JPH09295303A - Consolidation of wood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with an expensive pressure container and thereby obtain an advantage in terms of facilities by charging compressed wood into a sleeve with an airtightly sealed structure under a hermetically closed state, and charging the sleeve into a heat medium oil tank at an ordinary pressure to thermally fix the wood. SOLUTION: First, wood 1 which is softened by vapor processing and mechanically compressed under pressure is charged into a sleeve 2, then a cap 4 is screwed into a mouthpiece 3 fixed to the open end part of the sleeve 2 to hermetically seal the open end part. Next, the sleeve 2 is charged into a heat medium oil tank to thermally fix the compressed wood 1. To thermally fix the wood 1, it requires the presence of more than a specified amount of moisture. However, the wood 1 charged under a hermetically closed state contains adequate moisture for thermal fixing because it is processed with vapor in the softening step. Consequently, the conventional vapor processing at a high temperature and under a high pressure is no longer required and also a costly pressure container is unnecessary. In addition, a heat medium need not be replaced when the single round of thermal fixing is ended, while the heat medium has to be replaced when the conventional processing method is used. Besides, this new processing method is advantageous in terms of productivity and energy efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for consolidating timber for effective utilization of thinned wood and the like removed during the growth process of, for example, cedar and cypress.

[0002]

2. Description of the Related Art At present, the technique of consolidating wood has reached the stage of practical use, and various methods of consolidation have been tried.

The purpose of compaction of wood is to make wood wood denser, thereby increasing the mechanical strength and hardness of the wood so as to raise the quality of wood, and the molding process is easier than conventional cutting processes. It is intended to increase the utility value of wood by improving productivity, etc., and in particular, it is expected to effectively use thinned wood and the like that are removed during the growth process of cedar and cypress.

Although there are several methods for consolidating wood, typical process flows of a die pressing system and a pressing press working system are shown in FIGS. 3 and 4.

[0005]

By the way, according to the above-described method for consolidating wood, in any of the methods, high-temperature and high-pressure steam treatment is required to heat-fix the wood compressed under pressure. Therefore, the processing tank requires a pressure vessel capable of high-temperature and high-pressure processing, which is disadvantageous in that the equipment cost is high, and requires steps such as temperature rising-heat fixing-deaeration-cooling. There are many numbers, and moreover, once the heat fixing is completed, it is necessary to replace all the steam in the processing tank, and there are many disadvantages in terms of productivity and energy efficiency, which is not practical.

Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide a method for consolidating wood, which is advantageous in terms of equipment cost, productivity, energy efficiency and the like and which is excellent in practicality. To do.

[0007]

In order to achieve the above-mentioned object, the present invention relates to a method for consolidating wood, in which a compressed wood is loaded into a sheath tube having an airtight sealing structure and hermetically sealed. After that, the pods are put into a heating means under normal pressure, and the wood is heated through the pods by the heating means under normal pressure to heat-fix the wood.

According to the present invention, since compressed wood can be heat-set under normal pressure, an expensive pressure vessel is not required, which is advantageous in terms of equipment and the number of steps can be reduced. Moreover, the heat medium can be effectively used, which is advantageous in terms of productivity and energy efficiency.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A method for consolidating wood according to the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1 and FIG. 2, 1 is wood such as thinned wood to be consolidated, and 2 is made of high heat conductive iron or stainless steel, and has a length dimension larger than that of the wood 1. An inner airtightness is ensured by fixing a mouthpiece 3 to an opening end portion of a sheath tube formed in a bottom cylindrical shape and screwing a cap 4 on the mouthpiece 3. Reference numeral 5 is a heat transfer oil tank composed of an open tank at an atmospheric pressure with an open upper part. The heat transfer oil oil 6 heated to a predetermined temperature is filled in the heat transfer oil oil tank 5. The pod tube feeding area of the conveyor 7 to be transported to is immersed. Reference numeral 8 denotes a heat medium oil control unit attached to the heat medium oil tank 5, which is for controlling the temperature of the heat medium oil 6 in the heat medium oil tank 5 to a constant temperature. 6 is circulated through a circulation pipe 10 by a circulation pump 9, and the heating medium oil 6 is heated to a predetermined temperature by a heater 11 on the way. Reference numeral 12 denotes a plurality of cooling liquid showers arranged on the downstream side (on the right side in FIG. 2) of the heat medium oil tank 5 of the conveyor 7 and above the sheath cooling area.
A cooling liquid such as water is exposed to the.

Next, the method for consolidating wood according to the present invention will be described.

First, as shown in FIG. 1, a compressed wood 1 is hermetically loaded into a pod 2. That is, wood 1 softened by steam treatment and mechanically compressed under pressure is loaded into a pod tube 2, and a cap 4 is screwed to a mouthpiece 3 fixed to the open end of the pod tube 2 to remove the pod tube 2. Seal the open end. By the way, as a method for loading the pressure-compressed wood 1 into the pod tube 2, the wood softened by steam treatment of the press-pressing method is pressed into the pod tube 2 by a cylinder and loaded (pressurized compression). The method is suitable for application of the present invention. However, a method of cooling the wood 1 pressed (pressurized and pressed) by the mold pressing method and temporarily fixing the shape and loading the wood 1 into the sheath tube 2 is also possible.

Next, as shown in FIG. 2, the sheath tube 2 is put into the heating medium oil tank 5 to heat-fix the compressed wood 1. That is, the pods 2 in which the compressed wood 1 is hermetically loaded are sequentially supplied to the pod pipe supply area on the upstream side (left side in the figure) of the heat medium oil tank 5 of the conveyor 7, and the conveyor 7
The pods 2 are sequentially charged into the heating medium oil tank 5 by the heating method, and the wood 1 is heated by the heating medium oil 5 in the heating medium oil tank 5 through the pods 2 to perform heat fixation. Incidentally, in order to heat-fix, it is necessary for the wood 1 to have a certain amount of water or more, but the wood 1 hermetically loaded in the sheath tube 2 is required.
Since the steam treatment is performed in the softening process, the moisture for heat fixation is sufficient.

After this, the sheath tube 2 is conveyed to the sheath tube cooling area of the conveyor 7, where the coolant shower 12 is applied to the sheath tube 2.
After cooling the wood 1 that has been subjected to the heat-setting treatment through the pods 2 by using the cooling liquid, the pods 1 are taken out from the conveyor 7, and the heat-treated wood 1 is taken out from the pods 2 Complete the consolidation.

The above is a description of one embodiment of the present invention, and the present invention is not limited to this. For example, the shape of the heat medium oil tank 5 and the method of charging the tube 2 are not limited, and the shape of the tube 2 and the structure of the airtight seal are not particularly limited.

[0016]

As described above, according to the present invention,
Since the compressed wood is hermetically loaded into a pod with an airtight seal structure and placed in a heat transfer oil tank at normal pressure for heat fixation, the conventional high temperature and high pressure steam treatment is unnecessary. . Therefore, an expensive pressure vessel is not required, which is advantageous in terms of equipment. In addition, it is not necessary to replace the heat medium after heat fixing once as in the conventional case, which is advantageous in terms of productivity and energy efficiency and is excellent in practicality.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which wood is hermetically loaded into a pod.

FIG. 2 is a schematic view of an apparatus for performing heat setting in the method for consolidating wood according to the present invention.

FIG. 3 is a flowchart showing a processing process of a conventional wood consolidation method using a die pressing method.

FIG. 4 is a flowchart showing a processing process of a conventional wood consolidation method using an indentation press working method.

[Explanation of symbols]

 1 Wood 2 Sheath Tube 5 Heat Transfer Oil Tank 6 Heat Transfer Oil 7 Transfer Conveyor 8 Heat Transfer Oil Control Unit 12 Coolant Shower

Claims (2)

[Claims] 1. A method for consolidating wood, which comprises softening wood by steam treatment, mechanically compressing it, and then heating it again to heat-set it. After loading the pod into a pod and sealing the pod, the pod is put into a heating means at atmospheric pressure, and the heating means at atmospheric pressure heats the wood through the pod to heat-fix it. A method for consolidation of wood, characterized by. 2. A sheathed tube which is loaded with compressed wood and sealed is put into a heating medium oil tank consisting of an open tank under normal pressure by a conveyor and heated to a predetermined temperature in this heating medium oil tank. The method for consolidating wood according to claim 1, wherein the wood is heated and fixed by heat with a heat transfer oil through a pod.