Patent ID: 6884378

Claim:
A method for manufacturing super-micro fibers having dimensions between 0.003 and 0.0003 denier per filament comprising the steps of: (a) Blending polyamide-polyester mixtures containing the following: (i) 30-50% by weight mixture of polyamide compounds; (ii) 40-65% by weight mixture of terephthalic acid, ethylene glycol with diol and diacids or isophthalic compounds; and (iii) 5-10% by weight of affinity mixture containing terephthalic acid, ethlylene glycol and 5-sodium sulfodimethyl isophthalate compounds; (b) Performing single-path and twin-screw extrusion of said polyamide-polyester mixtures; (c) Spinning said single-path and twin-screw extruded polyamide-polyester mixtures; (d) Performing drawing processes of said single-path and twin screw extruded polyamide-polyester mixtures; and (e) Melting, dissolving and removing sea-phase polyester components from said polyamide-polyester mixtures to form island-phase, polyamide components or super-micro fibers having dimensions between 0.003 and 0.0003 denier per filament.