Name of the University : Jadavpur University
Department : Printing Engineering
Degree : B.E
Subject Code/Name : Flexo And Gravure
Sem : II
Website : jaduniv.edu.in
Document Type : Model Question Paper
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/dspace.jdvu.ac.in/5405-B.%20Printing%20Engg.%20-%20Flexo%20and%20Gravure.pdf
Flexo & Gravure Question Paper :
B. Printing Engg. Part-I Examination, 2008 :
( 2nd Semester )
Time : Three hours
Related : Jadavpur University Standardization in Printing and Packaging M.Tech Question Paper : www.pdfquestion.in/5404.html
Full Marks : 100
Answer question no. 7 and any two from each group. :
GROUP–A :
1. (a) Why flexography is called aniline printing? 2
(b) Write the basic principle of flexographic printing and briefly discuss the main parts of a flexographic printing unit. 2+8=10
(c) Which types of substrates are suitable for flexographic printing? 3
(d) What are the advantages of flexography? 5
2. (a) Draw a neat diagram showing the physical parts of a flexographic printing plate and explain each term. 6
(b) How the floxographic plates are made by using rubber and sheet polymer? Make a distinction between them. 14
3. (a) Briefly state different designs of a flexographic press with supporting diagram and make a comparison among them. 9
(b) Compare between the pyramid and the quadrangular cell structure of an anilox roll. 3
(c) Distinguish between various types of flexographic inks stating their merits and demerits. 8
GROUP-B :
4. (a) Which types of base materials and surface materials are used in gravure cylinders? 3+2=5
(b) What are the causes and remedies of following imbalances in gravure cylinders?
(i) Static Imbalance. 3
(ii) Dynamic Imbalance. 3
(c) What criterions must a film positive meet for gravure cylinder making? 3
(d) Which substrates are generally suitable for gravure printing? 3
(e) How the surface treatment is done on film surface in gravure printing? 3
5. In how many ways gravure cylinders are prepared? Describe each process in the light of their merits and demerits and also draw the diagrams of different opening and depth of cells. 2+18=20
6. (a) Mention the necessary features of a doctor’s blade used in gravure printing. 4
(b) How higher pressure of gravure impression roller affects the gravure printing? 3
(c) Discuss briefly the factors which influence drying in a gravure printing unit. 6
(d) Which properties a gravure ink must possess? 3
(e) Mention various ingredients of gravure ink. 4
7. Write short notes on any four : 4×5=20
(a) Ghosting and Adhesion in Flexography.
(b) Strike through and Trapping in Flexography.
(c) Streaking and colour strength in Gravure.
(d) Crawling and drying in Gravure.
(e) Pigment settlement and pin hole appearance in Gravure.
Syllabus :
Flexo And Gravure :
Flexographic principle, Flexographic printing surfaces and generation and their materials and processes. Inking system, Ink composition, Flexographic presses, Floxographic printing problems.
Gravure principle, Gravure cylinder making processes and materials used, Gravure ink and their properties, Gravure presses, Gravure printing problems, use of these processes in packaging industry, Trends and the future.
References :
** Flexography primer, GATF
** Kasunich Cheryl L., Gravure primer, GATF
** Adams J. Michael, Faux D. David, Rieber J. Lloyd, Printing Technology, Delmar Publishers
** Eldred Nelson R., Chemistry for the Graphic Arts, GATF
** Eldred Nelson R. & Scarlett Terry, What the Printer should know about Ink, GATF
Flexo And Gravure Laboratory :
1. Preparation of flexographic stereo
2. Preparation of Gravure cylinder
3. Study of different parts of the flexographic machine
4. Study of different parts of the gravure machine
5. Setting different parts of the machines
6. Printing on different types of substrate
7. Study of different running on problems and trouble shooting
8. Machine maintenance