Nonwoven geotextiles from continuous filament

Nonwoven geotextiles made from continuous filament... 

Nonwoven geotextiles made from continuous filament are obtained from a one-step process, which transforms polymer pellets into a geotextile with its final characteristics. This is an economical process for light-weight and medium-weight geotextiles because it allows very high-volume, one-step production. 

In the case of nonwoven geotextiles made from continuous filaments, a heat process using calendering is most often used. The filament web spread on the feed apron is directed to a calendar where it will be compressed at a high temperature by two heated metal rollers. The heat and pressure cause the filaments to fuse together where they touch in this way, they form a cohesive filament stmcture. Depending on the product required, the calendar can be smooth or have a surface embossing pattern which... 

Mechanical bonding performed by needling, as shown in the last section, can also be used to produce nonwoven geotextiles made from continuous filaments. However, this bonding method is slower than the heat method, which limits production... 

Nonwoven fabrics have played an important part in the development of geotextile applications. Needle-punch fabrics manufactured from either staple fibers or spunbonded continuous filaments have found worldwide acceptance on the basis of field performance. In 2000, it is estimated that North America consumed approximately 300 million m of geotextiles (62). 

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