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The most common nonwoven is a needle-punched product. Staple fibers or continuous filaments are bonded by mechanically entangling the fibers with barbed needles. It looks and feels like black felt. Occasionally, the product will be manufactured in white or orange. Orange nonwovens serve as a warning barrier indicating contaminated soils.
Nonwoven geotextiles are permeable geosynthetics made of nonwoven materials used along with geotechnical material (soil, rock, etc.) on the integral part of a civil engineering projects. It’s produced mechanically or chemically or by heat-bonding fibres together to form stable fibre network. Nonwoven geotextiles are frequently made polymers from synthetic material like polypropylene, polyethylene, polyamide, polyester, etc. The polypropylene fibre dominates in the geotextile application, cause of its low cost, low specific gravity and strength. But nonwoven geotextiles also made from natural fibres (jute, sisal, coir, etc).
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