To compare Tensile Strength and CLSP of different type of yarns having same count (20s).

Abstract:
In this experiment, different types of yarns were studied under the parameters of tensile strength and CLSP. The yarns that were studied in this experiment are 100% cotton yarns, nylon/cotton blended yarns and CVC yarns, all having 20s count. Through the lea method the tensile strength of these yarns were calculated. Results shows us that the nylon/cotton yarns has the highest strength. While the strength of CVC yarns and pure cotton yarns was less than nylon/cotton yarns.

Objectives:

• To calculate the tensile strength of 100% cotton yarns.
• To calculate the tensile strength of nylon/cotton blended yarns.
• To calculate the tensile strength of CVC yarns.
• To compare their tensile strength and CLSP.

Materials:

• 100% Cotton yarn package.
• Nylon/cotton blended yarn package. (40:60 blend)
• CVC yarn package. (60:40 blend)
• Wrapping Reel
• Lea Tensile Testing Machine.
• Weighing Balance.

Procedure:

• 100% cotton yarn package was taken.
• The package was placed on the wrapping reel.
• 5 sample leas was made of that yarn package.
• These were weighed one by one on the weighing balance.
• The tensile strength of the leas was determined one by one on the lea tensile testing machine.
• The same procedure was done for the nylon/cotton and CVC blends.

Observations & Calculations:
English Count (Ne) = 64.428 / (lea weight in grams)=20
1 Kg=2.2 lbs.
CLSP = Count × Lea Strength in lbs.
Co-officient of Variation = (S.D)/X' ×100

 
100% Cotton

Sr. #	Strength (Kg)	Strength (lbs.)	Weight (grams)	CLSP
1	38	81.4	3.17	1628
2	37	83.6	3.19	1672
3	44	96.8	3.28	1936
4	40	88	3.18	1760
5	43	94.6	3.24	1892
Mean Values	40.4	88.88	3.21	1777.6
Co-officient of Variation	7.54	7.54	1.45	7.55

 
40:60 Nylon/Cotton

Sr.#	Strength (Kg)	Strength (lbs.)	Weight (grams)	CLSP
1	61	134.2	3.27	2684
2	60	132	3.28	2640
3	65	143	3.30	2860
4	64	140.8	3.34	2816
5	64	140.8	3.29	2816
Mean Values	62.8	138.16	3.29	2763.2
Co-officient of Variation	3.45	3.45	0.82	3.45

 
60:40 CVC

Sr. #	Strength (Kg)	Strength (lbs.)	Weight (grams)	CLSP
1	63	138.6	3.26	2772
2	63	138.6	3.24	2772
3	63	138.6	3.25	2772
4	55	121	3.22	2420
5	63	138.6	3.24	2772
Mean Values	61.4	135.08	3.24	2701
Co-officient of Variation	5.82	5.82	0.45	5.82

 

 
Results:
Tensile Strength for 100% cotton yarn = 88.88 lbs.
CLSP for 100% cotton yarn = 1777.6
Tensile Strength for nylon/cotton yarn = 138.16 lbs.
CLSP for nylon/cotton yarn= 2763.2
Tensile Strength for CVC yarn = 135.08 lbs.
CLSP for CVC yarn = 2701
Discussion:
The results show us that the nylon/cotton yarns are the strongest yarns between the given yarns, while the pure cotton yarns are the weakest one. As the nylon and polyester are the synthetic fibers and they have high tensile strength properties, so when blended with cotton fibers they provide the strength to the yarns produced by them. Between nylon and polyester, nylon is stronger as it is a polyamide fiber and is also in many mechanical instruments where strength and stiffness is required and also where flame resistance is required to some extent.