GTU BE 5th Semester 152301 Injection Moulding Technologies Summer 2018 Question Paper

1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE – SEMESTER ?V (OLD) – EXAMINATION ? SUMMER 2018
Subject Code:152301 Date:04/05/2018
Subject Name:Injection Moulding Technologies
Time:02:30 PM to 05:00 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) Explain start up and shut-down process for injection molding process. 07
(b) What are the advantages & disadvantages of Injection moulding 07

Q.2 (a) Differentiate between Hydraulic and Toggle clamping systems. 07
(b) Compare between Hydraulic & Electrical drives. 07
OR
(b) Describe Gas assisted Injection Moulding process and its applications 07

Q.3 (a) Write down causes & remedies for : (i) Weld line (ii) Sink marks
07
(b) Describe Reaction Injection Moulding process and its applications 07
OR
Q.3 (a) Write down causes & remedies for : (i) Warpage (ii) Burn marks
07
(b) Explain Standard nozzle and Needle type shut off nozzle. 07

Q.4 (a) What is single stage plunger machine? Explain it. 07
(b) With the help of graph explain Injection cycle. 07
OR
Q.4 (a) What is nitriding? Explain nitriding process on injection molding machine part. 07
(b) Explain about maintenance of Injection molding. 07

Q.5 (a) Explain PVT diagram in Injection Moulding 07
(b) Explain cavity pressure profile in Injection Molding. 07
OR
Q.5 (a) Explain melting of plastic on screw. 07
(b) Explain about Injection molding of Thermoset. 07
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