HIGH TENACITY, HIGH MODULUS POLYAMIDE YARN AND PROCESS FOR MAKING SAME

HIGH TENACITY, HIGH MODULUS POLYAMIDE YARN AND PROCESS FOR MAKING SAME

A yarn comprised of a polyamide which is at least about 85% poly(hexamethylene adipamide) or poly( epsilon -caproamide) is disclosed which has a relative viscosity of greater than about 50, a tenacity of greater than about 11.0 g/d, a dry heat shrinkage at 160 DEG C of not more than about 6.5 percen...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: THOMAS RUSSELL CLARK III, JOSEPH ARNOLD COFER JR
Format: Patent
Sprache:eng
Schlagworte:
APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS
CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS
FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS,ROPES OR THE LIKE
MECHANICAL FINISHING OF YARNS OR ROPES
MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OFARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES ORRIBBONS
NATURAL OR ARTIFICIAL THREADS OR FIBRES
SPINNING
TEXTILES
WARPING OR BEAMING
YARNS
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Beschreibung
Zusammenfassung:A yarn comprised of a polyamide which is at least about 85% poly(hexamethylene adipamide) or poly( epsilon -caproamide) is disclosed which has a relative viscosity of greater than about 50, a tenacity of greater than about 11.0 g/d, a dry heat shrinkage at 160 DEG C of not more than about 6.5 percent, a boil-off shrinkage of less than about 7%, a modulus of greater than about 35 g/d, a birefringence of greater than about 0.060, a differential birefringence D: DELTA .90-.00, of greater than 0, and a sonic modulus of greater than about 90 g/d. The process for making the yarn includes drawing of a feed yarn while heating to at least about 185 DEG C in at least a final draw stage to a draw tension of at least 3.8 g/d, subsequently decreasing the tension while heating to at least about 185 DEG C to produce a length decrease of between about 2 and about 13.5, and cooling and packaging the yarn.