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首页> 外文期刊>Journal of Wood Chemistry and Technology >Fundamentals of MDF Panel Dimensional Stability: Analysis of MDF High-Density Layers
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Fundamentals of MDF Panel Dimensional Stability: Analysis of MDF High-Density Layers

机译：MDF面板尺寸稳定性的基本原理：MDF高密度层的分析

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The inherent resin and fiber chemistry of medium density fiberboard (MDF) panels has been compared with panel cold water soak properties. In hot-pressed panels it was observed that resin type and hydrophobicity significantly impact panel swell behavior. Resin affects both fiber hydrophobicity and equilibrium moisture content (EMC), but does not prevent water uptake. It is the influence of resin type on high-density layer thickness swell which suggests resin efficacy is important to retaining bonding in the fiber network and resisting fiber spring-back and panel swell. Fiber contact angles were found to be of less importance, only manifesting when comparing E0 and El urea formaldehyde (UF) resins. The E0 panel was considerably more hydrophilic, impacting its wetting behavior, and contributing to greater panel layer thickness swells. For coldpressed panels, the absence of a high-density layer and relative fiber hydrophobicity were important. Cold-pressed polymeric methylene diisocyanate (pMDl) panels had greater hydrophobicity than El UF resin panels which, together with the greater bonding of pMDI, led to improved panel water soak properties. In the case of the cold-pressed El UF resin, the relatively hydrophilic fiber and relatively even density profile contributed to an extremely poor water soak performance. Overall, results show that the interactions of contributing factors to panel swell are complex and all may significantly affect panel water soak behaviors.
机译：已将中密度纤维板（MDF）面板固有的树脂和纤维化学性质与面板冷水浸泡性能进行了比较。在热压面板中，观察到树脂类型和疏水性显着影响面板的溶胀行为。树脂会影响纤维的疏水性和平衡水分含量（EMC），但不会阻止水分的吸收。树脂类型对高密度层厚度膨胀的影响表明树脂功效对于保持纤维网络中的粘结以及抵抗纤维回弹和面板膨胀很重要。发现纤维接触角的重要性较小，仅在比较E0和El脲甲醛（UF）树脂时才显示出来。 E0面板的亲水性明显更高，影响其润湿性能，并导致更大的面板层厚度膨胀。对于冷压面板，缺少高密度层和相对的纤维疏水性是重要的。冷压聚合的亚甲基二异氰酸酯（pMD1）板材比El UF树脂板材具有更大的疏水性，再加上pMDI的更大结合，可改善板材的水浸性能。对于冷压的El UF树脂，相对亲水的纤维和相对均匀的密度分布导致极差的水浸性能。总体而言，结果表明，影响面板膨胀的因素之间的相互作用是复杂的，并且都可能显着影响面板的浸水行为。

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