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为何木材会出现表裂?

来源:http://www.jnajgc.com 时间:2019-12-12

  之前小编教你们如何处理腐蚀木桌的裂缝,但是并没有详细的解释木桌裂缝是如何形成的。所以今天小编就来详细解释一下为什么木头会出现桌子上的裂缝,这样我们就更清楚地了解了木头桌子裂缝的原因,这样在以后处理木头桌子裂缝的问题时,就会更加准确。
  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.
  表面裂纹:指表面裂纹。表面裂纹是指木材或成品木材表面的裂纹。裂纹通常局限于弦面,呈放射状发展。浅裂纹可以通过刨平去除,但深裂纹不仅美观,而且会降低木材的强度,尤其是抗剪强度。表面裂纹也会影响防腐木材的油漆质量。木器漆表面有裂纹后,由于气候条件的变化,裂纹会打开或关闭,导致漆膜断裂。木材表面裂纹产生的原因是木材内外干燥不均,径向收缩和弦向收缩的差异是一个重要的附加因素。
  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,首先从表面蒸发水分。当表层含水率降低到纤维饱和点以下时,表层木材开始收缩,但相邻内侧木材含水率仍在纤维饱和点以上,不收缩。表面木材的收缩受到内部木材的限制,不能自由收缩,从而造成木材的内应力:表面木材被拉,内部木材被压。干燥条件越强,木材含水率差异越大,内应力越大。如果表面的拉应力超过了木材的横向抗拉强度,木材组织就会被撕裂。由于组织沿木射线的拉伸强度比相邻木纤维的拉伸强度小,裂纹首先沿木射线产生。
山东防腐木
  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,导致木质台面开裂腐蚀的主要因素可以说是由于生产加工不当造成的木质台面开裂,而这个问题是用户无法决定的。为了避免这种情况的发生,每个人都在选择这个木材,必须仔细选择,从而选购优质的木材,甚至在使用后期做好维护工作同时,这样才可以避免遇到木材开裂的问题在更大程度上。
  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.