| THE 22nd COATING AND DRYING TECHNOLOGY SEMINAR |
This Seminar is normally offered twice a year, in May and October.
The Coating and Drying Technology Seminar is designed for engineers and scientists who are working with coating and drying of fluids on continuous webs and who wish to become familiar all aspects of coating and drying. It is especially useful for experienced engineerswho wish to learn other areas of coating, and for those relatively new to the field.
For registration and information contact E. B. Gutoff |
A . Introductions & Expectations - Gogolin
B. Fluid Preparation and Delivery - Gutoff
Feed systems
Laminar and turbulent flow
Temperature control for viscosity control
In-line mixers
Flow measurement
Degassing and debubbling
Filtration
Rheology and viscoelasticity
C. Specific Application Methods -
Matching fluids, products, and application methods
Roll coating, forward and reverse
Gravure coating
Knife, rod, blade, and air knife coating
Premetered coaiting (slot and curtain coating)
Slot coating, and slot coating against tensioned web
Slide coating
Curtain coating
E. Impact of Machinery - Kheboian
Photographs of existing equipment
Common terms
Drive-related defects
Common installations problems
Things to check periodically
Types of brakes
F. About Electrostatics - Kisler
What is electrostatics?
Electrostatic fields and forces
Critical electrostatic parameters (resistivity,
surface resistivity, charge distribution,
charge decay, breakdown voltage, electrostatic forces)
G. Substrates and Supports -
Gogolin
Web treatments
H. Surface Forces in Coating - Gutoff
Surface tension
Capillary pressure
Shear and elongation rates
Young-Dupré equation and spreading
Surface energy of the base
Multi-layer coatings and surface tensions
Surface tension-driven defects
Dynamic contact angles
Effects of base roughness and surface energy
I. Process Control - Gogolin
Thickness control
Defect detection
Viscosity control
J. Web Handling - Kheboian
Appendix
Web handling (web attributes, web guiding, web spreaders)
Why use tension control
Ways to control tension: advantages and disadvantages
Tension control methods
Procedure for starting a drive with tension control
Tension controls - unwinde braking;
manual; open loop, closed loop
Tension control - motor driven
Comparison of drive features
L. Limits of Coatability in Slot, Slide, and curtain Coating - Gutoff
High and low flow limits
Slide coating limits
Slot coating limits
Curtain coating limits
M. Process Scale-up - Gogolin
R&D to production
N. Electrostatics Control Systems for Coating - Kisler
AC and DC electrostatic bars
Ionized air generators
Stainless steel brushes
New techniques to create an electrostatic field
Electrostatic assist in coating
Electrostatic assist in powder coating
Electroassist in drying
O. Troubleshooting Coating Defects - Gutoff
Troubleshooting procedure
Diagnostic tools
Defects catalogue
P. Lamination - Gogolin
Care of rubber rolls
Q . Winding and Unwinding - Kheboian
Winding a good roll
Types of unwinds and winders
Photos of unwinds and winders
Splicing techniques
Measuring roll hardness<
Defect Nomenclature
What causes electrostatic defects
How to maintain electrostatic eliminators in working order
How to eliminate damge to equipment caused by discharge
Leveling effect
S. Internal Die Design for Uniform Flow - Gutoff
Machining tolerances for a fixed die
Fixed versus adjustable dies
Cleanliness, deckling, and cleaning
Electrostatic web cleaning systems
Web corona treatment systems
U. Drying of Coatings -Gutoff
Purpose, methods, and equipment
Constant and falling rate drying
Modelling drying
Infra-red heating
Gap dryer
Drying defects
V. Slitting - Kheboian
Slitting systems
Review of constant torque vs. constant tension
Basic elements of shear slitting
Modern pneumatic differential winder shafts
Modern pneumatic slitter shafts
W. Drying Equipment and Operation - Gogolin
Objectives and critical parameters of luid and oven
Air flow configurations
Web temperature profiles
Types of dryers and oven configurations
Cooling webs
Environmental concerns
Ultraviolet and electron beam curing techniques
Conditions for explosions
Charges on the human body
How to handle solvent materials
Demonstrations
Bibliography
Recommendations
Y. Coating Defects - Gutoff
Chatter, ribbing, and cascade
Waves in slide and curtain coating
Extrusion coating defects
Streaks and bands
Neck-in, scalloped edges, and edge beads
Point defects
Diffusion between layers
Coverage non-uniformities
Z.
Selection of motor horsepower
General specifications and web handling
Solving problems of drive systems
Transient analysis of speed and load
Pattern recognition
Typical malfunctions
Using signature patterns to solve problems
Summary of Comments and Review of
| INSTRUCTORS |
| Besides Edgar B. Gutoff, the instructors include: |
 E. Lawrence Gogolin, Technical Consultant in the process, chemical, and coating areas; developer of coating application methods and processes for manufacturing |
| Gerald I. Kheboian, consultant on web transport systems; has over 45 years experience on web handling, drives, tension controls, and machine controls. Former Polaroid Technical Manager. |
| Dr. Semyon Kisler, President of Electrostatic Science and Technology, a consulting and new development company; is the author of 34 patents and 89 articles, and former Director of Polaroid's Electrostatic Control System Lab. |
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Last Update:7/27/10