Monsanto Company

Paul T Howse, Jr

Arnold E Wilkie

Rupert J Snooks, Jr

Byron E Beasley

M Allan Jacques

In producing nylon yarns having latent crimp by the process disclosed in U.S. Pat. No. 4,202,854, the polymer throughput (i.e. extrusion rate) is increased without sacrificing the amount of uniformity of the bulk resulting from development of the latent crimp by adding a nucleating agent, such as calcium fluoride, to the nylon prior to extrusion.

Nylon spin-texture process

A spin-texture process for producing polyamide yarns is described in which a freshly extruded yarn is passed between two pairs of rotating rolls and then collected. The second pair of rolls (draw rolls) is driven at a peripheral speed greater than that of the first pair of rolls (feed roll and its associated separator roll). The feed roll is maintained and a given temperature which is correlated with other processing conditions to impart a desired level of latent crimp to the yarn. Yarns prepared by the process have a potential bulk of between 10% and 50% and are particularly useful as carpet yarns.

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Pensacola, FL, United States of America

Paul T Howse, Jr