THURSDAY, SEPTEMBER 14, 1995, 8:00 am
SESSION 7: SPECIAL SESSION: ELECTROSTATIC CONSIDERATIONS IN INDUSTRY
Held parallel with Session 6
MODERATOR: D. Swenson, 3M
7.1 EXPLOSIONS AND STATIC ELECTRICITY, N. Jonassen, Technical University of Denmark
The paper deals with the problem of electrostatic discharges as causes of ignition of vapor/gas and dust/gas mixtures. The concepts of explosion limits, the incendiveness of various discharge types, and safe voltages are explained. A series of practical examples of static-caused explosions will be discussed.
7.2 CASE STUDY - ELECTROSTATIC PROBLEMS IN THE GRAPHIC ARTS INDUSTRY, E. Weggeland, Richmond Plastics
Electrostatic problems have a significant cost impact on the vast area of Graphic Arts, which includes photographic film processing to high speed printing presses. Problems range from "shocks" to personnel, machine jams and ink deflection. An understanding of the causes of electrostatic generation will lead to apparent, readily available solutions, and reduced costs of operation.
7.3 ESD - AN EXPLOSIVE SUBJECT? D. Hale, Douglas E. Hale & Associates Pty., Ltd.
Fires and explosions have been attributed to electrostatic discharges in the explosives industry and in some hazardous industrial situations. Strict statutory guidelines often apply, but the phenomenon is often not well understood in many industrial installations. This paper outlines the basic causes of hazardous ESD and proposes corrective action.
7.4 A PLASTIC INDUCED ESD FAILURE, J. Kinnear, IBM Corporation
Plastics have been known to be static generators for quite awhile. In a good ESD program, the use of insulative plastics are kept to a minimum or removed when possible. This presentation describes a case history where a plastic part caused an induced ESD failure. The root causes will be described as well as the fixes that were put in place to correct the problem.
7.5 MACHINE MODEL ESD FAILURE IN A MANUFACTURING ENVIRON-MENT, R. Gibson, Celestica, Inc.
This presentation describes an approach which was used to determine the location of suspected ESD failures within a printed circuit board assembly process. The areas investigated include component failure analysis, component ESD testing, assembly process and part quality investigation as well as ESD process auditing.
7.6 CASE STUDY - EVALUATION OF ESD AS A POTENTIAL IGNITION SOURCE OF PRESSURIZED AIR FORCE MISSILE SHIPPING CONTAINERS DUE TO PACKAGING FOAMS THAT OUTGAS FLAMMABLE BLOWING AGENTS, S. Gerken, USAF
The Air Force ESD Control Technology Center was asked to evaluate ESD as a potential ignition source in support of a mishap investigation involving the explosion of a missile shipping container. Many packaging foams utilize flammable blowing agents such as isobutane during manufacture. Testing was conducted at Newark AFB to determine the possibility of an ESD event igniting the isobutane-oxidant concentration within shipping containers during normal handling and opening procedures.
7.7 CASE STUDY - LARGE PLASTIC WEB ELECTROSTATIC PROBLEMS, RESULTS AND CURE, D. Swenson, 3M Company
Tremendous static charge generation on a plastic web causes unique physical phenomena and special problems. Solution was simple and cost effective.