Question
Sizing of single cotton yarn leads to an increase in
The correct answer is
Strength and bending rigidity but decrease in extensibility and hairiness
Understanding Sizing Effects on Cotton Yarn
Sizing is a process applied to warp yarns before weaving. It involves coating the yarn with a protective substance (like starch) to improve its properties for the stresses of weaving.
Impact of Sizing on Yarn Properties
Sizing significantly alters the physical characteristics of single cotton yarn:
- Strength: Increases due to the binding of fibers and smoothing of the surface.
- Bending Rigidity: Increases because the coating stiffens the yarn structure.
- Extensibility: Decreases as the yarn becomes less flexible and stretchable.
- Hairiness: Decreases because the sizing agent coats the protruding fibers, leading to a smoother yarn surface.
Therefore, sizing leads to an increase in strength and bending rigidity, coupled with a decrease in extensibility and hairiness.
This corresponds to Option B.
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Important Questions from FABR Woven Fabric Preparation Sizing
- If both the concentration (%, w/w) of size paste and target add-on are 12%, the total wet pick-up (kg) by 12 kg bone-dry warp sheet is
- The ingredient that is NOT used in sizing formulations is
- Compared to conventional sizing, the wet sizing process reduces
- For multifilament yarns, optimum add-on (%) of size is in the range
- In cotton yarn sizing, the starch primarily acts as
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