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    • 6. 发明授权
    • Method of making expanded polytetrafluoroethylene products
    • 制造膨胀聚四氟乙烯产品的方法
    • US06203735B1
    • 2001-03-20
    • US08792780
    • 1997-02-03
    • Tarun J. EdwinScott Randall
    • Tarun J. EdwinScott Randall
    • B29C6902
    • A61F2/06A61F2/07A61F2002/061A61F2002/065A61F2002/075B29C55/26B29C61/025B29K2027/18B29L2031/7534
    • A method of shaping three-dimensional products by manipulating an expanded polytetrafluoroethylene tubular body into a desired three-dimensional conformation. The present invention entails radially expanding a longitudinally expanded polytetrafluoroethylene (ePTFE) tube to form a radially expanded ePTFE (rePTFE) tube, engaging the rePTFE tube circumferentially about a shaping mandrel, heating the assembly to a temperature below the crystalline melt point temperature, or sintering temperature, of polytetrafluoroethylene to radially shrink the diameter of the rePTFE tube into intimate contact with the shaping mandrel, and heating the assembly to a temperature above the crystalline melt point temperature of polytetrafluoroethylene to amorphously lock the microstructure of the shaped polytetrafluoroethylene body.
    • 通过将膨胀的聚四氟乙烯管体操纵成所需的三维构象来形成三维产品的方法。 本发明需要径向膨胀纵向膨胀的聚四氟乙烯(ePTFE)管,以形成径向膨胀的ePTFE(rePTFE)管,其在成形心轴周围接合rePTFE管,将组件加热到低于结晶熔点温度的温度,或烧结 聚四氟乙烯的温度以径向收缩rePTFE管的直径与成形心轴紧密接触,并将组件加热到高于聚四氟乙烯的结晶熔点温度的温度,以非晶态地锁定成形聚四氟乙烯体的微观结构。