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    • 1. 发明授权
    • Method of producing inflation film, apparatus therefor and molded
articles thereof
    • 吹塑薄膜的制造方法及其制造方法及其成型体
    • US6007760A
    • 1999-12-28
    • US742999
    • 1996-11-01
    • Takeshi ShirakiIwatoshi Suzuki
    • Takeshi ShirakiIwatoshi Suzuki
    • B29C47/24B29C47/28B29C47/50B29C55/28B29K23/00B29L7/00C08F110/00C08F110/02B29C47/20
    • B29C47/28B29C47/0026B29C47/24B29C47/366B29C47/38B29C47/20
    • A method of producing an inflation film which includes the steps of melting an ultra-high-molecular-weight polyolefin in an extruder, extruding the molten polyolefin from a screw die, and blowing a gas into a molten tubular film formed by extrusion. An apparatus for producing an inflation film which includes an extruder provided with a first screw, and a screw die having an L/D of at least 5 and is provided at the end of the extruder, wherein the screw die includes a second screw which rotates independently of the first screw, a mandrel coupled to the end of the second screw and rotates together with the second screw, an outer tube die in which the mandrel is inserted, and a gas passage extending in the second screw and in the mandrel. An inflation film is composed of an ultra-high-molecular-weight polyolefin having a tensile strength at break of greater than 1660 kg/cm.sup.2 in a machine direction and greater than 1600 kg/cm.sup.2 in a transverse direction, an impact strength of greater than 9500 kg.multidot.cm/cm, a thickness of from 10 to 1000 .mu.m, an R-value of not larger than 10 .mu.m and an intrinsic viscosity (.eta.) of at least 7 dl/g.
    • 一种膨胀膜的制造方法,其包括在挤出机中熔融超高分子量聚烯烃的步骤,从螺杆模头挤出熔融聚烯烃,并将气体吹入通过挤出形成的熔融管状膜中。 一种吹塑薄膜的制造装置,其特征在于,具备设置有第一螺杆的挤出机和L / D为5以上的螺杆,设在所述挤出机的端部,所述螺杆具有旋转的第二螺杆 独立于第一螺杆,与第二螺杆的端部相连的心轴与第二螺杆一起旋转,插入心轴的外管模,以及在第二螺钉和心轴中延伸的气体通道。 膨胀膜由机械方向的断裂强度大于1660kg / cm 2,横向大于1600kg / cm 2的超高分子量聚烯烃构成,冲击强度大于 9500kgxcm / cm,厚度为10〜1000μm,R值为10μm以下,特性粘度(η)为7dl / g以上。