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Sec. 1.2 Overview of Geotextiles <br />^ -1. <br />-'t <br />■•asrvS't'f.' . ^ tV$i <br />U %i <br />V f <br />■ J-Tiu <br />|w»^' <br />w 'M 4:. <br />'.4 <br />IT <br />■^#^1 <br />» '*» <br />'■'.1 <br />Figure 1.3 Enlarged photographs of ta( <br />Donwoven. (bi woven, and (c) knit fabrics. <br />I After l\DA [I3J.i <br />tion, web formation, web bonding, and post-treatment. Within each categor\’ are many <br />possibilities, so only those most common to current geotextiles will be described. <br />1.2.2.1 Spun>Bonded Process <br />Spun bonding is a continuous process used to produce a finished tabric from a <br />polymer. A polymer, or several polymers, such as polyester, polyamide, polypropylene, <br />polyethylene, or others, is fed into an extruder. As it flows from the extruder, it is <br />forced through a spinneret or a senes of spinnerets. .After cooling, the resulting con- <br />r <br />•1. <br />M. <br />o <br />•• <br />—-------