As an increasingly popular type of high-performance doors and windows, the quality of aluminum-clad wood doors and windows is closely related to the selection of wood. Wood, its physical properties directly affect the quality of aluminum-clad wood doors and windows, so When purchasing aluminum-clad wood doors and windows, the characteristics of the wood are very critical. The wood of aluminum-clad wood doors and windows has two important physical properties. The reason why aluminum-clad wood doors and windows are very popular among high-end consumers has a lot to do with the fact that the interior of aluminum-clad wood doors and windows is composed of wood. The structure of the inner wood not only makes it easier to integrate interior decoration and windows, but now every building window The area is getting larger and larger, the windows can be beautiful and grand, and the interior quality of the entire house has suddenly improved a lot.
The moisture content of aluminum-clad wood doors and windows
1. Moisture in wood
There are three types of moisture in wood: free water, sorbed water, and chemical water. Among them, free water and absorbed water are the main moisture in the wood. Free water is closely related to wood density, dryness, and permeability. Water absorption affects the properties of wood, while chemical water has little to do with wood properties.
2. Wood moisture content
Wood moisture content is the ratio of the moisture contained in wood to the weight of wood, and is divided into fiber moisture content, green wood moisture content, wet wood moisture content, equilibrium moisture content, etc. Among them, raw wood moisture content and equilibrium moisture content are more important.
(1) Moisture content of raw wood: refers to the moisture content of freshly felled wood. The moisture content of raw wood has a certain significance for the transportation and storage of wood. The moisture in raw wood is mainly free water and absorbed water. Its moisture content changes with the seasons, but there is no certain pattern for each tree species.
(2) Equilibrium moisture content: refers to wood stored in the atmosphere for a long time. When the water vapor pressure in the air is greater than the water vapor pressure on the surface of the wood, the wood absorbs water from the outside; otherwise, the moisture in the wood is lost outward. If the water vapor pressure in the air is the same as the water vapor pressure on the surface of the wood, the wood will neither absorb nor lose moisture. The moisture content of the wood at this time is called the equilibrium moisture content.
The average moisture content is a wood characteristic that must be considered in the production of aluminum-clad wood doors and windows in different regions. If the average moisture content of the wood is too low but is used in humid areas, hygroscopic expansion, and profile deformation will occur, while the average moisture content is high. When used in dry areas, the wood will also deform. Therefore, the drier the wood for aluminum-clad wooden doors and windows is not the better, but wood with different moisture content needs to be processed according to the region.
Density of wood for aluminum-clad wood doors and windows
Wood density is an important indicator of wood properties and has very important practical significance. Based on the actual weight of wood, we can infer the technological properties of wood and the physical properties of wood such as dry shrinkage, expansion, hardness, and strength. There are two main types of wood density: basic density and air-dry density:
1. Basic density:
Because the weight of air-dried wood and the volume of raw wood is relatively stable and the measurement results are accurate, it is suitable for comparing wood properties and is also practical in the wood drying and anti-corrosion industries.
2. Air dry density:
It is the ratio of the weight of air-drying wood to the volume of air-drying wood. The air-drying density is usually the density of wood when the moisture content is between 8% and 20%. Our country, like other countries in the world, stipulates that the moisture content of 12% is the air-dry density in our country. The air-dry density of wood is the basic basis for the comparison of wood properties and production and use in China.
