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the graded soil structure developed upstream of the bridging particles on a geotextile acting as a filter.
Filtration (geotextiles):
the process of retaining soil particles by a geotextile while allowing the passage of water. The geotextile allows the water and finer soil particles to pass through while retaining those of a coarser nature. A filter cake builds up on the face of the geotextile and this is where the actual filtration of the soil particles occurs. In order to perform this function a geotextile must be able to convey a certain amount of water across the plane of the geotextile throughout its design life. Last referenced in: Global technical textiles business update, 1st quarter 2014 (Technical Textile Markets Issue 96)
Finish oil:
oil that is put on a yarn, either flat or textured, to reduce friction during subsequent processing stages.
