By R Chapman
One of many quickest starting to be and most fun sectors of the textiles industry, nonwovens supply a wide spectrum of finish makes use of, starting from clinical items to inside textiles. This ebook makes a speciality of the diversity of technical nonwoven purposes to be had. half one examines the fundamental rules of nonwoven materials, and contains themes resembling the formation of nonwovens and the impression of fibre and upholstery houses on nonwoven functionality. half offers useful examples of the way nonwoven fabrics can be utilized in quite a few cloth items for attire, filtration, and private hygiene. With its choice of foreign participants, this book provides a big reference for execs and teachers fascinated by the construction, expertise, and use of nonwoven fabrics, extending from the clinical fabric to the attire quarter.
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Extra info for Applications of Nonwovens in Technical Textiles (Woodhead Publishing Series in Textiles)
42 at the same time. 2 Air permeability The pressure drop of a fluid flow across a medium is determined by the medium’s properties including fiber diameter, packing density and thickness, as well as the fluid properties such as the fluid viscosity and the fluid velocity as expressed in Eq. 37. Introducing Darcy’s law from Eq. 25 into Eq. 37 to replace the ∆P in Eq. 41] The permittivity (κ) is a function of the web packing density and the fiber diameter. One can substitute Eq. 41 into Eq. : . e.
Theo. 5 – – Exp. large pore size in needled felts using a pore size analyzer. For a more porous medium, there is a significant difference between the measured and calculated data because the medium is compressed more by the applied test pressure. Therefore, the fabric shows a smaller pore size and a lower air permeability. 37] The pressure drop (∆P) of the fluid flow through a medium can be theoretically calculated using Eq. 37 if the packing density and the fiber diameter of the web are known.
The velocity at the entrance of the medium. By correcting the fluid traveling length and velocity in the medium, using the web thickness (t) for the channel length (L), Eq. D. D. 2 An apparatus to measure the flow rate and pressure drop of a fluid flow through a medium (ASTM F902-84). – where D is the average circular-capillary-equivalent pore size (ACCP). Substituting the tortuosity (T) by Eq. 18] One can calculate the ACCP from the pressure drop of a fluid flow through the medium. 2. 2 shows a piece of apparatus for measuring the pressure drop of a fluid flow through the medium.