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2003 Course Surface Preparation - II

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Total No. of Questions :6] P1158 Time : 3 Hours] [Total No. of Pages 2 [3864]-302 B.E.(Printing) SURFACE PREPARATION - II (2003Course) [Max. Marks : 100 Instructions to the candidates: 1) Question Nos.1 and 5 are compulsory. Out of the remaining attempt 2 questions from section I and 2 questions from Section.II 2) Answer to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. SECTION - I Q1) a) b) Explain the properties of Rubber Flexo plate. Explain the advantages of Photopolymer plates. [10] [8] OR a) Explain in detail requirements for printing a job for Flexography. [12] b) State the features and applications of Flexography. [6] State the requirements of negative for Flexo Plate. [6] Q2) a) b) Calculate % shortening and new negative length for 2.84 mm plate thickness having printed length of 30 cm . [10] OR a) Explain the importance of Back and Main exposure in Flexo plate-making [8] b) Mention the safety precautions for processing a Flexo Plate. [8] Explain the term Plate Staggering . [8] Write notes on : [8] Q3) a) b) i) Factors affecting extensive swelling of relief. ii) Inspection of negatives for flexo plate-making. OR Describe the preparation of 3.18 mm plate thickness. [16] P.T.O. SECTION - II Q4) a) b) Explain the process involved in preparation of Digital Flexo Plate. [8] Write notes on : [8] i) Storage and Handling of Flexo Plates. ii) Wash-out Solvents. OR Explain in detail optimization of a Flexo Plate. [16] Q5) Explain in detail Etching and Electronic Engraving process for Gravure. [18] OR a) Explain in detail Gravure cylinder-making by laser engraving process.[10] b) Explain the benefits of image carrier for electronic and laser process.[8] Q6) a) Explain the importance of Nickel and Chrome in making of a Gravure cylinder. [6] b) Write notes on : [10] i) Cell structures in Gravure cylinder making. ii) Checking of a Gravure cylinder. OR Write notes on any four : [16] a) b) c) Chemistry of an Electrolyte. Temperature. Polarization Effect. d) e) Efficiency of an Electrolyte. Contaminants. zzzz [3864]-302 2

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