Relation Between Yarn Count and Diameter & count calculation for ply yarn
Md Sohanur Rahman Sobuj
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Relation Between Yarn Count and Diameter & count calculation for ply yarn :
Count calculation for ply yarn :
We can make a plied yarn by twisting two single yarns together. The resultant yarn count is calculated as follows:
Expression of Resultant Count:
→Resultant count of indirect system= Number of plies/Count of single yarn Or Count of single yarn/Number of plies
→Resultant count of direct system= Count of single yarn × Number of plies Or Resultant count(count of ply or 3,4….yarn)/Number of plies
For example,
❶ 2/24s cotton count: This indicates a yarn made from two 24s cotton count yarns twisted together.
❷ 80 Tex x 2: This indicates a yarn made from twisting together two 80 Tex yarns. This type of designation is generally used with woolen yarns.
❸ R 74 Tex/2: This indicates a yarn made from twisting two yarns together whose resultant count is 74 Tex. This type of designation is generally used with worsted yarns.
Math: A two ply yarn in Tex is composed of one thread 40 Tex, one thread unknown count and has a resultant count of 100 Tex. What is the count of the other component yarn?
Soln: We know that
Math: A resultant two ply yarn count of 16 worsted has one component yarn of 36 worsted. What is the count of the other component?
Soln: We know that
Math: A three ply yarn is composed of one thread of 56 worsted, one thread of 48 worsted and one thread of 2/80 cotton. What is the count of resultant yarn?
Soln:
Count calculation for ply yarn with contraction:
Normally, when two single yarns are twisted together one should expect some contraction or some increase in length depending on the twisting direction. A contraction will result in a yarn slightly coarser than the estimated value. In order to correct for this difference, typically 5% to 10% contraction or extension should be accounted for.
Math: Suppose two yarns of 24/1 Nm are going to be plied with 4% contraction. Find its resultant count in metric system.
Math: Suppose you are provided a cotton yarn of 1500 km of 2/24s found at completely dry condition. Calculate the resultant count in Tex at standard atmospheric condition with 7% contraction.
Relation Between Yarn Count and Diameter :
Before considering cloth setting formulae it is important to fully understand the relationship between the count of a yarn and its diameter (or thickness). If the diameter is increased or decreased then the yarn count is changed.
(9080)
Md Sohanur Rahman Sobuj
Latest posts by Md Sohanur Rahman Sobuj (see all)
- Thermal Properties of Polymers - April 26, 2019
- Frictional Properties - September 15, 2018
- Torsional Properties of Textile Materials - August 30, 2018
