发明公开
EP1068905A1 Process for application of a fluoropolymer coating to a threaded fastener
有权
一种用于在螺纹紧固件制备涂层处理含氟聚合物的
- 专利标题: Process for application of a fluoropolymer coating to a threaded fastener
- 专利标题(中): 一种用于在螺纹紧固件制备涂层处理含氟聚合物的
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申请号: EP00201165.8申请日: 2000-03-31
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公开(公告)号: EP1068905A1公开(公告)日: 2001-01-17
- 发明人: Duffy, Richard J. , Sessa, Eugene D.
- 申请人: Nylok Fastener Corporation
- 申请人地址: 15260 Hallmark Drive Macomb, Michigan 48042 US
- 专利权人: Nylok Fastener Corporation
- 当前专利权人: Nylok Fastener Corporation
- 当前专利权人地址: 15260 Hallmark Drive Macomb, Michigan 48042 US
- 代理机构: Casey, Lindsay Joseph
- 优先权: US352431 19990713
- 主分类号: B05B5/08
- IPC分类号: B05B5/08 ; B05D3/02
摘要:
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 (10) in powder form and is subjected to a triboelectrostatic charging process so that individual particles discharged from the spray nozzle are electrically charged. 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 pre-selected 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.
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