BGMEA University of Fashion & TechnologyCourse Name: Testing of TextilesCourse Code : Tex 2104

Subject: Assignment Submission on yarn lea strength tester.

Submitted toMd. Ramij Howlader

Lecturer Department of Textile Engineering

BUFT.

Submitted By

Id No. Name131-107-0-145 Tafail Haque131-108-0-145 Syed Khalid Mahmud131-109-0-145 Saidur Rahman131-110-0-145 Touhid Alam131-111-0-145 Ulfat Jahan Purobi131-112-0-145 Md.Sajjadul Karim Bhuiyan131-114-0-145 Shakib Siddique

Testing of Textiles (Lab)Experiment No. 02Experiment Name: Study on Yarn Lea strength tester.

Introduction: A lea strength tester measures the strength of one lea yarn. One lea means 120 yards. Strength is a measure of the steady force necessary to break a material and is measured in pound. The m/c works in constant rate of extension.

Objectives: To determine yarn lea strength. To calculate the count strength product.

Apparatus:1. Cotton Yarn2. Warp reel3. Lea strength tester4. Calculator

Machine Figure:

Machine Description: Name Of the Machine : MecStretch XT Origin: India Brand: MAG Company: Mag Solvics (Pvt.) Ltd. Features of the Machine :

1. Accurate determination of strength of lea skein.2. Vertical type accommodates easily on wall.3. Constant rate of extension principle.4. Strength measurement up to 300lbs to 0.3readability.

Working Principle: (Constant Rate of Extension)

At first one lea cotton yarn is measured by wrap reel. Now, the first sample is fixed with the upper jaw J1 and the lower jaw

J2.

The m/c is started and observed the dial until the sample is torn out. When the sample is torn out the m/c is stopped and the reading is

taken.

Calculation:

Lea Strength = 79.32lbs/lea [120yards = 1lea]

C.S.P (Count Strength product) = Lea strength × Yarn Count

=79.32×30

=2379.6 (C.S.P of given sample)

Result:

The strength of Cotton yarn = 79.32lbs/lea.

The Count Strength product (C.S.P) = 2379.6

Limitation :

All the Yarn doesn’t break at the same time.

Remark:

It is considered that fibers having C.S.P less than 1800 are bad or weak, between 1800-2200 are average and greater than 2200 are strong. From our experiment we see that our samples’ average C.S.P is 2379.6 which is greater than the standard 2200. So finally we can say that these yarns have good strength fibers.