Effect of fiber orientation on pore size characteristics of nonwoven structures

Abstract

Fiber orientation is a key parameter affecting the geometrical, hydraulic and mechanical properties of nonwoven materials. The effect of fiber orientation on the pore size has been experimentally investigated based on air-laid, parallel-laid, and cross-laid structures following through-air bonding. It was evident that there is a discernible difference between the mean flow and maximum pore sizes of these nonwoven materials. The influence on pore size was further elucidated by evaluating experimental and theoretical models based on sieving-percolation pore network theory including a model that incorporates directional parameter to account for the effect of fiber orientation. It was established that good agreement with experimental data can be obtained using such a model.

A model for predicting uniaxial compression behavior of fused fibrous networks

“…Fibrous networks are defined as random in nature in which the constituent fibers possess isotropic orientation distribution whereas the preferentially aligned fibrous network consists of majority of fibers being aligned in a defined direction. Here, a set of random fibrous network was prepared by aligning the bicomponent (core-sheath) polyester fibers using ''air-laying'' process in which high-speed air stream separates and deposit the fibers in the form of fibrous web (Rawal et al, 2010;Russell, 2007). Subsequently, these fibrous webs were fused using thru-air (thermal) bonding process in which the sheath of the fibers was melted at 120°C to fabricate a random fused fibrous network.…”

An Overview of Nonwoven Product Development and Modelling of Their Properties

“…Porosity and fibre composition determines the product as based on its functional requirement. Rarely nonwoven materials used as elastics voluminous fillers and local stiffeners [6][7][8][9][10].…”

Development of an Algorithm to Determine the Liquid Spreading Area of Airlaid Nonwoven Fabrics by Image Processing Method

“…The literature search put forward that the absorbency is one of the important properties that depends on the nonwoven fabric's porous structure, which is measured as vertical capillary (wicking), horizontal wicking and glass tube wicking. These test methods are applied to baby diapers and sanitary napkin, especially for hygiene purposes [6][7][8][9][10][11].…”