GTU BE 6th Semester 2163602 Compounding and Processing of Plastics and Rubbers Summer 2018 Question Paper

Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE – SEMESTER ?VI (NEW) – EXAMINATION ? SUMMER 2018
Subject Code: 2163602 Date: 05/05/2018
Subject Name: Compounding & Processing of Plastics & Rubbers
Time: 10:30 AM to 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Write advantages of hot runner injection moulding for plastics. 03 (b) Explain in brief the compounding and its importance in rubber industry. 04 (c) Describe the process of plastic material injection moulding with neat figure. 07
Q.2 (a) Write advantages and disadvantages of single screw extruder.
03 (b)Write the causes and remedies of short shot and sink marks defects that occur in
injection moulded product.
04
(c) Explain extrusion blow moulding technique in detail with neat figure. 07
OR (c) Describe in detail injection blow moulding technique with the neat figure. 07
Q.3 (a) Write the meaning of breathing step and its importance in compression moulding.
03
(b) Explain plunger transfer moulding in detail with neat sketch. 04
(c) Explain in detail manufacturing of rubber tube for automobiles with neat sketch. 07
OR
Q.3 (a) Write in brief about cold feed extrusion process. 03 (b) Explain in brief about Water assisted injection moulding along with its advantages. 04 (c) Explain in detail the process of thermoforming with neat figure. 07
Q.4 (a) Compare compression moulding with transfer moulding.
03
(b) Explain in detail the cycle time of injection moulding. 04 (c)What do you mean by calendaring? Explain in detail any two types of calendaring
process with proper diagram.
07
OR
Q.4 (a) Write the importance of fillers in compounding. 03 (b) Explain in detail the function of antioxidants in plastic materials. 04 (c)Explain Reaction Injection moulding in detail with neat figure. Write its advantages
and precautions during process.
07
Q.5 (a)Write in brief about Flame Retardants. 03
(b) Explain in brief the Filament winding technique. Write its advantages. 04 (c)Explain Hand layup technique in detail with neat figure. Write its advantages and
limitations.
07
OR
Q.5 (a) What do you mean by Reinforcement? Write its importance in polymer composites. 03 (b) Write in brief about the types of calendar roll arrangements with neat sketches. 04 (c) Explain rubber injection moulding in detail with neat figure. 07
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