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    • 1. 发明授权
    • Polymer melting and extruding apparatus with linear downstream threads
    • 具有线性下游丝的聚合物熔融挤出设备
    • US06454454B1
    • 2002-09-24
    • US09614180
    • 2000-07-11
    • Robert A. Barr
    • Robert A. Barr
    • B29B742
    • B29C47/361B29C47/0009B29C47/60B29C47/6006B29C47/6012B29C47/6043B29C47/6075B29C47/627
    • An extruder screw mechanism has a barrel that is heated by heating coils, an internal screw, and a cylindrical melt sleeve having a plurality of circumferentially spaced, axially extending, radial slots there through located between the external barrel and the internal screw. Another embodiment of the extruder has a barrel and an internal screw, with the internal screw having either a single central axial bore or a plurality of internal axial bores. The internal screw is provided with a plurality of external threads, with the threads each having a curved starting portion with a helix angle that has a finite value and gradually increases along an initial portion of the screw until the threads are substantially linear and parallel to the axis of the screw along the melting portion of the screw; a related embodiment has threadless portion separating the linear threads from the curved upstream threads. Circumferentially spaced, axially extending, radial slots extend from the outer surface of the screw along the melt section portion of the screw radially inwardly to an associated axial bore for removing melted polymer as it forms between solid polymer and a heated surface.
    • 挤出机螺杆机构具有通过加热线圈加热的筒体,内螺纹和圆柱形熔融套筒,其具有位于外筒和内螺钉之间的多个周向间隔开的轴向延伸的径向狭槽。 挤出机的另一实施例具有筒体和内螺纹,内螺纹具有单个中心轴向孔或多个内部轴向孔。 内螺纹设置有多个外螺纹,螺纹各自具有弯曲起始部分,螺旋角度具有有限值,并且沿螺杆的初始部分逐渐增加,直到螺纹基本上线性并平行于螺纹 沿着螺杆的熔化部分的螺杆的轴线; 相关实施例具有将线性螺纹与弯曲的上游螺纹分离的无螺纹部分。 周向间隔开的轴向延伸的径向狭槽从螺杆的外表面沿着螺杆的熔体部分径向向内延伸到相关联的轴向孔,用于在固体聚合物和加热表面之间形成时除去熔融的聚合物。