JPH0430321B2 - - Google Patents
Info
- Publication number
- JPH0430321B2 JPH0430321B2 JP58203480A JP20348083A JPH0430321B2 JP H0430321 B2 JPH0430321 B2 JP H0430321B2 JP 58203480 A JP58203480 A JP 58203480A JP 20348083 A JP20348083 A JP 20348083A JP H0430321 B2 JPH0430321 B2 JP H0430321B2
- Authority
- JP
- Japan
- Prior art keywords
- decolorization
- curing
- temperature
- wood
- relative humidity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000004042 decolorization Methods 0.000 claims description 26
- 239000002023 wood Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 11
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 9
- 238000001723 curing Methods 0.000 description 25
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000007864 aqueous solution Substances 0.000 description 5
- 238000004043 dyeing Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 235000015392 Sesbania grandiflora Nutrition 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 241001337993 Agathis <wasp> Species 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 244000112572 Sesbania bispinosa Species 0.000 description 1
- 235000010896 Sesbania bispinosa Nutrition 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Chemical And Physical Treatments For Wood And The Like (AREA)
Description
【発明の詳細な説明】 〔技術分野〕 この発明は、木材の脱色法に関する。[Detailed description of the invention] 〔Technical field〕 This invention relates to a method for decolorizing wood.
住宅の内装材等として、従来より、表面に木目
が表現された木材が好んで使用される。しかし、
自然銘木を多く使用するとなれば非常に高価にな
るので、一般には、表面に人工の化粧単板が貼着
された建材が主に使用されている。人工化粧単板
は、安価な樹木の製材からスライスされた素材単
板に脱脂、脱色および染色を施し、これを積層成
形した集成フリツチを得、これをスライスするこ
とによつて得られる。脱色は、脱脂などの前処理
をした素材単板に過酸化水素（以下、「H2O2」と
略記する）を塗布し、スチーム雰囲気中で養生し
て脱色する方法が行なわれている。しかし、この
ような脱色では、スチーム温度を高温にして行な
う場合、脱色程度の良いものを短時間で得ること
ができるが、そのまま脱色を継続すると逆に色戻
りが発生し、脱色度が低下するという問題があ
る。このため、脱色が終了するとすぐ湯洗処理な
う必要があり、脱色工程の管理が難しく大変であ
つた。
BACKGROUND ART Wood with wood grains expressed on its surface has traditionally been used favorably as interior material for houses. but,
Since using a large amount of natural wood would be extremely expensive, building materials with artificial decorative veneers pasted on the surface are generally used. Artificial decorative veneers are obtained by degreasing, decolorizing, and dyeing material veneers sliced from inexpensive lumber from trees, laminating and molding them to form laminated fritches, and slicing this. Decolorization is carried out by applying hydrogen peroxide (hereinafter abbreviated as "H 2 O 2 ") to a veneer of material that has undergone pretreatment such as degreasing, and curing it in a steam atmosphere. However, in this type of decolorization, if the steam temperature is set to a high temperature, a product with a good degree of decolorization can be obtained in a short time, but if the decolorization is continued as it is, color reversion occurs and the degree of decolorization decreases. There is a problem. For this reason, it was necessary to carry out hot water washing immediately after the decolorization was completed, making it difficult and difficult to manage the decolorization process.
また、このような障害を避けるために、低温ス
チーム中で養生脱色を行なうことが考えられた。
しかし、このような条件では、脱色がゆるやかに
行なわれるため、時間が長くなり管理し易くなる
反面、脱色能力が低下して高い脱色度のものが得
られないという欠点があつた。 Furthermore, in order to avoid such problems, it has been considered to carry out curing decolorization in low-temperature steam.
However, under such conditions, decolorization is carried out slowly and takes a long time, making it easier to manage, but on the other hand, there is a drawback that the decolorization ability is reduced and a high degree of decolorization cannot be obtained.
（発明の目的）
この発明は、このような事情に鑑みなされたも
ので、高い脱色度が適切な状態で達成でき、脱色
工程の管理が容易な木材の脱色法を提供すること
を目的とする。(Objective of the Invention) This invention was made in view of the above circumstances, and an object thereof is to provide a method for decolorizing wood that can achieve a high degree of decolorization in an appropriate state and that allows easy control of the decolorization process. .
発明者は、上記目的を達成するために鋭意検討
した。その結果、この発明を改正するに至つた。
The inventor made extensive studies to achieve the above object. As a result, this invention has been revised.
この発明は、木材に過酸化水素を塗布した後、
スチーム中に放置して養生する脱色法において、
第１段は、温度90〜100℃、関係湿度90〜100％で
30分〜３時間とし、第２段は、温度５〜30℃で関
係湿度90〜100％で数日間として養生することを
特徴とする木材の脱色法をその要旨としている。 In this invention, after applying hydrogen peroxide to wood,
In the decolorization method, which is left in steam to cure,
The first stage is at a temperature of 90-100℃ and relative humidity of 90-100%.
The duration is 30 minutes to 3 hours, and the second stage is a method for decolorizing wood, which is characterized by curing for several days at a temperature of 5 to 30° C. and relative humidity of 90 to 100%.
以下に、これについて詳細に説明する。 This will be explained in detail below.
この発明において使用する木材は、その種類、
大きさなどを問わない。また、木材の前処理の有
無も問わないが、通常はアルカリ液を十分浸透養
生させて脱脂したものを用いる。 The type of wood used in this invention,
No matter the size. Furthermore, it does not matter whether or not the wood has been pretreated, but usually wood that has been thoroughly cured with an alkaline solution and degreased is used.
先ず、H2O2水溶液をひき板、単板などからな
る木材表面に塗布した後、第１段として高温のス
チーム雰囲気中に木材を放置する。この時の温湿
度は、温度90〜100℃、関係湿度90〜100％であ
る。この状態で最高の脱色が得られるまでスチー
ム養生を行なう。木材によつて差異はあるが、30
分〜３時間の範囲で脱色するようになる。なお、
養生中は、ラツプ（被包）をしておくとより高い
脱色度のものが得られる。最高の脱色状態となつ
た時点で、ただちに、第２段としての低温のスチ
ーム雰囲気中に木材を放置する。この時の温湿度
は、温度５〜30℃、関係湿度90〜100％である。
実施例にみるように、数日間、この状態で放置す
ると、色戻りすることなく、最高の脱色状態を維
持することができるようになる。 First, an aqueous H 2 O 2 solution is applied to the surface of a wood made of sawnboard, veneer, etc., and then, as a first step, the wood is left in a high-temperature steam atmosphere. The temperature and humidity at this time are 90-100°C and relative humidity 90-100%. In this state, steam curing is performed until the best decolorization is achieved. Although there are differences depending on the wood, 30
The color begins to fade in a range of minutes to 3 hours. In addition,
A higher degree of decolorization can be obtained by wrapping the product during curing. Immediately after reaching the highest level of decolorization, the wood is left in a low-temperature steam atmosphere as the second stage. The temperature and humidity at this time are 5-30°C and relative humidity 90-100%.
As shown in the examples, if the product is left in this state for several days, the best decolorization state can be maintained without color reversion.
養生脱色中の関係温度は、前記の如く常に高湿
の状態にしておくことが好ましい。養生中に乾燥
するようなことになると、H2O2が分解して脱色
度が低下したり、単板などの薄層板は割れを生じ
たりするからである。また、脱色後の染色工程を
考慮しても、含水率が高く、かつ含水率ムラの少
ない方が染ムラが少なくなるので、養生脱色中の
高湿状態が望ましいのである。 It is preferable that the relevant temperature during curing and decolorization is always kept in a high humidity state as described above. This is because if drying occurs during curing, H 2 O 2 will decompose and the degree of decolorization will decrease, and thin laminates such as veneer will crack. Furthermore, even when considering the dyeing process after decolorization, high humidity conditions during curing and decolorization are desirable because the higher the moisture content and the less uneven the moisture content is, the less uneven dyeing will be.
木材の積層については、１枚でも多数枚積層で
もよく、特に限定されるものではないが、積層枚
数の厚みが20cm程度以上になると、積層物の中心
部の温度が低下しにくくなるので、早目に第２段
の低温スチーム雰囲気へ移行させるか、積層時に
放熱板を適宜介在させるようにしてもよい。 Regarding the lamination of wood, it may be one piece or many pieces, and there is no particular limitation, but if the thickness of the number of laminated pieces is about 20 cm or more, the temperature at the center of the laminate will be difficult to drop, so it should be done quickly. Alternatively, a heat sink may be appropriately interposed during lamination.
この発明で使用するH2O2は、濃度、塗布量、
塗布方法など特に限定されるものではない。ま
た、発明の効果を妨げない範囲において、H2O2
に他の添加物を含有させてもよい。 The concentration, amount of H 2 O 2 used in this invention,
The coating method is not particularly limited. In addition, H 2 O 2 to the extent that it does not impede the effects of the invention.
may contain other additives.
以下に、実施例について説明する。 Examples will be described below.
（実施例 １）
厚み1.8mm、長さ1800mm、幅300mmの建材用松単
板100枚を準備した。まず、単板にNaOH2％水
溶液を100g／m2となるように単板両面に塗布し、
室温で20時間以上養生した。次いで、H2O250％
水溶液を単板両面に100g／m2となるように塗布
してこれを積層し、直ちに温度100℃、関係湿度
98％のスチーム雰囲気中（養生室）に入れ、１時
間養生脱色した。その後、積層した状態で温度30
℃、関係湿度98％のスチーム雰囲気中（養生室）
に入れ、７日間養生放置した。養生後の単板は、
全く色戻りすることなく十分に脱色されていた。
また、単板は、含水率のバラツキが少なく、乾燥
することがなかつたので割れの発生も認められな
かつた。(Example 1) 100 pine veneers for building materials with a thickness of 1.8 mm, a length of 1800 mm, and a width of 300 mm were prepared. First, a 2% NaOH aqueous solution was applied to both sides of the veneer at a concentration of 100 g/ m2 .
It was cured at room temperature for more than 20 hours. Then H2O2 50 %
Apply an aqueous solution to both sides of the veneer at a concentration of 100 g/m 2 and laminate it, then immediately at a temperature of 100°C and relative humidity.
It was placed in a 98% steam atmosphere (curing room) and cured for 1 hour to decolorize. After that, the temperature in the stacked state is 30℃.
℃, in a steam atmosphere with relative humidity of 98% (curing room)
and left to cure for 7 days. After curing, the veneer is
The color was sufficiently bleached without any color reversion.
Furthermore, the veneer had little variation in moisture content and did not dry out, so no cracking was observed.
（実施例 ２）
厚み1.0mm、長さ800mm、幅200mmのアガチスひ
き板の片面に、NaOH2.5％水溶液を60g／m2塗布
し、上からラツプした状態で室温で20時間以上養
生した。次いで、ラツプを外してNaOH2.5水溶
液が塗布された片面にH2O235％水溶液を単板両
面に60g／m2となるように塗布し、上からラツプ
した状態で温度100℃、関係湿度90％のスチーム
雰囲気中（養生室）に入れ、１時間養生脱色し
た。その後、この状態で温度30℃、関係湿度90％
のスチーム雰囲気中（養生室）に入れ、７日間養
生放置した。養生後のアガチスひき板は、全く色
戻りすることなく十分に脱色されたものであつ
た。(Example 2) 60 g/m 2 of a 2.5% NaOH aqueous solution was applied to one side of an agathis board with a thickness of 1.0 mm, a length of 800 mm, and a width of 200 mm, and the board was wrapped and cured at room temperature for 20 hours or more. Next, the wrap was removed and a 35% H 2 O 2 aqueous solution was applied to both sides of the veneer at a concentration of 60 g/m 2 on one side that had been coated with the NaOH2.5 aqueous solution. It was placed in a steam atmosphere (curing room) with a humidity of 90%, and cured for 1 hour to decolorize it. After that, in this state, the temperature is 30℃ and the relative humidity is 90%.
The sample was placed in a steam atmosphere (curing room) and left to cure for 7 days. After curing, the Agatis sawn board was sufficiently bleached without any color reversion.
この発明にかかる木材の脱色法は、塗布方式と
養生方式の併用であるため、材料、エネルギーな
どの費用が最低で済むのでコストダウンが図れる
のに加え、下記の有用な効果をも奏する。
Since the method for decolorizing wood according to the present invention uses both a coating method and a curing method, the cost of materials, energy, etc. can be kept to a minimum, so not only can costs be reduced, but also the following useful effects can be achieved.
ａ 高い脱色度が達成できる。a High degree of decolorization can be achieved.
これは、第１段は高温で養生し、ずつと高温
養生を続けるのではなく、第２段では低温で養
生するため、色戻りが起こらず高温での高い脱
色状態が維持されるからである。 This is because the first stage is cured at a high temperature and the high temperature curing is not continued step by step, but the second stage is cured at a low temperature, so color reversion does not occur and the high decolorization state at high temperatures is maintained. .
ｂ 高含水率で含水率ムラが少なくなり、染ムラ
のない染色を可能とする。b High moisture content reduces moisture content unevenness and enables dyeing without uneven dyeing.
これは、養生を関係湿度90〜100％という高
湿度下で行うからである。 This is because curing is performed under high relative humidity of 90-100%.
ｃ 養生中に木材に割れが入らない。c The wood does not crack during curing.
これも、養生を関係湿度90〜100％という高
湿度下で行うからである。養生を低湿度下で行
うと乾燥し過ぎて割れが生じ易い。 This is also because curing is performed under high relative humidity of 90 to 100%. If curing is performed at low humidity, it will become too dry and cracks will easily occur.
ｄ 養生中、過酸化水素は十分な脱色作用を発揮
する。d During curing, hydrogen peroxide exerts sufficient decolorizing action.
これも、養生を関係湿度90〜100％という高
湿度下で行うからである。養生を低湿度下で行
うと乾燥によりH2O2が分解し脱色作用が弱ま
る。 This is also because curing is performed under high relative humidity of 90 to 100%. If curing is performed at low humidity, H 2 O 2 will decompose due to drying and the decolorizing effect will be weakened.
ｅ 脱色工程の調製管理が非常にやり易くなる。e It becomes very easy to manage the preparation of the decolorization process.
これは、第２段の低温での養生は長期間の放
置が可能となるからである。 This is because curing at a low temperature in the second stage allows for long-term storage.
ｆ 上記効果ａ〜ｅが確実に得られる。これは、
養生条件の設定が常に適切なものとなるからで
ある。つまり、第１段は「温度90〜100℃、関
係湿度90〜100％で30分〜３時間」、そして、第
２段は「温度５〜30℃、関係湿度90〜100％で
数日間」という適切な環境条件の下で養生され
るのである。f The above effects a to e are reliably obtained. this is,
This is because the curing conditions are always set appropriately. In other words, the first step is ``30 minutes to 3 hours at a temperature of 90 to 100℃ and relative humidity of 90 to 100%,'' and the second step is ``several days at a temperature of 5 to 30℃ and relative humidity of 90 to 100%.'' They are cultivated under appropriate environmental conditions.
Claims (1)
に放置して養生する脱色法において、第１段は、
温度90〜100℃、関係湿度90〜100％で30分〜３時
間とし、第２段は、温度５〜30℃、関係湿度90〜
100％で数日間として養生することを特徴とする
木材の脱色法。1 In the decolorization method in which hydrogen peroxide is applied to wood and then left to cure in steam, the first step is
The temperature is 90-100℃ and relative humidity is 90-100% for 30 minutes to 3 hours.The second stage is at 5-30℃ and relative humidity is 90-100%.
A method of decolorizing wood that is characterized by curing at 100% for several days.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20348083A JPS6094303A (en) | 1983-10-28 | 1983-10-28 | Method of decoloring wood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20348083A JPS6094303A (en) | 1983-10-28 | 1983-10-28 | Method of decoloring wood |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6094303A JPS6094303A (en) | 1985-05-27 |
| JPH0430321B2 true JPH0430321B2 (en) | 1992-05-21 |
Family
ID=16474840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20348083A Granted JPS6094303A (en) | 1983-10-28 | 1983-10-28 | Method of decoloring wood |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6094303A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59192515A (en) * | 1983-04-15 | 1984-10-31 | 松下電工株式会社 | Method of decoloring woody veneer |
-
1983
- 1983-10-28 JP JP20348083A patent/JPS6094303A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59192515A (en) * | 1983-04-15 | 1984-10-31 | 松下電工株式会社 | Method of decoloring woody veneer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6094303A (en) | 1985-05-27 |
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