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建筑木材里面水分是有五个状态的

浏览量:   来源:www.ch591.com  作者:365体育在投注网站

析建筑木材中水分存在的五种状态,生活中处处都能使用到木材,对于木材大家也知道不同的时间段建筑木材里面的水分存在的状态也是不相同的.具体都有什么样的状态呢,下面厂家就给大家讲解一下建筑木材里面水分的五种状态有哪五种.

Analyzing the five states of water in building wood, we can use wood everywhere in our life. For wood, we also know that the states of water in building wood are different at different times. What are the specific states? The following manufacturers will explain the five states of water in building wood. What are the five kinds?

生材状态:刚砍伐下来的木材处于生材状态.细胞腔和细胞壁中都含有水,自由水的量随着季节变化,结合水处于饱和状态.

Raw wood state: The newly cut wood is in the raw wood state. The cell cavity and cell wall contain water. The amount of free water varies with the seasons, and the combined water is in the saturated state.

纤维饱和点:假如把生材放在相对湿度100%的环境中,细胞腔中的自由水慢慢蒸发,当细胞腔中没有自由水,而细胞壁中的结合水处于饱和状态,这时的状态称为纤维饱和点.一般纤维饱和点的含水率为30%.

Fiber saturation point: If the raw material is placed in the environment of 100% relative humidity, the free water in the cell cavity evaporates slowly. When there is no free water in the cell cavity and the binding water in the cell wall is saturated, the state is called the fiber saturation point. The moisture content of the fiber saturation point is generally 30%.

气干状态:当把生材放在大气环境中自然干燥,最终达到的水分平衡状态称为气干状态.一般来说,中国南方地区的气干含水率较高,大约为15%~16%,而北方地区则在12%~13%左右.

Air-drying state: When raw wood is naturally dried in the atmosphere, the final water balance state is called air-drying state. Generally speaking, the air-drying water content in southern China is higher, about 15%-16%, while that in northern China is about 12%-13%.

绝干状态:当木材中的自由水和结合水完全被除去时木材的状态称为绝干状态.

Absolute drying state: When free water and bound water in wood are completely removed, the state of wood is called absolute drying state.

纤维饱和点是一个临界状态,一般自由水的量对木材的物理性质影响不大,而结合水含量的多少对木材的各项物理力学性质有很大的影响.

Fiber saturation point is a critical state. Generally, the amount of free water has little effect on the physical properties of wood, but the amount of combined water has a great influence on the physical and mechanical properties of wood.

木材的干缩湿胀现象是指木材在绝干状态至先问饱和点的含水率区域内,水分的解吸或吸着会使木材细胞壁产生干缩或湿胀的现象.当木材的含水率高于纤维饱和点时,含水率的变化并不会使木材产生干缩和湿胀.宏观表现就是木材尺寸的缩小和胀大.

Dry shrinkage and wet swelling of wood refers to the phenomenon that the wood cell wall will shrink or swell when the moisture content of wood is desorbed or absorbed in the moisture content area from the absolute drying state to the first saturation point. When the moisture content of wood is higher than the fiber saturation point, the change of moisture content will not cause the wood to shrink and swell. The macroscopic performance is wood. Reduction and expansion of size.