This document is a lab report submitted by 7 students to their lecturer for an assignment on measuring twist per inch of yarn. It describes an experiment conducted using a yarn twist tester machine to measure the twist of a 10-inch cotton yarn sample. The report details the objectives, apparatus used, working principle, calculations, and results which found that the yarn had 11 twists per inch. It concludes that measuring twist per inch helps determine yarn strength, direction, fiber fitness, and thickness.

1. BGMEA University of Fashion & Technology
Course Name: Testing of Textiles
Course Code : Tex 2104
Subject: Assignment Submission on Measurement of Twist per inch.
Submitted to
Md. Ramij Howlader
Lecturer
Department of Textile Engineering
BUFT.
Submitted By
Id No. Name
131-107-0-145 Tofail Haque
131-108-0-145 Syed Khalid Mahmud
131-109-0-145 Saidur Rahman
131-110-0-145 Touhid Alam
131-111-0-145 Ulfat Jahan Purobi
131-112-0-145 Md.Sajjadul Karim Bhuiyan
131-114-0-145 Shakib Siddique

2. Testing of Textiles (Lab)
Experiment No. 03
Experiment Name: Study on measurementof twist per inch.
Introduction: Twist is the spiral arrangementof the fibers around the axis of
the yarn. The twistbinds the fibers together and also contributes to the strength
of the yarn. The amount of twist inserted in a yarn defines the appearance and
the strength of the yarn. The number of twists is referred to as turns per inch.

3. Types of Twist:
 S -Twist
 Z –Twist
Objectives:
 Contribute to the strength of the yarn.
 To calculate the number of twists in an inch of yarn.
 The amount of twist in a yarn helps to define the style of yarn.
 To find the quality of fibers used.
 To measurethe fitness of the fiber being spun.
Apparatus:
1. Cotton Yarn
2. Yarn TwistTester
Figure of the Machine with parts Identification:

4. WorkingPrinciple: (Principle of Untwist and Re-twist)
 At least 15inches of yarn fromyarn packageshould be left out fromthe
free end.
 Yarn Size=10” is clamped at screw .
 Rotate the handle manually, which is turn rotate the revolution counter.
 When the fiber is fully untwisted, the counter light will be off automatically.
 The measurement of revolution in the revolution meter result should be
noted.
Calculation:
Twist of yarn (10”) =110
Twist per inch yarn=
110
10
=11
Result:
By Calculating via yarn twist tester machine, the measurement of twistper inch
Is=11/inch yarn.
Conclusion:
As per above discussion, wecan say that measurement of twistper inch used to
determine the strength of yarn, define the direction of yarn, fitness of fiber being
spun and thickness or coarseness of yarn.