JPH0638024B2 - How to dry wood - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for drying timber lumbered into a predetermined shape, and in particular, an improvement in a method for forcibly drying timber by stacking and drying the timber through a splint. Regarding

[Conventional technology and its problems]

Conventionally, in order to process and use wood, it is dried outdoors under natural conditions by a so-called natural drying method,
A method of leaving and drying for a long period of months or years, and for example, artificial drying in which a drying facility equipped with a wood drying chamber is used to send air at room temperature or heated to force dry in a relatively short period of time. It has been dried by any of the methods. Which of these drying methods is used depends on the type of wood to be dried, the shape of the lumber,
Alternatively, it is selectively determined according to the purpose of use thereof.

However, regardless of whether it is a natural drying method or an artificial drying method, in order to improve air permeability and enhance drying efficiency, for example, a 15 to 25 mm square bar-shaped pier is inserted between the timbers that are stacked and dried. It However, the surface of the wood that comes into contact with the pier is strongly crimped and the air permeability of the surface is highly impaired, so the surface that is in contact with the pier and the other non-contact exposed surface will not dry. The inconvenient phenomenon that a significantly different color tone state is formed on the surface of the treated wood is unavoidable. Such a color tone pattern of the dry wood surface has different shades such as the felling time of the tree, the lumber processing time, the type of wood, the water content, or the coloring due to mold, and the shade and the coloring depth are different, for example, Even if the surface is shaved and finished with a planer, the color tone pattern still remains, which not only markedly reduces the commercial value of wood, but is actually restricted by applications. The color pattern based on this pier is contained in the wood especially when the wood itself has a high water content or when the humidity is high. For example, strong discoloration is observed due to tannin, lignin resin, etc., and sometimes reaches a depth of, for example, 5 to 10 mm from the wood surface.

Such a dry wood color pattern is unavoidable in the conventional drying method, and as described above, its use is restricted and the commercial value is significantly reduced. The development of a drying method that does not allow it has been a major issue in the wood industry.

Accordingly, it is an object of the present invention to provide a method for drying wood that does not substantially form such a shaving pattern. Another object of the present invention is to industrially provide a high-grade wood processed material without a wood pattern.

[Means for solving problems]

The present inventor has found many practically desirable drying methods for wood as a result of many experimental studies using a closed type wood drying apparatus for a method for effectively achieving the above object.

That is, according to the present invention, a plurality of substantially parallel ridges and valleys intersecting the length direction are formed on at least the upper surface and the lower surface of the square bar between the processing lumber that has been cut into a predetermined shape, and each convex The present invention provides a method for drying wood, characterized by drying by interposing a pier having a width of the surface of the strip of 5 mm or less, preferably 3 mm or less. The wood used in the method for drying wood of the present invention is a spacer in the shape of a square rod arranged between the woods for drying stacked on top of each other. It is characteristic that a large number of concavo-convex stripes intersecting the length direction, preferably intersecting at right angles are formed over the entire length. It is important that the ridges are formed substantially parallel to each other, and that the upper surface of each ridge has a width of 5 mm or less, preferably 3 mm or less. The narrower the width of the upper surface of the ridge is, the more effective it is to prevent the formation of color patterns by the pier, but considering the strength as a spacer, the width can be selected as appropriate in relation to the material and strength of the pier. It is formed. As described above, if the width of the upper surface of the ridge is too wide, the color tone pattern of the contact portion is easily formed on the surface of the dried wood, which is inconvenient. Further, the grooves (grooves) may be formed at any intervals and depths as long as they can stably hold the stacked timber, and the ridges are formed so that their cross sections are spaced. Although they may be formed in parallel rectangular shapes, the cross-sectional shape may be formed into a trapezoidal shape or another shape in consideration of the strength of the ridge and the air permeability of the groove.

Such a pier is usually formed on each of the upper and lower surfaces of a square bar-shaped wood.
It can be formed by forming a transverse groove type concave groove that is orthogonal to the length direction over the entire length direction, for example, on both upper and lower surfaces of a hollow square tubular body made of metal aluminum, similar to penetrating the hollow portion. The lateral groove type through-holes formed at a predetermined interval provide a practical pier with excellent air permeability and thermal conductivity, and good drying efficiency. In addition, in the prismatic pier, a transverse groove type concave groove intersecting with the shaft is further formed with a concave groove parallel to the shaft.
In the so-called vertical and horizontal cross-shaped grooved tree, exhaust drying efficiency is further enhanced.

The method of the present invention is technically characterized in that the above-mentioned specially-shaped splint is inserted between woods and dried, but particularly, it is extremely effective and effective for dry lumber by a forced drying method using a wood dryer. Such an improved invention is epoch-making in the wood utilization industry and is industrially extremely useful with excellent practicality.

[Action / effect]

According to the method of the present invention, in both the natural drying method and the forced drying method, the color tone pattern due to the sprue is not substantially formed on the surface of the dried wood, and the usage is not restricted. As the high-quality natural wood is effectively provided, its industrial value is extremely high.

〔Example〕

Next, the method of the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 is a partial perspective view of an example of a pier used in the method of the present invention, and FIG. 2 is a cross-sectional view showing a state in which the pier is inserted between stacked timbers for drying. Moreover, FIG.
It is a schematic diagram for demonstrating the situation which implements the method of this invention using a wood dryer.

In FIGS. 1 and 2, a large number of parallel concave lines 2 cut in a direction orthogonal to the lengthwise direction are formed on the upper and lower corresponding surfaces of the wooden bar 1 having a rectangular bar shape over the entire length of the bar, respectively. Are formed, and thereby a large number of convex stripes 3 are formed. The upper surface 4 of the ridge of the pier that functions as a spacer is
It is a bearing surface that is formed with a width of 2 to 3 mm and holds the stacked drying woods 5 vertically apart from each other, and is excellent in that it does not form a jetty color pattern on the dry wood surface. It is to provide a pier.

The wood dryer schematically illustrated in FIG. 3 has a structure in which the circulating air can be quickly adjusted to a predetermined value, and the circulating air is discharged from the vicinity of the floor of the dryer. is there. The wall 11 of the dryer 10 uses a heat insulating material and is kept warm so that the humidity inside the dryer does not condense due to a low outside temperature. Further, a heat-resistant and moisture-resistant electric motor 12 and a fan 13 connected to the electric motor 12 are attached to the upper part of the machine. Further, in the vicinity thereof, a steam heater 14 for heating the air circulated in the direction shown by the arrow
Temperature sensor installed at the right place in the aircraft
The heater 15 is configured to detect the difference from the set predetermined temperature and automatically operate the heater 14 to effectively control the temperature. Therefore, while the air kept at the set temperature circulates inside the machine at all times, timbers stacked on top of the bogie (giving a gap between the timbers to facilitate understanding, not shown) Is heated to gradually evaporate the contained water, and the drying is efficiently performed. Also, a humidity sensor (not shown) for detecting the humidity in the circulating air is attached to the inside of the machine, and when the humidity of the circulating air exceeds a set value, it is detected and provided at the bottom of the machine. Highly humid air is appropriately discharged from the exhaust duct 16 to the outside of the machine.

For drying wood, it is usually desirable to start blowing air at a relatively low temperature at first and gradually raise the temperature, and finally dry the wood with, for example, warm air at about 40 ° C. Raw wood generally contains 50-70% or more water,
This can be efficiently dried to 10% or less, for example, about 7 to 8%.

According to the method of the present invention using a specific shape of the pier, on the surface of the dried wood, without forming a pier mark,
Very high quality dry wood can be easily obtained.

[Brief description of drawings]

FIG. 1 is a partial perspective view of an example of a pier used in the method of the present invention, FIG. 2 is a sectional view showing a state in which the pier is inserted between stacked timbers for drying, and FIG. It is a schematic diagram for demonstrating the situation which implements the method of this invention using a wood dryer. Reference numerals in the figure: 1 ... wood, 11 ... wall 2 ... concave, 12 ... electric motor 3 ... convex, 13 ... fan 4 ... convex upper surface, 14 ... steam heater 5 …… Wood, 15 …… Temperature sensor 10 …… Dryer, 16 …… Exhaust duct

Claims (2)

[Claims] 1. A plurality of substantially parallel ridges and ridges intersecting the lengthwise direction are formed on at least an upper surface and a lower surface of a square bar between lumbers for processing which are cut into a predetermined shape, and each ridge thereof is formed. A method for drying wood, characterized in that the wood is dried by interposing a splint having a surface width of 5 mm or less, preferably 3 mm or less. 2. The method for drying wood according to claim 1, wherein a hollow wooden aluminum splint is used as the square bar.