What are the requirements for moisture content of parquet?

Generally, it is controlled below 12%. Standard 7 11%.

There are three forms of water contained in wood, one is the water that exists in the cell cavity and the intercellular space, that is, the water that exists in the capillaries, which is called free water. The second type is water that is absorbed by the cell wall, which is called adsorbed water. The third type is the water that makes up the tissue of the cells, known as chemical water.

When the moisture of the moist wood evaporates, the first thing lost is the free water, and the moisture content when the free water evaporates and the adsorbed water is still in a saturated state is called the moisture content of the fiber saturation point.

The fiber saturation point is the turning point of the wood's performance, above the fiber saturation point, the strength of the wood is constant and does not change with the change of moisture content. At the same time, there is no change in the volume of the wood. When the moisture content drops below the fiber saturation point, that is, when the adsorbed water in the cell wall begins to evaporate, the strength increases with the decrease of the moisture content, and the phenomenon of wet expansion and dry contraction is also obvious.

The moisture content of different wood fiber saturation points is about 22% and 33%.

The humidity and temperature in each region of nature are relatively stable in different seasons. When wood is exposed to this relative temperature and humidity for a long time, its moisture content will reach a relatively constant level. At this time, the moisture content is called the equilibrium moisture content (for example, the annual equilibrium moisture content in the Shanghai area.

The equilibrium moisture content of wood varies with the temperature and humidity of the environment in which they are located, and when there is a difference between the equilibrium moisture content and the ambient humidity, it tends to be close to the environment. This results in the phenomenon of wet expansion and shrinkage of wood, which is a physical phenomenon unique to wood.

Wood is another anisotropy. The moisture content of the wood in actual use is below the fiber saturation point, so the gain and loss of water is mainly the adsorption of water by the cell wall. Most of the cells of wood grow longitudinally, and their expansion and contraction are perpendicular to the direction of the cell wall.

As a piece of flooring, we can find that there is generally no expansion and contraction in the longitudinal direction, and the expansion and contraction rate in the width direction is generally 3% to 6% (refers to the change of the moisture content of the wood below the moisture content of the fiber saturation point).

It can be seen that it is very important to control the moisture content of the floor. Not only in production, but also in laying, so that the floor is not deformed by moisture.

After consumers buy wood, a big confusion is how to identify the dryness of the wood. In the absence of the corresponding professional tools, I teach you a few tricks to quickly see if the wood is dry.

1. Look at the weight, after the wood is naturally dried, it is naturally lighter than the water-containing wood. To pick in the building materials market, you can use this trick.

2. By touch, the floor that feels cold when touching the floor with your hands is a relatively dry floor.

3. Knuckle knocking, the sound is crisp, it indicates that it is drier, and the wet sound is relatively dull.

4. Listen to the sound of woodworking planing, the sound of planing is crisp, the wood is smooth, and the shavings are hot, indicating that it is dry, otherwise it is wet.

5. Pinch a handful of sawdust to see if it is dry.

I took a screenshot on the floor 998 net,,, I hope it will be useful to you.

The moisture content of solid wood flooring is very important, it is just like the water content of the human body, it has its corresponding contrast amount, which is easy to deform when it exceeds the floor, and it is easy to crack when the floor is low.

There are certain standards for the moisture content of solid wood flooring in various regions of China, which is about 8-10 in the north, 10-12 in the south, and 6-8 in the northwest.

When buying solid wood flooring, be sure to check the certificate of conformity of the floor sold by the merchant and pay attention to the moisture content.

1. Moisture content of sports wood flooring.

The moisture content of sports wood flooring, to put it bluntly, is the ratio of water molecules in the material of sports wood flooring.

2. Influence on the moisture content of sports wood flooring.

The moisture content of sports wood flooring is the most important factor that directly affects the deformation and cracking of the floor, and the moisture content of the purchased floor must be consistent with the local equilibrium moisture content.

3. Industry standards.

After a large number of scientific experiments, the moisture content of the sports wood flooring industry standard should be 7%-12% of the sports wood floor, not more than 14%, and the inspection report must be seen clearly when purchasing.

4. Testing and acceptance.

Stadium engineers and Party A's friends, in the purchase of sports wood flooring products, it is recommended to use a moisture content tester, in the manufacturer first to determine the moisture content of the purchased varieties, and then unpack to test the moisture content of the purchased varieties of wood flooring, if the moisture content of the two is only 1% 2%, it is a qualified product.

The moisture content of sports wood flooring refers to the moisture contained in the flooring material and free mass, as long as it is made of natural materials, it contains a certain amount of moisture.

Classification of moisture content of sports wood flooring.

1) The weight of the moisture contained in the floor material and the percentage of the weight of the floor material after drying;

2) Balanced moisture content of floor material: The stable moisture content of moisture absorption or desorption stability achieved by the floor material is called the balanced moisture content of the floor material under a certain air state.