Abstract: A spin-texture process for producing crimped synthetic filaments is described in which freshly extruded filaments are passed over a 20.degree. C.-180.degree. C. roll before they are completely solidified and fully drawn as they leave the roll. In the case of polyamide filaments, spontaneous crimp as well as latent crimp is observed.

Abstract: Polyethylene yarns having tenacities of at least 12 grams per denier are produced at commercially feasible spinning speeds by a process in which a high density polyethylene having a M.sub.n of at least 20,000 and a M.sub.w of less than 125,000 is extruded through a high temperature spinneret (220.degree.-335.degree. C.) to form yarns which are hot-drawn at a temperature between about 115.degree. and 132.degree. C. The yarns produced by this process are particularly useful as industrial cordage.

Abstract: Yarns of phenylene oxadiazole/N-alkylhydrazide copolymers are made by a wet spinning process involving the steps of extruding, coagulating, washing, drying, hot-drawing and collecting. These yarns when formed into cord lose considerable tenacity, that is, cords plied from these yarns have considerably less tenacity than the individual yarns making up the cords. It has been found that this loss in tenacity in forming cords can be significantly reduced by applying a certain zirconium-containing finish to the yarn during its preparation. The finish is applied after the yarn is washed and while it is still wet.

Abstract: Yield and coke quality of a delayed coking and coke calcining process is improved by addition of coke fines to a coke drum at a temperature approximately equal to or higher than that of the incoming liquid hydrocarbon residuum feedstock during the coking operation.