Process and apparatus for applying chilled electrostatically charged particles to the surface of a large metal article

Abstract From the Canadian patent

The process described herein comprises the application of chilled particles such as polytetrafluoroethylene generally marketed under the trade mark "TEFLON" graphite, molybdenum, sulfite, boron nitride etc. 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 process described herein is directed to such an application of chilled particles to expanded pores in large metal objects such as for example, large rolls. The …