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KHUDKIBOOK
OFFSET PRINTING PROCESS
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DI03058031
Code: DI03058031
Credits: 4
Semester 3
PT
Offset Printing Process
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Follow on Instagram for UpdatesOffset Printing Process Syllabus — Unit-wise Content
The official GTU curriculum for Offset Printing Process (subject code DI03058031) as prescribed for PT · Semester 3 divides the course into 7 units, covering 43 listed topics. The unit-wise breakdown below is read from the GTU syllabus document for this subject code, so you can check what the course actually covers before deciding which papers to attempt.
Download the official syllabus PDF (DI03058031)Unit 1 Sheet fed offset machine
- 1.1. Lithographic offset – working principle, Invention and history of offset machine.
- 1.2. Development of offset machine
- 1.3. Construction of sheet fed offset press
- 1.4. Categories of sheet fed press
- 1.5. Advantages and limitations of offset machine
- 1.6. Applications of offset machine,
- 1.7. Comparison with other printing processes,
- 1.8. Configurations of sheetfed machines: single color, multi color, perfecting press, satellite press, CIC
Unit 2 Feeding unit
- 2.1. Function of feeder
- 2.2. Feeder cycle
- 2.3. Feeder types – manual feeder, automatic feeder, single sheet feeder and stream feeder, continuous feeder, friction feeder, pneumatic feeder
- 2.4. Working components of feeding unit – pile height governor, Pile board, feed board (Ram board), sheet separation, sheet lifting, sheet forwarding, conveying board, sheet control mechanism on feed board, sheet register, two sheet detector, no sheet detector, front / back separation, sheet insertion and transfer, side lay and types, front lay, gripper
Unit 3 Dampening unit
- 3.1. Characteristics of dampening system
- 3.2. Image and non image area of plate
- 3.3. Retention of plate relative selectivity
- 3.4. Fountain solution: water, acid, wetting agents or surfactants, plate conditioners, gum Arabic,
- 3.5. Parameter for fountain solution: pH, conductivity, hardness of water, Role of alcohol, factor affecting the amount of fountain solution
- 3.6. Construction and working of dampening system, Rollers in dampening system: form roller, pan roller, doctor roller, vibrator roller,
- 3.7. Covering of dampening roller: stockiniette cloth, molleton cloth, paper covering, synthetic covering,
- 3.8. Setting of roller, desensitizing the metal roller
- 3.9. Types of dampening system – Conventional, direct and
- 06. 12 GUJARAT TECHNOLOGICAL UNIVERSITY Program Name: Engineering Level: Diploma Branch: Printing Technology Course / Subject Code : DI03058031 Course / Subject Name : Offset Printing Process w.e.f. 2024-25 http://syllabus.gtu.ac.in/ Page 3 of 9 indirect dampening system, continuous dampening system, the dampen orr system, brush system, flapper system, air mist system, dahlgren system, micro flow system, alcohol system, inker feed. Care and maintenance of dampening system
Unit 4 Inking unit
- 4.1. Role and functions of inking system, theory of ink flow and factors affecting it, ink-water balance,
- 4.2. Parts of inking system: fountain section – fountain blade, ink keys, ink agitator, split duct, fountain roller, doctor roller, distribution section – vibrator, distributors, riders, from roller section – form roller, hickie pickers, form roller setting
- 4.3. Inking system – central drum system, multiroll inking system, underneath inking system, drum inking system
- 4.4. Different inking rollers: synthetic rubber rollers, polyurethane rollers, davis process rollers, natural rubber rollers, vulcanized oil rollers, PVC rollers,
- 4.5. Care and maintenance of inking system, shore hardness, working and types, required properties and storage conditions, ink film thickness
Unit 5 Printing unit
- 5.1. Plate cylinder: bolting clamp, cam clamp, detachable clamp, cylinder gears, cylinder gears, cylinder gap
- 5.2. Blanket cylinder: bearers, bearer pressure, undercut
- 5.3. Blanket types, construction of blanket, characteristics of blanket, features of blanket, blanket selection, packing, storage and handling,
- 5.4. Impression cylinder: cylinder packing, patching, image enlargement, image reduction, printing pressure, cylinder setting theory, cylinder balancing, bearer to bearer adjustment
- 5.5. Transfer cylinder, sheet transfer, sheet delivery, short and extended carriers, sheet control devices, anti set off spray powder
Unit 6 Troubleshooting
- 6.1. Catching up, color too weak, dot gain, fading, grey and weak solids muddy half tones, plate blinding, plate wear, scumming, double image, trapping
- 6.2. Embossing, misregister, mottle, piling, plate wear, slurring, double image,
- 6.3. Dot gain, distribution, ink water balance, misting,
- 08. 16 GUJARAT TECHNOLOGICAL UNIVERSITY Program Name: Engineering Level: Diploma Branch: Printing Technology Course / Subject Code : DI03058031 Course / Subject Name : Offset Printing Process w.e.f. 2024-25 http://syllabus.gtu.ac.in/ Page 4 of 9 misregister, mottle, muddy halftones, picking or linting, piling, plate wear, roller stripping, slurring, double image, tinting or toning,
- 6.4. Catching up, chalking, color too weak, color variation, dot gain, drying, gloss, grey and week solids, ink water balance, mottle, muddy halftones, picking or linting, plate blinding, roller stripping, rub off or scuffing, scumming, tinting, toning,
- 6.5. Chalking, color variation, drying, ghosting, gloss, hickies, mileage, misregister, mottle, picking or linting, piling, rub off or scuffing, double image, tinting or toning,
- 6.6. Backing, blocking, catching up, chalking, color too weak, color variation, crystallization, dot gain, distribution, drying, embossing, fading, ghosting, gloss, grey and weak solids, hickies, ink water balance, mileage, misting, misregister, mottle, muddy half tones, picking or linting, piling, plate blinding, roller stripping, rub off or scuffing, scumming, set off or blocking, tinting or tonning, trapping
Unit 7 Sustainable development in offset printing
- 7.1. Different sustainable development in offset industry like reduced power consumption, newly developed drying system, less wastage, short make ready time, less man power, increase productivity,
- 7.2. Ink wash up system and its disposal
- 7.3. Green fountain solution and ink
- 7.4. Renewable resources in printing press
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