ES282017A1 - A viscous thread procedure and its corresponding device for the manufacture of fibers, filaments and similar products (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

A process for spinning the viscose and its corresponding device for the manufacture of fibers, filaments and similar products, with high mechanical characteristics, a stable microfibrillar structure and excellent dimensional stability, with high viscosity viscose having a high gamma index, and containing a high gp cellulose, in a cold bath of very low concentration of acid, the preceding being notable for the fact that the filaments, spun vertically from bottom to top and unable to stand on their own are maintained from their exit from the bath by a cylinder partially at the level of the bath, or slightly below. The invention may also include the following elements, isolated or in any combination. A) the gp of the cellulose in the viscose is at least equal to 500. B) the viscosity of the viscose is at least equal to 150 poises and preferably greater than 400 poises. C) the gamma index of the viscose sent to spinning is at least equal to 45, and preferably greater than 50. D) the viscose is spun in a first cold bath containing less than 60 grams, preferably 10 to 30 grams per liter of sulfuric acid, 10 to 120 grams per liter of sodium sulfate, and without containing, or with little, zinc sulfate, then in a second hot regeneration bath. E) small quantities of an aldehyde and (or) of a modifying agent are added to the viscous and (or) to the bath. F) the filaments are stretched 100 percent at least, preferably at least 160 percent, this stretch can be transmitted during air travel between two baths and (or) in a second diluted acid bath and hot. G) the gamma index and the bath are chosen in such a way that they always ensure a substantially neutral gel at a slight distance from the row. (Machine-translation by Google Translate, not legally binding)