Man Made Fibre Technology — Winter 2018

State the unique properties of man made fibres.

Write briefly about the different tow to top conversion systems.

Define texturising and discuss in detail about the feed material characteristics that has profound effect on properties of textured yarn.

Name the techniques available for producing textured yarn and state which is the most widely used technique.

Mention the three routes through which the polyester and polyamide fibres can be made flame retardant.

Discuss the properties of spin finish and explain any one spin finish application technique with a neat sketch.

What is degree of setting? Explain the mechanism of permanent set.

Draw the schematic diagram of false twist texturing process.

Explain the concept of molecular orientation and crystallinity in fibres.

Explain the two important thermal transitions in a semi-crystalline polymer.

Which are the process variables in false twist texturing?

Explain why the role of molecular size and interaction is of paramount importance.

Discuss in detail about the spin finishes for filament yarns.

Write briefly about the spindles in the draw texturing machines.

Compare the sequential and simultaneous draw texturing process.

Write in detail about the fibres with non-circular cross-section and hollow fibres.

State the main quality problems in friction twisting.

Write briefly about the heaters in the draw texturing machines.

Discuss in detail about the glass fibre and also explain its manufacturing process.

What is chemical texturising?

Write briefly about the gear crimping.

Explain the airjet texturing.

Write briefly about the quality of air textured yarns.

What is stuffer box texturing?

Discuss the recent developments in the field of man made fibres.