Ceramic roller for ESA printing and coating
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United States of America Patent
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-
Mar 11, 1997
Issued Date -
N/A
app pub date -
May 3, 1994
filing date -
Nov 9, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electrostatic assist roller (30) for use in a coating, printing or copying machine includes a cylindrical roller core (35), and a ceramic layer (38) formed by plasma spraying a blend of an insulating ceramic material and a semiconductive ceramic material in a ratio which is selected to control the resistance and thickness of the ceramic layer in response to an applied voltage differential. The semiconductive ceramic layer (38) is sealed with a solid, low viscosity sealer (39), such as Carnauba wax, to protect the ceramic layer (38) from moisture penetration. A second ceramic layer (37) may be used to insulate the semiconductive ceramic layer (38) from the core (35).
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