JPS5829605A - Method of drying wood - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The conventional wood drying method is based on experience and involves adjusting the temperature, humidification, and stopping the humidity of the wood in anticipation of a sufficient percentage of wood to prevent cracking or deformation of the wood. Because the drying time was short and the drying cost was 1.
/'1/' and the loss of thermal energy was large.

It has been extremely difficult to efficiently dry shredded wood, as the drying rate varies significantly depending on the tree species, the hardness and softness of the material, the time of felling, etc.

The present invention aims to solve the above-mentioned problems,
Wood) 1! In the drying process VC, the coating layer water rate and the deep layer water rate are incorporated to achieve a safe moisture level of 1. The J++ value is set with a difference, and the water content of the surface layer and deep layer of the wood brought into the dry storage room is measured, and the measured water content varies up and down between the water content line above. It is characterized by increasing the temperature and humidity inside the room by 111 times.

The present invention will now be described in more detail.

O With the setting of the maximum total moisture slope value placed on the trolley, drying is performed by operating the drying guide trolley, arbor, and intake/exhaust damper. Measurement of the moisture content of the entire wood and the moisture content 11 fl 1 foot and the internal humidity,
Record indoor temperature.

In addition, in the drying process, the wood water ratio is approximately 50 to 6.
The first stage is when it reaches 0%, and the second stage is when it reaches 25%.
Assuming that the finishing drying process of the school during the first half of the first stage is stage A, in the first half of the first stage, the room temperature is rapidly raised, and the dehumidification is carried out by driving the dehumidifier and ventilation by opening the dampers. The sword will not crack or go awry, so you can quickly sharpen it.
Heat the wood once and let it rise.

Between the second half of the first stage and the first half of the second stage (when the moisture content is around 30%), and for the second half of the second stage and the third stage, To find out over time the range of intake with a moisture gradient of 1, which does not cause cracking or deformation of the wood, by carrying out experiments on wood at different temperatures and humidity levels.

If the situation is as shown in , add the total retention rate to the moisture content of the coating layer to set the lower limit a' of the moisture content of the six layers, and 1Tf.
For example, the average value thereof is set as the upper limit mc of the surface layer moisture content between the surface layer water content (a) and the deep layer water content (f'ic).

In addition, in the experimental example, the difference between the large water content a and the deep water content was 7% in the first stage, 5% in the second stage, and 3% or less in the third stage.

An example of the apparatus used for carrying out the present invention will be described below. Reference numeral 1 denotes a drying chamber consisting of a lower frame 1a and an upper frame 1b, a floor plate 2 is provided on the top of the lower frame 1a, and a
A base fan 3, a humidifying spray nozzle 4, an auxiliary sheathed heater 5, and a hot water fin heater 6 are provided,
A rail 7.7 is laid on the floor, and cut-out windows 8, 8 are provided on both sides of the rail for convection of heated air. The lower frame 1bVc of the chamber 1 is connected to the lower frame 1b, and the 41F air port 9b is connected to the lower frame 1a.

Reference numeral 10 denotes a heat exchange tank equipped with a heating coil 11.The heating coil 11 is used as a hot spring source in hot spring areas, or as a hot water power rI heating device V when there is an incinerator equipped with a hot water heater.
The hot water heated in the heat exchange tank 10 is sent to the hot water fin heater 6 through a pipe 12 having an electric three-way valve 12a, and the return pipe connects the discharge port with the heat exchange tank 10. The middle part of 13 is '-Double Sword P14
The pUg self-sword that is attached to the main 14, which shoulders the a, has been applied ten times to the wet sedge sedge nozzle 4.

15 is stacking wood on racks and loading it with #1 in drying room 1.
There is a frame 17 with a rail in front of the carriage 16, and a connecting rail 18 is installed thereon when loading and unloading the carriage 15.

Further, although not shown, a thermometer and a humidity gauge are provided inside the drying chamber 1, and the measured values are digitally displayed outside the drying chamber.

Furthermore, water rate detectors 19 and 20 are drilled into each piece of wood carried into the drying room 1 from the end of the wood to the depths of the wood, and these are connected to a control source device.

In addition, the rjil heat exchange tank 10 is a hot spring or an incinerator.
- When there is no boiler and the auxiliary sheathed heater 5 is used as the heat source. Input the water content into the automatic surface control device, and for the automatic surface control, the above-mentioned surface water content lower pulse a', ice layer rate upper limit gland C, and deep pigeon rate are determined in advance. Create and set the water rate program and turn on the main switch.
...and hot water (Aαα water pump 21'g/hour,
For the dehumidifier 9, the indoor temperature is within the range of the set temperature, and the temperature is 20 ~
If it is within 71°C, it will start IJf north, if it is outside the above range, it will stop, and if it is above the upper limit temperature, it will pull lJP air damper 22,
23 is opened, and the auxiliary sheathed heater 5 is used to rapidly raise the temperature when the indoor temperature reaches 21°C.Heating control thereafter is performed by controlling the indoor temperature using the hot water fin heater 6, for example, during the RIJ1 and RIJ1 periods. 2M upper jυ” is 5
Fully open the electric J-way valve 12a so that the temperature is 0 to 55 degrees Celsius, 40 to 45 degrees Celsius in the second half of the second period, and 65 to 70 degrees Celsius in the third period.
This is done by heating and automatically opening and closing the suction damper zz and 2z.

In addition, the indoor humidity is adjusted to the 1b1'' side by automatically opening and closing the stone sea bream 2-1)f+14a and spraying warm water from the humidifying spray nozzle 4, and by automatically opening and closing the suction air dampers 22 and 23. li] The IJ11J range is, for example, 73-80% in the first half, 70-75% in the second half, 60-65% in the second half, 70-75% in the first half of the third, and 50-75% in the second half.
It shall be 55%.

When wood is laid under automatic control in a poorly controlled drying environment as described above, as the room temperature and wood temperature rise, the evaporation of water from the wood coating surface is small, so evaporation progresses. Then, when the internal temperature drops to 1 degree, dehumidifier 9 also starts and stops? The '+Jki'R term boundary is maintained, and the Ikuhato Tomisui rate drops dramatically.

After drying has passed, the horizontal value of the surface water content meter 20 will be the upper limit of surface water content (for example, the average value of surface water content and deep water content, or When the lower limit a' of the mass layer corresponding to the upper and lower values) is reached, the dehumidifier 9 stops and dehumidification is no longer performed, so the moisture content of the clothing layer gradually increases due to water seeping from inside, and the water content meter 20 structure]l is a table [l
]1 When the moisture content reaches cK β, the dehumidifier 9 restarts and dehumidifies.

Such surface layer' water rate upper limit line C and coating layer lower limit prize water ¥-a
When intermittent dehumidification is repeated between The wood is completely dried through the drying steps of the second stage and the A stage.

As mentioned above, the present invention is based on the surface water rate line and depth in the timber laying process. - Add the maximum total moisture slope by 1, and measure the coating layer of the water system carried into the drying room and the water in the coating layer, and measure this. fc, the surface water rate fluctuates up and down in the darkness of the above 100% water rate.
Since the temperature and humidity are reduced to 1", the drying time can be shortened by performing the most rational drying within a range that does not cause cracks in the dried wood.

What's more, even in provinces that don't have much time for wood preparation, it is possible to dry it freely using automatic control.

[Brief explanation of drawings]

7- Figure 1 is a diagram of the drying process, Figure 2 is a diagram of the drying equipment, Figure 3 is a concave diagram of the same as above, and Figure 4 is a diagram of the wood to be dried. １．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．
... Bizou fan 6 ... Warm water fin heater 9 ... V, humidifier 10 ... - Hot water heat generator ap... Korotaka volume rate - b ... Chen j - Miyamizu rate Iwao a'... Six no words water rate lower limit ffMc...
...Fukanoso' water rate upper limit line 9- 4, , , , -1, 6Q @, ψ

Claims (1)

[Claims] (+) The surface moisture content line and the deep moisture content line in the wood drying process are set with a difference by a total moisture slope value,
We measure the water poverty rate in the next layer and deep layer of the wood that has been brought into dry water.
The temperature and humidity of the drying guide are controlled so that the measured water rate varies up and down between the four cliffs mentioned above +41
A method of drying wood that is timely. (2) The wood drying method according to claim 1, wherein the upper limit of the variation range of the moisture gradient value is set at an intermediate point between a set surface layer moisture content line, a deep layer moisture content, and a vein.