2. Definition of Release Coat
What is a “release coat?”…..A
coat/coating that will relieve,
liberate, release, or free (as from
restraint) when desired/ required.
3. Release Coat Schematic
Release Coat
Substrate: Treated(Corona/chemical/primer)
Roll of tape Adhesive
8. Types of Release Coat
Type Acrylate Carbamate Silicone
Release 1.0-1.5N/c 0.1-0.7N/c 0.01-0.1N/c
Level
9-21 oz/in 1-6.5 oz/in 0.1-1 oz/in
Chemical
Fluorochemical PVODC Silicone
Name
9. Types of Application
Engraved Cylinder (rotogravure)
Meyer Rod
Reverse Doctor Blade
Flexo
Need treatment (corona/chemical/primer)
10. Curing/Drying
Must dry web of solvent or water
Reach a temperature to remove fully the
solvent or water
Most release coats must also reach a specific
temperature to set, or film form
Web temperature/not air temperature
Assure the drying oven is free of obstructions
11. Film Forming Temperatures
Release Coat Temp., C Temp., F
Polyurethane 100 212
Ure-Acrylic Dry of water Dry of water
PET/Acrylic 100 212
Vinylacetate/acrylic 145 300
Polysaccharid Dry of water Dry of water
12. Film Forming Temperatures
Release Coat Temp., C Temp., F
Fluorpolymer, RA-110W 138 280
Fluorpolymer, RA-120W Dry of water Dry of water
PVODC 80-92 176-196
PVSC >80 >176
PEIODC Approx. 90 Approx. 190
13. General Properties of Release Coats
Liquid vs Powder
Water-blended vs Solvent-blended
A specific level of release, i.e. N/cm or Oz/in
Any FDA requirements
Long shelf life
Aging at elevated temperature & humidity
15. Carbamate Release Coat Chemistry
OH
CH2–CH–CH2–CH n
CH2–CH + C18H35N=C=O O –C–N–C18H35
OH n O H
H
Polyvinyl Octadecyl
Alcohol Isocyanate Polyvinyl
Octadecyl Carbamate
16. Carbamate Release Coat Chemistry
OH
CH2–CH–CH2–CH n
CH2–CH C18H37N=C=O
+ O –C–N–C18/16H35
OH n C16H37N=C=O
O H
H
Polyvinyl Octadecyl Isocyanate
Alcohol Hexadecylisocyanate Polyvinyl
Stearyl Carbamate
20. Temperature Cloud Point vs. Solvent
0.3 0.5 0.7 1 1.5
Release Coat Solution % Solids
100% Toluene 15% Toluene/85% Heptane
21. Release Coat Weight vs.% Maximum Release
Proper Film Forming Temperature Reached
100%
% Maximum Release
80%
60%
40%
20%
0%
0.1 0.2 0.5 1 1.5 2 3
% Solids Release Coat
22. Coat Weight vs. Maximum Release
Proper Film Forming Temperature NOT Reached
% Maximum Release
100
80
60
40
20
0
0.1 0.2 0.5 1 1.5 2 3
% Solids Release Coat
23. Release Coat Use Questions
Oven Drying Capabilites (What web temp.
can be obtained?)
Recirculation equipment
Temperature requirements
Printable or not (What kinds of inks or with
pencil/pen?)
Foaming issues (with water based)
25. Water-Based Release Coat
Relative Release Values
A ll S ilic o n e Vin yla c e t a t e / a c rylic Ure t h a n e - A c rylic A c rylic
700
600
Pull Strength Value
500
400
300
200
100
0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Relative Amount of Release
26. Water-Based Release Coat
Relative Release Values
Vin yla c e t a t e / a c rylic Ure th a n e - A c rylic
700
Pull Strength Value
600
RA-130W
500
400
Escoat WFX 120
300
Escoat WPM80
200
100
0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Relative Amount of Release
