JP2005297500A - Timber impregnation agent composition imparting durability and dimensional stability to timber, and manufacturing method - Google Patents

Timber impregnation agent composition imparting durability and dimensional stability to timber, and manufacturing method Download PDF

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JP2005297500A
JP2005297500A JP2004120980A JP2004120980A JP2005297500A JP 2005297500 A JP2005297500 A JP 2005297500A JP 2004120980 A JP2004120980 A JP 2004120980A JP 2004120980 A JP2004120980 A JP 2004120980A JP 2005297500 A JP2005297500 A JP 2005297500A
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wood
timber
dimensional stability
citric acid
durability
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Yoshiro Tsujimoto
本 芳 郎 辻
Yoshitaka Tateiwa
岩 芳 隆 立
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NINOMIYA NOSAN KK
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a composition related to the development of a timber impregnation agent which is constituted of a natural raw material and a food material in order to increase the durability and the dimensional stability of timber, and a timber processing technique of impregnation. <P>SOLUTION: This composition constituted of a persimmon juice liquid and a citric acid is impregnated into a timber, and thus, durability such as anti-corrosion and insect control, and dimensional stability are realized. In addition, by compressing the treated material, the impregnation treatment contributes to the increase of the durability and dimensional stability. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、柿渋の実から抽出採集された柿渋液と有機酸類のクエン酸を一定の割合で混合した水溶液を、木材注入方法の浸漬拡散法、温冷浴法、加圧減圧注入法で木材に浸漬注入することで、環境に負荷をかけない耐久性及び寸法安定性が向上した木材となる。 The present invention relates to an aqueous solution obtained by mixing a certain amount of a persimmon juice extracted and collected from a persimmon fruit and an organic acid citric acid by a dip diffusion method, a hot / cold bath method, and a pressure-reduced pressure injection method. By soaking and injecting into the wood, it becomes a wood with improved durability and dimensional stability that does not place a burden on the environment.

上記の柿渋液とクエン酸の混合した水溶液を注入した木材を、表面圧縮することで更なる耐久性及び寸法安定性を得ることができる。 Further durability and dimensional stability can be obtained by surface-compressing the wood into which the above-mentioned mixed solution of persimmon astringent liquid and citric acid is injected.

木材の防腐、防虫処理剤として注入剤、塗布剤として使用されていたものは、タール系のクレオソート油、フェノール系ベンタクロルフェニルラウレート、トリプロルフェノール、キノリン系B−オキシキノリン剤、ナフテン酸系ナフテン酸剤、有機スズ系トリプチルスズオキシド、有機ヨウ素系クロルフェニル、ヨードプロパルギルホルマール、クロム・銅・ヒ素系、フェノールフッ素系、ホウ砂・ホウ酸等で、有害な物質を主成分としている物であることから、環境への影響が課題とされている。 For wood preservatives and insect repellents, injections and coatings used were tar creosote oil, phenolic bentachlorphenyl laurate, triprolphenol, quinoline B-oxyquinoline, naphthenic acid -Based naphthenic acid agent, organotin triptyltin oxide, organoiodine chlorophenyl, iodopropargyl formal, chromium, copper, arsenic, phenol fluorine, borax, boric acid, etc. Because it is a product, its impact on the environment is an issue.

木材の圧縮加工は従来から広く行われ、圧縮加工木材として流通しているが、柿渋液注入木材、柿渋液とクエン酸混合液の注入木材を圧縮加工した木材製造物は無かった。 Although compression processing of wood has been widely performed and distributed as compressed processing wood, there has been no wood product that has been compression-processed with wood-buckle liquid-injected wood or wood-wood juice and citric acid mixed wood.

従来の技術の現状から、本発明は、木材の防腐、防虫、耐久性を目的とした処理剤において、製造時や施工使用時に環境に負荷をかけない製品であり、安全な自然素材の柿渋や食品原料であるクエン酸の混合組成物で、木材注入処理剤を提供することにある。そして、注入処理木材を圧縮加工することで更なる防腐、防虫、耐久性が向上することを付与するものである。 From the current state of the art, the present invention is a treatment agent for antiseptic, insectproof, and durability of wood, which is a product that does not place an environmental burden during manufacturing or construction use, An object of the present invention is to provide a wood injection treatment agent with a mixed composition of citric acid as a food material. And it gives that further antiseptic | preservation, insect repellent, and durability improve by compressing injection-processed wood.

本発明は自然素材の柿渋と食品原料のクエン酸を一定の割合で混合した組成物を木材に注入することで、防腐、防虫、耐久性、寸法安定性を実現することができる。柿渋は日本古来より防腐剤、防虫剤として使用されている。そして、クエン酸は柿渋と混合し木材中に固着させることで、特に防虫効果を向上させる物質である。 The present invention can achieve antiseptic, insect-proofing, durability, and dimensional stability by injecting into a wood a composition obtained by mixing a certain amount of natural raw material astringency and citric acid, which is a raw material of food, into a certain ratio. Persimmon Shibu has been used as an antiseptic and insect repellent since ancient times in Japan. Citric acid is a substance that improves the insect repellent effect, especially by mixing with persimmon and fixing it in wood.

柿渋とクエン酸の混合組成物を注入した木材を乾燥状態とし圧縮することで、木材表面の密度を高めることとなり、木材表面強度を向上させることで、耐久性、防腐、防虫性能を向上させる。また、柿渋は高分子の縮合体で、乾燥させることでプラスチック化し、木材全体の耐久性を高め、更に圧縮することで木材表面が固化する。 The wood infused with the mixed composition of persimmon and citric acid is dried and compressed to increase the density of the wood surface, and the strength of the wood surface is improved to improve durability, antiseptic and insect repellent performance. In addition, persimmon astringent is a polymer condensate, which is made into a plastic by drying, improves the durability of the whole wood, and further compresses the wood surface to solidify.

本発明を、詳細な説明において、用途、適応範囲を正しく示す。また、本発明の詳細な説明で処理木材の種類、形状、形態等は限定されない。 In the detailed description, the present invention correctly indicates the application and the applicable range. Moreover, the kind, shape, form, etc. of the treated wood are not limited in the detailed description of the present invention.

本発明で使用する注入剤組成物の柿渋液は水溶性で、温度変化にも変質せず、250℃の高温においても品質を保っているものである。化学特性は、カテキンガレート、ガロカテキンガレート、カテキン等のタンニン類で構成された、分子量約15,000前後の高分子縮合体であり、気乾状態ではプラスチック化となる。また、酵素の抑制、酸化抑制効果、脂質過酸化の抑制、還元作用、抗菌作用、脱臭作用といった特性を有する。 The drenched astringent liquid of the injectable composition used in the present invention is water-soluble, does not change with temperature change, and maintains quality even at a high temperature of 250 ° C. The chemical property is a polymer condensate composed of tannins such as catechin gallate, gallocatechin gallate, catechin and the like, and has a molecular weight of about 15,000. In addition, it has properties such as enzyme inhibition, oxidation inhibition effect, lipid peroxidation inhibition, reducing action, antibacterial action, and deodorizing action.

柿渋の従来の利用方法として、竹、紙、魚網、布、木に対して塗布することで、材質の補強、防腐、防虫、防水性の向上に利用されていた。現在では、シックハウス物質のホルムアルデヒドの除去、臭気物質のアンモニア、トリメチルアミンや、ニコチンの除去等が化学的に明らかになっていることから、柿渋注入木材を居住室内に使用すれば良好な環境を維持することができる。また、柿渋注入木材は、淡赤色、淡黒色となり、銘木のチーク材、シタン材、神代杉調の仕上りになる。 As a conventional method of using strawberry astringency, it has been used for reinforcement of materials, antiseptic, insectproof, and waterproofing properties by applying to bamboo, paper, fishnet, cloth and wood. At present, the removal of formaldehyde as a sick house substance, the removal of ammonia, trimethylamine, and nicotine as odorous substances has been clarified chemically. be able to. In addition, the amber-injected wood is light red and light black, and is finished with teak wood, rosewood, and Kojiro cedar tone.

本発明で使用する注入剤組成物のクエン酸は結晶性有機酸で、酸度は弱く酢酸の1/3程度で、梅干し、レモン等に含まれる物質である。現在はデンプンを原料とし、これを醗酵させ生産されている。物性は、外観形状は白色又は無色の結晶で、分子量210、融点130〜150℃で、水に対する溶解度は高く、20℃では60%、100℃では80%であり、弱アルカリ性の無害物質である。 Citric acid of the injectable composition used in the present invention is a crystalline organic acid, which is weak in acidity and about 1/3 of acetic acid, and is a substance contained in dried plums, lemons and the like. Currently, starch is used as a raw material and is fermented. The appearance is white or colorless crystals with a molecular weight of 210, melting point of 130 to 150 ° C., high solubility in water, 60% at 20 ° C. and 80% at 100 ° C., and is a weak alkaline harmless substance. .

結晶性有機酸で無害のクエン酸と同等の物質として、アスコルビン酸、アスパラギン酸、グルタミン酸、クエン酸回路中のアコニット酸、イソクエン酸、α−ケトグルタル酸、コハク酸、フマール酸、リンゴ酸、オキザロ酢酸等が注入剤組成物として使用することができるが、安価で安定している有機酸としてクエン酸が最適である。 Crystalline organic acids that are harmless to citric acid are ascorbic acid, aspartic acid, glutamic acid, aconitic acid in citric acid cycle, isocitric acid, α-ketoglutaric acid, succinic acid, fumaric acid, malic acid, oxaloacetic acid Can be used as an injectable composition, but citric acid is most suitable as an inexpensive and stable organic acid.

本発明では、常温の柿渋液に粒状又は粉体状のクエン酸を、柿渋液1重量部に対して2〜15%を投入して混合する方法や、一部柿渋液に最終割合のクエン酸を投入し100℃程度まで温め十分に混合されたものを再度柿渋液に投入して作る方法でも良いが、混合液を一時的に温める方法が最良である。柿渋液のタンニン等が熱に強い性質で変質しない特性から有効且つ安定した品質の組成物が得られる。 In the present invention, granular or powdered citric acid is added to room temperature persimmon juice at a ratio of 2 to 15% with respect to 1 part by weight of persimmon astringent liquid, or the final ratio of citric acid is partially mixed in persimmon astringent liquid. It is possible to use a method in which the mixture is warmed to about 100 ° C. and sufficiently mixed and then poured into the persimmon juice again, but the method of temporarily warming the mixture is the best. An effective and stable quality composition can be obtained from the property that tannin and the like of persimmon juice is resistant to heat and does not deteriorate.

柿渋液とクエン酸を組成物とした木材注入剤の特性は、高分子である柿渋液のゲル化防止及び木材中に注入しやすい分子量とする為の細分化、シロアリ等に対する防虫効果、木材中に拡散された上記組成物のクエン酸の再結晶化と柿渋のプラスチック化による防腐効果の向上、同難燃性等であり、自然素材物質で構成された組成物である。 The characteristics of wood injecting agent composed of persimmon astringent and citric acid are: prevention of gelation of persimmon astringent, which is a polymer, fragmentation to make it easy to inject into wood, insect repellent effect on termites, It is a composition composed of natural material, such as improved antiseptic effect due to recrystallization of citric acid and plasticization of persimmons, flame retardancy, etc.

上記の柿渋液とクエン酸組成物の特性について具体的に説明する。ゲル化の防止について、柿渋の分子量は15000前後であることから、木材注入時の木材中の浸入拡散にばらつきがあったが、クエン酸による分子量の細分化により改善された。また、柿渋の長期保存にも有効である。シロアリ等に対する防虫効果について、クエン酸が注入された木材中で、木材の乾燥時に再結晶化することで長期にアルカリ性を維持し、更に柿渋液が同乾燥時にプラスチック化することで、結晶化したクエン酸を木材中から流出、発散させなくする。また、防腐性にも付与する、木材全体の密度が高まり、木材中に水分、腐朽菌の浸入を防ぐと同時に難燃性も維持することが特徴である。よって、柿渋液とクエン酸組成物で注入処理された木材は、耐久性、寸法安定性が向上し、国産杉材及び同間伐材等の利用促進に寄与するものである。 The characteristics of the persimmon astringent solution and the citric acid composition will be specifically described. Regarding the prevention of gelation, the molecular weight of persimmon astringent was around 15000, so there was variation in the infiltration and diffusion in the wood during the pouring of the wood, but it was improved by subdividing the molecular weight with citric acid. It is also effective for long-term storage of persimmons. Insect repellents against termites, etc., in the wood infused with citric acid, it retains alkalinity for a long time by recrystallizing when the wood is dried, and further, the persimmon juice liquid is crystallized by plasticizing at the same time of drying. Prevent citric acid from flowing out and emanating from wood. In addition, the density of the whole wood, which is also imparted to antiseptic properties, is increased, and the intrusion of moisture and decaying fungi into the wood is prevented while at the same time maintaining flame retardancy. Therefore, the wood that has been infused with persimmon juice and citric acid composition has improved durability and dimensional stability, and contributes to promoting the use of domestically produced cedar and thinned wood.

以上が本発明の請求項1に関する詳細な説明である。以下記載は請求項2に関するものとする。 The above is the detailed description regarding claim 1 of the present invention. The following description relates to claim 2.

柿渋液とクエン酸組成物を注入処理剤とし、注入された木材をプレート圧縮機、ロール圧縮機で木材の一面及び多面を圧縮することで、耐久性、寸法安定性の更なる向上を実現させることができる。 By using strawberry astringent solution and citric acid composition as an injection treatment agent, the injected wood is compressed on one side and many sides of the wood with a plate compressor and roll compressor, thereby further improving durability and dimensional stability. be able to.

一般的に注入処理木材でない無処理の木材に圧縮を加えた木製品は、家具等に対し広く生産され流通しているが、本発明の防腐、防虫、寸法安定性を目的とした注入剤で処理された圧縮木材は無く、本発明で実現した。 In general, wooden products made by compressing untreated wood that is not infused treated wood are widely produced and distributed for furniture, etc., but treated with the infusate of the present invention for the purpose of antiseptic, insecticidal and dimensional stability. There was no compressed wood that was made, and this was realized in the present invention.

柿渋液とクエン酸組成物で注入処理された木材を汎用の圧縮機で圧縮しても耐久性、寸法安定性の向上が図れるが、圧縮のプレス面に温度を加えることのできる圧縮機であれば更に良好な成果となる。そして、温度を加えるにあたって、柿渋液のタンニン等が高温でも変質しない性質から可能となる。 Even if wood that has been infused with astringent juice and citric acid composition is compressed with a general-purpose compressor, durability and dimensional stability can be improved, but the compressor can apply temperature to the pressing surface of the compression. Better results. And when adding temperature, it becomes possible from the property that the tannin etc. of persimmon astringent liquid do not change at high temperature.

圧縮機のプレス面の温度は150℃〜180℃が最適で、圧縮率は1%〜65%まで可能であるが、木材の特性である暖かさ等を損なわない範囲とすると20%〜30%の圧縮が良好である。そして、圧縮された木材表面は光沢があり美観も良好で、無塗装で十分に利用が可能であり、材質の柔らかい杉等の利用拡大に貢献する。 The temperature of the press surface of the compressor is optimally 150 ° C. to 180 ° C., and the compression rate can be 1% to 65%, but 20% to 30% if it is within the range that does not impair the warmth that is the characteristic of wood. The compression of is good. The compressed wood surface is glossy, has a good appearance, can be used without painting, and contributes to expanding the use of soft cedar.

柿渋液とクエン酸組成物で注入処理された木材及び更に圧縮処理された木材の利用範囲は、柔らかい杉材等であっても、柿渋による木材表面のプラスチック化等により、土木資材としての木製歩道、同通路、木製手摺り、屋外ステージ等から、建築資材として床材、同フローリング、内外装壁材、構造材全般、造作材等まで広く使用することができる。また、森林保護育成で発生する間伐材の利用の範囲、利用の拡大に貢献する。 The range of use of wood that has been infused with amber juice and citric acid composition and wood that has been further compressed is wooden pedestrians, etc. It can be widely used from the same passage, wooden handrails, outdoor stages, etc. to flooring materials, flooring, interior / exterior wall materials, general structural materials, construction materials, etc. as building materials. In addition, it contributes to the expansion of the scope and use of thinned wood generated by forest protection and cultivation.

以上が請求項2の柿渋液とクエン酸組成物の注入処理木材を圧縮処理することに関する説明と利用範囲を詳細に記載した。 The above has described in detail the explanation and application range related to the compression treatment of the wood-altered juice and the citric acid composition-treated wood of claim 2.

本発明の柿渋液とクエン酸を組成物とした木材注入剤及び圧縮加工技術の開発、改良で、例えば柿渋と撥水性、防腐性のあるヒノキ油及びヒバ油、ヤシ油との組成物、ヒノキ油及びヒバ油、ヤシ油とクエン酸との組成物等の天然油成分との組み合わせによる木材注入剤や、同注入処理木材の圧縮加工が新たな木材の利用拡大に続くものである。 Development and improvement of wood injection agent and compression processing technology comprising persimmon juice and citric acid composition of the present invention, for example, composition of persimmon astringency and water repellency, antiseptic cypress oil and hiba oil, coconut oil, cypress The use of wood injections in combination with natural oil components such as oil and Hiba oil, coconut oil and citric acid compositions, and compression processing of the injection-treated wood will continue to expand the use of new wood.

福井県産杉間伐材、厚さ22mmフローリング加工板材を、柿渋液10、水2の割合で作った柿渋水溶液とクエン酸5%の組成物をスチーム冷浴法で注入処理した木材をロールプレス機で厚さ18mmに圧縮し製品とした。尚、圧縮時の板材に対する温度は180℃とした。以上で生産されたフローリング加工杉板材40m2を県内工務店に納入し、その使用箇所は床材、一部内装壁材であった。 Roll press machine made of Fukui Prefecture cedar thinned wood, 22mm thick flooring processed wood, infused with a composition of 5% citric acid solution and 10% water solution made from water solution 10 and water 2 by steam cold bath method The product was compressed to a thickness of 18 mm. In addition, the temperature with respect to the board | plate material at the time of compression was 180 degreeC. The flooring processed cedar board material 40m 2 produced above was delivered to a construction company in the prefecture, and the place of use was flooring and some interior wall materials.

実施例1で製造した柿渋液とクエン酸組成物で注入圧縮処理された杉板材は、多少の割高ではあるが、杉材の暖かみ、消臭効果、ホルムアルデヒドの除去等シックハウス対策型であるとの評価から、施主、工務店共に同材の採用となった。尚、同使用で、公共工事の保育所、幼稚園、公共展示施設の設計採用となった。 The cedar board material injected and compressed with the persimmon juice produced in Example 1 and the citric acid composition is somewhat expensive, but it is a chic house countermeasure type such as warming of cedar, deodorizing effect, removal of formaldehyde, etc. From the evaluation, both the owner and the construction company adopted the same material. In addition, the use resulted in the design and adoption of nursery schools, kindergartens and public exhibition facilities for public works.

柿渋液10、水2及び4の割合で各混合柿渋水溶液とクエン酸2%の組成物を奈良県吉野産杉、檜の突板厚さ1.2mm、2mm、2.5mm、3mmに対し、スチーム冷浴法により注入処理し、4寸角集成柱材のサンプル製作を実施した。尚、集成材の芯材は、福井県産杉間伐材及び同産松、カナダ産白松、北海道産トド松(エゾ松)を使用し、展示用の参考品とした。 Steamed astringent water solution and water 2 and 4 in a ratio of 2% and 4% of each mixed water solution and citric acid were steamed against Yoshino cedar from Nara Prefecture, and veneer veneer thicknesses of 1.2mm, 2mm, 2.5mm and 3mm. Injection treatment was performed by a cold bath method, and a sample of a 4-inch square laminated pillar material was manufactured. The core material of the laminated timber was cedar thinned from Fukui Prefecture, pine produced in Canada, white pine from Canada, and Todomatsu (Hokkaido) from Hokkaido.

国産の杉材、檜材及び同間伐材の利用拡大にあたり、シックハウス対策型、消臭効果、シロアリ等に対する防虫効果、安全性等の快適な居住室内環境に必要な条件を十分に満足していることから、展示会、説明会を実施した東京、大阪、福井では大きな反響を集めた。 In expanding the use of domestically produced cedar, timber and thinned timber, it fully satisfies the conditions necessary for a comfortable living room environment, such as a countermeasure against sick house, deodorant effect, insect repellent effect against termites, safety, etc. Therefore, there was a great response in Tokyo, Osaka and Fukui where exhibitions and briefings were held.

柿渋液10、水2の割合で混合された柿渋水溶液とクエン酸7%の組成物を福井県産杉間伐材の円柱加工材及び幕板に注入処理し、木棚用とし電力会社に納入した。採用の条件となった防腐、防虫、自然環境への安全性を十分に満たしていたからであった。同製品は使用後の処分においてもチップ化するなど再利用が可能であることも特徴である。 The composition of persimmon water solution and citric acid 7% mixed in the ratio of persimmon astringent liquid 10 and water 2 was injected into the cylindrical processed material and curtain of cedar thinned wood from Fukui Prefecture, and delivered to the power company for wooden shelves. . This was because the antiseptic, insect-proofing, and safety to the natural environment, which were the conditions for adoption, were sufficiently satisfied. The product is also characterized by its ability to be reused, for example, by chipping it after disposal.

上記の仕様注入処理木材で追加の発注、また木製階段、花壇の製作に至った。土木資材としての利用も有望で、間伐材の利用促進に寄与する。
Additional orders were made for the above-mentioned injection-treated wood, and wooden stairs and flower beds were produced. Use as a civil engineering material is also promising and contributes to the promotion of the use of thinned wood.

Claims (2)

木材の耐久性及び寸法安定性の向上において、タンニン類を主成分とする柿渋と、クエン酸を一定の割合で混合した水溶液を、木材防腐、防虫処理方法の浸漬拡散法、温冷浴法、加圧減圧法で木材に注入することで、環境に負荷をかけず、住環境の健全化に付与することを特徴とする、柿渋とクエン酸の組成物及び製造方法。 In improving the durability and dimensional stability of the wood, an aqueous solution containing tannins as a main component and citric acid mixed in a certain ratio is used as a wood preservative, insect diffusion treatment immersion diffusion method, hot and cold bath method, A composition and a production method of persimmon astringent and citric acid, which are imparted to the soundness of the living environment without inflicting the environment by injecting into wood by a pressure-reduced pressure method. 木材の耐久性及び寸法安定性の向上において、請求項1の柿渋とクエン酸の組成物及び製造方法の、防腐、防虫処理木材の木材表面に圧縮を加えることで、木質の柔らかい杉材等に耐久性、寸法安定性、美観を付与することを特徴とする圧縮加工木材の製造方法。
In improving the durability and dimensional stability of wood, by applying compression to the wood surface of the antiseptic and insect-proof treated wood according to the composition and manufacturing method of persimmon and citric acid according to claim 1, it is possible to produce a soft woody cedar material, etc. A method for producing compressed wood characterized by imparting durability, dimensional stability, and aesthetics.
JP2004120980A 2004-04-16 2004-04-16 Timber impregnation agent composition imparting durability and dimensional stability to timber, and manufacturing method Pending JP2005297500A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008115352A (en) * 2006-10-12 2008-05-22 Sumitomo Forestry Co Ltd High water-resistant resin layer-forming agent
JP2008119893A (en) * 2006-11-09 2008-05-29 Sekisui House Ltd Highly functional interior finish material
JP2009007498A (en) * 2007-06-28 2009-01-15 Sumitomo Forestry Co Ltd Composition for highly weather-resisting coating material
JP2019034420A (en) * 2017-08-10 2019-03-07 アートフォルム有限会社 Manufacturing method of processed wood, and processed wood obtained by the same

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008115352A (en) * 2006-10-12 2008-05-22 Sumitomo Forestry Co Ltd High water-resistant resin layer-forming agent
JP4648299B2 (en) * 2006-10-12 2011-03-09 住友林業株式会社 High water resistant resin layer forming agent
JP2008119893A (en) * 2006-11-09 2008-05-29 Sekisui House Ltd Highly functional interior finish material
JP4743087B2 (en) * 2006-11-09 2011-08-10 積水ハウス株式会社 High performance interior materials
JP2009007498A (en) * 2007-06-28 2009-01-15 Sumitomo Forestry Co Ltd Composition for highly weather-resisting coating material
JP2019034420A (en) * 2017-08-10 2019-03-07 アートフォルム有限会社 Manufacturing method of processed wood, and processed wood obtained by the same
JP6999917B2 (en) 2017-08-10 2022-01-19 アートフォルム有限会社 Manufacturing method of processed wood

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