JP4917367B2 - Wood board drying treatment method - Google Patents

Wood board drying treatment method Download PDF

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JP4917367B2
JP4917367B2 JP2006193450A JP2006193450A JP4917367B2 JP 4917367 B2 JP4917367 B2 JP 4917367B2 JP 2006193450 A JP2006193450 A JP 2006193450A JP 2006193450 A JP2006193450 A JP 2006193450A JP 4917367 B2 JP4917367 B2 JP 4917367B2
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JP2008018643A (en
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光 佐々木
透 山口
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Wood One Co Ltd
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Description

本発明は、木質板の乾燥処理方法に関するものである。より詳しくは、熱板プレスを用いて木質板を乾燥させ、さらに材質改良を行う乾燥処理方法に関するものである。   The present invention relates to a method for drying a wood board. More specifically, the present invention relates to a drying method for drying a wooden board using a hot plate press and further improving the material.

従来、建築材料等に用いる木質板を乾燥処理するために、乾燥機を用いた乾燥処理が行われてきた。また、エネルギー効率や乾燥時間などを向上させるために、極薄い単板に、熱圧プレスを用いて乾燥処理を行うことが試みられてきた。
しかし、熱板プレスを用いた単板の乾燥処理を行う場合には、急激な加熱により大量に発生する蒸気をいかに外部に放出するかが問題となっている。 Conventionally, a drying process using a dryer has been performed in order to dry a wooden board used for building materials and the like. In order to improve energy efficiency, drying time, etc., it has been attempted to perform a drying process on a very thin single plate using a hot press.
However, when a single plate is dried using a hot plate press, the problem is how to release a large amount of vapor generated by rapid heating to the outside.

これに対する対応策として、適当な時間間隔でプレスを軽く開き、内部の蒸気を放散する、いわゆる「息抜き」が行われている。   As a countermeasure against this, so-called “breathing” is performed in which the press is lightly opened at appropriate time intervals to dissipate the internal vapor.

また、他の対応策として、特許文献１には、熱板と単板類の間に「蒸気逃し用部材」を挿入して、蒸気を放出する発明が開示されている。
図９は、「蒸気逃し用部材」を用いた熱板プレスに単板を挿入した状態を示す正面図である。熱板プレスの２枚の熱板６０ａ，６０ｂの間に単板５０が挿入されており、さらに熱板６０ａ，６０ｂと単板５０の間に蒸気逃し用部材７０ａ，７０ｂが挿入されている。
蒸気逃し用部材７０ａ，７０ｂは、熱の伝導がほとんど阻害されず、蒸気の通過が可能な特殊なメッシュにより形成されており、熱圧時に単板５０の表面から蒸気を放出できるようになっている。
特開昭６２−２９９６８９号公報 As another countermeasure, Patent Document 1 discloses an invention in which a “steam escape member” is inserted between a hot plate and a single plate to release steam.
FIG. 9 is a front view showing a state where a single plate is inserted into a hot plate press using a “steam escape member”. A single plate 50 is inserted between the two hot plates 60 a and 60 b of the hot plate press, and steam escape members 70 a and 70 b are inserted between the hot plates 60 a and 60 b and the single plate 50.
The steam escape members 70a and 70b are formed of a special mesh that allows almost no heat conduction and allows steam to pass therethrough, so that steam can be discharged from the surface of the veneer 50 at the time of hot pressure. Yes.
JP-A-62-299689

しかし、上記の「息抜き」を行う方法を厚みのある木質板に用いると、熱板より遠く、相対的に低温となる木質板の中層に高圧の蒸気が集まり、息抜き時に圧締圧（プレスの圧力）を瞬間的に開放するだけでも、木質板内部で蒸気の急激な膨張が起こり、木質板を内部から爆砕することになってしまう。
従って、この方法では、熱板の温度を極端に高くすることはできない。また、木質板の厚さも厚くすることができず、通常その適用範囲は１ｍｍ以下の薄い板に限られてしまう。 However, if the above-mentioned “breathing” method is used for a thick wooden board, high-pressure steam gathers in the middle layer of the wooden board, which is far from the hot plate and is relatively low in temperature, and the pressing pressure (press of the press) Even if the pressure is released momentarily, the steam will rapidly expand inside the wooden board, and the wooden board will be crushed from the inside.
Therefore, with this method, the temperature of the hot plate cannot be extremely increased. In addition, the thickness of the wooden board cannot be increased, and the application range is usually limited to a thin board of 1 mm or less.

一方、熱板と木質板の間に「蒸気逃し用部材」を挿入する方法の場合には、乾燥中に圧締圧（プレスの圧力）を緩めなくてもよいため、熱板温度を多少高めても、木質板が爆砕する心配はない。従って、木質板の厚さ方向の水分傾斜が許容範囲内に低下するまで、時間をかけて熱圧し続けさえすれば、木質板の乾燥割れを避けることができる。
しかし、この場合も、木質板の中層に集まっている蒸気を木質板の表面から放散させることに変わりはないため、木質板が厚くなればなるほど乾燥時間が長くなり、効率が悪くなってしまう。 On the other hand, in the case of the method of inserting the “steam escape member” between the hot plate and the wood plate, it is not necessary to loosen the pressing pressure (press pressure) during drying. There is no worry that the wooden board will explode. Therefore, dry cracking of the wooden board can be avoided if the hot pressing is continued over a period of time until the moisture gradient in the thickness direction of the wooden board falls within the allowable range.
However, in this case as well, the steam collected in the middle layer of the wooden board is still dissipated from the surface of the wooden board. Therefore, the thicker the wooden board, the longer the drying time and the lower the efficiency.

そこで本発明は、上記従来の課題を解決するためのものであり、木質板の厚さや熱板の温度が制限されることなく乾燥時間の短縮が図れると同時に、木質板の材質改良を連続的に行うことのできる木質板の乾燥処理方法を提供するものである。   Therefore, the present invention is to solve the above-described conventional problems, and can reduce the drying time without limiting the thickness of the wooden board and the temperature of the hot board, and at the same time, continuously improve the quality of the wooden board. The present invention provides a method for drying a wooden board that can be carried out in a simple manner.

上記従来の課題を解決するために、請求項１に係る発明の木質板の乾燥処理方法は、木質板（１０）に、その少なくとも１つの端面（３）へと連通するように空間部（８）を形成する木質板加工工程（１００）と、前記木質板（１０）を熱板プレスの間に挿入し、前記熱板プレスにより前記木質板（１０）を熱圧して乾燥する熱圧乾燥工程（２００）とを有し、前記熱圧によって前記木質板（１０）の内部に発生した蒸気を前記空間部（８）から前記木質板（１０）の端面（３）に向けて放出させるように、前記空間部（８）を熱圧乾燥時に発生する蒸気の逃げ道としたことを特徴とする。 In order to solve the above-described conventional problems, the wood board drying method according to the first aspect of the present invention provides a space portion (8) that communicates with the wood board (10) to at least one end face (3) thereof. ) Forming a wood board processing step (100), and the wood board (10) is inserted between hot plate presses, and the wood plate (10) is hot-pressed and dried by the hot plate press. (200) possess a so as to release toward the end face (3) of the wood board (10) the steam generated in the interior of the wood board by the heat pressure (10) from the space (8) The space (8) is an escape path for steam generated during hot-pressure drying .

また、請求項２に係る発明は、木質板（１０）に、その少なくとも１つの端面（３）へと連通するとともに前記木質板（１０）の表裏面の一方（２）に連通又は近接させるようにして空間部（８）を形成する木質板加工工程（１００）と、前記木質板（１０）を熱板プレスの間に挿入し、前記熱板プレスで前記木質板（１０）の表裏面の他方（１）から熱圧して乾燥する熱圧乾燥工程（２００）とを有し、前記熱圧によって前記木質板（１０）の内部に発生した蒸気を前記空間部（８）から前記木質板（１０）の端面（３）に向けて放出させるように、前記空間部（８）を熱圧乾燥時に発生する蒸気の逃げ道としたことを特徴とする。 In the invention according to claim 2, the wood board (10) communicates with at least one end face (3) and communicates with or closes to one of the front and back surfaces (2) of the wood board (10). The wood board processing step (100) for forming the space portion (8) and the wood board (10) are inserted between hot plate presses, and the hot plate press is used for the front and back surfaces of the wood board (10). And a hot-pressure drying step (200) for drying by heat-pressing from the other (1), and steam generated in the wood board (10) by the heat pressure from the space (8) to the wood board ( The space (8) is used as an escape path for steam generated during hot-pressure drying so as to be discharged toward the end face (3) of 10) .

また、請求項３に係る発明の木質板の乾燥処理方法は、木質板（１０）の裏側（２）から厚さ方向中心に向けて、かつ少なくとも１つの端面（３）へと連通するように溝部（７）を形成する木質板加工工程（１００）と、前記溝部（７）を形成した木質板（１０）を２枚用意し、前記２枚の木質板（１０ａ，１０ｂ）の裏側（２ａ，２ｂ）同士を向かい合わせるとともに、一方の木質板（１０ａ）の表側（１ａ）を上向きに、他方の木質板（１０ｂ）の表側（１ｂ）を下向きにした状態で、上下２枚の熱板（２０ａ，２０ｂ）を有する熱板プレスの間に挿入し、前記熱板プレスにより前記２枚の木質板（１０ａ，１０ｂ）を熱圧して乾燥する熱圧乾燥工程（２００）とを有することを特徴とする。   Moreover, the drying treatment method for a wood board according to the invention of claim 3 communicates from the back side (2) of the wood board (10) toward the center in the thickness direction and to at least one end face (3). Two wood board processing steps (100) for forming the groove (7) and two wood boards (10) on which the groove (7) is formed are prepared, and the back side (2a) of the two wood boards (10a, 10b) , 2b) facing each other, with the front side (1a) of one wooden board (10a) facing up and the front side (1b) of the other wooden board (10b) facing down, two upper and lower hot plates A hot-pressure drying step (200) that is inserted between hot-plate presses having (20a, 20b) and hot-presses and dries the two wood boards (10a, 10b) with the hot-plate press. Features.

また、請求項４に係る発明は、請求項１乃至請求項３のうちいずれか一つに記載の発明において、前記熱圧乾燥工程（２００）において、前記木質板（１０）に１０〜３０％の範囲内の圧縮ひずみを与えながら熱圧して乾燥させることを特徴とする。   The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein in the hot-pressure drying step (200), the wood board (10) is 10% to 30%. It is characterized by being dried by hot pressing while applying a compressive strain within the range of.

また、請求項５に係る発明は、請求項１乃至請求項４のうちいずれか一つに記載の発明において、前記熱圧乾燥工程（２００）の後、さらに熱板（２０）で熱圧を続けて前記木質板（１０）の寸法安定性を向上させる寸法安定化工程（３００）を設けたことを特徴とする。   The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein after the hot-pressure drying step (200), the hot plate (20) is further used to apply hot pressure. Subsequently, a dimensional stabilization step (300) for improving the dimensional stability of the wood board (10) is provided.

また、請求項６に係る発明は、請求項５に記載の発明において、前記寸法安定化工程（３００）で前記木質板（１０）の寸法安定性を向上させた後、寸法安定化後の木質板（１０）に漂白液又は調色液を塗布し熱板（２０）の余熱で熱圧して前記木質板（１０）の色を調整する色調整工程（４００）を設けたことを特徴とする。   The invention according to claim 6 is the invention according to claim 5, wherein after the dimensional stability of the wooden board (10) is improved in the dimensional stabilization step (300), the timber after the dimensional stabilization is performed. A color adjusting step (400) is provided in which a bleaching solution or a color-adjusting solution is applied to the plate (10) and heat-pressed with the residual heat of the hot plate (20) to adjust the color of the wooden board (10). .

なお、括弧内の記号は、発明を実施するための最良の形態および図面に記載された対応要素または対応事項を示す。   The symbols in parentheses indicate the best mode for carrying out the invention and the corresponding elements or the corresponding matters described in the drawings.

請求項１に記載の発明によれば、木質板加工工程で、木質板に、その少なくとも１つの端面へと連通するように空間部を形成するので、この空間部を熱圧乾燥時に発生する蒸気の逃げ道とすることができる。そして、熱圧乾燥工程で熱板プレスにより木質板を熱圧して乾燥することができる。   According to the first aspect of the present invention, in the wood board processing step, the space portion is formed in the wood board so as to communicate with at least one end face thereof. It can be a way to escape. And a wooden board can be hot-pressed and dried with a hot-plate press at a hot-pressure drying process.

また、請求項２に記載の発明によれば、請求項１に記載の発明の作用効果に加えて、空間部を木質板の表裏面の一方に連通又は近接させて形成するとともに、熱板プレスで木質板の表裏面の他方から熱圧するので、蒸気の逃げ道である空間部を熱板プレスの熱板から遠い位置に配置することができる。そして、この状態で熱板プレスにより熱圧して乾燥するので、木質板内部に発生する蒸気は、熱板から遠い空間部に向けて移動し、連通した端面から放出される。従って、木質板の厚さや熱板の温度が制限されることなく、蒸気を適切に放出することができ、乾燥時間を短縮することができる。   According to the invention described in claim 2, in addition to the function and effect of the invention described in claim 1, the space portion is formed in communication with or close to one of the front and back surfaces of the wooden board, and the hot plate press Since the heat pressure is applied from the other side of the front and back surfaces of the wooden board, the space that is the escape path of the steam can be arranged at a position far from the hot plate of the hot plate press. And in this state, since it heats and presses with a hot plate press and dries, the vapor | steam which generate | occur | produces inside a wooden board moves toward the space part far from a hot plate, and is discharge | released from the connected end surface. Therefore, the steam can be discharged appropriately without limiting the thickness of the wooden board and the temperature of the hot plate, and the drying time can be shortened.

また、請求項３に記載の発明によれば、木質板加工工程で、木質板の裏側から厚さ方向中心に向けて、かつ少なくとも１つの端面へと連通するように溝部を形成するので、この溝部を熱圧乾燥時に発生する蒸気の逃げ道とすることができる。
また、熱圧乾燥工程で、まず溝部を形成した２枚の木質板の裏側同士を向かい合わせるので、２枚の木質板を合わせた複合板の厚さ方向中心に、蒸気の逃げ道である溝部を配置することができる。そして、一方の木質板の表側を上向きに、他方の木質板の表側を下向きにした状態で、上下２枚の熱板を有する熱板プレスの間に挿入するので、蒸気の逃げ道である溝部を上下２枚の熱板から最も遠い位置に配置することができる。
この状態で熱板プレスにより熱圧して乾燥するので、木質板内部に発生する蒸気は、熱板と接する木質板の表側から、熱板から最も遠い裏側の溝部に向けて移動し、連通した端面から放出される。従って、木質板の厚さや熱板の温度が制限されることなく、蒸気を適切に放出することができ、乾燥時間を短縮することができる。 Further, according to the invention described in claim 3, in the wood board processing step, the groove is formed so as to communicate from the back side of the wood board toward the center in the thickness direction and to at least one end face. The groove portion can be used as an escape path for steam generated during hot-pressure drying.
Also, in the hot-pressure drying process, first, the back sides of the two wooden boards on which the grooves are formed face each other, so that a groove serving as a steam escape path is formed at the center in the thickness direction of the composite board including the two wooden boards. Can be arranged. And, with the front side of one wooden board facing up and the front side of the other wooden board facing down, it is inserted between hot plate presses having two upper and lower hot plates, so the groove that is the escape route for steam is It can be arranged at a position farthest from the upper and lower two hot plates.
In this state, it is dried by hot pressing with a hot plate press, so the steam generated inside the wooden plate moves from the front side of the wooden plate in contact with the hot plate to the groove on the back side farthest from the hot plate and communicates with the end face. Released from. Therefore, the steam can be discharged appropriately without limiting the thickness of the wooden board and the temperature of the hot plate, and the drying time can be shortened.

また、請求項４に記載の発明によれば、請求項１乃至請求項３のうちいずれか一つに記載の発明の作用効果に加えて、熱圧乾燥工程において、木質板に１０〜３０％の範囲内の圧縮ひずみを与えながら熱圧して乾燥させるので、木質板の乾燥割れを防止することができる。
すなわち、熱圧により木質板の表面に垂直方向の圧縮応力が加わると、木質板内部では、水平方向に拡がるように、ポアソン比に相当する量の横圧縮応力が生じる。一方、熱圧による乾燥過程においては、木質板内部で水平方向の収縮による引張応力が生じる。上記範囲内の圧縮ひずみのもとでは、これら２つの応力が相殺されるので、木質板の乾燥割れを防止することができるのである。 Moreover, according to invention of Claim 4, in addition to the effect of the invention as described in any one of Claims 1 thru | or 3, in a hot-pressure drying process, it is 10 to 30% to a wooden board. Thus, dry cracking of the wood board can be prevented because it is dried by hot pressing while applying a compressive strain within the range of.
That is, when a compressive stress in the vertical direction is applied to the surface of the wooden board due to the heat pressure, a lateral compressive stress corresponding to the Poisson's ratio is generated inside the wooden board so as to spread in the horizontal direction. On the other hand, in the drying process by hot pressure, tensile stress due to horizontal contraction occurs inside the wooden board. Under the compressive strain within the above range, these two stresses cancel each other, so that dry cracking of the wood board can be prevented.

また、請求項５に記載の発明によれば、請求項１乃至請求項４のうちいずれか一つに記載の発明の作用効果に加えて、熱圧乾燥工程の後、さらに熱板で熱圧を続けて木質板の寸法安定性を向上させる寸法安定化工程を設けたので、木質板の材質改良を連続的に行い、使用時に吸湿による寸法変化率等を改善することができる。   According to the invention described in claim 5, in addition to the operational effect of the invention described in any one of claims 1 to 4, after the hot-pressure drying step, the hot plate is further used for hot pressing. Since the dimensional stabilization process for improving the dimensional stability of the wooden board is provided, the material of the wooden board can be continuously improved to improve the dimensional change rate due to moisture absorption during use.

また、請求項６に記載の発明によれば、請求項５に記載の発明の作用効果に加えて、寸法安定化工程の後、寸法安定化後の木質板に漂白液又は調色液を塗布し熱板の余熱で熱圧して木質板の色を調整する色調整工程を設けたので、熱圧乾燥工程と寸法安定化工程で木質板の色調が暗褐色等に変化した場合に、漂白や染色を行って使用目的に合致した色に調整することができる。   According to the invention described in claim 6, in addition to the function and effect of the invention described in claim 5, after the dimension stabilization step, the bleaching solution or toning solution is applied to the wooden board after the dimension stabilization. Since there is a color adjustment process that adjusts the color of the wooden board by heat-pressing with the residual heat of the hot board, if the color of the wooden board changes to dark brown etc. in the hot-pressure drying process and the dimension stabilization process, It can be dyed and adjusted to a color that matches the intended use.

次に、図１乃至図６を参照して、本発明の実施形態１に係る木質板の乾燥処理方法について説明する。
図１は、実施形態１に係る木質板の乾燥処理方法を示す工程図である。実施形態１に係る木質板の乾燥処理方法は、木質板加工工程１００、熱圧乾燥工程２００、寸法安定化工程３００、及び色調整工程４００から構成されている。 Next, with reference to FIG. 1 thru | or FIG. 6, the drying processing method of the wooden board which concerns on Embodiment 1 of this invention is demonstrated.
FIG. 1 is a process diagram showing a wood board drying method according to the first embodiment. The wood board drying method according to the first embodiment includes a wood board processing step 100, a hot-pressure drying step 200, a dimension stabilization step 300, and a color adjustment step 400.

最初に木質板加工工程１００について説明する。木質板加工工程１００は、熱板プレスで乾燥処理を行う前に、事前に木質板を加工処理するものである。
図２及び図３はともに、木質板加工工程１００で加工処理を行った後の木質板１０を示す斜視図である。
木質板１０は、表側１、裏側２、端面３，４及び側面５，６の６面から構成された板材である。そして、木質板加工工程１００では、木質板１０の裏側２から厚さ方向中心に向けて溝７を形成する。溝７は、端面３から端面４へと連通するように形成されており、裏側２の面が閉じられた場合であっても、端面３から端面４まで通ずるようになっている。 First, the wood board processing step 100 will be described. In the wood board processing step 100, the wood board is processed in advance before the drying process is performed by the hot plate press.
FIGS. 2 and 3 are both perspective views showing the wood board 10 after being processed in the wood board processing step 100.
The wood board 10 is a board material composed of six surfaces of a front side 1, a back side 2, end surfaces 3 and 4, and side surfaces 5 and 6. In the wood board processing step 100, the groove 7 is formed from the back side 2 of the wood board 10 toward the center in the thickness direction. The groove 7 is formed so as to communicate from the end surface 3 to the end surface 4, and communicates from the end surface 3 to the end surface 4 even when the surface of the back side 2 is closed.

なお、本実施形態では、溝７を３本形成したが、その数は特に限定されない。
また、本実施形態においては、端面３から端面４へと連通するように溝７を形成したが、溝７を、側面５から側面６へと連通するように形成してもよい。
なお、溝７を繊維に平行に形成すれば、強度面で有利であり、一方、溝７を繊維を切断する方向に形成すれば、強度は落ちるものの、乾燥しやすくなる。よって用途に合わせて溝７の方向を決めるとよい。
また、溝７を１つの端面（例えば端面３）のみに連通するように形成してもよい。このようにすれば、一方の端面（例えば端面４）に溝７が現れず、意匠性を向上させることができる。ただし、後に説明する熱圧乾燥工程２００において蒸気を効率的に放出するためには、２つの端面に連通するように形成しておくことが好ましい。 In the present embodiment, three grooves 7 are formed, but the number is not particularly limited.
In this embodiment, the groove 7 is formed so as to communicate from the end surface 3 to the end surface 4. However, the groove 7 may be formed so as to communicate from the side surface 5 to the side surface 6.
If the grooves 7 are formed in parallel to the fibers, it is advantageous in terms of strength. On the other hand, if the grooves 7 are formed in the direction in which the fibers are cut, the strength is lowered but it is easy to dry. Therefore, the direction of the groove 7 may be determined according to the application.
Moreover, you may form the groove | channel 7 so that it may connect only to one end surface (for example, end surface 3). If it does in this way, the groove | channel 7 will not appear in one end surface (for example, end surface 4), but the designability can be improved. However, in order to efficiently release the vapor in the hot-pressure drying process 200 described later, it is preferable to form it so as to communicate with the two end faces.

図４は、木質板加工工程１００で加工処理を行った後の木質板１０を示す正面図である。木質板１０に形成する溝部７の深さ、幅、密度等は、個々の最終用途と断面寸法により決定すべきものであるが、好ましい範囲は以下のとおりである。
すなわち、溝の深さＤは木質板の厚さＴの１／１０〜１／２倍、溝の幅Ｗは２ｍｍ〜木質板の厚さＴ、溝のピッチＰは木質板の厚さＴの１／２〜２倍とするとよい。 FIG. 4 is a front view showing the wood board 10 after processing in the wood board processing step 100. The depth, width, density, and the like of the groove portion 7 formed in the wood board 10 should be determined according to individual end use and cross-sectional dimensions, but preferable ranges are as follows.
That is, the depth D of the groove is 1/10 to 1/2 times the thickness T of the wooden board, the width W of the groove is 2 mm to the thickness T of the wooden board, and the pitch P of the groove is the thickness T of the wooden board. It is good to set it to 1/2 to 2 times.

次に、熱圧乾燥工程２００について説明する。
図５及び図６は、熱圧乾燥工程２００において木質板を熱板プレス内に挿入した状態を示す正面図であり、図５はプレス前を、図６はプレス中を示している。 Next, the hot pressure drying process 200 will be described.
5 and 6 are front views showing a state in which the wood board is inserted into the hot plate press in the hot-pressure drying step 200, FIG. 5 shows the state before pressing, and FIG. 6 shows the state during pressing.

熱圧乾燥工程２００では、図５に示すように、まず熱板プレス内に木質板１０を挿入する。このとき、木質板加工工程１００で溝部７を形成した木質板１０を２枚用意する。本実施形態では、木質板１０ａと木質板１０ｂの２枚の木質板を使用する。
そして、木質板１０ａの裏側２ａと木質板１０ｂの裏側２ｂを向かい合わせる。そうすると、木質板１０ａと木質板１０ｂを合わせた複合板が完成し、その厚さ方向中心に溝部７ａ，７ｂが配置される。さらに、木質板１０ａの表側１ａを上向きに、木質板１０ｂの表側１ｂを下向きにした状態で、熱板プレス内に挿入する。 In the hot-pressure drying process 200, as shown in FIG. 5, the wooden board 10 is first inserted in a hot plate press. At this time, two wooden boards 10 in which the grooves 7 are formed in the wooden board processing step 100 are prepared. In the present embodiment, two wooden boards, a wooden board 10a and a wooden board 10b, are used.
And the back side 2a of the wooden board 10a and the back side 2b of the wooden board 10b are faced each other. Then, a composite board in which the wooden board 10a and the wooden board 10b are combined is completed, and the grooves 7a and 7b are arranged at the center in the thickness direction. Further, it is inserted into the hot plate press with the front side 1a of the wooden board 10a facing upward and the front side 1b of the wooden board 10b facing downward.

実施形態１における熱板プレスは、上下２枚の熱板２０ａ，２０ｂを有しており、上側の熱板２０ａを降下させて、上下から木質板１０ａ，１０ｂを熱圧するようになっている。
また、熱板プレス内には、圧縮ひずみを制限するためのディスタンスバー３０ａ，３０ｂが挿入されている。ディスタンスバー３０ａ，３０ｂの高さを調整することで、所望の圧縮ひずみに達するまで木質板１０ａ，１０ｂの変形を進め、それ以上圧縮しないように制限することができる。 The hot plate press in the first embodiment has two upper and lower hot plates 20a and 20b, and the upper hot plate 20a is lowered to heat-press the wooden plates 10a and 10b from the upper and lower sides.
Further, distance bars 30a and 30b for limiting compressive strain are inserted in the hot plate press. By adjusting the heights of the distance bars 30a and 30b, the deformation of the wooden boards 10a and 10b can be advanced until the desired compression strain is reached, and it can be limited so as not to be compressed further.

木質板１０ａ，１０ｂを挿入した後、図６に示すように、上側の熱板２０ａを降下させて２枚の熱板２０ａ，２０ｂで挟み込んで、木質板１０ａ，１０ｂを熱圧して乾燥する。熱板２０ａ，２０ｂの温度は１００℃以上とする。
乾燥時間の経過と共に乾燥による木質板の収縮と、圧縮クリープによる変形が進み、熱板２０ａとディスタンスバー３０ａ，３０ｂの間隙は小さくなり、荷重が大きい場合は、最終的に間隙はなくなる。 After inserting the wooden boards 10a and 10b, as shown in FIG. 6, the upper hot plate 20a is lowered and sandwiched between the two hot plates 20a and 20b, and the wooden boards 10a and 10b are heated and dried. The temperature of the hot plates 20a and 20b is 100 ° C. or higher.
As the drying time elapses, the shrinkage of the wooden board due to drying and the deformation due to compression creep progress, the gap between the hot plate 20a and the distance bars 30a, 30b becomes smaller, and finally the gap disappears when the load is large.

木質板１０ａ，１０ｂに与える圧力は、２〜３０ｋｇｆ／ｃｍ2の範囲内の圧力とすることが好ましい。あるいは、木質板１０ａ，１０ｂに与える圧縮ひずみは、１０〜３０％の範囲内の圧縮ひずみとすることが好ましい。
上記範囲内の圧力あるいは圧縮ひずみを与えることにより、木質板１０ａ，１０ｂの乾燥割れを防止することができる。
すなわち、熱圧により木質板１０ａ，１０ｂの表面に垂直方向の圧縮応力が加わると、木質板内部では、水平方向に拡がるように、ポアソン比に相当する量の横圧縮応力が生じる。一方、熱圧による乾燥過程においては、木質板内部で水平方向の収縮による引張応力が生じる。上記範囲内の圧力あるいは圧縮ひずみのもとでは、これら２つの応力が相殺されるので、木質板１０ａ，１０ｂの乾燥割れを防止することができるのである。 The pressure applied to the wooden boards 10a and 10b is preferably set to a pressure in the range of 2 to 30 kgf / cm 2 . Alternatively, the compressive strain applied to the wooden boards 10a and 10b is preferably a compressive strain within a range of 10 to 30%.
By applying a pressure or compressive strain within the above range, dry cracking of the wooden boards 10a and 10b can be prevented.
That is, when compressive stress in the vertical direction is applied to the surfaces of the wooden boards 10a and 10b by hot pressure, lateral compressive stress corresponding to the Poisson's ratio is generated inside the wooden boards so as to spread in the horizontal direction. On the other hand, in the drying process by hot pressure, tensile stress due to horizontal contraction occurs inside the wooden board. Under the pressure or compressive strain within the above range, these two stresses cancel each other, so that dry cracking of the wooden boards 10a and 10b can be prevented.

ここで、溝部を設けることにより木質板内部に発生する蒸気を効率よく放出できる仕組みについて説明する。
一般に、木質板の表側に熱板を押し当てると，木質板の温度は表面で最も高く、内部、特に、中層部で最も低くなる。高温の部位で気化した水分は、より低温の部位に向かって流れるから、木質板の中層部では蒸気が集中することになる。
今、同じ厚さの２枚の木質板を重ね合わせ、上下に熱板を押し当てて加熱すると、２枚の木質板の境界面はこの複合板の中層であるから、蒸気の最も多く集中している層となる。この境界面に隙間（溝部）を設ければ、２枚の板に発生した蒸気はその隙間（溝部）から効率よく外部に排出できる。熱板温度が高ければ高いほど、蒸気の排出は激しくなる。 Here, a mechanism capable of efficiently releasing the steam generated inside the wooden board by providing the groove portion will be described.
In general, when a hot plate is pressed against the front side of a wooden board, the temperature of the wooden board is highest on the surface and lowest in the interior, particularly in the middle layer. The water vaporized in the hot part flows toward the cooler part, so that the steam concentrates in the middle layer of the wooden board.
Now, when two wooden boards of the same thickness are stacked and heated by pressing a hot plate up and down, the boundary between the two wooden boards is the middle layer of this composite board, so the most concentrated steam It becomes a layer. If a gap (groove) is provided on the boundary surface, the steam generated in the two plates can be efficiently discharged to the outside through the gap (groove). The higher the hot plate temperature, the more steam is exhausted.

なお、使用上、裏面の溝が問題になる製品については適用できないが、通常の板製品、例えば、床板、壁板、框材などでは、裏面の多少の溝は許容される。   In addition, although it cannot be applied to a product in which a groove on the back surface becomes a problem in use, some grooves on the back surface are allowed in a normal plate product, for example, a floor plate, a wall plate, and a roofing material.

次に、寸法安定化工程３００について説明する。
寸法安定化工程３００は、熱圧乾燥工程２００の後、さらに熱板２０ａ，２０ｂで熱圧を続けて木質板１０ａ，１０ｂの寸法安定性、耐腐朽性、耐虫害性等を向上させるものである。
このときの処理温度と処理時間は、樹種と使用目的により異なるが、熱圧乾燥工程２００の後、熱板２０ａ，２０ｂを１８０〜２３０℃の温度とし、少なくともさらに３時間熱圧を続けることが好ましい。
なお、熱圧乾燥工程２００及び寸法安定化工程３００は連続的に進行するものであり、初めは乾燥が進行し、途中から乾燥と寸法安定性向上がともに進み、その後寸法安定化処理のみが行われる。 Next, the dimension stabilization process 300 will be described.
The dimensional stabilization process 300 improves the dimensional stability, decay resistance, insect resistance and the like of the wooden boards 10a, 10b by continuing the hot pressing with the hot plates 20a, 20b after the hot pressure drying process 200. is there.
The treatment temperature and treatment time at this time vary depending on the tree species and purpose of use, but after the hot-pressure drying step 200, the hot plates 20a and 20b are brought to a temperature of 180 to 230 ° C. and the hot pressure is continued for at least another 3 hours. preferable.
The hot-pressure drying process 200 and the dimension stabilization process 300 proceed continuously. At first, the drying proceeds, and both the drying and the dimensional stability improvement progress from the middle, and then only the dimension stabilization process is performed. Is called.

次に、色調整工程４００について説明する。
色調整工程４００は、寸法安定化工程３００で木質板１０ａ，１０ｂの寸法安定性を向上させた後、寸法安定化後の木質板１０ａ，１０ｂに漂白液又は調色液を塗布し熱板で熱圧して、木質板１０ａ，１０ｂの色を調整するものである。 Next, the color adjustment process 400 will be described.
In the color adjustment process 400, after improving the dimensional stability of the wooden boards 10a and 10b in the dimensional stabilization process 300, a bleaching solution or a toning liquid is applied to the wooden boards 10a and 10b after the dimensional stabilization. The color of the wooden boards 10a and 10b is adjusted by hot pressing.

寸法安定化工程３００で高温の熱圧を続けた結果、処理後の木質板１０ａ，１０ｂの色調が暗褐色に変化する場合がある。
そこで、寸法安定化工程３００の後、室温程度まで温度が低下した木質板１０ａ，１０ｂの表面に、酸素系、塩素系などの漂白液を低濃度で塗布する。そして、熱圧乾燥工程２００と同様に、熱板プレス内に木質板１０ａ，１０ｂを挿入し、１００℃以下の熱板２０ａ，２０ｂにより表面に熱を与え、薬液の拡散を促して木質板１０ａ，１０ｂ内部全体を均一に漂白する。なお、このとき与える熱は寸法安定化工程３００時よりも低温でよいので、寸法安定化工程３００後の熱板の余熱を利用することが可能であり、あらためて熱板を加熱しないで処理することもできる。
同様に、調色液を塗布して熱圧し、使用上好ましい色に染色してもよい。 As a result of continuing the high temperature hot pressure in the dimension stabilization process 300, the color tone of the treated wood boards 10a and 10b may change to dark brown.
Therefore, after the dimension stabilization process 300, a bleaching solution such as an oxygen-based material or a chlorine-based material is applied at a low concentration on the surfaces of the wooden boards 10a, 10b whose temperature has been lowered to about room temperature. Then, similarly to the hot-pressure drying step 200, the wood plates 10a and 10b are inserted into the hot plate press, the surface is heated by the heat plates 20a and 20b of 100 ° C. or less, and the diffusion of the chemical solution is promoted to promote the wood plate 10a. , 10b uniformly bleaches the entire interior. In addition, since the heat given at this time may be lower than at the time of the dimension stabilization process 300, it is possible to use the remaining heat of the hot plate after the dimension stabilization process 300, and the heat plate is processed again without heating. You can also.
Similarly, a color-adjusting solution may be applied and hot-pressed, and dyed into a color preferable for use.

なお、本実施形態においては、寸法安定化工程３００の後に色調整工程４００を設けたが、寸法安定化工程３００を設けない場合であっても、熱圧乾燥工程２００での処理により木質板が変色することもあるため、熱圧乾燥工程２００の後に色調整工程４００を設けて色を調整するようにしてもよい。
また、寸法安定化工程３００と色調整工程４００は、必ずしも設ける必要はない。 In the present embodiment, the color adjustment process 400 is provided after the dimension stabilization process 300. However, even if the dimension stabilization process 300 is not provided, the wood board is removed by the process in the hot-pressure drying process 200. Since the color may change, the color may be adjusted by providing a color adjustment step 400 after the hot-pressure drying step 200.
In addition, the dimension stabilization process 300 and the color adjustment process 400 are not necessarily provided.

実施形態１に係る木質板の乾燥処理方法によれば、木質板加工工程１００で、木質板１０の裏側２から厚さ方向中心に向けて、端面３，４へと連通するように溝部７を形成するので、この溝部７を熱圧乾燥時に発生する蒸気の逃げ道とすることができる。   According to the wood board drying method according to the first embodiment, in the wood board processing step 100, the grooves 7 are formed so as to communicate with the end faces 3 and 4 from the back side 2 of the wood board 10 toward the center in the thickness direction. Since it forms, this groove part 7 can be made into the escape route of the vapor | steam generated at the time of hot-pressure drying.

また、熱圧乾燥工程２００で、まず溝部７を形成した２枚の木質板１０ａ，１０ｂの裏側２ａ，２ｂ同士を向かい合わせるので、２枚の木質板１０ａ，１０ｂを合わせた複合板の厚さ方向中心に、蒸気の逃げ道である溝部７ａ，７ｂを配置することができる。そして、一方の木質板１０ａの表側１ａを上向きに、他方の木質板１０ｂの表側１ｂを下向きにした状態で、上下２枚の熱板２０ａ，２０ｂを有する熱板プレスの間に挿入するので、蒸気の逃げ道である溝部７ａ，７ｂを上下２枚の熱板２０ａ，２０ｂから最も遠い位置に配置することができる。   In addition, since the back sides 2a and 2b of the two wooden boards 10a and 10b in which the groove portions 7 are formed are first opposed to each other in the hot-pressure drying process 200, the thickness of the composite board in which the two wooden boards 10a and 10b are combined. Groove portions 7a and 7b, which are escape routes for steam, can be arranged at the center of the direction. And, with the front side 1a of one wooden board 10a facing upward and the front side 1b of the other wooden board 10b facing downward, it is inserted between hot plate presses having two upper and lower hot plates 20a, 20b, The groove portions 7a and 7b, which are escape routes for steam, can be arranged at the farthest positions from the two upper and lower hot plates 20a and 20b.

この状態で熱板プレスにより熱圧して乾燥するので、木質板内部に発生する蒸気は、熱板２０ａ，２０ｂと接する木質板１０ａ，１０ｂの表側１ａ，１ｂから、熱板２０ａ，２０ｂから最も遠い裏側２ａ，２ｂの溝部７ａ，７ｂに向けて移動し、連通した端面３，４から放出される。従って、木質板１０ａ，１０ｂの厚さや熱板の温度が制限されることなく、蒸気を適切に放出することができ、乾燥時間を短縮することができる。   In this state, it is dried by hot pressing with a hot plate press, so the steam generated inside the wooden plate is farthest from the hot plates 20a, 20b from the front sides 1a, 1b of the wooden plates 10a, 10b contacting the hot plates 20a, 20b. It moves toward the groove portions 7a and 7b on the back sides 2a and 2b, and is discharged from the communicating end surfaces 3 and 4. Therefore, the steam can be properly discharged without limiting the thickness of the wooden boards 10a and 10b and the temperature of the hot plate, and the drying time can be shortened.

また、木質板加工工程１００において、溝部７を一方の端面３から他方の端面４へと連通するように形成するので、蒸気の放出を両側の端面３，４から行うことができ、よりスムーズに蒸気を放出することができる。   Further, in the wood board processing step 100, the groove portion 7 is formed so as to communicate from one end face 3 to the other end face 4, so that steam can be discharged from the end faces 3 and 4 on both sides, and more smoothly. Vapor can be released.

また、熱圧乾燥工程２００において、木質板１０ａ，１０ｂに２〜３０ｋｇｆ／ｃｍ2の範囲内の圧力を与えながら熱圧して乾燥させることで、木質板１０ａ，１０ｂの乾燥割れを防止することができる。
同様に、熱圧乾燥工程２００において、木質板１０ａ，１０ｂに１０〜３０％の範囲内の圧縮ひずみを与えながら熱圧して乾燥させることで、木質板１０ａ，１０ｂの乾燥割れを防止することができる。 Moreover, in the hot-pressure drying process 200, drying cracking of the wooden boards 10a and 10b can be prevented by applying hot pressure to the wooden boards 10a and 10b while applying a pressure within a range of 2 to 30 kgf / cm 2. it can.
Similarly, in the hot-pressure drying process 200, drying cracking of the wooden boards 10a and 10b can be prevented by applying hot compression while drying the wooden boards 10a and 10b in a range of 10 to 30%. it can.

また、熱圧乾燥工程２００において、熱板プレスの間に圧縮ひずみを制限するディスタンスバー３０ａ，３０ｂを挿入するので、所望の圧縮ひずみに達するまで木質板１０ａ，１０ｂの変形を進めることができる。   Further, in the hot-pressure drying process 200, the distance bars 30a and 30b for limiting the compressive strain are inserted between the hot plate presses, so that the deformation of the wooden boards 10a and 10b can be advanced until the desired compressive strain is reached.

また、熱圧乾燥工程２００の後、さらに熱板２０ａ，２０ｂで熱圧を続けて木質板１０ａ，１０ｂの寸法安定性を向上させる寸法安定化工程３００を設けたので、木質板１０ａ，１０ｂの材質改良を連続的に行い、使用時に吸湿による寸法変化率等を改善することができる。   In addition, after the hot-pressure drying step 200, a dimensional stabilization step 300 for further improving the dimensional stability of the wooden boards 10a, 10b by continuing the hot pressing with the hot plates 20a, 20b is provided. The material can be continuously improved, and the dimensional change rate due to moisture absorption can be improved during use.

また、寸法安定化工程３００の後、寸法安定化後の木質板１０ａ，１０ｂに漂白液又は調色液を塗布し熱板２０ａ，２０ｂで熱圧して木質板１０ａ，１０ｂの色を調整する色調整工程４００を設けたので、熱圧乾燥工程２００と寸法安定化工程３００で木質板１０ａ，１０ｂの色調が暗褐色等に変化した場合に、漂白や調色を行って使用目的に合致した色に調整することができる。   Further, after the dimension stabilization process 300, a color for adjusting the color of the wooden boards 10a and 10b by applying a bleaching solution or a color-adjusting liquid to the wooden boards 10a and 10b after the dimension stabilization and hot-pressing with the hot boards 20a and 20b. Since the adjustment process 400 is provided, when the color tone of the wooden boards 10a and 10b is changed to dark brown or the like in the hot pressure drying process 200 and the dimension stabilization process 300, a color that matches the purpose of use by performing bleaching or color matching Can be adjusted.

なお、実施形態１においては、木質板１０ａと木質板１０ｂの溝部７の形成位置を同一とし、熱板プレス内で向かい合わせたときに、それぞれの溝部７ａと溝部７ｂの位置が対応するようにしたが、２つの木質板の溝部７の形成位置は同一である必要はない。   In the first embodiment, the formation positions of the groove portions 7 of the wood board 10a and the wood board 10b are the same, and when facing each other in the hot plate press, the positions of the groove portions 7a and the groove portions 7b correspond to each other. However, the formation position of the groove part 7 of two wood boards does not need to be the same.

以下、本発明の実施形態１に係る木質板の乾燥処理方法により、木質板を乾燥させた実験結果を示す。   Hereinafter, an experimental result of drying a wood board by the wood board drying method according to Embodiment 1 of the present invention will be described.

木質板の樹種はラジアータパインで板目材または柾目材を用いた。板の寸法は、幅１０５ｍｍ×長さ３００ｍｍ×厚さ３６ｍｍであり、裏側の溝部の加工は、切込み数３本、切込み幅３ｍｍ、切込み深さ１２ｍｍ、切込み間隔は両端からそれぞれ１６ｍｍ、中央部は３２ｍｍ間隔とした。   The wood plank species were Radiata pine, and wood or wood was used. The dimensions of the plate are 105mm width x 300mm length x 36mm thickness. The processing of the groove on the back side is 3 cuts, 3mm cut width, 12mm cut depth, the cut interval is 16mm from both ends, the center is The interval was 32 mm.

このように加工した２枚の木質板について、それぞれの裏側（溝加工された面）同士を向かい合わせに重ねて、表側から熱板で挟み込んだ。この際、圧縮ひずみを制限するために、プレス両側に厚さ６２ｍｍのディスタンスバーを挿入した。プレス圧力は３ｋｇｆ／ｃｍ2一定に設定した。 About the two wood boards processed in this way, each back side (grooved surface) was piled up facing each other, and it pinched | interposed with the hot plate from the front side. At this time, in order to limit the compressive strain, a distance bar having a thickness of 62 mm was inserted on both sides of the press. The press pressure was set constant at 3 kgf / cm 2 .

熱板温度は２１５℃に設定した。木質板の温度は１００℃付近までは急速に上昇した後、一旦停滞するが、水分の減少とともに徐々に上昇し、最終的に熱板プレスの設定温度２１５℃に到達した。この状態で３〜４時間保持した後、プレスを解圧して木質板を取り出した。   The hot plate temperature was set at 215 ° C. The temperature of the wooden board rapidly increased to around 100 ° C. and then stagnated, but gradually increased with a decrease in moisture, and finally reached a set temperature of 215 ° C. of the hot plate press. After holding in this state for 3 to 4 hours, the pressure was released and the wood board was taken out.

取り出した木質板は、いずれも干割れが無かったが、暗褐色に変色していた。そこで室温に冷却後、板表面に過酸化水素水と次亜塩素酸ナトリウムを混合した濃度１０％の漂白液を塗布した後、再び６０℃の熱板プレスに挿入して、圧力３ｋｇｆ／ｃｍ2の一定荷重をかけた。その状態で１分間保持した後、プレスを解圧して木質板を取り出した。 None of the wood boards taken out had any dry cracks, but had turned dark brown. Therefore, after cooling to room temperature, a bleaching solution having a concentration of 10% mixed with hydrogen peroxide and sodium hypochlorite was applied to the surface of the plate, and then inserted again into a hot plate press at 60 ° C., and a pressure of 3 kgf / cm 2. A constant load of was applied. After holding in that state for 1 minute, the pressure was released from the press and the wood board was taken out.

以上の処理を行ったもののうち、一部の板について、表面にパテントブルーを４％添加した水溶液を塗布した後、再び６０℃の熱板プレスに挿入して、プレス圧力３ｋｇｆ／ｃｍ2の圧力をかけた。その状態で１分間保持した後、プレスを解圧して木質板を取り出した。 Among the plates subjected to the above treatment, after applying an aqueous solution containing 4% of patent blue on the surface of some of the plates, the plates were inserted again into a hot plate press at 60 ° C., and a pressure of 3 kgf / cm 2 was applied. I applied. After holding in that state for 1 minute, the pressure was released from the press and the wood board was taken out.

以上の処理を行って得られた乾燥材の材質を調べた結果は表１の通りである。   Table 1 shows the results of examining the material of the desiccant obtained by the above treatment.

Figure 0004917367
Figure 0004917367

表1より、曲げ強度及び曲げヤング率は高温熱処理乾燥によりほとんど変化せず、吸湿による寸法変化率は長さで２０％、幅で３４％、厚さで７１％改善されていることがわかる。   From Table 1, it can be seen that the bending strength and bending Young's modulus are hardly changed by high-temperature heat treatment drying, and the dimensional change rate due to moisture absorption is improved by 20% in length, 34% in width, and 71% in thickness.

次に、図７を参照して、本発明の実施形態２に係る木質板の乾燥処理方法について説明する。
実施形態２に係る木質板の乾燥処理方法は、実施形態１に係る木質板の乾燥処理方法と同様に、図１に示す木質板加工工程１００、熱圧乾燥工程２００、寸法安定化工程３００、及び色調整工程４００から構成されているが、木質板加工工程１００と熱圧乾燥工程２００の内容が異なっている。 Next, a wood board drying method according to Embodiment 2 of the present invention will be described with reference to FIG.
The wood board drying method according to the second embodiment is similar to the wood board drying method according to the first embodiment. The wood board processing step 100, the hot-pressure drying step 200, the dimension stabilization step 300 shown in FIG. And the color adjustment process 400, the contents of the wood board processing process 100 and the hot-pressure drying process 200 are different.

図７は、実施形態２に係る熱圧乾燥工程２００において木質板を熱板プレス内に挿入した状態を示す正面図である。
本実施形態においては、木質板加工工程１００で、木質板１０の端面３，４へと連通するように空間部８を形成する。なお空間部８は、一方の端面のみに連通していてもよい。また、空間部８は、木質板１０の表側及び裏側のいずれにも連通しておらず、内部をボーリング加工によりくり抜いて形成されている。
そして空間部８を形成した木質板１０を熱板プレスに挿入する。 FIG. 7: is a front view which shows the state which inserted the wooden board in the hot plate press in the hot-pressure drying process 200 which concerns on Embodiment 2. FIG.
In the present embodiment, in the wood board processing step 100, the space portion 8 is formed so as to communicate with the end faces 3 and 4 of the wood board 10. In addition, the space part 8 may be connected only to one end surface. The space 8 does not communicate with either the front side or the back side of the wood board 10 and is formed by hollowing out the inside by boring.
And the wooden board 10 which formed the space part 8 is inserted in a hot plate press.

次に、熱圧乾燥工程２００で、熱板２０ａを降下させて熱圧すると、木質板１０は表裏両面から加熱され、内部に発生した蒸気は、空間部８から端面３，４に向けて放出される。   Next, in the hot-pressure drying process 200, when the hot plate 20a is lowered and hot pressed, the wood board 10 is heated from both the front and back surfaces, and the steam generated inside is released from the space 8 toward the end faces 3 and 4. Is done.

実施形態２に係る木質板の乾燥処理方法によれば、木質板加工工程１００で、木質板１０に、端面３，４へと連通するように空間部８を形成するので、この空間部８を熱圧乾燥時に発生する蒸気の逃げ道とすることができる。そして、熱圧乾燥工程２００で熱板プレスにより木質板１０を熱圧して乾燥することができる。   According to the wood board drying method according to the second embodiment, in the wood board processing step 100, the space portion 8 is formed on the wood board 10 so as to communicate with the end faces 3, 4. It can be a escape route for steam generated during hot-pressure drying. In the hot-pressure drying process 200, the wood board 10 can be hot-pressed and dried by a hot-plate press.

なお、空間部８を木質板１０の表裏面の一方（例えば裏側２）に連通又は近接させて形成するとともに、熱板を片側のみ有する熱板プレスで、木質板１０の表裏面の他方（例えば表側１）から熱圧するようにしてもよい。そうすれば、蒸気の逃げ道である空間部８を熱板プレスの熱板から遠い位置に配置することができる。そして、この状態で熱板プレスにより熱圧して乾燥すれば、木質板１０内部に発生する蒸気は、熱板から遠い空間部８に向けて移動し、連通した端面３，４から放出される。従って、木質板１０の厚さや熱板の温度が制限されることなく、蒸気を適切に放出することができ、乾燥時間を短縮することができる。   The space 8 is formed in communication with or close to one of the front and back surfaces of the wooden board 10 (for example, the back side 2), and the other of the front and back surfaces of the wooden board 10 (for example, the hot plate press having only one side) You may make it heat-press from the front side 1). If it does so, the space part 8 which is an escape route of a vapor | steam can be arrange | positioned in the position far from the hot platen of a hot plate press. And if it heat-presses with a hot plate press and it dries in this state, the vapor | steam generated inside the wooden board 10 will move toward the space part 8 far from a hot plate, and will be discharge | released from the end surfaces 3 and 4 which connected. Therefore, the steam can be discharged appropriately without limiting the thickness of the wooden board 10 and the temperature of the hot plate, and the drying time can be shortened.

次に、図８を参照して、本発明の実施形態３に係る木質板の乾燥処理方法について説明する。
実施形態３に係る木質板の乾燥処理方法は、実施形態１に係る木質板の乾燥処理方法と同様に、図１に示す木質板加工工程１００、熱圧乾燥工程２００、寸法安定化工程３００、及び色調整工程４００から構成されているが、熱圧乾燥工程２００の内容が異なっている。 Next, a wood board drying method according to Embodiment 3 of the present invention will be described with reference to FIG.
The wood board drying method according to the third embodiment is the same as the wood board drying method according to the first embodiment, as shown in FIG. 1 is the wood board processing step 100, the hot-pressure drying step 200, the dimension stabilization step 300, And the color adjustment process 400, the contents of the hot-pressure drying process 200 are different.

図８は、実施形態３に係る熱圧乾燥工程２００において木質板を熱板プレス内に挿入した状態を示す正面図である。
本実施形態においては、木質板加工工程１００で溝部７ａを形成した木質板１０ａを１枚のみ用いる。そして、木質板１０ａの表側１ａを上向きに、裏側２ａを下向きにした状態で熱板プレスに挿入する。 FIG. 8 is a front view showing a state in which a wood board is inserted into a hot plate press in the hot-pressure drying process 200 according to the third embodiment.
In the present embodiment, only one wood board 10a in which the groove 7a is formed in the wood board processing step 100 is used. And it inserts in a hot plate press in the state which turned the front side 1a of the wooden board 10a upward, and made the back side 2a downward.

本実施形態の熱板プレスは、上側に熱板２０ａを有しているが、下側には熱板ではなく単なる支持板４０が配置されている。
従って、熱圧乾燥工程２００で、熱板２０ａを降下させて熱圧すると、木質板１０ａは表側１ａから加熱され、内部に発生した蒸気は、溝部７ａから端面３，４に向けて放出される。 The hot plate press of this embodiment has a hot plate 20a on the upper side, but a simple support plate 40 is arranged on the lower side instead of the hot plate.
Accordingly, when the hot plate 20a is lowered and hot pressed in the hot pressure drying step 200, the wood board 10a is heated from the front side 1a, and the steam generated inside is released from the groove portion 7a toward the end faces 3 and 4. .

実施形態３に係る木質板の乾燥処理方法によれば、熱圧乾燥工程２００で、溝部７ａを形成した木質板１０ａの表側１ａを上向きに、裏側２ａを下向きにした状態で、上側に熱板２０ａを有する熱板プレスの間に挿入するので、蒸気の逃げ道である溝部７ａを上側の熱板２０ａから最も遠い位置に配置することができる。
この状態で熱板プレスにより熱圧して乾燥するので、木質板１０ａ内部に発生する蒸気は、熱板２０ａと接する木質板１０ａの表側１ａから、熱板２０ａから最も遠い裏側２ａの溝部７ａに向けて移動し、連通した端面３，４から放出される。従って、木質板１０ａの厚さや熱板２０ａの温度が制限されることなく、蒸気を適切に放出することができ、乾燥時間を短縮することができる。 According to the method for drying a wooden board according to the third embodiment, in the hot-pressure drying step 200, the wooden board 10a in which the groove portion 7a is formed has the front side 1a facing upward and the back side 2a facing downward, with the hot board facing upward. Since it is inserted between the hot plate presses having 20a, the groove portion 7a, which is the escape route for steam, can be arranged at a position farthest from the upper hot plate 20a.
In this state, it is dried by hot pressing with a hot plate press, so that steam generated inside the wooden plate 10a is directed from the front side 1a of the wooden plate 10a in contact with the hot plate 20a to the groove portion 7a on the back side 2a farthest from the hot plate 20a. And are discharged from the end faces 3 and 4 that communicate with each other. Therefore, the steam can be appropriately discharged without limiting the thickness of the wooden board 10a and the temperature of the hot plate 20a, and the drying time can be shortened.

本発明の実施形態に係る木質板の乾燥処理方法を示す工程図である。It is process drawing which shows the drying processing method of the wooden board which concerns on embodiment of this invention. 木質板加工工程で加工処理を行った後の木質板を示す斜視図である。It is a perspective view which shows the wooden board after processing in a wooden board processing process. 木質板加工工程で加工処理を行った後の木質板を示す斜視図である。It is a perspective view which shows the wooden board after processing in a wooden board processing process. 木質板加工工程で加工処理を行った後の木質板を示す正面図である。It is a front view which shows the wooden board after processing in a wooden board processing process. 実施形態１に係る熱圧乾燥工程において木質板を熱板プレス内に挿入した状態（プレス前）を示す正面図である。It is a front view which shows the state (before press) which inserted the wooden board in the hot plate press in the hot-pressure drying process which concerns on Embodiment 1. FIG. 実施形態１に係る熱圧乾燥工程において木質板を熱板プレス内に挿入した状態（プレス中）を示す正面図である。It is a front view which shows the state (during press) in which the wooden board was inserted in the hot plate press in the hot-pressure drying process which concerns on Embodiment 1. FIG. 実施形態２に係る熱圧乾燥工程において木質板を熱板プレス内に挿入した状態（プレス中）を示す正面図である。It is a front view which shows the state (during press) in which the wooden board was inserted in the hot plate press in the hot-pressure drying process which concerns on Embodiment 2. FIG. 実施形態３に係る熱圧乾燥工程において木質板を熱板プレス内に挿入した状態（プレス中）を示す正面図である。It is a front view which shows the state (during press) in which the wooden board was inserted in the hot plate press in the hot-pressure drying process which concerns on Embodiment 3. FIG. 従来例に係る木質板の乾燥処理方法を示す正面図である。It is a front view which shows the drying processing method of the wooden board which concerns on a prior art example.

符号の説明Explanation of symbols

１ 表側
２ 裏側
３ 端面
４ 端面
５ 側面
６ 側面
７ 溝部
８ 空間部
１０ 木質板
２０ 熱板
３０ ディスタンスバー
４０ 支持板
５０ 単板
６０ 熱板
７０ 蒸気逃し用部材
１００ 木質板加工工程
２００ 熱圧乾燥工程
３００ 寸法安定化工程
４００ 色調整工程 DESCRIPTION OF SYMBOLS 1 Front side 2 Back side 3 End face 4 End face 5 Side face 6 Side face 7 Groove part 8 Space part 10 Wood board 20 Hot plate 30 Distance bar 40 Support board 50 Single board 60 Hot board 70 Steam escape member 100 Wood board processing process 200 Thermal pressure drying process 300 Dimension stabilization process 400 Color adjustment process

Claims (6)

木質板に、その少なくとも１つの端面へと連通するように空間部を形成する木質板加工工程と、
前記木質板を熱板プレスの間に挿入し、前記熱板プレスにより前記木質板を熱圧して乾燥する熱圧乾燥工程とを有し、前記熱圧によって前記木質板の内部に発生した蒸気を前記空間部から前記木質板の端面に向けて放出させるように、前記空間部を熱圧乾燥時に発生する蒸気の逃げ道としたことを特徴とする木質板の乾燥処理方法。 A wood board processing step of forming a space portion in the wood board so as to communicate with the at least one end face;
Said wood board is inserted between the hot plate press, the wood board possess a hot pressing step of drying heat-pressed by the hot plate press, a vapor generated inside the wood board by the heat pressure A method for drying a wooden board, characterized in that the space part is used as an escape path for steam generated during hot-pressure drying so that the space part is discharged toward the end face of the wooden board. 木質板に、その少なくとも１つの端面へと連通するとともに前記木質板の表裏面の一方に連通又は近接させるようにして空間部を形成する木質板加工工程と、
前記木質板を熱板プレスの間に挿入し、前記熱板プレスで前記木質板の表裏面の他方から熱圧して乾燥する熱圧乾燥工程とを有し、前記熱圧によって前記木質板の内部に発生した蒸気を前記空間部から前記木質板の端面に向けて放出させるように、前記空間部を熱圧乾燥時に発生する蒸気の逃げ道としたことを特徴とする木質板の乾燥処理方法。 A wooden board processing step of forming a space portion in such a manner as to communicate with or close to one of the front and back surfaces of the wooden board and communicate with at least one end face of the wooden board;
A hot press drying step of inserting the wood board between hot plate presses and drying by hot pressing from the other of the front and back surfaces of the wood board with the hot plate press, and the inside of the wood board by the hot pressure A method for drying a wood board , wherein the space portion is used as an escape path for steam generated during hot-pressure drying so that the steam generated in the step is discharged from the space portion toward an end surface of the wood board. 木質板の裏側から厚さ方向中心に向けて、かつ少なくとも１つの端面へと連通するように溝部を形成する木質板加工工程と、
前記溝部を形成した木質板を２枚用意し、前記２枚の木質板の裏側同士を向かい合わせるとともに、一方の木質板の表側を上向きに、他方の木質板の表側を下向きにした状態で、上下２枚の熱板を有する熱板プレスの間に挿入し、前記熱板プレスにより前記２枚の木質板を熱圧して乾燥する熱圧乾燥工程とを有することを特徴とする木質板の乾燥処理方法。 A wooden board processing step of forming a groove so as to communicate from the back side of the wooden board toward the center in the thickness direction and to at least one end face;
While preparing two wooden boards formed with the groove, the two wooden boards face each other back, the front side of one wooden board facing up, the front side of the other wooden board facing down, Drying of a wooden board, comprising: a hot press drying process which is inserted between hot plate presses having two upper and lower hot plates, and the hot press presses the two wooden boards to dry them. Processing method. 前記熱圧乾燥工程において、前記木質板に１０〜３０％の範囲内の圧縮ひずみを与えながら熱圧して乾燥させることを特徴とする請求項１乃至請求項３のうちいずれか一つに記載の木質板の乾燥処理方法。   The said hot-pressure drying process WHEREIN: It heat-presses and drys, giving the compressive strain within the range of 10-30% to the said wooden board, It is any one of Claim 1 thru | or 3 characterized by the above-mentioned. A method for drying wood board. 前記熱圧乾燥工程の後、さらに熱板で熱圧を続けて前記木質板の寸法安定性を向上させる寸法安定化工程を設けたことを特徴とする請求項１乃至請求項４のうちいずれか一つに記載の木質板の乾燥処理方法。   5. The dimensional stabilization step of further improving the dimensional stability of the wooden board by continuing the hot pressing with a hot plate after the hot pressure drying step is provided. The drying method of the wooden board as described in one. 前記寸法安定化工程で前記木質板の寸法安定性を向上させた後、寸法安定化後の木質板に漂白液又は調色液を塗布し熱板の余熱で熱圧して前記木質板の色を調整する色調整工程を設けたことを特徴とする請求項５に記載の木質板の乾燥処理方法。   After improving the dimensional stability of the wooden board in the dimensional stabilization step, a bleaching solution or a color mixing solution is applied to the wooden board after the dimension stabilization, and the color of the wooden board is changed by hot pressing with the residual heat of the hot plate. 6. The method for drying a wood board according to claim 5, further comprising a color adjustment step for adjustment.
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