Wood Drying Benchmark
During the drying process of wood, in the process of water evaporation in wood, due to the different combinations of various water in wood and wood, the properties of water in wood at each stage are different, and the properties of wood corresponding to this are also different. Therefore, in the wood drying process, the evaporation process of water in the wood should be reasonably controlled, so as to improve the drying speed as much as possible on the premise of ensuring the drying quality of the wood.So how to reasonably control the water evaporation process? The usual practice is to control the intensity of water evaporation in the wood according to the nature, specification and moisture content of the wood. The drying benchmark is a program table compiled according to the change of drying time and wood state (moisture content, stress) to catch up with the change of medium temperature and humidity. During the test drive drying process, if this program table is correctly executed, the wood can be reasonably controlled. The drying process, so as to ensure the drying quality of wood.
Types of Drying Standards
According to the control factors of the drying process, the drying standard is usually divided into a time drying standard and a moisture content drying standard.
Time drying benchmark: control the drying process according to the drying time, formulate the size of the medium parameters, that is, divide the time required for the drying process into several time stages, specify the weight of each time stage, and stipulate the corresponding time stage according to each time stage. media temperature and humidity.
The time-dried drying benchmark is an empirical drying benchmark summed up on the basis of long-term use of moisture content. As long as the operator has a good understanding of the equipment used and the properties of the wood to be dried, and controls the drying process according to the drying time, qualified boards can be dried.
Moisture content drying benchmark: control the drying process according to the moisture content of the wood, formulate the size of the medium parameters, that is, divide the entire drying process into several stages according to the range of the moisture content, and specify the corresponding medium temperature and humidity according to the stage. The range of water content reduction in each stage is consistent, such as from 35% to 30%; from 30% to 25% and so on.
Dividing the entire drying process into 2 or 3 moisture content stages is called a two-stage or three-stage drying benchmark.
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