JP2018197643A - Method of drying japanese cedar board at low temperature, capable of decreasing moisture content in japanese cedar board down to about 10% - Google Patents

Abstract

To make a Japanese cedar board nearly free from deformation (warp, crack or the like) caused by absorbing moisture in air, which is a characteristic of timber, and suitable for use in a variety of applications.SOLUTION: First, drying of Japanese cedar boards is started using a dryer and is continued for 27 operating days at a rate of 9 hours a day using the dryer (the drying schedule is confirmed every time), while supplying the dryer with steam for drying from an in-house boiler. Second, the degree of drying is checked on the 26th day and the 27th day of the operating days by measuring the moisture content thereof using an in-house measuring apparatus, which is carried out by temporarily stopping the dryer and entering thereinto from a checking door of the dryer (to prevent the timber from contacting air present outside the dryer to an extent practicable), and if the moisture content reaches a specified value (8 to 10%), the drying by the dryer is finished at the 27th day of the operating days.SELECTED DRAWING: Figure 1

Description

The present invention is a technique for making warpage and cracking less likely to occur when cedar is used for housing building materials and furniture.

木材独特の空気中の水分を含んでの材料の形状の変化（反り・ワレ等）がほとんどなく、様々な用途に板材として使用可能な材料に生まれ変わります。Cedar is often used for construction and furniture, but most cedar has a moisture content of around 20%. However, when our cedar board material low-temperature drying method is performed,

There is almost no change in the shape (warp, crack, etc.) of the material containing moisture in the air unique to wood, and it will be reborn as a material that can be used as a plate for various purposes.

The content of the invention

空気に触れないため）含水率を計測する。
含水率が所定の数値（８〜１０％）に達してた場合は稼働日２７日目で乾燥機での乾燥終了。
７、養生期間
乾燥機での乾燥終了の翌日には、乾燥機の扉の下部を約１００ｍｍ開けて１日養生させる（すぐに乾燥機から外に出すと乾燥させた杉材が急激に空気中の水分を吸って含水率が所定の数値を超えるのを防ぐため）
８、乾燥終了
養生期間を過ぎた杉材は時間が経過しても含水率１２％を超えることなく、家具や建材と様々な用途に使用可能になります。
◎木材の含水率を低くする理由
基本的に木材は空気中の水分を吸収して、建材や製品になった後でもその水分で反りなど形状変化が生じやすい。
含水率を抑えることで、反りや形状変化が極力起こりにくい材料へと変わります。

Cedar board material low-temperature drying procedure 1. When purchasing cedar wood, the water content (*) is 30-40%.
* Moisture content in wood
Generally 18-20% for building materials
For furniture, around 10% 2, piled at the time of arrival of cedar materials, so in order to create a gap between each piece of board material, piers (25mm square × 1.500mm) for each cedar material about Place cedars on top of each other at intervals of 90 cm, and again place a pier.
This is repeated so that the height does not exceed 1 m. In addition, two to three sheets are arranged so that the width does not exceed 1.5 m. The time interval is at least 50 mm.
3. In the wood dryer, avoid gaps as much as possible in the dryer. If there is a gap, put your own timber.
4. Fill in the drying schedule (see attached sheet)
5. Start drying Start drying with a dryer.
Dry in a dryer for 9 days a day for 27 days. (Check the drying schedule each time)
Steam for drying is sent from the company's boiler.
6. The moisture content was measured with a measuring instrument (manufactured by KETT Kagaku Co., Ltd.) on the 26th and 27th working days of the dryness confirmation.

Measure moisture content (because it is not exposed to air)
When the moisture content has reached a predetermined value (8 to 10%), the drying in the dryer is completed on the 27th day of operation.
7. Curing period On the day following the end of drying in the dryer, open the lower part of the dryer's door about 100 mm and let it cure for 1 day. To prevent moisture content from exceeding the specified value by sucking
8. Cedar wood that has passed the dry curing period can be used for various purposes such as furniture and building materials without exceeding 12% moisture content even if time passes.
◎ Reason for reducing the moisture content of wood Basically, wood absorbs moisture in the air, and even after it becomes a building material or product, its moisture tends to cause shape changes such as warping.
By suppressing the moisture content, the material is changed to a material that is less likely to warp or change shape.

The present invention is a technique for making warpage and cracking less likely to occur when cedar board materials are used for residential building materials and furniture.

木材独特の空気中の水分を含んでの材料の形状の変化（反り・ワレ等）がほとんどなく、様々な用途に板材として使用可能な材料に生まれ変わります。Cedar board materials are often used in construction and furniture, but most cedar board materials have a moisture content of around 20%. However, when our cedar board material low-temperature drying method is performed,

There is almost no change in the shape (warp, crack, etc.) of the material containing moisture in the air unique to wood, and it will be reborn as a material that can be used as a plate for various purposes.

The content of the invention

Cedar board material low-temperature drying procedure 1. When purchasing cedar wood, the water content (*) is 30-40%.
* Moisture content in wood
Generally 18-20% for building materials
For furniture, around 10% 2, piled at the time of arrival of cedar materials, so in order to create a gap between each piece of board material, piers (25mm square × 1.500mm) for each cedar material about Place cedars on top of each other at intervals of 90 cm, and again place a pier.
This is repeated so that the height does not exceed 1 m. In addition, two to three sheets are arranged so that the width does not exceed 1.5 m. The time interval is at least 50 mm.
3. In the wood dryer, avoid gaps as much as possible in the dryer. If there is a gap, put your own timber.
4. Fill in the drying schedule (see attached sheet)
5. Start drying Start drying with a dryer.
Dry in a dryer for 9 days a day for 27 days. (Check the drying schedule each time)
Steam for drying is sent from the company's boiler.
6. The moisture content was measured with a measuring instrument (manufactured by KETT Kagaku Co., Ltd.) on the 26th and 27th working days of the dryness confirmation.
Temporarily stop the dryer and enter the dryer through the dryer door (because wood does not touch the air outside the dryer as much as possible) and measure the moisture content.
When the moisture content has reached a predetermined value (8 to 10%), the drying in the dryer is completed on the 27th day of operation.
7. Curing period On the day following the end of drying in the dryer, open the lower part of the dryer's door about 100 mm and let it cure for 1 day. To prevent moisture content from exceeding the specified value by sucking
8. Cedar wood that has passed the dry curing period can be used for various purposes such as furniture and building materials without exceeding 12% moisture content even if time passes.
◎ Reasons for reducing the moisture content of wood Basically, wood absorbs moisture in the air, and even after it becomes a building material or product, its moisture tends to cause shape changes such as warping.
By suppressing the moisture content, the material is changed to a material that is less likely to warp or change shape.

The cedar boards are stacked as shown in Fig. 1 for artificial drying (dryer) and natural drying. Figure 1 shows the front view when stacked. Figure 2 is a side view when stacked.

Claims (1)

(1) Stacked Oita Hita cedar plate materials (moisture content 30% to 40%, thickness 30-50mm, width 300-400mm) up and down at intervals of about 30mm, and then in-house Installed in a wood dryer (Asahi Dynamic Heat Co., Ltd.).
(2) A low temperature drying method for drying at a dry bulb temperature of 60 ° C. to 75 ° C. for 200 hours / month or more to dry the cedar wood to a moisture content of 8 to 10%.

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