配向性ストランドボード(OSB)およびパーティクルボードの強度分布に及ぼす屋外暴露の影響
配向性ストランドボード(OSB)およびパーティクルボードの強度分布に及ぼす屋外暴露の影響
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户外暴露对定向刨花板（OSB）和刨花板强度分布的影响
DOI：
10.2472/jsms.49.384
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
秀一 川井
中科院分区：
文献类型：
--
作者：
知行 林;敦 宮武;秀一 川井
为了研究人造板强度退化的机理，进行了户外暴露试验和强度测试。使用的样本是商业定向刨花板（OSB）和刨花板（PB），它们在林业和林产研究所的现场测试现场在室外条件下暴露了1年、3年和5年。为了研究板材的弹性模量 (MOE)、断裂模量 (MOR) 和内部粘合强度 (IB) 的概率特性，在一种测试条件下测试了 60 或 75 个样本。考虑到元件的粘附力退化和回弹，研究了这些强度特性分布的转变。用点粘附力退化模型解释了板材强度退化的机制。对于PB，暴露一年后点附着力的下降主要发生在表层，并降低了板的MOE和MOR。但不会发生回弹，因为降解量不足以引起回弹。两三年后，板的厚度增加，因为许多足以限制回弹的有效点不再留在表层。 5年后，表层的有效斑点减少，撕下一部分颗粒。虽然OSB的降解速度总体上低于PB，但由于表面粗糙，一些水更容易渗入板内，即使暴露一年后也会出现回弹。由于退化在电路板上均匀发生，MOE 和 MOR 之间的关系不会改变。 5年后，板的厚度会增加，因为足以限制回弹的有效点已不复存在。
To study the mechanism of strength degradation of wood-based panels, outdoor exposure tests and strength tests were conducted. Specimens used were commercial oriented strand boards (OSB) and particle boards (PB) which had been exposed in outdoor condition for 1, 3, and 5 years at a field testing site in Forestry and Forest Products Research Institute. To investigate probabilistic properties of modulus of elasticity (MOE), modulus of rupture (MOR), and internal bond strength (IB) of the boards, sixty or seventy-five specimens in one testing condition were tested. Transitions of the distributions for these strength properties were investigated with considering the degradation of adhesion and spring back of elements.The mechanism of strength degradation of the boards is explained with a spot adhesion degradation model. In the case of PB, the degradation of spot adhesion occurs mainly in surface layer after one-year exposure, and decreases the MOEs and MORs of the board. But spring back does not take place, because the amount of degradation is not enough to cause the spring back. After 2 or 3 years, the thickness of the board increases because a number of effective spots which are enough to restrict the spring back, do not remain at the surface layer. After 5 years, the effective spots at the surface layer decrease to tear off a part of particles.Though the rate of the degradation of OSB is lower than that of PB in general, spring back takes place even after one-year exposure because the surface is so rough that some water infiltrates into the board more easily. As the degradation occurs uniformly in the board, relationships between MOEs and MORs do not change. After 5 years, the thickness of the board increases because effective spots enough to restrict the spring back do not remain.