Little knowledge of wood drying (2)

The wood is dry, the better it is, the better?

When the wood is placed in a certain environment, the moisture content will tend to an equilibrium value after a sufficient period of time, called the equilibrium moisture content (EMC) of the environment. When the moisture content of the wood is higher than the equilibrium moisture content of the environment, the wood will shrink and contract, and vice versa. For example, the average annual equilibrium moisture content in Guangzhou is 15.1%, compared with 11.4% in Beijing. Drying to 11% of wood is suitable for Beijing, and it can be used in Guangzhou to absorb moisture and deform. Therefore, wood drying should be appropriate, not as dry as possible.

Is the imported equipment ok?

Since the reform and opening up, wood drying equipment from Germany, Italy, Singapore, Taiwan and other countries and regions have landed in mainland China, especially in economically developed coastal areas, which has greatly promoted the domestic wood drying market. It must be acknowledged that due to the advantages of the basic industry, certain components in imported drying equipment, such as high temperature motors, electric actuators and equipment, are manufactured at a higher level than domestic equipment. However, the industry of wood drying is narrower after all. The history of research in this area is also not long, and the attention paid is also insufficient. As a result, the overall level of equipment imported to China is not high and the quality is uneven. Especially the automatic control system often The function is simple and does not adapt to the domestic use environment, and the after-sales service can not keep up, there have been many examples that were eventually replaced by the domestic control system. At present, the overall level of domestic wood drying equipment is not low, and some have already been exported. Considering factors such as performance, price and service, there is no advantage in importing equipment.

What are you looking for in terms of price and service?

Wood drying involves many technical aspects. High-quality drying requires users to have a wide range of knowledge. Providing technical training, technical consultation and thoughtful after-sales service to users should be the basic tasks of wood drying equipment manufacturers. At present, there are quite a few "drying equipment factories". There is no support for the basic theory of wood drying. I don't understand the wood drying process. I don't even understand the basic air circulation design. I take it for granted. I use the incredible "low price." "Tempt customers. Some of these "equipment" have become a pity of "chicken ribs", and some of the dry quality is low, causing fires to occur from time to time. Excellent equipment and excellent service must be supported by reasonable prices. Too low prices are often at the expense of shoddy and irresponsible. Therefore, when selecting equipment, users should pay more attention to the reputation and service capabilities of production companies while considering the price.

I don’t know, I understand it.

Users often only consider how to save equipment investment when selecting equipment. It is not known that equipment investment is only a piece of cake with respect to the value of processed wood. With an annual output of 2000m3, the investment in equipment with good performance generally needs 200,000 yuan, but the value of 2000m3 wood is sometimes as high as 10 million yuan. Good equipment and reasonable automatic control, it is an indisputable fact that the finished product rate of wood drying is 5% higher than that of manual operation. The increase of 5% yield means 500,000 yuan per year. From a point of view, it is more cost-effective to spend 200,000 yuan to purchase equipment with good performance than to spend 100,000 yuan to purchase simple equipment.

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