KR20100013726A

KR20100013726A - Method for drying wood

Info

Publication number: KR20100013726A
Application number: KR1020080075373A
Authority: KR
Inventors: 이형우
Original assignee: 전남대학교산학협력단
Priority date: 2008-08-01
Filing date: 2008-08-01
Publication date: 2010-02-10

Abstract

PURPOSE: A wood drying method using a steam vapor and micro wave method is provided to minimize drying stress by the water content and temperature difference of timber in a furnace and maintaining the drying speed of the timber. CONSTITUTION: A wood drying method using a steam vapor and micro wave method includes the following steps: injecting vapor while irradiating a microwave into a drying furnace while maintaining the water content of the timber to uniformly dry the timber; maintaining the temperature of the timber in a range of 60~130°C; maintaining the humidity of the drying furnace over 99% or more; and drying the timber while discharging the air inside the drying furnace after blocking inflow of the vapor.

Description

Wood drying method combining steam cooker and microwave method {METHOD FOR DRYING WOOD}

The present invention relates to a wood drying method of a combination of steam steam and microwave method, and more specifically, to modify the wood to be dried by using a steam steam method and a microwave method, that is, splitting, surface bursting, torsion, etc. It relates to a method of drying wood so that it can be minimized.

Generally, there are two methods of drying wood: natural drying and hot drying. Natural drying is a method of stacking wood in a drying room and drying it using air temperature, humidity, and wind. The advantages are relatively simple and no special skills are required. However, it is affected by natural conditions such as seasons or climates, and in particular, the drying time is too long, and even if it is dried for a long time, there is a disadvantage that it cannot be dried below the dry moisture content.

In order to solve this problem, it is practically used to dry wood by artificial heat, which is a method of drying the wood by artificially adjusting the drying conditions such as temperature, humidity and wind speed of the drying room. It is useful because it can dry to low moisture content.

However, this too can not avoid the disadvantage that the deformation of the wood occurs frequently because the drying faster than the natural drying speed of the wood.

After all, when drying wood by hot-drying method, it is necessary to understand the properties of wood and apply the appropriate drying method. Hardwoods are more difficult to dry than conifers, and different species require different drying conditions.

In particular, if the dry hot air circulates around the wood during drying, the surface of the wood dries rapidly and the difference in the drying speed of the wood increases, causing the outside of the wood to shrink, while the inside of the wood does not shrink, causing high drying stress. If the level of this dry stress exceeds the inherent mechanical strength of the wood, it has a closed end where the deformation of the wood occurs.

Therefore, the present invention was devised to solve the above problems, the present invention is to put the wood into the drying furnace to dry while injecting steam while injecting steam so that the drying of the inside and outside of the wood is almost the same. Maintain the same internal and external temperature of the wood in the range of 60 ~ 130 ℃ and humidity of 99% or more, block the inflow of steam when the moisture content of the wood is less than 12% and air inside the drying furnace It is an object of the present invention to provide a wood drying method of a combination of steam steam and microwave method comprising the step of drying the wood while exhausting.

As described above, the present invention minimizes the temperature difference between the inside and outside of the wood in the drying furnace and the moisture content by minimizing the temperature difference between the inside and outside of the wood in the drying furnace. This has the effect of minimizing the occurrence of splitting during wood drying. In addition, the present invention is a very useful invention that can suppress the loss of heat inside the wood quickly heated by microwaves to the outside.

Hereinafter, the present invention for achieving the above objects and effects in more detail.

The present invention is a step of injecting steam while injecting a microwave into the drying furnace so that the drying of the inside and outside of the wood is almost the same while maintaining the inside and outside moisture content of the wood the same, Maintaining the same internal and external temperature of the wood in the range of 60 ~ 130 ℃ and maintaining the humidity inside the drying furnace of 99% or more, when the moisture content of the wood to be dried is less than 12% inflow of steam Blocking and drying the wood while exhausting the air inside the drying step.

At this time, the internal and external temperature of the wood to be dried is most preferably in the range of 60 ~ 130 ℃, if the temperature is less than 60 ℃ difficult to dry due to too low temperature, if the temperature is 130 ℃ or more of the wood is dried carbonized This is because of poor quality. Of course, the humidity inside the drying furnace is more saturated.

As described above, the present invention is classified into the early stages of drying and the late stages of drying wood. In the early stages of drying, it is important to put wood in a drying furnace to maintain equilibrium moisture content and temperature inside and outside the wood. (蒸氣) Put the inside and outside temperature of wood to be dried in the range of 60 ~ 130 ℃ and keep the humidity above 99%.

In the later stage of drying, the water content of the wood is kept at the same time as the water content of the wood is kept below 12% while the water content of the wood is kept less than 12%. This evaporates and the drying of the wood is completed.

As described above, the present invention has been described by means of a limited embodiment, but the present invention is not limited thereto and will be described below by the person skilled in the art and the technical spirit of the present invention. Various modifications and variations are possible within the scope of the claims.

Claims

Injecting steam while injecting microwaves into the drying furnace so that the inside and outside of the wood is almost the same while maintaining the inside and outside moisture content of the wood, and the inside and outside temperatures of the wood to be dried are 60 Maintaining the same in the range of ~ 130 ℃ and maintaining the humidity inside the drying furnace of more than 99%, and when the moisture content of the wood to be dried is less than 12% to block the inflow of steam and air in the drying furnace Wood drying method of the steam steam and microwave method characterized in that the wood drying step while exhausting.