公开(公告)号：US3737505A

公开(公告)日：1973-06-05

申请号：US3737505D

申请日：1971-05-28

Applicant: ALLIED CHEM

Inventor： TURNER G ,  SCHUETTLER R ,  VARINA F ,  COLLINGWOOD G

IPC: D01D5/253

CPC classification number: D01D5/253 ,  Y10T428/2931

Abstract: A BIFILAMENT YARN COMPRISING TWO SYMMETRICAL LOBES FUSED SO THAT THE CONCAVE SIDES INTERCEPT AT ANGLE 0 RANGING FROM 10 TO 54*. THE YARN HAS A BROAD CONCAVE AREA AND A NARROW EDGE AREA OF CONVEX SHAPE AND PREEFRABLY A MODIFICATION RATIO OF BETWEEN 1.65 AND 3.0. THIS BIFILAMENT YARN, TEXTURED AND NON-TEXTURED, SEMIDULL AND BRIGHT, WHEN CONVERTED TO PLAIN KNIT HOISERY HAS A LUSTER IN THE RANGE OF 6.6 TO 21 (K/SX100) UNITS. THE TEXTURED AND NON-TEXTURED PLAIN KNIT TEXTILE ARTICLES CONSISTING OF THE BIFILAMENT YARNS OF THIS INVENTION AFTER REPETITIVE ELONGATIONS OF 25 PERCENT HAVE 150-300 PERCENT GREATER WORK OF RECOVERY AND EQUAL IMPROVEMENT IN RESISTANCE TO SAGGING AND WRINKLING THAN OTHER CROSS-SECTIONAL CONFIGURATIONS. THE BIFILAMENT YARNS ARE PREPARED BY MELT SPINNING THERMOPLASTIC HOMOPOLYMERS HAVING A RELATIVE FORMIC ACID VISCOSITY OF 25 TO 90 AT A TEMPERATURE OF 250-280*C. THROUGH TWIN ORIFICES SEPARATED FROM EACH OTHER FOR A DISTANCE OF 0.05 TO 4.0 MILS.