The purpose of cooking is to soften the wood and increase the plasticity and moisture content of the wood to reduce the cutting resistance during cutting.
And remove some of the oil in the wood and extracts such as tannin.
Generally, the cooking of the prescription is boiled. The cooking temperature and time should be controlled according to the hardness of the tree species and the wood, and the thickness of the sliced ​​wood. The temperature is higher when the hardness is high, and the cooking time is longer when the thickness is thicker.
Pay attention to the following points when cooking wood:
1 When the square is placed in the cooking pool, the ice temperature should preferably be kept at room temperature, so as to prevent the surgeon from suddenly cracking due to thermal expansion.
2 The opening temperature is 10-15 degrees Celsius/hour. If the temperature rises too fast, it will cause thermal stress in the wood, which will cause the wood to crack. When the temperature rises above 40 °C, the temperature should be slowed down.
3 Wood cooking should be carried out according to the tree species and diameter.
4 Excessive cooking will reduce the quality of the thin wood.
5 It is necessary to remove the oil, bark and muddy water in the cooking pool in time to avoid polluting the wood.
3 The cooked wood should be transferred to the warm water storage tank in front of the planer for cutting. The optimum temperature for cutting is 50.
~60 degrees, too high temperature will deform the planer, resulting in uneven thickness of the thin wood, or the surface of the thin wood.
The following is an example of the cooking process of a wood section of a factory:
Ash: The water temperature rises from 15 °C to 50 °C, heats for 4 h, then heats up from 50 °C to 90 °C, the heating rate is guaranteed to be 2 ~ 3 degrees / hour, and then kept for 10 h.
Yellow Polo: The water temperature rises from 15 ° C to 70 ° C, and the heating rate is 4 to 5 ° C / h. Then, the water is naturally cooled and soaked for 24 hours.
Elm: The water temperature rises from 15 °C to 80 °C, and the heating rate is 4-5 °C/h. Then, the water is naturally cooled and soaked for 24 hours.
Elm: The water temperature rises from 15 degrees to 50 degrees, and the temperature is kept for 4 hours. The water temperature is further increased to 100C, and the heating rate is 2~.
3 degrees / h, heat 15 ~ 20h, then, the water is naturally cooled.
The following is an example of the three-stage cooking process of the ash wood section of a factory in the north:
winter:
1 After the wood is thrown into the pool, it is covered, drained, soaked for 6-8 hours, and the water temperature is maintained at 38-39 °C.
2 The first temperature is raised to 50-55 ° C, this time is 16 hours, and the heating rate is 0.5 ° C / hour.
3 Closed steam insulation for 16 to 18 hours to balance the temperature inside and outside the wood section.
4 The wood section is heated to 75-80 degrees for the second time. This period is 18 hours and the heating rate is 1 degree/hour.
5 Closed air insulation for 2 to 4 hours to balance the temperature inside and outside the wood section.
summer:
(The wood section is soaked for 4 to 6 hours after the pool is thrown. If it is rainy season, the time can be shortened.
2 The first temperature is raised to 50 to 55 degrees, and the heating rate is controlled at 1 ° C / hour.
3 The following steps are the same as above.
After the actual measurement, according to the above procedures, the temperature of the wood core can reach more than 45 degrees.
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