Abstract Present research work investigated the vertical integration of fibres by using newly proposed structural indices in needle punched nonwoven fabric. A new methodology was also proposed to measure the orientation of fibre in the Z direction of nonwoven fabric. The colour summarization technique was used to measure the percentage of fibre transfer from different layers and area covered by holes. The influence of punch density, needle penetration depth and stroke frequency on fabric structure and properties was studied and three-factor three-level Box-Behnken experimental design was used for sample preparation. The proposed structural indices provide useful information to explain the mechanism of vertical integration of fibres during punching operation. The bursting strength, mean flow pore size, filtration efficiency and pressure drop were highly influenced by considered punching parameters. A strong correlation was observed among measured properties and structural indices. Finally, punching parameters were optimised to achieve maximum filtration efficiency at minimum pressure drop.

中文翻译：

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通过在针刺非织造布中垂直整合纤维来优化复合纤维过滤介质

摘要 目前的研究工作通过使用针刺非织造布中新提出的结构指标来研究纤维的垂直整合。还提出了一种新的方法来测量非织造织物 Z 方向上的纤维取向。颜色汇总技术用于测量来自不同层和孔覆盖区域的纤维转移百分比。研究了冲头密度、针刺深度和冲程频率对织物结构和性能的影响，并采用三因素三水平Box-Behnken实验设计进行样品制备。所提出的结构指标提供了有用的信息来解释冲压操作过程中纤维的垂直整合机制。爆破强度、平均流动孔径、过滤效率和压降受所考虑的冲压参数的影响很大。在测量的特性和结构指数之间观察到很强的相关性。最后，优化冲压参数以在最小压降下实现最大过滤效率。