By R Chapman
One of many quickest turning out to be and most fun sectors of the textiles industry, nonwovens supply a vast spectrum of finish makes use of, starting from clinical items to inside textiles. This ebook specializes in the diversity of technical nonwoven functions to be had. half one examines the fundamental ideas of nonwoven materials, and comprises issues similar to the formation of nonwovens and the effect of fibre and upholstery homes on nonwoven functionality. half offers invaluable examples of the way nonwoven fabrics can be utilized in quite a few cloth items for attire, filtration, and private hygiene. With its number of overseas members, this book provides a major reference for execs and teachers eager about the construction, expertise, and use of nonwoven fabrics, extending from the scientific cloth to the attire area.
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Extra info for Applications of Nonwovens in Technical Textiles (Woodhead Publishing Series in Textiles)
1 into Eq. 162 µm. The geometrical fiber diameter (dg) is equal to the effective fiber diameter (df) if the fiber is round in shape and uniform in size. For meltblown fabrics, the effective fiber diameter (df) is always greater than its geometric fiber diameter (dg) as can be observed from the experimental master curve in Fig. 7. 7 is a master curve of the effective fiber diameter and the geometric fiber diameter of a meltblown web. The scanning electron microscope (SEM) average fiber diameter can be obtained from the calculated effective fiber diameter through the master curve.
The weight of the air) is insignificant compared with the pressure force on the liquid. If the flow through the porous medium is not laminar, then the inertial term needs to be modified. A modified Darcy’s law has been suggested by H. C. 23] in which the turbulent term or the inertia term, µ ∇2 v0, is included. For most of our applications, the fluid flow through the nonwoven is laminar. Therefore, we use Eq. 22 for further derivations. If the fluid flow is unidirectional and is perpendicular to the medium, Darcy’s law becomes a one-dimensional flow.
Using Eq. 49. Similarly, one can rewrite Eq. 51] where µi is the filtration index of each individual component of the composite. Given the filtration efficiency of each web, the filtration efficiency of a combination or a multiple of the webs can be calculated using Eq. 5 as an example of the combination of meltblown and spunbond fabrics, or a multiple of the meltblowns. Conversely, given the FE of a fabric weight, the weight of fabric needed to achieve a desired FE can be calculated using Eq. 49.