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    為何木材會出現表裂?

    來源:http://www.thecysterstory.com 時間:2019-12-12

      之前小編教你們如何處理腐蝕木桌的裂縫,但是并沒有詳細的解釋木桌裂縫是如何形成的。所以今天小編就來詳細解釋一下為什么木頭會出現桌子上的裂縫,這樣我們就更清楚地了解了木頭桌子裂縫的原因,這樣在以后處理木頭桌子裂縫的問題時,就會更加準確。
      The former editor taught you how to deal with the cracks that corrode the wooden table, but didn't explain in detail how the cracks formed. So today, Xiaobian will explain in detail why there are cracks on the wood table, so that we can understand the causes of the cracks on the wood table more clearly, so that when dealing with the cracks on the wood table in the future, it will be more accurate.
      表面裂紋:指表面裂紋。表面裂紋是指木材或成品木材表面的裂紋。裂紋通常局限于弦面,呈放射狀發展。淺裂紋可以通過刨平去除,但深裂紋不僅美觀,而且會降低木材的強度,尤其是抗剪強度。表面裂紋也會影響防腐木材的油漆質量。木器漆表面有裂紋后,由于氣候條件的變化,裂紋會打開或關閉,導致漆膜斷裂。木材表面裂紋產生的原因是木材內外干燥不均,徑向收縮和弦向收縮的差異是一個重要的附加因素。
      Surface crack: refers to surface crack. Surface crack refers to the crack on the surface of wood or finished wood. Cracks are usually confined to the chordal plane and develop radially. Shallow cracks can be removed by planing, but deep cracks are not only beautiful, but also reduce the strength of wood, especially the shear strength. The surface crack will also affect the paint quality of anticorrosive wood. When there are cracks on the surface of wood paint, due to the change of climate conditions, the cracks will open or close, causing the paint film to break. The reason of wood surface crack is uneven drying inside and outside, and the difference of radial shrinkage and chord shrinkage is an important additional factor.
      防腐木材干燥后,首先從表面蒸發水分。當表層含水率降低到纖維飽和點以下時,表層木材開始收縮,但相鄰內側木材含水率仍在纖維飽和點以上,不收縮。表面木材的收縮受到內部木材的限制,不能自由收縮,從而造成木材的內應力:表面木材被拉,內部木材被壓。干燥條件越強,木材含水率差異越大,內應力越大。如果表面的拉應力超過了木材的橫向抗拉強度,木材組織就會被撕裂。由于組織沿木射線的拉伸強度比相鄰木纖維的拉伸強度小,裂紋首先沿木射線產生。
    山東防腐木
      After the preservative wood is dried, the moisture is evaporated from the surface first. When the surface moisture content decreases below the fiber saturation point, the surface wood begins to contract, but the moisture content of the adjacent inner wood is still above the fiber saturation point and does not contract. The shrinkage of the surface wood is limited by the internal wood, which can not shrink freely, thus causing the internal stress of the wood: the surface wood is pulled, and the internal wood is pressed. The stronger the drying condition, the greater the difference of moisture content and the greater the internal stress. If the tensile stress on the surface exceeds the transverse tensile strength of the wood, the wood tissue will be torn. Because the tensile strength of the tissue along the wood ray is smaller than that of the adjacent wood fiber, the crack first occurs along the wood ray.
      因此,導致木質臺面開裂腐蝕的主要因素可以說是由于生產加工不當造成的木質臺面開裂,而這個問題是用戶無法決定的。為了避免這種情況的發生,每個人都在選擇這個木材,必須仔細選擇,從而選購優質的木材,甚至在使用后期做好維護工作同時,這樣才可以避免遇到木材開裂的問題在更大程度上。
      Therefore, the main factor leading to the cracking and corrosion of the wooden table can be said to be the cracking of the wooden table caused by improper production and processing, and this problem can not be determined by the user. In order to avoid this kind of situation, everyone is choosing this wood, and must carefully choose, so as to choose high-quality wood, and even do a good job of maintenance in the later stage of use at the same time, so as to avoid the problem of wood cracking to a greater extent.