Principles of Textile Processes — Summer 2021

Explain the term Spinnability.

What are the reasons of end breaks at ring frame? Explain the retardation of shuttle with hinged swell, along with necessary

diagrams.

Explain the term fractionation efficiency Calculate the traveler speed from the following data.

Spindle speed = 14000 rpm, Bobbin diameter = 22 mm, Front roll rpm = 172, Front roll diameter = 1 inch, Ring diameter = 42 mm.

Discuss factors affecting cleaning efficiency of blow room.

Derive an equation of yarn tension at any radius ‘r’.

Explain the term Draft constant.

Discuss the Optimisation of yarn content on ring spun package.

Derive an equation to calculate drafting force.

Explain the importance of size pick up.

What are the reasons of end breaks at open end spinning? Explain short term and long term variation taking place during unwinding of yarn

from ring bobbin with suitable diagram. Also discuss the various factors affecting the unwinding tension.

what are the limitations of negative let off If a loom has reed space of 1.40 mts, the average velocity of shuttle is 12.8

mts/ses, shuttle enters the shed at 850 of crank and leaves at 2150, and the length of shuttle is 26 mm, Calculate maximum loom speed. Derive the formula for friction forces in negative let off motion also discuss design

of let off mechanism.

Explain ‘Alacrity’ with respect to picking mechanism.

Discuss interrelationship between shedding and beat up briefly.

Discuss briefly effect of l/r ratio on type of movement to sley.

Explain the term kinematics for sley.

State the types of stretch in sizing and factors affecting it.

Derive equation of winding tension (Tw) in a spinning balloon zone.

Explain the importance of sley velocity

Explain the theory of propulsion in air jet loom Derive an equation for sley velocity with necessary assumptions and draw the

curve.