Subject Code: 2162308
GUJARAT TECHNOLOGICAL UNIVERSITY
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SEMESTER-VI(NEW) — EXAMINATION — SUMMER 2019
Subject Name: Advance Plastics Processing
Time: 10:30 AM TO 01:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Which are the advantages and limitations of RIM process? [03]
(b) Explain calendar roll arrangement with diagram. [04]
(c) Explain the process steps of Reaction Injection molding Technique. [07]
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Q.2 (a) What is open cell and closed cell foam? Discuss. [03]
(b) Differentiate between extrusion blow molding and injection blow molding techniques. [04]
(c) Write a note on: Parison Programming. [07]
OR
(c) Write a note on: Electroplating. [07]
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Q.3 (a) Define: K factor, Nip gap, Cellular Plastics. [03]
(b) What is Color concentrates for thermoplastics? Discuss. [04]
(c) What is structural foam molding? Give advantages and limitations of structural foam molding. [07]
OR
Q.3 (a) Discuss flexographic printing process for plastic film. [03]
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(b) Explain encapsulation process and give its applications. [04]
(c) With neat diagram explain calendaring process -along with its applications. [07]
Q.4 (a) What is the function of blowing agent? Discuss various blowing agents used in foam. [03]
(b) Explain Hot foil stamping process along with its applications. [04]
(c) Explain the vacuum metalizing process with a neat sketch along with its applications. [07]
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OR
Q.4 (a) Explain In-mold decoration technique for plastics. [03]
(b) Discuss (i) Cellular PE foam (ii) Crosslinked PE (XLPE) foam. [04]
(c) How PU foam is prepared? Explain its process and give its applications. [07]
Q.5 (a) Give any three molding defect, causes and remedies for Calendaring process. [03]
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(b) Explain the steps in rotational molding process. [04]
(c) What is Casting? List various Plastic materials that can be cast. Explain PMMA sheet preparation by casting. [07]
OR
Q.5 (a) List various heating systems for Calendar rolls. Explain any one heating system for calendar rolls. [03]
(b) List various printing techniques on Plastics. Explain Rotogravure printing process for plastic films. [04]
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(c) Explain (1) Fluidized bed and (ii) Electrostatic fluidized coating technique. [07]
Date: 16/05/2019
Total Marks: 70
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