Rivet head technique of manufacturing carpets/rugs was introduced in the year 1972 by an aeronautical engineer in Vienna, Austria.
The pile is formed by moving a predetermined length of yarns with the help
of a hollow needle inserted through the base or the backing fabric. When the
hollow needle is withdrawn, The constrictive cation of the backing causes
the end to bloom, or spread out , like a rounded rivet head. A latex mist is
sprayed onto the back to lock the rivet heads in place.
Pile height is determined by the length of the yarn passed through the
hollow needle through the backing. Pile density is determined by the
closeness of the needle thrusts.