JP2010083096A - Wood treating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wood treating method which can shorten a treating period of natural seasoning for obtaining a required drying state. <P>SOLUTION: In the a wood treating method, a pond P for immersing woods L in the state of a log in water after logging trees and a place for performing natural seasoning are previously prepared near a logging area, the woods L are immersed in water for a prescribed period, and some of them are suitably lifted on the ground based on an order-receiving situation and subjected to a natural seasoning for a prescribed period on the ground. In the next logging period, when there are woods L logged in the previous year and still left in water, only a required number of woods are logged without unnecessary logging in consideration of the situation. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wood treatment method by a natural drying method.

  When wood is used in a building or the like in a state where drying is insufficient, there is a high possibility that the wood will be deformed or contracted over time. Therefore, it is common to dry the wood sufficiently before it is sawn to a predetermined size. Conventionally, as a method of wood treatment to sufficiently dry wood, an artificial drying method that dries in a short period of time by heating with hot air, steam, far infrared rays, high frequency, smoke, etc. in a building equipped with drying equipment ( For example, Patent Document 1) and a natural drying method (for example, Patent Document 2) that is left outdoors for a long period of time are performed. The natural drying method has advantages such as no need for drying equipment and fuel as in the artificial drying method, and good quality of the wood after drying.

Japanese Patent Laid-Open No. 11-237179 JP 2004-25822 A

  However, the wood treatment method by the natural drying method has a disadvantage that it is inferior in productivity because it takes a long time to reach the required dry state, and in many cases, the wood treatment method by the artificial drying method Tend to be adopted.

  This invention is made | formed in view of the reason which concerns, The objective is to provide the wood processing method which can shorten the processing period of the natural drying used as a required dry state.

  In order to achieve the above object, the wood treatment method according to claim 1 is characterized in that logs in a state of logging are immersed in water for a predetermined period and then naturally dried on the ground for a predetermined period. .

  The wood treatment method according to claim 2 is characterized in that, in the wood treatment method according to claim 1, the total of the period of dipping the wood in water and the period of natural drying on the ground is within one year at most. And

  The wood treatment method according to claim 3 is the wood treatment method according to claim 1 or 2, wherein a pond for immersing the wood in water for a predetermined period and a place for natural drying are preliminarily located near the felling land. It is characterized by having prepared.

  The wood treatment method according to claim 4 is characterized in that in the wood treatment method according to any one of claims 1 to 3, heat treatment is performed before natural drying on the ground.

  According to the wood treatment method of the present invention, wood is soaked in water for a predetermined period, and then naturally dried on the ground for a predetermined period, so that the natural drying treatment period for obtaining a required dry state can be shortened. .

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view showing a state in which wood L is immersed in water in the wood treatment method according to the first embodiment of the present invention. Trees such as Japanese cedar, Japanese cypress, and Japanese red pine are cut down at an appropriate time (for example, before winter), and the cut logs are placed in a pond P, which is a stockpile of stored water. Immerse in water for a predetermined period (for example, about 2 to 5 months). In this case, the wood L is in a state of floating on the water surface or sinking to the bottom of the water. After a predetermined period of time has passed in this state, the wood L is left on the ground by laying or the like and naturally dried for a predetermined period.

FIG. 2 is a bar graph showing the results of an experiment in which the weight increase was measured when 338 cedar wood L in the state of a skinned log was immersed in water in the pond P for 4 months. The horizontal axis represents the weight change rate (%), which can be obtained by the following calculation formula.
Weight change rate = (weight after water treatment-weight after felling) ÷ weight after felling x 100
The vertical axis represents the number of items corresponding to the weight change rate. As can be seen from FIG. 2, the weight change rate is distributed around 16%, and a considerable amount of water is absorbed.

  FIG. 3 (a) shows the results of an experiment in which cedar wood L was immersed in water in an aquarium for 110 days from October and then naturally dried on the ground for 187 days. In FIG. 3A, the horizontal axis is the number of days since the wood L is immersed in water, and the vertical axis is the rate of change (%) in the weight of the wood L. In addition, after the state where the wood L is immersed in water is over, a preparation period is sandwiched between the start of natural drying. In the figure, the data A is for a log with a skin end of 20 cm and a length of 70 cm, and the data of B is for a log with a skin end of 20 cm and a length of 70 cm. During the period in which the wood L is immersed in water, the weight of the wood L increases, and finally the weight increase rate of any wood L exceeds 16%. In the natural drying period on the ground, moisture is lost and the weight of the wood L decreases.

  FIG.3 (b) calculates the moisture content (%) of the timber L from the data of the natural drying period in Fig.3 (a). The moisture content is 20% or less for any wood L by the end of the natural drying period. In normal natural drying, that is, natural drying performed without immersing the wood L in water for a predetermined period of time, it takes one year or more to achieve this moisture content. This is because the heartwood part of the wood L that is not soaked in water has a large amount of sap remaining as water, but the water is soaked into the heartwood part and the sap oozes out from the heartwood part through a state of soaking in water. As a result, it is considered that the wood L is easily dried. The inventor of the present application confirmed that the sap actually oozed out.

  In this way, when the wood L is immersed in water for a predetermined period and then naturally dried on the ground for a predetermined period, the natural drying process period for obtaining a required dry state can be shortened, and the process period is shorter than one year. can do. Also, if the total period of soaking wood in water and naturally drying on the ground is within one year at most, a lot of wood L will be stored in the water after logging and some of them will be appropriately selected based on the order status. If the remaining timber L from the previous year is in the water at the next logging time, consider that, and cut only the necessary number so as not to cut wastefully. It becomes possible. The period of immersing the wood in water is 110 days in the experiment of FIG. 3 (a), but it is considered that it should be at least about two months since fresh water is sufficiently infiltrated into the heartwood part. Moreover, even if the period during which the wood L is immersed in water is prolonged, the natural drying period and the quality of the wood L are not affected.

  It is desirable that a pond P for immersing the wood L in water for a predetermined period and a place for natural drying are prepared in advance near the felling land. By doing so, it is not necessary to transport the undried wood L to a building provided with a drying facility as in the case of the wood treatment method by the artificial drying method, and the necessary amount of the wood L that has been naturally dried is required. You just need to carry it out.

  Next, a wood processing method according to the second embodiment of the present invention will be described. In addition to the first embodiment of the present invention, this wood treatment method performs heat treatment after immersing wood in water for a predetermined period and before natural drying on the ground for a predetermined period. In this heat treatment, the lignin contained in the wood L is softened by heating the wood L to a lignin softening temperature (eg, about 80 ° C.) for a short time (eg, about 10 to 24 hours), and the lignin is cracked after sawing. This is to prevent the wood L from being cracked or warped.

  Since the heat treatment apparatus used here heats for a short time unlike an artificial drying apparatus, it may be simple and can be easily provided near the felling land. For example, a 40-foot container serving as a heat treatment chamber is carried by a large truck, an incinerator is provided near the container, and a heat transfer duct is provided between the heat treatment chamber and the incinerator. As a heating method, hot air, steam, smoke or the like may be used. The fuel cost is not much, and you can use wood bark and chips as fuel.

  The wood processing method according to the embodiment of the present invention has been described above, but the present invention is not limited to the one described in the embodiment, and various design changes within the scope of the matters described in the claims. Is possible. For example, wood soaked in water is often a log with a skin, but can also be a log without a skin.

It is the schematic which shows the state in which the timber in the wood processing method which concerns on embodiment of this invention is immersed in water. It is one experimental result figure of the wood processing method same as the above. It is another experiment result figure of the wood processing method same as the above.

Explanation of symbols

L Wood P Pond

Claims (4)

  A wood treatment method characterized by dipping a log-like wood from which a tree has been cut into water for a predetermined period, and then naturally drying it on the ground for a predetermined period. In the wood processing method of Claim 1,
A method for treating wood, characterized in that a total period of soaking wood in water and naturally drying on the ground is within one year at most. In the wood processing method of Claim 1 or 2,
A wood processing method characterized by preparing a pond for immersing wood in water for a predetermined period and a place for natural drying in the vicinity of a felling site. In the wood processing method in any one of Claims 1 thru | or 3,
A wood treatment method, wherein heat treatment is performed before natural drying on the ground.

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