Nonwoven spun-bonded fabrics

Tyvek DuPont s tradename for its spun bonded, tough, strong HDPE fiber sheet product. It is used in mailing envelopes (protects contents, etc.), medical devices, and wrapping around buildings. See fabric, nonwoven spun-bonded. 

One of the important aspects of the development of P-plastomers was the expectation that these materials were amenable to plastics processing such as fiber and film formation and yet would yield soft elastic fabrication. This combination was hitherto unknown [24]. The formation of nonwoven fabrics including spun-bond and melt-blown nonwoven fabrics as well as their laminated forms has been documented. Similarly, cast film operation to form elastic monolithic films or composite structures which are not only amenable to these processes, but also to a variety of postfabrication processes have been described. 

Nonwoven spun These fabrics include spun-bonded, flash-spun, melt-blown, and mechanical nonwoven swirl. They are used in durable and disposable products that include interlining-interfacing (apparel), carpet backing, geotextile, roofing, industrial filtration media, surgical apparel, medical dressing, and diaper. 

Nonwoven spun-bonded They are distinguished from other nonwoven fabrics by a one-step operation that provides a complete chemical to fabric route. The process integrates the spinning, lay-down, consolidation, and bonding of continuous filaments to form fabrics. Its largest growth area is disposable diaper cover stock. 

Nonwoven fabrics are generally described by the method of production, eg, needle-punched or spun-bonded (120). ASTM D1117 discusses various physical properties to be deterrnined for nonwoven fabrics and the standard procedures used. 

Nonwovens The textile and paper industries are based on the two oldest (wet and dry) processes. Manufacturers of nonwovens for plastics draw on both. With the wet, there are basically two types namely the Fourdrinier and cylinder machine types that have been modified. In addition, two basic types exist for the process formation of the web and application of the bonding agent or system where mechanical carding of fibers is used. The particular equipment and method of operation to be used, with their many modifications, is influenced by desired requirements such as mechanical properties, softness, surface condition, tenacity, etc. There are certain t) es of so-called nonwoven fabric that are directly formed from short or chopped fiber as well as continuous filaments. They are produced by loosely compressing together fibers, yarns, rovings, etc. with or without a scrim cloth carrier assembled by mechanical, chemical, thermal, or solvent methods. Products of this type include melted and spun-bonded fabrics. 

Nonwoven melt-blown These fibers are composed of discontinuous filaments and are smaller than those of spun-bonded fabrics. Fibers produced are very fine with a typical diameter of 3 pm. Most commercial products are made of polyester or high melt-flow polypropylene plastic. 

Polymer extrusion-based processes Some of the most significant contributions to the nonwoven industry came from the development of the direct polymer-to-fabric converting processes. These processes include spun-bonding, melting-blowing, and porous film. Nonwovens made by these processes are known as spunbond (SB) nonwovens, melting blown (MB) nonwovens, and apertured-fllm nonwovens. 

All sheet structures made directly from fibers and filaments without intermediate steps are classified under the term textile composites. In the English-speaking world, a general distinction is made between nonwoven fabrics made from stable fiber and spun-bonded sheet products manufactured from filaments. 

Smorada, R.L., Nonwoven Fabrics (Spun Bonded), Kirk-Othmer Encyclopedia of Chemical Technology, 4th Ed., Vol. 17, eds. J.I. Kroschwitz and M. Howe-Grant, Wiley, New York, 1996, pp. 336-368. 

Although other nonwoven processes such as spimlacing have experienced large growth in disposable wipes, spimbonded fabrics have not participated in this segment generally because some cellulosic fibers are required in the wipe and spun bonding cannot readily utilize such fibers. 

With consideration of the requirements of avoidance of fibre shedding in the filtration process, nonwoven fabrics made from continuous fibres such as melt blown, spun-bond, and hydroentangled nonwovens and electrospun/centrifugal spinning nanofibre nonwovens, as well as their composite combinations comprising both microfibres and nanofibres, are widely used in microfiltration as a water filtration media. They... 

Spun-Bonded Products n Nonwoven fabrics formed by filaments that have been extruded, drawn, then laid on a continuous belL Bonding is accomplished by several methods such as by hot roll calendering or by passing the web through a saturated-steam chamber at an elevated pressure. 

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