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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING SEMESTER 7(OLD) • EXAMINATION SUMMER 2018
Subject Code: 372302 Date: 09-May-2018
Subject Name: Extrusion Die Design
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.
4. Each question carry equal marks (14 marks)
Q.1

Define Newtonian and Non-Newtonian fluids. Explain various types of flow with example.
07

Explain various die design rules.
07
Q.2

Define land length. Explain its importance in die design.
07

Explain melt fracture and die-swell.
07
OR

Explain various methods of streamlining extrusion dies.
07
Q.3

What is the function of die adaptor? Explain various factors to be considered for adaptor design.
07

Draw a neat sketch of breaker plate, screen pack and die adaptor assembly and label different parts.
07
OR
Q.3

State functions of breaker plate and screen pack assembly. State the unit of screen size.
07

Give classification of extrusion dies with respect to direction of flow and state applications of each.
07
Q.4

Draw any one type of blown film die and label different parts.
07

Compare side fed and centre fed dies. Give examples of each type of die.
07
OR
Q.4

Explain construction of wire coating die.
07

State and explain various die construction materials.
07
Q.5

Explain various features of fish tail die with neat sketch.
07

State functions of sizing calibrators. State and explain types of sizing calibrators.
07
OR
Q.5

Draw sheet die and label different part. Explain functions of each individual part.
14