Determination of CSP Value of Cotton Yarn by Lea Strength Tester.

Experiment No.: 03

Experiment Name: Determination of CSP Value of Cotton Yarn by 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 machine works in constant rate of extension.

Objectives:

1. To determine yarn lea strength
2. To calculate count strength product

Apparatus:

1. Cotton Yarn
2. Warp Reel
3. Lea Strength Tester
4. Calculator

Figure:

Machine Description:

• Name of the machine: MecStretchXT
• Origin: India
• Brand: MAG
• Company: Mag Solvice (pvt.) Ltd.

Feature of the Machine:

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

Working Principle:

1. At first lea cotton yarn is measured by warp reel and in this way 5 samples are taken for testing.
2. Now, the first sample is fixed with the upper jaw j1 and lower jaw j2.
3. The machine is started and observed the dial unit the sample is turn out.
4. When the sample is turn out the machine is stopped and the reading is taken.
5. By this way the others reading are taken.
6. Then all the samples are weighted and counts are calculated.
7. C.S.P of the all samples are calculated.
8. At last calculate the average C.S.P

Calculation:

For sample 01, CSP  = Yarn Strength x Yarn Count

                                  = 61 x 40

                                  = 2440

For sample 02, CSP  = Yarn Strength x Yarn Count

                                  = 61.5 x 40

                                  = 2460

For sample 03, CSP  = Yarn Strength x Yarn Count

                                  = 62 x 40

                                  = 2480

For sample 04, CSP  = Yarn Strength x Yarn Count

                                  = 62.3 x 40

                                  = 2492

For sample 05, CSP  = Yarn Strength x Yarn Count

                                  = 63 x 40

                                  = 2520

 Average CSP            =   (2440+2460+2480+2492+2520)/5

                                  = 2478.4

Table:

Observation No.:	Yarn Strength	Yarn Count (Ne)	CSP	Average CSP
01	61	40	2440	2478.2
02	61.5	40	2460
03	62	40	2480
04	62.3	40	2492
05	63	40	2520

Result:

Average C.S.P is 2478.4

Conclusion:

 In this experiment we can learn about count strength product and determine the CSP. CSP less than 1800 are week, between 1800-2200 are average and greater than 2200 are strong. Our experimental CSP is 2478.4 which is greater than the standard 2200. So this is good strength fibre.