Name of the University : Jadavpur University
Department : Printing Engineering
Degree : B.E
Subject Code/Name : Ink Technology
Year/Sem : III/II
Website : jaduniv.edu.in
Document Type : Model Question Paper
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/dspace.jdvu.ac.in/5413-B.%20Print%20Engg.%20Ink%20Technology.pdf
Ink Technology Question Paper :
Bachelor Of Printing Engineering Examination, 2009 :
Time : Three hours
Full Marks: 100
Related : Jadavpur University Packaging Techniques B.E Question Paper : www.pdfquestion.in/5412.html
Answer any five questions. :
1. Differentiate between (any five): – 5×4
(a) Pigment and Dye stuff
(b) Drying time and Setting time
(c) Liquid ink and Paste ink
(d) Cold set and Quickset drying
(e) Drying oil and Mineral oil
(f) Heatset and Quickset drying
2. a) What are the factors that determine the choice of solvent in ink? Classify solvents with one example each 8
(b) What happens when rosin is heated with an oil reactive pure phenolic resin at 150 degree C
(c) Define iodine value of an oil. Based on Iodine value how oils are classified? Which classes of oils are generally used to make paste ink? – 4
(d) Write down the function of resin. What are the advantages of synthetic resin over natural resins? – 4
3. (a) What are the stages through which a printing ink is manufactured? 2
(b) Briefly describe a Microflow mill. , 2
(c) What are the advantages of -roll mill? 4
(d) Write down the advantages and disadvantages of Ball mill. 4
(e) Describe briefly a typical cooking cycle that takes place during the manufacture of high gloss varnish used in a lithographic ink. 8
4. (a) Write down the advantages of UV curing system. – 4
(b) Why short wave IR is preferred for letterpress and lithographic ink curing system but not for flexography? – – 3
(c) Write down the advantages of IR curing system. 4
(d) Why longer wavelength of Infrared is not generally used in IR curing system? 3
(e) Write about vegetable oil based black inks used in coldest web offset. 3
(f) Briefly describe oxidation drying mechanism. 3
5. (a) What are the ink properties that are affected by particle size of pigment? How particle size of pigment can be measured? 4
(b) Describe how press performance test of oil ink is done? 6
(c) How the melting range of resin can be measured? 5
(d) Define drying time. What are the factors which affects drying time? 5
6. (a) Why flexographic and gravure inks are supplied at a higher viscosity than required for the press by the ink makers? .
(b) Why dilatants inks are not suitable for letterpress and offset process?
(c) What is set off problem? What are factors which influence set off?
(d) What is picking problem and how it occurs? ink? Describe the functions of wetting agents, stiffening agents and antiskinning agents. – 5
7. (a) What is paste ink? Why is it used in lithography and letterpress printing? 5
(b) Briefly describe thixotropy phenomenon of ink. 5
(c) Write down the physical characteristics of resins and their influence on printing ink. 10
8. Write short notes on: (any five) 5×4
(a) Cavitation mixer
(b) Fugitive ink
(c) Continuous inkjet inks
(d) Disperse dyes
(e) Plasticizer
(f) Scumming
(g) Chillroller marking
Syllabus :
Ink Technology :
Nature of printing ink – visual characteristics, drying characteristics, adhesive nature, resistance properties. Raw materials of printing inks: Pigments and dyestuffs, oils, solvents, resin, plasticisers, driers, waxes, surfactants, antioxidants and other additives, Letterpress inks.
Lithographic inks, Flexographic inks, Gravure inks, Screen inks – General characteristics, Physical properties, drying mechanism, formulation, inks for specific end-use application (ink for different types of plastics, paper, metallic ink, fluorescent inks, stamp inks), ink related problems and possible solutions, fugitive ink.
Future trends. Radiation curable systems – Infra-red curing, ultra-violet curing, micro-wave and radiofrequency drying, electron-beam curing Radiation curable equipments, future trends.
Manufacturing of inks – Manufacturing process – mixing and milling equipments, manufacture of news inks. Handling, transportion and storage, future trends. Health and safety aspects. Ink Testing