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2003 Course Surface Preparation - II

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Total No. of Questions : 6] [Total No. of Pages : 2 [3664] - 259 P 1351 B.E. (Printing) SURFACE PREPARATION - II (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Question Nos. 1 and 4 are compulsory. Out of remaining attempt 2 questions from Section I and 2 questions from Section II. 2) Answers 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 in detail stages in Rubber plate-making. Explain the benefits of Photopolymer over Rubber plates. [10] [8] OR a) b) Q2) a) b) Explain in detail Design specifications for Flexography. State the benefits of Flexography. [12] [6] Write notes on [6] i) Insufficient density of a negative. ii) Effect of Main exposure. Calculate % shortening and new negative length for 2.84 mm plate thickness having printed length of 50 cm. [10] OR a) b) Mention the requirements of negative for Flexo Plate. Mention the safety precaution for Flexo Plate. Q3) Explain in detail processing of 2.84 mm Flexo Plate. [8] [8] [16] OR Q6) a) b) Explain various Flexo Plate mounting techniques. Write notes on i) Measuring the Plate thickness. ii) Orientation of Photopolymer plate. [10] [6] P.T.O. SECTION - II Q4) a) b) Explain in detail processing of Digital Flexo Plate. Write notes on i) Components and Properties of PerC/Bu. ii) Checking the Wash-out Solvent. [10] [8] OR Explain in detail stages involved in optimization of a Flexo Plate. Q5) a) b) Explain in detail Chemical Etching process for Gravure. Write notes on i) Benefits of Gravure Process. ii) Image Carrier. [18] [10] [6] OR a) b) Q6) a) b) Explain in detail processing of electronic engraved Gravure cylinder.[10] [6] Write notes on i) Gravure Cells and Ink release. ii) Gravure Proofing. Explain in detail workflow from Press to Press of Gravure. Write notes on i) Benefits of Chrome in Gravure cylinder making. ii) Ballard Shell Technique. [10] [6] OR Explain in detail effect of plating variables on Gravure cylinder. [3664] - 259 -2- [16]

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