Relationship between Fiber Orientation and Twist of Circuit Board with Aramid Fibers
Relationship between Fiber Orientation and Twist of Circuit Board with Aramid Fibers
复制标题
芳纶纤维电路板纤维取向与捻度的关系
DOI：
10.2115/fiber.54.8_421
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
K. Koyama
中科院分区：
文献类型：
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作者：
S. Nagata;Y. Kawakita;K. Koyama
从纤维取向引起的热收缩的角度研究了含有芳纶纤维的电路板的捻度。纤维取向是通过微波方法测量的，该方法基于介电各向异性。已证实可以根据样品的介电各向异性来估计纤维取向。微波法测得的单轴取向玻璃纤维的介电各向异性与混合定律吻合较好，说明了岛海结构中岛（纤维）形状引起的介电各向异性的出现。另一方面，通过热机械分析研究了微波法的热膨胀系数与取向度之比。我们提出的电路板扭曲模型的计算结果与日本工业标准测量的值非常一致。为了使两层电路板的扭曲最小化，两层板的定向度应最小或两层板的定向角应相同。
The twist for circuit boards containing aramid fibers was investigated from the viewpoint of the thermal shrinkage caused by their fiber orientation. Fiber orientation was measured by microwave method, which is based on the dielectric anisotropy. It was confirmed that the fiber orientation could be estimated from the dielectric anisotropy of samples. The dielectric anisotropy measured by microwave method for uniaxially oriented glass fibers was in good agreement with the law of mixture, which shows the appearance of dielectric anisotropy caused by the shape of island (fiber) in the islands-sea structure. On the other hand, the ratio of coefficient of thermal expansion against the orientation degree by microwave method was studied by thermomechanical analysis. Calculated results by our proposed model for the twist of circuit boards were in good agreement with values measured on Japanese Industrial Standard. In order to minimize the twist of two-ply circuit board, the orientation degrees should be minimum or orientation angles of two ply should be the same.