Abstract: A coating composition, which is excellent in abrasion resistance, comprises spherical .alpha.-alumina particles, a binder and a solvent, in which said spherical .alpha.-alumina particles are contained in an amount of from 35 to 85% by weight of the solid content in the coating composition.

Abstract: A filamentary strand of a thermoplastic nature is ejected from an ejection nozzle being entrained on a heated medium flow into a stuffing chamber structured on a circulating endless surface moving at a speed slower than the ejection speed and the stuffed filamentary strand is transported, being carried by the endless surface, towards a downstream outlet of the stuffing room in such a way that the yarn mass is gradually compressed during displacement toward the downstream outlet of said stuffing room. During the transportation either a free or a positive cooling is employed. The resultant filamentary strand is provided with random, bulky and round three-dimensional crimps.