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generations of nylon fiber

Nylon carpet fiber is in it's fifth generation

Fiber Generation Fiber Characteristics
First generation Nylon Round Fiber modelFirst generation nylon fibers were extruded or drawn in round cross-section. The drawback to round fibers is that they actually magnify dirt. Soils adhered to the far side of a round fiber are magnified in appearance on the near side of the fiber.
Second Generation Trilobal carpet fibersThe second generation of nylon fiber evolution added shapes. A tri-lobal shaped fiber has more rigidity and resilience and the many reflecting surfaces are efficient at scattering light to hide dirt. For these reasons, trilobal fibers are often used in carpets. The reflective surfaces can also give the fiber a sparkling appearance.
Third Generation Static electricity doorknob zapAnti-static qualities were added to the fibers. Carbon filament cores were introduced, and conductive coatings added. The days of near lethal electro-static shock when touching a doorknob after walking across a carpet are (mostly) over.
Fourth Generation carpet protectant worksFluorochemical soil/stain protection was added to nylon carpet. This chemically inert non-toxic treatment works by weakening the surface tension of the fibers so that they do not break the much stronger surface tension of watery liquids. Liquid spills, held together by the surface tension of the liquid itself, beads up on treated carpets, or flows around the fibers without actually coming in contact with them.
Fifth Generation fifth generation nylonThe fifth and most recent improvement to nylon fiber carpets is the addition of acid dye resistors. This treatment essentially blocks dye sites (exposed amides) on nylon polymer chains from accepting any new dyes.

Source: IICRC S100 Standard and Reference Guide to Professional Carpet Cleaning.