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    • 9. 发明授权
    • Process for application of a fluoropolymer coating to a threaded fastener
    • 将含氟聚合物涂层应用于螺纹紧固件的方法
    • US06395346B1
    • 2002-05-28
    • US09686010
    • 2000-10-10
    • Richard J. DuffyEugene D. Sessa
    • Richard J. DuffyEugene D. Sessa
    • B05D106
    • B05D1/06B05B5/047B05B13/0242B05B14/10B05C9/14B05D3/042B05D5/083B05D7/14B05D2258/02B05D2506/10
    • The present invention is directed to a process for the application of fluoropolymer to a preselected area of a threaded fastener, and particularly to substantially all of the threads of the fastener. The fluoropolymer is supplied to a spray nozzle in powder form and is subjected to a triboelectrostatic charging process so that individual particles discharged from the spray nozzle are electrically charged to between about 1×10−7 to about 3×10−3 coulombs per kilogram. In the preferred form of the invention, the fluoropolymer powder is triboelectrically charged, entrained in an air stream discharged from the nozzle and directed onto the preselected area of the fastener. In this manner a generally uniform powder coating is deposited onto the preselected area of the fastener while the fastener is maintained at room temperature. Thereafter, the fastener is heated to a temperature above the melting point of the fluoropolymer to thereby coalesce the deposited powder into a continuous film coating which adheres, upon cooling, to the preselected area of the fastener. In accordance with a preferred embodiment, the fastener is heated in a manner which raises the temperature of only the preselected area of the fastener to the fluoropolymer melting point. This preferred heating technique minimizes the retention of fluoropolymer inadvertently deposited on areas of the fastener other than the preselected area, and allows this undesired fluoropolymer to be easily removed, even after heating.
    • 本发明涉及将氟聚合物应用于螺纹紧固件的预选区域,特别是基本上所有紧固件的螺纹的方法。 氟聚合物以粉末形式供应到喷嘴,并进行摩擦静电充电过程,使得从喷嘴排出的单个颗粒充电至约1×10 -7至约3×10 -3库仑/千克。 在本发明的优选形式中,含氟聚合物粉末被摩擦带电,夹带在从喷嘴排出的空气流中并引导到紧固件的预选区域。 以这种方式,当紧固件保持在室温下时,将大致均匀的粉末涂层沉积到紧固件的预选区域上。 此后,将紧固件加热到高于含氟聚合物的熔点的温度,从而将沉积的粉末聚结成连续的膜涂层,其在冷却时粘附到紧固件的预选区域。 根据优选实施例,紧固件以将仅紧固件的预选区域的温度升高到含氟聚合物熔点的方式被加热。 这种优选的加热技术使得聚合物无意地沉积在除了预选区域之外的紧固件的区域上的保留最小化,并且即使在加热之后也允许这种不需要的含氟聚合物被容易地去除。