Subject Code:2152907
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-V (NEW) EXAMINATION - WINTER 2018
Subject Name:Man Made Fibre Technology
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) State the unique properties of man made fibres. [03]
(b) Write briefly about the different tow to top conversion systems. [04]
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(c) Define texturising and discuss in detail about the feed material characteristics that has profound effect on properties of textured yarn. [07]
Q.2
(a) Name the techniques available for producing textured yarn and state which is the most widely used technique. [03]
(b) Mention the three routes through which the polyester and polyamide fibres can be made flame retardant. [04]
(c) Discuss the properties of spin finish and explain any one spin finish application technique with a neat sketch. [07]
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OR
(c) What is degree of setting? Explain the mechanism of permanent set. [07]
Q.3
(a) Draw the schematic diagram of false twist texturing process. [03]
(b) Explain the concept of molecular orientation and crystallinity in fibres. [04]
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(c) Explain the two important thermal transitions in a semi-crystalline polymer. [07]
OR
Q.3
(a) Which are the process variables in false twist texturing? [03]
(b) Explain why the role of molecular size and interaction is of paramount importance. [04]
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(c) Discuss in detail about the spin finishes for filament yarns. [07]
Q.4
(a) Write briefly about the spindles in the draw texturing machines. [03]
(b) Compare the sequential and simultaneous draw texturing process. [04]
(c) Write in detail about the fibres with non-circular cross-section and hollow fibres. [07]
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OR
Q.4
(a) State the main quality problems in friction twisting. [03]
(b) Write briefly about the heaters in the draw texturing machines. [04]
(c) Discuss in detail about the glass fibre and also explain its manufacturing process. [07]
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Q.5
(a) What is chemical texturising? [03]
(b) Write briefly about the gear crimping. [04]
(c) Explain the airjet texturing. [07]
OR
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Q.5
(a) Write briefly about the quality of air textured yarns. [03]
(b) What is stuffer box texturing? [04]
(c) Discuss the recent developments in the field of man made fibres. [07]
Date:04/12/2018
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Total Marks: 70
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