermore, the ratio of the thin wood pieces arranged in the same direction can be changed according to the strength and rigidity of the target wood board. The grain direction of the thin wood pieces may be random.
【００１４】本発明で用いられるバインダー樹脂として
は、木材薄片を相互に結合させるとともに、それ自体が
発泡するものであって、好ましくは、木材薄片同志の交
差点にのみ樹脂分を存在させ、木材薄片の小さな隙間
を、発泡セルで押し広げるようにすることにより、樹脂
分の使用量を少なくし、得られる木質板を低密度化させ
るものが用いられる。また、本発明で用いられるバイン
ダー樹脂としては、それ自体が発泡する発泡性バインダ
ーを使用する。この発泡性バインダーとしては、自己発
泡する発泡性樹脂、又はフェノール、ユリア、エポキ
シ、アクリル等の非発泡性樹脂に発泡剤を加えた混合系
発泡性樹脂のいずれを用いてもよいが、剛性の向上と密
度の低い木質板を得る点から自己発泡する発泡性樹脂か
ら構成されているのが好ましい。自己発泡する発泡性樹
脂の例としては、発泡性ポリウレタン樹脂、イソシアネ
ート系樹脂、好ましくはＰＭＤＩ（ポリメリックＭＤＩ
又は粗ＭＤＩ）を挙げることができる。発泡性ポリウレ
タン樹脂、又は、イソシアネート系樹脂を用いると、水
分と反応し易く、イソシアネート基（−ＮＣＯ）が水と
反応して自己発泡するため、反応時間が早くなりプレス
時間を短縮することができる。[0014] The binder resin used in the present invention is one which binds wood flakes to each other and foams itself. Preferably, a resin component is present only at the intersection of the wood flakes. By using a foam cell to spread out the small gaps, the amount of resin used is reduced and the density of the obtained wooden board is reduced. Further, as the binder resin used in the present invention, a foamable binder which foams itself is used. As the foamable binder, any of a self-foaming foamable resin, or a mixed foamable resin obtained by adding a foaming agent to a non-foamable resin such as phenol, urea, epoxy, and acrylic may be used. It is preferable to be made of a foamable resin that self-foams from the viewpoint of improving and obtaining a wood board having a low density. Examples of the self-foaming foamable resin include a foamable polyurethane resin and an isocyanate-based resin, preferably PMDI (polymeric MDI).
Or crude MDI). When an expandable polyurethane resin or an isocyanate-based resin is used, it easily reacts with moisture, and the isocyanate group (-NCO) reacts with water to self-expand, so that the reaction time is shortened and the press time can be reduced. .
【００１５】特に、ＰＭＤＩを用いるとバインダーとし
て接着力が強靱となる。また、このＰＭＤＩは低温で発
泡硬化するため反応時間が速く、具体的には熱圧成形時
の温度を１４０゜Ｃ〜１９０゜Ｃ、さらには１４０゜Ｃ
〜１６０゜Ｃ程度まで下げることができ、時間も目的と
する板厚（ｍｍ）×８〜１５秒程度と短くて済むので熱
圧工程を短縮できる。また、ＰＭＤＩをバインダー樹脂
として用いる場合は、上述のように成形温度が１４０゜
Ｃ〜１６０゜Ｃと低温であるので離形剤の分解を押える
ことができ、圧力定盤・コールプレートとの離形性が良
好で、成形作業効率が向上する。この木質板を構成する
木材薄片に対するバインダー樹脂の割合は、木材薄片１
００重量部（絶乾重量）に対して３．５〜２０重量部と
するのが好ましい。バインダー樹脂の添加量を変更する
ことにより、得られる木質板の密度および強度を変更す
ることもできる。In particular, when PMDI is used, the adhesive strength as a binder becomes strong. In addition, since the PMDI foams and cures at a low temperature, the reaction time is fast. Specifically, the temperature at the time of hot pressing is set to 140 ° C. to 190 ° C., and further, 140 ° C.
The temperature can be reduced to about 160 ° C., and the time can be as short as the desired plate thickness (mm) × 8 to 15 seconds. When PMDI is used as the binder resin, the molding temperature is as low as 140 ° C. to 160 ° C. as described above, so that the decomposition of the release agent can be suppressed, and the separation between the pressure platen and the cold plate can be prevented. Good formability and improved molding work efficiency. The ratio of the binder resin to the wood flakes constituting this wood board is 1 wood flake.
Preferably, the amount is 3.5 to 20 parts by weight based on 00 parts by weight (absolute dry weight). By changing the amount of the binder resin added, the density and strength of the obtained wooden board can also be changed.
【００１６】本発明の木質板をなす木材薄片は、予めア
セチル化しておくのが好ましい。木材薄片をアセチル化
する場合は、その木材薄片を含水率３％以下、好ましく
は１％以下になるまで乾燥した後、酢酸、無水酢酸、ク
ロル酢酸等の気化蒸気に接触させて気相中でアセチル化
（アセチル化度１２〜２０％）するのが好ましい。この
ように上記木材薄片をアセチル化することにより、耐水
性が得られ、木質板に寸法安定性を付与できる。The wood flakes constituting the wood board of the present invention are preferably acetylated in advance. When acetylating wood flakes, the wood flakes are dried to a moisture content of 3% or less, preferably 1% or less, and then contacted with vaporized vapor such as acetic acid, acetic anhydride, chloroacetic acid, etc. in the gas phase. Acetylation (degree of acetylation 12 to 20%) is preferred. By acetylating the wood flakes in this manner, water resistance can be obtained, and dimensional stability can be imparted to the wooden board.
【００１７】本発明の木質板を製造するには、上記木材
薄片にバインダー樹脂を塗布したものを乾式フォーミン
グし、それを熱圧成形するのが好ましく、具体的には、
まず、バインダー樹脂を塗布した木材薄片を熱圧板上に
散布して積層体を作製し、次に、熱圧成形機中でこの積
層体に熱圧を加えて熱圧成形する。その熱圧条件は、圧
力が１〜２ＭＰａ、温度が１４０〜１９０℃、時間が目
的とする厚み（ｍｍ）×８〜１５秒とすることが好まし
い。このようにして得られる木質板は、密度が０．４０
〜０．６５ｇ／ｃｍ3程度、曲げ強さが３００〜７００
ｋｇ／ｃｍ2程度、曲げヤング係数が３０〜７０ｔ／ｃ
ｍ2程度とすることが好ましい。In order to manufacture the wood board of the present invention, it is preferable to dry-form the above-mentioned wood flakes coated with a binder resin and then to hot-press them.
First, a thin piece of wood coated with a binder resin is sprayed on a hot pressing plate to produce a laminate, and then the laminate is subjected to hot pressing in a hot pressing machine to perform hot pressing. The heat and pressure conditions are preferably such that the pressure is 1 to 2 MPa, the temperature is 140 to 190 ° C., and the time is the desired thickness (mm) × 8 to 15 seconds. The wood board thus obtained has a density of 0.40
０．６0.65 g / cm 3 , flexural strength 300-700
kg / cm 2 , bending Young's modulus is 30 ~ 70t / c
It is preferably about m 2 .
【００１８】この実施形態の木質板にあっては、厚さの
絶対値が０．０５〜０．５０ｍｍの木材薄片をバインダ
ー樹脂により接着一体化されたことにより、用いる木材
薄片が１種類で済むので、従来の木質板のように厚さの
絶対値の範囲が異なる２種類の木材薄片をそれぞれ異な
るフレーカを用いて作製しなくても済み、また、芯層上
に表面層を積層する工程も必要ないので、木質板を製造
するための装置数を減らすことができるうえ製造工程の
簡略化が可能で、これによって木質板の製造効率を向上
させることができる。さらに、この実施形態の木質板に
おいては、芯層と表面層に用いる木材薄片の厚さの範囲
が同じであるので芯層と表面層が均一であり、しかも木
材薄片の厚みの絶対値が０．０５〜０．５０ｍｍと狭い
範囲であるのでバラツキが小さく、従って表面及び木口
面の平滑性が優れており、木質板の角部を削って孔が生
じることを低減できるので木口面上に化粧板を貼着し易
く、しかも化粧板に凹部が現出するのを低減できる。In the wood board of this embodiment, only one kind of wood piece is used because wood pieces having an absolute value of thickness of 0.05 to 0.50 mm are bonded and integrated with a binder resin. Therefore, it is not necessary to produce two kinds of wood flakes having different absolute value ranges of thickness using different flakers like a conventional wood board, and a step of laminating a surface layer on a core layer is also required. Since it is not necessary, the number of apparatuses for manufacturing a wooden board can be reduced, and the manufacturing process can be simplified, whereby the manufacturing efficiency of the wooden board can be improved. Further, in the wood board of this embodiment, the thickness range of the wood flakes used for the core layer and the surface layer is the same, so that the core layer and the surface layer are uniform, and the absolute value of the thickness of the wood flakes is 0. Since it is in a narrow range of 0.05 to 0.50 mm, the dispersion is small, and therefore, the surface and the edge of the wood edge are excellent in smoothness. The plate can be easily attached, and the appearance of the concave portion on the decorative plate can be reduced.
【００１９】また、特に、上記木材薄片として幅の絶対
値が１．００〜５０．００ｍｍの範囲のものを用いたも
のにあっては、木材薄片のカールや折れ曲がりを防止で
きるため、バインダー樹脂との混合時にバインダー樹脂
が木材薄片に均一に付着し易く、しかも成形時の空気の
抜けが良好でボイド（泡）の発生を低減できるので、木
材薄片の剥離を防止できるうえ木質板の表面の平滑性を
向上できる。また、特に、上記バインダー樹脂として発
泡性樹脂からなるものを用いたものにあっては、バイン
ダー樹脂が発泡性樹脂のみからなるものであるので、密
度が０．４０〜０．５５ｇ／ｃｍ3程度と低い木質板を
得ることができ、しかも木材薄片により均一に塗布で
き、剛性を向上させることができる。さらに、バインダ
ーの構成材料が少ないので、木材薄片にバインダーを塗
布する装置内のバインダー吐出用ノズル数を減らすこと
ができ、これによってバインダー塗布装置の簡素化が可
能であり、バインダー塗布作業効率が向上する。また、
特に、バインダー樹脂としてＰＭＤＩからなるものを用
いたものにあっては、熱圧成形時の温度を１４０〜１６
０゜Ｃ程度まで下げることができ、時間も目的とする板
厚（ｍｍ）×８〜１５秒程度と短くて済むので熱圧工程
を短縮できる。また、ＰＭＤＩをバインダー樹脂として
用いる場合は、上述のように成形温度が１４０゜Ｃ〜１
６０゜Ｃと低温であるので離形剤の分解を押えることが
でき、圧力定盤・コールプレートとの離形性が良好で、
成形作業効率が向上する。また、特に、上記木材薄片を
予めアセチル化したものを用いたものにあっては、耐水
性が向上し、寸法安定性が向上する。In particular, in the case of using the above-mentioned wood flakes having an absolute width of 1.00 to 50.00 mm, curling or bending of the wood flakes can be prevented. The binder resin easily adheres to the wood flakes uniformly during mixing, and since the air is well vented during molding and the generation of voids (foam) can be reduced, the separation of the wood flakes can be prevented and the surface of the wooden board is smooth. Performance can be improved. In particular, in the case of using a foaming resin as the binder resin, the density is about 0.40 to 0.55 g / cm 3 because the binder resin is only the foaming resin. And a low wood board can be obtained, and can be more uniformly applied to a thin piece of wood to improve rigidity. In addition, since the constituent material of the binder is small, the number of nozzles for ejecting the binder in the apparatus for applying the binder to the wood flakes can be reduced, thereby simplifying the binder application apparatus and improving the efficiency of the binder application operation. I do. Also,
In particular, in the case of using PMDI as the binder resin, the temperature at the time of hot pressing is set to 140 to 16
The temperature can be reduced to about 0 ° C., and the time can be as short as the desired plate thickness (mm) × 8 to 15 seconds. When PMDI is used as the binder resin, the molding temperature is set to 140 ° C. to 1 ° C. as described above.
Since the temperature is as low as 60 ° C, the decomposition of the release agent can be suppressed, and the releasability from the pressure platen / cold plate is good.
Molding work efficiency is improved. In particular, in the case of using the above-mentioned wood flakes that have been acetylated in advance, the water resistance is improved and the dimensional stability is improved.
【００２０】[0020]
【実施例】以下、本発明の木質板を更に理解しやすくす
るため、実施例について説明する。かかる実施例は、本
発明の一態様を示すものであり、この発明を限定するも
のではなく、本発明の範囲で任意に変更可能である。 （実施例１）厚さの絶対値が０．０５〜０．５ｍｍ（厚
さの平均値が０．２ｍｍ）、幅の絶対値が１〜５０ｍｍ
（幅の平均値が１８ｍｍ）、長さの絶対値が２０〜１５
０ｍｍ（長さの平均値が１００ｍｍ）である木材薄片
を、シェービングマシン（（株）岩倉組製）で作製し
た。バインダー樹脂としてＰＭＤＩ（粗ＭＤＩ、住友バ
イエルウレタン社製のスミジュール４４Ｖ２０（商品
名））を１５重量部を用意し、低速で回転する回転ドラ
ム内に、上記の木材薄片１００重量部を入れて、ドラム
内で自然落下する際にスプレーにより散布することによ
り、木材薄片にバインダー樹脂を塗布した。ついで、バ
インダー樹脂を塗布した木材薄片を、熱圧板上に木目方
向がランダムになるように散布し、厚さ約１５５ｍｍの
積層体とした。その積層体を、厚さ１２ｍｍとなるよう
に、温度１６０℃、圧力２ＭＰａで２分間熱圧成形し
た。このようにして作製した木質板の表面及び木口面の
平滑性は良好であり、角部を削っても木質化粧板やＰＶ
Ｃシート等を貼着した際に凹部が現出するような孔は生
じていなかった。上記の木質板について、その密度、曲
げ強さ及び曲げヤング係数を測定した。曲げ強さに関し
ては、ＪＩＳ−Ａ５９０８に基づいて評価した。その結
果、密度は０．５３ｇ／ｃｍ3、曲げ強さは５５５ｋｇ
／ｃｍ2、曲げヤング係数は５１ｔ／ｃｍ2であった。EXAMPLES Examples of the present invention will be described below in order to make the wooden board of the present invention easier to understand. These examples show one embodiment of the present invention, and do not limit the present invention, and can be arbitrarily changed within the scope of the present invention. (Example 1) Absolute value of thickness is 0.05 to 0.5 mm (average value of thickness is 0.2 mm), and absolute value of width is 1 to 50 mm
(The average value of the width is 18 mm), and the absolute value of the length is 20 to 15
A thin piece of wood having a length of 0 mm (average length of 100 mm) was produced by a shaving machine (manufactured by Iwakura Gumi Co., Ltd.). 15 parts by weight of PMDI (crude MDI, Sumidur 44V20 (trade name) manufactured by Sumitomo Bayer Urethane Co., Ltd.) was prepared as a binder resin, and 100 parts by weight of the above-described wood flakes were put in a rotating drum rotating at a low speed. The binder resin was applied to the thin wood pieces by spraying when spontaneously falling in the drum. Next, a thin piece of wood to which the binder resin was applied was sprayed on a hot pressing plate so that the grain direction became random, to obtain a laminate having a thickness of about 155 mm. The laminate was hot-press molded at a temperature of 160 ° C. and a pressure of 2 MPa for 2 minutes to a thickness of 12 mm. The smoothness of the surface of the wooden board thus manufactured and the edge of the wood edge are good, and even if the corners are cut, the wooden decorative board and PV
There was no hole in which a concave portion appeared when the C sheet or the like was stuck. The density, flexural strength and flexural Young's modulus of the woody board were measured. The bending strength was evaluated based on JIS-A5908. As a result, the density was 0.53 g / cm 3 and the bending strength was 555 kg.
/ Cm 2 , and the bending Young's modulus was 51 t / cm 2 .
【００２１】（実施例２）木材薄片として実施例１の木
材薄片を予めアセチル化したもの（アセチル化度２０
％）を用いた以外は、上記実施例１と同様にして木質板
を作製した。実施例１〜２で作製した木質板の耐水性に
ついてＪＩＳ−Ａ５９０８に基づいて評価したところ、
実施例１の木質板は２５゜Ｃの水中に２４時間浸漬後の
吸水厚さ膨張率が３．０％であるのに対し、予めアセチ
ル化した木材薄片を用いた実施例２の木質板は、吸水厚
さ膨張率が０．５％まで低減でき、実施例１のものに比
べて吸水厚さ膨張率が小さく、寸法安定性が優れている
ことがわかる。(Example 2) As the wood flakes, the wood flakes of Example 1 were pre-acetylated (acetylation degree 20).
%), A wooden board was produced in the same manner as in Example 1 above. When the water resistance of the wooden boards produced in Examples 1 and 2 was evaluated based on JIS-A5908,
The wood board of Example 1 had a water absorption thickness expansion coefficient after immersion in water at 25 ° C. for 24 hours of 3.0%, whereas the wood board of Example 2 using pre-acetylated wood flakes It can be seen that the coefficient of expansion of the water absorption thickness can be reduced to 0.5%, the coefficient of expansion of the water absorption thickness is smaller than that of Example 1, and the dimensional stability is excellent.
【００２２】（比較例１） 芯層をなす木材薄片として、長さの絶対値が７０〜８
０ｍｍ（長さの平均値が７５ｍｍ）、幅の絶対値が５〜
５０ｍｍ（幅の平均値が２０ｍｍ）、厚さの絶対値が
０．５〜１．５０ｍｍ（厚さの平均値が０．７５ｍｍ）
である木材薄片を、シェービングマシン（（株）岩倉組
製）で作製した。バインダー樹脂としてＰＭＤＩ（粗Ｍ
ＤＩ、住友バイエルウレタン社製のスミジュール４４Ｖ
２０（商品名）））と未濃縮ユリア樹脂の固形分重量比
２：１の混合物１５重量部を用意し、低速で回転する回
転ドラム内に、上記の木材薄片１００重量部を入れて、
ドラム内で自然落下する際にスプレーにより散布するこ
とにより、木材薄片に用意した上記バインダー樹脂を塗
布した。 表面層をなす木材薄片として、長さの絶対値が７０〜
８０ｍｍ、幅の絶対値が５〜５０ｍｍ、厚さの絶対値が
０．１０〜０．４８ｍｍ（厚さの平均値が０．３５ｍ
ｍ）である木材薄片を、シェービングマシン（（株）岩
倉組製）で作製した。水性フェノールバインダーを固形
分重量で１５重量部を用意し、低速で回転する回転ドラ
ム内に、上記の木材薄片１００重量部を入れて、ドラム
内で自然落下する際にスプレーにより散布することによ
り、木材薄片にバインダー樹脂を塗布した。(Comparative Example 1) As a piece of wood constituting a core layer, the absolute value of the length was 70 to 8
0 mm (average length is 75 mm), absolute width is 5
50 mm (average width 20 mm), absolute thickness 0.5-1.50 mm (average thickness 0.75 mm)
Was prepared using a shaving machine (manufactured by Iwakura Gumi). PMDI (crude M
DI, Sumitomo Bayer Urethane Sumijur 44V
20 (trade name)) and 15 parts by weight of a mixture of unconcentrated urea resin having a solid content weight ratio of 2: 1 were prepared, and 100 parts by weight of the above-mentioned wood flakes were put in a rotating drum rotating at a low speed.
The binder resin prepared above was applied to a thin piece of wood by spraying with a spray when naturally falling in the drum. The absolute value of the length is 70-
80 mm, the absolute value of the width is 5 to 50 mm, the absolute value of the thickness is 0.10 to 0.48 mm (the average value of the thickness is 0.35 m
m) was produced with a shaving machine (manufactured by Iwakura Gumi). Prepare 15 parts by weight of the aqueous phenol binder in terms of solid content, put 100 parts by weight of the above-mentioned wood flakes in a rotating drum that rotates at a low speed, and spray it by spraying when it falls naturally in the drum, A binder resin was applied to the wood flakes.
【００２３】まず、バインダー樹脂を塗布した表面層用
木材薄片のうちの半分を、熱圧板上に、木目方向がラン
ダムになるように散布し、その上に、発泡性バインダー
を塗布した芯層用木材薄片を散布した。さらにその上
に、残りの表面層用木材薄片を木目方向がランダムにな
るように散布し、厚さ約１３０ｍｍの積層体とした。そ
の積層体を、厚さ１２ｍｍとなるように、温度２１０
℃、圧力２ＭＰａで４分間熱圧同時成形した。なお、表
面層を構成する木材薄片と芯層を構成する木材薄片のバ
インダー塗布前の重量比は、表面層木材薄片／芯層木材
薄片＝５０：５０であった。このようにして作製した、
芯層の両面に表面層を設けた木質板の表面及び木口面の
平滑性は、実施例の木質板に比べて劣るものであった。
上記の木質板について、その密度、曲げ強さ及び曲げヤ
ング係数を測定した。その結果、密度は０．６５ｇ／ｃ
ｍ3、曲げ強さは５３０ｋｇ／ｃｍ2、曲げヤング係数は
４９ｔ／ｃｍ2であった。比較例１の木質板は、実施例
１の木質板より密度が大きいものであった。First, half of the surface layer wood flakes to which the binder resin has been applied are sprayed on a hot pressing plate so that the grain direction is random, and the foam layer is coated thereon with a foaming binder. Wood slices were sprayed. Further, the remaining thin wood pieces for the surface layer were sprayed thereon so that the grain direction became random, to obtain a laminate having a thickness of about 130 mm. The laminated body is heated at a temperature of 210 mm so as to have a thickness of 12 mm.
Simultaneous hot and pressure molding was performed at 4 ° C. and a pressure of 2 MPa for 4 minutes. The weight ratio of the wood flakes constituting the surface layer to the wood flakes constituting the core layer before applying the binder was surface layer wood flakes / core layer wood flakes = 50: 50. Made in this way,
The smoothness of the surface of the wood board provided with the surface layer on both sides of the core layer and the wood opening was inferior to the wood board of the example.
The density, flexural strength and flexural Young's modulus of the woody board were measured. As a result, the density is 0.65 g / c.
m 3 , flexural strength was 530 kg / cm 2 , and flexural Young's modulus was 49 t / cm 2 . The wood board of Comparative Example 1 had a higher density than the wood board of Example 1.
【００２４】（比較例２）実施例の木質板と同様の厚み
を有する合板について、実施例と同様に密度、曲げ強さ
及び曲げヤング係数の測定を行った。その結果、密度は
０．５５ｇ／ｃｍ 3、曲げ強さは５４７ｋｇ／ｃｍ2、曲
げヤング係数は４５ｔ／ｃｍ2であった。これらの結果
から、本発明の木質板は、合板と同等以下の密度であ
り、なおかつ合板にほぼ匹敵する曲げ強さを有している
ことがわかる。(Comparative Example 2) The same thickness as the wood board of the embodiment
Density and bending strength of plywood having
And the bending Young's modulus were measured. As a result, the density is
0.55g / cm Three, Bending strength is 547 kg / cmTwo, Song
The Young's modulus is 45t / cmTwoMet. These results
Therefore, the wood board of the present invention has a density equal to or less than that of plywood.
And has bending strength almost comparable to plywood
You can see that.
【００２５】[0025]
【発明の効果】以上説明したように請求項１の木質板に
あっては、厚さの絶対値が０．０５〜０．５０ｍｍの木
材薄片をバインダー樹脂により接着一体化されたことに
より、用いる木材薄片が１種類で済むので、木質板を製
造するための装置数を減らすことができるうえ製造工程
の簡略化が可能で、これによって木質板の製造効率を向
上させることができる。さらに、請求項１の木質板にお
いては、芯層と表面層に用いる木材薄片の厚さの範囲が
同じでものであるので、芯層と表面層が均一であり、し
かも木材薄片の厚みの絶対値が０．０５〜０．５０ｍｍ
と狭い範囲であるのでバラツキが小さく、従って表面及
び木口面の平滑性が優れており、木質板の角部を削って
孔が生じることを低減できるので木口面上に化粧板を貼
着し易く、しかも化粧板に凹部が現出するのを低減でき
る。As described above, in the wood board according to the first aspect of the present invention, a thin wood piece having an absolute value of 0.05 to 0.50 mm is bonded and integrated with a binder resin to be used. Since only one kind of wood slice is required, the number of apparatuses for manufacturing the wood board can be reduced, and the manufacturing process can be simplified, thereby improving the manufacturing efficiency of the wood board. Further, in the wood board of claim 1, since the thickness range of the wood flakes used for the core layer and the surface layer is the same, the core layer and the surface layer are uniform and the absolute value of the thickness of the wood flakes Is 0.05 to 0.50 mm
Because it is a narrow range, the variation is small, so the surface and the edge of the wood edge are excellent, and it is possible to reduce the occurrence of holes by cutting the corners of the wooden board, so that it is easy to stick the decorative board on the wood edge In addition, the appearance of the concave portion on the decorative plate can be reduced.
【００２６】また、請求項２の木質板にあっては、上記
木材薄片として幅の絶対値が１．００〜５０．００ｍｍ
の範囲のものを用いたことにより、木材薄片のカールや
折れ曲がりを防止できるため、バインダー樹脂との混合
時にバインダー樹脂が木材薄片に均一に付着し易く、し
かも成形時の空気の抜けが良好でボイド（泡）の発生を
低減できるので、木材薄片の剥離を防止できるうえ木質
板の表面の平滑性を向上できる。また、請求項３の木質
板にあっては、上記バインダー樹脂が発泡性樹脂のみか
ら構成されたことにより、得られる木質板の密度を低く
設定することができ、しかも木材薄片により均一に塗布
でき、剛性を向上させることができる。さらに、バイン
ダーの構成材料が少ないので、木材薄片にバインダーを
塗布する装置内のバインダー吐出用ノズル数を減らすこ
とができ、これによってバインダー塗布装置の簡素化が
可能であり、バインダー塗布作業効率が向上する。According to the second aspect of the present invention, the absolute value of the width of the thin wood piece is 1.00 to 50.00 mm.
Since the curl and bending of the wood flakes can be prevented by using those in the range, the binder resin easily adheres to the wood flakes uniformly when mixed with the binder resin, and the air escape during molding is good, and the voids are good. Since the generation of (bubbles) can be reduced, peeling of the thin wood pieces can be prevented, and the smoothness of the surface of the wooden board can be improved. According to the third aspect of the present invention, the density of the obtained wood board can be set low, and the wood board can be evenly applied by using the foam resin as the binder resin. , Rigidity can be improved. In addition, since the constituent material of the binder is small, the number of nozzles for ejecting the binder in the apparatus for applying the binder to the wood flakes can be reduced, thereby simplifying the binder application apparatus and improving the efficiency of the binder application operation. I do.
【００２７】また、請求項４の木質板にあっては、バイ
ンダー樹脂としてＰＭＤＩからなるものを用いたことに
より、熱圧成形時の温度を下げることができ、時間も短
くて済むので熱圧工程を短縮できる。また、ＰＭＤＩを
バインダー樹脂として用いたことにより、上述のように
成形温度が低温であるので離形剤の分解を押さえること
ができ、圧力定盤・コールプレートとの離形性が良好
で、成形作業効率が向上する。また、請求項５の木質板
にあっては、上記木材薄片を予めアセチル化したものを
用いたことにより、耐水性を向上でき、寸法安定性を向
上させることができる。According to the fourth aspect of the present invention, the temperature at the time of hot pressing can be reduced and the time can be shortened by using PMDI as the binder resin. Can be shortened. In addition, by using PMDI as a binder resin, the molding temperature is low as described above, so that the decomposition of the release agent can be suppressed, and the releasability from the pressure platen / cold plate is good, and Work efficiency is improved. Further, in the case of the woody board according to the fifth aspect, by using the above-mentioned wood flakes which have been acetylated in advance, the water resistance can be improved and the dimensional stability can be improved.
Claims (5)
の木材薄片がバインダー樹脂により接着一体化されてな
ることを特徴とする木質板。1. An absolute value of a thickness of 0.05 to 0.50 mm
A wooden board characterized in that a thin piece of wood is bonded and integrated with a binder resin.
５０．００ｍｍであることを特徴とする請求項１記載の
木質板。2. The absolute value of the width of the thin wood piece is 1.00 to 2.
The wooden board according to claim 1, which is 50.00 mm.
るものであることを特徴とする請求項１又は２記載の木
質板。3. The wooden board according to claim 1, wherein the binder resin is made of a foamable resin.
フェニル・ジイソシアネートであることを特徴とする請
求項３記載の木質板。4. The wood board according to claim 3, wherein said binder resin is polymethylene diphenyl diisocyanate.
のであることを特徴とする請求項１〜４のいずれかに記
載の木質板。5. The wood board according to claim 1, wherein said wood flakes are acetylated in advance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9215302A JP3050177B2 (en) | 1997-08-08 | 1997-08-08 | Wood board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9215302A JP3050177B2 (en) | 1997-08-08 | 1997-08-08 | Wood board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1158332A true JPH1158332A (en) | 1999-03-02 |
| JP3050177B2 JP3050177B2 (en) | 2000-06-12 |
Family
ID=16670079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9215302A Expired - Lifetime JP3050177B2 (en) | 1997-08-08 | 1997-08-08 | Wood board |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3050177B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013123904A (en) * | 2011-12-16 | 2013-06-24 | Okura Ind Co Ltd | Particle board |
-
1997
- 1997-08-08 JP JP9215302A patent/JP3050177B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013123904A (en) * | 2011-12-16 | 2013-06-24 | Okura Ind Co Ltd | Particle board |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3050177B2 (en) | 2000-06-12 |
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