Abstract: The production of organic fibers with inorganic cores is set forth. Inorganic, such as glass, fibers are attenuated from a bushing and then covered individually or in small groups with organic sheaths. With individual fibers, rows or orifices in a bottom of the bushing are staggered so as to equally space the filaments. The applicator for applying the organic sheaths has one groove for each of the individual fibers for applying the organic material and for maintaining the fibers separated therebelow. The applicator can be mounted in a manner such that it can be retracted from an operating position in engagement with the filaments when the bushing operation is stopped, raised to a position near the bushing bottom, and moved into engagement with the fibers again to automatically place one fiber in each groove when the bushing is restarted. The applicator is then moved down to the operating position again when the bushing is back in normal operation.

Abstract: The production of organic fibers with inorganic cores is set forth. Inorganic, such as glass, fibers are attenuated from a bushing and then covered individually or in small groups with organic sheaths. With individual fibers, rows or orifices in a bottom of the bushing are staggered so as to equally space the filaments. The applicator for applying the organic sheaths has one groove for each of the individual fibers for applying the organic material and for maintaining the fibers separated therebelow. The applicator can be mounted in a manner such that it can be retracted from an operating position in engagement with the filaments when the bushing operation is stopped, raised to a position near the bushing bottom, and moved into engagement with the fibers again to automatically place one fiber in each groove when the bushing is restarted. The applicator is then moved down to the operating position again when the bushing is back in normal operation.

Abstract: It has been suggested that synthetic multifilamentary yarns can be produced by melt-spinning a polyamide or polyester polymer under conditions of substantially simultaneous spinning and drawing wherein prior to said drawing the filaments of the fiber are lubricated with a spin finish by surface contact with a lube roll surface of not less than about 90 RMS. However, in commercial operation of the process at high throughput rates of 50 pounds per hour or greater through the spinneret, serious problems have been encountered due to "flicking" or momentary slackness of one or more filaments from the main yarn bundle above the lube roll, which flicking results in production of yarn of relatively poor quality. It has now been found that the occurrence of said flicking of the filaments can be greatly reduced by applying the spin finish from a convergence guide having a yarn-lubricating surface of not less than about 10 RMS and means for distributing a film of lubricant over said surface.