DocumentCode :
3132857
Title :
Electrostatic powder coating of insulating surfaces using an alternating polarity internal corona gun
Author :
Clements, J. Sidney ; Bair, Richard H., III
Author_Institution :
Dept. of Phys. & Astron., Appalachian State Univ., Boone, NC, USA
Volume :
4
fYear :
1996
fDate :
6-10 Oct 1996
Firstpage :
2017
Abstract :
Electrostatic powder coating has been widely utilized in metal finishing industries for items such as appliances and consumer products. Recently, powder coating has been making inroads in the automotive industry. Here, he authors describe how an internal corona (IC) gun operated at 1 Hz alternating polarity (AP) was used in an attempt to powder coat insulating plastic plates without using conductive primers, metal backings, or ion “backings”. The IC gun was effective in charging the powder particles and emitted very few free ions, but it required frequent cleaning. The Q/M ratios obtained using DC voltage were very good, with negative polarity better than positive. The use of charge separation electrodes verified that the 1 Hz AP gun emitted “waves” of oppositely charged particles. The charged powder average velocity between the gun and the target (3.8 m/s) was calculated from the measured transit time (0.13 s), and was dominated by the airflow
Keywords :
corona; electrostatic devices; electrostatics; manufacturing industries; plastics; spray coating techniques; spray coatings; 0.13 s; 1 Hz; 3.8 m/s; Q/M ratios; alternating polarity internal corona gun; charge separation electrodes; charged powder average velocity; electrostatic powder coating; industrial coating processes; insulating plastic plates; insulating surfaces; powder particle charging; Automotive engineering; Coatings; Consumer products; Electrostatics; Finishing; Home appliances; Insulation; Metal product industries; Metals industry; Powders;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Industry Applications Conference, 1996. Thirty-First IAS Annual Meeting, IAS '96., Conference Record of the 1996 IEEE
Conference_Location :
San Diego, CA
ISSN :
0197-2618
Print_ISBN :
0-7803-3544-9
Type :
conf
DOI :
10.1109/IAS.1996.563851
Filename :
563851
Link To Document :
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