Question

The strength of a yarn is commonly expressed in terms of:

• A. Tenacity
• B. Elongation
• C. Evenness
• D. Crimp

Hint:

Always remember: {Strength = Force per unit linear density}, which is why tenacity is preferred over simple breaking force.

Answer 1

The Correct Option is A

Step 1: Understanding yarn strength.
Yarn strength refers to the ability of a yarn to withstand tensile forces without breaking. In textile testing, strength must be expressed in a standardized and comparable manner, taking yarn thickness into account.
Step 2: Meaning of tenacity.
Tenacity is defined as the breaking force per unit linear density of the yarn. It is commonly expressed in units such as grams per tex or centiNewtons per tex (cN/tex). This allows fair comparison between yarns of different thicknesses.
Step 3: Analysis of options.
(A) Tenacity: Correct — Tenacity directly represents yarn strength relative to its linear density and is the standard measure used in textile testing.
(B) Elongation: Elongation measures how much a yarn stretches before breaking, not its strength.
(C) Evenness: Evenness indicates uniformity of yarn thickness, not tensile strength.
(D) Crimp: Crimp refers to waviness in fibres or yarn and does not express strength.
Step 4: Conclusion.
Since yarn strength must account for yarn fineness, it is most accurately expressed in terms of tenacity.