Yarn process

In a process for producing false twist crimped multifilament yarn wherein yarn is fed over the outer periphery of a rotating disc, the improvement comprising causing said yarn traveling at running speeds of at least 1000 feet per minute to pass over a disc, the yarn contacting surface of which is inorganic with a hardness of greater than 975 on the Knoop.sub.100 scale, a coefficient of friction sufficient to grip and torque said yarn and a surface texture of more than 75 and less than 400 peaks of at least 50 microinches in height per linear inch.

In a process for producing false twist crimped multifilament yarn, wherein yarn is fed over the outer periphery of a rotating disc, the improvement comprising causing said yarn traveling at running speeds of at least 1000 feet per minute to pass over a disc, the yarn contacting surface of which is inorganic with a hardness of greater than 975 on the Knoop.sub.100 scale, a coefficient of friction of not less than 0.28 and a surface texture of more than 75 and less than 400 peaks of at least 50 microinches in height per linear inch.