Process for producing oriented continuous yarns

Claim 1

A high speed single step process for producing pre-oriented synthetic yarn comprising melt spinning a plurality of synthetic thermoplastic filaments, cooling the filaments with a cooling gas, merging said filaments into a twisted bundle, sliding said bundle through a pigtail guide which is cocked at an angle, the angle between the yarn direction and the axis of the guide being less than 40° but sufficient so that the bundle actually slides along the guide, said sliding contact producing twist upstream of said pigtail guide so that there is a compact bundle immediately upstream of said pigtail guide, passing said yarn to a horseshoe guide which twists the bundle in opposite direction from the pigtail guide so as to produce an untwisted yarn in ribbon form between the pigtail and horseshoe guides, lubricating the ribbon of filaments between said guides, and downstream of said horseshoe guide for the first time contacting said yarn with an advancing roll, said roll taking up the yarn at a speed of from 2500 to 6000 meters per minute.