What are the effects of moisture content of wood on drying

The service life of wood products is closely related to the moisture content of wood. Therefore, appropriate drying measures must be taken before wood processing to reduce the moisture in wood to a certain extent. What are the effects of moisture content of wood on drying?

1. The moisture content of different green wood is different

The moisture content of green wood of different varieties is different, and even for the same tree species, the moisture content of green wood in different parts is also different, which makes the drying characteristics of each piece of wood quite different.

2. The change of water movement has an impact on wood properties

Wood is a porous material composed of wood essence, moisture and voids. During the drying process, the composition changes physically and chemically, resulting in the corresponding change of wood structure.

3. Different moisture state in wood results in different drying energy consumption

There are mainly two forms of water in wood, free water and adsorbed water. The greater the force of the combination of adsorbed water and wood, the more heat energy required for water evaporation during drying.

In this case, the uneven moisture content will appear after wood drying, which requires the final humidity control treatment to eliminate the moisture content gradient in the wood after drying in time, so as to release the residual stress in the wood.

At present, most domestic wood processing enterprises do not have clear standards to standardize the operation of the final moisture control treatment of wood, resulting in unsatisfactory results. Therefore, in order to fundamentally solve the problem of wood drying, we must reform the wood drying process, and put forward the idea of graded wood drying. If the wood is to be dried in layers, the moisture content of the wood must be detected first. With the help of the detected mechanical device, the plates with different moisture content can be stacked and used in grades. The moisture content of the wood can also be calculated according to the weight of the plate to achieve grading.Then the wood moisture content classification technology is applied to the wood processing industry. The plates are dried, managed and used according to the moisture content. At the same time, it can also be monitored intelligently and adjust the drying benchmark in time according to the change of moisture content.

The graded drying of wood can not only ensure the quality of wood drying, but also improve the drying efficiency and achieve the effect of energy conservation and emission reduction. In addition to the process improvement, wood drying also needs an excellent drying equipment, which can not only ensure the drying quality, but also minimize the investment cost and drying cost.

High frequency drying machine is a good choice. High frequency drying is to make the molecules in wood run at high speed through dielectric heating, generate heat and heat quickly, and then quickly absorb water and dry through vacuum negative pressure, which is more stable, fast and of good quality.

Advantages of shuowei high frequency vacuum drying equipment

1. High stability

It can be vaporized at 50 ℃ and dried at low temperature, which greatly reduces the problems of wood cracking, deformation and discoloration, especially suitable for valuable wood sensitive to temperature.