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Course: Press Work -
Gravure 
Code: 505 |
Teaching Scheme
hrs/week |
Examination Scheme |
Theory |
Practical |
Theory
Marks |
Duration |
UT Marks |
Pr. Marks |
TW Marks |
3 |
4 |
80 |
3 hrs. |
20 |
30 |
20 |
Rationale:
The Gravure process is particularly important for packaging
applications. The course deals with detailed study of all the
variables of the gravure process so that when a student enters
this field, he has an introductory level knowledge of the process.
| Lesson
No 1: Introduction
Theory.
|
Marks |
Hours |
1.1 |
Brief idea of process, image carrier.
|
3 |
2 |
2.2 |
Image processing for gravure process - Different types
of originals, films for Gravure, Comparison with Offset,
need for special colours, trapping & related variables.
|
4 |
3 |
| Lesson
No 2: Cylinder materials & variables
Theory.
|
Marks |
Hours |
2.1 |
Copper – properties, finishing, cutting, removal,
testing, corrections, nickel plating.
|
5 |
4 |
2.2 |
Electroplating - chemical & electrical variables
such as electrolytes, immersion, current, voltage, temperature,
distance.
|
4 |
3 |
2.3 |
Chromium – plating, finishing, degreasing, polishing,
testing,
corrections.
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2 |
2.4 |
Cylinder base – sleeve, integral shaft, specifications,
balancing
methods.
|
3 |
2 |
2.5 |
Cylinder correction methods.
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-- |
1 |
2.6 |
Automation & environmental aspects.
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-- |
-- |
| Lesson
No 3: Engraving methods
Theory.
|
Marks |
Hours |
3.1 |
Chemical engraving – cell configurations, different
etching processes, merits, demerits, conventional gravure
– carbon tissue, coating.
|
2 |
4 |
3.2 |
Electronic engraving – screen angles, cell size,
cell walls, engraving
speeds, cylinder sizes, cutting tool, ink &
substrate considerations.
|
5 |
3 |
3.3 |
Electronic beam & Laser engraving
|
3 |
2 |
| Lesson
No 4: Substrates
Theory.
|
Marks |
Hours |
4.1 |
Properties
|
2 |
1 |
4.2 |
Types-absorbent, non-absorbent
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2 |
1 |
4.3 |
Applications
|
1 |
-- |
4.4 |
Static electricity problems
|
2 |
1 |
| Lesson
No 5:
Theory.
|
Marks |
Hours |
5.1 |
Doctor blade –
a) Assembly- angle, force, deflection, causes of wear
b) Materials
c) Holder configurations- wiping & contact angles,
pressure control
d) Setting, Make-ready & Lubrication
e) Problems
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5.2 |
Impression roller –
a) Functions, materials & hardness
b) Configurations – pressure, conductivity, balance,
deflection & compensation
c) Environmental control in gravure press-room, storage
of rollers.
d) Setting & effects on web tension
e) Problems
f) Electrostatic assist
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5.3 |
Gravure proofing machines
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3 |
2 |
| Lesson
No 6: Inks for gravure
Theory.
|
Marks |
Hours |
6.1 |
Composition
|
2 |
1 |
6.2 |
Classification
|
2 |
1 |
6.3 |
Properties
|
2 |
1 |
6.4 |
Solvents, Toxicity, Viscosity, Temperature
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0 |
3 |
6.5 |
Ink fountain & transfer
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2 |
1 |
| Lesson
No 7: Issues related to Gravure Printing
Theory.
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Marks |
Hours |
7.1 |
Problems encountered in Gravure process, their causes
& remedies
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3 |
1 |
7.2 |
Identification of Gravure print.
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1 |
Practical
Introduction to different parts of gravure machine & their
working
Setting of feeding unit
Setting of printing unit- doctor blade assembly, impression roller,
registration control
Setting of delivery unit
Preparation of gravure cylinder preparation by various methods-
demonstrations
Study of gravure cylinder proofing machine
Reference books:
1.Gravure Primer- GATF
2.Gravure process technology- GAA
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