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2003 Course Rubber Technology (Elective)

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Total No. of Questions :12] P1314 [Total No. of Pages :3 [3864]-386 B.E. (Polymer) RUBBER TECHNOLOGY (Elective) (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) 5) 6) Answer any three questions from each section. Answers to the two sections should be written in separate books. Neat diagrams must be drawn wherever necessary. Figures to the right indicate full marks. Use of logarithmic tables, slide rule, Mollier charts electronic pocket calculator and steam tables is allowed. Assume suitable data, if necessary. SECTION - I Q1) Define Compounding. List various ingredients used in rubber compounding. Give the role of each ingredient with suitable examples. [16] OR Q2) Show the various steps in dry rubber technology with the help of a block diagram. Explain coagulation, pale crepe, smobed sheet and mastication in detail. [16] Q3) What is vulcanisation? Explain the process of vulcanisation giving chemical reactions of at least 3 commercial elastomer materials. [16] OR Q4) List the factors affecting the process of vulcanisation. Discuss in detail various techniques of vulcanisation. [16] Q5) Answer the following: a) b) c) List the molecular criteria for a material to behave as an elastomer. [4] Classify rubber materials in suitable groups. [3] List the changes in the rubber material after vulcanisation. [4] P.T.O. d) What are different selection criteria of rubber materials. [3] e) Justify the statement: Rubber elasticity is entropy driven. [4] OR Q6) Draw neat labelled diagrams of: a) Stress-strain curve of elastomers and explain long range elasticity. [9] b) Cure curve for S vulcanisation and explain scorch and reversion . [9] SECTION - II Q7) a) b) c) List the different types of roll arrangements used in calendaring. Explain roll chambering. [6] Explain the process of injection molding of rubbers. [6] List the different types of extruders used with rubbers. Explain the different methods of vulcanisation of extrudates. [6] OR Q8) a) Explain the process of compression molding of rubbers. Which rubber articles are manufactured by this method? What are the advantages of compression molding? [6] b) What is roll-bending in calendaring process? What are the remedies to over come the same? [6] c) What are the advantages and disadvantages of injection molding as compared to compression molding in rubbers? [6] Q9) a) List the various components forming a tyre structure and explain the function of each component. List the rubbers used in tyre manufacture. [6] b) Explain the process for manufacture of cables. How are cables cured ? [5] c) With the help of a neat sketch list the various constructional elements of a cable slating the function of each element. [5] [3864]-386 -2- OR Q10) a) With a neat sketch explain the constructional elements of a rubber hose. What is the criteria for selection of material for hoses? [6] b) State the 3 different types of latex dipping processes. Explain the process of coagulant dipping used for rubber gloves. [5] c) Explain the construction, manufacture of a conveyer belt. What are its applications? [5] Q11) a) List the tests carried out on unvulcanised rubbers. Explain any 2 indetail. [8] b) Define fatigue . List the 2 types of tests to find fatigue in a rubber sample. Explain any one of there. [8] OR Q12) a) State 2 applications in which the rubber product is tested for abrasion. Explain the procedure to carry out the test. [8] b) List the electrical tests carried out on rubbers. Explain surface and volume resistivity w.r.t. rubbers. [8] nnn [3864]-386 -3-

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