Coated filament | Article about coated filament by The Free Dictionary
coated filament[′kōd·əd ′fil·ə·mənt]
A vacuum-tube filament coated with metal oxides to provide increased electron emission.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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This prevents "dancing fibers" and "hairiness" which reduces interruption of the continuous sizing film resulting in properly coated filaments