皮芯结构 meaning in Chinese

skin-core structure

Study on the cross section morphology and skin - core structure of pan fiber in wet - spinning
湿法纺聚丙烯腈纤维的截面形貌与皮芯结构的研究
High - performance carbon fibers must have few voids , few score region , and they also have more graphite layers which regularly piled up and highly oriented
提高碳元素的含量，提高结晶度，减少甚至消除皮芯结构，减少孔洞，从微观上提高石墨层的取向和堆叠程度是获得高性能碳纤维的必要条件。
The re - suits demonstrate that the carbon fibers which have serious skin - core structure , few graphite layers which intricately piled up have low mechanical properties
结果表明，造成碳纤维力学性能低的直接原因可以归结为严重的皮芯结构、芯部组织疏松或有孔洞出现、晶相少且无明显取向、石墨层排列紊乱。