Drying and gas or vapor contact with solids – Process – With nondrying treating of material
Patent
1997-10-09
1999-05-04
Bennett, Henry
Drying and gas or vapor contact with solids
Process
With nondrying treating of material
34417, 34477, 34494, 34497, F26B 700
Patent
active
058990046
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a seasoning method for wood used as a building material of a structure or a component material of fittings.
2. Description of the Prior Art
The conventional wood seasoning method is roughly divided into natural seasoning and artificial seasoning. Artificial seasoning includes a seasoning method using a heat source of gas, electricity, or steam, a reduced-pressure seasoning method using heating or high frequency, and a dehumidification seasoning method.
Because natural seasoning is a method of putting green wood at a well-ventilated place to naturally season the wood, it requires a lot of seasoning days and has a disadvantage that the number of seasoning days cannot be determined because it is subject to weather. Moreover, the wood becomes heterogeneous because its moisture content cannot be kept constant and moreover, the wood cannot be seasoned up to a certain moisture content or less. Therefore, wood used is dried due to air conditioning in a room after built and resultingly, structures or fittings are deformed.
In the case of artificial seasoning, it is possible to decrease the number of seasoning days, specify the number of seasoning days, and obtain wood with a low moisture content, and comparatively small warps, cracks or deformation because this method is not influenced by weather. However, the costs for a heat source and equipment increase.
In the case of seasoning using gas or electricity as a heat source or using steam, temperature and humidity can easily be adjusted. However, the equipment cost and energy cost increase and problems lie in the durability of equipment including a furnace and machinery.
Reduced-pressure seasoning is performed by reducing pressure and thereby lowering the boiling point of water (approx. 41.degree. C.). When the seasoning temperature exceeds 80.degree. C., wood fiber is swelled and broken. In other words, strength deterioration occurs. In the case of this method, when the wood temperature lowers due to sudden seasoning, the seasoning speed decreases. Therefore, an effective seasoning time is up to approx. 2 hours. Moreover, because wood temperature unevenness occurs in stacked wood when the wood temperature rises and thereby, unevenness of moisture content occurs in finished wood.
In the case of dehumidification seasoning, equipment is simple and its operation is also easy. However, seasoning time increases.
BRIEF SUMMARY OF THE INVENTION
The present invention uses industrial wastes such as sawdust, planer chips, wood chips, scrapped wood, and wood pieces as combustion materials and incompletely burn them to perform low-temperature smoking-seasoning. Therefore, it is possible to decrease the energy cost by using wastes and manufacture the wood having a small occurrence rate of warps or cracks, mildewproof property, insectproof effect, and high rotproof effect.
This is because aldehyde contained in smoke combines with lignin contained in wood together with cellulose to coagulate lignin, and the cellulose density of the core of the wood is higher than that of the surface of the wood and therefore the core temperature becomes higher than the surface temperature, seasoning unevenness between inside and outside of the wood is eliminated, and resultingly the number of warps or cracks decreases. Moreover, phenolic acid which is one of the components in smoke and serves as a material for naphthalene shows the mildewproof property and insectproof effect and aldehyde shows the rotproof effect. Furthermore, organic substances in smoke increases the strength of cellulose which is also referred to as the backbone of wood, makes grain beautiful, and makes the movement of a plane or saw smooth.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic view showing a general structure; and
FIG. 2 is a top view of a furnace.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
In the case of a system used for the present invention, a furnace is set to the floor section in a fire-resistant room
REFERENCES:
patent: 1413018 (1922-04-01), Fujino
patent: 4182048 (1980-01-01), Wolfe et al.
patent: 4486475 (1984-12-01), Shutov et al.
patent: 5293700 (1994-03-01), Ishii
Niiyama Shin
Sugaoka Hitoshi
Sugaoka Kenji
Sugaoka Taku
Bennett Henry
Gravini Steve
Kodaijin Sugaoka Ltd.
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