Directional permeability in homogeneous nonwoven structures Part II: Permeability in idealised structures

The application of a newly derived model of directional permeability, presented in Part I of this series of papers, is described for a range of specific fibre-orientation profiles. A consideration of the permeability results predicted by both the new model and existing theoretical and empirical models indicates that it is of practical use..

Directional permeability in homogeneous nonwoven structures Part I: The relationship between directional permeability and fibre orientation

A new general model of the directional permeability in homogeneous, and anisotropic nonwoven structures is presented. It is based on drag-force theory and D'Arcy's Law. Structural parameters in the fabric are considered, including fibre diameter, porosity, and the fibre-orientation distribution. The governing equations of the local permea..

ATME-I 2000 survey 3: Nonwoven equipment

The author highlights companies which exhibited machines and equipment in the nonwavers filed at the show. These include Befoma of Poland, Christoph Burck-hordt, Chase Machine & Engineering Inc, Dilo, Fehrer, Fleissner, Groz-Beckert, GS Technologies, Kleinewefers, Laroche, Schlumberger, SNF and Tinitex. Companies which apted for poster, v..

Cotton-blend nonwoven fabrics for medical use

A research program was undertaken to determine optimum blends of cotton blend nonwovens. The effect of fibre type and blend proportion on absorbency, air permeability, flexural rigidity and tensile strength in grey state and bleached/scoured fabrics were evaluated. The authors conclude that the majority of fabric properties can be predict..

A study of the airflow and fiber dynamics in the transport chamber of a sifting air-laying system: Part 1

The structural architecture of air-laid webs produced from short fibres is largely dependent on the manner in which fibres are assembled together during the web formation process. An improved understanding of the behaviour of fibrs during air-laying is essential to provide a basis for more effective engineering of the structure and proper..

Pore size and air permeability of four nonwoven fabrics

The relationship between pore size and air permeability in two spunlaced fabrics and two spunbonded/meltblown/spunbonded (SMS) fabrics were investigated. Minimum, maximum and means flow pre sizes were determined using liquid porosimetry. The influence of fabric weight and thickness on air permeability and pore sizes was also evaluated. Fo..

A study of the airflow and fibre dynamics in the transport chamber of a sifting air-laying system: Part 2 - fiber dynamics

In Part 1 of this paper(International Nonwovens Journal, Summer 2000), the airflow characteristics in the transport chamber of a sifting air-laying system of the Kroyer type [US patent 4,144,619] was reported. In Part 2, the fibre dynamics in the transport chamber of the machine are investigated. These are of major practical importance be..

Cotton Fibers Mechanical and Surface Properties and Their Impact on Capillary Absorption in Nonwoven Structures.

Researchers investigated the effects of the mechanical and surface properties of cotton fibers on capillary absorption in nonwoven fabrics. The gravimetric absorbency testing system consisting of a balance and two sensors measured the capacity and rate of absorbency. A dynamic contact angle experiment measured the surface energies of cott..

The Role of Structure on Mechanical Properties of Nonwoven Fabrics.

A study of the tensile modulus, maximum stress in tension, and elongation at maximum stress of thermally point bonded nonwoven fabrics bonded at different bonding temperatures used image acquisition and analysis methods to identify failure mechanisms and quantify fiber orientation distribution function, bond region strain, and unit cell s..

Nonwovens Research: A New Initiative at the ITC.

The International Textile Center's nonwoven fabric research program will develop protective fabrics for use against hazardous agents. The Center's purchased a Fehrer H1 technology needle loom, which has an innovative needle zone that improves the structural features of nonwoven fabrics, and a William Tatham Microfeed 2000 feed monitoring ..