Back to results
US 5,207,959 AGranted
Process for obtaining pet yarns with an improved production efficiency
AssigneeRhone-Poulenc Fibres
InventorsPaul Antikow, Francois Pinaud
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeRhone-Poulenc Fibres
InventorsPaul Antikow, Francois Pinaud
Estimating the term…
Process for improving the production efficiency of the spinning of an undrawn, preoriented yarn based on polyethylene terephthalate (PET) by the introduction, before the spinning, of 0.03 to 0.1% by weight of fumed silica with a particle size of between 5 and 15 nm into the molten polymer in the form of dispersion in a masterbatch of the same polymer as that to be processed, then spinning the PET containing the silica in the finely dispersed state, the filaments being next cooled by means of a gas stream at temperature between 17.degree. to 22.degree. C. and then sized and wound at a velocity of between 3500 and 5000 m/min. The gain in production efficiency, evaluated in relation to the shrinkage of the filaments in dry air at 180.degree. C., is at least 7%, generally at least 10-15%.
Process for improving the production efficiency during the spinning of an undrawn, preoriented yarn based on polyethylene terephthalate (PET) at a velocity of at least 3000 m/min, characterized in that, before the spinning, 0.03 to 0.1% by weight of fumed silica with a particle size of between 5 and 15 nm is introduced into the molten polymer in the form of dispersion in a masterbatch of the same polymer as that to be processed, followed by spinning of the PET containing the silica in the finely dispersed state, the filaments being next cooled by means of a gas stream at temperature between 17.degree. to 22.degree. C. and then sized and wound at a velocity of between 3500 and 5000 m/min.
Dependencies are inferred from the claim text.