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    Method of producing crimped polypropylene fibers
    121.
    发明授权
    Method of producing crimped polypropylene fibers 失效
    生产聚丙烯纤维的方法

    公开(公告)号：US3577498A

    公开(公告)日：1971-05-04

    申请号：US3577498D

    申请日：1968-10-25

    申请人： TOYO BOSEKI

    发明人： MATSUO TATSUKI ,  NANRI SHOSUKE ,  MASUDA RYUNOSUKE ,  UCHIHASHI HIKOYUKI ,  ISHITOBI KATSUYA

    IPC分类号： D01D4/02 ,  D01D5/08 ,  D01D5/23 ,  D01F6/04 ,  D01D5/22

    CPC分类号： D01D5/23 ,  D01D4/02 ,  D01D5/08 ,  D01F6/06

    摘要： BULKY CRIMPED POLYPROPYLENE FIBERS, THE COIL CRIMPS OF WHICH HAVE A COIL DIAMETER OF E.G. LESS THAN 0.7 MM., AND ARE OF GOOD REPRODUCTIBILITY, ARE MADE BY COOLING OR QUENCHING POLYPROPYLENE FILAMENT, IMMEDIATELY AFTER COMING OUT OF THE SPINNING ORIFICE, ASYMMETRICALLY IN THE CROSS-SECTIONAL DIRECTION OF THE FILAMENT SO AS TO CREATE A CROSSSECTIONAL ANISOTROPY IN THE FILAMENT STRUCTURE, AND THEN STRETCHING THE FILAMENT AND HEAT TREATING THE SAME IN A RELAXED STATE. USE IS MADE OF A SPINNERETTE IN WHICH THE

    MINIMUM DISTANCE BETWEEN THE ORIFICES IS MORE THAN 4.0 MM. COOLING IS EFFECTED BY COOLING GAS UNDER PARTICULAR CONDITIONS OF VELOCITY AND DISTANCE BETWEEN SPINNERETTE FACE AND GAS. THE FIBER IS STRETCHED 2.5 OR MORE TIMES ITS LENGTH AT A PARTICULAR TEMPERATURE SO THAT THE FINE VOIDS ARE DISTRIBUTED ASYMMETRICALLY IN THE CROSS SECTION OF THE FIBER.