JPH0622802B2 - Method for drying wood and method for simultaneously processing coloring and degreasing during drying - Google Patents

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、木材乾燥と、その乾燥時における加色及び脱
脂の同時加工方法に関する。Description: FIELD OF THE INVENTION The present invention relates to a method for simultaneously processing wood drying and coloring and degreasing during the drying.

従来技術と問題点 木材の人工乾燥には、通常、蒸気乾燥方式，低温除湿乾
燥方式などがある。Conventional technology and problems Artificial drying of wood usually includes steam drying and low temperature dehumidifying and drying.

木材の生材を水分含有率10％位まで乾燥する場合、前者
方式で10日、後者方式で２週間以上の日数を必要として
いる。また、後者方式の場合、木材にカビが繁殖しやす
い環境となるため、針葉樹の乾燥には適さない。When the raw wood material is dried to a water content of about 10%, the former method requires 10 days and the latter method requires more than 2 weeks. Also, the latter method is not suitable for drying conifers because it creates an environment in which mold easily grows on wood.

木材の加色は、高温高圧装置による場合、不活性ガス作
用による埋木状に加工する手段が提案されており、一般
加色手段としても有効であるが、上記高温高圧装置とし
て真空高圧タンクが必要であり、そのために装置の複雑
化を招いて故障多発の心配があり、また、前処理（乾
燥）した木材を真空高圧タンクに入れる必要があり、そ
のため前処理時間と真空高圧タンク処理時間とを合わせ
て７日位の処理時間が必要となっており、さらに前記装
置の複雑化によるコスト高が難点になっている。When wood is colored by a high-temperature and high-pressure device, a means for processing it into a burial tree by the action of an inert gas has been proposed, and it is also effective as a general coloring means, but a vacuum high-pressure tank is required as the high-temperature and high-pressure device. As a result, the equipment becomes complicated and there is a risk of frequent failures, and it is necessary to put the pretreated (dry) wood in the vacuum high-pressure tank. Therefore, the pretreatment time and the vacuum high-pressure tank treatment time are In total, a processing time of about 7 days is required, and further the cost is increased due to the complexity of the device.

針葉樹の脱脂では、特にから松について、一般に長野方
式といわれるアルカリ抽出法があるが、ヤニ成分中、揮
発性のテルペンが揮発するのみならず、不揮発性のロジ
ンが抽出されてしまって、木材の強度を低下せしめると
いう不利があり、かつ脱脂と乾燥との処理工程が分か
れ、高い加工コストが難点となって一般に普及していな
い。このため、一般には、通常の蒸気乾燥で乾燥処理と
同時に行なわれているが、生材からだと、やはり10日前
後の処理日数を必要とし、処理後にヤニの吹出しを見せ
るものがあり、完全処理になっていない。ことに、この
程度の処理では工芸材として不十分である。In the degreasing of conifers, especially for pine, there is an alkali extraction method generally called the Nagano method. It has the disadvantage of lowering the strength, and the processing steps of degreasing and drying are separated, and the high processing cost is a difficulty, and it is not widely used. For this reason, in general, normal steam drying is performed at the same time as the drying process, but from raw wood, it also takes about 10 days to process it, and there are some that show the blowout of the tar after the process, so it is a complete process. It's not. In particular, this level of processing is not enough as a craft material.

北海道、とくに十勝地方を中心に道東域に豊富なから松
は、生育が早い、我国の針葉樹中最も強度が高いなどの
すぐれた特質を有している。しかし、一方でから松は、
とくに間伐材において、捻れ等の狂いが生じやすい，節
目が多い、さらに、ヤニ分が多い，激しい赤褐色の自然
酸化変色，この自然酸化変色時における白太，赤太の色
差などが欠点とされている。このため、低質材として、
梱包材，パレット材，チップ材などといった用途に利用
されているにすぎない。Abundant in Hokkaido, especially in the Tokachi region, in the eastern part of Hokkaido, pine has excellent characteristics such as fast growing and the highest strength among the conifers in Japan. But on the other hand, the pine
In particular, thinned wood is prone to distortion such as twisting, has many knots, has a large amount of tar, has a strong reddish-brown natural oxidative discoloration, and has a defect such as the color difference between white and red thick during this natural oxidative discoloration. There is. Therefore, as a low quality material,
It is only used for packaging materials, pallets, chips, etc.

本発明は、叙上の事情に鑑みてなしたもので、木材の人
工乾燥における処理期間を顕著に短縮すると共に、針葉
樹、ことにから松の完全脱脂，自然色である赤味の解
消，変色防止，白太，赤太の色差を解消するための加色
などを目的とする。本発明は、上記の脱脂，赤味解消，
変色防止，加色などを乾燥工程と同時に処理すると共
に、捻れなどの狂い発生を防止せしめ、被加工木材に建
材，工芸材としての需要分野を開くことをもう一つの目
的とする。The present invention has been made in view of the above circumstances, and significantly shortens the treatment period in artificial drying of wood, complete degreasing of coniferous trees, especially pine, elimination of natural redness, discoloration. The purpose is prevention, and color addition to eliminate the color difference between white and red. The present invention provides the above degreasing, redness elimination,
Another purpose is to prevent discoloration and coloring at the same time as the drying process, and to prevent distortion such as twisting, and to open demand fields for processed wood as building materials and craft materials.

問題点を解消するための手段 上記発明の目的を達成するために本発明がなした手段
は、請求項（１）では木材を常温、常圧から150 ℃〜18
0 ℃位に加熱しながら、５気圧〜10気圧位に加圧して高
温高圧蒸気処理するということ、請求項（２）では該高
温高圧蒸気処理した後で風力乾燥するということ、請求
項（３）では請求項（１）の高温高圧蒸気処理すること
により、木材の周辺部又は周辺部から中心部までを褐色
に加色するということ、請求項（４）では請求項（１）
の高温高圧蒸気処理することにより、針葉樹からなる木
材の揮発成分を揮発せしめると共に、不揮発成分を固化
せしめるということなどである。Means for Solving the Problems In order to achieve the above-mentioned object of the present invention, the means according to the present invention is as follows.
While heating at about 0 ° C., pressurizing to about 5 to 10 atm for high-temperature high-pressure steam treatment, and in claim (2), performing high-temperature high-pressure steam treatment, followed by wind drying. In (), the high temperature and high pressure steam treatment of Claim (1) is used to add brown color to the peripheral part of the wood or from the peripheral part to the central part, and in claim (4) the claim (1).
The high-temperature and high-pressure steam treatment makes it possible to volatilize volatile components of coniferous wood and to solidify non-volatile components.

実施例 本発明の乾燥，加色，脱脂の対象となりえる代表的な樹
種を挙げれば、針葉樹では、から松，えぞ松、とど松な
などがあり、広葉樹では、なら，かば，たもなどがある
が、これらに制約されるものではない。また、乾燥装置
としては、既存の高温高圧蒸気乾燥装置を使用すること
が可能である。たとえば、コンクリート２次製品の乾燥
養生に使用されている高温高圧蒸気乾燥装置（直径３ｍ
位、長さ32ｍ位の円筒形タンクとボイラーとからなり、
温度及び圧力の最高能力は 191℃位、12気圧位）を使用
することが可能であるが、この乾燥装置に制約されるも
のではなく、この乾燥装置と同程度の規模と能力とを有
する木材乾燥装置ならば、使用可能である。風力乾燥装
置は、蒸気の高温高圧蒸気乾燥装置に熱風乾燥設備又は
冷風乾燥設備を付加して使用すること、或は既存の風力
木材乾燥装置もしくは熱風乾燥機能と蒸気乾燥機能とを
兼備した既存の木材乾燥装置を使用することなどが可能
である。Examples Representative tree species that can be subjected to drying, coloring, and degreasing according to the present invention include coniferous trees such as Karamatsu, Ezomatsu, and Todomatsuna, and broad-leaved trees include Nara, Kaba, and Kata. There are things such as Momo, but they are not limited to these. Further, as the drying device, it is possible to use an existing high temperature and high pressure steam drying device. For example, a high-temperature and high-pressure steam dryer (3m diameter) used for drying and curing secondary concrete products.
Consisting of a cylindrical tank with a length of about 32 m and a boiler,
It is possible to use the maximum capacity of temperature and pressure of about 191 ° C and about 12 atm), but it is not limited to this dryer, and the wood has the same scale and capacity as this dryer. Any drying device can be used. The wind power drying device may be used by adding hot air drying equipment or cold air drying equipment to the high temperature and high pressure steam drying equipment of steam, or by using the existing wind wood drying equipment or the existing air drying equipment having both hot air drying function and steam drying function. For example, it is possible to use a wood drying device.

例１．（１回目の乾燥・高温高圧蒸気処理） 針葉樹の中からから松を選び、樹皮つき生材、剥皮生材
の両方について同一条件で試験した。試料は、樹皮つき
生材及び剥皮生材からなる板材と角材，樹皮つき生丸太
である。Example 1. (First Drying / High-Temperature / High-Pressure Steam Treatment) Pine was selected from among the coniferous trees, and tested on both bark raw material and bark raw material under the same conditions. The samples are a plate made of a raw material with bark and a stripped raw material, a timber, and a raw log with bark.

から松の生材を前記既存の乾燥装置における圧力釜に入
れ、蒸気を注入し、４時間で徐々に圧力を上げ、釜内温
度を 180℃、10気圧にし、この状態で４時間保持した
後、３時間で徐々に減圧し、常温，常圧に戻した。この
時の水分含有率は25％〜30％位であった。そして、脱脂
状態は、ヤニ成分中、揮発性のテルペンが揮発し、不揮
発性のロジンが固化しているのが確認され、完全脱脂の
状態であった。また、加色状態は、厚さ50mm，同35mm，
同24mm，同15mmの板材， 155mm四方， 105mm四方，80mm
四方の角材（板材，角材は、いずれも樹皮つき生材，剥
皮生材の両方を含む）、直径 250mmの樹皮つき生丸太の
いずれもが周辺部から中心部まで一様に褐色に加色され
た。After putting raw pine wood into the pressure cooker in the existing drying device, injecting steam, gradually increasing the pressure in 4 hours, raising the temperature in the kettle to 180 ° C. and 10 atm, and holding this state for 4 hours The pressure was gradually reduced in 3 hours, and the temperature was returned to room temperature and pressure. The water content at this time was about 25% to 30%. In the degreased state, it was confirmed that the volatile terpene was volatilized and the nonvolatile rosin was solidified in the tar component, and it was in the completely degreased state. In addition, the added color is 50mm thick, 35mm thick,
24mm, 15mm plate material, 155mm square, 105mm square, 80mm
Square timbers (both lumber and timber include both bark and bark), and bark with a diameter of 250 mm are barred uniformly from the periphery to the center. It was

例２．（２回目の乾燥・熱風による風力乾燥） 例１と同じ試料を例１の場合と同じ条件で乾燥した後、
60℃の熱風に２時間位曝してみた。その結果、水分含有
率が10％以下に減少していることが認められた。脱脂状
態及び加色状態は、例１．の場合と同様であった。Example 2. (Second Drying / Wind Drying with Hot Air) After drying the same sample as in Example 1 under the same conditions as in Example 1,
I exposed it to hot air at 60 ℃ for about 2 hours. As a result, it was confirmed that the water content was reduced to 10% or less. The degreased state and the colored state are as shown in Example 1. It was similar to the case of.

例３．（２回目の乾燥・冷風による風力乾燥） 例１と同じ試料を例１の場合と同じ条件で乾燥した後、
30℃の冷風に12時間位曝してみた。その結果、水分含有
率は例２の場合と、脱脂状態，加色状態は、例１の場合
と変化がなかった。Example 3. (Second Drying / Wind Drying with Cold Air) After drying the same sample as in Example 1 under the same conditions as in Example 1,
I exposed it to cold air at 30 ℃ for about 12 hours. As a result, the water content was the same as in Example 2, and the degreased state and the colored state were the same as in Example 1.

例４．（１回目の乾燥・高温高圧蒸気処理） 例１と同じ試料を例１と同じ手順で徐々に圧力を上げ、
釜内温度を 180℃、10気圧にし、この状態を１時間保持
した後、徐々に減圧して常温，常圧に戻した。この場合
の水分含有率は、例１の場合と同じ25％〜30％位であっ
た。そして、脱脂状態も例１の場合と同じ完全脱脂状態
であった。加色については、板材及び角材にあっては、
周辺部から中心部まで一様に加色されたが、例１の場合
の４時間保持に比べて褐色濃度が下がっていた。樹皮つ
き生丸太の加色状態は、周辺部から80mm位の深度まで加
色され、それ以上の中心部は加色されなかった。Example 4. (First drying / high-temperature high-pressure steam treatment) The same sample as in Example 1 was gradually increased in pressure in the same procedure as in Example 1,
The temperature inside the kettle was set to 180 ° C. and 10 atmospheric pressure, this state was maintained for 1 hour, and then the pressure was gradually reduced to normal temperature and normal pressure. The water content in this case was about 25% to 30% as in Example 1. The degreased state was also the same as the case of Example 1 in the completely degreased state. Regarding the addition of color, for plate and square timber,
The color was uniformly added from the peripheral portion to the central portion, but the brown density was lower than that in the case of Example 1 which was maintained for 4 hours. The raw bark with bark was colored up to a depth of about 80 mm from the peripheral part, and the central part beyond that was not colored.

例５．（２回目の乾燥・熱風による風力乾燥） 例１と同じ試料を例４の場合と同じ条件（ 180℃、10気
圧、１時間保持）で乾燥した後、例２の場合と同じ条件
（60℃の熱風で２時間）で乾燥してみたところ、水分含
有率が例２の場合と同じく10％以下に減少していること
が認められ、加色状態は例４の場合と、脱脂状態は例１
の場合と夫々同じ状態であった。Example 5. (Second Drying / Wind Drying with Hot Air) After drying the same sample as in Example 1 under the same conditions as in Example 4 (180 ° C., 10 atmospheric pressure, holding for 1 hour), the same conditions as in Example 2 (60 ° C.) When dried with hot air for 2 hours), it was confirmed that the water content decreased to 10% or less as in the case of Example 2, and the coloring state was in Example 4 and the degreasing state was in Example. 1
It was in the same state as in each case.

例６．（２回目の乾燥・冷風による風力乾燥） 例１と同じ試料を例４の場合と同じ条件（ 180℃、10気
圧、１時間保持）で乾燥した後、例３の場合と同じ条件
（30℃、12時間）で乾燥したところ、水分含有率は例２
の場合（10％以下）と、加色状態は例４の場合と、脱脂
状態は例１の場合と夫々同じ状態であった。Example 6. (Second Drying / Wind Drying with Cold Air) After drying the same sample as in Example 1 under the same conditions as in Example 4 (180 ° C., 10 atmospheric pressure, holding for 1 hour), the same conditions as in Example 3 (30 ° C. , 12 hours), the moisture content was
(10% or less), the coloring state was the same as in Example 4, and the degreasing state was the same as in Example 1.

例７．（１回目の乾燥・高温高圧蒸気処理） 例１と同じ試料を例１と同じ手順で徐々に圧力を上げ、
釜内温度を 170℃、８気圧にし、４時間保持した後、徐
々に減圧して常温、常圧に戻した。その結果、総ての試
料が周辺部から中心部まで一様に加色されたが、濃度は
例４の場合（ 180℃、10気圧、１時間保持）に比してさ
らに下がっていた。乾燥状態は例１の場合と同じ（水分
含有率25％〜30％）であり、脱脂状態も例１と同じ（完
全脱脂）であった。Example 7. (First drying / high-temperature high-pressure steam treatment) The same sample as in Example 1 was gradually increased in pressure in the same procedure as in Example 1,
The temperature inside the kettle was adjusted to 170 ° C. and 8 atm, and the temperature was maintained for 4 hours. Then, the pressure was gradually reduced to normal temperature and normal pressure. As a result, all the samples were uniformly colored from the peripheral part to the central part, but the density was lower than that in the case of Example 4 (180 ° C., 10 atmospheric pressure, 1 hour holding). The dry state was the same as in Example 1 (water content 25% to 30%), and the degreased state was also the same as in Example 1 (complete degreasing).

例８．（２回目の乾燥・熱風による風力乾燥） 例１と同じ試料を例７の場合と同じ条件（ 170℃、８気
圧、４時間保持）で処理した後、例２の場合と同じ条件
（60℃の熱風で２時間）で乾燥した。その結果、水分含
有率が例２の場合と同じ10％以下に減少し、加色状態は
例７と、脱脂状態は例１の場合と夫々同じ結果であっ
た。Example 8. (Second Drying / Wind Drying with Hot Air) After treating the same sample as in Example 1 under the same conditions as in Example 7 (170 ° C., 8 atmospheric pressure, holding for 4 hours), the same conditions as in Example 2 (60 ° C.) With hot air for 2 hours). As a result, the water content was reduced to 10% or less, which was the same as in Example 2, and the color addition state was the same as that of Example 7 and the degreasing state was the same as that of Example 1.

例９．（２回目の乾燥・冷風による風力乾燥） 例１と同じ試料を例７の場合と同じ条件（ 170℃、８気
圧、４時間保持）で処理した後、例３の場合と同じ条件
（30℃、12時間）で乾燥した。その結果、水分含有率は
例２の場合（10％以下）と、加色状態は例７の場合と、
脱脂状態は例１の場合と夫々同じであった。Example 9. (Second Drying / Wind Drying with Cold Air) After treating the same sample as in Example 1 under the same conditions as in Example 7 (170 ° C., 8 atmospheric pressure, holding for 4 hours), the same conditions as in Example 3 (30 ° C. , 12 hours). As a result, the water content was as in Example 2 (10% or less), and the coloring state was as in Example 7,
The degreased state was the same as in Example 1, respectively.

例10．（１回目の乾燥・高温高圧蒸気処理） 例１と同じ試料を例１と同じ手順で徐々に圧力を上げ、
釜内温度を 150℃、５気圧にし、この状態を４時間保持
した後、徐々に減圧して常温、常圧に戻した。その結
果、乾燥状態及び脱脂状態は、例１の場合と同じ結果が
得られたが、加色状態については、濃度がさらに下が
り、黄色味を中心とする琥珀色になり、深度が樹皮つき
丸太（直径 250mm）で周辺部から50mm位、 155mm四方及
び 105mm四方の角材では中心部が加色されずに残った。Example 10. (First drying / high-temperature high-pressure steam treatment) The same sample as in Example 1 was gradually increased in pressure in the same procedure as in Example 1,
The temperature inside the kettle was set to 150 ° C. and 5 atmospheres, this state was maintained for 4 hours, and then the pressure was gradually reduced to normal temperature and normal pressure. As a result, the same results as in the case of Example 1 were obtained in the dry state and the defatted state, but in the color-added state, the concentration was further reduced, the color became amber with a yellowish center, and the depth was a log with bark. With a diameter of 250 mm, the center of the square timbers of about 50 mm, 155 mm square and 105 mm square from the periphery remained uncolored.

例11．（２回目の乾燥・熱風による風力乾燥） 例１と同じ試料を例10の場合と同一条件（ 150℃、５気
圧、４時間保持）で処理した後、例２の場合と同一条件
（60℃の熱風で２時間）で乾燥してみた。その結果は、
水分含有率が例２の場合と同じく10％以下に減少してい
た。加色状態は、濃度及び深度とも例10の場合と同じ状
態であり、脱脂状態は、例１の場合と同じ状態（完全脱
脂）であった。Example 11. (Second drying / wind drying with hot air) After treating the same sample as in Example 1 under the same conditions as in Example 10 (150 ° C, 5 atmospheric pressure, holding for 4 hours), the same conditions as in Example 2 (60 ° C) It was dried with hot air for 2 hours). The result is
The water content was reduced to 10% or less as in the case of Example 2. The color-added state was the same as the case of Example 10 in both density and depth, and the degreased state was the same as that of Example 1 (complete degreasing).

例12．（２回目の乾燥・冷風による風力乾燥） 例１と同じ試料を例10の場合と同じ条件（ 150℃、５気
圧、４時間保持）で処理した後、例３の場合と同じ条件
（30℃、12時間）で乾燥してみた。その結果、水分含有
率が例２の場合と同じ（10％以下）であり、加色状態が
例10の場合と変化なく、脱脂状態が例１の場合と同じ
（完全脱脂）であった。Example 12. (Second drying, wind drying with cold air) After treating the same sample as in Example 1 under the same conditions as in Example 10 (150 ° C, 5 atmospheric pressure, holding for 4 hours), the same conditions as in Example 3 (30 ° C) , 12 hours) and dried. As a result, the water content was the same as in Example 2 (10% or less), the coloring state was the same as in Example 10, and the degreased state was the same as in Example 1 (complete degreasing).

例13．（１回目の乾燥・高温高圧蒸気処理） 例１と同じ試料を例１と同じ手順で徐々に圧力を上げ、
釜内温度を 150℃、５気圧にし、この状態を１時間保持
した後、徐々に減圧して常温，常圧に戻した。その結
果、乾燥状態及び脱脂状態は、例１の場合と同じであっ
た。加色状態は、濃度が例10の場合の琥珀色よりもさら
に下がり、深度が樹皮つき丸太（直径 250mm）で周辺部
から30mm位、80mm四方、 155mm四方， 105mm四方の角材
では中心部が加色されずに残った（２回目の乾燥は行な
われなかった）。Example 13. (First drying / high-temperature high-pressure steam treatment) The same sample as in Example 1 was gradually increased in pressure in the same procedure as in Example 1,
The temperature inside the kettle was set to 150 ° C. and 5 atm, and this state was maintained for 1 hour, then the pressure was gradually reduced to normal temperature and normal pressure. As a result, the dry state and the degreased state were the same as in the case of Example 1. The added color was lower than the amber color when the density was Example 10, and the depth was about 30 mm from the peripheral part with logs with bark (diameter 250 mm), 80 mm square, 155 mm square, 105 mm square, and the central part was added. It remained uncolored (no second drying was done).

なお、例１と同じ試料を例１と同じ手順で 150℃、５気
圧以下という条件のもとに試験してみたところ、効果的
な加色状態を得ることができなかった。When the same sample as in Example 1 was tested under the same procedure as in Example 1 under the conditions of 150 ° C. and 5 atm or less, an effective color addition state could not be obtained.

以上の結果から、乾燥及び樹脂は、２回の乾燥工程を含
めて考えた場合、設定温度，設定時間に相関するとは限
らないが、加色は、濃度が１回目の乾燥工程の設定温度
に、深度が該乾燥工程の設定時間に夫々相関することが
判明した。From the above results, when considering the drying and the resin including the two drying steps, the added color does not always correlate with the set temperature and the set time. It was found that the depth correlates with the set time of the drying process.

から松のほか、針葉樹では、えぞ松，とど松，広葉樹で
は、なら，かば，たもなどについて上記各実施例と同様
の条件で試験した結果、加色度合，乾燥度合に夫々違い
があったが、とくに加色手段としては有効であった。In addition to Kara pine, coniferous trees, Ezo pine, Todo pine, and broad-leaved trees were tested under the same conditions as in each of the above-mentioned examples, and as a result, the degree of addition and the degree of dryness were different. However, it was particularly effective as a coloring means.

次に、実施例１，４，７，10，13（いずれも１回目の乾
燥）を表１として、実施例２，５，８，11（いずれも２
回目の乾燥・熱風）を表２として、実施例３，６，９，
12（いずれも２回目の乾燥・冷風）を表３として、夫々
下記する。（これらの表において、加色濃度の表記につ
いては、１が薄琥珀色、２が濃琥珀色、３が薄褐色、４
が濃褐色である。加色濃度については、直径 250mmの樹
皮つき丸太表面からの深度を示す） 発明の効果 本発明は、叙上の如く構成したので、以下の効果を奏す
る。Next, Examples 1, 4, 7, 10, and 13 (all are the first drying) are shown in Table 1, and Examples 2, 5, 8, and 11 (all are 2).
The second drying / hot air is shown in Table 2, and the results of Examples 3, 6, 9 and
Table 3 shows 12 (both dry and cold winds for the second time), respectively. (In these tables, as for the notation of additive color density, 1 is a light amber color, 2 is a dark amber color, 3 is a light brown color, 4
Is dark brown. The color density is the depth from the surface of a log with a bark of 250 mm in diameter.) EFFECTS OF THE INVENTION Since the present invention is configured as described above, it has the following effects.

１．１回の乾燥で生材時の水分含有率を多くて30％位ま
で乾燥できると共に、脱脂では完全脱脂を行なうことが
できる。The water content in raw material can be increased to about 30% by drying once, and the degreasing can be completely degreased.

２．２回の乾燥で上記水分含有率を10％以下に乾燥する
ことができる。2. The water content can be dried to 10% or less by drying twice.

３．加色では、加圧による温度の内部浸透と平衡とがは
かられ、木材の周辺部又は周辺部から中心部まで褐色も
しくは褐色の近似色に加色することができる。3. In the color addition, the internal permeation and equilibrium of the temperature by pressurization are balanced, and it is possible to add a brown color or an approximate brown color from the peripheral portion or the peripheral portion to the central portion of the wood.

４．加色では、設定温度と設定気圧、処理時間を任意に
決定することにより、琥珀色から褐色まで段階的な色を
引出すことができる。このことにより、針葉樹でから松
の場合、自然色の赤味を解消し得、同時に自然変色，白
太，赤太の色差といった問題を解消せしめ得る。4. In the addition of colors, it is possible to draw out a stepwise color from amber to brown by arbitrarily setting the set temperature, the set atmospheric pressure, and the processing time. As a result, in the case of coniferous to pine trees, the reddishness of the natural color can be eliminated, and at the same time, the problems such as natural discoloration, the color difference between white and red, can be eliminated.

５．高温度処理によって微炭化作用が奏され、被加工木
材に防腐性を付与することができる。5. The high temperature treatment exerts a slight carbonization effect, and can impart antiseptic properties to the processed wood.

６．高温度処理と微炭化作用とにより、木材本来の物理
作用を弱め、捻れなどの狂い発生を防止することができ
る。このことによって、被加工木材を建材，工芸材など
といった用途に提供でき、需要分野を拡大することがで
きる。6. By the high temperature treatment and the slight carbonization action, it is possible to weaken the original physical action of wood and prevent the occurrence of distortion such as twisting. As a result, the processed wood can be provided for applications such as building materials and craft materials, and the demand fields can be expanded.

従って、減圧時間を含めて２回目の乾燥が冷風乾燥の場
合の最長19時間位というこれまでにない短かい処理期間
で諸種の問題点を解決することができる。Therefore, various problems can be solved in the shortest treatment period of up to 19 hours when the second drying is cold air drying including decompression time.

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】木材を常温、常圧から150 ℃〜180 ℃に加
熱しながら、５気圧〜10気圧に加圧して高温高圧蒸気処
理する木材の乾燥方法。1. A method for drying wood, which comprises heating wood at normal temperature and atmospheric pressure to 150 ° C. to 180 ° C., pressurizing it to 5 atm to 10 atm, and treating it with high temperature and high pressure steam. 【請求項２】木材を常温、常圧から150 ℃〜180 ℃に加
熱しながら、５気圧〜10気圧に加圧して高温高圧蒸気処
理した後で風力乾燥する木材の乾燥方法。2. A method for drying wood, wherein the wood is heated to normal temperature and atmospheric pressure from 150 ° C. to 180 ° C., pressurized to 5 atm to 10 atm, subjected to high-temperature and high-pressure steam treatment, and then air-dried. 【請求項３】木材を常温、常圧から150 ℃〜180 ℃に加
熱しながら、５気圧〜10気圧に加圧して高温高圧蒸気処
理することにより、木材の周辺部又は周辺部から中心部
までを褐色に加色する木材乾燥時における加色加工方
法。3. Wood is heated from room temperature and atmospheric pressure to 150 ° C. to 180 ° C. while being pressurized to 5 atm to 10 atm and subjected to high-temperature and high-pressure steam treatment, so that the peripheral part of the wood or the peripheral part to the central part of the wood is processed. Addition method to add brown color to wood when drying. 【請求項４】針葉樹からなる木材を常温、常圧から150
℃〜180 ℃に加熱しながら、５気圧〜10気圧に加圧して
高温高圧蒸気処理することにより、揮発成分を揮発せし
めると共に、不揮発成分を固化せしめる木材乾燥時にお
ける脱脂加工方法。4. A coniferous wood is kept at room temperature and atmospheric pressure for 150 times.
A degreasing method for drying wood, in which a volatile component is volatilized and a non-volatile component is solidified by pressurizing to 5 atm to 10 atm while heating at ℃ to 180 ° C to perform high-temperature high-pressure steam treatment.