Advertisement
Not a member of Pastebin yet?
Sign Up,
it unlocks many cool features!
- David E. Swenson
- 3M Electrical Specialties Division
- Austin, TX
- OVERVIEW
- Polypropylene film tape manufacturing plant
- S.E. US
- Study in month of August - long, long ago
- Reports of "strange things happening" around flim slitting machine
- Contamination of film web one of the problems reported
- FILM EXTRUSION
- A polypropylene web produced with a width of 21 feet
- Static in this area not reported as a problem - used combination induction and nuclear static elimination devides throughout
- Wide web converted (slit) into "film jumbos" with width of 3 feet to 5 feet for coating with adhesive to make tape
- CLIMATE CONDITIONS
- In the month of August, daytime temperature often over 100°F and R.H. above 95%
- At time of first measurement in this study, early in the morning, the temperature was 80°F and about 75-80% R.H.
- FIELD (VOLTAGE) MEASUREMENTS
- Early in the morning, voltage was impossible to measure with a 200KV@12 inches measurement device from 20 feet away
- Operators of slitting equipment suggested I not get too close for awhile
- SLITTER DESCRIPTION
- [Figure 1]
- OBSERVATIONS:
- Early in the morning, voltage measurements off scale from 20 feet away
- Upon entering "tent" created by web unwind stand, possible to feel static charge.
- When exactly half-way into area, static charge created a "wall" and t was impossible to walk through.
- Observed a fly get caught in the web
- OBSERVATIONS AND REPORTING
- Meeting attended with plant management
- Plant Manager went to area, operators working normally around equipment
- Plant Manager walked through "tent" with no problem, and said "I must be crazy"
- Asked Plant Manager to join me early next morning
- OBSERVATIONS CONTINUED
- Next morning, met Plant Manager at 6:30 and static measurements made - same as previous morning
- Plant Manager entered "tent" area and his curly gray heair straightened.
- He made it half-way and could not continue
- Could not decide if it "should be fixed or sell tickets"
- CORRECTIVE ACTION
- Installed induction static eliminator across web at unwind
- Static immediately reduced throughout process to less than 50KV
- Possible to make measurements in rest of area
- Additional induction units installed at jumbo wind-up areas - <5KV at conclusion
- ------------------------------------------------------------------------
- 17th Annual Electrical Overstress / Electrostatic Discharge Symposium
- September 11-14, 1995 * Hyatt Phoenix Hotel * Phoenix, Arizona
- The seventeenth annual symposium dealing with electrical overstress (EOS)
- and electrostatic discharge (ESD) effects is being sponsored by the ESD
- Association in cooperation with the IEEE. The symposium will be devoted to
- the fundamental understanding of electrical transients and electrical
- overstress, and the application of this knowledge to the solution of
- problems in military, industrial, computing and communication, consumer
- and automotive electrical components as well as in systems, subsystems and
- equipment.
- General Chairman's Invitation
- General Information
- Registration Information
- Schedule of Fees
- Hotel Reservations
- Exhibits
- Seminar and Tutorial Program
- Workshops
- Technical Program
- Symposium Opening And Keynote Address
- Session 1: On-Chip Protection
- Session 2: System-Level ESD
- Session 3: Factory Issues and ESD Training
- Session 4: Device Testing And Protection Circuits
- Session 5: ESD Control Materials and Measurements
- Session 6: Failure Analysis
- Session 7: Electrostatic Considerations In Industry
- Registration Forms
- For further information, please contact the ESD Association:
- ESD Association
- P.O. Box 913,
- Rome, NY 13442-0913
- Phone: (315) 339-6726
- FAX: (315) 339-6793
- [ESD Association logo] [IEEE logo]
- Sponsored by the ESD Association in cooperation with the IEEE
Advertisement
Add Comment
Please, Sign In to add comment
Advertisement