| 摘要 |
A method for the application of chilled particles such as polytetrafluoroethylene generally marketed under the trade mark "TEFLON-><-, graphite, molybdenum sulfide and boron nitride to a metal surface having crevices or pores therein. With the metal heated to expand the crevices or pores and the particles chilled to contract them, the particles will be locked into the pores when both the metal and the particles come to equilibrium temperature with the particles thereby expanding and the pores contracting. The method is directed to such an application of chilled particles to expanded pores in large metal objects such as for example, large rolls. The large object is rotated on its linear axis while maintained at the desired temperature and the particles are given an electrostatic charge and chilled prior to their application to the metal surface. Apparatus for effecting this application of electrostatically charged chilled particles includes structure for rotating a large metal object about its linear axis, heating the object, and electrostatically charging and chilling particles prior to their application by spraying to pores and crevices in the metal surface. Portable heating and spraying devices are utilized. Each of the heating and spraying devices is adapted to be moved to a position adjacent the object and to be moved away after performance of its function following which the other device may be moved into a position adjacent the object for performance of its function.
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