Sports wooden floor is a kind of solid wood floor, in which the high and low moisture content will lead to moisture shrinkage and moisture expansion, which will increase the gap and the floor will arch. First, it increases the possibility of athletes being injured. Second, it affects the use and beauty of the entire sports venue. Customers will often mention the problem of moisture content in wood. I will give you a popularization:
First, the definition of moisture content
Wood and its products under normal conditions will have a certain amount of moisture. In my country, the percentage of the weight of moisture in the wood to the weight of the wood after drying is defined as the moisture content of the wood. The moisture content can be calculated based on the weight of the whole dry wood. The calculated value is called moisture content, and is abbreviated as moisture content (W, %).
Calculation formula: W=(Gs-Ggo)/Ggo×, W1=(Gs-Ggo)/Gs×
Among them: W——moisture content of wood; W1——relative moisture content of wood
Calculation formula: W=(Gs-Ggo)/Ggo×, W1=(Gs-Ggo)/Gs×
Among them: W——moisture content of wood; W1——relative moisture content of wood
Gs - wet wood weight;
Ggo - absolute dry weight.
**Standard: Moisture content between 3.0 -10.0%.()
Second, the relevant knowledge of moisture content
importance
Why do some wooden doors, wooden floors, wooden furniture and other wooden products have quality problems such as cracking and deformation after they are sold? How to reduce the loss of these problems to the wood industry?
After the production of wood products, the shape and material will not change. At this time, the key factors that determine the inherent quality of wood products are the moisture content and drying stress of sports wood flooring. Manufacturing enterprises need to correctly grasp the moisture content of wood products. When the wood product reaches the equilibrium moisture content, the wood at this time is not easy to crack and deform.
Distributors who sell wood products should also test the moisture content of the products they sell to grasp the quality status of the products they sell. Choose manufacturers with good product quality, and all manufacturers who pay attention to product quality will test the moisture content of their products.
For high-quality departments purchasing wood products, with the continuous growth of professional knowledge, more and more attention is paid to the moisture content index of wood products. In the past, foreign buyers paid great attention to this indicator, and many wood manufacturers who made export products and semi-finished products had a deep understanding of this.
appropriateness
When wood is placed in a certain environment, after a long enough time, its moisture content will tend to an equilibrium value, which is 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 shrink, and vice versa. For example, the average annual equilibrium moisture content in Guangzhou is 15.1%, while that in Beijing is 11.4%. Wood dried to 11% is suitable for Beijing, but it will hygroscopically expand and deform when it can be used in Guangzhou. Therefore, the drying of wood should be appropriate, not the more dry the better. Different regions and different uses have different requirements for wood moisture content.
Equilibrium moisture content
Wood is a hygroscopic material. When wet wood is placed in the air, it will continuously evaporate moisture; when dry wood is placed in the air, the moisture in the air will also be absorbed by the wood, and the speed of evaporation and water absorption will finally be equal, reaching a dynamic equilibrium state. , the moisture content at this time is the equilibrium moisture content. The equilibrium moisture content of wood is affected by atmospheric humidity and varies from region to region. The north is about 12%, the south is about 18%, and the central China is about 16%. Wood Equilibrium Moisture Content in Production
makes a lot of sense. The moisture content of furniture, doors and windows, interior decoration and other materials must be dried to below the equilibrium moisture content of the use area, otherwise the wood products will crack and deform
Relative moisture content
Fresh hardwood has a moisture content of 60%, while softwood is more than double that of hardwood. Water in wood exists in two forms - sorbed water and free water. The main purpose of air-drying the logs is to reduce the chemical adhesion of the wood to water, so that the remaining water can move freely. The higher the temperature, the faster the moisture can move, which is why cellaring saves time. However, excessive temperatures in the cellar can degrade the properties of the wood, and most cellar drying will be done as quickly as possible in order to make cheap construction cork.
3. Standard
Under the condition of ignoring the ambient humidity, the moisture content of wood controlled at 15% is called the standard moisture content.
NB will prepare the moisture content of the sports wooden floor to be used in the factory in advance according to the humidity of the project location. Such a move is just a small detail made by us to improve the quality, and we will continue to adhere to this practice, so as to establish the NB brand more firmly.
