Question

Spinning speeds in Man-made fibre of \(10,000\ \text{mpm}\) results in the formation of which Yarn?

• A. LOY
• B. FOY
• C. MOY
• D. POY

Hint:

Remember the sequence of filament yarns according to increasing spinning speed: \[ \boxed{ \text{LOY} \rightarrow \text{POY} \rightarrow \text{MOY} \rightarrow \text{FOY} } \] Higher spinning speed produces: \[ \begin{aligned} &\bullet\ \text{Higher molecular orientation} &\bullet\ \text{Higher tensile strength} &\bullet\ \text{Lower elongation} &\bullet\ \text{Better dimensional stability} \end{aligned} \] A common examination fact is: \[ \boxed{ 10,000\ \text{mpm} \Longrightarrow \text{FOY} } \]

Answer 1

The Correct Option is B

Concept: During the manufacture of synthetic fibres, the type of yarn produced depends largely on the spinning speed (take-up speed). As the spinning speed increases, the molecular chains become more oriented, resulting in improved strength and reduced elongation. Based on the spinning speed, man-made filament yarns are generally classified as: \[ \begin{array}{|c|c|} \hline Yarn Type & Typical Spinning Speed \hline LOY\ (\text{Low Oriented Yarn}) & \text{Low Speed} \hline POY\ (\text{Partially Oriented Yarn}) & 2500-4500\ \text{mpm} \hline MOY\ (\text{Medium Oriented Yarn}) & 4500-6000\ \text{mpm} \hline FOY\ (\text{Fully Oriented Yarn}) & 6000-10000\ \text{mpm or higher} \hline \end{array} \] Thus, very high spinning speeds produce Fully Oriented Yarn (FOY).

Step 1: Identify the given spinning speed.
The given spinning speed is \[ 10,000\ \text{mpm} \] where \[ \text{mpm}=\text{metres per minute}. \] This is a very high take-up speed used in high-speed spinning processes.

Step 2: Relate the spinning speed to the yarn type.
At such a high spinning speed,
• Molecular orientation becomes nearly complete.
• The yarn develops high tensile strength.
• The yarn requires little or no additional drawing. Therefore, the yarn produced is \[ \boxed{\text{Fully Oriented Yarn (FOY).}} \]

Step 3: Examine each option.
Option (A): LOY LOY is produced at comparatively low spinning speeds and has very low molecular orientation. \[ \boxed{\text{Incorrect}} \] Option (B): FOY FOY is produced at very high spinning speeds such as \[ 6000-10000\ \text{mpm} \] or even higher in modern spinning systems. \[ \boxed{\text{Correct}} \] Option (C): MOY MOY possesses intermediate orientation and is produced at medium spinning speeds. \[ \boxed{\text{Incorrect}} \] Option (D): POY POY is only partially oriented and is generally produced at much lower spinning speeds. \[ \boxed{\text{Incorrect}} \]

Step 4: Write the final answer.
Since the spinning speed is \[ 10,000\ \text{mpm}, \] the yarn obtained is \[ \boxed{\text{Fully Oriented Yarn (FOY).}} \] Therefore, \[ \boxed{\text{Option (B) is the correct answer.}} \]